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49e0e77e40beeb318893efb434c853d813062a4b
platform-external-webrtc/modules/desktop_capture/linux/wayland/shared_screencast_stream.cc
Jan Grulich 49e0e77e40 PipeWire capturer: make use of ScreenCaptureFrameQueue 
This allows us to keep always some frame around so we can return it
everytime consumer asks us to capture a frame as before we either
returned current frame or nothing as there was no new frame available.
This will be needed in order to support mouse cursor separately as
DesktopAndCursorComposer requires frame everytime, even if it's the
same one as before so we can combine it with the mouse cursor.

Bug: webrtc:13429
Change-Id: Ice87968846870c0a880ab469d9e052b4978e658c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/239362
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Mark Foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/main@{#35956}
2022-02-08 18:02:25 +00:00

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/*
* Copyright 2022 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/desktop_capture/linux/wayland/shared_screencast_stream.h"
#include <libdrm/drm_fourcc.h>
#include <pipewire/pipewire.h>
#include <spa/param/format-utils.h>
#include <spa/param/props.h>
#include <spa/param/video/format-utils.h>
#include <spa/utils/result.h>
#include <sys/mman.h>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
#include "absl/memory/memory.h"
#include "modules/desktop_capture/linux/wayland/egl_dmabuf.h"
#include "modules/desktop_capture/screen_capture_frame_queue.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/sanitizer.h"
#include "rtc_base/string_encode.h"
#include "rtc_base/string_to_number.h"
#include "rtc_base/synchronization/mutex.h"
#if defined(WEBRTC_DLOPEN_PIPEWIRE)
#include "modules/desktop_capture/linux/wayland/pipewire_stubs.h"
using modules_desktop_capture_linux_wayland::InitializeStubs;
using modules_desktop_capture_linux_wayland::kModuleDrm;
using modules_desktop_capture_linux_wayland::kModulePipewire;
using modules_desktop_capture_linux_wayland::StubPathMap;
#endif // defined(WEBRTC_DLOPEN_PIPEWIRE)
namespace webrtc {
const int kBytesPerPixel = 4;
#if defined(WEBRTC_DLOPEN_PIPEWIRE)
const char kPipeWireLib[] = "libpipewire-0.3.so.0";
const char kDrmLib[] = "libdrm.so.2";
#endif
#if !PW_CHECK_VERSION(0, 3, 29)
#define SPA_POD_PROP_FLAG_MANDATORY (1u << 3)
#endif
#if !PW_CHECK_VERSION(0, 3, 33)
#define SPA_POD_PROP_FLAG_DONT_FIXATE (1u << 4)
#endif
struct PipeWireVersion {
int major = 0;
int minor = 0;
int micro = 0;
};
constexpr PipeWireVersion kDmaBufMinVersion = {0, 3, 24};
constexpr PipeWireVersion kDmaBufModifierMinVersion = {0, 3, 33};
PipeWireVersion ParsePipeWireVersion(const char* version) {
std::vector<std::string> parsed_version;
rtc::split(version, '.', &parsed_version);
if (parsed_version.size() != 3) {
return {};
}
absl::optional<int> major = rtc::StringToNumber<int>(parsed_version.at(0));
absl::optional<int> minor = rtc::StringToNumber<int>(parsed_version.at(1));
absl::optional<int> micro = rtc::StringToNumber<int>(parsed_version.at(2));
