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ffmpegenc: more consideration for upstream (audio) timestamps

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This commit is contained in:
Mark Nauwelaerts 2009-12-14 21:20:53 +01:00
parent 4644b7710b
commit 8236e74ca4
1 changed files with 26 additions and 0 deletions
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26
ext/ffmpeg/gstffmpegenc.c
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@ -863,6 +863,9 @@ gst_ffmpegenc_chain_audio (GstPad * pad, GstBuffer * inbuf)
ffmpegenc->adapter_ts = timestamp;
ffmpegenc->adapter_consumed = 0;
} else {
GstClockTime upstream_time;
guint64 bytes;
/* use timestamp at head of the adapter */
GST_LOG_OBJECT (ffmpegenc, "taking adapter timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (ffmpegenc->adapter_ts));
@ -870,6 +873,29 @@ gst_ffmpegenc_chain_audio (GstPad * pad, GstBuffer * inbuf)
timestamp +=
gst_util_uint64_scale (ffmpegenc->adapter_consumed, GST_SECOND,
ctx->sample_rate);
/* check with upstream timestamps, if too much deviation,
* forego some timestamp perfection in favour of upstream syncing
* (particularly in case these do not happen to come in multiple
* of frame size) */
upstream_time = gst_adapter_prev_timestamp (ffmpegenc->adapter, &bytes);
if (GST_CLOCK_TIME_IS_VALID (upstream_time)) {
GstClockTimeDiff diff;
upstream_time +=
gst_util_uint64_scale (bytes, GST_SECOND, ctx->sample_rate);
diff = upstream_time - timestamp;
/* relaxed difference, rather than half a sample or so ... */
if (diff > GST_SECOND / 10 || diff < -GST_SECOND / 10) {
GST_DEBUG_OBJECT (ffmpegenc, "adapter timestamp drifting, "
"taking upstream timestamp %" GST_TIME_FORMAT,
GST_TIME_ARGS (upstream_time));
timestamp = upstream_time;
ffmpegenc->adapter_ts = upstream_time -
gst_util_uint64_scale (bytes, GST_SECOND, ctx->sample_rate);
ffmpegenc->adapter_consumed = bytes;
ffmpegenc->discont = TRUE;
}
}
}
GST_LOG_OBJECT (ffmpegenc, "pushing buffer in adapter");