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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/base/encoder_vp8.h"
#include "base/logging.h"
#include "media/base/callback.h"
#include "media/base/media.h"
#include "remoting/base/capture_data.h"
#include "remoting/proto/video.pb.h"
extern "C" {
#define VPX_CODEC_DISABLE_COMPAT 1
#include "third_party/libvpx/include/vpx/vpx_codec.h"
#include "third_party/libvpx/include/vpx/vpx_encoder.h"
#include "third_party/libvpx/include/vpx/vp8cx.h"
}
namespace remoting {
EncoderVp8::EncoderVp8()
: initialized_(false),
codec_(NULL),
image_(NULL),
last_timestamp_(0) {
}
EncoderVp8::~EncoderVp8() {
if (initialized_) {
vpx_codec_err_t ret = vpx_codec_destroy(codec_.get());
DCHECK(ret == VPX_CODEC_OK) << "Failed to destroy codec";
}
}
bool EncoderVp8::Init(int width, int height) {
codec_.reset(new vpx_codec_ctx_t());
image_.reset(new vpx_image_t());
memset(image_.get(), 0, sizeof(vpx_image_t));
image_->fmt = VPX_IMG_FMT_YV12;
// libvpx seems to require both to be assigned.
image_->d_w = width;
image_->w = width;
image_->d_h = height;
image_->h = height;
vpx_codec_enc_cfg_t config;
const vpx_codec_iface_t* algo =
(const vpx_codec_iface_t*)media::GetVp8CxAlgoAddress();
CHECK(algo);
vpx_codec_err_t ret = vpx_codec_enc_config_default(algo, &config, 0);
if (ret != VPX_CODEC_OK)
return false;
// TODO(hclam): Tune the parameters to better suit the application.
config.rc_target_bitrate = width * height * config.rc_target_bitrate
/ config.g_w / config.g_h;
config.g_w = width;
config.g_h = height;
config.g_pass = VPX_RC_ONE_PASS;
config.g_profile = 1;
config.g_threads = 2;
config.rc_min_quantizer = 0;
config.rc_max_quantizer = 15;
config.g_timebase.num = 1;
config.g_timebase.den = 30;
if (vpx_codec_enc_init(codec_.get(), algo, &config, 0))
return false;
return true;
}
static int clip_byte(int x) {
if (x > 255)
return 255;
else if (x < 0)
return 0;
else
return x;
}
bool EncoderVp8::PrepareImage(scoped_refptr<CaptureData> capture_data) {
const int plane_size = capture_data->width() * capture_data->height();
if (!yuv_image_.get()) {
// YUV image size is 1.5 times of a plane. Multiplication is performed first
// to avoid rounding error.
const int size = plane_size * 3 / 2;
yuv_image_.reset(new uint8[size]);
// Reset image value to 128 so we just need to fill in the y plane.
memset(yuv_image_.get(), 128, size);
// Fill in the information for |image_|.
unsigned char* image = reinterpret_cast<unsigned char*>(yuv_image_.get());
image_->planes[0] = image;
image_->planes[1] = image + plane_size;
// The V plane starts from 1.25 of the plane size.
image_->planes[2] = image + plane_size + plane_size / 4;
// In YV12 Y plane has full width, UV plane has half width because of
// subsampling.
image_->stride[0] = image_->w;
image_->stride[1] = image_->w / 2;
image_->stride[2] = image_->w / 2;
}
// And then do RGB->YUV conversion.
// Currently we just produce the Y channel as the average of RGB. This will
// giv ae gray scale image after conversion.
// TODO(sergeyu): Move this code to a separate routine.
// TODO(sergeyu): Optimize this code.
DCHECK(capture_data->pixel_format() == media::VideoFrame::RGB32)
<< "Only RGB32 is supported";
uint8* in = capture_data->data_planes().data[0];
const int in_stride = capture_data->data_planes().strides[0];
uint8* y_out = yuv_image_.get();
uint8* u_out = yuv_image_.get() + plane_size;
uint8* v_out = yuv_image_.get() + plane_size + plane_size / 4;
const int out_stride = image_->stride[0];
for (int i = 0; i < capture_data->height(); ++i) {
for (int j = 0; j < capture_data->width(); ++j) {
// Since the input pixel format is RGB32, there are 4 bytes per pixel.
uint8* pixel = in + 4 * j;
y_out[j] = clip_byte(((pixel[2] * 66 + pixel[1] * 129 +
pixel[0] * 25 + 128) >> 8) + 16);
if (i % 2 == 0 && j % 2 == 0) {
u_out[j / 2] = clip_byte(((pixel[2] * -38 + pixel[1] * -74 +
pixel[0] * 112 + 128) >> 8) + 128);
v_out[j / 2] = clip_byte(((pixel[2] * 112 + pixel[1] * -94 +
pixel[1] * -18 + 128) >> 8) + 128);
}
}
in += in_stride;
y_out += out_stride;
if (i % 2 == 0) {
u_out += out_stride / 2;
v_out += out_stride / 2;
}
}
return true;
}
void EncoderVp8::Encode(scoped_refptr<CaptureData> capture_data,
bool key_frame,
DataAvailableCallback* data_available_callback) {
if (!initialized_) {
bool ret = Init(capture_data->width(), capture_data->height());
// TODO(hclam): Handle error better.
DCHECK(ret) << "Initialization of encoder failed";
initialized_ = ret;
}
if (!PrepareImage(capture_data)) {
NOTREACHED() << "Can't image data for encoding";
}
// Do the actual encoding.
vpx_codec_err_t ret = vpx_codec_encode(codec_.get(), image_.get(),
last_timestamp_,
1, 0, VPX_DL_REALTIME);
DCHECK_EQ(ret, VPX_CODEC_OK)
<< "Encoding error: " << vpx_codec_err_to_string(ret) << "\n"
<< "Details: " << vpx_codec_error(codec_.get()) << "\n"
<< vpx_codec_error_detail(codec_.get());
// TODO(hclam): fix this.
last_timestamp_ += 100;
// Read the encoded data.
vpx_codec_iter_t iter = NULL;
bool got_data = false;
// TODO(hclam): Make sure we get exactly one frame from the packet.
// TODO(hclam): We should provide the output buffer to avoid one copy.
VideoPacket* message = new VideoPacket();
while (!got_data) {
const vpx_codec_cx_pkt_t* packet = vpx_codec_get_cx_data(codec_.get(),
&iter);
if (!packet)
continue;
switch (packet->kind) {
case VPX_CODEC_CX_FRAME_PKT:
got_data = true;
// TODO(sergeyu): Split each frame into multiple partitions.
message->set_data(packet->data.frame.buf, packet->data.frame.sz);
break;
default:
break;
}
}
message->mutable_format()->set_encoding(VideoPacketFormat::ENCODING_VP8);
message->set_flags(VideoPacket::FIRST_PACKET | VideoPacket::LAST_PACKET |
VideoPacket::LAST_PARTITION);
data_available_callback->Run(message);
delete data_available_callback;
}
} // namespace remoting
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