// Return invalid version if we failed to parse it
if (!major || !minor || !micro) {
return {0, 0, 0};
}
return {major.value(), micro.value(), micro.value()};
}
spa_pod* BuildFormat(spa_pod_builder* builder,
uint32_t format,
const std::vector<uint64_t>& modifiers) {
bool first = true;
spa_pod_frame frames[2];
spa_rectangle pw_min_screen_bounds = spa_rectangle{1, 1};
spa_rectangle pw_max_screen_bounds = spa_rectangle{UINT32_MAX, UINT32_MAX};
spa_pod_builder_push_object(builder, &frames[0], SPA_TYPE_OBJECT_Format,
SPA_PARAM_EnumFormat);
spa_pod_builder_add(builder, SPA_FORMAT_mediaType,
SPA_POD_Id(SPA_MEDIA_TYPE_video), 0);
spa_pod_builder_add(builder, SPA_FORMAT_mediaSubtype,
SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw), 0);
spa_pod_builder_add(builder, SPA_FORMAT_VIDEO_format, SPA_POD_Id(format), 0);
if (modifiers.size()) {
spa_pod_builder_prop(
builder, SPA_FORMAT_VIDEO_modifier,
SPA_POD_PROP_FLAG_MANDATORY | SPA_POD_PROP_FLAG_DONT_FIXATE);
spa_pod_builder_push_choice(builder, &frames[1], SPA_CHOICE_Enum, 0);
// modifiers from the array
for (int64_t val : modifiers) {
spa_pod_builder_long(builder, val);
// Add the first modifier twice as the very first value is the default
// option
if (first) {
spa_pod_builder_long(builder, val);
first = false;
}
}
spa_pod_builder_pop(builder, &frames[1]);
}
spa_pod_builder_add(
builder, SPA_FORMAT_VIDEO_size,
SPA_POD_CHOICE_RANGE_Rectangle(
&pw_min_screen_bounds, &pw_min_screen_bounds, &pw_max_screen_bounds),
0);
return static_cast<spa_pod*>(spa_pod_builder_pop(builder, &frames[0]));
}
class PipeWireThreadLoopLock {
public:
explicit PipeWireThreadLoopLock(pw_thread_loop* loop) : loop_(loop) {
pw_thread_loop_lock(loop_);
}
~PipeWireThreadLoopLock() { pw_thread_loop_unlock(loop_); }
private:
pw_thread_loop* const loop_;
};
class ScopedBuf {
public:
ScopedBuf() {}
ScopedBuf(uint8_t* map, int map_size, int fd)
: map_(map), map_size_(map_size), fd_(fd) {}
~ScopedBuf() {
if (map_ != MAP_FAILED) {
munmap(map_, map_size_);
}
}
operator bool() { return map_ != MAP_FAILED; }
void initialize(uint8_t* map, int map_size, int fd) {
map_ = map;
map_size_ = map_size;
fd_ = fd;
}
uint8_t* get() { return map_; }
protected:
uint8_t* map_ = static_cast<uint8_t*>(MAP_FAILED);
int map_size_;
int fd_;
};
class SharedScreenCastStreamPrivate {
public:
SharedScreenCastStreamPrivate();
~SharedScreenCastStreamPrivate();
bool StartScreenCastStream(uint32_t stream_node_id, int fd);
void StopScreenCastStream();
std::unique_ptr<DesktopFrame> CaptureFrame();
private:
uint32_t pw_stream_node_id_ = 0;
int pw_fd_ = -1;
DesktopSize desktop_size_ = {};
DesktopSize video_size_;
webrtc::Mutex queue_lock_;
ScreenCaptureFrameQueue<SharedDesktopFrame> queue_
RTC_GUARDED_BY(&queue_lock_);
int64_t modifier_;
std::unique_ptr<EglDmaBuf> egl_dmabuf_;
// PipeWire types
struct pw_context* pw_context_ = nullptr;
struct pw_core* pw_core_ = nullptr;
struct pw_stream* pw_stream_ = nullptr;
struct pw_thread_loop* pw_main_loop_ = nullptr;
spa_hook spa_core_listener_;
spa_hook spa_stream_listener_;
// A number used to verify all previous methods and the resulting
// events have been handled.
