From 8f8caca2242e1fe05f37493cfabcd3f4de198550 Mon Sep 17 00:00:00 2001
From: Fredrik Axelsson <fraxbe@gmail.com>
Date: Sat, 29 Nov 2014 17:53:45 +0100
Subject: [PATCH] Add support for BDAV/m2ts-mode muxing

Signed-off-by: Fredrik Axelsson <fraxbe@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/mpegtsenc.c | 42 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 108265050a..e68ad1abe0 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -78,6 +78,7 @@ typedef struct MpegTSWrite {
 
     int pmt_start_pid;
     int start_pid;
+    int m2ts_mode;
 
     int reemit_pat_pmt; // backward compatibility
 
@@ -465,9 +466,28 @@ static MpegTSService *mpegts_add_service(MpegTSWrite *ts, int sid,
     return service;
 }
 
+static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
+{
+    return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
+           ts->first_pcr;
+}
+
+static void mpegts_prefix_m2ts_header(AVFormatContext *s)
+{
+    MpegTSWrite *ts = s->priv_data;
+    if (ts->m2ts_mode) {
+        int64_t pcr = get_pcr(s->priv_data, s->pb);
+        uint32_t tp_extra_header = pcr % 0x3fffffff;
+        tp_extra_header = AV_RB32(&tp_extra_header);
+        avio_write(s->pb, (unsigned char *) &tp_extra_header,
+                   sizeof(tp_extra_header));
+    }
+}
+
 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
 {
     AVFormatContext *ctx = s->opaque;
+    mpegts_prefix_m2ts_header(ctx);
     avio_write(ctx->pb, packet, TS_PACKET_SIZE);
 }
 
@@ -665,6 +685,14 @@ static int mpegts_write_header(AVFormatContext *s)
            service->pcr_packet_period,
            ts->sdt_packet_period, ts->pat_packet_period);
 
+    if (ts->m2ts_mode == -1) {
+        if (av_match_ext(s->filename, "m2ts")) {
+            ts->m2ts_mode = 1;
+        } else {
+            ts->m2ts_mode = 0;
+        }
+    }
+
     avio_flush(s->pb);
 
     return 0;
@@ -705,12 +733,6 @@ static void retransmit_si_info(AVFormatContext *s)
     }
 }
 
-static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
-{
-    return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
-           ts->first_pcr;
-}
-
 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
 {
     int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
@@ -737,6 +759,7 @@ static void mpegts_insert_null_packet(AVFormatContext *s)
     *q++ = 0xff;
     *q++ = 0x10;
     memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
+    mpegts_prefix_m2ts_header(s);
     avio_write(s->pb, buf, TS_PACKET_SIZE);
 }
 
@@ -762,6 +785,7 @@ static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
 
     /* stuffing bytes */
     memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
+    mpegts_prefix_m2ts_header(s);
     avio_write(s->pb, buf, TS_PACKET_SIZE);
 }
 
@@ -993,6 +1017,7 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
         memcpy(buf + TS_PACKET_SIZE - len, payload, len);
         payload      += len;
         payload_size -= len;
+        mpegts_prefix_m2ts_header(s);
         avio_write(s->pb, buf, TS_PACKET_SIZE);
     }
     avio_flush(s->pb);
@@ -1206,6 +1231,9 @@ static const AVOption options[] = {
     { "mpegts_start_pid", "Set the first pid.",
       offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT,
       { .i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM },
+    {"mpegts_m2ts_mode", "Enable m2ts mode.",
+      offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT,
+      { .i64 = -1 }, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
     { "muxrate", NULL,
       offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT,
       { .i64 = 1 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
@@ -1242,7 +1270,7 @@ AVOutputFormat ff_mpegts_muxer = {
     .name           = "mpegts",
     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
     .mime_type      = "video/x-mpegts",
-    .extensions     = "ts,m2t",
+    .extensions     = "ts,m2t,m2ts",
     .priv_data_size = sizeof(MpegTSWrite),
     .audio_codec    = AV_CODEC_ID_MP2,
     .video_codec    = AV_CODEC_ID_MPEG2VIDEO,