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// Copyright 2019 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 "cast/standalone_receiver/sdl_video_player.h"
#include <sstream>
#include <utility>
#include "cast/standalone_receiver/avcodec_glue.h"
#include "util/enum_name_table.h"
#include "util/osp_logging.h"
#include "util/trace_logging.h"
namespace openscreen {
namespace cast {
namespace {
constexpr char kVideoMediaType[] = "video";
} // namespace
constexpr EnumNameTable<VideoCodec, 6> kFfmpegCodecDescriptors{
{{"h264", VideoCodec::kH264},
{"vp8", VideoCodec::kVp8},
{"hevc", VideoCodec::kHevc},
{"vp9", VideoCodec::kVp9},
{"libaom-av1", VideoCodec::kAv1}}};
SDLVideoPlayer::SDLVideoPlayer(ClockNowFunctionPtr now_function,
TaskRunner* task_runner,
Receiver* receiver,
VideoCodec codec,
SDL_Renderer* renderer,
std::function<void()> error_callback)
: SDLPlayerBase(now_function,
task_runner,
receiver,
GetEnumName(kFfmpegCodecDescriptors, codec).value(),
std::move(error_callback),
kVideoMediaType),
renderer_(renderer) {
OSP_DCHECK(renderer_);
}
SDLVideoPlayer::~SDLVideoPlayer() = default;
bool SDLVideoPlayer::RenderWhileIdle(
const SDLPlayerBase::PresentableFrame* frame) {
TRACE_DEFAULT_SCOPED(TraceCategory::kStandaloneReceiver);
// Attempt to re-render the same content.
if (state() == kPresented && frame) {
const auto result = RenderNextFrame(*frame);
if (result) {
return true;
}
OnFatalError(result.error().message());
// Fall-through to the "red splash" rendering below.
}
if (state() == kError) {
// Paint "red splash" to indicate an error state.
constexpr struct { int r = 128, g = 0, b = 0, a = 255; } kRedSplashColor;
SDL_SetRenderDrawColor(renderer_, kRedSplashColor.r, kRedSplashColor.g,
kRedSplashColor.b, kRedSplashColor.a);
SDL_RenderClear(renderer_);
} else if (state() == kWaitingForFirstFrame || !frame) {
// Paint "blue splash" to indicate the "waiting for first frame" state.
constexpr struct { int r = 0, g = 0, b = 128, a = 255; } kBlueSplashColor;
SDL_SetRenderDrawColor(renderer_, kBlueSplashColor.r, kBlueSplashColor.g,
kBlueSplashColor.b, kBlueSplashColor.a);
SDL_RenderClear(renderer_);
}
return state() != kScheduledToPresent;
}
ErrorOr<Clock::time_point> SDLVideoPlayer::RenderNextFrame(
const SDLPlayerBase::PresentableFrame& frame) {
TRACE_DEFAULT_SCOPED(TraceCategory::kStandaloneReceiver);
OSP_DCHECK(frame.decoded_frame);
const AVFrame& picture = *frame.decoded_frame;
// Punt if the |picture| format is not compatible with those supported by SDL.
const uint32_t sdl_format = GetSDLPixelFormat(picture);
if (sdl_format == SDL_PIXELFORMAT_UNKNOWN) {
std::ostringstream error;
error << "SDL does not support AVPixelFormat " << picture.format;
return Error(Error::Code::kUnknownError, error.str());
}
// If there is already a SDL texture, check that its format and size matches
// that of |picture|. If not, release the existing texture.
if (texture_) {
uint32_t texture_format = SDL_PIXELFORMAT_UNKNOWN;
int texture_width = -1;
int texture_height = -1;
SDL_QueryTexture(texture_.get(), &texture_format, nullptr, &texture_width,
&texture_height);
if (texture_format != sdl_format || texture_width != picture.width ||
texture_height != picture.height) {
texture_.reset();
}
}
// If necessary, recreate a SDL texture having the same format and size as
// that of |picture|.
if (!texture_) {
const auto EvalDescriptionString = [&] {
std::ostringstream error;
error << SDL_GetPixelFormatName(sdl_format) << " at " << picture.width
<< "×" << picture.height;
return error.str();
};
OSP_LOG_INFO << "Creating SDL texture for " << EvalDescriptionString();
texture_ =
MakeUniqueSDLTexture(renderer_, sdl_format, SDL_TEXTUREACCESS_STREAMING,
picture.width, picture.height);
if (!texture_) {
std::ostringstream error;
error << "Unable to (re)create SDL texture for format: "
<< EvalDescriptionString();
return Error(Error::Code::kUnknownError, error.str());
}
}
// Upload the |picture_| to the SDL texture.
