git.sesse.net Git - nageru/blob - futatabi/ycbcr_converter.cpp

   1 #include "ycbcr_converter.h"
   2
   3 #include "exif_parser.h"
   4 #include "flags.h"
   5 #include "jpeg_frame.h"
   6
   7 #include <array>
   8 #include <movit/mix_effect.h>
   9 #include <movit/white_balance_effect.h>
  10 #include <movit/ycbcr_input.h>
  11
  12 using namespace movit;
  13 using namespace std;
  14
  15 namespace {
  16
  17 void setup_outputs(YCbCrConverter::OutputMode output_mode, const ImageFormat &output_format, const YCbCrFormat &ycbcr_output_format, EffectChain *chain)
  18 {
  19         if (output_mode == YCbCrConverter::OUTPUT_TO_RGBA) {
  20                 chain->add_output(output_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
  21                 chain->set_output_origin(OUTPUT_ORIGIN_BOTTOM_LEFT);
  22         } else if (output_mode == YCbCrConverter::OUTPUT_TO_SEMIPLANAR) {
  23                 chain->add_ycbcr_output(output_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, ycbcr_output_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR);
  24                 chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
  25         } else {
  26                 assert(output_mode == YCbCrConverter::OUTPUT_TO_DUAL_YCBCR);
  27
  28                 // One full Y'CbCr texture (for interpolation), one that's just Y (throwing away the
  29                 // Cb and Cr channels). The second copy is sort of redundant, but it's the easiest way
  30                 // of getting the gray data into a layered texture.
  31                 chain->add_ycbcr_output(output_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, ycbcr_output_format);
  32                 chain->add_ycbcr_output(output_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, ycbcr_output_format);
  33                 chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
  34         }
  35 }
  36
  37 }  // namespace
  38
  39 YCbCrConverter::YCbCrConverter(YCbCrConverter::OutputMode output_mode, ResourcePool *resource_pool)
  40 {
  41         ImageFormat inout_format;
  42         inout_format.color_space = COLORSPACE_sRGB;
  43         inout_format.gamma_curve = GAMMA_sRGB;
  44
  45         ycbcr_format.luma_coefficients = YCBCR_REC_709;
  46         ycbcr_format.num_levels = 256;
  47         ycbcr_format.chroma_subsampling_x = 2;
  48         ycbcr_format.chroma_subsampling_y = 1;
  49         ycbcr_format.cb_x_position = 0.0f;  // H.264 -- _not_ JPEG, even though our input is MJPEG-encoded
  50         ycbcr_format.cb_y_position = 0.5f;  // Irrelevant.
  51         ycbcr_format.cr_x_position = 0.0f;
  52         ycbcr_format.cr_y_position = 0.5f;
  53
  54         // This is a hack. Even though we're sending MJPEG around, which is
  55         // full-range, it's mostly transporting signals from limited-range
  56         // sources with no conversion, so we ought to have had false here.
  57         // However, in the off chance that we're actually getting real MJPEG,
  58         // we don't want to crush its blacks (or whites) by clamping. All of
  59         // our processing is fades or other linear operations, so if we're in
  60         // limited-range input, we'll stay in limited-range output. (Fading
  61         // between limited-range and full-range sources will be broken,
  62         // of course.) There will be some slight confusion in the parts of the
  63         // algorithms dealing with RGB, but they're small and we'll manage.
  64         ycbcr_format.full_range = false;
  65
  66         YCbCrFormat ycbcr_output_format = ycbcr_format;
  67         ycbcr_output_format.chroma_subsampling_x = 1;
  68
  69         // Planar Y'CbCr decoding chain.
  70         planar_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool));
  71         ycbcr_planar_input = (YCbCrInput *)planar_chain->add_input(new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_PLANAR));
  72         setup_outputs(output_mode, inout_format, ycbcr_output_format, planar_chain.get());
  73         planar_chain->set_dither_bits(8);
  74         planar_chain->finalize();
  75
  76         // Semiplanar Y'CbCr decoding chain (for images coming from VA-API).
