mtmd_cpp.py

from __future__ import annotations

import enum
import os
from ctypes import (
    c_bool,
    c_char_p,
    c_int,
    c_uint,
    c_uint8,
    c_int32,
    c_uint32,
    c_int64,
    c_float,
    c_void_p,
    c_size_t,
    POINTER,
    _Pointer,  # type: ignore
    Structure,
    CFUNCTYPE
)
import pathlib
from typing import (
    Union,
    NewType,
    Optional,
    TYPE_CHECKING,
)

import llama_cpp.llama_cpp as llama_cpp_lib

from llama_cpp._ctypes_extensions import (
    load_shared_library,
    ctypes_function_for_shared_library,
)

from llama_cpp._ggml import (
    ggml_backend_sched_eval_callback,
    ggml_log_callback,
)

if TYPE_CHECKING:
    from llama_cpp._ctypes_extensions import (
        CtypesArray,
    )


# --- mtmd library loading ---
_libmtmd_base_name = "mtmd"
_libmtmd_override_path = os.environ.get("MTMD_CPP_LIB")
_libmtmd_base_path = pathlib.Path(os.path.abspath(os.path.dirname(__file__))) / "lib" if _libmtmd_override_path is None else pathlib.Path(_libmtmd_override_path).parent

# Load the mtmd library
_libmtmd = load_shared_library(_libmtmd_base_name, _libmtmd_base_path)
ctypes_function_mtmd = ctypes_function_for_shared_library(_libmtmd)


################################################
# mtmd.h
# /**
#  * libmtmd: A library for multimodal support in llama.cpp.
#  *
#  * WARNING: This API is experimental and subject to many BREAKING CHANGES.
#  *          Issues related to API usage may receive lower priority support.
#  *
#  * For the usage, see an example in mtmd-cli.cpp
#  */
################################################


# enum mtmd_input_chunk_type {
#     MTMD_INPUT_CHUNK_TYPE_TEXT,
#     MTMD_INPUT_CHUNK_TYPE_IMAGE,
#     MTMD_INPUT_CHUNK_TYPE_AUDIO,
#     MTMD_INPUT_CHUNK_TYPE_COUNT, // for validation
# };
class mtmd_input_chunk_type(enum.IntEnum):
    MTMD_INPUT_CHUNK_TYPE_TEXT  = 0
    MTMD_INPUT_CHUNK_TYPE_IMAGE = 1
    MTMD_INPUT_CHUNK_TYPE_AUDIO = 2
    MTMD_INPUT_CHUNK_TYPE_COUNT = 3


class mtmd_video_template(enum.IntEnum):
    """Native video frame/timestamp layout, including optional Omni soundtrack."""

    MTMD_VIDEO_TEMPLATE_DEFAULT = 0
    MTMD_VIDEO_TEMPLATE_LFM3 = 1
    MTMD_VIDEO_TEMPLATE_LFM3_OMNI = 2
    MTMD_VIDEO_TEMPLATE_QWEN3VL = 3

# // position indexing for decoder model
# enum mtmd_pos_type {
#     MTMD_POS_TYPE_NORMAL,    // number of positions equals to number of tokens
#     MTMD_POS_TYPE_MROPE,     // qwen-vl mrope style, each image takes max(t,h,w) position indexes
#     MTMD_POS_TYPE_HUNYUANVL, // HunyuanVL mrope + BOI/EOI/newline layout with XD-RoPE dim-3
#     MTMD_POS_TYPE_COUNT,     // for validation
# };
class mtmd_pos_type(enum.IntEnum):
    MTMD_POS_TYPE_NORMAL    = 0  # number of positions equals to number of tokens
    MTMD_POS_TYPE_MROPE     = 1  # qwen-vl mrope style, each image takes max(t,h,w) position indexes
    MTMD_POS_TYPE_HUNYUANVL = 2  # HunyuanVL mrope + BOI/EOI/newline layout with XD-RoPE dim-3
    MTMD_POS_TYPE_COUNT     = 3  # for validation

# // opaque types

# struct mtmd_context;
mtmd_context_p = NewType("mtmd_context_p", int)
mtmd_context_p_ctypes = c_void_p

# // represents raw image data, layout is RGBRGBRGB...
# // length of data must be nx * ny * 3
# struct mtmd_bitmap {
#     uint32_t nx;
#     uint32_t ny;
#     std::vector<unsigned char> data;
#     std::string id; // optional user-defined id, for ex: can be set to image hash, useful for KV cache tracking
#     bool is_audio = false; // true if the bitmap is audio
# };
mtmd_bitmap_p = NewType("mtmd_bitmap_p", int)
mtmd_bitmap_p_ctypes = c_void_p

# struct mtmd_image_tokens {
#     uint32_t nx; // number of tokens in x direction
#     uint32_t ny; // number of tokens in y direction
#     mtmd_pos_type pos = MTMD_POS_TYPE_NORMAL;
#     uint32_t n_tokens() const { return nx * ny; }
#     clip_image_f32_batch batch_f32; // preprocessed image patches
#     std::string id; // optional user-defined ID, useful for KV cache tracking
#     mtmd_image_tokens clone() {
#         return mtmd_image_tokens{
#             nx,
#             ny,
#             use_mrope_pos,
#             batch_f32.clone(),
#             id
#         };
#     }
# };
mtmd_image_tokens_p = NewType("mtmd_image_tokens_p", int)
mtmd_image_tokens_p_ctypes = c_void_p

# struct mtmd_audio_tokens {
#     uint32_t n_tokens; // number of tokens
#     clip_image_f32_batch batch_f32; // preprocessed image patches
#     std::string id; // optional user-defined ID, useful for KV cache tracking
#     mtmd_audio_tokens clone() {
#         return mtmd_audio_tokens{
#             n_tokens,
#             batch_f32.clone(),
#             id
#         };
#     }
# };
mtmd_audio_tokens_p = NewType("mtmd_audio_tokens_p", int)
mtmd_audio_tokens_p_ctypes = c_void_p

# struct mtmd_input_chunk {
#     mtmd_input_chunk_type type;
#     std::vector<llama_token> tokens_text;
#     mtmd_image_tokens_ptr tokens_image;
#     mtmd_audio_tokens_ptr tokens_audio;
# };
mtmd_input_chunk_p = NewType("mtmd_input_chunk_p", int)
mtmd_input_chunk_p_ctypes = c_void_p

# struct mtmd_input_chunks;
mtmd_input_chunks_p = NewType("mtmd_input_chunks_p", int)
mtmd_input_chunks_p_ctypes = c_void_p

# struct mtmd_batch {
#     mtmd_context * ctx;
#     std::vector<const mtmd_input_chunk *> entries;
#     std::vector<float> output_embd; // aggregated output embedding for the whole batch
#     mtmd_batch(mtmd_context * ctx): ctx(ctx) {}
#     int32_t n_tokens() const {
#         int32_t n = 0;
#         for (const auto * chunk : entries) {
#             n += mtmd_input_chunk_get_n_tokens(chunk);
#         }
#         return n;
#     }
# };
mtmd_batch_p = NewType("mtmd_batch_p", int)
mtmd_batch_p_ctypes = c_void_p

# struct mtmd_gen_state;
mtmd_gen_state_p = NewType("mtmd_gen_state_p", int)
mtmd_gen_state_p_ctypes = c_void_p

# typedef bool (*mtmd_progress_callback)(float progress, void * user_data);
mtmd_progress_callback = CFUNCTYPE(
    c_bool,
    c_float,                  # progress
    c_void_p,                 # user_data
)

# struct mtmd_input_text {
#     const char * text;
#     size_t text_len;
#     bool add_special;
#     bool parse_special;
# };
class mtmd_input_text(Structure):
    _fields_ = [
        ("text", c_char_p),
        ("text_len", c_size_t),
        ("add_special", c_bool),
        ("parse_special", c_bool),
    ]
mtmd_input_text_p = NewType("mtmd_input_text_p", int)
mtmd_input_text_p_ctypes = POINTER(mtmd_input_text)

# struct mtmd_input_part {
#     // only text or bitmap can be set, not both
#     const struct mtmd_input_text * text;
#     const struct mtmd_bitmap * bitmap;
# };
class mtmd_input_part(Structure):
    _fields_ = [
        ("text", mtmd_input_text_p_ctypes),
        ("bitmap", mtmd_bitmap_p_ctypes),
    ]

mtmd_input_part_p = NewType("mtmd_input_part_p", int)
mtmd_input_part_p_ctypes = POINTER(mtmd_input_part)

# enum clip_flash_attn_type {
#     CLIP_FLASH_ATTN_TYPE_AUTO     = -1,
#     CLIP_FLASH_ATTN_TYPE_DISABLED = 0,
#     CLIP_FLASH_ATTN_TYPE_ENABLED  = 1,
# };
class clip_flash_attn_type (enum.IntEnum):
    CLIP_FLASH_ATTN_TYPE_AUTO = -1
    CLIP_FLASH_ATTN_TYPE_DISABLED = 0
    CLIP_FLASH_ATTN_TYPE_ENABLED = 1

# struct clip_context_params {
#     bool use_gpu;
#     ggml_backend_dev_t device;
#     enum clip_flash_attn_type flash_attn_type;
#     int image_min_tokens;
#     int image_max_tokens;
#     bool warmup;
#     ggml_backend_sched_eval_callback cb_eval;
#     void * cb_eval_user_data;
#     bool no_alloc;
#     mtmd_progress_callback progress_callback;
#     void * progress_callback_user_data;
# };
class clip_context_params(Structure):
    _fields_ = [
        ("use_gpu", c_bool),
        ("device", c_void_p),
        ("flash_attn_type", c_int),
        ("image_min_tokens", c_int),
        ("image_max_tokens", c_int),
        ("warmup", c_bool),
        ("cb_eval", ggml_backend_sched_eval_callback),
        ("cb_eval_user_data", c_void_p),
        ("no_alloc", c_bool),
        ("progress_callback", mtmd_progress_callback),
        ("progress_callback_user_data", c_void_p),
    ]

# struct mtmd_context_params {
#     bool use_gpu;
#     ggml_backend_dev_t device;
#     bool print_timings;
#     int n_threads;
#     const char * image_marker; // deprecated, use media_marker instead
#     const char * media_marker;
#     enum llama_flash_attn_type flash_attn_type;
#     bool warmup; // whether to run a warmup encode pass after initialization

#     // limit number of image tokens, only for vision models with dynamic resolution
#     int image_min_tokens; // minimum number of tokens for image input (default: read from metadata)
#     int image_max_tokens; // maximum number of tokens for image input (default: read from metadata)

#     // callback function passed over to mtmd proper
#     ggml_backend_sched_eval_callback cb_eval;
#     void * cb_eval_user_data;

#     // batching params
#     int32_t batch_max_tokens; // maximum number of output tokens in a batch
#                               // (note: this is not a hard-limit, the first image will always be added even if it exceeds this limit)
#                               // (default: 1024)

#     // Called with a progress value between 0.0 and 1.0. Pass NULL to disable.
#     // If the provided progress_callback returns true, model loading continues.
#     // If it returns false, model loading is immediately aborted.
#     mtmd_progress_callback progress_callback;
#     void * progress_callback_user_data;
# };
class mtmd_context_params(Structure):
    _fields_ = [
        ("use_gpu", c_bool),
        ("device", c_void_p),
        ("print_timings", c_bool),
        ("n_threads", c_int),
        ("image_marker", c_char_p),
        ("media_marker", c_char_p),
        ("flash_attn_type", c_int),
        ("warmup", c_bool),
        ("image_min_tokens", c_int),
        ("image_max_tokens", c_int),
        ("cb_eval", ggml_backend_sched_eval_callback),
        ("cb_eval_user_data", c_void_p),
        ("batch_max_tokens", c_int32),
        ("progress_callback", mtmd_progress_callback),
        ("progress_callback_user_data", c_void_p)
    ]

mtmd_context_params_p_ctypes = POINTER(mtmd_context_params)

# MTMD_API const char * mtmd_default_marker(void);
@ctypes_function_mtmd(
    "mtmd_default_marker",
    [],
    c_char_p,
)
def mtmd_default_marker() -> c_char_p:
    ...


# MTMD_API struct mtmd_context_params mtmd_context_params_default(void);
@ctypes_function_mtmd(
    "mtmd_context_params_default",
    [],
    mtmd_context_params,
)
def mtmd_context_params_default() -> mtmd_context_params:
    ...


