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decoder multithreading

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This commit is contained in:
Roz K
2025-10-04 17:39:37 +02:00
parent 04448df101
commit 639a20bca9
3 changed files with 151 additions and 9 deletions
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5
pyav/decoder.py
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@ -21,7 +21,7 @@ from .frame import Frame
class Decoder:
__slots__ = '_context'
def __init__(self, stream):
def __init__(self, stream, thread_count):
self._context = libav.codec_alloc_context(stream.codec)
if not self._context:
raise MemoryError
@ -29,6 +29,9 @@ class Decoder:
if errcode < 0:
libav.codec_free_context(self._context)
raise Exception("Failed to set context parameters")
if thread_count > 1:
self._context.contents.thread_count = thread_count
self._context.contents.thread_type = libav.FF_THREAD_FRAME
errcode = libav.codec_open(self._context, stream.codec)
if errcode < 0:
libav.codec_free_context(self._context)

136
pyav/libav.py
View File

@ -49,6 +49,9 @@ AVMEDIA_TYPE_ATTACHMENT = 4
AV_NUM_DATA_POINTERS = 8
FF_THREAD_FRAME = 1
FF_THREAD_SLICE = 2
c_uint8_p = ctypes.POINTER(ctypes.c_uint8)
c_uint8_pp = ctypes.POINTER(c_uint8_p)
@ -143,8 +146,139 @@ class AVCodec(ctypes.Structure):
AVCodec_p = ctypes.POINTER(AVCodec)
AVCodec_pp = ctypes.POINTER(AVCodec_p)
class AVChannelLayout_u(ctypes.Union):
_fields_ = [
("mask", ctypes.c_uint64),
("map", ctypes.c_void_p)] # AVChannelCustom
class AVChannelLayout(ctypes.Structure):
_fields_ = [
("order", ctypes.c_int), # AVChannelOrder
("nb_channels", ctypes.c_int),
("u", AVChannelLayout_u),
("opaque", ctypes.c_void_p)]
class AVCodecContext(ctypes.Structure):
pass
_fields_ = [
("av_class", ctypes.c_void_p),
("log_level_offset", ctypes.c_int),
("codec_type", ctypes.c_int),
("codec", AVCodec_p),
("codec_id", ctypes.c_int),
("codec_tag", ctypes.c_uint),
("priv_data", ctypes.c_void_p),
("internal", ctypes.c_void_p), # AVCodecInternal
("opaque", ctypes.c_void_p),
("bit_rate", ctypes.c_int64),
("flags", ctypes.c_int),
("flags2", ctypes.c_int),
("extradata", ctypes.POINTER(ctypes.c_uint8)),
("extradata_size", ctypes.c_int),
("time_base", AVRational),
("pkt_timebase", AVRational),
("framerate", AVRational),
("delay", ctypes.c_int),
("width", ctypes.c_int),
("height", ctypes.c_int),
("coded_width", ctypes.c_int),
("coded_height", ctypes.c_int),
("sample_aspect_ratio", AVRational),
("pix_fmt", ctypes.c_int), # AVPixelFormat
("sw_pix_fmt", ctypes.c_int), # AVPixelFormat
("color_primaries", ctypes.c_int), # AVColorPrimaries
("color_trc", ctypes.c_int), # AVColorTransferCharacteristic
("colorspace", ctypes.c_int), # AVColorSpace
("color_range", ctypes.c_int), # AVColorRange
("chroma_sample_location", ctypes.c_int), # AVChromaLocation
("field_order", ctypes.c_int), # AVFieldOrder
("refs", ctypes.c_int),
("has_b_frames", ctypes.c_int),
("slice_flags", ctypes.c_int),
("draw_horiz_band", ctypes.c_void_p),
("get_format", ctypes.c_void_p),
