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Do not assume the used size is the same of the allocated size, as it was
wrongly assumed. Fix audio playback when the two values differ.

Stefano Sabatini authored on 2011/10/16 17:35:07
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@@ -299,7 +299,9 @@ static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
                              avpicture_layout(&pict, ref->format, ref->video->w,
                                               ref->video->h, pkt->data, size);
                          } else if (ref->audio) {
                     -        size = ref->linesize[0];
                     +        size = ref->audio->nb_samples *
                     +            av_get_bytes_per_sample(ref->format) *
                     +            av_get_channel_layout_nb_channels(ref->audio->channel_layout);
                              if ((ret = av_new_packet(pkt, size)) < 0)
                                  return ret;
                              memcpy(pkt->data, ref->data[0], size);