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ext/vorbis/vorbisdec.*: First stab at vorbis reverse playback.

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Original commit message from CVS:
* ext/vorbis/vorbisdec.c: (vorbis_dec_sink_event),
(vorbis_dec_push_forward), (vorbis_dec_push_reverse),
(vorbis_handle_data_packet), (vorbis_dec_decode_buffer),
(vorbis_dec_flush_decode), (vorbis_dec_chain_reverse),
(vorbis_dec_chain_forward), (vorbis_dec_chain):
* ext/vorbis/vorbisdec.h:
First stab at vorbis reverse playback.
This commit is contained in:
Wim Taymans 2006-11-13 18:14:48 +00:00
parent 0990cbf274
commit cadc881165
3 changed files with 290 additions and 55 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2006-11-13 Wim Taymans <wim@fluendo.com>
* ext/vorbis/vorbisdec.c: (vorbis_dec_sink_event),
(vorbis_dec_push_forward), (vorbis_dec_push_reverse),
(vorbis_handle_data_packet), (vorbis_dec_decode_buffer),
(vorbis_dec_flush_decode), (vorbis_dec_chain_reverse),
(vorbis_dec_chain_forward), (vorbis_dec_chain):
* ext/vorbis/vorbisdec.h:
First stab at vorbis reverse playback.
2006-11-13 Wim Taymans <wim@fluendo.com>
* gst-libs/gst/audio/gstbaseaudiosink.c:

297
ext/vorbis/vorbisdec.c
View file

@ -87,6 +87,8 @@ GST_BOILERPLATE (GstVorbisDec, gst_vorbis_dec, GstElement, GST_TYPE_ELEMENT);
static void vorbis_dec_finalize (GObject * object);
static gboolean vorbis_dec_sink_event (GstPad * pad, GstEvent * event);
static GstFlowReturn vorbis_dec_chain (GstPad * pad, GstBuffer * buffer);
static GstFlowReturn vorbis_dec_chain_forward (GstVorbisDec * vd,
gboolean discont, GstBuffer * buffer);
static GstStateChangeReturn vorbis_dec_change_state (GstElement * element,
GstStateChange transition);
@ -523,13 +525,10 @@ vorbis_dec_sink_event (GstPad * pad, GstEvent * event)
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
/* we need time and a positive rate for now */
/* we need time for now */
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
if (rate <= 0.0)
goto newseg_wrong_rate;
GST_DEBUG_OBJECT (dec,
"newsegment: update %d, rate %g, arate %g, start %" GST_TIME_FORMAT
", stop %" GST_TIME_FORMAT ", time %" GST_TIME_FORMAT,
@ -565,11 +564,6 @@ newseg_wrong_format:
GST_DEBUG_OBJECT (dec, "received non TIME newsegment");
goto done;
}
newseg_wrong_rate:
{
GST_DEBUG_OBJECT (dec, "negative rates not supported yet");
goto done;
}
}
static GstFlowReturn
@ -862,7 +856,7 @@ clipped:
}
static GstFlowReturn
vorbis_dec_push (GstVorbisDec * dec, GstBuffer * buf)
vorbis_dec_push_forward (GstVorbisDec * dec, GstBuffer * buf)
{
GstFlowReturn result;
gint64 outoffset = GST_BUFFER_OFFSET (buf);
@ -926,6 +920,16 @@ vorbis_dec_push (GstVorbisDec * dec, GstBuffer * buf)
return result;
}
static GstFlowReturn