int server_version_sync_ = 0;
// Version of the running PipeWire server we communicate with
PipeWireVersion pw_server_version_;
// Version of the library used to run our code
PipeWireVersion pw_client_version_;
// event handlers
pw_core_events pw_core_events_ = {};
pw_stream_events pw_stream_events_ = {};
struct spa_video_info_raw spa_video_format_;
void ProcessBuffer(pw_buffer* buffer);
void ConvertRGBxToBGRx(uint8_t* frame, uint32_t size);
// PipeWire callbacks
static void OnCoreError(void* data,
uint32_t id,
int seq,
int res,
const char* message);
static void OnCoreDone(void* user_data, uint32_t id, int seq);
static void OnCoreInfo(void* user_data, const pw_core_info* info);
static void OnStreamParamChanged(void* data,
uint32_t id,
const struct spa_pod* format);
static void OnStreamStateChanged(void* data,
pw_stream_state old_state,
pw_stream_state state,
const char* error_message);
static void OnStreamProcess(void* data);
};
bool operator>=(const PipeWireVersion& current_pw_version,
const PipeWireVersion& required_pw_version) {
if (!current_pw_version.major && !current_pw_version.minor &&
!current_pw_version.micro) {
return false;
}
return std::tie(current_pw_version.major, current_pw_version.minor,
current_pw_version.micro) >=
std::tie(required_pw_version.major, required_pw_version.minor,
required_pw_version.micro);
}
bool operator<=(const PipeWireVersion& current_pw_version,
const PipeWireVersion& required_pw_version) {
if (!current_pw_version.major && !current_pw_version.minor &&
!current_pw_version.micro) {
return false;
}
return std::tie(current_pw_version.major, current_pw_version.minor,
current_pw_version.micro) <=
std::tie(required_pw_version.major, required_pw_version.minor,
required_pw_version.micro);
}
void SharedScreenCastStreamPrivate::OnCoreError(void* data,
uint32_t id,
int seq,
int res,
const char* message) {
SharedScreenCastStreamPrivate* that =
static_cast<SharedScreenCastStreamPrivate*>(data);
RTC_DCHECK(that);
RTC_LOG(LS_ERROR) << "PipeWire remote error: " << message;
}
void SharedScreenCastStreamPrivate::OnCoreInfo(void* data,
const pw_core_info* info) {
SharedScreenCastStreamPrivate* stream =
static_cast<SharedScreenCastStreamPrivate*>(data);
RTC_DCHECK(stream);
stream->pw_server_version_ = ParsePipeWireVersion(info->version);
}
void SharedScreenCastStreamPrivate::OnCoreDone(void* data,
uint32_t id,
int seq) {
const SharedScreenCastStreamPrivate* stream =
static_cast<SharedScreenCastStreamPrivate*>(data);
RTC_DCHECK(stream);
if (id == PW_ID_CORE && stream->server_version_sync_ == seq) {
pw_thread_loop_signal(stream->pw_main_loop_, false);
}
}
// static
void SharedScreenCastStreamPrivate::OnStreamStateChanged(
void* data,
pw_stream_state old_state,
pw_stream_state state,
const char* error_message) {
SharedScreenCastStreamPrivate* that =
static_cast<SharedScreenCastStreamPrivate*>(data);
RTC_DCHECK(that);
switch (state) {
case PW_STREAM_STATE_ERROR:
RTC_LOG(LS_ERROR) << "PipeWire stream state error: " << error_message;
break;
case PW_STREAM_STATE_PAUSED:
case PW_STREAM_STATE_STREAMING:
case PW_STREAM_STATE_UNCONNECTED:
case PW_STREAM_STATE_CONNECTING:
break;
}
}
// static
void SharedScreenCastStreamPrivate::OnStreamParamChanged(
void* data,
uint32_t id,
const struct spa_pod* format) {
SharedScreenCastStreamPrivate* that =
static_cast<SharedScreenCastStreamPrivate*>(data);
RTC_DCHECK(that);
RTC_LOG(LS_INFO) << "PipeWire stream format changed.";
if (!format || id != SPA_PARAM_Format) {
return;
}
spa_format_video_raw_parse(format, &that->spa_video_format_);
auto width = that->spa_video_format_.size.width;
auto height = that->spa_video_format_.size.height;
auto stride = SPA_ROUND_UP_N(width * kBytesPerPixel, 4);
auto size = height * stride;
that->desktop_size_ = DesktopSize(width, height);
uint8_t buffer[1024] = {};
auto builder = spa_pod_builder{buffer, sizeof(buffer)};
// Setup buffers and meta header for new format.
