16 bpp video stream capture, render and WebGL usage - Realsense R200 & SR300 support.

media/renderers/skcanvas_video_renderer.cc

Index: media/renderers/skcanvas_video_renderer.cc
diff --git a/media/renderers/skcanvas_video_renderer.cc b/media/renderers/skcanvas_video_renderer.cc
index c3387ae15db6db9f9918d5192865ca36e5827313..bf85a16945018d25598a33233c0eabd825a153f7 100644
--- a/media/renderers/skcanvas_video_renderer.cc
+++ b/media/renderers/skcanvas_video_renderer.cc
@@ -4,12 +4,14 @@
 
 #include "media/renderers/skcanvas_video_renderer.h"
 
+#include <GLES3/gl3.h>
 #include <limits>
 
 #include "base/macros.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/command_buffer/common/mailbox_holder.h"
+#include "media/base/data_buffer.h"
 #include "media/base/video_frame.h"
 #include "media/base/yuv_convert.h"
 #include "skia/ext/texture_handle.h"
@@ -165,7 +167,8 @@ sk_sp<SkImage> NewSkImageFromVideoFrameNative(VideoFrame* video_frame,
   DCHECK(PIXEL_FORMAT_ARGB == video_frame->format() ||
          PIXEL_FORMAT_XRGB == video_frame->format() ||
          PIXEL_FORMAT_NV12 == video_frame->format() ||
-         PIXEL_FORMAT_UYVY == video_frame->format());
+         PIXEL_FORMAT_UYVY == video_frame->format() ||
+         PIXEL_FORMAT_Y16 == video_frame->format());
 
   const gpu::MailboxHolder& mailbox_holder = video_frame->mailbox_holder(0);
   DCHECK(mailbox_holder.texture_target == GL_TEXTURE_2D ||
@@ -347,6 +350,7 @@ void SkCanvasVideoRenderer::Paint(const scoped_refptr<VideoFrame>& video_frame,
   // frame has an unexpected format.
   if (!video_frame.get() || video_frame->natural_size().IsEmpty() ||
       !(media::IsYuvPlanar(video_frame->format()) ||
+        video_frame->format() == media::PIXEL_FORMAT_Y16 ||
         video_frame->HasTextures())) {
     SkPaint blackWithAlphaPaint;
     blackWithAlphaPaint.setAlpha(paint.getAlpha());
@@ -520,6 +524,77 @@ scoped_refptr<VideoFrame> DownShiftHighbitVideoFrame(
   }
   return ret;
 }
+
+void ConvertY16ToARGB(const VideoFrame* video_frame,
+                      void* argb_pixels,
+                      size_t argb_row_bytes) {
+  const uint8_t* source =
+      reinterpret_cast<const uint8_t*>(video_frame->visible_data(0));
+  uint8_t* out = reinterpret_cast<uint8_t*>(argb_pixels);
+  const size_t stride = video_frame->stride(0);
+  for (int i = 0; i < video_frame->visible_rect().height(); ++i) {
+    const uint8_t* row = source;
+    uint32_t* rgba = reinterpret_cast<uint32_t*>(out);
+    for (const uint8_t* row_end = row + video_frame->row_bytes(0);
+         row < row_end; ++row) {
+      // We loose the precision here and take only upper 8 bits of 16 bit data.
+      // It is important not to render Y16 as RG_88. To get the full precision
+      // use float textures with WebGL1 and e.g. R16UI or R32F textures with
+      // WebGL2.
+      uint32_t green = *++row;
+      *rgba++ = SkColorSetARGB(0xFF, green, green, green);
+    }
+    out += argb_row_bytes;
+    source += stride;
+  }
+}
+
+void FlipAndConvertY16(const uint8_t* input,
+                       uint8_t* output,
+                       unsigned format,
+                       unsigned type,
+                       bool flip_y,
+                       size_t row_bytes,
+                       size_t stride,
+                       size_t output_row_bytes,
+                       size_t height) {
+  DCHECK(input != output);
+  for (size_t i = 0; i < height; ++i) {
+    const uint16_t* in = reinterpret_cast<const uint16_t*>(input + i * stride);
+    uint8_t* out = flip_y ? output + output_row_bytes * (height - i - 1)
+                          : output + output_row_bytes * i;
+    if (type == GL_FLOAT) {
+      float* out_row = reinterpret_cast<float*>(out);
+      const uint16_t* in_end = in + row_bytes / 2;
+      if (format == GL_RGBA) {
+        while (in < in_end) {
+          float red = *in++ / 65536.f;
+          *out_row++ = red;
+          *out_row++ = red;
+          *out_row++ = red;
+          *out_row++ = 1.0f;
+        }
+      } else if (format == GL_RGB) {
+        while (in < in_end) {
+          float red = *in++ / 65536.f;
+          *out_row++ = red;
+          *out_row++ = red;
+          *out_row++ = red;
+        }
+      } else if (type == GL_RED) {
+        while (in < in_end)
+          *out_row++ = *in++ / 65536.f;
+      } else {
+        NOTREACHED();
+      }
+    } else if ((format == GL_RG && type == GL_UNSIGNED_BYTE) ||
+               (format == GL_RED_INTEGER && type == GL_UNSIGNED_SHORT)) {
+      memcpy(out, input + i * stride, row_bytes);
+    } else {
+      NOTREACHED();
+    }
+  }
+}
 }
 