  77         semiplanar_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool));
  78         ycbcr_semiplanar_input = (YCbCrInput *)semiplanar_chain->add_input(new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR));
  79         setup_outputs(output_mode, inout_format, ycbcr_output_format, semiplanar_chain.get());
  80         semiplanar_chain->set_dither_bits(8);
  81         semiplanar_chain->finalize();
  82
  83         // Fade chains. These include white balance adjustments.
  84         for (bool first_input_is_semiplanar : { false, true }) {
  85                 for (bool second_input_is_semiplanar : { false, true }) {
  86                         FadeChain &fade_chain = fade_chains[first_input_is_semiplanar][second_input_is_semiplanar];
  87                         fade_chain.chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool));
  88                         fade_chain.input[0] = (YCbCrInput *)fade_chain.chain->add_input(
  89                                 new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height,
  90                                                first_input_is_semiplanar ? YCBCR_INPUT_SPLIT_Y_AND_CBCR : YCBCR_INPUT_PLANAR));
  91                         fade_chain.input[1] = (YCbCrInput *)fade_chain.chain->add_input(
  92                                 new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height,
  93                                                second_input_is_semiplanar ? YCBCR_INPUT_SPLIT_Y_AND_CBCR : YCBCR_INPUT_PLANAR));
  94                         fade_chain.wb_effect[0] = (WhiteBalanceEffect *)fade_chain.chain->add_effect(
  95                                 new WhiteBalanceEffect, fade_chain.input[0]);
  96                         fade_chain.wb_effect[1] = (WhiteBalanceEffect *)fade_chain.chain->add_effect(
  97                                 new WhiteBalanceEffect, fade_chain.input[1]);
  98                         fade_chain.mix_effect = (MixEffect *)fade_chain.chain->add_effect(
  99                                 new MixEffect, fade_chain.wb_effect[0], fade_chain.wb_effect[1]);
 100                         setup_outputs(output_mode, inout_format, ycbcr_output_format, fade_chain.chain.get());
 101                         fade_chain.chain->set_dither_bits(8);
 102                         fade_chain.chain->finalize();
 103                 }
 104         }
 105
 106         // Fade from interleaved chain (ie., first input is interleaved, since it comes
 107         // directly from the GPU anyway).
 108         for (bool second_input_is_semiplanar : { false, true }) {
 109                 FadeChain &fade_chain = interleaved_fade_chains[second_input_is_semiplanar];
 110                 fade_chain.chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool));
 111
 112                 ycbcr_format.chroma_subsampling_x = 1;
 113                 fade_chain.input[0] = (YCbCrInput *)fade_chain.chain->add_input(
 114                         new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height,
 115                                        YCBCR_INPUT_INTERLEAVED));
 116
 117                 ycbcr_format.chroma_subsampling_x = 2;
 118                 fade_chain.input[1] = (YCbCrInput *)fade_chain.chain->add_input(
 119                         new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height,
 120                                        second_input_is_semiplanar ? YCBCR_INPUT_SPLIT_Y_AND_CBCR : YCBCR_INPUT_PLANAR));
 121
 122                 fade_chain.wb_effect[0] = (WhiteBalanceEffect *)fade_chain.chain->add_effect(
 123                         new WhiteBalanceEffect, fade_chain.input[0]);
 124                 fade_chain.wb_effect[1] = (WhiteBalanceEffect *)fade_chain.chain->add_effect(
 125                         new WhiteBalanceEffect, fade_chain.input[1]);
 126                 fade_chain.mix_effect = (MixEffect *)fade_chain.chain->add_effect(
 127                         new MixEffect, fade_chain.wb_effect[0], fade_chain.wb_effect[1]);
 128                 setup_outputs(output_mode, inout_format, ycbcr_output_format, fade_chain.chain.get());
 129                 fade_chain.chain->set_dither_bits(8);
