/* for off == 0 initial code; returns TRUE if code starts a frame,
* otherwise returns TRUE if code terminates preceding frame */
static gboolean
gst_mpegv_parse_process_sc (GstMpegvParse * mpvparse, GstBuffer * buf, gint off)
{
gboolean ret = FALSE, do_seq = TRUE;
guint8 *data;
guint code;
g_return_val_if_fail (buf && GST_BUFFER_SIZE (buf) >= 4, FALSE);
data = GST_BUFFER_DATA (buf);
code = data[off + 3];
GST_LOG_OBJECT (mpvparse, "process startcode %x (%s)", code,
picture_start_code_name (code));
switch (code) {
case MPEG_PACKET_PICTURE:
GST_LOG_OBJECT (mpvparse, "startcode is PICTURE");
/* picture is aggregated with preceding sequence/gop, if any.
* so, picture start code only ends if already a previous one */
if (mpvparse->pic_offset < 0)
mpvparse->pic_offset = off;
else
ret = TRUE;
if (!off)
ret = TRUE;
break;
case MPEG_PACKET_SEQUENCE:
GST_LOG_OBJECT (mpvparse, "startcode is SEQUENCE");
if (off == 0)
mpvparse->seq_offset = off;
ret = TRUE;
break;
case MPEG_PACKET_GOP:
GST_LOG_OBJECT (mpvparse, "startcode is GOP");
if (mpvparse->seq_offset >= 0)
ret = mpvparse->gop_split;
else
ret = TRUE;
break;
default:
do_seq = FALSE;
break;
}
/* process config data */
if (G_UNLIKELY (mpvparse->seq_offset >= 0 && off && do_seq)) {
g_assert (mpvparse->seq_offset == 0);
gst_mpegv_parse_process_config (mpvparse, GST_BUFFER_DATA (buf), off);
/* avoid accepting again for a PICTURE sc following a GOP sc */
mpvparse->seq_offset = -1;
}
/* extract some picture info if there is any in the frame being terminated */
if (G_UNLIKELY (ret && off)) {
if (G_LIKELY (mpvparse->pic_offset >= 0 && mpvparse->pic_offset < off)) {
if (G_LIKELY (GST_BUFFER_SIZE (buf) >= mpvparse->pic_offset + 6)) {
gint pct = (data[mpvparse->pic_offset + 5] >> 3) & 0x7;
GST_LOG_OBJECT (mpvparse, "picture_coding_type %d (%s)", pct,
picture_type_name (pct));
mpvparse->intra_frame = (pct == MPEG_PICTURE_TYPE_I);
} else {
GST_WARNING_OBJECT (mpvparse, "no data following PICTURE startcode");
mpvparse->intra_frame = FALSE;
}
} else {
/* for off == 4 initial code; returns TRUE if code starts a frame
* otherwise returns TRUE if code terminates preceding frame */
static gboolean
gst_mpegv_parse_process_sc (GstMpegvParse * mpvparse,
GstBuffer * buf, gint off, guint8 code)
{
gboolean ret = FALSE, packet = TRUE;
g_return_val_if_fail (buf && gst_buffer_get_size (buf) >= 4, FALSE);
GST_LOG_OBJECT (mpvparse, "process startcode %x (%s)", code,
picture_start_code_name (code));
switch (code) {
case GST_MPEG_VIDEO_PACKET_PICTURE:
GST_LOG_OBJECT (mpvparse, "startcode is PICTURE");
/* picture is aggregated with preceding sequence/gop, if any.
