[FFmpeg-devel] [PATCH] avformat/mpegts: set data broadcast streams as such
TADANO Tokumei
aimingoff at pc.nifty.jp
Mon Apr 4 19:16:12 EEST 2022
... and, it is better to check broken packet.
On 2022/04/05 1:04, TADANO Tokumei wrote:
> As I posted a patch on Apr. 3rd, you should use "desc_end" rather than "p_end"
> for get16() or get8() to parse each descriptor.
>
> On 2022/04/04 18:53, Jan Ekström wrote:
>> From: Jan Ekström <jan.ekstrom at 24i.com>
>>
>> Additionally, they should not be probed, as this is essentially
>> various types of binary data.
>>
>> Signed-off-by: Jan Ekström <jan.ekstrom at 24i.com>
>> ---
>> libavformat/mpegts.c | 48 +++++++++++++++++++++
>> tests/fate/mpegts.mak | 3 ++
>> tests/ref/fate/mpegts-probe-sdt-data-stream | 14 ++++++
>> 3 files changed, 65 insertions(+)
>> create mode 100644 tests/ref/fate/mpegts-probe-sdt-data-stream
>>
>> diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
>> index da77b50669..3788faf848 100644
>> --- a/libavformat/mpegts.c
>> +++ b/libavformat/mpegts.c
>> @@ -2512,6 +2512,13 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
>> }
>> }
>> p = desc_list_end;
>> +
>> + if (!ts->pkt && (stream_type >= 0x80 && stream_type <= 0xFF) &&
>> + st->codecpar->codec_id == AV_CODEC_ID_NONE)
>> + // if we are reading headers, and still have a user private stream
>> + // with no proper codec set, do not stop reading at PMT. Data
>> + // streams are marked within SDT.
>> + ts->stop_parse = 0;
>> }
>> if (!ts->pids[pcr_pid])
>> @@ -2691,6 +2698,7 @@ static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
>> if (val < 0)
>> return;
>> for (;;) {
>> + struct Program *program = NULL;
>> sid = get16(&p, p_end);
>> if (sid < 0)
>> break;
>> @@ -2704,6 +2712,15 @@ static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
>> desc_list_end = p + desc_list_len;
>> if (desc_list_end > p_end)
>> break;
>> +
>> + program = get_program(ts, sid);
>> +
>> + if (!ts->pkt && program && program->pmt_found)
>> + // if during header reading we have already received a PMT for
>> + // this program and now have received an SDT for it, stop further
>> + // reading at this point.
>> + ts->stop_parse = 2;
>> +
>> for (;;) {
>> desc_tag = get8(&p, desc_list_end);
>> if (desc_tag < 0)
>> @@ -2736,6 +2753,37 @@ static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
>> av_free(name);
>> av_free(provider_name);
>> break;
>> + case 0x64: /* ETSI data broadcast descriptor; EN 300 468 6.2.11 */
>> + {
>> + AVStream *st = NULL;
>> + FFStream *sti = NULL;
>> +
>> + uint16_t data_broadcast_id = get16(&p, p_end); // TS 101 162
>
> s/p_end/desc_end/
if (data_broadcast_id < 0)
break;
>
>> + uint8_t component_tag = get8(&p, p_end);
>
> s/p_end/desc_end/
>
>> + if (!component_tag)
if (component_tag <= 0)
>> + // no stream mapping according to component_tag
>> + break;
>> +
>> + av_log(ts->stream, AV_LOG_TRACE,
>> + "data broadcast id: %d, component tag: %d\n",
>> + data_broadcast_id, component_tag);
>> +
>> + if (!program)
>> + break;
>> +
>> + st = find_matching_stream(ts, 0, sid, component_tag + 1, 0,
>> + program);
>> + if (!st)
>> + break;
>> +
>> + sti = ffstream(st);
>> +
>> + st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
>> + st->codecpar->codec_id = AV_CODEC_ID_BIN_DATA;
>> + sti->request_probe = sti->need_parsing = 0;
>> + sti->need_context_update = 1;
>> + break;
>> + }
>> default:
>> break;
>> }
>> diff --git a/tests/fate/mpegts.mak b/tests/fate/mpegts.mak
>> index bbcbfc47b2..ae21ee87d0 100644
>> --- a/tests/fate/mpegts.mak
>> +++ b/tests/fate/mpegts.mak
>> @@ -19,6 +19,9 @@ FATE_MPEGTS_PROBE-$(call DEMDEC, MPEGTS) += fate-mpegts-probe-pmt-merge
>> fate-mpegts-probe-pmt-merge: SRC = $(TARGET_SAMPLES)/mpegts/pmtchange.ts
>> fate-mpegts-probe-pmt-merge: CMD = run $(PROBE_CODEC_NAME_COMMAND) -merge_pmt_versions 1 -i "$(SRC)"
>> +FATE_MPEGTS_PROBE-$(call DEMDEC, MPEGTS, MP2) += fate-mpegts-probe-sdt-data-stream
>> +fate-mpegts-probe-sdt-data-stream: SRC = $(TARGET_SAMPLES)/mpegts/mpegts_sdt_data_stream.ts
>> +fate-mpegts-probe-sdt-data-stream: CMD = run $(PROBE_CODEC_NAME_COMMAND) -i "$(SRC)"
>> FATE_SAMPLES_FFPROBE += $(FATE_MPEGTS_PROBE-yes)
>> diff --git a/tests/ref/fate/mpegts-probe-sdt-data-stream b/tests/ref/fate/mpegts-probe-sdt-data-stream
>> new file mode 100644
>> index 0000000000..0b8e90962f
>> --- /dev/null
>> +++ b/tests/ref/fate/mpegts-probe-sdt-data-stream
>> @@ -0,0 +1,14 @@
>> +[PROGRAM]
>> +[STREAM]
>> +codec_name=mp2
>> +[/STREAM]
>> +[STREAM]
>> +codec_name=bin_data
>> +[/STREAM]
>> +[/PROGRAM]
>> +[STREAM]
>> +codec_name=mp2
>> +[/STREAM]
>> +[STREAM]
>> +codec_name=bin_data
>> +[/STREAM]
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