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swscale/utils: Split scaling if possible and yuv->yuv with different matrixes is requested

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This uses a RGB intermediate, a more optimal solution would be to perform the rematrixing
directly in subsampled YUV, this is quite a bit more complicated though

Fixes Ticket4805

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-08-30 23:58:37 +02:00
parent 58a0b7f114
commit 8e05f9217a
1 changed files with 66 additions and 1 deletions
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67
libswscale/utils.c
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@ -855,8 +855,73 @@ int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
if (need_reinit && (c->srcBpc == 8 || !isYUV(c->srcFormat)))
ff_sws_init_range_convert(c);
if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat)))
if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat))) {
if (!c->cascaded_context[0] &&
memcmp(c->dstColorspaceTable, c->srcColorspaceTable, sizeof(int) * 4) &&
c->srcW && c->srcH && c->dstW && c->dstH) {
enum AVPixelFormat tmp_format;
int tmp_width, tmp_height;
int srcW = c->srcW;
int srcH = c->srcH;
int dstW = c->dstW;
int dstH = c->dstH;
int ret;
av_log(c, AV_LOG_VERBOSE, "YUV color matrix differs for YUV->YUV, using intermediate RGB to convert\n");
if (isNBPS(c->dstFormat) || is16BPS(c->dstFormat)) {
if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
tmp_format = AV_PIX_FMT_BGRA64;
} else {
tmp_format = AV_PIX_FMT_BGR48;
}
} else {
if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {
tmp_format = AV_PIX_FMT_BGRA;
} else {
tmp_format = AV_PIX_FMT_BGR24;
}
}
if (srcW*srcH > dstW*dstH) {
tmp_width = dstW;
tmp_height = dstH;
} else {
tmp_width = srcW;
tmp_height = srcH;
}
ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
tmp_width, tmp_height, tmp_format, 64);
if (ret < 0)
return ret;
c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, c->srcFormat,
tmp_width, tmp_height, tmp_format,
c->flags, c->param);
if (!c->cascaded_context[0])
return -1;
c->cascaded_context[0]->alphablend = c->alphablend;
ret = sws_init_context(c->cascaded_context[0], NULL , NULL);
if (ret < 0)
return ret;
//we set both src and dst depending on that the RGB side will be ignored
sws_setColorspaceDetails(c->cascaded_context[0], inv_table,
srcRange, table, dstRange,
brightness, contrast, saturation);
c->cascaded_context[1] = sws_getContext(tmp_width, tmp_height, tmp_format,
dstW, dstH, c->dstFormat,
c->flags, NULL, NULL, c->param);
if (!c->cascaded_context[1])
return -1;
sws_setColorspaceDetails(c->cascaded_context[1], inv_table,
srcRange, table, dstRange,
0, 1 << 16, 1 << 16);
return 0;
}
return -1;
}
c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
c->srcFormatBpp = av_get_bits_per_pixel(desc_src);