Simplify parser core.

Originally committed as revision 13613 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -2837,6 +2837,7 @@ typedef struct AVCodecParserContext {
 #define AV_PARSER_PTS_NB 4
     int cur_frame_start_index;
     int64_t cur_frame_offset[AV_PARSER_PTS_NB];
+    int64_t cur_frame_end[AV_PARSER_PTS_NB];
     int64_t cur_frame_pts[AV_PARSER_PTS_NB];
     int64_t cur_frame_dts[AV_PARSER_PTS_NB];
 
@@ -2844,7 +2845,6 @@ typedef struct AVCodecParserContext {
 #define PARSER_FLAG_COMPLETE_FRAMES           0x0001
 
     int64_t offset;      ///< byte offset from starting packet start
-    int64_t last_offset;
 } AVCodecParserContext;
 
 typedef struct AVCodecParser {

libavcodec/dvbsub_parser.c

@@ -80,7 +80,7 @@ static int dvbsub_parse(AVCodecParserContext *s,
 
     s->fetch_timestamp = 1;
 
-    if (s->last_pts != s->pts && s->last_pts != AV_NOPTS_VALUE) /* Start of a new packet */
+    if (s->last_pts != s->pts && s->pts != AV_NOPTS_VALUE) /* Start of a new packet */
     {
         if (pc->packet_index != pc->packet_start)
         {
@@ -175,8 +175,8 @@ static int dvbsub_parse(AVCodecParserContext *s,
         pc->packet_start = *poutbuf_size;
     }
 
-    if (s->last_pts == AV_NOPTS_VALUE)
-        s->last_pts = s->pts;
+    if (s->pts == AV_NOPTS_VALUE)
+        s->pts = s->last_pts;
 
     return buf_size;
 }

libavcodec/parser.c

@@ -118,17 +118,25 @@ int av_parser_parse(AVCodecParserContext *s,
         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_end[k] = s->cur_offset + buf_size;
         s->cur_frame_pts[k] = pts;
         s->cur_frame_dts[k] = dts;
+    }
 
-        /* fill first PTS/DTS */
         if (s->fetch_timestamp){
             s->fetch_timestamp=0;
-            s->last_pts = pts;
-            s->last_dts = dts;
-            s->last_offset = 0;
-            s->cur_frame_pts[k] =
-            s->cur_frame_dts[k] = AV_NOPTS_VALUE;
+        s->last_pts = s->pts;
+        s->last_dts = s->dts;
+        s->dts= s->pts= AV_NOPTS_VALUE;
+        s->offset= 0;
+        for(i = 0; i < AV_PARSER_PTS_NB; i++) {
+            if (   s->last_frame_offset >= s->cur_frame_offset[i]
+                &&(s->     frame_offset <  s->cur_frame_offset[i] || !s->frame_offset)
+                && s->last_frame_offset <  s->cur_frame_end[i]){
+                s->dts= s->cur_frame_dts[i];
+                s->pts= s->cur_frame_pts[i];
+                s->offset = s->last_frame_offset - s->cur_frame_offset[i];
+            }
         }
     }
 
@@ -139,35 +147,11 @@ int av_parser_parse(AVCodecParserContext *s,
     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;
-        s->offset = s->last_offset;
 
         /* 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];
-        s->last_offset = s->last_frame_offset - s->cur_frame_offset[k];
-
-        /* some parsers tell us the packet size even before seeing the first byte of the next packet,
-           so the next pts/dts is in the next chunk */
-        if(index == buf_size){
             s->fetch_timestamp=1;
     }
-    }
     if (index < 0)
         index = 0;
     s->cur_offset += index;