 // static
@@ -531,10 +606,6 @@ void SkCanvasVideoRenderer::ConvertVideoFrameToRGBPixels(
     NOTREACHED() << "Cannot extract pixels from non-CPU frame formats.";
     return;
   }
-  if (!media::IsYuvPlanar(video_frame->format())) {
-    NOTREACHED() << "Non YUV formats are not supported";
-    return;
-  }
 
   switch (video_frame->format()) {
     case PIXEL_FORMAT_YV12:
@@ -627,6 +698,10 @@ void SkCanvasVideoRenderer::ConvertVideoFrameToRGBPixels(
       break;
     }
 
+    case PIXEL_FORMAT_Y16:
+      ConvertY16ToARGB(video_frame, rgb_pixels, row_bytes);
+      break;
+
     case PIXEL_FORMAT_NV12:
     case PIXEL_FORMAT_NV21:
     case PIXEL_FORMAT_UYVY:
@@ -637,14 +712,9 @@ void SkCanvasVideoRenderer::ConvertVideoFrameToRGBPixels(
     case PIXEL_FORMAT_RGB32:
     case PIXEL_FORMAT_MJPEG:
     case PIXEL_FORMAT_MT21:
-    // TODO(dshwang): Use either I400ToARGB or J400ToARGB depending if we want
-    // BT.601 constrained range of 16 to 240, or JPEG full range BT.601
-    // coefficients. Implement it when Y8/16 foramt is supported.
-    // crbug.com/624436
     case PIXEL_FORMAT_Y8:
-    case PIXEL_FORMAT_Y16:
     case PIXEL_FORMAT_UNKNOWN:
-      NOTREACHED();
+      NOTREACHED() << "Only YUV formats and Y16 are supported.";
   }
 }
 
@@ -744,15 +814,288 @@ bool SkCanvasVideoRenderer::CopyVideoFrameTexturesToGLTexture(
 