* so, picture start code only ends if already a previous one */
if (mpvparse->pic_offset < 0)
mpvparse->pic_offset = off;
else
ret = (off != mpvparse->pic_offset);
/* but it's a valid starting one */
if (off == 4)
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_SEQUENCE:
GST_LOG_OBJECT (mpvparse, "startcode is SEQUENCE");
if (mpvparse->seq_offset < 0)
mpvparse->seq_offset = off;
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_GOP:
GST_LOG_OBJECT (mpvparse, "startcode is GOP");
if (mpvparse->seq_offset >= 0)
ret = mpvparse->gop_split;
else
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_EXTENSION:
GST_LOG_OBJECT (mpvparse, "startcode is VIDEO PACKET EXTENSION");
parse_picture_extension (mpvparse, buf, off);
if (mpvparse->ext_count < G_N_ELEMENTS (mpvparse->ext_offsets))
mpvparse->ext_offsets[mpvparse->ext_count++] = off;
/* fall-through */
default:
packet = FALSE;
break;
}
/* set size to avoid processing config again */
if (mpvparse->seq_offset >= 0 && off != mpvparse->seq_offset &&
!mpvparse->seq_size && packet) {
/* should always be at start */
g_assert (mpvparse->seq_offset <= 4);
gst_mpegv_parse_process_config (mpvparse, buf, off - mpvparse->seq_offset);
mpvparse->seq_size = off - mpvparse->seq_offset;
}
/* extract some picture info if there is any in the frame being terminated */
if (ret && mpvparse->pic_offset >= 0 && mpvparse->pic_offset < off) {
GstMapInfo map;
gst_buffer_map (buf, &map, GST_MAP_READ);
if (gst_mpeg_video_parse_picture_header (&mpvparse->pichdr,
map.data, map.size, mpvparse->pic_offset))
GST_LOG_OBJECT (mpvparse, "picture_coding_type %d (%s), ending"
"frame of size %d", mpvparse->pichdr.pic_type,
picture_type_name (mpvparse->pichdr.pic_type), off - 4);
else
GST_LOG_OBJECT (mpvparse, "Couldn't parse picture at offset %d",
mpvparse->pic_offset);
gst_buffer_unmap (buf, &map);
}
return ret;
}
/* for off == 4 initial code; returns TRUE if code starts a frame
* otherwise returns TRUE if code terminates preceding frame */
static gboolean
gst_mpegv_parse_process_sc (GstMpegvParse * mpvparse,
GstMapInfo * info, gint off, GstMpegVideoPacket * packet)
{
gboolean ret = FALSE, checkconfig = TRUE;
GST_LOG_OBJECT (mpvparse, "process startcode %x (%s) offset:%d", packet->type,
picture_start_code_name (packet->type), off);
switch (packet->type) {
case GST_MPEG_VIDEO_PACKET_PICTURE:
GST_LOG_OBJECT (mpvparse, "startcode is PICTURE");
/* picture is aggregated with preceding sequence/gop, if any.
* so, picture start code only ends if already a previous one */
if (mpvparse->pic_offset < 0)
mpvparse->pic_offset = off;
else
ret = (off != mpvparse->pic_offset);
/* but it's a valid starting one */
if (off == 4)
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_SEQUENCE:
GST_LOG_OBJECT (mpvparse, "startcode is SEQUENCE");
if (mpvparse->seq_offset < 0)
mpvparse->seq_offset = off;
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_GOP:
GST_LOG_OBJECT (mpvparse, "startcode is GOP");
if (mpvparse->seq_offset >= 0)
ret = mpvparse->gop_split;
else
ret = TRUE;
break;
case GST_MPEG_VIDEO_PACKET_EXTENSION:
GST_LOG_OBJECT (mpvparse, "startcode is VIDEO PACKET EXTENSION");
parse_packet_extension (mpvparse, info, off);
if (mpvparse->ext_count < G_N_ELEMENTS (mpvparse->ext_offsets))
mpvparse->ext_offsets[mpvparse->ext_count++] = off;
checkconfig = FALSE;
break;
default:
if (GST_MPEG_VIDEO_PACKET_IS_SLICE (packet->type)) {
mpvparse->slice_count++;
if (mpvparse->slice_offset == 0)
mpvparse->slice_offset = off - 4;
}
checkconfig = FALSE;
break;
}
/* set size to avoid processing config again */
if (checkconfig && mpvparse->seq_offset >= 0 && off != mpvparse->seq_offset &&
!mpvparse->seq_size) {
/* should always be at start */
g_assert (mpvparse->seq_offset <= 4);
gst_mpegv_parse_process_config (mpvparse, info, off - mpvparse->seq_offset);
mpvparse->seq_size = off - mpvparse->seq_offset;
}
/* extract some picture info if there is any in the frame being terminated */
if (ret && mpvparse->pic_offset >= 0 && mpvparse->pic_offset < off) {
GstMpegVideoPacket header;
header.data = info->data;
header.type = GST_MPEG_VIDEO_PACKET_PICTURE;
header.offset = mpvparse->pic_offset;
header.size = info->size - mpvparse->pic_offset;
if (gst_mpeg_video_packet_parse_picture_header (&header, &mpvparse->pichdr))
GST_LOG_OBJECT (mpvparse, "picture_coding_type %d (%s), ending"
"frame of size %d", mpvparse->pichdr.pic_type,
picture_type_name (mpvparse->pichdr.pic_type), off - 4);
else
GST_LOG_OBJECT (mpvparse, "Couldn't parse picture at offset %d",
mpvparse->pic_offset);
}
return ret;
}
