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qtdemux: Add push mode seek support for seeking to obtain the moov atom

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Robert Swain 2009-11-24 16:27:26 +01:00 committed by Wim Taymans
parent 8c5a822250
commit 4b2b7067b6
2 changed files with 75 additions and 13 deletions
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87
gst/qtdemux/qtdemux.c
View file

@ -467,6 +467,7 @@ gst_qtdemux_init (GstQTDemux * qtdemux)
qtdemux->todrop = 0;
qtdemux->adapter = gst_adapter_new ();
qtdemux->offset = 0;
qtdemux->first_mdat = -1;
qtdemux->mdatoffset = GST_CLOCK_TIME_NONE;
qtdemux->mdatbuffer = NULL;
gst_segment_init (&qtdemux->segment, GST_FORMAT_TIME);
@ -1541,6 +1542,7 @@ gst_qtdemux_change_state (GstElement * element, GstStateChange transition)
qtdemux->todrop = 0;
qtdemux->pullbased = FALSE;
qtdemux->offset = 0;
qtdemux->first_mdat = -1;
qtdemux->mdatoffset = GST_CLOCK_TIME_NONE;
if (qtdemux->mdatbuffer)
gst_buffer_unref (qtdemux->mdatbuffer);
@ -2865,6 +2867,24 @@ gst_qtdemux_post_progress (GstQTDemux * demux, gint num, gint denom)
gst_structure_new ("progress", "percent", G_TYPE_INT, perc, NULL)));
}
static gboolean
qtdemux_do_push_seek (GstQTDemux * demux, guint64 offset)
{
GstEvent *event;
gboolean res = 0;
GST_DEBUG_OBJECT (demux, "Seeking to %" G_GUINT64_FORMAT, offset);
event =
gst_event_new_seek (1.0, GST_FORMAT_BYTES,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET, offset,
GST_SEEK_TYPE_NONE, -1);
res = gst_pad_push_event (demux->sinkpad, event);
return res;
}
/* FIXME, unverified after edit list updates */
static GstFlowReturn
gst_qtdemux_chain (GstPad * sinkpad, GstBuffer * inbuf)
@ -2919,24 +2939,52 @@ gst_qtdemux_chain (GstPad * sinkpad, GstBuffer * inbuf)
}
if (fourcc == FOURCC_mdat) {
if (demux->n_streams > 0) {
/* we have the headers, start playback */
demux->state = QTDEMUX_STATE_MOVIE;
demux->neededbytes = next_entry_size (demux);
} else {
/* no headers yet, try to get them */
guint bs;
gboolean res;
guint64 old, target;
buffer_data:
/* there may be multiple mdat (or alike) buffers */
/* sanity check */
if (demux->mdatbuffer)
bs = GST_BUFFER_SIZE (demux->mdatbuffer);
else
bs = 0;
if (size + bs > 10 * (1 << 20))
goto no_moov;
demux->state = QTDEMUX_STATE_BUFFER_MDAT;
demux->neededbytes = size;
if (!demux->mdatbuffer)
demux->mdatoffset = demux->offset;
old = demux->offset;
target = old + size;
/* try to jump over the atom with a seek */
res = qtdemux_do_push_seek (demux, target);
if (res) {
GST_DEBUG_OBJECT (demux, "seek success");
/* remember the offset fo the first mdat so we can seek back to it
* after we have the headers */
if (fourcc == FOURCC_mdat && demux->first_mdat == -1) {
demux->first_mdat = old;
GST_DEBUG_OBJECT (demux, "first mdat at %" G_GUINT64_FORMAT,
demux->first_mdat);
}
/* seek worked, continue reading */
demux->offset = target;
demux->neededbytes = 16;
demux->state = QTDEMUX_STATE_INITIAL;
} else {
/* seek failed, need to buffer */
demux->offset = old;
GST_DEBUG_OBJECT (demux, "seek failed");
/* there may be multiple mdat (or alike) buffers */
/* sanity check */
if (demux->mdatbuffer)
bs = GST_BUFFER_SIZE (demux->mdatbuffer);
else
bs = 0;
if (size + bs > 10 * (1 << 20))
goto no_moov;
demux->state = QTDEMUX_STATE_BUFFER_MDAT;
demux->neededbytes = size;
if (!demux->mdatbuffer)
demux->mdatoffset = demux->offset;
}
}
} else if (G_UNLIKELY (size > QTDEMUX_MAX_ATOM_SIZE)) {
GST_ELEMENT_ERROR (demux, STREAM, DECODE,
@ -3006,7 +3054,20 @@ gst_qtdemux_chain (GstPad * sinkpad, GstBuffer * inbuf)
} else {
GST_DEBUG_OBJECT (demux, "Carrying on normally");
gst_adapter_flush (demux->adapter, demux->neededbytes);
demux->offset += demux->neededbytes;
if (demux->first_mdat != -1) {
gboolean res;
/* we need to seek back */
res = qtdemux_do_push_seek (demux, demux->first_mdat);
if (res) {
demux->offset = demux->first_mdat;
} else {
GST_DEBUG_OBJECT (demux, "Seek back failed");
}
} else {
demux->offset += demux->neededbytes;
}
demux->neededbytes = 16;
demux->state = QTDEMUX_STATE_INITIAL;
}

1
gst/qtdemux/qtdemux.h
View file

@ -86,6 +86,7 @@ struct _GstQTDemux {
guint64 offset;
/* offset of the mdat atom */
guint64 mdatoffset;
guint64 first_mdat;
GstTagList *tag_list;