// When SPA_FORMAT_VIDEO_modifier is present we can use DMA-BUFs as
// the server announces support for it.
// See https://github.com/PipeWire/pipewire/blob/master/doc/dma-buf.dox
const bool has_modifier =
spa_pod_find_prop(format, nullptr, SPA_FORMAT_VIDEO_modifier);
that->modifier_ =
has_modifier ? that->spa_video_format_.modifier : DRM_FORMAT_MOD_INVALID;
std::vector<const spa_pod*> params;
const int buffer_types =
has_modifier || (that->pw_server_version_ >= kDmaBufMinVersion)
? (1 << SPA_DATA_DmaBuf) | (1 << SPA_DATA_MemFd) |
(1 << SPA_DATA_MemPtr)
: (1 << SPA_DATA_MemFd) | (1 << SPA_DATA_MemPtr);
params.push_back(reinterpret_cast<spa_pod*>(spa_pod_builder_add_object(
&builder, SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
SPA_PARAM_BUFFERS_size, SPA_POD_Int(size), SPA_PARAM_BUFFERS_stride,
SPA_POD_Int(stride), SPA_PARAM_BUFFERS_buffers,
SPA_POD_CHOICE_RANGE_Int(8, 1, 32), SPA_PARAM_BUFFERS_dataType,
SPA_POD_CHOICE_FLAGS_Int(buffer_types))));
params.push_back(reinterpret_cast<spa_pod*>(spa_pod_builder_add_object(
&builder, SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta, SPA_PARAM_META_type,
SPA_POD_Id(SPA_META_Header), SPA_PARAM_META_size,
SPA_POD_Int(sizeof(struct spa_meta_header)))));
params.push_back(reinterpret_cast<spa_pod*>(spa_pod_builder_add_object(
&builder, SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta, SPA_PARAM_META_type,
SPA_POD_Id(SPA_META_VideoCrop), SPA_PARAM_META_size,
SPA_POD_Int(sizeof(struct spa_meta_region)))));
pw_stream_update_params(that->pw_stream_, params.data(), params.size());
}
// static
void SharedScreenCastStreamPrivate::OnStreamProcess(void* data) {
SharedScreenCastStreamPrivate* that =
static_cast<SharedScreenCastStreamPrivate*>(data);
RTC_DCHECK(that);
struct pw_buffer* next_buffer;
struct pw_buffer* buffer = nullptr;
next_buffer = pw_stream_dequeue_buffer(that->pw_stream_);
while (next_buffer) {
buffer = next_buffer;
next_buffer = pw_stream_dequeue_buffer(that->pw_stream_);
if (next_buffer) {
pw_stream_queue_buffer(that->pw_stream_, buffer);
}
}
if (!buffer) {
return;
}
that->ProcessBuffer(buffer);
pw_stream_queue_buffer(that->pw_stream_, buffer);
}
SharedScreenCastStreamPrivate::SharedScreenCastStreamPrivate() {}
SharedScreenCastStreamPrivate::~SharedScreenCastStreamPrivate() {
if (pw_main_loop_) {
pw_thread_loop_stop(pw_main_loop_);
}
if (pw_stream_) {
pw_stream_destroy(pw_stream_);
}
if (pw_core_) {
pw_core_disconnect(pw_core_);
}
if (pw_context_) {
pw_context_destroy(pw_context_);
}
if (pw_main_loop_) {
pw_thread_loop_destroy(pw_main_loop_);
}
}
RTC_NO_SANITIZE("cfi-icall")
bool SharedScreenCastStreamPrivate::StartScreenCastStream(
uint32_t stream_node_id,
int fd) {
#if defined(WEBRTC_DLOPEN_PIPEWIRE)
StubPathMap paths;
// Check if the PipeWire and DRM libraries are available.