# // initialize the mtmd context
# // return nullptr on failure
# MTMD_API mtmd_context * mtmd_init_from_file(const char * mmproj_fname,
#                                             const struct llama_model * text_model,
#                                             const struct mtmd_context_params ctx_params);
@ctypes_function_mtmd(
    "mtmd_init_from_file", [
        c_char_p,
        llama_cpp_lib.llama_model_p_ctypes,
        mtmd_context_params,
    ],
    mtmd_context_p_ctypes,
)
def mtmd_init_from_file(
    mmproj_fname: c_char_p,
    text_model: llama_cpp_lib.llama_model_p,
    ctx_params: mtmd_context_params,
    /,
) -> mtmd_context_p:
    """
    initialize the mtmd context
    return nullptr on failure
    """
    ...


# MTMD_API void mtmd_free(mtmd_context * ctx);
@ctypes_function_mtmd("mtmd_free", [mtmd_context_p_ctypes], None)
def mtmd_free(ctx: mtmd_context_p):
    ...

# // whether we need to set non-causal mask before llama_decode
# // if chunk is nullptr, we assume the default case where chunk is an image chunk
# MTMD_API bool mtmd_decode_use_non_causal(const mtmd_context * ctx, const mtmd_input_chunk * chunk);
@ctypes_function_mtmd(
    "mtmd_decode_use_non_causal", [mtmd_context_p_ctypes, mtmd_input_chunk_p_ctypes], c_bool)
def mtmd_decode_use_non_causal(ctx: mtmd_context_p, chunk: mtmd_input_chunk_p) -> c_bool:
    ...

# // whether the current model use M-RoPE for llama_decode
# MTMD_API bool mtmd_decode_use_mrope(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_decode_use_mrope", [mtmd_context_p_ctypes], c_bool)
def mtmd_decode_use_mrope(ctx: mtmd_context_p) -> c_bool:
    ...

# // whether the current model supports vision input
# MTMD_API bool mtmd_support_vision(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_support_vision", [mtmd_context_p_ctypes], c_bool)
def mtmd_support_vision(ctx: mtmd_context_p) -> c_bool:
    ...

# // whether the current model supports audio input
# MTMD_API bool mtmd_support_audio(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_support_audio", [mtmd_context_p_ctypes], c_bool)
def mtmd_support_audio(ctx: mtmd_context_p) -> c_bool:
    ...

# // get audio sample rate in Hz, for example 16000 for Whisper
# // return -1 if audio is not supported
# MTMD_API int mtmd_get_audio_sample_rate(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_get_audio_sample_rate", [mtmd_context_p_ctypes], c_int)
def mtmd_get_audio_sample_rate(ctx: mtmd_context_p) -> c_int:
    """
    get audio sample rate in Hz, for example 16000 for Whisper
    return -1 if audio is not supported
    """
    ...

class mtmd_video_config(Structure):
    """Model-recommended video sampling; zero fields leave caller defaults."""

    _fields_ = [
        ("tmpl", c_int),
        ("fps", c_float),
        ("n_frames", c_int32),
        ("frame_width", c_int32),
        ("frame_height", c_int32),
    ]

    if TYPE_CHECKING:
        tmpl: int
        fps: float
        n_frames: int
        frame_width: int
        frame_height: int


# MTMD_API struct mtmd_video_config mtmd_get_video_config(const mtmd_context * ctx, int32_t src_width, int32_t src_height, int32_t src_n_frames, float src_fps);
@ctypes_function_mtmd(
    "mtmd_get_video_config", [mtmd_context_p_ctypes, c_int32, c_int32, c_int32, c_float],
    mtmd_video_config,
)
def mtmd_get_video_config(
    ctx: mtmd_context_p, src_width: int, src_height: int,
    src_n_frames: int, src_fps: float,
) -> mtmd_video_config:
    """Return recommended sampling/layout; source count and FPS may be unknown (<=0)."""
    ...


# // get the current marker string
# MTMD_API const char * mtmd_get_marker(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_get_marker", [mtmd_context_p_ctypes], c_char_p)
def mtmd_get_marker(ctx: mtmd_context_p) -> c_char_p:
    """
    get the current marker string
    """
    ...

# // mtmd_bitmap
# //
# // if bitmap is image:
# //     length of data must be nx * ny * 3
# //     the data is in RGBRGBRGB... format
# //     note: some video-capable models (i.e. qwen-vl) can merge consecutive bitmaps
# //           into one chunk; mtmd_tokenize() handles this, but remember to set
# //           mtmd_bitmap_set_mergeable(true) and mtmd_bitmap_set_is_video(true) for every frame
# // if bitmap is audio:
# //     length of data must be n_samples * sizeof(float)
# //     the data is in float format (PCM F32)
# //
# // if data == nullptr:
# //     the bitmap is considered "empty", and will be treated as a placeholder for counting tokens
# //     you can pass the bitmap via mtmd_tokenize(), then call mtmd_*_get_n_tokens() to count the tokens
# //     note: passing a placeholder bitmap to mtmd_encode() will return an error
# MTMD_API mtmd_bitmap *         mtmd_bitmap_init           (uint32_t nx, uint32_t ny, const unsigned char * data);
@ctypes_function_mtmd(
    "mtmd_bitmap_init", [
        c_uint32,
        c_uint32,
        POINTER(c_uint8),
    ],
    mtmd_bitmap_p_ctypes,
)
def mtmd_bitmap_init(
    nx: c_uint32,
    ny: c_uint32,
    data: POINTER(c_uint8), # type: ignore
    /,
) -> mtmd_bitmap_p:
    ...


# MTMD_API mtmd_bitmap *         mtmd_bitmap_init_from_audio(size_t n_samples,         const float         * data);
@ctypes_function_mtmd(
    "mtmd_bitmap_init_from_audio", [
        c_size_t,
        POINTER(c_float)
    ],
    mtmd_bitmap_p_ctypes,
)
def mtmd_bitmap_init_from_audio(
    n_samples: c_size_t,
    data: POINTER(c_float), # type: ignore
    /,
) -> mtmd_bitmap_p:
    ...


# MTMD_API uint32_t              mtmd_bitmap_get_nx     (const mtmd_bitmap * bitmap);
@ctypes_function_mtmd("mtmd_bitmap_get_nx", [mtmd_bitmap_p_ctypes], c_uint32)
def mtmd_bitmap_get_nx(bitmap: mtmd_bitmap_p) -> c_uint32:
    ...

# MTMD_API uint32_t              mtmd_bitmap_get_ny     (const mtmd_bitmap * bitmap);
@ctypes_function_mtmd("mtmd_bitmap_get_ny", [mtmd_bitmap_p_ctypes], c_uint32)
def mtmd_bitmap_get_ny(bitmap: mtmd_bitmap_p) -> c_uint32:
    ...

# MTMD_API const unsigned char * mtmd_bitmap_get_data   (const mtmd_bitmap * bitmap);
@ctypes_function_mtmd("mtmd_bitmap_get_data", [mtmd_bitmap_p_ctypes], POINTER(c_uint8))
def mtmd_bitmap_get_data(bitmap: mtmd_bitmap_p) -> POINTER(c_uint8):  # type: ignore
    ...

# MTMD_API size_t                mtmd_bitmap_get_n_bytes(const mtmd_bitmap * bitmap);
@ctypes_function_mtmd("mtmd_bitmap_get_n_bytes", [mtmd_bitmap_p_ctypes], c_size_t)
def mtmd_bitmap_get_n_bytes(bitmap: mtmd_bitmap_p) -> c_size_t:
    ...

# MTMD_API bool                  mtmd_bitmap_is_audio   (const mtmd_bitmap * bitmap);
@ctypes_function_mtmd("mtmd_bitmap_is_audio", [mtmd_bitmap_p_ctypes], c_bool)
def mtmd_bitmap_is_audio(bitmap: mtmd_bitmap_p) -> c_bool:
    ...

# MTMD_API void                  mtmd_bitmap_free       (mtmd_bitmap * bitmap);
@ctypes_function_mtmd("mtmd_bitmap_free", [mtmd_bitmap_p_ctypes], None)
def mtmd_bitmap_free(bitmap: mtmd_bitmap_p):
    ...

# // bitmap ID is optional, but useful for KV cache tracking
# // these getters/setters are dedicated functions, so you can for example calculate the hash of the image based on mtmd_bitmap_get_data()
# MTMD_API const char * mtmd_bitmap_get_id(const mtmd_bitmap * bitmap);
@ctypes_function_mtmd("mtmd_bitmap_get_id", [mtmd_bitmap_p_ctypes], c_char_p)
def mtmd_bitmap_get_id(bitmap: mtmd_bitmap_p) -> c_char_p:
    """
    bitmap ID is optional, but useful for KV cache tracking
    these getters/setters are dedicated functions, so you can for example calculate the hash of the image based on mtmd_bitmap_get_data()
    """
    ...


# MTMD_API void         mtmd_bitmap_set_id(mtmd_bitmap * bitmap, const char * id);
@ctypes_function_mtmd(
    "mtmd_bitmap_set_id", [
        mtmd_bitmap_p_ctypes,
        c_char_p,
    ], None)
def mtmd_bitmap_set_id(
    bitmap: mtmd_bitmap_p,
    id: c_char_p,
    /,
):
    ...


# // if true, this bitmap can be merged (temporal merge) with an adjacent mergeable bitmap by certain video input models
# MTMD_API void         mtmd_bitmap_set_mergeable(mtmd_bitmap * bitmap, bool mergeable);
@ctypes_function_mtmd(
    "mtmd_bitmap_set_mergeable", [
        mtmd_bitmap_p_ctypes,
        c_bool,
    ], None)
def mtmd_bitmap_set_mergeable(
    bitmap: mtmd_bitmap_p,
    mergeable: bool,
    /,
):
    """
    if true, this bitmap can be merged (temporal merge) with an adjacent mergeable bitmap by certain video input models
    """
    ...


# MTMD_API void mtmd_bitmap_set_is_video(mtmd_bitmap * bitmap, bool is_video);
@ctypes_function_mtmd("mtmd_bitmap_set_is_video", [mtmd_bitmap_p_ctypes, c_bool], None)
def mtmd_bitmap_set_is_video(bitmap: mtmd_bitmap_p, is_video: bool, /) -> None:
    """Mark a frame or lazy video; manual frames also need mergeable=True.

    Lazy videos receive model-specific begin/end tokens and group their
    expanded audio chunks into one soundtrack for LFM3-Omni.
    """
    ...


# // mtmd_bitmap lazy
# //
# // this is a special bitmap that:
# // - does not hold the actual data
# // - can be expanded into one or more chunks (either media to text chunks)
# // user must provide a callback to fill in the data when mtmd_tokenize() is called
# // this is useful for large video inputs:
# // - allow reading video frame by frame, without loading the entire video into memory
# // - allow tracking the whole video with a single ID (for example, the file hash)

# // set (*out_bitmap) to non-nullptr to emit a bitmap chunk; it will be freed automatically
# // set (*out_text) to non-nullptr to emit a text chunk; it must be heap-allocated, null-terminated and will be freed automatically
# // either out_bitmap or out_text can be set, but not both
# // out_bitmap cannot be another lazy bitmap (no nested lazy allowed)
# // return value:
# //    0 on success
# //   -1 on EOF (signal to mtmd_tokenize to move on)
# //   -2 on error (signal to mtmd_tokenize to abort)
# typedef int(* mtmd_bitmap_lazy_callback)(
#     size_t chunk_idx,
#     void * user_data,
#     mtmd_bitmap ** out_bitmap,
#     char ** out_text);
mtmd_bitmap_lazy_callback = CFUNCTYPE(
    c_int,
    c_size_t,                 # chunk_idx
    c_void_p,                 # user_data
    POINTER(mtmd_bitmap_p_ctypes),   # mtmd_bitmap ** out_bitmap
    POINTER(c_char_p),               # char ** out_text
)

# MTMD_API mtmd_bitmap * mtmd_bitmap_init_lazy(mtmd_context * ctx,
#                                              const char * id, // usually set to file hash
#                                              void * user_data,
#                                              mtmd_bitmap_lazy_callback callback);
@ctypes_function_mtmd(
    "mtmd_bitmap_init_lazy", [
        mtmd_context_p_ctypes,
        c_char_p,
        c_void_p,
        mtmd_bitmap_lazy_callback,
    ], mtmd_bitmap_p_ctypes)
def mtmd_bitmap_init_lazy(
    ctx: mtmd_context_p,
    id: c_char_p,
    user_data: c_void_p,
    callback: Optional[mtmd_bitmap_lazy_callback],  # type: ignore
    /,
) -> mtmd_bitmap_p:
    ...


