avcodec: add AVCodecContext.sw_pix_fmt

This carries the pixel format that would be used if it were not for
hardware acceleration. This is equal to AVCodecContext.pix_fmt if
hardware acceleration is not in use.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 11 insertions, 4 deletions

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 8cbd47b84d..fcc7dde789 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -665,10 +665,13 @@ int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
     if (ret < 0)
         return ret;
 
-    if (hwaccel && hwaccel->alloc_frame) {
-        ret = hwaccel->alloc_frame(avctx, frame);
-        goto end;
-    }
+    if (hwaccel) {
+        if (hwaccel->alloc_frame) {
+            ret = hwaccel->alloc_frame(avctx, frame);
+            goto end;
+        }
+    } else
+        avctx->sw_pix_fmt = avctx->pix_fmt;
 
 #if FF_API_GET_BUFFER
 FF_DISABLE_DEPRECATION_WARNINGS
@@ -933,6 +936,10 @@ int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
     while (fmt[n] != AV_PIX_FMT_NONE)
         ++n;
 
+    av_assert0(n >= 1);
+    avctx->sw_pix_fmt = fmt[n - 1];
+    av_assert2(!is_hwaccel_pix_fmt(avctx->sw_pix_fmt));
+
     choices = av_malloc_array(n + 1, sizeof(*choices));
     if (!choices)
         return AV_PIX_FMT_NONE;