content/renderer/media/rtc_video_encoder_factory.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 "content/renderer/media/rtc_video_encoder_factory.h"
   6
   7 #include "content/common/gpu/client/gpu_video_encode_accelerator_host.h"
   8 #include "content/renderer/media/rtc_video_encoder.h"
   9 #include "media/filters/gpu_video_accelerator_factories.h"
  10 #include "media/video/video_encode_accelerator.h"
  11
  12 namespace content {
  13
  14 namespace {
  15
  16 // Translate from media::VideoEncodeAccelerator::SupportedProfile to
  17 // one or more instances of cricket::WebRtcVideoEncoderFactory::VideoCodec
  18 void VEAToWebRTCCodecs(
  19     std::vector<cricket::WebRtcVideoEncoderFactory::VideoCodec>* codecs,
  20     const media::VideoEncodeAccelerator::SupportedProfile& profile) {
  21   int width = profile.max_resolution.width();
  22   int height = profile.max_resolution.height();
  23   int fps = profile.max_framerate.numerator;
  24   DCHECK_EQ(profile.max_framerate.denominator, 1U);
  25
  26   if (profile.profile >= media::VP8PROFILE_MIN &&
  27       profile.profile <= media::VP8PROFILE_MAX) {
  28     codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
  29         webrtc::kVideoCodecVP8, "VP8", width, height, fps));
  30   } else if (profile.profile >= media::H264PROFILE_MIN &&
  31              profile.profile <= media::H264PROFILE_MAX) {
  32     codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
  33         webrtc::kVideoCodecGeneric, "CAST1", width, height, fps));
  34     codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
  35         webrtc::kVideoCodecH264, "H264", width, height, fps));
  36   }
  37 }
  38
  39 // Translate from cricket::WebRtcVideoEncoderFactory::VideoCodec to
  40 // media::VideoCodecProfile.  Pick a default profile for each codec type.
  41 media::VideoCodecProfile WebRTCCodecToVideoCodecProfile(
  42     webrtc::VideoCodecType type) {
  43   switch (type) {
  44     case webrtc::kVideoCodecVP8:
  45       return media::VP8PROFILE_ANY;
  46     case webrtc::kVideoCodecH264:
  47     case webrtc::kVideoCodecGeneric:
  48       return media::H264PROFILE_MAIN;
  49     default:
  50       return media::VIDEO_CODEC_PROFILE_UNKNOWN;
  51   }
  52 }
  53
  54 }  // anonymous namespace
  55
  56 RTCVideoEncoderFactory::RTCVideoEncoderFactory(
  57     const scoped_refptr<media::GpuVideoAcceleratorFactories>& gpu_factories)
  58     : gpu_factories_(gpu_factories) {
  59   // Query media::VideoEncodeAccelerator (statically) for our supported codecs.
  60   std::vector<media::VideoEncodeAccelerator::SupportedProfile> profiles =
  61       GpuVideoEncodeAcceleratorHost::GetSupportedProfiles();
  62   for (size_t i = 0; i < profiles.size(); ++i)
  63     VEAToWebRTCCodecs(&codecs_, profiles[i]);
  64 }
  65
  66 RTCVideoEncoderFactory::~RTCVideoEncoderFactory() {}
  67
  68 webrtc::VideoEncoder* RTCVideoEncoderFactory::CreateVideoEncoder(
  69     webrtc::VideoCodecType type) {
  70   bool found = false;
  71   for (size_t i = 0; i < codecs_.size(); ++i) {
  72     if (codecs_[i].type == type) {
  73       found = true;
  74       break;
  75     }
  76   }
  77   if (!found)
  78     return NULL;
  79   return new RTCVideoEncoder(
  80       type, WebRTCCodecToVideoCodecProfile(type), gpu_factories_);
  81 }
  82
  83 void RTCVideoEncoderFactory::AddObserver(Observer* observer) {
  84   // No-op: our codec list is populated on installation.
  85 }
  86
  87 void RTCVideoEncoderFactory::RemoveObserver(Observer* observer) {}
  88
  89 const std::vector<cricket::WebRtcVideoEncoderFactory::VideoCodec>&
  90 RTCVideoEncoderFactory::codecs() const {
  91   return codecs_;
  92 }
  93
  94 void RTCVideoEncoderFactory::DestroyVideoEncoder(
  95     webrtc::VideoEncoder* encoder) {
  96   delete encoder;
  97 }
  98
  99 }  // namespace content