static GstFlowReturn
gst_mpegv_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstTagList *taglist;
/* tag sending done late enough in hook to ensure pending events
* have already been sent */
if (G_UNLIKELY (mpvparse->send_codec_tag)) {
gchar *codec;
/* codec tag */
codec =
g_strdup_printf ("MPEG %d Video",
(mpvparse->config_flags & FLAG_MPEG2) ? 2 : 1);
taglist = gst_tag_list_new (GST_TAG_VIDEO_CODEC, codec, NULL);
g_free (codec);
gst_pad_push_event (GST_BASE_PARSE_SRC_PAD (mpvparse),
gst_event_new_tag (taglist));
mpvparse->send_codec_tag = FALSE;
}
/* usual clipping applies */
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
return GST_FLOW_OK;
}
static gboolean
gst_mpegv_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstStructure *s;
const GValue *value;
GstBuffer *buf;
GST_DEBUG_OBJECT (parse, "setcaps called with %" GST_PTR_FORMAT, caps);
s = gst_caps_get_structure (caps, 0);
if ((value = gst_structure_get_value (s, "codec_data")) != NULL
&& (buf = gst_value_get_buffer (value))) {
GstMapInfo map;
gst_buffer_map (buf, &map, GST_MAP_READ);
/* best possible parse attempt,
* src caps are based on sink caps so it will end up in there
* whether sucessful or not */
mpvparse->seq_offset = 4;
gst_mpegv_parse_process_config (mpvparse, &map, gst_buffer_get_size (buf));
gst_buffer_unmap (buf, &map);
gst_mpegv_parse_reset_frame (mpvparse);
}
/* let's not interfere and accept regardless of config parsing success */
return TRUE;
}
static GstFlowReturn
gst_mpegv_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstBuffer *buffer = frame->buffer;
gst_mpegv_parse_update_src_caps (mpvparse);
if (G_UNLIKELY (mpvparse->pichdr.pic_type == GST_MPEG_VIDEO_PICTURE_TYPE_I))
GST_BUFFER_FLAG_UNSET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
else
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
/* maybe only sequence in this buffer, though not recommended,
* so mark it as such and force 0 duration */
if (G_UNLIKELY (mpvparse->pic_offset < 0)) {
GST_DEBUG_OBJECT (mpvparse, "frame holds no picture data");
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NO_FRAME;
GST_BUFFER_DURATION (buffer) = 0;
}
if (mpvparse->frame_repeat_count
&& GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer))) {
GST_BUFFER_DURATION (buffer) =
(1 + mpvparse->frame_repeat_count) * GST_BUFFER_DURATION (buffer) / 2;
}
if (G_UNLIKELY (mpvparse->drop && !mpvparse->config)) {
GST_DEBUG_OBJECT (mpvparse, "dropping frame as no config yet");
return GST_BASE_PARSE_FLOW_DROPPED;
} else
return GST_FLOW_OK;
}
static gboolean
gst_mpegv_parse_stop (GstBaseParse * parse)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GST_DEBUG_OBJECT (parse, "stop");
gst_mpegv_parse_reset (mpvparse);
return TRUE;
}
static gboolean
gst_mpegv_parse_start (GstBaseParse * parse)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GST_DEBUG_OBJECT (parse, "start");
gst_mpegv_parse_reset (mpvparse);
/* at least this much for a valid frame */
gst_base_parse_set_min_frame_size (parse, 6);
return TRUE;
}
static void
gst_mpegv_parse_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstMpegvParse *parse = GST_MPEGVIDEO_PARSE (object);
switch (property_id) {
case PROP_DROP:
parse->drop = g_value_get_boolean (value);
break;
case PROP_GOP_SPLIT:
parse->gop_split = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static gboolean
gst_mpegv_parse_sink_query (GstBaseParse * parse, GstQuery * query)
{
gboolean res;
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
res = GST_BASE_PARSE_CLASS (parent_class)->sink_query (parse, query);
if (res && GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION) {
mpvparse->send_mpeg_meta =
gst_query_find_allocation_meta (query, GST_MPEG_VIDEO_META_API_TYPE,
NULL);
GST_DEBUG_OBJECT (parse, "Downstream can handle GstMpegVideo GstMeta : %d",
mpvparse->send_mpeg_meta);
}
return res;
}
static GstFlowReturn
gst_mpegv_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstBuffer *buf = frame->buffer;
gboolean ret = FALSE;
gint off = 0;
GstMpegVideoPacket packet;
guint8 *data;
gint size;
GstMapInfo map;
update_frame_parsing_status (mpvparse, frame);
gst_buffer_map (buf, &map, GST_MAP_READ);
data = map.data;
size = map.size;
retry:
/* at least start code and subsequent byte */
if (G_UNLIKELY (size < 5 + off))