     SyncTokenClientImpl client(canvas_gl);
     video_frame->UpdateReleaseSyncToken(&client);
+  } else if (video_frame->format() == PIXEL_FORMAT_Y16) {
+    CopyRG8ToTexture(context_3d, destination_gl, video_frame.get(), texture,
+                     internal_format, type, flip_y);
   } else {
     CopyVideoFrameSingleTextureToGLTexture(destination_gl, video_frame.get(),
                                            texture, internal_format, type,
                                            premultiply_alpha, flip_y);
   }
+  return true;
+}
+
+bool SkCanvasVideoRenderer::TexImageImpl(const char* functionID,
+                                         unsigned target,
+                                         gpu::gles2::GLES2Interface* gl,
+                                         VideoFrame* frame,
+                                         int level,
+                                         int internalformat,
+                                         unsigned format,
+                                         unsigned type,
+                                         int xoffset,
+                                         int yoffset,
+                                         int zoffset,
+                                         bool flip_y,
+                                         bool premultiplyAlpha) {
+  DCHECK(frame);
+  DCHECK(!frame->HasTextures());
+
+  bool has_alpha = false;
+  unsigned output_bytes_per_pixel;
+  switch (frame->format()) {
+    case PIXEL_FORMAT_Y16:
+      // Allow reinterpreting RG8 buffer here as R component in FLOAT.
+      switch (format) {
+        case GL_RGBA:
+          if (type == GL_FLOAT) {
+            output_bytes_per_pixel = 4 * sizeof(GLfloat);
+            break;
+          }
+        // Pass through.
+        case GL_RGB:
+          if (type == GL_FLOAT) {
+            output_bytes_per_pixel = 3 * sizeof(GLfloat);
+            break;
+          }
+        // Pass through.
+        default:
+          return false;
+      }
+      break;
+    default:
+      return false;
+  }
+  unsigned source_bytes_per_pixel =
+      VideoFrame::PlaneBitsPerPixel(frame->format(), 0) / 8;
+  DCHECK_EQ(VideoFrame::PlaneBitsPerPixel(frame->format(), 0) % 8, 0);
 
+  if (has_alpha && premultiplyAlpha) {
+    NOTREACHED() << "Premultiply alpha is not supported.";
+    return false;
+  }
+  if (xoffset || yoffset || zoffset) {
+    NOTREACHED() << "Offsets are not supported.";
+    return false;
+  }
+
+  uint8_t* data;
+  scoped_refptr<DataBuffer> temp_buffer;
+  size_t width = frame->visible_rect().width();
+  size_t height = frame->visible_rect().height();
+  size_t output_row_bytes =
+      frame->row_bytes(0) * output_bytes_per_pixel / source_bytes_per_pixel;
+  temp_buffer = new DataBuffer(output_row_bytes * height);
+  data = temp_buffer->writable_data();
+  DCHECK_EQ(frame->format(), PIXEL_FORMAT_Y16);
+  FlipAndConvertY16(frame->visible_data(0), data, format, type, flip_y,
+                    frame->row_bytes(0), frame->stride(0), output_row_bytes,
+                    height);
+
+  if (!strcmp(functionID, "texImage2D")) {
+    gl->TexImage2D(target, level, internalformat, width, height, 0, format,
+                   type, data);
+  } else if (!strcmp(functionID, "texSubImage2D")) {
+    gl->TexSubImage2D(target, level, xoffset, yoffset, width, height, format,
+                      type, data);
+  } else {
+    DCHECK(!strcmp(functionID, "texSubImage3D"));
+    gl->TexSubImage3D(target, level, xoffset, yoffset, zoffset, width, height,
+                      1, format, type, data);
+  }
   return true;
 }
 
