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Since SDL has no audio buffer fullness info, one can get a much precise audio clock based on the last time of the audio callback and the elapsed time since. To achieve this I introduced the audio_current_pts and audio_current_pts_drift variables (similar to video_current_pts and video_current_pts_drift) and calculate them in the end of the audio callback, when VideoState->audio_clock is already updated. The reference time I use is from the start of the audio callback, because this way the amount of time used for audio decoding is not interfereing with calculation. I also replaced the audio_write_get_buf_size function with a calculated variable because when the audio frame decoding is in progress audio_buf_size and audio_buf_index are not stable, so using them from other threads are not a good idea. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
FFmpeg README ------------- 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.