 130                 fade_chain.chain->finalize();
 131         }
 132 }
 133
 134 EffectChain *YCbCrConverter::prepare_chain_for_conversion(shared_ptr<Frame> frame)
 135 {
 136         if (frame->is_semiplanar) {
 137                 setup_input_for_frame(frame, ycbcr_format, ycbcr_semiplanar_input);
 138                 return semiplanar_chain.get();
 139         } else {
 140                 setup_input_for_frame(frame, ycbcr_format, ycbcr_planar_input);
 141                 return planar_chain.get();
 142         }
 143 }
 144
 145 EffectChain *YCbCrConverter::prepare_chain_for_fade(shared_ptr<Frame> frame, shared_ptr<Frame> secondary_frame, float fade_alpha)
 146 {
 147         const FadeChain &fade_chain = fade_chains[frame->is_semiplanar][secondary_frame->is_semiplanar];
 148         setup_input_for_frame(frame, ycbcr_format, fade_chain.input[0]);
 149         setup_input_for_frame(secondary_frame, ycbcr_format, fade_chain.input[1]);
 150         bool ok = fade_chain.mix_effect->set_float("strength_first", 1.0f - fade_alpha);
 151         ok |= fade_chain.mix_effect->set_float("strength_second", fade_alpha);
 152         RGBTriplet neutral_color0 = get_neutral_color(frame->exif_data);
 153         RGBTriplet neutral_color1 = get_neutral_color(secondary_frame->exif_data);
 154         ok |= fade_chain.wb_effect[0]->set_vec3("neutral_color", (float *)&neutral_color0);
 155         ok |= fade_chain.wb_effect[1]->set_vec3("neutral_color", (float *)&neutral_color1);
 156         assert(ok);
 157         return fade_chain.chain.get();
 158 }
 159
 160 EffectChain *YCbCrConverter::prepare_chain_for_fade_from_texture(GLuint tex, RGBTriplet tex_neutral_color, unsigned width, unsigned height, std::shared_ptr<Frame> secondary_frame, float fade_alpha)
 161 {
 162         const FadeChain &fade_chain = interleaved_fade_chains[secondary_frame->is_semiplanar];
 163         {
 164                 YCbCrFormat format_copy = ycbcr_format;
 165                 format_copy.chroma_subsampling_x = 1;
 166                 format_copy.chroma_subsampling_y = 1;
 167                 fade_chain.input[0]->change_ycbcr_format(format_copy);
 168
 169                 fade_chain.input[0]->set_width(width);  // Doesn't really matter.
 170                 fade_chain.input[0]->set_height(height);
 171                 fade_chain.input[0]->set_texture_num(0, tex);
 172
 173                 glTextureParameteri(tex, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 174                 glTextureParameteri(tex, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 175                 glTextureParameteri(tex, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
 176                 glTextureParameteri(tex, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
 177         }
 178         setup_input_for_frame(secondary_frame, ycbcr_format, fade_chain.input[1]);
 179         bool ok = fade_chain.mix_effect->set_float("strength_first", 1.0f - fade_alpha);
 180         ok |= fade_chain.mix_effect->set_float("strength_second", fade_alpha);
 181         RGBTriplet neutral_color1 = get_neutral_color(secondary_frame->exif_data);
 182         ok |= fade_chain.wb_effect[0]->set_vec3("neutral_color", (float *)&tex_neutral_color);
 183         ok |= fade_chain.wb_effect[1]->set_vec3("neutral_color", (float *)&neutral_color1);
 184         assert(ok);
 185         return fade_chain.chain.get();
 186 }
 187
 188 void setup_input_for_frame(shared_ptr<Frame> frame, const YCbCrFormat &ycbcr_format, YCbCrInput *input)
 189 {
 190         YCbCrFormat format_copy = ycbcr_format;
 191         format_copy.chroma_subsampling_x = frame->chroma_subsampling_x;
 192         format_copy.chroma_subsampling_y = frame->chroma_subsampling_y;
 193         input->change_ycbcr_format(format_copy);
 194
 195         input->set_width(frame->width);
 196         input->set_height(frame->height);
 197         input->set_texture_num(0, *frame->y);
 198         if (frame->is_semiplanar) {
 199                 input->set_texture_num(1, *frame->cbcr);
 200         } else {
 201                 input->set_texture_num(1, *frame->cb);
 202                 input->set_texture_num(2, *frame->cr);
 203         }
 204 }