Add an AVSTREAM_PARSE_FULL_ONCE parsing mode to parse headers and combine packets once and only once.

Originally committed as revision 23332 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/avcodec.h

@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 69
+#define LIBAVCODEC_VERSION_MINOR 70
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@@ -3649,6 +3649,7 @@ typedef struct AVCodecParserContext {
 
     int flags;
 #define PARSER_FLAG_COMPLETE_FRAMES           0x0001
+#define PARSER_FLAG_ONCE                      0x0002
 
     int64_t offset;      ///< byte offset from starting packet start
     int64_t cur_frame_end[AV_PARSER_PTS_NB];

libavcodec/h264_parser.c

@@ -272,6 +272,9 @@ static int h264_parse(AVCodecParserContext *s,
             s->dts_ref_dts_delta = INT_MIN;
             s->pts_dts_delta     = INT_MIN;
         }
+        if (s->flags & PARSER_FLAG_ONCE) {
+            s->flags &= PARSER_FLAG_COMPLETE_FRAMES;
+        }
     }
 
     *poutbuf = buf;

libavformat/avformat.h

@@ -22,7 +22,7 @@
 #define AVFORMAT_AVFORMAT_H
 
 #define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 65
+#define LIBAVFORMAT_VERSION_MINOR 66
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
@@ -377,6 +377,7 @@ enum AVStreamParseType {
     AVSTREAM_PARSE_FULL,       /**< full parsing and repack */
     AVSTREAM_PARSE_HEADERS,    /**< Only parse headers, do not repack. */
     AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
+    AVSTREAM_PARSE_FULL_ONCE,  /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
 };
 
 typedef struct AVIndexEntry {

libavformat/utils.c

@@ -1117,6 +1117,8 @@ static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt)
                     st->need_parsing = AVSTREAM_PARSE_NONE;
                 }else if(st->need_parsing == AVSTREAM_PARSE_HEADERS){
                     st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
+                }else if(st->need_parsing == AVSTREAM_PARSE_FULL_ONCE){
+                    st->parser->flags |= PARSER_FLAG_ONCE;
                 }
                 if(st->parser && (s->iformat->flags & AVFMT_GENERIC_INDEX)){
                     st->parser->next_frame_offset=