static int dvbsub_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size) { DVBSubParseContext *pc = s->priv_data; uint8_t *p, *p_end; int i, len, buf_pos = 0; av_dlog(avctx, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n", s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]); for (i=0; i < buf_size; i++) { av_dlog(avctx, "%02x ", buf[i]); if (i % 16 == 15) av_dlog(avctx, "\n"); } if (i % 16 != 0) av_dlog(avctx, "\n"); *poutbuf = NULL; *poutbuf_size = 0; s->fetch_timestamp = 1; if (s->last_pts != s->pts && s->pts != AV_NOPTS_VALUE) /* Start of a new packet */ { if (pc->packet_index != pc->packet_start) { av_dlog(avctx, "Discarding %d bytes\n", pc->packet_index - pc->packet_start); } pc->packet_start = 0; pc->packet_index = 0; if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) { av_dlog(avctx, "Bad packet header\n"); return -1; } buf_pos = 2; pc->in_packet = 1; } else { if (pc->packet_start != 0) { if (pc->packet_index != pc->packet_start) { memmove(pc->packet_buf, pc->packet_buf + pc->packet_start, pc->packet_index - pc->packet_start); pc->packet_index -= pc->packet_start; pc->packet_start = 0; } else { pc->packet_start = 0; pc->packet_index = 0; } } } if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE) return -1; /* if not currently in a packet, discard data */ if (pc->in_packet == 0) return buf_size; memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos); pc->packet_index += buf_size - buf_pos; p = pc->packet_buf; p_end = pc->packet_buf + pc->packet_index; while (p < p_end) { if (*p == 0x0f) { if (p + 6 <= p_end) { len = AV_RB16(p + 4); if (p + len + 6 <= p_end) { *poutbuf_size += len + 6; p += len + 6; } else break; } else break; } else if (*p == 0xff) { if (p + 1 < p_end) { av_dlog(avctx, "Junk at end of packet\n"); } pc->packet_index = p - pc->packet_buf; pc->in_packet = 0; break; } else { av_log(avctx, AV_LOG_ERROR, "Junk in packet\n"); pc->packet_index = p - pc->packet_buf; pc->in_packet = 0; break; } } if (*poutbuf_size > 0) { *poutbuf = pc->packet_buf; pc->packet_start = *poutbuf_size; } if (s->pts == AV_NOPTS_VALUE) s->pts = s->last_pts; return buf_size; }