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yuv2rgb: Document the color space coefficients
Based on the original documentation found in mpeg2dec (1995). Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
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#include "swscale.h"
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#include "swscale_internal.h"
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/* Color space conversion coefficients for YCbCr -> RGB mapping.
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*
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* Entries are {crv, cbu, cgu, cgv}
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*
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* crv = (255 / 224) * 65536 * (1 - cr) / 0.5
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* cbu = (255 / 224) * 65536 * (1 - cb) / 0.5
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* cgu = (255 / 224) * 65536 * (cb / cg) * (1 - cb) / 0.5
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* cgv = (255 / 224) * 65536 * (cr / cg) * (1 - cr) / 0.5
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*
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* where Y = cr * R + cg * G + cb * B and cr + cg + cb = 1.
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*/
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const int32_t ff_yuv2rgb_coeffs[8][4] = {
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{ 117504, 138453, 13954, 34903 }, /* no sequence_display_extension */
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{ 117504, 138453, 13954, 34903 }, /* ITU-R Rec. 709 (1990) */
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