# // mtmd_input_chunks
# //
# // this is simply a list of mtmd_input_chunk
# // the elements can only be populated via mtmd_tokenize()
# MTMD_API mtmd_input_chunks *      mtmd_input_chunks_init(void);
@ctypes_function_mtmd("mtmd_input_chunks_init", [], mtmd_input_chunks_p_ctypes)
def mtmd_input_chunks_init() -> mtmd_input_chunks_p:
    """
    this is simply a list of mtmd_input_chunk
    the elements can only be populated via mtmd_tokenize()
    """
    ...


# MTMD_API size_t                   mtmd_input_chunks_size(const mtmd_input_chunks * chunks);
@ctypes_function_mtmd("mtmd_input_chunks_size", [mtmd_input_chunks_p_ctypes], c_size_t)
def mtmd_input_chunks_size(chunks: mtmd_input_chunks_p) -> c_size_t:
    ...


# MTMD_API const mtmd_input_chunk * mtmd_input_chunks_get (const mtmd_input_chunks * chunks, size_t idx);
@ctypes_function_mtmd(
    "mtmd_input_chunks_get", [
        mtmd_input_chunks_p_ctypes,
        c_size_t,
    ], mtmd_input_chunk_p_ctypes)
def mtmd_input_chunks_get(
    chunks: mtmd_input_chunks_p,
    idx: c_size_t,
    /,
) -> mtmd_input_chunk_p:
    ...


# MTMD_API void                     mtmd_input_chunks_free(mtmd_input_chunks * chunks);
@ctypes_function_mtmd("mtmd_input_chunks_free", [mtmd_input_chunks_p_ctypes], None)
def mtmd_input_chunks_free(chunks: mtmd_input_chunks_p):
    ...


# // mtmd_input_chunk
# //
# // the instance will be constructed via mtmd_tokenize()
# // it will be freed along with mtmd_input_chunks
# MTMD_API enum mtmd_input_chunk_type mtmd_input_chunk_get_type        (const mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_get_type", [mtmd_input_chunk_p_ctypes], c_int32)
def mtmd_input_chunk_get_type(chunk: mtmd_input_chunk_p) -> c_int32:
    """
    the instance will be constructed via mtmd_tokenize()
    it will be freed along with mtmd_input_chunks
    """
    ...

# MTMD_API const llama_token * mtmd_input_chunk_get_tokens_text(const mtmd_input_chunk * chunk, size_t * n_tokens_output);
@ctypes_function_mtmd(
    "mtmd_input_chunk_get_tokens_text",
    [mtmd_input_chunk_p_ctypes, POINTER(c_size_t)],
    POINTER(llama_cpp_lib.llama_token)
)
def mtmd_input_chunk_get_tokens_text(
    chunk: mtmd_input_chunk_p, n_tokens_output: "_Pointer[c_size_t]", /
) -> Optional["_Pointer[llama_cpp_lib.llama_token]"]:
    ...

# MTMD_API const mtmd_image_tokens *  mtmd_input_chunk_get_tokens_image(const mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_get_tokens_image", [mtmd_input_chunk_p_ctypes], mtmd_image_tokens_p_ctypes)
def mtmd_input_chunk_get_tokens_image(chunk: mtmd_input_chunk_p) -> mtmd_image_tokens_p:
    ...

# MTMD_API size_t                     mtmd_input_chunk_get_n_tokens    (const mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_get_n_tokens", [mtmd_input_chunk_p_ctypes], c_size_t)
def mtmd_input_chunk_get_n_tokens(chunk: mtmd_input_chunk_p) -> c_size_t:
    ...

# // returns nullptr for ID on text chunk
# MTMD_API const char *               mtmd_input_chunk_get_id          (const mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_get_id", [mtmd_input_chunk_p_ctypes], c_char_p)
def mtmd_input_chunk_get_id(chunk: mtmd_input_chunk_p) -> c_char_p:
    """
    returns nullptr for ID on text chunk
    """
    ...

# // number of temporal positions (equals to max(t,h,w) for M-RoPE; equals to n_tokens otherwise)
# MTMD_API llama_pos                  mtmd_input_chunk_get_n_pos       (const mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_get_n_pos", [mtmd_input_chunk_p_ctypes], c_int32)
def mtmd_input_chunk_get_n_pos(chunk: mtmd_input_chunk_p) -> c_int32:
    """
    number of temporal positions (equals to max(t,h,w) for M-RoPE; equals to n_tokens otherwise)
    """
    ...

# // in case you want to use custom logic to handle the chunk (i.e. KV cache management)
# // you can move the chunk ownership to your own code by copying it
# // remember to free the chunk when you are done with it
# MTMD_API mtmd_input_chunk * mtmd_input_chunk_copy(const mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_copy", [mtmd_input_chunk_p_ctypes], mtmd_input_chunk_p_ctypes)
def mtmd_input_chunk_copy(chunk: mtmd_input_chunk_p) -> mtmd_input_chunk_p:
    """
    in case you want to use custom logic to handle the chunk (i.e. KV cache management)
    you can move the chunk ownership to your own code by copying it
    remember to free the chunk when you are done with it
    """
    ...

# MTMD_API void               mtmd_input_chunk_free(mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_free", [mtmd_input_chunk_p_ctypes], None)
def mtmd_input_chunk_free(chunk: mtmd_input_chunk_p):
    """
    remember to free the chunk when you are done with it
    """
    ...

# // similar to mtmd_input_chunk_copy, but returns a placeholder chunk
# MTMD_API mtmd_input_chunk * mtmd_input_chunk_get_placeholder(const mtmd_input_chunk * chunk);
@ctypes_function_mtmd("mtmd_input_chunk_get_placeholder", [mtmd_input_chunk_p_ctypes], mtmd_input_chunk_p_ctypes)
def mtmd_input_chunk_get_placeholder(chunk: mtmd_input_chunk_p) -> mtmd_input_chunk_p:
    """
    similar to mtmd_input_chunk_copy, but returns a placeholder chunk
    """
    ...

# // save/load an input chunk to/from a buffer (useful for KV save/load)
# // important: only chunk's metadata will be saved, the actual image/audio data will not be saved
# // the loaded chunk will always be a placeholder, cannot be used for mtmd_encode() or mtmd_batch_encode()
# // out_buf can be nullptr (to query expected_out_len)
# // returns 0 on success, non-zero on failure
# MTMD_API int32_t            mtmd_input_chunk_save(const mtmd_input_chunk * chunk, char * out_buf, size_t out_len, size_t * expected_out_len);
@ctypes_function_mtmd("mtmd_input_chunk_save",
    [
        mtmd_input_chunk_p_ctypes,
        POINTER(c_uint8),  # Writable byte storage; reject immutable Python bytes.
        c_size_t,
        POINTER(c_size_t),
    ],
    c_int32,
)
def mtmd_input_chunk_save(
    chunk: mtmd_input_chunk_p,
    out_buf: Optional[CtypesArray[c_uint8]],
    out_len: c_size_t,
    expected_out_len: POINTER(c_size_t),  # type: ignore
) -> int:
    """
    save an input chunk to/from a buffer (useful for KV save)
    important: only chunk's metadata will be saved, the actual image/audio data will not be saved
    the loaded chunk will always be a placeholder, cannot be used for mtmd_encode() or mtmd_batch_encode()
    out_buf can be nullptr (to query expected_out_len)
    Otherwise pass a c_uint8 array/pointer with at least out_len writable bytes.
    returns 0 on success, non-zero on failure
    """
    ...

# // returns nullptr on failure
# MTMD_API mtmd_input_chunk * mtmd_input_chunk_load(const char * buf, size_t len);
@ctypes_function_mtmd("mtmd_input_chunk_load",
    [
        c_char_p,
        c_size_t
    ],
    mtmd_input_chunk_p_ctypes,
)
def mtmd_input_chunk_load(
    buf: bytes,
    len: c_size_t,
) -> mtmd_input_chunk_p:
    """
    load an input chunk from a buffer (useful for KV load)
    important: only chunk's metadata will be saved, the actual image/audio data will not be saved
    the loaded chunk will always be a placeholder, cannot be used for mtmd_encode() or mtmd_batch_encode()
    returns nullptr on failure
    """
    ...

# // mtmd_image_tokens
# //
# // the instance will be constructed via mtmd_tokenize()
# // it will be freed along with mtmd_input_chunk
# MTMD_API size_t       mtmd_image_tokens_get_n_tokens(const mtmd_image_tokens * image_tokens); // TODO: deprecate
@ctypes_function_mtmd(
    "mtmd_image_tokens_get_n_tokens", [mtmd_image_tokens_p_ctypes], c_size_t)
def mtmd_image_tokens_get_n_tokens(image_tokens: mtmd_image_tokens_p) -> c_size_t:
    ...

# MTMD_API const char * mtmd_image_tokens_get_id      (const mtmd_image_tokens * image_tokens); // TODO: deprecate
@ctypes_function_mtmd(
    "mtmd_image_tokens_get_id", [mtmd_image_tokens_p_ctypes], c_char_p)
def mtmd_image_tokens_get_id(image_tokens: mtmd_image_tokens_p) -> c_char_p:
    ...

# // number of temporal positions (equals to max(t,h,w) for M-RoPE; equals to n_tokens otherwise)
# MTMD_API llama_pos    mtmd_image_tokens_get_n_pos   (const mtmd_image_tokens * image_tokens); // TODO: deprecate
@ctypes_function_mtmd(
    "mtmd_image_tokens_get_n_pos", [mtmd_image_tokens_p_ctypes], c_int32)
def mtmd_image_tokens_get_n_pos(image_tokens: mtmd_image_tokens_p) -> c_int32:
    """number of temporal positions (equals to max(t,h,w) for M-RoPE; equals to n_tokens otherwise)"""
    ...

# DEPRECATED(MTMD_API size_t mtmd_image_tokens_get_nx(const mtmd_image_tokens * image_tokens),
#            "use mtmd_image_tokens_get_decoder_pos() instead");
@ctypes_function_mtmd(
    "mtmd_image_tokens_get_nx", [mtmd_image_tokens_p_ctypes], c_size_t)
def mtmd_image_tokens_get_nx(image_tokens: mtmd_image_tokens_p) -> c_size_t:
    """
    use mtmd_image_tokens_get_decoder_pos() instead
    """
    ...

# DEPRECATED(MTMD_API size_t mtmd_image_tokens_get_ny(const mtmd_image_tokens * image_tokens),
#            "use mtmd_image_tokens_get_decoder_pos() instead");
@ctypes_function_mtmd(
    "mtmd_image_tokens_get_ny", [mtmd_image_tokens_p_ctypes], c_size_t)
def mtmd_image_tokens_get_ny(image_tokens: mtmd_image_tokens_p) -> c_size_t:
    """
    use mtmd_image_tokens_get_decoder_pos() instead
    """
    ...

# struct mtmd_decoder_pos {
#     uint32_t t;
#     uint32_t x;
#     uint32_t y;
#     uint32_t z;
# };
class mtmd_decoder_pos(Structure):
    _fields_ = [
        ("t", c_uint32),
        ("x", c_uint32),
        ("y", c_uint32),
        ("z", c_uint32),
    ]

    if TYPE_CHECKING:
        t: c_uint32
        x: c_uint32
        y: c_uint32
        z: c_uint32

mtmd_decoder_pos_p_ctypes = POINTER(mtmd_decoder_pos)

# // get position for decoder attention, to be used by M-RoPE models
# // i is the index of the embedding token, ranging from 0 to mtmd_image_tokens_get_n_tokens() - 1
# // pos_0 is the absolute position of the first token
# // return relative position (for example, embedding 0 will have position (0, 0, 0); remember to adjust it to the current absolute position)
# MTMD_API struct mtmd_decoder_pos mtmd_image_tokens_get_decoder_pos(const mtmd_image_tokens * image_tokens, llama_pos pos_0, size_t i);
@ctypes_function_mtmd(
    "mtmd_image_tokens_get_decoder_pos", [mtmd_image_tokens_p_ctypes, c_int32, c_size_t], mtmd_decoder_pos)
def mtmd_image_tokens_get_decoder_pos(image_tokens: mtmd_image_tokens_p, pos_0: c_int32, i: c_size_t) -> mtmd_decoder_pos:
    """
    get position for decoder attention, to be used by M-RoPE models
    i is the index of the embedding token, ranging from 0 to mtmd_image_tokens_get_n_tokens() - 1
    pos_0 is the absolute position of the first token
    return relative position (for example, embedding 0 will have position (0, 0, 0); remember to adjust it to the current absolute position)
    """
    ...

