113 lines
3.2 KiB
Python
113 lines
3.2 KiB
Python
# RozK
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# https://www.ffmpeg.org/doxygen/trunk/group__libavf.html
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import ctypes
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_avformat = ctypes.cdll.LoadLibrary('libavformat.so')
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_avcodec = ctypes.cdll.LoadLibrary('libavcodec.so')
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class AVFormatContext(ctypes.Structure):
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pass
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AVFormatContext_p = ctypes.POINTER(AVFormatContext)
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AVFormatContext_pp = ctypes.POINTER(AVFormatContext_p)
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_avformat.avformat_alloc_context.restype = AVFormatContext_p
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_avformat.avformat_alloc_context.argtypes = None
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def alloc_context():
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return _avformat.avformat_alloc_context()
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_avformat.avformat_free_context.restype = None
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_avformat.avformat_free_context.argtypes = [AVFormatContext_p] # context
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def free_context(context):
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_avformat.avformat_free_context(context)
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_avformat.avformat_open_input.restype = ctypes.c_int
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_avformat.avformat_open_input.argtypes = [
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AVFormatContext_pp, # context
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ctypes.c_char_p, # url
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ctypes.c_void_p, # format
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ctypes.POINTER(ctypes.c_void_p)] # options
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def open_input(context, url):
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return _avformat.avformat_open_input(ctypes.byref(context), url.encode('ascii', 'ignore'), None, None)
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_avformat.avformat_close_input.restype = None
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_avformat.avformat_close_input.argtypes = [AVFormatContext_pp] # context
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def close_input(context):
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_avformat.avformat_close_input(ctypes.byref(context))
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_avformat.avformat_find_stream_info.restype = ctypes.c_int
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_avformat.avformat_find_stream_info.argtypes = [
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AVFormatContext_p, # context
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ctypes.POINTER(ctypes.c_void_p)] # options
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def find_stream_info(context):
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return _avformat.avformat_find_stream_info(context, None)
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AVMEDIA_TYPE_UNKNOWN = -1
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AVMEDIA_TYPE_VIDEO = 0
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AVMEDIA_TYPE_AUDIO = 1
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AVMEDIA_TYPE_DATA = 2
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AVMEDIA_TYPE_SUBTITLE = 3
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AVMEDIA_TYPE_ATTACHMENT = 4
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class AVCodec(ctypes.Structure):
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_fields_ = [
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("name", ctypes.c_char_p),
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("long_name", ctypes.c_char_p)]
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# ...
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AVCodec_p = ctypes.POINTER(AVCodec)
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AVCodec_pp = ctypes.POINTER(AVCodec_p)
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_avformat.av_find_best_stream.restype = ctypes.c_int
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_avformat.av_find_best_stream.argtypes = [
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AVFormatContext_p, # context
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ctypes.c_int, # type
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ctypes.c_int, # wanted stream
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ctypes.c_int, # related stream
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AVCodec_pp, # decoder
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ctypes.c_int] # flags
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def find_best_stream(context, type):
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codec = AVCodec_p()
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index = _avformat.av_find_best_stream(context, type, -1, -1, ctypes.byref(codec), 0)
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return index, codec
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class AVPacket(ctypes.Structure):
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_fields_ = [
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("buf", ctypes.c_void_p),
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("pts", ctypes.c_int64),
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("dts", ctypes.c_int64),
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("data", ctypes.c_void_p),
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("size", ctypes.c_int),
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("stream_index", ctypes.c_int)]
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# ...
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AVPacket_p = ctypes.POINTER(AVPacket)
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AVPacket_pp = ctypes.POINTER(AVPacket_p)
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_avformat.av_packet_alloc.restype = AVPacket_p
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_avformat.av_packet_alloc.argtypes = None
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def packet_alloc():
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return _avformat.av_packet_alloc()
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_avformat.av_packet_free.restype = None
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_avformat.av_packet_free.argtypes = [AVPacket_pp] # packet
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def packet_free(packet):
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_avformat.av_packet_free(ctypes.byref(packet))
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_avformat.av_read_frame.restype = ctypes.c_int
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_avformat.av_read_frame.argtypes = [
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AVFormatContext_p, # context
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AVPacket_p] # packet
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def read_frame(context, packet):
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return _avformat.av_read_frame(context, packet)
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