[FFmpeg-devel] [PATCH] avformat/mpegts: Add -reprobe_stream_if_pmt_es_stream_type_changes option

[Pavel Koshevoy <pkoshevoy-at-gmail.com@ffmpeg.org>]

Make runtime AVStream.codecpar codec_id updates optional and disabled
by default, so that avformat API clients can enable this feature explicitly
when they add support for runtime codec changes.
---
 libavformat/mpegts.c | 8 +++++++-
 tests/fate/demux.mak | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index deb69a0548..88b1754307 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -156,6 +156,8 @@ struct MpegTSContext {
     /** to detect seek */
     int64_t last_pos;
 
+    int reprobe_stream_if_pmt_es_stream_type_changes;
+
     int skip_changes;
     int skip_clear;
     int skip_unknown_pmt;
@@ -199,6 +201,8 @@ static const AVOption options[] = {
     MPEGTS_OPTIONS,
     {"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
      {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
+    {"reprobe_stream_if_pmt_es_stream_type_changes", "allow PMT updates to change codec_type and codec_id at runtime",
+     offsetof(MpegTSContext, reprobe_stream_if_pmt_es_stream_type_changes), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     {"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
      {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
     {"skip_unknown_pmt", "skip PMTs for programs not advertised in the PAT", offsetof(MpegTSContext, skip_unknown_pmt), AV_OPT_TYPE_BOOL,
@@ -2510,7 +2514,9 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
         if (!st)
             goto out;
 
-        if (pes && pes->stream_type != stream_type)
+        if (pes && (!pes->stream_type ||
+                    (pes->stream_type != stream_type &&
+                     ts->reprobe_stream_if_pmt_es_stream_type_changes)))
             mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
 
         add_pid_to_program(prg, pid);
diff --git a/tests/fate/demux.mak b/tests/fate/demux.mak
index ead5ad4b10..6e5e2eb81a 100644
--- a/tests/fate/demux.mak
+++ b/tests/fate/demux.mak
@@ -158,7 +158,7 @@ FATE_SAMPLES_DEMUX-$(CONFIG_XWMA_DEMUXER) += fate-xwma-demux
 fate-xwma-demux: CMD = crc -i $(TARGET_SAMPLES)/xwma/ergon.xwma -c:a copy
 
 FATE_FFPROBE_DEMUX-$(CONFIG_MPEGTS_DEMUXER) += fate-ts-demux
-fate-ts-demux: CMD = ffprobe_demux $(TARGET_SAMPLES)/ac3/mp3ac325-4864-small.ts
+fate-ts-demux: CMD = ffprobe_demux $(TARGET_SAMPLES)/ac3/mp3ac325-4864-small.ts -reprobe_stream_if_pmt_es_stream_type_changes 1
 
 FATE_FFPROBE_DEMUX-$(CONFIG_MPEGTS_DEMUXER) += fate-ts-timed-id3-demux
 fate-ts-timed-id3-demux: CMD = ffprobe_demux $(TARGET_SAMPLES)/mpegts/id3.ts
-- 
2.43.0

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