+void SkCanvasVideoRenderer::CopyRG8ToTexture(
+    const Context3D& context_3d,
+    gpu::gles2::GLES2Interface* target_gl,
+    VideoFrame* frame,
+    unsigned texture,
+    unsigned internal_format,
+    unsigned type,
+    bool flip_y) {
+  // TODO(astojilj): After GLES 3.2, use glCopyImageSubData for RG8 to R16UI
+  // conversion. glCopyImageSubData is already available as extension on some of
+  // the Android devices (GL_EXT_COPY_IMAGE).
+  gpu::gles2::GLES2Interface* local_gl = context_3d.gl;
+
+  // Get source texture on local_gl.
+  unsigned source_texture;
+  {
+    const gpu::MailboxHolder& mailbox_holder = frame->mailbox_holder(0);
+    DCHECK(mailbox_holder.texture_target == GL_TEXTURE_2D)
+        << mailbox_holder.texture_target;
+
+    local_gl->WaitSyncTokenCHROMIUM(mailbox_holder.sync_token.GetConstData());
+    source_texture = local_gl->CreateAndConsumeTextureCHROMIUM(
+        mailbox_holder.texture_target, mailbox_holder.mailbox.name);
+  }
+
+  // Reinterpret RG8 as 16 bit normalized and then to luminance in RGBA on
+  // local_gl. Later, do the copy on target_gl.
+  unsigned intermediate_texture;
+  local_gl->GenTextures(1, &intermediate_texture);
+  DoCopyRG8ToTexture(context_3d, source_texture, intermediate_texture, GL_RGBA,
+                     GL_RGBA, GL_FLOAT, frame->visible_rect().width(),
+                     frame->visible_rect().height(), flip_y);
+  local_gl->DeleteTextures(1, &source_texture);
+
+  // Get intermediate_texture to target_gl.
+  {
+    gpu::MailboxHolder mailbox_holder;
+    mailbox_holder.texture_target = GL_TEXTURE_2D;
+    local_gl->GenMailboxCHROMIUM(mailbox_holder.mailbox.name);
+    local_gl->ProduceTextureDirectCHROMIUM(intermediate_texture,
+                                           mailbox_holder.texture_target,
+                                           mailbox_holder.mailbox.name);
+    // Wait for mailbox creation on local context before consuming it and
+    // copying from it on the consumer context.
+    const GLuint64 fence_sync = local_gl->InsertFenceSyncCHROMIUM();
+    local_gl->ShallowFlushCHROMIUM();
+    local_gl->GenSyncTokenCHROMIUM(fence_sync,
+                                   mailbox_holder.sync_token.GetData());
+
+    target_gl->WaitSyncTokenCHROMIUM(mailbox_holder.sync_token.GetConstData());
+    uint32_t target_intermediate_texture =
+        target_gl->CreateAndConsumeTextureCHROMIUM(
+            mailbox_holder.texture_target, mailbox_holder.mailbox.name);
+
+    local_gl->DeleteTextures(1, &intermediate_texture);
+    intermediate_texture = target_intermediate_texture;
+  }
+
+  // Copy intermediate_texture to texture.
+  target_gl->CopyTextureCHROMIUM(intermediate_texture, texture, internal_format,
+                                 type, false, false, false);
+  target_gl->DeleteTextures(1, &intermediate_texture);
+
+  // Undo gr_context state changes introduced in this function.
+  context_3d.gr_context->resetContext(
+      kMisc_GrGLBackendState | kBlend_GrGLBackendState |
+      kView_GrGLBackendState | kStencil_GrGLBackendState |
+      kVertex_GrGLBackendState | kProgram_GrGLBackendState |
+      kTextureBinding_GrGLBackendState);
+  SyncTokenClientImpl client(target_gl);
+  frame->UpdateReleaseSyncToken(&client);
+}
+
+void SkCanvasVideoRenderer::DoCopyRG8ToTexture(const Context3D& context_3d,
+                                               unsigned source_texture,
+                                               unsigned texture,
+                                               unsigned format,
+                                               unsigned internal_format,
+                                               unsigned type,
+                                               unsigned width,
+                                               unsigned height,
+                                               bool flip_y) {
+  gpu::gles2::GLES2Interface* gl = context_3d.gl;
+
+  if (cached_gl_resources_gr_context_id_ != context_3d.gr_context->uniqueID()) {
+    rg8_to_texture_program_ = 0;
+    rg8_to_texture_vertices_buffer_ = 0;
+    cached_gl_resources_gr_context_id_ = context_3d.gr_context->uniqueID();
+  }
+
+  gl->EnableVertexAttribArray(0);
+  if (!rg8_to_texture_vertices_buffer_) {
+    gl->GenBuffers(1, &rg8_to_texture_vertices_buffer_);
