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avcodec/bmp: Analyze BGRA files alpha channel to choose pixel format

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BGRA BMPs commonly do contain an all transparent alpha channel

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-10 16:06:14 +02:00
parent 319898bba2
commit aec340c533
1 changed files with 14 additions and 0 deletions
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14
libavcodec/bmp.c
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@ -337,6 +337,20 @@ static int bmp_decode_frame(AVCodecContext *avctx,
return AVERROR_INVALIDDATA;
}
}
if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
for (i = 0; i < avctx->height; i++) {
int j;
uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3;
for (j = 0; j < avctx->width; j++) {
if (ptr[4*j])
break;
}
if (j < avctx->width)
break;
}
if (i == avctx->height)
avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0;
}
*got_frame = 1;