vorbis_dec_push_reverse (GstVorbisDec * dec, GstBuffer * buf)
{
GstFlowReturn result = GST_FLOW_OK;
dec->queued = g_list_prepend (dec->queued, buf);
return result;
}
static GstFlowReturn
vorbis_handle_data_packet (GstVorbisDec * vd, ogg_packet * packet)
{
@ -983,18 +987,12 @@ vorbis_handle_data_packet (GstVorbisDec * vd, ogg_packet * packet)
vd->vi.channels);
GST_BUFFER_SIZE (out) = size;
GST_BUFFER_OFFSET (out) = vd->granulepos;
if (vd->granulepos != -1) {
GST_BUFFER_OFFSET_END (out) = vd->granulepos + sample_count;
GST_BUFFER_TIMESTAMP (out) =
gst_util_uint64_scale_int (vd->granulepos, GST_SECOND, vd->vi.rate);
} else {
GST_BUFFER_TIMESTAMP (out) = -1;
}
/* this should not overflow */
GST_BUFFER_DURATION (out) = sample_count * GST_SECOND / vd->vi.rate;
if (vd->cur_timestamp != GST_CLOCK_TIME_NONE) {
/* we have incomming timestamps */
GST_BUFFER_TIMESTAMP (out) = vd->cur_timestamp;
GST_DEBUG_OBJECT (vd,
"cur_timestamp: %" GST_TIME_FORMAT " + %" GST_TIME_FORMAT " = %"
@ -1005,12 +1003,25 @@ vorbis_handle_data_packet (GstVorbisDec * vd, ogg_packet * packet)
GST_BUFFER_OFFSET (out) = GST_CLOCK_TIME_TO_FRAMES (vd->cur_timestamp,
vd->vi.rate);
GST_BUFFER_OFFSET_END (out) = GST_BUFFER_OFFSET (out) + sample_count;
} else {
/* we have incomming granulepos */
GST_BUFFER_OFFSET (out) = vd->granulepos;
if (vd->granulepos != -1) {
GST_BUFFER_OFFSET_END (out) = vd->granulepos + sample_count;
GST_BUFFER_TIMESTAMP (out) =
gst_util_uint64_scale_int (vd->granulepos, GST_SECOND, vd->vi.rate);
} else {
GST_BUFFER_TIMESTAMP (out) = -1;
}
}
if (vd->granulepos != -1)
vd->granulepos += sample_count;
result = vorbis_dec_push (vd, out);
if (vd->segment.rate >= 0.0)
result = vorbis_dec_push_forward (vd, out);
else
result = vorbis_dec_push_reverse (vd, out);
done:
vorbis_synthesis_read (&vd->vd, sample_count);
@ -1050,28 +1061,13 @@ wrong_samples:
}
static GstFlowReturn
vorbis_dec_chain (GstPad * pad, GstBuffer * buffer)
vorbis_dec_decode_buffer (GstVorbisDec * vd, GstBuffer * buffer, gboolean eos)
{
GstVorbisDec *vd;
ogg_packet packet;
GstFlowReturn result = GST_FLOW_OK;
GstClockTime timestamp;
guint64 offset_end;
vd = GST_VORBIS_DEC (gst_pad_get_parent (pad));
/* resync on DISCONT */
if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
GST_DEBUG_OBJECT (vd, "received DISCONT buffer");
vd->granulepos = -1;
vd->cur_timestamp = GST_CLOCK_TIME_NONE;
vd->prev_timestamp = GST_CLOCK_TIME_NONE;
#ifdef HAVE_VORBIS_SYNTHESIS_RESTART
vorbis_synthesis_restart (&vd->vd);
#endif
vd->discont = TRUE;
}
timestamp = GST_BUFFER_TIMESTAMP (buffer);
offset_end = GST_BUFFER_OFFSET_END (buffer);
@ -1099,7 +1095,7 @@ vorbis_dec_chain (GstPad * pad, GstBuffer * buffer)
* Yes there is, keep one packet at all times and only push out when
* you receive a new one. Implement this.
