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 void
gst_mpegv_parse_reset (GstMpegvParse * mpvparse)
{
gst_mpegv_parse_reset_frame (mpvparse);
mpvparse->profile = 0;
mpvparse->update_caps = TRUE;
gst_buffer_replace (&mpvparse->config, NULL);
memset (&mpvparse->params, 0, sizeof (mpvparse->params));
}
static inline void
update_frame_parsing_status (GstMpegvParse * mpvparse,
GstBaseParseFrame * frame)
{
/* avoid stale cached parsing state */
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME) {
GST_LOG_OBJECT (mpvparse, "parsing new frame");
gst_mpegv_parse_reset_frame (mpvparse);
} else {
GST_LOG_OBJECT (mpvparse, "resuming frame parsing");
}
}
static void
gst_mpegv_parse_reset (GstMpegvParse * mpvparse)
{
gst_mpegv_parse_reset_frame (mpvparse);
mpvparse->profile = 0;
mpvparse->update_caps = TRUE;
mpvparse->send_codec_tag = TRUE;
gst_buffer_replace (&mpvparse->config, NULL);
memset (&mpvparse->sequencehdr, 0, sizeof (mpvparse->sequencehdr));
memset (&mpvparse->sequenceext, 0, sizeof (mpvparse->sequenceext));
memset (&mpvparse->pichdr, 0, sizeof (mpvparse->pichdr));
}
static void
gst_mpegv_parse_reset (GstMpegvParse * mpvparse)
{
gst_mpegv_parse_reset_frame (mpvparse);
mpvparse->profile = 0;
mpvparse->update_caps = TRUE;
mpvparse->send_codec_tag = TRUE;
mpvparse->send_mpeg_meta = TRUE;
gst_buffer_replace (&mpvparse->config, NULL);
memset (&mpvparse->sequencehdr, 0, sizeof (mpvparse->sequencehdr));
memset (&mpvparse->sequenceext, 0, sizeof (mpvparse->sequenceext));
memset (&mpvparse->sequencedispext, 0, sizeof (mpvparse->sequencedispext));
memset (&mpvparse->pichdr, 0, sizeof (mpvparse->pichdr));
memset (&mpvparse->picext, 0, sizeof (mpvparse->picext));
mpvparse->seqhdr_updated = FALSE;
mpvparse->seqext_updated = FALSE;
mpvparse->seqdispext_updated = FALSE;
mpvparse->picext_updated = FALSE;
mpvparse->quantmatrext_updated = FALSE;
}
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;
}
