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ffmpeg_decoder: signal EOF/errors on readPacket

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openmw with ffmpeg 5 would hang in an infinite loop trying to read at end of
files in avformat_open_input()
avio_read() apparently now no longer handlers 0 as a return value to signal
EOF and we need ot explicitly return AVERROR_EOF; their documentation
explicitely states "For stream protocols, must never return 0 but rather
a proper AVERROR code." for avio_alloc_context's read_context.

Also fix the exception case to return AVERROR_UNKNOWN -- I assume we'd
otherwise get stuck there too, but I don't know what would trigger this
case.

Fixes #6631
This commit is contained in:
Dominique Martinet 2022-05-28 13:43:37 +09:00
parent 42718f69dc
commit c5cdb0c277
2 changed files with 6 additions and 2 deletions
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1
CHANGELOG.md
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@ -109,6 +109,7 @@
Bug #6606: Quests with multiple IDs cannot always be restarted
Bug #6653: With default settings the in-game console doesn't fit into screen
Bug #6655: Constant effect absorb attribute causes the game to break
Bug #6631: Fix ffmpeg avio API usage causing hangs in ffmpeg version 5
Bug #6667: Pressing the Esc key while resting or waiting causes black screen.
Bug #6670: Dialogue order is incorrect
Bug #6680: object.cpp handles nodetree unsafely, memory access with dangling pointer

7
apps/openmw/mwsound/ffmpeg_decoder.cpp
View File

@ -18,11 +18,14 @@ int FFmpeg_Decoder::readPacket(void *user_data, uint8_t *buf, int buf_size)
std::istream& stream = *static_cast<FFmpeg_Decoder*>(user_data)->mDataStream;
stream.clear();
stream.read((char*)buf, buf_size);
return stream.gcount();
std::streamsize count = stream.gcount();
if (count == 0)
return AVERROR_EOF;
return count;
}
catch (std::exception& )
{
return 0;
return AVERROR_UNKNOWN;
}
}