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gst/rawparse/gstrawparse.c: Add simple reverse playback.

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Original commit message from CVS:
* gst/rawparse/gstrawparse.c: (gst_raw_parse_push_buffer),
(gst_raw_parse_loop), (gst_raw_parse_handle_seek_push),
(gst_raw_parse_handle_seek_pull):
Add simple reverse playback.
This commit is contained in:
Wim Taymans 2008-06-09 17:57:08 +00:00
parent 409526e5e7
commit 5e88627e2b
2 changed files with 48 additions and 21 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2008-06-09 Wim Taymans <wim.taymans@collabora.co.uk>
* gst/rawparse/gstrawparse.c: (gst_raw_parse_push_buffer),
(gst_raw_parse_loop), (gst_raw_parse_handle_seek_push),
(gst_raw_parse_handle_seek_pull):
Add simple reverse playback.
2008-06-09 Wim Taymans <wim.taymans@collabora.co.uk>
* gst/rawparse/gstrawparse.c: (gst_raw_parse_reset),

62
gst/rawparse/gstrawparse.c
View file

@ -216,6 +216,11 @@ gst_raw_parse_push_buffer (GstRawParse * rp, GstBuffer * buffer)
nframes = GST_BUFFER_SIZE (buffer) / rp->framesize;
if (rp->segment.rate < 0) {
rp->n_frames -= nframes;
rp->discont = TRUE;
}
GST_BUFFER_OFFSET (buffer) = rp->n_frames;
GST_BUFFER_OFFSET_END (buffer) = rp->n_frames + nframes;
@ -236,8 +241,10 @@ gst_raw_parse_push_buffer (GstRawParse * rp, GstBuffer * buffer)
rp->discont = FALSE;
}
rp->offset += GST_BUFFER_SIZE (buffer);
rp->n_frames += nframes;
if (rp->segment.rate >= 0) {
rp->offset += GST_BUFFER_SIZE (buffer);
rp->n_frames += nframes;
}
rp->segment.last_stop = GST_BUFFER_TIMESTAMP (buffer);
@ -324,20 +331,31 @@ gst_raw_parse_loop (GstElement * element)
else
size = rp->framesize;
if (rp->offset + size > rp->upstream_length) {
GstFormat fmt = GST_FORMAT_BYTES;
if (rp->segment.rate >= 0) {
if (rp->offset + size > rp->upstream_length) {
GstFormat fmt = GST_FORMAT_BYTES;
if (!gst_pad_query_peer_duration (rp->sinkpad, &fmt, &rp->upstream_length)) {
GST_WARNING_OBJECT (rp,
"Could not get upstream duration, trying to pull frame by frame");
size = rp->framesize;
} else if (rp->upstream_length < rp->offset + rp->framesize) {
if (!gst_pad_query_peer_duration (rp->sinkpad, &fmt,
&rp->upstream_length)) {
GST_WARNING_OBJECT (rp,
"Could not get upstream duration, trying to pull frame by frame");
size = rp->framesize;
} else if (rp->upstream_length < rp->offset + rp->framesize) {
ret = GST_FLOW_UNEXPECTED;
goto pause;
} else if (rp->offset + size > rp->upstream_length) {
size = rp->upstream_length - rp->offset;
size -= size % rp->framesize;
}
}
} else {
if (rp->offset == 0) {
ret = GST_FLOW_UNEXPECTED;
goto pause;
} else if (rp->offset + size > rp->upstream_length) {
size = rp->upstream_length - rp->offset;
size -= size % rp->framesize;
} else if (rp->offset < size) {
size -= rp->offset;
}
rp->offset -= size;
}
ret = gst_pad_pull_range (rp->sinkpad, rp->offset, size, &buffer);
@ -666,6 +684,10 @@ gst_raw_parse_handle_seek_push (GstRawParse * rp, GstEvent * event)
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
/* can't seek backwards yet */
if (rate <= 0.0)
goto wrong_rate;
/* First try if upstream handles the seek */
ret = gst_pad_push_event (rp->sinkpad, event);
if (ret)
@ -695,6 +717,13 @@ gst_raw_parse_handle_seek_push (GstRawParse * rp, GstEvent * event)
"seeking is only supported in TIME or DEFAULT format");
}
return ret;
/* ERRORS */
wrong_rate:
{
GST_DEBUG_OBJECT (rp, "Seek failed: negative rates not supported yet");
return FALSE;
}
}
static gboolean
@ -714,10 +743,6 @@ gst_raw_parse_handle_seek_pull (GstRawParse * rp, GstEvent * event)
gst_event_parse_seek (event, &rate, &format, &flags, &start_type, &start,
&stop_type, &stop);
/* can't seek backwards yet */
if (rate <= 0.0)
goto wrong_rate;
/* convert input offsets to time */
ret = gst_raw_parse_convert (rp, format, start, GST_FORMAT_TIME, &start);
ret &= gst_raw_parse_convert (rp, format, stop, GST_FORMAT_TIME, &stop);
@ -845,11 +870,6 @@ gst_raw_parse_handle_seek_pull (GstRawParse * rp, GstEvent * event)
return ret;
/* ERRORS */
wrong_rate:
{
GST_DEBUG_OBJECT (rp, "Seek failed: negative rates not supported yet");
return FALSE;
}
convert_failed:
{
GST_DEBUG_OBJECT (rp, "Seek failed: couldn't convert to byte positions");