avcodec: set skip_samples in generic code

Decoders should only worry about exporting AVCodeContext->delay during init.

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/avcodec.c

@@ -354,6 +354,8 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
         if (!avctx->bit_rate)
             avctx->bit_rate = get_bit_rate(avctx);
 
+        avci->skip_samples = avctx->delay;
+
         /* validate channel layout from the decoder */
         if ((avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) ||
             avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {

libavcodec/liblc3dec.c

@@ -87,7 +87,6 @@ static av_cold int liblc3_decode_init(AVCodecContext *avctx)
 
     avctx->delay = lc3_hr_delay_samples(
         liblc3->hr_mode, liblc3->frame_us, liblc3->srate_hz);
-    avctx->internal->skip_samples = avctx->delay;
 
     return 0;
 }

libavcodec/libopusdec.c

@@ -139,7 +139,7 @@ static av_cold int libopus_decode_init(AVCodecContext *avc)
 #endif
 
     /* Decoder delay (in samples) at 48kHz */
-    avc->delay = avc->internal->skip_samples = opus->pre_skip;
+    avc->delay = opus->pre_skip;
 
     return 0;
 }

libavcodec/opus/parse.c

@@ -321,8 +321,6 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
     }
 
     avctx->delay = AV_RL16(extradata + 10);
-    if (avctx->internal)
-        avctx->internal->skip_samples = avctx->delay;
 
     channels = avctx->extradata ? extradata[9] : (channels == 1) ? 1 : 2;
     if (!channels) {

libavcodec/wmadec.c

@@ -140,7 +140,7 @@ static av_cold int wma_decode_init(AVCodecContext *avctx)
 
     avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
 
-    avctx->internal->skip_samples = s->frame_len * 2;
+    avctx->delay = s->frame_len * 2;
 
     return 0;
 }