paths[kModulePipewire].push_back(kPipeWireLib);
paths[kModuleDrm].push_back(kDrmLib);
if (!InitializeStubs(paths)) {
RTC_LOG(LS_ERROR) << "Failed to load the PipeWire library and symbols.";
return false;
}
#endif // defined(WEBRTC_DLOPEN_PIPEWIRE)
egl_dmabuf_ = std::make_unique<EglDmaBuf>();
pw_stream_node_id_ = stream_node_id;
pw_fd_ = fd;
pw_init(/*argc=*/nullptr, /*argc=*/nullptr);
pw_main_loop_ = pw_thread_loop_new("pipewire-main-loop", nullptr);
pw_context_ =
pw_context_new(pw_thread_loop_get_loop(pw_main_loop_), nullptr, 0);
if (!pw_context_) {
RTC_LOG(LS_ERROR) << "Failed to create PipeWire context";
return false;
}
if (pw_thread_loop_start(pw_main_loop_) < 0) {
RTC_LOG(LS_ERROR) << "Failed to start main PipeWire loop";
return false;
}
pw_client_version_ = ParsePipeWireVersion(pw_get_library_version());
// Initialize event handlers, remote end and stream-related.
pw_core_events_.version = PW_VERSION_CORE_EVENTS;
pw_core_events_.info = &OnCoreInfo;
pw_core_events_.done = &OnCoreDone;
pw_core_events_.error = &OnCoreError;
pw_stream_events_.version = PW_VERSION_STREAM_EVENTS;
pw_stream_events_.state_changed = &OnStreamStateChanged;
pw_stream_events_.param_changed = &OnStreamParamChanged;
pw_stream_events_.process = &OnStreamProcess;
{
PipeWireThreadLoopLock thread_loop_lock(pw_main_loop_);
pw_core_ = pw_context_connect_fd(pw_context_, pw_fd_, nullptr, 0);
if (!pw_core_) {
RTC_LOG(LS_ERROR) << "Failed to connect PipeWire context";
return false;
}
pw_core_add_listener(pw_core_, &spa_core_listener_, &pw_core_events_, this);
server_version_sync_ =
pw_core_sync(pw_core_, PW_ID_CORE, server_version_sync_);
pw_thread_loop_wait(pw_main_loop_);
pw_properties* reuseProps =
pw_properties_new_string("pipewire.client.reuse=1");
pw_stream_ = pw_stream_new(pw_core_, "webrtc-consume-stream", reuseProps);
if (!pw_stream_) {
RTC_LOG(LS_ERROR) << "Failed to create PipeWire stream";
return false;
}
pw_stream_add_listener(pw_stream_, &spa_stream_listener_,
&pw_stream_events_, this);
uint8_t buffer[2048] = {};
std::vector<uint64_t> modifiers;
spa_pod_builder builder = spa_pod_builder{buffer, sizeof(buffer)};
std::vector<const spa_pod*> params;
const bool has_required_pw_client_version =
pw_client_version_ >= kDmaBufModifierMinVersion;
const bool has_required_pw_server_version =
pw_server_version_ >= kDmaBufModifierMinVersion;
for (uint32_t format : {SPA_VIDEO_FORMAT_BGRA, SPA_VIDEO_FORMAT_RGBA,
SPA_VIDEO_FORMAT_BGRx, SPA_VIDEO_FORMAT_RGBx}) {
// Modifiers can be used with PipeWire >= 0.3.33
if (has_required_pw_client_version && has_required_pw_server_version) {
modifiers = egl_dmabuf_->QueryDmaBufModifiers(format);
