lavc: use a separate field for exporting audio encoder padding

Currently, the amount of padding inserted at the beginning by some audio
encoders, is exported through AVCodecContext.delay. However
- the term 'delay' is heavily overloaded and can have multiple different
  meanings even in the case of audio encoding.
- this field has entirely different meanings, depending on whether the
  codec context is used for encoding or decoding (and has yet another
  different meaning for video), preventing generic handling of the codec
  context.

Therefore, add a new field -- AVCodecContext.initial_padding. It could
conceivably be used for decoding as well at a later point.

1 files changed, 2 insertions, 2 deletions

diff --git a/libavcodec/libvorbis.c b/libavcodec/libvorbis.c
index 4b4caaac17..07973e6379 100644
--- a/libavcodec/libvorbis.c
+++ b/libavcodec/libvorbis.c
@@ -322,8 +322,8 @@ static int libvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
     if (duration > 0) {
         /* we do not know encoder delay until we get the first packet from
          * libvorbis, so we have to update the AudioFrameQueue counts */
-        if (!avctx->delay) {
-            avctx->delay              = duration;
+        if (!avctx->initial_padding) {
+            avctx->initial_padding    = duration;
             s->afq.remaining_delay   += duration;
             s->afq.remaining_samples += duration;
         }