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ext/vorbis/vorbisenc.*: Handle discontinuities in the input vorbis stream correctly, so that the output is properly t...

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Original commit message from CVS:
* ext/vorbis/vorbisenc.c: (gst_vorbis_enc_generate_sink_caps),
(gst_vorbis_enc_sink_getcaps), (gst_vorbis_enc_buffer_from_packet),
(gst_vorbis_enc_push_buffer),
(gst_vorbis_enc_buffer_check_discontinuous),
(gst_vorbis_enc_chain), (gst_vorbis_enc_change_state):
* ext/vorbis/vorbisenc.h:
Handle discontinuities in the input vorbis stream correctly,
so that the output is properly timestamped (and has good granulepos
values). Needs some oggmux fixes too.
This commit is contained in:
Michael Smith 2006-07-28 12:48:21 +00:00
parent 2a872ad81d
commit 48b860035b
3 changed files with 86 additions and 0 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
2006-07-28 Michael Smith <msmith@fluendo.com>
* ext/vorbis/vorbisenc.c: (gst_vorbis_enc_generate_sink_caps),
(gst_vorbis_enc_sink_getcaps), (gst_vorbis_enc_buffer_from_packet),
(gst_vorbis_enc_push_buffer),
(gst_vorbis_enc_buffer_check_discontinuous),
(gst_vorbis_enc_chain), (gst_vorbis_enc_change_state):
* ext/vorbis/vorbisenc.h:
Handle discontinuities in the input vorbis stream correctly,
so that the output is properly timestamped (and has good granulepos
values). Needs some oggmux fixes too.
2006-07-27 Wim Taymans <wim@fluendo.com>
patch by: Kai Vehmanen <kv2004 eca cx>

72
ext/vorbis/vorbisenc.c
View file

@ -899,6 +899,11 @@ gst_vorbis_enc_buffer_from_packet (GstVorbisEnc * vorbisenc,
GST_BUFFER_DURATION (outbuf) =
vorbisenc->next_ts - GST_BUFFER_TIMESTAMP (outbuf);
if (vorbisenc->next_discont) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
vorbisenc->next_discont = FALSE;
}
GST_LOG_OBJECT (vorbisenc, "encoded buffer of %d bytes",
GST_BUFFER_SIZE (outbuf));
return outbuf;
@ -932,6 +937,8 @@ gst_vorbis_enc_push_buffer (GstVorbisEnc * vorbisenc, GstBuffer * buffer)
{
vorbisenc->bytes_out += GST_BUFFER_SIZE (buffer);
GST_DEBUG_OBJECT (vorbisenc, "Pushing buffer with GP %lld",
GST_BUFFER_OFFSET_END (buffer));
return gst_pad_push (vorbisenc->srcpad, buffer);
}
@ -1027,6 +1034,33 @@ gst_vorbis_enc_sink_event (GstPad * pad, GstEvent * event)
return res;
}
static gboolean
gst_vorbis_enc_buffer_check_discontinuous (GstVorbisEnc * vorbisenc,
GstBuffer * buffer)
{
gboolean ret = FALSE;
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
GST_DEBUG_OBJECT (vorbisenc, "Discont set on incoming buffer");
ret = TRUE;
} else if (vorbisenc->expected_ts != GST_CLOCK_TIME_NONE &&
GST_BUFFER_TIMESTAMP (buffer) != vorbisenc->expected_ts) {
GST_DEBUG_OBJECT (vorbisenc, "Expected TS % " GST_TIME_FORMAT
", buffer TS % " GST_TIME_FORMAT,
GST_TIME_ARGS (vorbisenc->expected_ts),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
ret = TRUE;
}
if (vorbisenc->expected_ts != GST_CLOCK_TIME_NONE) {
vorbisenc->expected_ts = GST_BUFFER_TIMESTAMP (buffer) +
GST_BUFFER_DURATION (buffer);
} else
vorbisenc->expected_ts = GST_CLOCK_TIME_NONE;
return ret;
}
static GstFlowReturn
gst_vorbis_enc_chain (GstPad * pad, GstBuffer * buffer)
{
@ -1037,6 +1071,7 @@ gst_vorbis_enc_chain (GstPad * pad, GstBuffer * buffer)
gulong i, j;
float **vorbis_buffer;
GstBuffer *buf1, *buf2, *buf3;
gboolean first = FALSE;
vorbisenc = GST_VORBISENC (GST_PAD_PARENT (pad));
@ -1099,6 +1134,7 @@ gst_vorbis_enc_chain (GstPad * pad, GstBuffer * buffer)
/* now adjust starting granulepos accordingly if the buffer's timestamp is
nonzero */
vorbisenc->next_ts = GST_BUFFER_TIMESTAMP (buffer);
vorbisenc->expected_ts = GST_BUFFER_TIMESTAMP (buffer);
vorbisenc->granulepos_offset = gst_util_uint64_scale
(GST_BUFFER_TIMESTAMP (buffer), vorbisenc->frequency, GST_SECOND);
vorbisenc->subgranule_offset = 0;
@ -1106,6 +1142,41 @@ gst_vorbis_enc_chain (GstPad * pad, GstBuffer * buffer)
vorbisenc->next_ts - granulepos_to_timestamp_offset (vorbisenc, 0);
vorbisenc->header_sent = TRUE;
first = TRUE;
}
if (vorbisenc->expected_ts != GST_CLOCK_TIME_NONE &&
GST_BUFFER_TIMESTAMP (buffer) < vorbisenc->expected_ts) {
GST_WARNING_OBJECT (vorbisenc, "Buffer is older than previous "
"timestamp + duration, cannot handle. Dropping buffer.");
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
if (gst_vorbis_enc_buffer_check_discontinuous (vorbisenc, buffer) && !first) {
GST_WARNING_OBJECT (vorbisenc, "Buffer is discontinuous, flushing encoder "
"and restarting (Discont from %" GST_TIME_FORMAT
" to %" GST_TIME_FORMAT ")", GST_TIME_ARGS (vorbisenc->next_ts),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
/* Re-initialise encoder (there's unfortunately no API to flush it) */
if ((ret = gst_vorbis_enc_clear (vorbisenc)) != GST_FLOW_OK)
return ret;
if (!gst_vorbis_enc_setup (vorbisenc))
return GST_FLOW_ERROR; /* Should be impossible, we can only get here if
we successfully initialised earlier */
/* Now, set our granulepos offset appropriately. */
vorbisenc->next_ts = GST_BUFFER_TIMESTAMP (buffer);
/* We need to round to the nearest whole number of samples, not just do
* a truncating division here */
vorbisenc->granulepos_offset = gst_util_uint64_scale
(GST_BUFFER_TIMESTAMP (buffer) + GST_SECOND / vorbisenc->frequency / 2
- vorbisenc->subgranule_offset, vorbisenc->frequency, GST_SECOND);
vorbisenc->header_sent = TRUE;
/* And our next output buffer must have DISCONT set on it */
vorbisenc->next_discont = TRUE;
}
/* data to encode */
@ -1304,6 +1375,7 @@ gst_vorbis_enc_change_state (GstElement * element, GstStateChange transition)
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
vorbisenc->setup = FALSE;
vorbisenc->next_discont = FALSE;
vorbisenc->header_sent = FALSE;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:

2
ext/vorbis/vorbisenc.h
View file

@ -76,6 +76,8 @@ struct _GstVorbisEnc {
guint64 samples_in;
guint64 bytes_out;
GstClockTime next_ts;
GstClockTime expected_ts;
gboolean next_discont;
guint64 granulepos_offset;
gint64 subgranule_offset;