diff options
| -rw-r--r-- | src/media/UAudioDecoder_FFmpeg.pas | 57 |
1 files changed, 33 insertions, 24 deletions
diff --git a/src/media/UAudioDecoder_FFmpeg.pas b/src/media/UAudioDecoder_FFmpeg.pas index d079afdc..7ca98885 100644 --- a/src/media/UAudioDecoder_FFmpeg.pas +++ b/src/media/UAudioDecoder_FFmpeg.pas @@ -325,6 +325,7 @@ begin //Log.LogStatus('AudioStreamIndex is: '+ inttostr(ffmpegStreamID), 'UAudio_FFmpeg'); AudioStream := FormatCtx.streams[AudioStreamIndex]; + AudioStreamPos := 0; CodecCtx := AudioStream^.codec; // TODO: should we use this or not? Should we allow 5.1 channel audio? @@ -575,30 +576,38 @@ begin PauseParser(); PauseDecoder(); SDL_mutexP(StateLock); - - // configure seek parameters - SeekPos := Time; - SeekFlush := Flush; - SeekFlags := AVSEEK_FLAG_ANY; - SeekRequest := true; - - // Note: the BACKWARD-flag seeks to the first position <= the position - // searched for. Otherwise e.g. position 0 might not be seeked correct. - // For some reason ffmpeg sometimes doesn't use position 0 but the key-frame - // following. In streams with few key-frames (like many flv-files) the next - // key-frame after 0 might be 5secs ahead. - if (Time < AudioStreamPos) then - SeekFlags := SeekFlags or AVSEEK_FLAG_BACKWARD; - - EOFState := false; - ErrorState := false; - - // send a reuse signal in case the parser was stopped (e.g. because of an EOF) - SDL_CondSignal(ParserIdleCond); - - SDL_mutexV(StateLock); - ResumeDecoder(); - ResumeParser(); + try + EOFState := false; + ErrorState := false; + + // do not seek if we are already at the correct position. + // This is important especially for seeking to position 0 if we already are + // at the beginning. Although seeking with AVSEEK_FLAG_BACKWARD for pos 0 works, + // it is still a bit choppy (although much better than w/o AVSEEK_FLAG_BACKWARD). + if (Time = AudioStreamPos) then + Exit; + + // configure seek parameters + SeekPos := Time; + SeekFlush := Flush; + SeekFlags := AVSEEK_FLAG_ANY; + SeekRequest := true; + + // Note: the BACKWARD-flag seeks to the first position <= the position + // searched for. Otherwise e.g. position 0 might not be seeked correct. + // For some reason ffmpeg sometimes doesn't use position 0 but the key-frame + // following. In streams with few key-frames (like many flv-files) the next + // key-frame after 0 might be 5secs ahead. + if (Time <= AudioStreamPos) then + SeekFlags := SeekFlags or AVSEEK_FLAG_BACKWARD; + + // send a reuse signal in case the parser was stopped (e.g. because of an EOF) + SDL_CondSignal(ParserIdleCond); + finally + SDL_mutexV(StateLock); + ResumeDecoder(); + ResumeParser(); + end; // in blocking mode, wait until seeking is done if (Blocking) then |