media/cdm/ppapi/external_clear_key/fake_cdm_video_decoder.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/cdm/ppapi/external_clear_key/fake_cdm_video_decoder.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace media {
  10
  11 FakeCdmVideoDecoder::FakeCdmVideoDecoder(cdm::Host* host)
  12     : is_initialized_(false),
  13       host_(host) {
  14 }
  15
  16 FakeCdmVideoDecoder::~FakeCdmVideoDecoder() {
  17   Deinitialize();
  18 }
  19
  20 bool FakeCdmVideoDecoder::Initialize(const cdm::VideoDecoderConfig& config) {
  21   DVLOG(1) << "Initialize()";
  22
  23   video_size_ = config.coded_size;
  24   is_initialized_ = true;
  25   return true;
  26 }
  27
  28 void FakeCdmVideoDecoder::Deinitialize() {
  29   DVLOG(1) << "Deinitialize()";
  30   is_initialized_ = false;
  31 }
  32
  33 void FakeCdmVideoDecoder::Reset() {
  34   DVLOG(1) << "Reset()";
  35 }
  36
  37 // Creates a YV12 video frame.
  38 cdm::Status FakeCdmVideoDecoder::DecodeFrame(const uint8_t* compressed_frame,
  39                                              int32_t compressed_frame_size,
  40                                              int64_t timestamp,
  41                                              cdm::VideoFrame* decoded_frame) {
  42   DVLOG(1) << "DecodeFrame()";
  43
  44   // The fake decoder does not buffer any frames internally. So if the input is
  45   // empty (EOS), just return kNeedMoreData.
  46   if (!decoded_frame)
  47     return cdm::kNeedMoreData;
  48
  49   // Choose non-zero alignment and padding on purpose for testing.
  50   const int kAlignment = 8;
  51   const int kPadding = 16;
  52   const int kPlanePadding = 128;
  53
  54   int width = video_size_.width;
  55   int height = video_size_.height;
  56   DCHECK_EQ(width % 2, 0);
  57   DCHECK_EQ(height % 2, 0);
  58
  59   int y_stride = (width + kAlignment - 1) / kAlignment * kAlignment + kPadding;
  60   int uv_stride =
  61       (width / 2 + kAlignment - 1) / kAlignment * kAlignment + kPadding;
  62   int y_rows = height;
  63   int uv_rows = height / 2;
  64   int y_offset = 0;
  65   int v_offset = y_stride * y_rows + kPlanePadding;
  66   int u_offset = v_offset + uv_stride * uv_rows + kPlanePadding;
  67   int frame_size = u_offset + uv_stride * uv_rows + kPlanePadding;
  68
  69   decoded_frame->SetFrameBuffer(host_->Allocate(frame_size));
  70   decoded_frame->FrameBuffer()->SetSize(frame_size);
  71
  72   decoded_frame->SetFormat(cdm::kYv12);
  73   decoded_frame->SetSize(video_size_);
  74   decoded_frame->SetPlaneOffset(cdm::VideoFrame::kYPlane, y_offset);
  75   decoded_frame->SetPlaneOffset(cdm::VideoFrame::kVPlane, v_offset);
  76   decoded_frame->SetPlaneOffset(cdm::VideoFrame::kUPlane, u_offset);
  77   decoded_frame->SetStride(cdm::VideoFrame::kYPlane, y_stride);
  78   decoded_frame->SetStride(cdm::VideoFrame::kVPlane, uv_stride);
  79   decoded_frame->SetStride(cdm::VideoFrame::kUPlane, uv_stride);
  80   decoded_frame->SetTimestamp(timestamp);
  81
  82   static unsigned char color = 0;
  83   color += 10;
  84
  85   memset(reinterpret_cast<void*>(decoded_frame->FrameBuffer()->Data()),
  86          color, frame_size);
  87
  88   return cdm::kSuccess;
  89 }
  90
  91 }  // namespace media