# // tokenize an input text prompt and a list of bitmaps (image/audio)
# // the prompt must have the input media marker (default: "<__media__>") in it
# // the default marker is defined by mtmd_default_marker()
# // the marker will be replaced with the media chunk
# // for example:
# //   "here is an image: <__media__>\ndescribe it in detail."
# //   this will gives 3 chunks:
# //   1. "here is an image: <start_of_image>"
# //   2. (image/audio tokens)
# //   3. "<end_of_image>\ndescribe it in detail."
# // number of bitmaps must be equal to the number of markers in the prompt
# // this function is thread-safe (shared ctx)
# // return values:
# //   0 on success
# //   1 on number of bitmaps not matching the number of markers
# //   2 on media preprocessing error
# MTMD_API int32_t mtmd_tokenize(mtmd_context * ctx,
#                                mtmd_input_chunks * output,
#                                const mtmd_input_text * text,
#                                const mtmd_bitmap ** bitmaps,
#                                size_t n_bitmaps);
@ctypes_function_mtmd(
    "mtmd_tokenize", [
        mtmd_context_p_ctypes,
        mtmd_input_chunks_p_ctypes,
        mtmd_input_text_p_ctypes,
        POINTER(mtmd_bitmap_p_ctypes),
        c_size_t,
    ],
    c_int32,
)
def mtmd_tokenize(
    ctx: mtmd_context_p,
    output: mtmd_input_chunks_p,
    text: mtmd_input_text_p,
    bitmaps: POINTER(mtmd_bitmap_p_ctypes), # type: ignore
    n_bitmaps: c_size_t,
    /,
) -> c_int32:
    """
    tokenize an input text prompt and a list of bitmaps (image/audio)
    the prompt must have the input media marker (default: "<__media__>") in it
    the default marker is defined by mtmd_default_marker()
    the marker will be replaced with the media chunk

    for example:
     "here is an image: <__media__>\ndescribe it in detail."
      this will gives 3 chunks:
       1. "here is an image: <start_of_image>"
       2. (image/audio tokens)
       3. "<end_of_image>\\ndescribe it in detail."

     number of bitmaps must be equal to the number of markers in the prompt
     this function is thread-safe (shared ctx)

    return values:
      0 on success
      1 on number of bitmaps not matching the number of markers
      2 on media preprocessing error
    """
    ...


# // same as mtmd_tokenize(), but takes an array of mtmd_input_part
# // use cases:
# // - when you don't want to use media markers (they will be tokenized as normal text)
# // - when you want to control parse_special for each text part
# // note: per-part add_special will be ignored
# // return 1 if a part has both text and bitmap set (or neither)
# MTMD_API int32_t mtmd_tokenize_from_parts(mtmd_context * ctx,
#                                           mtmd_input_chunks * output,
#                                           const mtmd_input_part ** parts,
#                                           size_t n_parts,
#                                           bool add_special);
@ctypes_function_mtmd(
    "mtmd_tokenize_from_parts", [
        mtmd_context_p_ctypes,
        mtmd_input_chunks_p_ctypes,
        POINTER(mtmd_input_part_p_ctypes),
        c_size_t,
        c_bool,
    ],
    c_int32,
)
def mtmd_tokenize_from_parts(
    ctx: mtmd_context_p,
    output: mtmd_input_chunks_p,
    parts: POINTER(mtmd_input_part_p_ctypes), # type: ignore
    n_parts: c_size_t,
    add_special: c_bool,
    /,
) -> c_int32:
    """
    same as mtmd_tokenize(), but takes an array of mtmd_input_part

    use cases:
     - when you don't want to use media markers (they will be tokenized as normal text)
     - when you want to control parse_special for each text part

    note: per-part add_special will be ignored.
    return 1 if a part has both text and bitmap set (or neither)
    """
    ...

# // returns 0 on success
# // TODO: deprecate
# DEPRECATED(MTMD_API int32_t mtmd_encode(mtmd_context * ctx, const mtmd_image_tokens * image_tokens),
#            "use mtmd_encode_chunk() instead");
@ctypes_function_mtmd(
    "mtmd_encode", [
        mtmd_context_p_ctypes,
        mtmd_image_tokens_p_ctypes
    ],
    c_int32,
)
def mtmd_encode(
    ctx: mtmd_context_p,
    image_tokens: mtmd_image_tokens_p,
    /,
) -> c_int32:
    """
    DEPRECATED: use mtmd_encode_chunk() instead
    """
    ...


# // text chunk will be ignored silently, only media chunk will be encoded
# // returns 0 on success
# // returns 1 on generic error
# MTMD_API int32_t mtmd_encode_chunk(mtmd_context * ctx,
#                                    const mtmd_input_chunk * chunk);
@ctypes_function_mtmd(
    "mtmd_encode_chunk", [
        mtmd_context_p_ctypes,
        mtmd_input_chunk_p_ctypes
    ],
    c_int32,
)
def mtmd_encode_chunk(
    ctx: mtmd_context_p,
    chunk: mtmd_input_chunk_p,
    /,
) -> c_int32:
    """
    text chunk will be ignored silently, only media chunk will be encoded
    returns 0 on success
    returns 1 on generic error
    """
    ...

# // get output embeddings from the last encode pass
# // the reading size (in bytes) is equal to:
# // llama_model_n_embd_inp(model) * mtmd_input_chunk_get_n_tokens(chunk) * sizeof(float)
# MTMD_API float * mtmd_get_output_embd(mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_get_output_embd", [mtmd_context_p_ctypes], POINTER(c_float))
def mtmd_get_output_embd(ctx: mtmd_context_p) -> POINTER(c_float): # type: ignore
    """
    get output embeddings from the last encode pass
    """
    ...


# // batch encoding API
# // chunks are not owned by the batch, they will not be freed by mtmd_batch_free()
# // batch is valid for a given context, cannot be shared across contexts
# MTMD_API mtmd_batch * mtmd_batch_init(mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_batch_init",
    [mtmd_context_p_ctypes],
    mtmd_batch_p_ctypes,
)
def mtmd_batch_init(ctx: mtmd_context_p, /) -> mtmd_batch_p:
    ...


# MTMD_API void         mtmd_batch_free(mtmd_batch * batch);
@ctypes_function_mtmd(
    "mtmd_batch_free",
    [mtmd_batch_p_ctypes],
    None,
)
def mtmd_batch_free(batch: mtmd_batch_p, /):
    """
    chunks are not owned by the batch, they will not be freed by mtmd_batch_free()
    batch is valid for a given context, cannot be shared across contexts
    """
    ...


# // only media chunks are allowed, text chunks will be rejected
# // returns 0 on success
# // returns 1 on generic error
# // returns 2 if the batch is too large (chunk won't be added)
# // returns 3 if it cannot be batched with the existing chunks in the batch
# MTMD_API int32_t mtmd_batch_add_chunk(mtmd_batch * batch, const mtmd_input_chunk * chunk);
@ctypes_function_mtmd(
    "mtmd_batch_add_chunk",
    [
        mtmd_batch_p_ctypes,
        mtmd_input_chunk_p_ctypes,
    ],
    c_int32,
)
def mtmd_batch_add_chunk(
    batch: mtmd_batch_p,
    chunk: mtmd_input_chunk_p,
    /,
) -> c_int32:
    """
    only media chunks are allowed, text chunks will be rejected
    returns 0 on success
    returns 1 on generic error
    returns 2 if the batch is too large (chunk won't be added)
    returns 3 if it cannot be batched with the existing chunks in the batch
    """
    ...


# // returns 0 on success
# // returns 1 on generic error
# MTMD_API int32_t mtmd_batch_encode(mtmd_batch * batch);
@ctypes_function_mtmd(
    "mtmd_batch_encode",
    [mtmd_batch_p_ctypes],
    c_int32,
)
def mtmd_batch_encode(batch: mtmd_batch_p, /) -> c_int32:
    """
    returns 0 on success
    returns 1 on generic error
    """
    ...


# MTMD_API float * mtmd_batch_get_output_embd(mtmd_batch * batch, const mtmd_input_chunk * chunk);
@ctypes_function_mtmd(
    "mtmd_batch_get_output_embd",
    [
        mtmd_batch_p_ctypes,
        mtmd_input_chunk_p_ctypes,
    ],
    POINTER(c_float),
)
def mtmd_batch_get_output_embd(
    batch: mtmd_batch_p,
    chunk: mtmd_input_chunk_p,
    /,
) -> POINTER(c_float):  # type: ignore
    ...


# // Set callback for all future logging events.
# // If this is not called, or NULL is supplied, everything is output on stderr.
# MTMD_API void mtmd_log_set(ggml_log_callback log_callback, void * user_data);
@ctypes_function_mtmd(
    "mtmd_log_set", [ggml_log_callback, c_void_p], None)
def mtmd_log_set(log_callback: ggml_log_callback, user_data: c_void_p): # type: ignore
    """
    Set callback for all future logging events.
    """
    ...


# // EXPERIMENTAL API to get mmproj's capabilities without initializing the full context
# // This is only intended to be used by llama-server, breaking changes is expected
# struct mtmd_caps {
#     bool inp_vision;
#     bool inp_audio;
#     bool gen_audio;
# };
class mtmd_caps(Structure):
    _fields_ = [
        ("inp_vision", c_bool),
        ("inp_audio", c_bool),
        ("gen_audio", c_bool),
    ]

    if TYPE_CHECKING:
        inp_vision: c_bool
        inp_audio: c_bool
        gen_audio: c_bool


# MTMD_API struct mtmd_caps mtmd_get_cap_from_file(const char * mmproj_fname);
@ctypes_function_mtmd(
    "mtmd_get_cap_from_file", [c_char_p], mtmd_caps)
def mtmd_get_cap_from_file(mmproj_fname: c_char_p) -> mtmd_caps:
    """
    EXPERIMENTAL API to get mmproj's capabilities without initializing the full context.
    This is only intended to be used by llama-server, breaking changes is expected
    """
    ...


# // EXPERIMENTAL API for realtime audio input, subjected to breaking changes

mtmd_audio_stream_p = NewType("mtmd_audio_stream_p", int)
mtmd_audio_stream_p_ctypes = c_void_p

# struct mtmd_audio_stream_params {
#     int32_t step_ms; // audio encoded per encoder call, rounded up to the model step (default: 320)
#     const llama_token * prompt;
#     size_t n_prompt;
# };
class mtmd_audio_stream_params(Structure):
    """Encoder step size and optional opening tokens for realtime ASR."""

    _fields_ = [
        ("step_ms", c_int32),
        ("prompt", POINTER(llama_cpp_lib.llama_token)),
        ("n_prompt", c_size_t),
    ]

    if TYPE_CHECKING:
        step_ms: int
        prompt: _Pointer[llama_cpp_lib.llama_token]
        n_prompt: int


# MTMD_API struct mtmd_audio_stream_params mtmd_audio_stream_params_default(void);
@ctypes_function_mtmd(
    "mtmd_audio_stream_params_default", [], mtmd_audio_stream_params, required=False
)
def mtmd_audio_stream_params_default() -> mtmd_audio_stream_params:
    """Return default stream parameters (step_ms=320)."""
    ...


# // whether the current model supports mtmd_audio_stream
# MTMD_API bool mtmd_support_audio_stream(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_support_audio_stream", [mtmd_context_p_ctypes], c_bool, required=False
)
def mtmd_support_audio_stream(ctx: mtmd_context_p) -> bool:
    """Whether the model supports realtime audio input with decoder feedback."""
    ...


# // returns nullptr on failure
# MTMD_API mtmd_audio_stream * mtmd_audio_stream_init(mtmd_context * ctx, struct mtmd_audio_stream_params params);
@ctypes_function_mtmd(
    "mtmd_audio_stream_init",
    [mtmd_context_p_ctypes, mtmd_audio_stream_params],
    mtmd_audio_stream_p_ctypes,
    required=False,
)
def mtmd_audio_stream_init(
    ctx: mtmd_context_p, params: mtmd_audio_stream_params
) -> mtmd_audio_stream_p:
    """Create a stream, or return NULL on failure.

    The MTMD context must have been initialized with a text model. Keep both
    alive until the stream is released with mtmd_audio_stream_free().
    prompt/n_prompt optionally supply the model's ASR template tokens.
    """
    ...


# MTMD_API void mtmd_audio_stream_free(mtmd_audio_stream * stream);
@ctypes_function_mtmd(
    "mtmd_audio_stream_free", [mtmd_audio_stream_p_ctypes], None, required=False
)
def mtmd_audio_stream_free(stream: mtmd_audio_stream_p) -> None:
    """Release a stream and its encoder state."""
    ...


