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avformat/mpegts: Improve the position determination for avpriv_mpegts_parse_packet()

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Fixes: assertion failure
Fixes: Ticket 8005

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-01-27 19:07:00 +01:00
parent 516e9b9d72
commit e5bb48ae59
1 changed files with 3 additions and 5 deletions
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8
libavformat/mpegts.c
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@ -2643,13 +2643,12 @@ static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
const uint8_t *packet); const uint8_t *packet);
/* handle one TS packet */ /* handle one TS packet */
static int handle_packet(MpegTSContext *ts, const uint8_t *packet) static int handle_packet(MpegTSContext *ts, const uint8_t *packet, int64_t pos)
{ {
MpegTSFilter *tss; MpegTSFilter *tss;
int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity, int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
has_adaptation, has_payload; has_adaptation, has_payload;
const uint8_t *p, *p_end; const uint8_t *p, *p_end;
int64_t pos;
pid = AV_RB16(packet + 1) & 0x1fff; pid = AV_RB16(packet + 1) & 0x1fff;
is_start = packet[1] & 0x40; is_start = packet[1] & 0x40;
@ -2716,7 +2715,6 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
if (p >= p_end || !has_payload) if (p >= p_end || !has_payload)
return 0; return 0;
pos = avio_tell(ts->stream->pb);
if (pos >= 0) { if (pos >= 0) {
av_assert0(pos >= TS_PACKET_SIZE); av_assert0(pos >= TS_PACKET_SIZE);
ts->pos47_full = pos - TS_PACKET_SIZE; ts->pos47_full = pos - TS_PACKET_SIZE;
@ -2927,7 +2925,7 @@ static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
ret = read_packet(s, packet, ts->raw_packet_size, &data); ret = read_packet(s, packet, ts->raw_packet_size, &data);
if (ret != 0) if (ret != 0)
break; break;
ret = handle_packet(ts, data); ret = handle_packet(ts, data, avio_tell(s->pb));
finished_reading_packet(s, ts->raw_packet_size); finished_reading_packet(s, ts->raw_packet_size);
if (ret != 0) if (ret != 0)
break; break;
@ -3321,7 +3319,7 @@ int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
buf++; buf++;
len--; len--;
} else { } else {
handle_packet(ts, buf); handle_packet(ts, buf, len1 - len + TS_PACKET_SIZE);
buf += TS_PACKET_SIZE; buf += TS_PACKET_SIZE;
len -= TS_PACKET_SIZE; len -= TS_PACKET_SIZE;
if (ts->stop_parse == 1) if (ts->stop_parse == 1)