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avcodec/proresenc_anatoliy: do not write into alpha reserved bitfields

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This byte represents 4 reserved bits followed by 4 alpha_channel_type bits.

alpha_channel_type currently has 3 differents defined values: 0 (no
alpha), 1 (8b alpha), and 2 (16b alpha), all the other values are
reserved. The 4 initial reserved bits are expected to be 0.
This commit is contained in:
Clément Bœsch 2023-12-11 19:51:48 +01:00
parent 6d35911667
commit 21f7a814ea
17 changed files with 17 additions and 25 deletions
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10
libavcodec/proresenc_anatoliy.c
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@ -775,15 +775,7 @@ static int prores_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
pict->color_trc, valid_trc, 0);
*buf++ = int_from_list_or_default(avctx, "frame colorspace",
pict->colorspace, valid_colorspace, 0);
if (avctx->profile >= AV_PROFILE_PRORES_4444) {
if (avctx->pix_fmt == AV_PIX_FMT_YUV444P10) {
*buf++ = 0xA0;/* src b64a and no alpha */
} else {
*buf++ = 0xA2;/* src b64a and 16b alpha */
}
} else {
*buf++ = 32;/* src v210 and no alpha */
}
*buf++ = ctx->need_alpha ? 0x2 /* 16-bit alpha */ : 0;
*buf++ = 0; /* reserved */
*buf++ = 3; /* luma and chroma matrix present */