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

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