pts and dts support in parser API

Originally committed as revision 2619 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -17,7 +17,7 @@ extern "C" {
 
 #define FFMPEG_VERSION_INT     0x000408
 #define FFMPEG_VERSION         "0.4.8"
-#define LIBAVCODEC_BUILD       4696
+#define LIBAVCODEC_BUILD       4697
 
 #define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
 #define LIBAVCODEC_VERSION     FFMPEG_VERSION
@@ -1932,8 +1932,18 @@ typedef struct AVCodecParserContext {
     /* video info */
     int pict_type; /* XXX: put it back in AVCodecContext */
     int repeat_pict; /* XXX: put it back in AVCodecContext */
-    int64_t pts;     /* in us, if given by the codec (used by raw mpeg4) */
-    int64_t dts;     /* in us, if given by the codec (used by raw mpeg4) */
+    int64_t pts;     /* pts of the current frame */
+    int64_t dts;     /* dts of the current frame */
+
+    /* private data */
+    int64_t last_pts;
+    int64_t last_dts;
+
+#define AV_PARSER_PTS_NB 4
+    int cur_frame_start_index;
+    int64_t cur_frame_offset[AV_PARSER_PTS_NB];
+    int64_t cur_frame_pts[AV_PARSER_PTS_NB];
+    int64_t cur_frame_dts[AV_PARSER_PTS_NB];
 } AVCodecParserContext;
 
 typedef struct AVCodecParser {
@@ -1955,7 +1965,8 @@ AVCodecParserContext *av_parser_init(int codec_id);
 int av_parser_parse(AVCodecParserContext *s, 
                     AVCodecContext *avctx,
                     uint8_t **poutbuf, int *poutbuf_size, 
-                    const uint8_t *buf, int buf_size);
+                    const uint8_t *buf, int buf_size,
+                    int64_t pts, int64_t dts);
 void av_parser_close(AVCodecParserContext *s);
 
 extern AVCodecParser mpegvideo_parser;

libavcodec/parser.c

@@ -68,23 +68,56 @@ AVCodecParserContext *av_parser_init(int codec_id)
 int av_parser_parse(AVCodecParserContext *s, 
                     AVCodecContext *avctx,
                     uint8_t **poutbuf, int *poutbuf_size, 
-                    const uint8_t *buf, int buf_size)
+                    const uint8_t *buf, int buf_size,
+                    int64_t pts, int64_t dts)
 {
-    int index;
+    int index, i, k;
     uint8_t dummy_buf[FF_INPUT_BUFFER_PADDING_SIZE];
     
     if (buf_size == 0) {
         /* padding is always necessary even if EOF, so we add it here */
         memset(dummy_buf, 0, sizeof(dummy_buf));
         buf = dummy_buf;
+    } else {
+        /* add a new packet descriptor */
+        k = (s->cur_frame_start_index + 1) & (AV_PARSER_PTS_NB - 1);
+        s->cur_frame_start_index = k;
+        s->cur_frame_offset[k] = s->cur_offset;
+        s->cur_frame_pts[k] = pts;
+        s->cur_frame_dts[k] = dts;
+
+        /* fill first PTS/DTS */
+        if (s->cur_offset == 0) {
+            s->last_pts = pts;
+            s->last_dts = dts;
+        }
     }
 
     /* WARNING: the returned index can be negative */
     index = s->parser->parser_parse(s, avctx, poutbuf, poutbuf_size, buf, buf_size);
     /* update the file pointer */
     if (*poutbuf_size) {
+        /* fill the data for the current frame */
         s->frame_offset = s->last_frame_offset;
+        s->pts = s->last_pts;
+        s->dts = s->last_dts;
+        
+        /* offset of the next frame */
         s->last_frame_offset = s->cur_offset + index;
+        /* find the packet in which the new frame starts. It
+           is tricky because of MPEG video start codes
+           which can begin in one packet and finish in
+           another packet. In the worst case, an MPEG
+           video start code could be in 4 different
+           packets. */
+        k = s->cur_frame_start_index;
+        for(i = 0; i < AV_PARSER_PTS_NB; i++) {
+            if (s->last_frame_offset >= s->cur_frame_offset[k])
+                break;
+            k = (k - 1) & (AV_PARSER_PTS_NB - 1);
+        }
+        s->last_pts = s->cur_frame_pts[k];
+        s->last_dts = s->cur_frame_dts[k];
     }
     if (index < 0)
         index = 0;