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videodecoder: Add API to conveniently handle tags

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This commit is contained in:
Sebastian Dröge 2012-08-09 16:02:42 +02:00
parent 3c915afc39
commit 9ffb579b75
2 changed files with 52 additions and 0 deletions
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48
gst-libs/gst/video/gstvideodecoder.c
View file

@ -394,6 +394,9 @@ struct _GstVideoDecoderPrivate
gint64 min_latency;
gint64 max_latency;
GstTagList *tags;
gboolean tags_changed;
};
static GstElementClass *parent_class = NULL;
@ -1548,6 +1551,11 @@ gst_video_decoder_reset (GstVideoDecoder * decoder, gboolean full)
priv->output_state = NULL;
priv->min_latency = 0;
priv->max_latency = 0;
if (priv->tags)
gst_tag_list_unref (priv->tags);
priv->tags = NULL;
priv->tags_changed = FALSE;
}
priv->discont = TRUE;
@ -2207,6 +2215,12 @@ gst_video_decoder_finish_frame (GstVideoDecoder * decoder,
gst_video_decoder_prepare_finish_frame (decoder, frame, FALSE);
priv->processed++;
if (priv->tags && priv->tags_changed) {
gst_video_decoder_push_event (decoder,
gst_event_new_tag (gst_tag_list_ref (priv->tags)));
priv->tags_changed = FALSE;
}
/* no buffer data means this frame is skipped */
if (!frame->output_buffer || GST_VIDEO_CODEC_FRAME_IS_DECODE_ONLY (frame)) {
GST_DEBUG_OBJECT (decoder, "skipping frame %" GST_TIME_FORMAT,
@ -3078,3 +3092,37 @@ gst_video_decoder_get_latency (GstVideoDecoder * decoder,
*max_latency = decoder->priv->max_latency;
GST_OBJECT_UNLOCK (decoder);
}
/**
* gst_video_decoder_merge_tags:
* @decoder: a #GstVideoDecoder
* @tags: a #GstTagList to merge
* @mode: the #GstTagMergeMode to use
*
* Adds tags to so-called pending tags, which will be processed
* before pushing out data downstream.
*
* Note that this is provided for convenience, and the subclass is
* not required to use this and can still do tag handling on its own.
*
* MT safe.
*/
void
gst_video_decoder_merge_tags (GstVideoDecoder * decoder,
const GstTagList * tags, GstTagMergeMode mode)
{
GstTagList *otags;
g_return_if_fail (GST_IS_VIDEO_DECODER (decoder));
g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (tags)
GST_DEBUG_OBJECT (decoder, "merging tags %" GST_PTR_FORMAT, tags);
otags = decoder->priv->tags;
decoder->priv->tags = gst_tag_list_merge (decoder->priv->tags, tags, mode);
if (otags)
gst_tag_list_unref (otags);
decoder->priv->tags_changed = TRUE;
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
}

4
gst-libs/gst/video/gstvideodecoder.h
View file

@ -344,6 +344,10 @@ GstFlowReturn gst_video_decoder_finish_frame (GstVideoDecoder *decoder,
GstFlowReturn gst_video_decoder_drop_frame (GstVideoDecoder *dec,
GstVideoCodecFrame *frame);
void gst_video_decoder_merge_tags (GstVideoDecoder *dec,
const GstTagList *tags,
GstTagMergeMode mode);
G_END_DECLS
#endif