# // samples are PCM F32 at mtmd_get_audio_sample_rate()
# // returns 0 on success, 1 if the stream has ended
# MTMD_API int32_t mtmd_audio_stream_push(mtmd_audio_stream * stream, const float * samples, size_t n_samples);
@ctypes_function_mtmd(
    "mtmd_audio_stream_push",
    [mtmd_audio_stream_p_ctypes, POINTER(c_float), c_size_t],
    c_int32,
    required=False,
)
def mtmd_audio_stream_push(
    stream: mtmd_audio_stream_p, samples: _Pointer[c_float], n_samples: int
) -> int:
    """Copy PCM F32 samples at mtmd_get_audio_sample_rate() into the stream.

    Return 0 on success, or 1 if the stream has ended.
    """
    ...


# // pad the stream so that all pending rows can be produced
# // end = false: the stream stays open (use it on a pause, to get a partial transcript)
# // end = true:  no more push() is accepted
# // returns 0 on success, 1 if the stream has ended
# MTMD_API int32_t mtmd_audio_stream_flush(mtmd_audio_stream * stream, bool end);
@ctypes_function_mtmd(
    "mtmd_audio_stream_flush", [mtmd_audio_stream_p_ctypes, c_bool], c_int32,
    required=False,
)
def mtmd_audio_stream_flush(stream: mtmd_audio_stream_p, end: bool) -> int:
    """Pad pending audio for decoding; end=True also prevents further pushes.

    Use end=False on a pause to get a partial transcript and keep the stream
    open. Return 0 on success, or 1 if it has already ended.
    """
    ...


# // produce the next decoder rows
# // last_token is the token sampled from the previous row, LLAMA_TOKEN_NULL before the first sample
# // return value:
# //   > 0 number of rows ready, read them with mtmd_audio_stream_get_output_embd()
# //   0   more audio is needed
# //   -1  end of stream, nothing more will be produced
# //   -2  error
# MTMD_API int32_t mtmd_audio_stream_step(mtmd_audio_stream * stream, llama_token last_token);
@ctypes_function_mtmd(
    "mtmd_audio_stream_step",
    [mtmd_audio_stream_p_ctypes, llama_cpp_lib.llama_token],
    c_int32,
    required=False,
)
def mtmd_audio_stream_step(stream: mtmd_audio_stream_p, last_token: int) -> int:
    """Produce decoder rows using the token sampled from the previous step.

    Pass LLAMA_TOKEN_NULL before the first sample. Return a positive row
    count, 0 for more audio, -1 for end of stream, or -2 on error.
    """
    ...


# // rows of the last step, the reading size (in bytes) is n_rows * llama_model_n_embd_inp(model) * sizeof(float)
# MTMD_API const float * mtmd_audio_stream_get_output_embd(const mtmd_audio_stream * stream);
@ctypes_function_mtmd(
    "mtmd_audio_stream_get_output_embd", [mtmd_audio_stream_p_ctypes],
    POINTER(c_float), required=False,
)
def mtmd_audio_stream_get_output_embd(stream: mtmd_audio_stream_p) -> _Pointer[c_float]:
    """Borrow the rows produced by the last step; copy before the next step.

    Read n_rows * llama_model_n_embd_inp(model) floats. The stream owns the
    buffer; it also becomes invalid when the stream is freed.
    """
    ...


# MTMD_API bool mtmd_audio_stream_is_seq_start(const mtmd_audio_stream * stream);
@ctypes_function_mtmd(
    "mtmd_audio_stream_is_seq_start", [mtmd_audio_stream_p_ctypes],
    c_bool, required=False,
)
def mtmd_audio_stream_is_seq_start(stream: mtmd_audio_stream_p) -> bool:
    """Whether the last step starts a sequence; clear the decoder sequence first."""
    ...


# MTMD_API int64_t mtmd_audio_stream_get_n_rows(const mtmd_audio_stream * stream);
@ctypes_function_mtmd(
    "mtmd_audio_stream_get_n_rows", [mtmd_audio_stream_p_ctypes],
    c_int64, required=False,
)
def mtmd_audio_stream_get_n_rows(stream: mtmd_audio_stream_p) -> int:
    """Return audio rows whose text has been sampled, including prefix rows.

    step() commits this progress from last_token.
    """
    ...


# MTMD_API int64_t mtmd_audio_stream_get_n_rows_flushed(const mtmd_audio_stream * stream);
@ctypes_function_mtmd(
    "mtmd_audio_stream_get_n_rows_flushed", [mtmd_audio_stream_p_ctypes],
    c_int64, required=False,
)
def mtmd_audio_stream_get_n_rows_flushed(stream: mtmd_audio_stream_p) -> int:
    """Return the row target through the last flush for a live stream.

    Once get_n_rows reaches this target, the flushed audio's text has been sampled.
    """
    ...


# // EXPERIMENTAL API for audio generation, subjected to breaking changes

# // represent the pipeline type
# enum mtmd_gen_audio_type {
#     MTMD_GEN_AUDIO_TYPE_NONE, // not supported
#     MTMD_GEN_AUDIO_TYPE_QWEN3TTS,
#     MTMD_GEN_AUDIO_TYPE_POCKETTTS,
#     MTMD_GEN_AUDIO_TYPE_SOPRANO,
#     MTMD_GEN_AUDIO_TYPE_LFM3A,
#     MTMD_GEN_AUDIO_TYPE_CHATTERBOX,
#     MTMD_GEN_AUDIO_TYPE_DRAMA3,
# };
class mtmd_gen_audio_type(enum.IntEnum):
    """Generated audio pipeline type."""
    MTMD_GEN_AUDIO_TYPE_NONE      = 0
    MTMD_GEN_AUDIO_TYPE_QWEN3TTS  = 1
    MTMD_GEN_AUDIO_TYPE_POCKETTTS = 2
    MTMD_GEN_AUDIO_TYPE_SOPRANO   = 3
    MTMD_GEN_AUDIO_TYPE_LFM3A     = 4
    MTMD_GEN_AUDIO_TYPE_CHATTERBOX = 5
    MTMD_GEN_AUDIO_TYPE_DRAMA3    = 6

# struct mtmd_gen_audio_info {
#     enum mtmd_gen_audio_type type;
#     int32_t sample_rate; // in Hz, for example 24000 for qwen3tts
#     const char * model_variant; // name of the weight variant, can be nullptr if not applicable
#     int32_t n_voices; // predefined voices
# };
class mtmd_gen_audio_info(Structure):
    """Audio generation pipeline information."""

    _fields_ = [
        ("type", c_int),
        ("sample_rate", c_int32),
        ("model_variant", c_char_p),
        ("n_voices", c_int32),
    ]

    if TYPE_CHECKING:
        type: int
        sample_rate: int
        model_variant: Optional[bytes]
        n_voices: int

# MTMD_API struct mtmd_gen_audio_info mtmd_gen_audio_get_info(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_gen_audio_get_info",
    [
        mtmd_context_p_ctypes,
    ],
    mtmd_gen_audio_info,
)
def mtmd_gen_audio_get_info(
    ctx: mtmd_context_p,
) -> mtmd_gen_audio_info:
    ...


# MTMD_API size_t mtmd_gen_audio_read_tensor(mtmd_context * ctx, const char * name, float * out, size_t n_max);
@ctypes_function_mtmd("mtmd_gen_audio_read_tensor",
    [mtmd_context_p_ctypes, c_char_p, POINTER(c_float), c_size_t], c_size_t)
def mtmd_gen_audio_read_tensor(ctx: mtmd_context_p, name: bytes, out, n_max: int) -> int:
    """Read F32 elements; NULL queries the count. Missing/undersized returns zero."""
    ...


@ctypes_function_mtmd("mtmd_gen_audio_voice_name", [mtmd_context_p_ctypes, c_int32], c_char_p)
def mtmd_gen_audio_voice_name(ctx: mtmd_context_p, index: int) -> Optional[bytes]:
    """Return the borrowed name of a predefined voice, or None."""
    ...


@ctypes_function_mtmd("mtmd_gen_audio_get_voice", [mtmd_context_p_ctypes, c_char_p], mtmd_bitmap_p_ctypes)
def mtmd_gen_audio_get_voice(ctx: mtmd_context_p, name: bytes) -> mtmd_bitmap_p:
    """Return a voice bitmap owned by the caller, or NULL."""
    ...


@ctypes_function_mtmd("mtmd_bitmap_is_voice", [mtmd_bitmap_p_ctypes], c_bool)
def mtmd_bitmap_is_voice(bitmap: mtmd_bitmap_p) -> bool:
    ...

# enum mtmd_gen_process_type {
#     MTMD_GEN_PROCESS_TYPE_GEN_CODE, // h_state to semantic (codes, mel-spectrogram, etc.)
#     MTMD_GEN_PROCESS_TYPE_GEN_WAV,  // convert semantic to PCM audio
#                                     // for qwen3tts, this is code2wav
#                                     // for pocket-tts, this is mimi decoder
#                                     // for lfm3a, n_codes == 0 flushes the codec tail
# };
class mtmd_gen_process_type(enum.IntEnum):
    """Generated audio processing stage."""
    # hidden state -> semantic codes
    MTMD_GEN_PROCESS_TYPE_GEN_CODE = 0
    # semantic codes -> PCM audio
    MTMD_GEN_PROCESS_TYPE_GEN_WAV = 1

# struct mtmd_gen_inp {
#     enum mtmd_gen_process_type type;

#     // for MTMD_GEN_PROCESS_TYPE_GEN_CODE
#     int32_t code0;  // the sampled codebook 0 entry from backbone
#     float * embd;   // the hidden state from backbone, must have n_text_embd elements
#     int32_t top_k;
#     float   top_p;
#     float   temp; // sampling temperature, or noise scale for flow-matching decoders
#     float   penalty_repeat; // <= 1 disables code repetition penalty
#     int32_t penalty_last_n; // history window in frames

#     // for MTMD_GEN_PROCESS_TYPE_GEN_WAV
#     // pass either codes (discrete) or feats (continuous), depending on the pipeline
#     int32_t * codes;
#     size_t    n_codes;
#     const float * feats;
#     size_t        n_feats;
# };
class mtmd_gen_inp(Structure):
    """Audio generation input."""

    _fields_ = [
        ("type", c_int),
        # GEN_CODE
        ("code0", c_int32),
        ("embd", POINTER(c_float)),
        ("top_k", c_int32),
        ("top_p", c_float),
        ("temp", c_float),
        ("penalty_repeat", c_float),
        ("penalty_last_n", c_int32),
        # GEN_WAV
        ("codes", POINTER(c_int32)),
        ("n_codes", c_size_t),
        ("feats", POINTER(c_float)),
        ("n_feats", c_size_t),
    ]

    if TYPE_CHECKING:
        # GEN_CODE
        type: int
        code0: int
        embd: POINTER[c_float]
        top_k: int
        top_p: float
        temp: float
        penalty_repeat: float
        penalty_last_n: int
        # GEN_WAV
        codes: POINTER[c_int32]
        n_codes: int
        feats: POINTER[c_float]
        n_feats: int

# struct mtmd_gen_out {
#     // note: output memory is owned by the state, valid until the next process() call with this state
#     // for MTMD_GEN_PROCESS_TYPE_GEN_CODE
#     const int32_t * codes;
#     size_t          n_codes;
#     const float * feats; // continuous counterpart of codes
#     size_t        n_feats;
#     const float * embd; // the generated hidden state, to be fed back to backbone
#                         // it must have n_text_embd elements
#     bool is_eos; // only set by pipelines having the EOS head inside mmproj
#     // for MTMD_GEN_PROCESS_TYPE_GEN_WAV
#     const float * audio;
#     size_t        n_samples;
# };
class mtmd_gen_out(Structure):
    """Audio generation output.
    Memory is owned by mtmd_gen_state and valid until
    the next mtmd_gen_audio_process() call with this state, or state destruction.
    """

    _fields_ = [
        ("codes", POINTER(c_int32)),
        ("n_codes", c_size_t),
        ("feats", POINTER(c_float)),
        ("n_feats", c_size_t),
        ("embd", POINTER(c_float)),
        ("is_eos", c_bool),
        ("audio", POINTER(c_float)),
        ("n_samples", c_size_t),
    ]

    if TYPE_CHECKING:
        codes: POINTER[c_int32]
        n_codes: int
        feats: POINTER[c_float]
        n_feats: int
        embd: POINTER[c_float]
        is_eos: bool
        audio: POINTER[c_float]
        n_samples: int

# struct mtmd_gen_state_params {
#     uint32_t seed; // UINT32_MAX for random
# };
class mtmd_gen_state_params(Structure):
    """Per-generation state parameters; UINT32_MAX selects a random seed."""

