static int handle_packet(MpegTSContext *ts, const uint8_t *packet) { AVFormatContext *s = ts->stream; MpegTSFilter *tss; int len, pid, cc, cc_ok, afc, is_start; const uint8_t *p, *p_end; int64_t pos; pid = AV_RB16(packet + 1) & 0x1fff; if(pid && discard_pid(ts, pid)) return 0; is_start = packet[1] & 0x40; tss = ts->pids[pid]; if (ts->auto_guess && tss == NULL && is_start) { add_pes_stream(ts, pid, -1, 0); tss = ts->pids[pid]; } if (!tss) return 0; /* continuity check (currently not used) */ cc = (packet[3] & 0xf); cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc)); tss->last_cc = cc; /* skip adaptation field */ afc = (packet[3] >> 4) & 3; p = packet + 4; if (afc == 0) /* reserved value */ return 0; if (afc == 2) /* adaptation field only */ return 0; if (afc == 3) { /* skip adapation field */ p += p[0] + 1; } /* if past the end of packet, ignore */ p_end = packet + TS_PACKET_SIZE; if (p >= p_end) return 0; pos = url_ftell(ts->stream->pb); ts->pos47= pos % ts->raw_packet_size; if (tss->type == MPEGTS_SECTION) { if (is_start) { /* pointer field present */ len = *p++; if (p + len > p_end) return 0; if (len && cc_ok) { /* write remaining section bytes */ write_section_data(s, tss, p, len, 0); /* check whether filter has been closed */ if (!ts->pids[pid]) return 0; } p += len; if (p < p_end) { write_section_data(s, tss, p, p_end - p, 1); } } else { if (cc_ok) { write_section_data(s, tss, p, p_end - p, 0); } } } else { int ret; // Note: The position here points actually behind the current packet. if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start, pos - ts->raw_packet_size)) < 0) return ret; } return 0; }