if (!modifiers.empty()) {
params.push_back(BuildFormat(&builder, format, modifiers));
}
}
params.push_back(BuildFormat(&builder, format, /*modifiers=*/{}));
}
if (pw_stream_connect(pw_stream_, PW_DIRECTION_INPUT, pw_stream_node_id_,
PW_STREAM_FLAG_AUTOCONNECT, params.data(),
params.size()) != 0) {
RTC_LOG(LS_ERROR) << "Could not connect receiving stream.";
return false;
}
RTC_LOG(LS_INFO) << "PipeWire remote opened.";
}
return true;
}
void SharedScreenCastStreamPrivate::StopScreenCastStream() {
if (pw_stream_) {
pw_stream_disconnect(pw_stream_);
}
}
std::unique_ptr<DesktopFrame> SharedScreenCastStreamPrivate::CaptureFrame() {
webrtc::MutexLock lock(&queue_lock_);
if (!queue_.current_frame()) {
return std::unique_ptr<DesktopFrame>{};
}
std::unique_ptr<SharedDesktopFrame> frame = queue_.current_frame()->Share();
return std::move(frame);
}
void SharedScreenCastStreamPrivate::ProcessBuffer(pw_buffer* buffer) {
spa_buffer* spa_buffer = buffer->buffer;
ScopedBuf map;
std::unique_ptr<uint8_t[]> src_unique_ptr;
uint8_t* src = nullptr;
if (spa_buffer->datas[0].chunk->size == 0) {
RTC_LOG(LS_ERROR) << "Failed to get video stream: Zero size.";
return;
}
if (spa_buffer->datas[0].type == SPA_DATA_MemFd) {
map.initialize(
static_cast<uint8_t*>(
mmap(nullptr,
spa_buffer->datas[0].maxsize + spa_buffer->datas[0].mapoffset,
PROT_READ, MAP_PRIVATE, spa_buffer->datas[0].fd, 0)),
spa_buffer->datas[0].maxsize + spa_buffer->datas[0].mapoffset,
spa_buffer->datas[0].fd);
if (!map) {
RTC_LOG(LS_ERROR) << "Failed to mmap the memory: "
<< std::strerror(errno);
return;
}
src = SPA_MEMBER(map.get(), spa_buffer->datas[0].mapoffset, uint8_t);
} else if (spa_buffer->datas[0].type == SPA_DATA_DmaBuf) {
const uint n_planes = spa_buffer->n_datas;
if (!n_planes) {
return;
}
std::vector<EglDmaBuf::PlaneData> plane_datas;
for (uint32_t i = 0; i < n_planes; ++i) {
EglDmaBuf::PlaneData data = {
static_cast<int32_t>(spa_buffer->datas[i].fd),
static_cast<uint32_t>(spa_buffer->datas[i].chunk->stride),
static_cast<uint32_t>(spa_buffer->datas[i].chunk->offset)};
plane_datas.push_back(data);
}
src_unique_ptr = egl_dmabuf_->ImageFromDmaBuf(
desktop_size_, spa_video_format_.format, plane_datas, modifier_);
src = src_unique_ptr.get();
} else if (spa_buffer->datas[0].type == SPA_DATA_MemPtr) {
src = static_cast<uint8_t*>(spa_buffer->datas[0].data);
}
if (!src) {
return;
}
struct spa_meta_region* video_metadata =
static_cast<struct spa_meta_region*>(spa_buffer_find_meta_data(
spa_buffer, SPA_META_VideoCrop, sizeof(*video_metadata)));
// Video size from metadata is bigger than an actual video stream size.
