47 lines
1.3 KiB
Python
47 lines
1.3 KiB
Python
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# RozK
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import errno
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from . import libav
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from .frame import Frame
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class Decoder:
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__slots__ = '_ref'
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def __init__(self, codec):
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self._ref = libav.codec_alloc_context(codec)
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if not self._ref:
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raise MemoryError
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errcode = libav.codec_open(self._ref, codec)
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if errcode < 0:
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libav.codec_free_context(self._ref)
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raise Exception("Failed to open codec context")
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def __del__(self):
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if self._ref:
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libav.codec_free_context(self._ref)
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def _recieve(self, frames):
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while True:
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frame = Frame()
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errcode = libav.codec_receive_frame(self._ref, frame)
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if errcode == 0:
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frames.append(frame)
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elif errcode == errno.EAGAIN:
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break
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else:
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raise Exception(f"Failed to receive frame: {errcode}")
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def decode(self, packet):
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if not self._ref:
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return None
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frames = []
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while True:
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errcode = libav.codec_send_packet(self._ref, packet)
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if errcode != 0 and errcode != errno.EAGAIN:
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raise Exception(f"Failed to send packet: {errcode}")
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self._recieve(frames)
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if errcode == 0:
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break
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return frames
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