lavc/encode: add an encoder-specific get_buffer() variant

Several encoders (roqvideo, svq1, snow, and the mpegvideo family)
currently call ff_get_buffer(). However this function is written
assuming it is called by a decoder. Though nothing has been obviously
broken by this until now, that may change in the future.

To avoid potential future issues, introduce a simple encode-specific
wrapper around avcodec_default_get_buffer2() and enforce its use in
encoders.

1 files changed, 2 insertions, 2 deletions

diff --git a/libavcodec/svq1enc.c b/libavcodec/svq1enc.c
index 3d9452c543..b4e61e4517 100644
--- a/libavcodec/svq1enc.c
+++ b/libavcodec/svq1enc.c
@@ -595,12 +595,12 @@ static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     }
 
     if (!s->current_picture->data[0]) {
-        if ((ret = ff_get_buffer(avctx, s->current_picture, 0)) < 0) {
+        if ((ret = ff_encode_alloc_frame(avctx, s->current_picture)) < 0) {
             return ret;
         }
     }
     if (!s->last_picture->data[0]) {
-        ret = ff_get_buffer(avctx, s->last_picture, 0);
+        ret = ff_encode_alloc_frame(avctx, s->last_picture);
         if (ret < 0)
             return ret;
     }