2 #include <Gfx/Graph/decoders/GPUVideoDecoder.hpp>
4 #include <libavformat/avformat.h>
18 static const constexpr
auto yuv420_filter = R
"_(#version 450
20 )_" SCORE_GFX_VIDEO_UNIFORMS R"_(
22 layout(binding=3) uniform sampler2D y_tex;
23 layout(binding=4) uniform sampler2D u_tex;
24 layout(binding=5) uniform sampler2D v_tex;
26 layout(location = 0) in vec2 v_texcoord;
27 layout(location = 0) out vec4 fragColor;
29 const vec3 R_cf = vec3(1.164383, 0.000000, 1.596027);
30 const vec3 G_cf = vec3(1.164383, -0.391762, -0.812968);
31 const vec3 B_cf = vec3(1.164383, 2.017232, 0.000000);
32 const vec3 offset = vec3(-0.0625, -0.5, -0.5);
36 float y = texture(y_tex, v_texcoord).r;
37 float u = texture(u_tex, v_texcoord).r;
38 float v = texture(v_tex, v_texcoord).r;
39 vec3 yuv = vec3(y,u,v);
41 fragColor = vec4(0.0, 0.0, 0.0, 1.0);
42 fragColor.r = dot(yuv, R_cf);
43 fragColor.g = dot(yuv, G_cf);
44 fragColor.b = dot(yuv, B_cf);
56 auto& rhi = *r.
state.rhi;
57 const auto w = decoder.width, h = decoder.height;
58 const auto fmt = QRhiTexture::R8;
62 auto tex = rhi.newTexture(fmt, {w, h}, 1, QRhiTexture::Flag{});
65 auto sampler = rhi.newSampler(
66 QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
67 QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
69 samplers.push_back({sampler, tex});
74 auto tex = rhi.newTexture(fmt, {w / 2, h / 2}, 1, QRhiTexture::Flag{});
77 auto sampler = rhi.newSampler(
78 QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
79 QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
81 samplers.push_back({sampler, tex});
86 auto tex = rhi.newTexture(fmt, {w / 2, h / 2}, 1, QRhiTexture::Flag{});
89 auto sampler = rhi.newSampler(
90 QRhiSampler::Linear, QRhiSampler::Linear, QRhiSampler::None,
91 QRhiSampler::ClampToEdge, QRhiSampler::ClampToEdge);
93 samplers.push_back({sampler, tex});
99 void exec(
RenderList&, QRhiResourceUpdateBatch& res, AVFrame& frame)
override
101 setYPixels(res, frame.data[0], frame.linesize[0]);
102 setUPixels(res, frame.data[1], frame.linesize[1]);
103 setVPixels(res, frame.data[2], frame.linesize[2]);
107 setYPixels(QRhiResourceUpdateBatch& res, uint8_t* pixels,
int stride)
const noexcept
109 const auto w = decoder.width, h = decoder.height;
110 auto y_tex = samplers[0].texture;
113 QRhiTextureUploadDescription desc{entry};
115 res.uploadTexture(y_tex, desc);
119 setUPixels(QRhiResourceUpdateBatch& res, uint8_t* pixels,
int stride)
const noexcept
121 const auto w = decoder.width / 2, h = decoder.height / 2;
122 auto u_tex = samplers[1].texture;
125 QRhiTextureUploadDescription desc{entry};
127 res.uploadTexture(u_tex, desc);
131 setVPixels(QRhiResourceUpdateBatch& res, uint8_t* pixels,
int stride)
const noexcept
133 const auto w = decoder.width / 2, h = decoder.height / 2;
134 auto v_tex = samplers[2].texture;
137 QRhiTextureUploadDescription desc{entry};
138 res.uploadTexture(v_tex, desc);
Processes and renders a video frame on the GPU.
Definition: GPUVideoDecoder.hpp:43
static QRhiTextureSubresourceUploadDescription createTextureUpload(uint8_t *pixels, int w, int h, int bytesPerPixel, int stride)
Utility method to create a QRhiTextureSubresourceUploadDescription.
Definition: GPUVideoDecoder.cpp:22
List of nodes to be rendered to an output.
Definition: RenderList.hpp:19
RenderState & state
RenderState corresponding to this RenderList.
Definition: RenderList.hpp:89
Graphics rendering pipeline for ossia score.
Definition: Filter/PreviewWidget.hpp:12
std::pair< QShader, QShader > makeShaders(const RenderState &v, QString vert, QString frag)
Get a pair of compiled vertex / fragment shaders from GLSL 4.5 sources.
Definition: score-plugin-gfx/Gfx/Graph/Utils.cpp:342
Decodes YUV420 videos.
Definition: YUV420.hpp:17
std::pair< QShader, QShader > init(RenderList &r) override
Initialize a GPUVideoDecoder.
Definition: YUV420.hpp:54
void exec(RenderList &, QRhiResourceUpdateBatch &res, AVFrame &frame) override
Decode and upload a video frame to the GPU.
Definition: YUV420.hpp:99