Export more transport stream information.

with minor addition to the comment by michael

libavformat/avformat.h

@@ -647,6 +647,9 @@ typedef struct AVProgram {
     unsigned int   *stream_index;
     unsigned int   nb_stream_indexes;
     AVMetadata *metadata;
+
+    int program_num;
+    int pmt_pid;
 } AVProgram;
 
 #define AVFMTCTX_NOHEADER      0x0001 /**< signal that no header is present
@@ -844,6 +847,12 @@ typedef struct AVFormatContext {
      * decoding: number of frames used to probe fps
      */
     int fps_probe_size;
+
+    /**
+     * Transport stream id.
+     * This will be moved into demuxer private options. Thus no API/ABI compatibility
+     */
+    int ts_id;
 } AVFormatContext;
 
 typedef struct AVPacketList {

libavformat/mpegts.c

@@ -1137,6 +1137,7 @@ static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
     SectionHeader h1, *h = &h1;
     const uint8_t *p, *p_end;
     int sid, pmt_pid;
+    AVProgram *program;
 
 #ifdef DEBUG
     av_dlog(ts->stream, "PAT:\n");
@@ -1149,6 +1150,8 @@ static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
     if (h->tid != PAT_TID)
         return;
 
+    ts->stream->ts_id = h->id;
+
     clear_programs(ts);
     for(;;) {
         sid = get16(&p, p_end);
@@ -1163,7 +1166,9 @@ static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
         if (sid == 0x0000) {
             /* NIT info */
         } else {
-            av_new_program(ts->stream, sid);
+            program = av_new_program(ts->stream, sid);
+            program->program_num = sid;
+            program->pmt_pid = pmt_pid;
             if (ts->pids[pmt_pid])
                 mpegts_close_filter(ts, ts->pids[pmt_pid]);
             mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);