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fix(media-proxy): stop lifting bt709 video thumbnails (#2443)

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Hampus authored and GitHub committed 2026-09-04 13:17:30 +02:00
1 parent baa18aed5b
commit 098aeef412
2 files changed
+38 -10
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fluxer_media_proxy/src/native_shim/av_frame_rgba.c
+2 -10
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@@ -4,11 +4,9 @@
enum ff_sdr_transfer {
FF_SDR_TRANSFER_SRGB = 0,
FF_SDR_TRANSFER_BT709 = 1,
FF_SDR_TRANSFER_LINEAR = 2,
FF_SDR_TRANSFER_LINEAR = 1,
};
static uint8_t ff_bt709_to_srgb_lut[256];
static uint8_t ff_linear_to_srgb_lut[256];
static pthread_once_t ff_transfer_lut_once = PTHREAD_ONCE_INIT;
@@ -25,18 +23,12 @@ static uint8_t ff_encode_srgb_byte(double linear) {
static void ff_initialize_transfer_luts(void) {
for (int index = 0; index < 256; index++) {
double encoded = (double)index / 255.0;
double linear = encoded < 0.081
? encoded / 4.5
: pow((encoded + 0.099) / 1.099, 1.0 / 0.45);
ff_bt709_to_srgb_lut[index] = ff_encode_srgb_byte(linear);
ff_linear_to_srgb_lut[index] = ff_encode_srgb_byte(encoded);
}
}
static const uint8_t *ff_transfer_to_srgb_lut(enum ff_sdr_transfer transfer) {
switch (transfer) {
case FF_SDR_TRANSFER_BT709:
return ff_bt709_to_srgb_lut;
case FF_SDR_TRANSFER_LINEAR:
return ff_linear_to_srgb_lut;
default:
@@ -89,7 +81,7 @@ static int ff_frame_sdr_transfer(
case AVCOL_TRC_BT709:
case AVCOL_TRC_SMPTE170M:
case AVCOL_TRC_SMPTE240M:
*out_transfer = FF_SDR_TRANSFER_BT709;
*out_transfer = FF_SDR_TRANSFER_SRGB;
return 0;
case AVCOL_TRC_LINEAR:
*out_transfer = FF_SDR_TRANSFER_LINEAR;