[FFmpeg-devel] [PATCH 1/2] v4 - SCTE extraction from mpegts

[Carlos Fernandez Sanz]

From: Carlos <carlos at ccextractor.org>

Signed-off-by: carlos <carlos at ccextractor.org>
---
 libavcodec/avcodec.h    |  1 +
 libavcodec/codec_desc.c |  6 ++++++
 libavformat/mpegts.c    | 43 ++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 3b21537..601ee5c 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -630,6 +630,7 @@ enum AVCodecID {
     /* other specific kind of codecs (generally used for attachments) */
     AV_CODEC_ID_FIRST_UNKNOWN = 0x18000,           ///< A dummy ID pointing at the start of various fake codecs.
     AV_CODEC_ID_TTF = 0x18000,
+    AV_CODEC_ID_SCTE_35,
 
     AV_CODEC_ID_BINTEXT    = 0x18800,
     AV_CODEC_ID_XBIN,
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index dea17c9..5c00be0 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -2950,6 +2950,12 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("binary data"),
         .mime_types= MT("application/octet-stream"),
     },
+    {
+        .id        = AV_CODEC_ID_SCTE_35,
+        .type      = AVMEDIA_TYPE_DATA,
+        .name      = "scte_35",
+        .long_name = NULL_IF_CONFIG_SMALL("SCTE 35 Message Queue"),
+    },
 
     /* deprecated codec ids */
 };
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index b31d233..4185af0 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -57,6 +57,7 @@ enum MpegTSFilterType {
     MPEGTS_PES,
     MPEGTS_SECTION,
     MPEGTS_PCR,
+    MPEGTS_DATA,
 };
 
 typedef struct MpegTSFilter MpegTSFilter;
@@ -510,6 +511,11 @@ static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
     return mpegts_open_filter(ts, pid, MPEGTS_PCR);
 }
 
+static MpegTSFilter *mpegts_open_data_filter(MpegTSContext *ts, unsigned int pid)
+{
+    return mpegts_open_filter(ts, pid, MPEGTS_DATA);
+}
+
 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
 {
     int pid;
@@ -725,6 +731,12 @@ static const StreamType HDMV_types[] = {
     { 0 },
 };
 
+/* SCTE types */
+static const StreamType SCTE_types[] = {
+    { 0x86, AVMEDIA_TYPE_DATA,  AV_CODEC_ID_SCTE_35    },
+    { 0 },
+};
+
 /* ATSC ? */
 static const StreamType MISC_types[] = {
     { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
@@ -872,6 +884,13 @@ static void reset_pes_packet_state(PESContext *pes)
     av_buffer_unref(&pes->buffer);
 }
 
+static void new_data_packet(const uint8_t *buffer, int len, AVPacket *pkt)
+{
+    av_init_packet(pkt);
+    pkt->data = buffer;
+    pkt->size = len;
+}
+
 static int new_pes_packet(PESContext *pes, AVPacket *pkt)
 {
     char *sd;
@@ -1975,6 +1994,19 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
                 pes->st->id = pes->pid;
             }
             st = pes->st;
+        } else if (stream_type == 0x86 && prog_reg_desc ==  AV_RL32("CUEI")) {
+            int idx = ff_find_stream_index(ts->stream, pid);
+            if (idx >= 0) {
+                st = ts->stream->streams[idx];
+            } else {
+                st = avformat_new_stream(ts->stream, NULL);
+                if (!st)
+                    goto out;
+                st->id = pid;
+                st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
+                mpegts_find_stream_type(st, stream_type, SCTE_types);
+                mpegts_open_data_filter(ts, pid);
+            }
         } else if (stream_type != 0x13) {
             if (ts->pids[pid])
                 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
@@ -2317,7 +2349,14 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
                 }
             }
         }
-
+    } else if (tss->type == MPEGTS_DATA) {
+        int idx = ff_find_stream_index(ts->stream, pid);
+        p++;
+        new_data_packet(p,p_end - p, ts->pkt);
+        if (idx >= 0) {
+            ts->pkt->stream_index = idx;
+        }
+        ts->stop_parse = 1;
     } else {
         int ret;
         // Note: The position here points actually behind the current packet.
@@ -2730,6 +2769,8 @@ static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
                     ret = 0;
                     break;
                 }
+            } else if (ts->pids[i] && ts->pids[i]->type == MPEGTS_DATA) {
+                return ret;
             }
     }
 
-- 
2.7.4