static int
parse_pgs_packet (GstDVDSpu * dvdspu, guint8 type, guint8 * payload,
guint16 len)
{
SpuPgsState *pgs_state = &dvdspu->spu_state.pgs;
int ret = 0;
if (!pgs_state->in_presentation_segment
&& type != PGS_COMMAND_PRESENTATION_SEGMENT) {
PGS_DUMP ("Expected BEGIN PRESENTATION SEGMENT command. "
"Got command type 0x%02x len %u. Skipping\n", type, len);
return 0;
}
switch (type) {
case PGS_COMMAND_PRESENTATION_SEGMENT:
PGS_DUMP ("*******************************************\n"
"Begin PRESENTATION_SEGMENT (0x%02x) packet len %u\n", type, len);
pgs_state->in_presentation_segment =
pgs_state->have_presentation_segment = TRUE;
ret = parse_presentation_segment (dvdspu, type, payload, len);
break;
case PGS_COMMAND_SET_OBJECT_DATA:
PGS_DUMP ("*** Set Object Data (0x%02x) packet len %u\n", type, len);
ret = parse_set_object_data (dvdspu, type, payload, len);
break;
case PGS_COMMAND_SET_PALETTE:
PGS_DUMP ("*** Set Palette (0x%02x) packet len %u\n", type, len);
ret = parse_set_palette (dvdspu, type, payload, len);
break;
case PGS_COMMAND_SET_WINDOW:
PGS_DUMP ("*** Set Window command (0x%02x) packet len %u\n", type, len);
ret = parse_set_window (dvdspu, type, payload, len);
break;
case PGS_COMMAND_INTERACTIVE_SEGMENT:
PGS_DUMP ("*** Interactive Segment command(0x%02x) packet len %u\n",
type, len);
dump_bytes (payload, len);
break;
case PGS_COMMAND_END_DISPLAY:
PGS_DUMP ("*** End Display command (0x%02x) packet len %u\n", type,
len);
pgs_state->in_presentation_segment = FALSE;
break;
default:
GST_ERROR ("Unknown PGS command: type 0x%02x len %u", type, len);
dump_bytes (payload, len);
break;
}
PGS_DUMP ("\n");
return ret;
}
static int decode(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
const uint8_t *buf_end;
uint8_t segment_type;
int segment_length;
#ifdef DEBUG_PACKET_CONTENTS
int i;
av_log(avctx, AV_LOG_INFO, "PGS sub packet:\n");
for (i = 0; i < buf_size; i++) {
av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
if (i % 16 == 15)
av_log(avctx, AV_LOG_INFO, "\n");
}
if (i & 15)
av_log(avctx, AV_LOG_INFO, "\n");
#endif
*data_size = 0;
/* Ensure that we have received at a least a segment code and segment length */
if (buf_size < 3)
return -1;
buf_end = buf + buf_size;
/* Step through buffer to identify segments */
while (buf < buf_end) {
segment_type = bytestream_get_byte(&buf);
segment_length = bytestream_get_be16(&buf);
av_dlog(avctx, "Segment Length %d, Segment Type %x\n", segment_length, segment_type);
if (segment_type != DISPLAY_SEGMENT && segment_length > buf_end - buf)
break;
switch (segment_type) {
case PALETTE_SEGMENT:
parse_palette_segment(avctx, buf, segment_length);
break;
case PICTURE_SEGMENT:
parse_picture_segment(avctx, buf, segment_length);
break;
case PRESENTATION_SEGMENT:
parse_presentation_segment(avctx, buf, segment_length);
break;
case WINDOW_SEGMENT:
/*
* Window Segment Structure (No new information provided):
* 2 bytes: Unkown,
* 2 bytes: X position of subtitle,
* 2 bytes: Y position of subtitle,
* 2 bytes: Width of subtitle,
* 2 bytes: Height of subtitle.
*/
break;
case DISPLAY_SEGMENT:
*data_size = display_end_segment(avctx, data, buf, segment_length);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown subtitle segment type 0x%x, length %d\n",
segment_type, segment_length);
break;
}
buf += segment_length;
}
return buf_size;
}
