55 lines
1.4 KiB
Python
55 lines
1.4 KiB
Python
# RozK
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from . import libav
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from .codec import Codec
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from .stream import NullStream, Stream
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from .packet import Packet
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class Context:
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__slots__ = '_ref'
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def __init__(self):
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self._ref = libav.alloc_context()
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if not self._ref:
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raise MemoryError
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def __del__(self):
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if self._ref:
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libav.free_context(self._ref)
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@property
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def _as_parameter_(self):
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return self._ref
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def open_input(self, url):
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if not self._ref:
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return
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errcode = libav.open_input(self._ref, url)
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if errcode < 0:
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raise Exception(f"Failed to open: {url}")
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errcode = libav.find_stream_info(self._ref)
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if errcode < 0:
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libav.close_input(self._ref)
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raise Exception("Failed to find stream info")
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def close_input(self):
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if self._ref:
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libav.close_input(self._ref)
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def find_stream(self, type):
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if not self._ref:
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return NullStream()
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index, codec_ref = libav.find_best_stream(self._ref, type)
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if index < 0 or not codec_ref:
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return NullStream()
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return Stream(index, Codec(codec_ref))
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def read_packet(self):
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if not self._ref:
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return None
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packet = Packet()
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errcode = libav.read_frame(self._ref, packet)
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if errcode < 0:
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return None
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return packet
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