ffmpeg: use av_rescale_delta() on the audio filter input

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

ffmpeg.c

@@ -1525,8 +1525,8 @@ static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output)
         decoded_frame_tb   = AV_TIME_BASE_Q;
     }
     if (decoded_frame->pts != AV_NOPTS_VALUE)
-        decoded_frame->pts = av_rescale_q(decoded_frame->pts,
-                                          decoded_frame_tb,
+        decoded_frame->pts = av_rescale_delta(decoded_frame_tb, decoded_frame->pts,
+                                              (AVRational){1, ist->st->codec->sample_rate}, decoded_frame->nb_samples, &ist->filter_in_rescale_delta_last,
                                               (AVRational){1, ist->st->codec->sample_rate});
     for (i = 0; i < ist->nb_filters; i++)
         av_buffersrc_add_frame(ist->filters[i]->filter, decoded_frame,

ffmpeg.h

@@ -217,6 +217,9 @@ typedef struct InputStream {
     int64_t       next_pts;  ///< synthetic pts for the next decode frame (in AV_TIME_BASE units)
     int64_t       pts;       ///< current pts of the decoded frame  (in AV_TIME_BASE units)
     int           wrap_correction_done;
+
+    int64_t filter_in_rescale_delta_last;
+
     double ts_scale;
     int is_start;            /* is 1 at the start and after a discontinuity */
     int saw_first_ts;

ffmpeg_opt.c

@@ -586,6 +586,8 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
         ist->reinit_filters = -1;
         MATCH_PER_STREAM_OPT(reinit_filters, i, ist->reinit_filters, ic, st);
 
+        ist->filter_in_rescale_delta_last = AV_NOPTS_VALUE;
+
         switch (dec->codec_type) {
         case AVMEDIA_TYPE_VIDEO:
             if(!ist->dec)

tests/ref/lavf/mxf

@@ -3,7 +3,7 @@ c53c9f7ee2091405fbe50374f9055679 *./tests/data/lavf/lavf.mxf
 ./tests/data/lavf/lavf.mxf CRC=0x17ce1069
 14d0ac1513840b670a785daf4331aca8 *./tests/data/lavf/lavf.mxf
 554553 ./tests/data/lavf/lavf.mxf
-./tests/data/lavf/lavf.mxf CRC=0xa3c0dbc4
+./tests/data/lavf/lavf.mxf CRC=0xe11bdbc4
 5636cee18b0f34a5acb33a8efb9f80c6 *./tests/data/lavf/lavf.mxf
 525369 ./tests/data/lavf/lavf.mxf
 ./tests/data/lavf/lavf.mxf CRC=0x17ce1069