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webp: Fix alpha decoding

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This was broken by 4e528206bc - the webp
decoder was assuming that it could set the output pixfmt of the vp8
decoder directly, but after that change it no longer could because
ff_get_format() was used instead.  This adds an internal get_format()
callback to webp use of the vp8 decoder to override the pixfmt
appropriately.
This commit is contained in:
Mark Thompson 2017-02-17 23:14:19 +00:00
parent 2d518aec4c
commit 7cb9296db8
1 changed files with 11 additions and 2 deletions
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13
libavcodec/webp.c
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@ -1288,6 +1288,16 @@ static int vp8_lossy_decode_alpha(AVCodecContext *avctx, AVFrame *p,
return 0;
}
static enum AVPixelFormat webp_get_format(AVCodecContext *avctx,
const enum AVPixelFormat *formats)
{
WebPContext *s = avctx->priv_data;
if (s->has_alpha)
return AV_PIX_FMT_YUVA420P;
else
return AV_PIX_FMT_YUV420P;
}
static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, uint8_t *data_start,
unsigned int data_size)
@ -1299,8 +1309,7 @@ static int vp8_lossy_decode_frame(AVCodecContext *avctx, AVFrame *p,
if (!s->initialized) {
ff_vp8_decode_init(avctx);
s->initialized = 1;
if (s->has_alpha)
avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
avctx->get_format = webp_get_format;
}
s->lossless = 0;