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osxaudiosrc: Set sample timestamps

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Set the timestamp on output buffers based on the incoming sample
times from Core Audio

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5140>
This commit is contained in:
Jan Schmidt 2023-07-26 00:21:08 +10:00 committed by GStreamer Marge Bot
parent 8b1500d7ff
commit 2df9283d3f
1 changed files with 15 additions and 0 deletions
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15
subprojects/gst-plugins-good/sys/osxaudio/gstosxaudiosrc.c
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@ -339,6 +339,12 @@ gst_osx_audio_src_io_proc (GstOsxAudioRingBuffer * buf,
gint remaining;
UInt32 n;
gint offset = 0;
guint64 sample_position;
GstAudioRingBufferSpec *spec = &GST_AUDIO_RING_BUFFER (buf)->spec;
guint bpf = GST_AUDIO_INFO_BPF (&spec->info);
GST_LOG_OBJECT (buf, "in sample position %f frames %u",
inTimeStamp->mSampleTime, inNumberFrames);
/* Previous invoke of AudioUnitRender changed mDataByteSize into
* number of bytes actually read. Reset the members. */
@ -359,6 +365,7 @@ gst_osx_audio_src_io_proc (GstOsxAudioRingBuffer * buf,
* not just the first one. */
remaining = buf->core_audio->recBufferList->mBuffers[0].mDataByteSize;
sample_position = inTimeStamp->mSampleTime;
while (remaining) {
if (!gst_audio_ring_buffer_prepare_read (GST_AUDIO_RING_BUFFER (buf),
@ -377,8 +384,16 @@ gst_osx_audio_src_io_proc (GstOsxAudioRingBuffer * buf,
buf->segoffset += len;
offset += len;
remaining -= len;
sample_position += len / bpf;
if ((gint) buf->segoffset == GST_AUDIO_RING_BUFFER (buf)->spec.segsize) {
/* Calculate the timestamp corresponding to the first sample in the segment */
guint64 seg_sample_pos = sample_position - (spec->segsize / bpf);
GstClockTime ts = gst_util_uint64_scale_int (seg_sample_pos, GST_SECOND,
GST_AUDIO_INFO_RATE (&spec->info));
gst_audio_ring_buffer_set_timestamp (GST_AUDIO_RING_BUFFER (buf),
writeseg, ts);
/* we wrote one segment */
gst_audio_ring_buffer_advance (GST_AUDIO_RING_BUFFER (buf), 1);