@@ -13,6 +13,9 @@ libavutil:   2011-04-18

 API changes, most recent first:

+2012-xx-xx - xxxxxxx - lavc 54.x.x

+  Add duration field to AVCodecParserContext

+

 2012-02-xx - xxxxxxx - lavu 51.23.1 - mathematics.h

   Add av_rescale_q_rnd()

@@ -3994,6 +3994,13 @@ typedef struct AVCodecParserContext {

      * Previous frame byte position.

      */

     int64_t last_pos;

+

+    /**

+     * Duration of the current frame.

+     * For audio, this is in units of 1 / AVCodecContext.sample_rate.

+     * For all other types, this is in units of AVCodecContext.time_base.

+     */

+    int duration;

 } AVCodecParserContext;

 typedef struct AVCodecParser {

@@ -1039,6 +1039,20 @@ static int read_frame_internal(AVFormatContext *s, AVPacket *pkt)

                 if (pkt->size) {

                 got_packet:

                     pkt->duration = 0;

+                    if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

+                        if (st->codec->sample_rate > 0) {

+                            pkt->duration = av_rescale_q_rnd(st->parser->duration,

+                                                             (AVRational){ 1, st->codec->sample_rate },

+                                                             st->time_base,

+                                                             AV_ROUND_DOWN);

+                        }

+                    } else if (st->codec->time_base.num != 0 &&

+                               st->codec->time_base.den != 0) {

+                        pkt->duration = av_rescale_q_rnd(st->parser->duration,

+                                                         st->codec->time_base,

+                                                         st->time_base,

+                                                         AV_ROUND_DOWN);

+                    }

                     pkt->stream_index = st->index;

                     pkt->pts = st->parser->pts;

                     pkt->dts = st->parser->dts;