*/
packet.e_o_s = 0;
packet.e_o_s = (eos ? 1 : 0);
if (G_UNLIKELY (packet.bytes < 1))
goto wrong_size;
@ -1121,9 +1117,6 @@ vorbis_dec_chain (GstPad * pad, GstBuffer * buffer)
GST_DEBUG_OBJECT (vd, "offset end: %" G_GUINT64_FORMAT, offset_end);
done:
gst_buffer_unref (buffer);
gst_object_unref (vd);
return result;
/* ERRORS */
@ -1136,6 +1129,232 @@ wrong_size:
}
}
/*
* Input:
* Buffer decoding order: 7 8 9 4 5 6 3 1 2 EOS
* Discont flag: D D D D
*
* - Each Discont marks a discont in the decoding order.
*
* for vorbis, each buffer is a keyframe when we have the previous
* buffer. This means that to decode buffer 7, we need buffer 6, which
* arrives out of order.
*
* we first gather buffers in the gather queue until we get a DISCONT. We
* prepend each incomming buffer so that they are in reversed order.
*
* gather queue: 9 8 7
* decode queue:
* output queue:
*
* When a DISCONT is received (buffer 4), we move the gather queue to the
* decode queue. This simply done be taking the head of the gather queue
* and prepending it to the decode queue. This yields:
*
* gather queue:
* decode queue: 7 8 9
* output queue:
*
* Then we decode each buffer in the decode queue in order and put the output
* buffer in the output queue. The first buffer (7) will not produce and output
* because it needs the previous buffer (6) which did not arrive yet. This
* yields:
*
* gather queue:
* decode queue: 7 8 9
* output queue: 8 9
*
* Then we remove the consumed buffers from the decode queue. Buffer 7 is not
* completely consumed, we need to keep it around for when we receive buffer
* 6. This yields:
*
* gather queue:
* decode queue: 7
* output queue: 9 8
*
* Then we accumulate more buffers:
*
* gather queue: 6 5 4
* decode queue: 7
* output queue:
*
* prepending to the decode queue on DISCONT yields:
*
* gather queue:
* decode queue: 4 5 6 7
* output queue:
*
* after decoding and keeping buffer 4:
*
* gather queue:
* decode queue: 4
* output queue: 7 6 5
*
* Etc..
*/
static GstFlowReturn
vorbis_dec_flush_decode (GstVorbisDec * dec)
{
GstFlowReturn res = GST_FLOW_OK;
GList *walk;
walk = dec->decode;
GST_DEBUG_OBJECT (dec, "flushing buffers to decoder");
while (walk) {
GList *next;
GstBuffer *buf = GST_BUFFER_CAST (walk->data);
GST_DEBUG_OBJECT (dec, "decoding buffer %p, ts %" GST_TIME_FORMAT,
buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
next = g_list_next (walk);
/* decode buffer, prepend to output queue */
res = vorbis_dec_decode_buffer (dec, buf, next == NULL);
/* if we generated output, we can discard the buffer, else we
* keep it in the queue */
if (dec->queued) {
GST_DEBUG_OBJECT (dec, "decoded buffer to %p", dec->queued->data);
dec->decode = g_list_delete_link (dec->decode, walk);
gst_buffer_unref (buf);
} else {
GST_DEBUG_OBJECT (dec, "buffer did not decode, keeping");
}
walk = next;
}
if (dec->granulepos != -1) {
GstClockTime endts;
endts =
gst_util_uint64_scale_int (dec->granulepos, GST_SECOND, dec->vi.rate);
GST_DEBUG_OBJECT (dec, "we have granulepos %" G_GUINT64_FORMAT ", ts %"
GST_TIME_FORMAT, dec->granulepos, GST_TIME_ARGS (endts));
while (dec->queued) {
GstBuffer *buf;
guint sample_count;
buf = GST_BUFFER_CAST (dec->queued->data);
sample_count =
GST_BUFFER_SIZE (buf) / (dec->vi.channels * sizeof (float));