    _fields_ = [("seed", c_uint32)]

    if TYPE_CHECKING:
        seed: int


# MTMD_API struct mtmd_gen_state_params mtmd_gen_state_params_default(void);
@ctypes_function_mtmd("mtmd_gen_state_params_default", [], mtmd_gen_state_params)
def mtmd_gen_state_params_default() -> mtmd_gen_state_params:
    ...


# MTMD_API mtmd_gen_state * mtmd_gen_state_init(mtmd_context * ctx, struct mtmd_gen_state_params params);
@ctypes_function_mtmd(
    "mtmd_gen_state_init",
    [mtmd_context_p_ctypes, mtmd_gen_state_params],
    mtmd_gen_state_p_ctypes,
)
def mtmd_gen_state_init(
    ctx: mtmd_context_p, params: mtmd_gen_state_params,
) -> Optional[mtmd_gen_state_p]:
    """Create a generation state; returns null if audio generation is unsupported.

    Use the state only with its originating context and free it before that context.
    """
    ...


# MTMD_API void mtmd_gen_state_free(mtmd_gen_state * state);
@ctypes_function_mtmd("mtmd_gen_state_free", [mtmd_gen_state_p_ctypes], None)
def mtmd_gen_state_free(state: Optional[mtmd_gen_state_p]):
    """Free a generation state and its output buffers."""
    ...


# MTMD_API void mtmd_gen_state_reset(mtmd_gen_state * state);
@ctypes_function_mtmd("mtmd_gen_state_reset", [mtmd_gen_state_p_ctypes], None)
def mtmd_gen_state_reset(state: mtmd_gen_state_p):
    """Clear decoder state for a cold start, keeping the RNG stream."""
    ...


# MTMD_API int32_t mtmd_gen_state_set_ref(mtmd_context * ctx, mtmd_gen_state * state);
@ctypes_function_mtmd("mtmd_gen_state_set_ref", [mtmd_context_p_ctypes, mtmd_gen_state_p_ctypes], c_int32)
def mtmd_gen_state_set_ref(ctx: mtmd_context_p, state: mtmd_gen_state_p) -> int:
    """Copy the last encoded reference to this model's state; nonzero means failure."""
    ...

# // defaults tuned for the loaded pipeline, callers override only what they care about
# MTMD_API struct mtmd_gen_inp mtmd_gen_inp_default(const mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_gen_inp_default",
    [
        mtmd_context_p_ctypes,
    ],
    mtmd_gen_inp,
)
def mtmd_gen_inp_default(
    ctx: mtmd_context_p,
) -> mtmd_gen_inp:
    """
    defaults tuned for the loaded pipeline, callers override only what they care about
    """
    ...

# // run one step and update the state in place
# // the caller drives the backbone and collects the audio frames
# MTMD_API int32_t mtmd_gen_audio_process(mtmd_context * ctx,
#                                 mtmd_gen_state * state,
#                                 const struct mtmd_gen_inp * inp,
#                                 struct mtmd_gen_out * out);
@ctypes_function_mtmd(
    "mtmd_gen_audio_process",
    [
        mtmd_context_p_ctypes,
        mtmd_gen_state_p_ctypes,
        POINTER(mtmd_gen_inp),
        POINTER(mtmd_gen_out),
    ],
    c_int32,
)
def mtmd_gen_audio_process(
    ctx: mtmd_context_p,
    state: mtmd_gen_state_p,
    inp: POINTER(mtmd_gen_inp),  # type: ignore
    out: POINTER(mtmd_gen_out),  # type: ignore
) -> int:
    """
    Run one step and update state in place; the caller drives the backbone
    and collects the audio frames before the next call with this state.
    """
    ...

# // test function, to be used in test-mtmd-c-api.c
# MTMD_API mtmd_input_chunks * mtmd_test_create_input_chunks(void);
@ctypes_function_mtmd(
    "mtmd_test_create_input_chunks",
    [],
    mtmd_input_chunks_p_ctypes,
)
def mtmd_test_create_input_chunks() -> mtmd_input_chunks_p:
    ...


# //
# // libmtmd helper functions
# //
# // Please note that these helpers are not guaranteed to be stable.
# // BREAKING CHANGES are expected.
# //

# struct mtmd_helper_video;
mtmd_helper_video_p = NewType("mtmd_helper_video_p", int)
mtmd_helper_video_p_ctypes = c_void_p


# struct mtmd_helper_video_init_params {
#     float fps_target;            // desired output fps; <= 0 means use the video's native fps, defaulted to 4.0f
#     const char * ffmpeg_bin_dir; // directory containing ffmpeg/ffprobe binaries; NULL means search PATH
#     int64_t timestamp_interval_ms; // interval for adding timestamp as text chunk (example: "[10m50.5s]"); <= 0 means no timestamp, defaulted to 5000ms
#     bool no_soundtrack; // suppress video audio for models that support it
#     // TODO @ngxson : allow "placeholder" bitmap output for counting tokens
# };
class mtmd_helper_video_init_params(Structure):
    _fields_ = [
        ("fps_target", c_float),
        ("ffmpeg_bin_dir", c_char_p),
        ("timestamp_interval_ms", c_int64),
        ("no_soundtrack", c_bool),
    ]
mtmd_helper_video_init_params_p_ctypes = POINTER(mtmd_helper_video_init_params)


# MTMD_API struct mtmd_helper_video_init_params mtmd_helper_video_init_params_default(void);
@ctypes_function_mtmd(
    "mtmd_helper_video_init_params_default",
    [],
    mtmd_helper_video_init_params,
)
def mtmd_helper_video_init_params_default() -> mtmd_helper_video_init_params:
    """Get the default initialization parameters for mtmd_helper_video."""
    ...


# struct mtmd_helper_init_opt {
#     struct mtmd_helper_video_init_params video_params;
# };
class mtmd_helper_init_opt(Structure):
    _fields_ = [
        ("video_params", mtmd_helper_video_init_params),
    ]
mtmd_helper_init_opt_p_ctypes = POINTER(mtmd_helper_init_opt)


# MTMD_API struct mtmd_helper_init_opt mtmd_helper_init_opt_default(void);
@ctypes_function_mtmd(
    "mtmd_helper_init_opt_default",
    [],
    mtmd_helper_init_opt,
)
def mtmd_helper_init_opt_default() -> mtmd_helper_init_opt:
    """Get the default options for mtmd_helper_bitmap_init_from_*()."""
    ...


# // Set callback for all future logging events.
# // If this is not called, or NULL is supplied, everything is output on stderr.
# // Note: this also call mtmd_log_set() internally
# MTMD_API void mtmd_helper_log_set(ggml_log_callback log_callback, void * user_data);
@ctypes_function_mtmd(
    "mtmd_helper_log_set", [ggml_log_callback, c_void_p], None)
def mtmd_helper_log_set(log_callback: ggml_log_callback, user_data: c_void_p): # type: ignore
    """
    Set callback for all future logging events.
    """
    ...


# // Deprecated: requires both vision support and an MTMD_VIDEO build.
# MTMD_API bool mtmd_helper_support_video(mtmd_context * ctx);
@ctypes_function_mtmd(
    "mtmd_helper_support_video", [mtmd_context_p_ctypes], c_bool)
def mtmd_helper_support_video(ctx: mtmd_context_p) -> c_bool:
    """Deprecated: use mtmd_helper_get_capabilities().video instead."""
    ...


# struct mtmd_helper_bitmap_wrapper {
#     mtmd_bitmap * bitmap;
#     mtmd_helper_video * video_ctx;
# };
class mtmd_helper_bitmap_wrapper(Structure):
    _fields_ = [
        ("bitmap", mtmd_bitmap_p_ctypes),
        ("video_ctx", mtmd_helper_video_p_ctypes),
    ]
mtmd_helper_bitmap_wrapper_p_ctypes = POINTER(mtmd_helper_bitmap_wrapper)

# // helper function to construct a mtmd_bitmap from a file
# // it calls mtmd_helper_bitmap_init_from_buf() internally
# // returns nullptr on failure
# // this function is thread-safe
# MTMD_API struct mtmd_helper_bitmap_wrapper mtmd_helper_bitmap_init_from_file(
#                     mtmd_context * ctx,
#                     const char * fname,
#                     bool placeholder,
#                     struct mtmd_helper_init_opt opt);

@ctypes_function_mtmd(
    "mtmd_helper_bitmap_init_from_file", [
        mtmd_context_p_ctypes,
        c_char_p,
        c_bool,
        mtmd_helper_init_opt,
    ],
    mtmd_helper_bitmap_wrapper
)
def mtmd_helper_bitmap_init_from_file(
    ctx: mtmd_context_p,
    fname: c_char_p,
    placeholder: c_bool,
    opt: mtmd_helper_init_opt,
    /,
) -> mtmd_helper_bitmap_wrapper:
    """
    helper function to construct a mtmd_bitmap from a file
    it calls mtmd_helper_bitmap_init_from_buf() internally
    returns nullptr on failure
    """
    ...


# // helper function to construct a mtmd_bitmap from a buffer containing a file
# // supported formats:
# //     image: formats supported by stb_image: jpg, png, bmp, gif, etc.
# //            webp is decoded via ffmpeg, requires MTMD_VIDEO build with ffmpeg in PATH
# //     audio: formats supported by miniaudio: wav, mp3, flac
# // note:
# //   - for now, video input is only supported via C++ helper functions
# //   - audio files will be auto-detected based on magic bytes
# //   - output bitmap will have SHA-256 hash (hex string) as the ID
# // returns nullptr on failure
# // this function is thread-safe
# MTMD_API struct mtmd_helper_bitmap_wrapper mtmd_helper_bitmap_init_from_buf(
#                     mtmd_context * ctx,
#                     const unsigned char * buf, size_t len,
#                     bool placeholder,
#                     struct mtmd_helper_init_opt opt);
@ctypes_function_mtmd(
    "mtmd_helper_bitmap_init_from_buf", [
        mtmd_context_p_ctypes,
        POINTER(c_uint8),
        c_size_t,
        c_bool,
        mtmd_helper_init_opt,
    ],
    mtmd_helper_bitmap_wrapper
)
def mtmd_helper_bitmap_init_from_buf(
    ctx: mtmd_context_p,
    buf: CtypesArray[c_uint8],
    len: c_size_t,
    placeholder: c_bool,
    opt: mtmd_helper_init_opt,
    /,
) -> mtmd_helper_bitmap_wrapper:
    """
    helper function to construct a mtmd_bitmap from a buffer containing a file
    supported formats:
        image: formats supported by stb_image: jpg, png, bmp, gif, etc.
        audio: formats supported by miniaudio: wav, mp3, flac
    note:
        - for now, video input is only supported via C++ helper functions
        - audio files will be auto-detected based on magic bytes
        - output bitmap will have SHA-256 hash as the ID
    returns nullptr on failure
    """
    ...


# // helper to count the total number of tokens from a list of chunks, useful to keep track of KV cache
# MTMD_API size_t mtmd_helper_get_n_tokens(const mtmd_input_chunks * chunks);
@ctypes_function_mtmd(
    "mtmd_helper_get_n_tokens", [mtmd_input_chunks_p_ctypes], c_size_t)
def mtmd_helper_get_n_tokens(chunks: mtmd_input_chunks_p) -> c_size_t:
    """
    helper to count the total number of tokens from a list of chunks, useful to keep track of KV cache
    """
    ...


# // helper to count the total position of tokens from a list of chunks, useful to keep track of n_past
# // normally, n_pos is equal to n_tokens, but for M-RoPE it is different
# MTMD_API llama_pos mtmd_helper_get_n_pos(const mtmd_input_chunks * chunks);
@ctypes_function_mtmd(
    "mtmd_helper_get_n_pos", [mtmd_input_chunks_p_ctypes], c_int32)
def mtmd_helper_get_n_pos(chunks: mtmd_input_chunks_p) -> c_int32:
    """
    helper to count the total position of tokens from a list of chunks, useful to keep track of n_past
    normally, n_pos is equal to n_tokens, but for M-RoPE it is different
    """
    ...