// The metadata are wrong or we should up-scale the video...in both cases
// just quit now.
if (video_metadata && (video_metadata->region.size.width >
static_cast<uint32_t>(desktop_size_.width()) ||
video_metadata->region.size.height >
static_cast<uint32_t>(desktop_size_.height()))) {
RTC_LOG(LS_ERROR) << "Stream metadata sizes are wrong!";
return;
}
// Use video metadata when video size from metadata is set and smaller than
// video stream size, so we need to adjust it.
bool video_metadata_use = false;
const struct spa_rectangle* video_metadata_size =
video_metadata ? &video_metadata->region.size : nullptr;
if (video_metadata_size && video_metadata_size->width != 0 &&
video_metadata_size->height != 0 &&
(static_cast<int>(video_metadata_size->width) < desktop_size_.width() ||
static_cast<int>(video_metadata_size->height) <
desktop_size_.height())) {
video_metadata_use = true;
}
if (video_metadata_use) {
video_size_ =
DesktopSize(video_metadata_size->width, video_metadata_size->height);
} else {
video_size_ = desktop_size_;
}
uint32_t y_offset = video_metadata_use && (video_metadata->region.position.y +
video_size_.height() <=
desktop_size_.height())
? video_metadata->region.position.y
: 0;
uint32_t x_offset = video_metadata_use && (video_metadata->region.position.x +
video_size_.width() <=
desktop_size_.width())
? video_metadata->region.position.x
: 0;
uint8_t* updated_src = src + (spa_buffer->datas[0].chunk->stride * y_offset) +
(kBytesPerPixel * x_offset);
webrtc::MutexLock lock(&queue_lock_);
// Move to the next frame if the current one is being used and shared
if (queue_.current_frame() && queue_.current_frame()->IsShared()) {
queue_.MoveToNextFrame();
if (queue_.current_frame() && queue_.current_frame()->IsShared()) {
RTC_LOG(LS_WARNING)
<< "Failed to process PipeWire buffer: no available frame";
return;
}
}
if (!queue_.current_frame() ||
!queue_.current_frame()->size().equals(video_size_)) {
std::unique_ptr<DesktopFrame> frame(new BasicDesktopFrame(
DesktopSize(video_size_.width(), video_size_.height())));
queue_.ReplaceCurrentFrame(SharedDesktopFrame::Wrap(std::move(frame)));
}
queue_.current_frame()->CopyPixelsFrom(
updated_src,
(spa_buffer->datas[0].chunk->stride - (kBytesPerPixel * x_offset)),
DesktopRect::MakeWH(video_size_.width(), video_size_.height()));
if (spa_video_format_.format == SPA_VIDEO_FORMAT_RGBx ||
spa_video_format_.format == SPA_VIDEO_FORMAT_RGBA) {
uint8_t* tmp_src = queue_.current_frame()->data();
for (int i = 0; i < video_size_.height(); ++i) {
// If both sides decided to go with the RGBx format we need to convert it
// to BGRx to match color format expected by WebRTC.
ConvertRGBxToBGRx(tmp_src, queue_.current_frame()->stride());
tmp_src += queue_.current_frame()->stride();
}
}
}
void SharedScreenCastStreamPrivate::ConvertRGBxToBGRx(uint8_t* frame,
uint32_t size) {
for (uint32_t i = 0; i < size; i += 4) {
uint8_t tempR = frame[i];
uint8_t tempB = frame[i + 2];
frame[i] = tempB;
frame[i + 2] = tempR;
}
}
SharedScreenCastStream::SharedScreenCastStream()
: private_(std::make_unique<SharedScreenCastStreamPrivate>()) {}
SharedScreenCastStream::~SharedScreenCastStream() {}
rtc::scoped_refptr<SharedScreenCastStream>
SharedScreenCastStream::CreateDefault() {
// Explicit new, to access non-public constructor.
return rtc::scoped_refptr(new SharedScreenCastStream());
}
bool SharedScreenCastStream::StartScreenCastStream(uint32_t stream_node_id,
int fd) {
return private_->StartScreenCastStream(stream_node_id, fd);
}
void SharedScreenCastStream::StopScreenCastStream() {
private_->StopScreenCastStream();
}
std::unique_ptr<DesktopFrame> SharedScreenCastStream::CaptureFrame() {
return private_->CaptureFrame();
}
} // namespace webrtc
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