+ if (avctx->flags & AV_CODEC_FLAG_DROPCHANGED) {
+
+ if (avctx->frame_number == 1) {
+ avci->initial_format = frame->format;
+ switch(avctx->codec_type) {
+ case AVMEDIA_TYPE_VIDEO:
+ avci->initial_width = frame->width;
+ avci->initial_height = frame->height;
+ break;
+ case AVMEDIA_TYPE_AUDIO:
+ avci->initial_sample_rate = frame->sample_rate ? frame->sample_rate :
+ avctx->sample_rate;
+ avci->initial_channels = frame->channels;
+ avci->initial_channel_layout = frame->channel_layout;
+ break;
+ }
+ }
+
+ if (avctx->frame_number > 1) {
+ changed = avci->initial_format != frame->format;
+
+ switch(avctx->codec_type) {
+ case AVMEDIA_TYPE_VIDEO:
+ changed |= avci->initial_width != frame->width ||
+ avci->initial_height != frame->height;
+ break;
+ case AVMEDIA_TYPE_AUDIO:
+ changed |= avci->initial_sample_rate != frame->sample_rate ||
+ avci->initial_sample_rate != avctx->sample_rate ||
+ avci->initial_channels != frame->channels ||
+ avci->initial_channel_layout != frame->channel_layout;
+ break;
+ }
+
+ if (changed) {
+ avci->changed_frames_dropped++;
+ av_log(avctx, AV_LOG_INFO, "dropped changed frame #%d pts %"PRId64
+ " drop count: %d \n",
+ avctx->frame_number, frame->pts,
+ avci->changed_frames_dropped);
+ av_frame_unref(frame);
+ return AVERROR_INPUT_CHANGED;
+ }
+ }
+ }