# // helper to get the list of relative positions corresponding to the embedding tokens, to be used by M-RoPE
# // out_pos must have length == mtmd_helper_get_n_tokens(image)
# MTMD_API void mtmd_helper_image_get_decoder_pos(const mtmd_image_tokens * image, llama_pos pos_0, struct mtmd_decoder_pos * out_pos);
@ctypes_function_mtmd("mtmd_helper_image_get_decoder_pos", [
                        mtmd_image_tokens_p_ctypes,
                        c_int32,
                        mtmd_decoder_pos_p_ctypes,
                    ],
                    None)
def mtmd_helper_image_get_decoder_pos(
    image: mtmd_image_tokens_p,
    pos_0: c_int32,
    out_pos: POINTER(mtmd_decoder_pos) # type: ignore
):
    """
    helper to get the list of relative positions corresponding to the embedding tokens, to be used by M-RoPE
    out_pos must have length == mtmd_helper_get_n_tokens(image)
    """
    ...


# // helper function that automatically:
# // 1. run llama_decode() on text chunks
# // 2. run mtmd_encode_chunk() on image chunks, then mtmd_get_output_embd() and then llama_decode()
# // if any of the mtmd_encode_chunk() or llama_decode() calls return non-zero, stop and forward the error
# // otherwise, returns 0 on success
# // this function is NOT thread-safe
# MTMD_API int32_t mtmd_helper_eval_chunks(mtmd_context * ctx,
#                                          struct llama_context * lctx,
#                                          const mtmd_input_chunks * chunks,
#                                          llama_pos n_past,
#                                          llama_seq_id seq_id,
#                                          int32_t n_batch,
#                                          bool logits_last,
#                                          llama_pos * new_n_past);
@ctypes_function_mtmd(
    "mtmd_helper_eval_chunks", [
        mtmd_context_p_ctypes,
        llama_cpp_lib.llama_context_p_ctypes,
        mtmd_input_chunks_p_ctypes,
        c_int32,
        c_int32,
        c_int32,
        c_bool,
        POINTER(c_int32),
    ],
    c_int32)
def mtmd_helper_eval_chunks(
    ctx: mtmd_context_p,
    lctx: llama_cpp_lib.llama_context_p,
    chunks: mtmd_input_chunks_p,
    n_past: c_int32,
    seq_id: c_int32,
    n_batch: c_int32,
    logits_last: c_bool,
    new_n_past: POINTER(c_int32), # type: ignore
    /,
) -> c_int32:
    """
    helper function that automatically:
    1. run llama_decode() on text chunks
    2. run mtmd_encode() on image chunks, then mtmd_get_output_embd() and then llama_decode()
    if any of the mtmd_encode() or llama_decode() calls return non-zero, stop and forward the error
    otherwise, returns 0 on success
    """
    ...


# // works like mtmd_helper_eval_chunks(), but only for a single chunk
# // this function is NOT thread-safe
# MTMD_API int32_t mtmd_helper_eval_chunk_single(mtmd_context * ctx,
#                                                struct llama_context * lctx,
#                                                const mtmd_input_chunk * chunk,
#                                                llama_pos n_past,
#                                                llama_seq_id seq_id,
#                                                int32_t n_batch,
#                                                bool logits_last,
#                                                llama_pos * new_n_past);
@ctypes_function_mtmd(
    "mtmd_helper_eval_chunk_single", [
        mtmd_context_p_ctypes,
        llama_cpp_lib.llama_context_p_ctypes,
        mtmd_input_chunk_p_ctypes,
        c_int32,
        c_int32,
        c_int32,
        c_bool,
        POINTER(c_int32),
    ],
    c_int32)
def mtmd_helper_eval_chunk_single(
    ctx: mtmd_context_p,
    lctx: llama_cpp_lib.llama_context_p,
    chunks: mtmd_input_chunk_p,
    n_past: c_int32,
    seq_id: c_int32,
    n_batch: c_int32,
    logits_last: c_bool,
    new_n_past: POINTER(c_int32), # type: ignore
    /,
) -> c_int32:
    """
    works like mtmd_helper_eval_chunks(), but only for a single chunk
    """
    ...


class mtmd_helper_embd_batch(Structure):
    """Borrowed embedding sub-batch, valid only during the decode callback.

    ``embd`` has shape [n_tokens, n_embd]; ``pos`` has shape
    [n_pos, n_tokens] in section-major order.
    """

    _fields_ = [
        ("n_tokens", c_int32),
        ("embd", POINTER(c_float)),
        ("n_embd", c_int32),
        ("pos", POINTER(c_int32)),
        ("n_pos", c_int32),
        ("seq_id", c_int32),
    ]


# typedef int32_t (*mtmd_helper_post_decode_callback)(const struct mtmd_helper_embd_batch * batch, void * user_data);
mtmd_helper_post_decode_callback = CFUNCTYPE(
    c_int32,
    POINTER(mtmd_helper_embd_batch),
    c_void_p,
)

# // helper function to decode an image whose embeddings have already been calculated
# // this helper will handle batching and pre/post decoding setup (for ex. gemma 3 requires non-causal attention)
# // ret 0 on success, -1 on chunk not being a valid image chunk, 1 on decode failure
# MTMD_API int32_t mtmd_helper_decode_image_chunk(mtmd_context * ctx,
#                                                 struct llama_context * lctx,
#                                                 const mtmd_input_chunk * chunk,
#                                                 float * encoded_embd,
#                                                 llama_pos n_past,
#                                                 llama_seq_id seq_id,
#                                                 int32_t n_batch,
#                                                 llama_pos * new_n_past,
#                                                 mtmd_helper_post_decode_callback callback,
#                                                 void * user_data);
@ctypes_function_mtmd(
    "mtmd_helper_decode_image_chunk", [
        mtmd_context_p_ctypes,
        llama_cpp_lib.llama_context_p_ctypes,
        mtmd_input_chunk_p_ctypes,
        POINTER(c_float),
        c_int32,
        c_int32,
        c_int32,
        POINTER(c_int32),
        mtmd_helper_post_decode_callback,
        c_void_p,
    ],
    c_int32)
def mtmd_helper_decode_image_chunk(
    ctx: mtmd_context_p,
    lctx: llama_cpp_lib.llama_context_p,
    chunk: mtmd_input_chunk_p,
    encoded_embd: POINTER(c_float), # type: ignore
    n_past: c_int32,
    seq_id: c_int32,
    n_batch: c_int32,
    new_n_past: POINTER(c_int32),   # type: ignore
    callback: Optional[mtmd_helper_post_decode_callback], # type: ignore
    user_data: c_void_p,
    /,
) -> c_int32:
    """
    helper function to decode an image whose embeddings have already been calculated
    this helper will handle batching and pre/post decoding setup (for ex. gemma 3 requires non-causal attention)
    ret 0 on success, -1 on chunk not being a valid image chunk, 1 on decode failure
    """
    ...

# //
# // video input helpers (requires ffmpeg/ffprobe installed on the system)
# // the notion of video only exists at the helper level, it is not visible to the core mtmd library
# //
# // NOTE: this implementation is model-agnostic, it can be used with any vision-capable model
# //       however, it may not be accurate for some specific models
# //       (this is expected for now, to keep the implementation simple)
# //

# struct mtmd_helper_video_info {
#     uint32_t width;
#     uint32_t height;
#     float    fps;      // effective fps (fps_target if set, else original video fps)
#     int32_t  n_frames; // estimated total frames at effective fps (-1 if unknown)
# };
class mtmd_helper_video_info(Structure):
    _fields_ = [
        ("width", c_uint32),
        ("height", c_uint32),
        ("fps", c_float),
        ("n_frames", c_int32),
    ]
mtmd_helper_video_info_p_ctypes = POINTER(mtmd_helper_video_info)


# // returns NULL on failure (ffprobe not found, file unreadable, etc.)
# MTMD_API mtmd_helper_video * mtmd_helper_video_init(
#                     struct mtmd_context * mctx,
#                     const char * path,
#                     struct mtmd_helper_video_init_params params);
@ctypes_function_mtmd(
    "mtmd_helper_video_init", [
        mtmd_context_p_ctypes,
        c_char_p,
        mtmd_helper_video_init_params,
    ],
    mtmd_helper_video_p_ctypes)
def mtmd_helper_video_init(
    mctx: mtmd_context_p,
    path: c_char_p,
    params: mtmd_helper_video_init_params,
    /,
) -> mtmd_helper_video_p:
    """
    helper function to init an mtmd_helper_video object
    returns NULL on failure (ffprobe not found, file unreadable, etc.)
    """
    ...


# // Same as mtmd_helper_video_init(), but reads from an in-memory buffer.
# // The buffer is copied internally; the caller does not need to keep it alive.
# // Note: pipe input is not seekable, so seeking will use output-side seeking
# // (ffmpeg decodes and discards frames up to the target position).
# MTMD_API mtmd_helper_video * mtmd_helper_video_init_from_buf(
#                     struct mtmd_context * mctx,
#                     const unsigned char * buf, size_t len,
#                     struct mtmd_helper_video_init_params params);
@ctypes_function_mtmd(
    "mtmd_helper_video_init_from_buf",
    [
        mtmd_context_p_ctypes,
        POINTER(c_uint8),
        c_size_t,
        mtmd_helper_video_init_params,
    ],
    mtmd_helper_video_p_ctypes,
)
def mtmd_helper_video_init_from_buf(
    mctx: mtmd_context_p,
    buf: CtypesArray[c_uint8],
    len: c_size_t,
    params: mtmd_helper_video_init_params,
    /,
) -> mtmd_helper_video_p:
    """
    helper function to init an mtmd_helper_video object from an in-memory video buffer

    The buffer is copied internally, so the caller does not need to keep it alive
    after this function returns.
    """
    ...


# MTMD_API void mtmd_helper_video_free(mtmd_helper_video * ctx);
@ctypes_function_mtmd("mtmd_helper_video_free", [mtmd_helper_video_p_ctypes], None)
def mtmd_helper_video_free(
    ctx: mtmd_helper_video_p,
    /,
) -> None:
    """
    free an mtmd_helper_video object
    """
    ...


# MTMD_API struct mtmd_helper_video_info mtmd_helper_video_get_info(const mtmd_helper_video * ctx);
@ctypes_function_mtmd("mtmd_helper_video_get_info", [mtmd_helper_video_p_ctypes], mtmd_helper_video_info)
def mtmd_helper_video_get_info(
    ctx: mtmd_helper_video_p,
    /,
) -> mtmd_helper_video_info:
    """
    get video information from an mtmd_helper_video object
    """
    ...


# // Read the next item from the video stream; exactly one of out_bitmap or out_text is set per call.
# // *out_bitmap - heap-allocated; caller must free with mtmd_bitmap_free()
# // *out_text   - heap-allocated (always via strdup/malloc); caller must free with free()
# // returns 0 on success, -1 on EOF, -2 on error
# MTMD_API int32_t mtmd_helper_video_read_next(mtmd_helper_video * ctx,
#             mtmd_bitmap ** out_bitmap,
#             char ** out_text);
@ctypes_function_mtmd(
    "mtmd_helper_video_read_next",
    [
        mtmd_helper_video_p_ctypes,
        POINTER(mtmd_bitmap_p_ctypes),
        POINTER(c_char_p),
    ],
    c_int32,
)
def mtmd_helper_video_read_next(
    ctx: mtmd_helper_video_p,
    out_bitmap: POINTER(mtmd_bitmap_p_ctypes),  # type: ignore
    out_text:   POINTER(c_char_p),              # type: ignore
    /,
) -> int:
    """
    read the next item from the video stream

    Exactly one of out_bitmap or out_text is set per successful call.

    out_bitmap:
        heap-allocated bitmap; caller must free it with mtmd_bitmap_free()

    out_text:
        heap-allocated string via strdup/malloc; caller must free it with free()

    returns:
        0  on success
        -1 on EOF
        -2 on error
    """
    ...

class mtmd_helper_cap(Structure):
    """Input/output capabilities; realtime token delay can disable chat.

    text_gen is false for TTS-only models without a chat template.
    audio_stream describes realtime input, not streaming audio output.
    """

    _fields_ = [
        ("chat", c_bool),
        ("vision", c_bool),
        ("audio", c_bool),
        ("video", c_bool),
        ("audio_stream", c_bool),
        ("text_gen", c_bool),
        ("audio_gen", c_bool),
        ("audio_gen_spk_ref", c_bool),
    ]

    if TYPE_CHECKING:
        chat: bool
        vision: bool
        audio: bool
        video: bool
        audio_stream: bool
        text_gen: bool
        audio_gen: bool
        audio_gen_spk_ref: bool


# MTMD_API struct mtmd_helper_cap mtmd_helper_get_capabilities(const struct llama_model * model, const struct mtmd_context * mctx);
@ctypes_function_mtmd(
    "mtmd_helper_get_capabilities",
    [llama_cpp_lib.llama_model_p_ctypes, mtmd_context_p_ctypes],
    mtmd_helper_cap, required=False,
)
def mtmd_helper_get_capabilities(
    model: llama_cpp_lib.llama_model_p, mctx: mtmd_context_p, /,
) -> mtmd_helper_cap:
    """Return capabilities by value; mctx may be NULL for a text-only model."""
    ...