GST_BUFFER_OFFSET_END (buf) = dec->granulepos;
endts =
gst_util_uint64_scale_int (dec->granulepos, GST_SECOND, dec->vi.rate);
dec->granulepos -= sample_count;
GST_BUFFER_OFFSET (buf) = dec->granulepos;
GST_BUFFER_TIMESTAMP (buf) =
gst_util_uint64_scale_int (dec->granulepos, GST_SECOND, dec->vi.rate);
GST_BUFFER_DURATION (buf) = endts - GST_BUFFER_TIMESTAMP (buf);
/* clip, this will unref the buffer in case of clipping */
if (vorbis_do_clip (dec, buf)) {
GST_DEBUG_OBJECT (dec, "clipped buffer %p", buf);
gst_buffer_unref (buf);
goto next;
}
if (dec->discont) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
dec->discont = FALSE;
}
GST_DEBUG_OBJECT (dec, "pushing buffer %p, samples %u, "
"ts %" GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT,
buf, sample_count, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)));
res = gst_pad_push (dec->srcpad, buf);
next:
dec->queued = g_list_delete_link (dec->queued, dec->queued);
}
} else {
GST_DEBUG_OBJECT (dec, "we don't have a granulepos yet, delayed push");
}
return res;
}
static GstFlowReturn
vorbis_dec_chain_reverse (GstVorbisDec * vd, gboolean discont, GstBuffer * buf)
{
GstFlowReturn result = GST_FLOW_OK;
/* if we have a discont, move buffers to the decode list */
if (G_UNLIKELY (discont)) {
GST_DEBUG_OBJECT (vd, "received discont");
while (vd->gather) {
GstBuffer *gbuf;
gbuf = GST_BUFFER_CAST (vd->gather->data);
/* remove from the gather list */
vd->gather = g_list_delete_link (vd->gather, vd->gather);
/* copy to decode queue */
vd->decode = g_list_prepend (vd->decode, gbuf);
}
/* flush and decode the decode queue */
result = vorbis_dec_flush_decode (vd);
}
GST_DEBUG_OBJECT (vd, "gathering buffer %p, size %u", buf,
GST_BUFFER_SIZE (buf));
/* add buffer to gather queue */
vd->gather = g_list_prepend (vd->gather, buf);
return result;
}
static GstFlowReturn
vorbis_dec_chain_forward (GstVorbisDec * vd, gboolean discont,
GstBuffer * buffer)
{
GstFlowReturn result;
result = vorbis_dec_decode_buffer (vd, buffer, FALSE);
gst_buffer_unref (buffer);
return result;
}
static GstFlowReturn
vorbis_dec_chain (GstPad * pad, GstBuffer * buffer)
{
GstVorbisDec *vd;
GstFlowReturn result = GST_FLOW_OK;
gboolean discont;
vd = GST_VORBIS_DEC (gst_pad_get_parent (pad));
discont = GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT);
/* resync on DISCONT */
if (G_UNLIKELY (discont)) {
GST_DEBUG_OBJECT (vd, "received DISCONT buffer");
vd->granulepos = -1;
vd->cur_timestamp = GST_CLOCK_TIME_NONE;
vd->prev_timestamp = GST_CLOCK_TIME_NONE;
#ifdef HAVE_VORBIS_SYNTHESIS_RESTART
vorbis_synthesis_restart (&vd->vd);
#endif
vd->discont = TRUE;
}
if (vd->segment.rate >= 0.0)
result = vorbis_dec_chain_forward (vd, discont, buffer);
else
result = vorbis_dec_chain_reverse (vd, discont, buffer);
gst_object_unref (vd);
return result;
}
static GstStateChangeReturn
vorbis_dec_change_state (GstElement * element, GstStateChange transition)
{

6
ext/vorbis/vorbisdec.h
View file

@ -61,7 +61,13 @@ struct _GstVorbisDec {
gboolean initialized;
/* list of buffers that need timestamps */
GList *queued;
/* list of raw output buffers */
GList *output;
/* gather/decode queues for reverse playback */
GList *gather;
GList *decode;
GstSegment segment;
gboolean discont;