goto exit;
/* if already found a previous start code, e.g. start of frame, go for next */
if (mpvparse->last_sc >= 0) {
off = packet.offset = mpvparse->last_sc;
packet.size = 0;
goto next;
}
if (!gst_mpeg_video_parse (&packet, data, size, off)) {
/* didn't find anything that looks like a sync word, skip */
GST_LOG_OBJECT (mpvparse, "no start code found");
*skipsize = size - 3;
goto exit;
}
off = packet.offset - 4;
GST_LOG_OBJECT (mpvparse, "possible sync at buffer offset %d", off);
/* possible frame header, but not at offset 0? skip bytes before sync */
if (G_UNLIKELY (off > 0)) {
*skipsize = off;
goto exit;
}
/* note: initial start code is assumed at offset 0 by subsequent code */
/* examine start code, see if it looks like an initial start code */
if (gst_mpegv_parse_process_sc (mpvparse, buf, 4, packet.type)) {
/* found sc */
GST_LOG_OBJECT (mpvparse, "valid start code found");
mpvparse->last_sc = 0;
} else {
off++;
gst_mpegv_parse_reset_frame (mpvparse);
GST_LOG_OBJECT (mpvparse, "invalid start code");
goto retry;
}
next:
/* start is fine as of now */
*skipsize = 0;
/* terminating start code may have been found in prev scan already */
if (((gint) packet.size) >= 0) {
off = packet.offset + packet.size;
/* so now we have start code at start of data; locate next start code */
if (!gst_mpeg_video_parse (&packet, data, size, off)) {
off = -1;
} else {
g_assert (packet.offset >= 4);
off = packet.offset - 4;
}
} else {
off = -1;
}
GST_LOG_OBJECT (mpvparse, "next start code at %d", off);
if (off < 0) {
/* if draining, take all */
if (GST_BASE_PARSE_DRAINING (parse)) {
GST_LOG_OBJECT (mpvparse, "draining, accepting all data");
off = size;
ret = TRUE;
} else {
GST_LOG_OBJECT (mpvparse, "need more data");
/* resume scan where we left it */
mpvparse->last_sc = size - 3;
/* request best next available */
off = G_MAXUINT;
goto exit;
}
} else {
/* decide whether this startcode ends a frame */
ret = gst_mpegv_parse_process_sc (mpvparse, buf, off + 4, packet.type);
}
if (!ret)
goto next;
exit:
gst_buffer_unmap (buf, &map);
if (ret) {
GstFlowReturn res;
*skipsize = 0;
g_assert (off <= map.size);
res = gst_mpegv_parse_parse_frame (parse, frame);
if (res == GST_BASE_PARSE_FLOW_DROPPED)
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_DROP;
return gst_base_parse_finish_frame (parse, frame, off);
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mpegv_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstMpegvParse *mpvparse = GST_MPEGVIDEO_PARSE (parse);
GstTagList *taglist;
GstMpegVideoMeta *meta;
GstMpegVideoSequenceHdr *seq_hdr = NULL;
GstMpegVideoSequenceExt *seq_ext = NULL;
GstMpegVideoSequenceDisplayExt *disp_ext = NULL;
GstMpegVideoPictureHdr *pic_hdr = NULL;
GstMpegVideoPictureExt *pic_ext = NULL;
GstMpegVideoQuantMatrixExt *quant_ext = NULL;
/* tag sending done late enough in hook to ensure pending events
* have already been sent */
if (G_UNLIKELY (mpvparse->send_codec_tag)) {
gchar *codec;
/* codec tag */
codec =
g_strdup_printf ("MPEG %d Video",
(mpvparse->config_flags & FLAG_MPEG2) ? 2 : 1);
taglist = gst_tag_list_new (GST_TAG_VIDEO_CODEC, codec, NULL);
g_free (codec);
gst_pad_push_event (GST_BASE_PARSE_SRC_PAD (mpvparse),
gst_event_new_tag (taglist));
mpvparse->send_codec_tag = FALSE;
}
/* usual clipping applies */
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
if (mpvparse->send_mpeg_meta) {
GstBuffer *buf;
if (mpvparse->seqhdr_updated)
seq_hdr = &mpvparse->sequencehdr;
if (mpvparse->seqext_updated)
seq_ext = &mpvparse->sequenceext;
if (mpvparse->seqdispext_updated)
disp_ext = &mpvparse->sequencedispext;
if (mpvparse->picext_updated)
pic_ext = &mpvparse->picext;
if (mpvparse->quantmatrext_updated)
quant_ext = &mpvparse->quantmatrext;
pic_hdr = &mpvparse->pichdr;
GST_DEBUG_OBJECT (mpvparse,
"Adding GstMpegVideoMeta (slice_count:%d, slice_offset:%d)",
mpvparse->slice_count, mpvparse->slice_offset);
if (frame->out_buffer) {
buf = frame->out_buffer = gst_buffer_make_writable (frame->out_buffer);
} else {
buf = frame->buffer = gst_buffer_make_writable (frame->buffer);
}
meta =
gst_buffer_add_mpeg_video_meta (buf, seq_hdr, seq_ext, disp_ext,
pic_hdr, pic_ext, quant_ext);
meta->num_slices = mpvparse->slice_count;
meta->slice_offset = mpvparse->slice_offset;
}
return GST_FLOW_OK;
}
