write DTS, based on patch by Luca Abeni, lucabe72 email it

Originally committed as revision 8196 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/mpegtsenc.c

@@ -143,6 +143,7 @@ typedef struct MpegTSWriteStream {
     int cc;
     int payload_index;
     int64_t payload_pts;
+    int64_t payload_dts;
     uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
 } MpegTSWriteStream;
 
@@ -396,6 +397,7 @@ static int mpegts_write_header(AVFormatContext *s)
         ts_st->service = service;
         ts_st->pid = DEFAULT_START_PID + i;
         ts_st->payload_pts = AV_NOPTS_VALUE;
+        ts_st->payload_dts = AV_NOPTS_VALUE;
         /* update PCR pid by using the first video stream */
         if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
             service->pcr_pid == 0x1fff)
@@ -460,15 +462,29 @@ static void retransmit_si_info(AVFormatContext *s)
     }
 }
 
+static void write_pts(uint8_t *q, int fourbits, int64_t pts)
+{
+    int val;
+
+    val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
+    *q++ = val;
+    val = (((pts >> 15) & 0x7fff) << 1) | 1;
+    *q++ = val >> 8;
+    *q++ = val;
+    val = (((pts) & 0x7fff) << 1) | 1;
+    *q++ = val >> 8;
+    *q++ = val;
+}
+
 /* NOTE: pes_data contains all the PES packet */
 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
                              const uint8_t *payload, int payload_size,
-                             int64_t pts)
+                             int64_t pts, int64_t dts)
 {
     MpegTSWriteStream *ts_st = st->priv_data;
     uint8_t buf[TS_PACKET_SIZE];
     uint8_t *q;
-    int val, is_start, len, header_len, write_pcr, private_code;
+    int val, is_start, len, header_len, write_pcr, private_code, flags;
     int afc_len, stuffing_len;
     int64_t pcr = -1; /* avoid warning */
 
@@ -527,13 +543,19 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
                     private_code = 0x20;
                 }
             }
-            if (pts != AV_NOPTS_VALUE)
-                header_len = 8;
-            else
-                header_len = 3;
+            header_len = 0;
+            flags = 0;
+            if (pts != AV_NOPTS_VALUE) {
+                header_len += 5;
+                flags |= 0x80;
+            }
+            if (dts != AV_NOPTS_VALUE) {
+                header_len += 5;
+                flags |= 0x40;
+            }
+            len = payload_size + header_len + 3;
             if (private_code != 0)
-                header_len++;
-            len = payload_size + header_len;
+                len++;
             *q++ = len >> 8;
             *q++ = len;
             val = 0x80;
@@ -541,21 +563,15 @@ static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
             if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
                 val |= 0x04;
             *q++ = val;
+            *q++ = flags;
+            *q++ = header_len;
             if (pts != AV_NOPTS_VALUE) {
-                *q++ = 0x80; /* PTS only */
-                *q++ = 0x05; /* header len */
-                val = (0x02 << 4) |
-                    (((pts >> 30) & 0x07) << 1) | 1;
-                *q++ = val;
-                val = (((pts >> 15) & 0x7fff) << 1) | 1;
-                *q++ = val >> 8;
-                *q++ = val;
-                val = (((pts) & 0x7fff) << 1) | 1;
-                *q++ = val >> 8;
-                *q++ = val;
-            } else {
-                *q++ = 0x00;
-                *q++ = 0x00;
+                write_pts(q, flags >> 6, pts);
+                q += 5;
+            }
+            if (dts != AV_NOPTS_VALUE) {
+                write_pts(q, 1, dts);
+                q += 5;
             }
             if (private_code != 0)
                 *q++ = private_code;
@@ -607,7 +623,7 @@ static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
 
     if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
         /* for subtitle, a single PES packet must be generated */
-        mpegts_write_pes(s, st, buf, size, pkt->pts);
+        mpegts_write_pes(s, st, buf, size, pkt->pts, AV_NOPTS_VALUE);
         return 0;
     }
 
@@ -622,10 +638,13 @@ static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
         ts_st->payload_index += len;
         if (ts_st->payload_pts == AV_NOPTS_VALUE)
             ts_st->payload_pts = pkt->pts;
+        if (ts_st->payload_dts == AV_NOPTS_VALUE)
+            ts_st->payload_dts = pkt->dts;
         if (ts_st->payload_index >= max_payload_size) {
             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
-                             ts_st->payload_pts);
+                             ts_st->payload_pts, ts_st->payload_dts);
             ts_st->payload_pts = AV_NOPTS_VALUE;
+            ts_st->payload_dts = AV_NOPTS_VALUE;
             ts_st->payload_index = 0;
         }
     }
@@ -646,7 +665,7 @@ static int mpegts_write_end(AVFormatContext *s)
         ts_st = st->priv_data;
         if (ts_st->payload_index > 0) {
             mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
-                             ts_st->payload_pts);
+                             ts_st->payload_pts, ts_st->payload_dts);
         }
     }
     put_flush_packet(&s->pb);