Add an effect for 4:2:2 interleaved YCbCr input (UYVY).

[movit] / ycbcr_422interleaved_input.cpp

diff --git a/ycbcr_422interleaved_input.cpp b/ycbcr_422interleaved_input.cpp
new file mode 100644 (file)
index 0000000..b634289
--- /dev/null
+++ b/ycbcr_422interleaved_input.cpp
@@ -0,0 +1,149 @@
+#include <epoxy/gl.h>
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "effect_util.h"
+#include "resource_pool.h"
+#include "util.h"
+#include "ycbcr.h"
+#include "ycbcr_422interleaved_input.h"
+
+using namespace Eigen;
+using namespace std;
+
+namespace movit {
+
+YCbCr422InterleavedInput::YCbCr422InterleavedInput(const ImageFormat &image_format,
+                                                   const YCbCrFormat &ycbcr_format,
+                                                  unsigned width, unsigned height)
+       : image_format(image_format),
+         ycbcr_format(ycbcr_format),
+         width(width),
+         height(height),
+         resource_pool(NULL)
+{
+       pbo = 0;
+       texture_num[0] = texture_num[1] = 0;
+
+       assert(ycbcr_format.chroma_subsampling_x == 2);
+       assert(ycbcr_format.chroma_subsampling_y == 1);
+       assert(width % ycbcr_format.chroma_subsampling_x == 0);
+
+       widths[CHANNEL_LUMA] = width;
+       widths[CHANNEL_CHROMA] = width / ycbcr_format.chroma_subsampling_x;
+       pitches[CHANNEL_LUMA] = width;
+       pitches[CHANNEL_CHROMA] = width / ycbcr_format.chroma_subsampling_x;
+
+       pixel_data = NULL;
+}
+
+YCbCr422InterleavedInput::~YCbCr422InterleavedInput()
+{
+       for (unsigned channel = 0; channel < 2; ++channel) {
+               if (texture_num[channel] != 0) {
+                       resource_pool->release_2d_texture(texture_num[channel]);
+               }
+       }
+}
+
+void YCbCr422InterleavedInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
+{
+       for (unsigned channel = 0; channel < 2; ++channel) {
+               glActiveTexture(GL_TEXTURE0 + *sampler_num + channel);
+               check_error();
+
+               if (texture_num[channel] == 0) {
+                       // (Re-)upload the texture.
+                       GLuint format, internal_format;
+                       if (channel == CHANNEL_LUMA) {
+                               format = GL_RG;
+                               internal_format = GL_RG8;
+                       } else {        
+                               assert(channel == CHANNEL_CHROMA);
+                               format = GL_RGBA;
+                               internal_format = GL_RGBA8;
+                       }
+
+                       texture_num[channel] = resource_pool->create_2d_texture(internal_format, widths[channel], height);
+                       glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
+                       check_error();
+                       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+                       check_error();
+                       glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
+                       check_error();
+                       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+                       check_error();
+                       glPixelStorei(GL_UNPACK_ROW_LENGTH, pitches[channel]);
+                       check_error();
+                       glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, widths[channel], height, format, GL_UNSIGNED_BYTE, pixel_data);
+                       check_error();
+                       glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+                       check_error();
+                       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+                       check_error();
+                       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+                       check_error();
+               } else {
+                       glBindTexture(GL_TEXTURE_2D, texture_num[channel]);
+                       check_error();
+               }
+       }
+
+       glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
+       check_error();
+
+       // Bind samplers.
+       set_uniform_int(glsl_program_num, prefix, "tex_y", *sampler_num + 0);
+       set_uniform_int(glsl_program_num, prefix, "tex_cbcr", *sampler_num + 1);
+
+       *sampler_num += 2;
+}
+
+string YCbCr422InterleavedInput::output_fragment_shader()
+{
+       float offset[3];
+       Matrix3d ycbcr_to_rgb;
+       compute_ycbcr_matrix(ycbcr_format, offset, &ycbcr_to_rgb);
+
+       string frag_shader;
+
+       frag_shader = output_glsl_mat3("PREFIX(inv_ycbcr_matrix)", ycbcr_to_rgb);
+       frag_shader += output_glsl_vec3("PREFIX(offset)", offset[0], offset[1], offset[2]);
+
+       float cb_offset_x = compute_chroma_offset(
+               ycbcr_format.cb_x_position, ycbcr_format.chroma_subsampling_x, widths[CHANNEL_CHROMA]);
+       float cr_offset_x = compute_chroma_offset(
+               ycbcr_format.cr_x_position, ycbcr_format.chroma_subsampling_x, widths[CHANNEL_CHROMA]);
+       frag_shader += output_glsl_float("PREFIX(cb_offset_x)", cb_offset_x);
+       frag_shader += output_glsl_float("PREFIX(cr_offset_x)", cr_offset_x);
+
+       char buf[256];
+       sprintf(buf, "#define CB_CR_OFFSETS_EQUAL %d\n",
+               (fabs(ycbcr_format.cb_x_position - ycbcr_format.cr_x_position) < 1e-6));
+       frag_shader += buf;
+
+       frag_shader += read_file("ycbcr_422interleaved_input.frag");
+       return frag_shader;
+}
+
+void YCbCr422InterleavedInput::invalidate_pixel_data()
+{
+       for (unsigned channel = 0; channel < 2; ++channel) {
+               if (texture_num[channel] != 0) {
+                       resource_pool->release_2d_texture(texture_num[channel]);
+                       texture_num[channel] = 0;
+               }
+       }
+}
+
+bool YCbCr422InterleavedInput::set_int(const std::string& key, int value)
+{
+       if (key == "needs_mipmaps") {
+               // We currently do not support this.
+               return (value == 0);
+       }
+       return Effect::set_int(key, value);
+}
+
+}  // namespace movit