Re: [FFmpeg-devel] [PATCH] avformat/mpegts: set data broadcast streams as such

[TADANO Tokumei <aimingoff@pc.nifty.jp>]

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@24i.com>
> 
> Additionally, they should not be probed, as this is essentially
> various types of binary data.
> 
> Signed-off-by: Jan Ekström <jan.ekstrom@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/

> +                    uint8_t  component_tag     = get8(&p, p_end);

s/p_end/desc_end/

> +                    if (!component_tag)
> +                        // 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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