return c;
}
+static uint16_t * alloc_gamma_tbl(double e)
+{
+ int i = 0;
+ uint16_t * tbl;
+ tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);
+ if (!tbl)
+ return NULL;
+
+ for (i = 0; i < 65536; ++i) {
+ tbl[i] = pow(i / 65535.0, e) * 65535.0;
+ }
+ return tbl;
+}
+
av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
SwsFilter *dstFilter)
{
const AVPixFmtDescriptor *desc_src;
const AVPixFmtDescriptor *desc_dst;
int ret = 0;
+ enum AVPixelFormat tmpFmt;
cpu_flags = av_get_cpu_flags();
flags = c->flags;
}
}
+ // hardcoded for now
+ c->gamma_value = 2.2;
+ tmpFmt = AV_PIX_FMT_RGBA64LE;
+
+
+ if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {
+ SwsContext *c2;
+ c->cascaded_context[0] = NULL;
+
+ ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,
+ srcW, srcH, tmpFmt, 64);
+ if (ret < 0)
+ return ret;
+
+ c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,
+ srcW, srcH, tmpFmt,
+ flags, NULL, NULL, c->param);
+ if (!c->cascaded_context[0]) {
+ return -1;
+ }
+
+ c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,
+ dstW, dstH, tmpFmt,
+ flags, srcFilter, dstFilter, c->param);
+
+ if (!c->cascaded_context[1])
+ return -1;
+
+ c2 = c->cascaded_context[1];
+ c2->is_internal_gamma = 1;
+ c2->gamma = alloc_gamma_tbl( c->gamma_value);
+ c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);
+ if (!c2->gamma || !c2->inv_gamma)
+ return AVERROR(ENOMEM);
+
+ c->cascaded_context[2] = NULL;
+ if (dstFormat != tmpFmt) {
+ ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,
+ dstW, dstH, tmpFmt, 64);
+ if (ret < 0)
+ return ret;
+
+ c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,
+ dstW, dstH, dstFormat,
+ flags, NULL, NULL, c->param);
+ if (!c->cascaded_context[2])
+ return -1;
+ }
+ return 0;
+ }
+
if (isBayer(srcFormat)) {
if (!unscaled ||
(dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {
sws_freeContext(c->cascaded_context[0]);
sws_freeContext(c->cascaded_context[1]);
+ sws_freeContext(c->cascaded_context[2]);
memset(c->cascaded_context, 0, sizeof(c->cascaded_context));
av_freep(&c->cascaded_tmp[0]);
+ av_freep(&c->cascaded1_tmp[0]);
+
+ av_freep(&c->gamma);
+ av_freep(&c->inv_gamma);
+
av_free(c);
}