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decoder/ffmpeg: check for commands earlier

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Improve initial seek by not reading/decoding the first frame before
checking for the seek command.
This commit is contained in:
Max Kellermann 2015-06-22 14:41:44 +02:00
parent 62f7375804
commit 4dd2ad9b27
1 changed files with 22 additions and 23 deletions
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45
src/decoder/plugins/FfmpegDecoderPlugin.cxx
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@ -478,8 +478,27 @@ ffmpeg_decode(Decoder &decoder, InputStream &input)
uint64_t min_frame = 0; uint64_t min_frame = 0;
DecoderCommand cmd; DecoderCommand cmd = decoder_get_command(decoder);
do { while (cmd != DecoderCommand::STOP) {
if (cmd == DecoderCommand::SEEK) {
int64_t where =
ToFfmpegTime(decoder_seek_time(decoder),
av_stream.time_base) +
start_time_fallback(av_stream);
/* AVSEEK_FLAG_BACKWARD asks FFmpeg to seek to
the packet boundary before the seek time
stamp, not after */
if (av_seek_frame(format_context, audio_stream, where,
AVSEEK_FLAG_ANY|AVSEEK_FLAG_BACKWARD) < 0)
decoder_seek_error(decoder);
else {
avcodec_flush_buffers(codec_context);
min_frame = decoder_seek_where_frame(decoder);
decoder_command_finished(decoder);
}
}
AVPacket packet; AVPacket packet;
if (av_read_frame(format_context, &packet) < 0) if (av_read_frame(format_context, &packet) < 0)
/* end of file */ /* end of file */
@ -502,27 +521,7 @@ ffmpeg_decode(Decoder &decoder, InputStream &input)
#else #else
av_free_packet(&packet); av_free_packet(&packet);
#endif #endif
}
if (cmd == DecoderCommand::SEEK) {
int64_t where =
ToFfmpegTime(decoder_seek_time(decoder),
av_stream.time_base) +
start_time_fallback(av_stream);
/* AVSEEK_FLAG_BACKWARD asks FFmpeg to seek to
the packet boundary before the seek time
stamp, not after */
if (av_seek_frame(format_context, audio_stream, where,
AVSEEK_FLAG_ANY|AVSEEK_FLAG_BACKWARD) < 0)
decoder_seek_error(decoder);
else {
avcodec_flush_buffers(codec_context);
min_frame = decoder_seek_where_frame(decoder);
decoder_command_finished(decoder);
}
}
} while (cmd != DecoderCommand::STOP);
#if LIBAVUTIL_VERSION_MAJOR >= 53 #if LIBAVUTIL_VERSION_MAJOR >= 53
av_frame_free(&frame); av_frame_free(&frame);