("max_b_frames", ctypes.c_int),
("b_quant_factor", ctypes.c_float),
("b_quant_offset", ctypes.c_float),
("i_quant_factor", ctypes.c_float),
("i_quant_offset", ctypes.c_float),
("lumi_masking", ctypes.c_float),
("temporal_cplx_masking", ctypes.c_float),
("spatial_cplx_masking", ctypes.c_float),
("p_masking", ctypes.c_float),
("dark_masking", ctypes.c_float),
("nsse_weight", ctypes.c_int),
("me_cmp", ctypes.c_int),
("me_sub_cmp", ctypes.c_int),
("mb_cmp", ctypes.c_int),
("ildct_cmp", ctypes.c_int),
("dia_size", ctypes.c_int),
("last_predictor_count", ctypes.c_int),
("me_pre_cmp", ctypes.c_int),
("pre_dia_size", ctypes.c_int),
("me_subpel_quality", ctypes.c_int),
("me_range", ctypes.c_int),
("mb_decision", ctypes.c_int),
("intra_matrix", ctypes.POINTER(ctypes.c_uint16)),
("inter_matrix", ctypes.POINTER(ctypes.c_uint16)),
("chroma_intra_matrix", ctypes.POINTER(ctypes.c_uint16)),
("intra_dc_precision", ctypes.c_int),
("mb_lmin", ctypes.c_int),
("mb_lmax", ctypes.c_int),
("bidir_refine", ctypes.c_int),
("keyint_min", ctypes.c_int),
("gop_size", ctypes.c_int),
("mv0_threshold", ctypes.c_int),
("slices", ctypes.c_int),
("sample_rate", ctypes.c_int),
("sample_fmt", ctypes.c_int), # AVSampleFormat
("ch_layout", AVChannelLayout),
("frame_size", ctypes.c_int),
("block_align", ctypes.c_int),
("cutoff", ctypes.c_int),
("audio_service_type", ctypes.c_int), # AVAudioServiceType
("request_sample_fmt", ctypes.c_int), # AVSampleFormat
("initial_padding", ctypes.c_int),
("trailing_padding", ctypes.c_int),
("seek_preroll", ctypes.c_int),
("get_buffer2", ctypes.c_void_p),
("bit_rate_tolerance", ctypes.c_int),
("global_quality", ctypes.c_int),
("compression_level", ctypes.c_int),
("qcompress", ctypes.c_float),
("qblur", ctypes.c_float),
("qmin", ctypes.c_int),
("qmax", ctypes.c_int),
("max_qdiff", ctypes.c_int),
("rc_buffer_size", ctypes.c_int),
("rc_override_count", ctypes.c_int),
("rc_override", ctypes.c_void_p), # RcOverride
("rc_max_rate", ctypes.c_int64),
("rc_min_rate", ctypes.c_int64),
("rc_max_available_vbv_use", ctypes.c_float),
("rc_min_vbv_overflow_use", ctypes.c_float),
("rc_initial_buffer_occupancy", ctypes.c_int),
("trellis", ctypes.c_int),
("stats_out", ctypes.c_char_p),
("stats_in", ctypes.c_char_p),
("workaround_bugs", ctypes.c_int),
("strict_std_compliance", ctypes.c_int),
("error_concealment", ctypes.c_int),
("debug", ctypes.c_int),
("err_recognition", ctypes.c_int),
("hwaccel", ctypes.c_void_p), # AVHWAccel
("hwaccel_context", ctypes.c_void_p),
("hw_frames_ctx", ctypes.c_void_p), # AVBufferRef
("hw_device_ctx", ctypes.c_void_p), # AVBufferRef
("hwaccel_flags", ctypes.c_int),
("extra_hw_frames", ctypes.c_int),
("error", ctypes.c_uint64 * AV_NUM_DATA_POINTERS),
("dct_algo", ctypes.c_int),
("idct_algo", ctypes.c_int),
("bits_per_coded_sample", ctypes.c_int),
("bits_per_raw_sample", ctypes.c_int),
("thread_count", ctypes.c_int),
("thread_type", ctypes.c_int)]
# ...
AVCodecContext_p = ctypes.POINTER(AVCodecContext)
AVCodecContext_pp = ctypes.POINTER(AVCodecContext_p)