[FFmpeg-devel] [PATCH] avcodec/ffv1: Only allocate ThreadFrames for the decoder

[Andreas Rheinhardt]

The FFV1 decoder only uses the last frame's data to conceal
errors. The encoder does not have this problem and therefore
only uses the current frame and none of the ThreadFrames.
So only allocate them for the decoder.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
---
 libavcodec/ffv1.c    | 13 -------------
 libavcodec/ffv1dec.c | 23 ++++++++++++++++++++++-
 2 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/libavcodec/ffv1.c b/libavcodec/ffv1.c
index c8781cdaaa..b6204740ed 100644
--- a/libavcodec/ffv1.c
+++ b/libavcodec/ffv1.c
@@ -43,11 +43,6 @@ av_cold int ff_ffv1_common_init(AVCodecContext *avctx)
     s->avctx = avctx;
     s->flags = avctx->flags;
 
-    s->picture.f = av_frame_alloc();
-    s->last_picture.f = av_frame_alloc();
-    if (!s->picture.f || !s->last_picture.f)
-        return AVERROR(ENOMEM);
-
     s->width  = avctx->width;
     s->height = avctx->height;
 
@@ -198,14 +193,6 @@ av_cold int ff_ffv1_close(AVCodecContext *avctx)
     FFV1Context *s = avctx->priv_data;
     int i, j;
 
-    if (s->picture.f)
-        ff_thread_release_ext_buffer(avctx, &s->picture);
-    av_frame_free(&s->picture.f);
-
-    if (s->last_picture.f)
-        ff_thread_release_ext_buffer(avctx, &s->last_picture);
-    av_frame_free(&s->last_picture.f);
-
     for (j = 0; j < s->max_slice_count; j++) {
         FFV1Context *fs = s->slice_context[j];
         for (i = 0; i < s->plane_count; i++) {
diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index 794c58cc40..d4bc60a7da 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -823,6 +823,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
     if ((ret = ff_ffv1_common_init(avctx)) < 0)
         return ret;
 
+    f->picture.f      = av_frame_alloc();
+    f->last_picture.f = av_frame_alloc();
+    if (!f->picture.f || !f->last_picture.f)
+        return AVERROR(ENOMEM);
+
     if (avctx->extradata_size > 0 && (ret = read_extra_header(f)) < 0)
         return ret;
 
@@ -1068,6 +1073,22 @@ static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
 }
 #endif
 
+static av_cold int ffv1_decode_close(AVCodecContext *avctx)
+{
+    FFV1Context *const s = avctx->priv_data;
+
+    if (s->picture.f) {
+        ff_thread_release_ext_buffer(avctx, &s->picture);
+        av_frame_free(&s->picture.f);
+    }
+
+    if (s->last_picture.f) {
+        ff_thread_release_ext_buffer(avctx, &s->last_picture);
+        av_frame_free(&s->last_picture.f);
+    }
+    return ff_ffv1_close(avctx);
+}
+
 const FFCodec ff_ffv1_decoder = {
     .p.name         = "ffv1",
     CODEC_LONG_NAME("FFmpeg video codec #1"),
@@ -1075,7 +1096,7 @@ const FFCodec ff_ffv1_decoder = {
     .p.id           = AV_CODEC_ID_FFV1,
     .priv_data_size = sizeof(FFV1Context),
     .init           = decode_init,
-    .close          = ff_ffv1_close,
+    .close          = ffv1_decode_close,
     FF_CODEC_DECODE_CB(decode_frame),
     UPDATE_THREAD_CONTEXT(update_thread_context),
     .p.capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/ |
-- 
2.34.1