From: Niklas Haas <g...@haasn.dev>
Error out if trying to encode frames with an incompatible alpha mode.
---
libavcodec/encode.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/libavcodec/encode.c b/libavcodec/encode.c
index cd10dcf3cd..4e05932e9f 100644
--- a/libavcodec/encode.c
+++ b/libavcodec/encode.c
@@ -602,6 +602,33 @@ static int encode_preinit_video(AVCodecContext *avctx)
avctx->color_range = AVCOL_RANGE_JPEG;
}
+ if (pixdesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
+ const enum AVAlphaMode *alpha_modes;
+ int num_alpha_modes;
+ ret = avcodec_get_supported_config(avctx, NULL,
AV_CODEC_CONFIG_ALPHA_MODE,
+ 0, (const void **) &alpha_modes,
&num_alpha_modes);
+ if (ret < 0)
+ return ret;
+
+ if (avctx->alpha_mode != AVALPHA_MODE_UNSPECIFIED && alpha_modes) {
+ for (i = 0; i < num_alpha_modes; i++) {
+ if (avctx->alpha_mode == alpha_modes[i])
+ break;
+ }
+ if (i == num_alpha_modes) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Specified alpha mode '%s' is not supported by the %s
encoder.\n",
+ av_alpha_mode_name(avctx->alpha_mode), c->name);
+ av_log(avctx, AV_LOG_ERROR, "Supported alpha modes:\n");
+ for (int p = 0; alpha_modes[p] != AVALPHA_MODE_UNSPECIFIED;
p++) {
+ av_log(avctx, AV_LOG_ERROR, " %s\n",
+ av_alpha_mode_name(alpha_modes[p]));
+ }
+ return AVERROR(EINVAL);
+ }
+ }
+ }
+
if ( avctx->bits_per_raw_sample < 0
|| (avctx->bits_per_raw_sample > 8 && pixdesc->comp[0].depth <= 8)) {
av_log(avctx, AV_LOG_WARNING, "Specified bit depth %d not possible
with the specified pixel formats depth %d\n",
--
2.47.0
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