void* pixels = nullptr;
int stride = 0;
SDL_LockTexture(texture_.get(), nullptr, &pixels, &stride);
const auto picture_format = static_cast<AVPixelFormat>(picture.format);
const int pixels_size = av_image_get_buffer_size(
picture_format, picture.width, picture.height, stride);
constexpr int kSDLTextureRowAlignment = 1; // SDL doesn't use word-alignment.
av_image_copy_to_buffer(static_cast<uint8_t*>(pixels), pixels_size,
picture.data, picture.linesize, picture_format,
picture.width, picture.height,
kSDLTextureRowAlignment);
SDL_UnlockTexture(texture_.get());
// Render the SDL texture to the render target. Quality-related issues that a
// production-worthy player should account for that are not being done here:
//
// 1. Need to account for AVPicture's sample_aspect_ratio property. Otherwise,
// content may appear "squashed" in one direction to the user.
//
// 2. SDL has no concept of color space, and so the color information provided
// with the AVPicture might not match the assumptions being made within
// SDL. Content may appear with washed-out colors, not-entirely-black
// blacks, striped gradients, etc.
const SDL_Rect src_rect = {
static_cast<int>(picture.crop_left), static_cast<int>(picture.crop_top),
picture.width - static_cast<int>(picture.crop_left + picture.crop_right),
picture.height -
static_cast<int>(picture.crop_top + picture.crop_bottom)};
SDL_Rect dst_rect = {0, 0, 0, 0};
SDL_RenderGetLogicalSize(renderer_, &dst_rect.w, &dst_rect.h);
if (src_rect.w != dst_rect.w || src_rect.h != dst_rect.h) {
// Make the SDL rendering size the same as the frame's visible size. This
// lets SDL automatically handle letterboxing and scaling details, so that
// the video fits within the on-screen window.
dst_rect.w = src_rect.w;
dst_rect.h = src_rect.h;
SDL_RenderSetLogicalSize(renderer_, dst_rect.w, dst_rect.h);
}
// Clear with black, for the "letterboxing" borders.
SDL_SetRenderDrawColor(renderer_, 0, 0, 0, 255);
SDL_RenderClear(renderer_);
SDL_RenderCopy(renderer_, texture_.get(), &src_rect, &dst_rect);
return frame.presentation_time;
}
void SDLVideoPlayer::Present() {
TRACE_DEFAULT_SCOPED(TraceCategory::kStandaloneReceiver);
SDL_RenderPresent(renderer_);
}
// static
uint32_t SDLVideoPlayer::GetSDLPixelFormat(const AVFrame& picture) {
switch (picture.format) {
case AV_PIX_FMT_NONE:
break;
case AV_PIX_FMT_YUV420P:
return SDL_PIXELFORMAT_IYUV;
case AV_PIX_FMT_YUYV422:
return SDL_PIXELFORMAT_YUY2;
case AV_PIX_FMT_UYVY422:
return SDL_PIXELFORMAT_UYVY;
case AV_PIX_FMT_YVYU422:
return SDL_PIXELFORMAT_YVYU;
case AV_PIX_FMT_NV12:
return SDL_PIXELFORMAT_NV12;
case AV_PIX_FMT_NV21:
return SDL_PIXELFORMAT_NV21;
case AV_PIX_FMT_RGB24:
return SDL_PIXELFORMAT_RGB24;
case AV_PIX_FMT_BGR24:
return SDL_PIXELFORMAT_BGR24;
case AV_PIX_FMT_ARGB:
return SDL_PIXELFORMAT_ARGB32;
case AV_PIX_FMT_RGBA:
return SDL_PIXELFORMAT_RGBA32;
case AV_PIX_FMT_ABGR:
return SDL_PIXELFORMAT_ABGR32;
case AV_PIX_FMT_BGRA:
return SDL_PIXELFORMAT_BGRA32;
default:
break;
}
return SDL_PIXELFORMAT_UNKNOWN;
}
} // namespace cast
} // namespace openscreen
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