# // return true if model can be used for chat (deprecated)
# MTMD_API bool mtmd_helper_model_can_chat(struct llama_context * lctx, struct mtmd_context * mctx);
@ctypes_function_mtmd(
    "mtmd_helper_model_can_chat", [
        llama_cpp_lib.llama_context_p_ctypes,
        mtmd_context_p_ctypes,
    ],
    c_bool,
)
def mtmd_helper_model_can_chat(
    lctx: llama_cpp_lib.llama_context_p,
    mctx: mtmd_context_p,
    /,
) -> bool:
    """
    Deprecated: use mtmd_helper_get_capabilities().chat instead.
    """
    ...

# //
# // Audio generation helpers
# // (early-stage experimental, subjected to breaking changes)
# //

# // audio generation helper context
# // contains accumulator for generated audio features and PCM audio
# struct mtmd_helper_gen_audio {
#     std::unique_ptr<mtmd_gen_audio_pipeline> pipeline;
# };
# typedef struct mtmd_helper_gen_audio mtmd_helper_gen_audio;
mtmd_helper_gen_audio_p = NewType("mtmd_helper_gen_audio_p", int)
mtmd_helper_gen_audio_p_ctypes = c_void_p

# enum mtmd_helper_gen_audio_outtype {
#     MTMD_HELPER_GEN_AUDIO_OUTTYPE_PCM, // raw PCM
#     MTMD_HELPER_GEN_AUDIO_OUTTYPE_WAV, // WAV PCM 16-bit LE, mono
# };
class mtmd_helper_gen_audio_outtype(enum.IntEnum):
    MTMD_HELPER_GEN_AUDIO_OUTTYPE_PCM = 0  # raw PCM
    MTMD_HELPER_GEN_AUDIO_OUTTYPE_WAV = 1  # WAV PCM 16-bit LE, mono


class mtmd_helper_gen_audio_out_mode(enum.IntEnum):
    """Output mode when continuing an existing sequence (n_past > 0)."""

    MTMD_HELPER_GEN_AUDIO_OUT_AUTO = 0
    MTMD_HELPER_GEN_AUDIO_OUT_TEXT = 1
    MTMD_HELPER_GEN_AUDIO_OUT_AUDIO = 2
    MTMD_HELPER_GEN_AUDIO_OUT_MIXED = 3

# struct mtmd_helper_gen_audio_inp {
#     bool stream; // if true, output() must be called after each step_gen()
#     llama_seq_id seq_id;
#     const char * prompt;
#     size_t       prompt_len;
#     int32_t n_past; // > 0 continues an existing sequence (LFM3A only)
#     enum mtmd_helper_gen_audio_out_mode out_mode;
#     mtmd_bitmap * speaker_ref; // optional, can be NULL
#     const char * lang; // optional, can be NULL
#     int32_t  top_k;
#     float    top_p;
#     uint32_t seed; // UINT32_MAX for random (default: random)
#     enum mtmd_helper_gen_audio_outtype out_type;
# };
class mtmd_helper_gen_audio_inp(Structure):
    _fields_ = [
        ("stream", c_bool),
        ("seq_id", c_int32),
        ("prompt", c_char_p),
        ("prompt_len", c_size_t),
        ("n_past", c_int32),
        ("out_mode", c_int),
        ("speaker_ref", mtmd_bitmap_p_ctypes),
        ("lang", c_char_p),
        ("top_k", c_int32),
        ("top_p", c_float),
        ("seed", c_uint32),
        ("out_type", c_int),
    ]

    if TYPE_CHECKING:
        stream: bool
        seq_id: int
        prompt: bytes
        prompt_len: int
        n_past: int
        out_mode: int
        speaker_ref: mtmd_bitmap_p
        lang: Optional[bytes]
        top_k: int
        top_p: float
        seed: int
        out_type: int

# MTMD_API struct mtmd_helper_gen_audio_inp mtmd_helper_gen_audio_inp_default(void);
@ctypes_function_mtmd("mtmd_helper_gen_audio_inp_default", [], mtmd_helper_gen_audio_inp)
def mtmd_helper_gen_audio_inp_default() -> mtmd_helper_gen_audio_inp:
    """Return native defaults for audio generation requests."""
    ...


# MTMD_API mtmd_helper_gen_audio * mtmd_helper_gen_audio_init(
#                                     struct llama_context * lctx,
#                                     struct mtmd_context * mctx);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_init",
    [
        llama_cpp_lib.llama_context_p_ctypes,
        mtmd_context_p_ctypes,
    ],
    mtmd_helper_gen_audio_p_ctypes,
)
def mtmd_helper_gen_audio_init(
    lctx: llama_cpp_lib.llama_context_p,
    mctx: mtmd_context_p,
    /,
) -> mtmd_helper_gen_audio_p:
    """
    Initialize the experimental audio generation helper context.
    """
    ...

# MTMD_API void mtmd_helper_gen_audio_free(mtmd_helper_gen_audio * ctx);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_free",
    [mtmd_helper_gen_audio_p_ctypes],
    None,
)
def mtmd_helper_gen_audio_free(
    ctx: mtmd_helper_gen_audio_p,
    /,
):
    ...

# MTMD_API void mtmd_helper_gen_audio_reset(mtmd_helper_gen_audio * ctx);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_reset",
    [mtmd_helper_gen_audio_p_ctypes],
    None,
)
def mtmd_helper_gen_audio_reset(
    ctx: mtmd_helper_gen_audio_p,
    /,
):
    ...

# MTMD_API int32_t mtmd_helper_gen_audio_set_input(
#                         mtmd_helper_gen_audio * ctx,
#                         const struct mtmd_helper_gen_audio_inp * inp);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_set_input",
    [
        mtmd_helper_gen_audio_p_ctypes,
        POINTER(mtmd_helper_gen_audio_inp),
    ],
    c_int32,
)
def mtmd_helper_gen_audio_set_input(
    ctx: mtmd_helper_gen_audio_p,
    inp: POINTER(mtmd_helper_gen_audio_inp),  # type: ignore
    /,
) -> c_int32:
    ...

# // processes at most n_batch prompt tokens per call
# // returns: >0 = number of prompt tokens remaining, 0 = done, <0 = error
# MTMD_API int32_t mtmd_helper_gen_audio_step_prompt(
#                         mtmd_helper_gen_audio * ctx,
#                         int32_t n_batch);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_step_prompt",
    [
        mtmd_helper_gen_audio_p_ctypes,
        c_int32,
    ],
    c_int32,
)
def mtmd_helper_gen_audio_step_prompt(
    ctx: mtmd_helper_gen_audio_p,
    n_batch: c_int32,
    /,
) -> c_int32:
    """
    Process at most n_batch prompt tokens per call.
    Returns: >0 = number of prompt tokens remaining, 0 = done, <0 = error
    """
    ...

# // generates one frame; must only be called after step_prompt() has returned 0
# // sampled can be LLAMA_TOKEN_NULL for pipelines with no discrete backbone token
# // out_stop (optional) is set on end-of-speech, the caller must then stop the loop
# // h_state_out is valid until next step_gen() or reset() call, null if no frame is generated
# MTMD_API int32_t mtmd_helper_gen_audio_step_gen(
#                         mtmd_helper_gen_audio * ctx,
#                         llama_token sampled,
#                         const float *  h_state_in,
#                         const float ** h_state_out,
#                         bool * out_stop);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_step_gen",
    [
        mtmd_helper_gen_audio_p_ctypes,
        llama_cpp_lib.llama_token,
        POINTER(c_float),
        POINTER(POINTER(c_float)),
        POINTER(c_bool),
    ],
    c_int32,
)
def mtmd_helper_gen_audio_step_gen(
    ctx: mtmd_helper_gen_audio_p,
    sampled: llama_cpp_lib.llama_token,
    h_state_in: POINTER(c_float),           # type: ignore
    h_state_out: POINTER(POINTER(c_float)), # type: ignore
    out_stop: POINTER(c_bool),              # type: ignore
    /,
) -> c_int32:
    """
    Generate one audio frame.

    Must only be called after mtmd_helper_gen_audio_step_prompt() returns 0.

    sampled can be LLAMA_TOKEN_NULL for pipelines with no discrete backbone token.

    out_stop (optional) is set on end-of-speech, the caller must then stop the loop.

    h_state_out is owned by the helper context and remains valid until the
    next step_gen() or reset() call, null if no frame is generated.
    """
    ...

# MTMD_API bool mtmd_helper_gen_audio_next_is_text(mtmd_helper_gen_audio * ctx);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_next_is_text", [mtmd_helper_gen_audio_p_ctypes],
    c_bool, required=False,
)
def mtmd_helper_gen_audio_next_is_text(ctx: mtmd_helper_gen_audio_p) -> bool:
    """Whether the next step needs a text token in a text/audio-switching pipeline.

    False does not replace the existing token-sampling rules for Qwen3-TTS
    or Soprano, which still require a sampled token for audio generation.
    """
    ...


# MTMD_API const llama_logit_bias * mtmd_helper_gen_audio_get_logit_bias(mtmd_helper_gen_audio * ctx, size_t * n_bias);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_get_logit_bias",
    [mtmd_helper_gen_audio_p_ctypes, POINTER(c_size_t)],
    POINTER(llama_cpp_lib.llama_logit_bias), required=False,
)
def mtmd_helper_gen_audio_get_logit_bias(
    ctx: mtmd_helper_gen_audio_p, n_bias: _Pointer[c_size_t],
) -> _Pointer[llama_cpp_lib.llama_logit_bias]:
    """Borrow text-token biases; n_bias receives the count, zero returns NULL.

    Copy before resetting, reconfiguring or freeing the helper.
    """
    ...


# MTMD_API int32_t mtmd_helper_audio_stream_get_logit_bias(const mtmd_context * mctx, const struct llama_model * model, llama_logit_bias * out, int32_t n_max);
@ctypes_function_mtmd(
    "mtmd_helper_audio_stream_get_logit_bias",
    [mtmd_context_p_ctypes, llama_cpp_lib.llama_model_p_ctypes,
     POINTER(llama_cpp_lib.llama_logit_bias), c_int32],
    c_int32, required=False,
)
def mtmd_helper_audio_stream_get_logit_bias(
    mctx: mtmd_context_p, model: llama_cpp_lib.llama_model_p,
    out: _Pointer[llama_cpp_lib.llama_logit_bias], n_max: int,
) -> int:
    """Return the total live-ASR bias count, writing at most n_max entries.

    Query with out=NULL, n_max=0, then supply a caller-owned array of that size.
    """
    ...


# // out_data valid until next get_output() or reset() call
# // out_n_samples (optional, can be NULL) receives the number of generated PCM samples
# // in stream mode, returns only new audio; out_data_len is zero until a window is ready
# MTMD_API int32_t mtmd_helper_gen_audio_get_output(
#                         mtmd_helper_gen_audio * ctx,
#                         int32_t * out_sample_rate,
#                         const char ** out_data,
#                         size_t * out_data_len,
#                         int64_t * out_n_samples);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_get_output",
    [
        mtmd_helper_gen_audio_p_ctypes,
        POINTER(c_int32),
        POINTER(c_char_p),
        POINTER(c_size_t),
        POINTER(c_int64),
    ],
    c_int32,
)
def mtmd_helper_gen_audio_get_output(
    ctx: mtmd_helper_gen_audio_p,
    out_sample_rate: POINTER(c_int32),  # type: ignore
    out_data: POINTER(c_char_p),        # type: ignore
    out_data_len: POINTER(c_size_t),    # type: ignore
    out_n_samples: POINTER(c_int64),    # type: ignore
    /,
) -> c_int32:
    """
    Get accumulated generated audio output.

    out_data is owned by the helper context and remains valid until the next
    get_output() or reset() call.

    out_n_samples (optional, can be NULL) receives the number of generated PCM samples.
    In stream mode, returns only new audio; out_data_len is zero until a window is ready.
    """
    ...


# MTMD_API int32_t mtmd_helper_gen_audio_flush(mtmd_helper_gen_audio * ctx);
@ctypes_function_mtmd(
    "mtmd_helper_gen_audio_flush", [mtmd_helper_gen_audio_p_ctypes], c_int32,
)
def mtmd_helper_gen_audio_flush(ctx: mtmd_helper_gen_audio_p, /) -> int:
    """Decode buffered frames; call before the final get_output() in stream mode."""
    ...