/* decode a clip tag
* this callback is registered with dec->parser. It is called whenever a
* clip is parsed.
*/
static void
gst_cmml_dec_parse_clip (GstCmmlDec * dec, GstCmmlTagClip * clip)
{
GstCmmlTagClip *prev_clip;
dec->flow_return = GST_FLOW_OK;
if (clip->empty)
GST_INFO_OBJECT (dec, "parsing empty clip");
else
GST_INFO_OBJECT (dec, "parsing clip (id: %s)", clip->id);
clip->start_time = dec->timestamp;
if (clip->start_time == GST_CLOCK_TIME_NONE) {
GST_ELEMENT_ERROR (dec, STREAM, DECODE,
(NULL), ("invalid clip start time"));
dec->flow_return = GST_FLOW_ERROR;
return;
}
/* get the last clip in the current track */
prev_clip = gst_cmml_track_list_get_track_last_clip (dec->tracks,
(gchar *) clip->track);
if (prev_clip) {
/* output the previous clip */
if (clip->empty)
/* the current clip marks the end of the previous one */
prev_clip->end_time = clip->start_time;
gst_cmml_dec_push_clip (dec, prev_clip);
}
if (dec->wait_clip_end) {
/* now it's time to send the tag for the previous clip */
if (prev_clip) {
prev_clip->end_time = clip->start_time;
gst_cmml_dec_send_clip_tag (dec, prev_clip);
}
} else if (!clip->empty) {
/* send the tag for the current clip */
gst_cmml_dec_send_clip_tag (dec, clip);
}
if (prev_clip)
gst_cmml_track_list_del_clip (dec->tracks, prev_clip);
if (!clip->empty)
if (!gst_cmml_track_list_has_clip (dec->tracks, clip))
gst_cmml_track_list_add_clip (dec->tracks, clip);
}
/* encode a CMML clip tag
* remove the start and end attributes (GstCmmlParser does this itself) and
* push the tag with the timestamp of its start attribute. If the tag has the
* end attribute, create a new empty clip and encode it.
*/
static void
gst_cmml_enc_parse_tag_clip (GstCmmlEnc * enc, GstCmmlTagClip * clip)
{
GstCmmlTagClip *prev_clip;
GstClockTime prev_clip_time = GST_CLOCK_TIME_NONE;
/* this can happen if there's a programming error (eg user forgets to set
* the start-time property) or if one of the gst_cmml_clock_time_from_*
* overflows in GstCmmlParser */
if (clip->start_time == GST_CLOCK_TIME_NONE) {
GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
(NULL), ("invalid start time for clip (%s)", clip->id));
enc->flow_return = GST_FLOW_ERROR;
return;
}
/* get the previous clip's start time to encode the current granulepos */
prev_clip = gst_cmml_track_list_get_track_last_clip (enc->tracks,
(gchar *) clip->track);
if (prev_clip) {
prev_clip_time = prev_clip->start_time;
if (prev_clip_time > clip->start_time) {
GST_ELEMENT_ERROR (enc, STREAM, ENCODE,
(NULL), ("previous clip start time > current clip (%s) start time",
clip->id));
enc->flow_return = GST_FLOW_ERROR;
return;
}
/* we don't need the prev clip anymore */
gst_cmml_track_list_del_clip (enc->tracks, prev_clip);
}
/* add the current clip to the tracklist */
gst_cmml_track_list_add_clip (enc->tracks, clip);
enc->flow_return = gst_cmml_enc_push_clip (enc, clip, prev_clip_time);
}