+    gl->BindBuffer(GL_ARRAY_BUFFER, rg8_to_texture_vertices_buffer_);
+    const GLfloat vertices[] = {-1.f, -1.f, 1.f, -1.f, -1.0f, 1.f, 1.f, 1.f};
+    gl->BufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+    gl->VertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
+  }
+
+  if (!rg8_to_texture_program_) {
+    rg8_to_texture_program_ = gl->CreateProgram();
+    GLuint vertex_shader = gl->CreateShader(GL_VERTEX_SHADER);
+    std::string source = std::string(
+        "\
+          #ifdef GL_ES\n\
+          precision mediump float;\n\
+          #define TexCoordPrecision mediump\n\
+          #else\n\
+          #define TexCoordPrecision\n\
+          #endif\n\
+          uniform vec2 coord_transform;\n\
+          attribute vec2 a_pos;\n\
+          varying TexCoordPrecision vec2 v_uv;\n\
+          void main(void) {\n\
+            gl_Position = vec4(a_pos, 0, 1.0);\n\
+            v_uv = (a_pos * coord_transform) + 0.5;\n\
+          }\n");
+    const char* vertex_source = source.c_str();
+    gl->ShaderSource(vertex_shader, 1, &vertex_source, 0);
+    gl->CompileShader(vertex_shader);
+    gl->AttachShader(rg8_to_texture_program_, vertex_shader);
+
+    GLuint fragment_shader = gl->CreateShader(GL_FRAGMENT_SHADER);
+    source = std::string(
+        "\
+          #ifdef GL_ES\n\
+          precision mediump float;\n\
+          #define TexCoordPrecision mediump\n\
+          #else\n\
+          #define TexCoordPrecision\n\
+          #endif\n\
+          uniform sampler2D u_sampler;\n\
+          varying TexCoordPrecision vec2 v_uv;\n\
+          void main(void) {\n\
+            vec4 color = texture2D(u_sampler, v_uv);\n\
+            gl_FragColor.rgb = vec3((color.r * 0.00390625) + color.g);\n\
+          }\n");
+    const char* fragment_source = source.c_str();
+    gl->ShaderSource(fragment_shader, 1, &fragment_source, 0);
+    gl->CompileShader(fragment_shader);
+
+    gl->AttachShader(rg8_to_texture_program_, fragment_shader);
+
+    gl->BindAttribLocation(rg8_to_texture_program_, 0, "a_pos");
+    gl->LinkProgram(rg8_to_texture_program_);
+  }
+
+  gl->UseProgram(rg8_to_texture_program_);
+  gl->Uniform1i(gl->GetUniformLocation(rg8_to_texture_program_, "u_sampler"),
+                0);
+  gl->Uniform2f(
+      gl->GetUniformLocation(rg8_to_texture_program_, "coord_transform"), 0.5,
+      flip_y ? -0.5 : 0.5);
+
+  GLuint fbo;
+  gl->GenFramebuffers(1, &fbo);
+  gl->ActiveTexture(GL_TEXTURE0);
+  unsigned target = GL_TEXTURE_2D;
+  gl->BindTexture(target, texture);
+  gl->TexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format,
+                 type, 0);
+
+  gl->TexParameterf(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  gl->TexParameterf(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  gl->TexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  gl->TexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
+  gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target,
+                           texture, 0);
+
+  gl->BindTexture(target, source_texture);
+  gl->TexParameterf(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  gl->TexParameterf(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+  gl->TexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  gl->TexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+  gl->Disable(GL_DEPTH_TEST);
+  gl->Disable(GL_STENCIL_TEST);
+  gl->Disable(GL_CULL_FACE);
+  gl->ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+  gl->DepthMask(GL_FALSE);
+  gl->Disable(GL_BLEND);
+  gl->Disable(GL_SCISSOR_TEST);
+  gl->Viewport(0, 0, width, height);
+  gl->DrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+  gl->Flush();
+  gl->BindFramebuffer(GL_FRAMEBUFFER, 0);
+  gl->DeleteFramebuffers(1, &fbo);
+}
+
 void SkCanvasVideoRenderer::ResetCache() {
   DCHECK(thread_checker_.CalledOnValidThread());
   // Clear cached values.
@@ -777,6 +1120,8 @@ bool SkCanvasVideoRenderer::UpdateLastImage(
         last_image_ =
             NewSkImageFromVideoFrameYUVTextures(video_frame.get(), context_3d);
       } else {
+        // TODO(astojilj): For Y16 on RG textures we don't want to paint 16 bit
+        // split to 8 bit R & G. Implement using CopyRG8ToTexture.
         last_image_ =
             NewSkImageFromVideoFrameNative(video_frame.get(), context_3d);
       }