OBS 錄製視頻

一開始錄製按鈕

1）托盤菜單

	connect(sysTrayRecord, SIGNAL(triggered()),
			this, SLOT(on_recordButton_clicked()));

void OBSBasic::SystemTrayInit()
{
	trayIcon = new QSystemTrayIcon(QIcon(":/res/images/obs.png"),
			this);
	trayIcon->setToolTip("OBS Studio");

	showHide = new QAction(QTStr("Basic.SystemTray.Show"),
			trayIcon);
	sysTrayStream = new QAction(QTStr("Basic.Main.StartStreaming"),
			trayIcon);
	sysTrayRecord = new QAction(QTStr("Basic.Main.StartRecording"),
			trayIcon);
	sysTrayReplayBuffer = new QAction(QTStr("Basic.Main.StartReplayBuffer"),
			trayIcon);
	exit = new QAction(QTStr("Exit"),
			trayIcon);

	if (outputHandler && !outputHandler->replayBuffer)
		sysTrayReplayBuffer->setEnabled(false);

	connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
			this,
			SLOT(IconActivated(QSystemTrayIcon::ActivationReason)));
	connect(showHide, SIGNAL(triggered()),
			this, SLOT(ToggleShowHide()));
	connect(sysTrayStream, SIGNAL(triggered()),
			this, SLOT(on_streamButton_clicked()));
	connect(sysTrayRecord, SIGNAL(triggered()),
			this, SLOT(on_recordButton_clicked()));
	connect(sysTrayReplayBuffer.data(), &QAction::triggered,
			this, &OBSBasic::ReplayBufferClicked);
	connect(exit, SIGNAL(triggered()),
			this, SLOT(close()));

	QMenu *previewProjector = new QMenu(QTStr("PreviewProjector"));
	AddProjectorMenuMonitors(previewProjector, this,
			SLOT(OpenPreviewProjector()));

	trayMenu = new QMenu;
	trayMenu->addAction(showHide);
	trayMenu->addMenu(previewProjector);
	trayMenu->addAction(sysTrayStream);
	trayMenu->addAction(sysTrayRecord);
	trayMenu->addAction(sysTrayReplayBuffer);
	trayMenu->addAction(exit);
	trayIcon->setContextMenu(trayMenu);
}

2） recordButton默認槽函數 on_recordButton_clicked()

3）開始錄製處理函數


void OBSBasic::on_recordButton_clicked()
{
	if (outputHandler->RecordingActive())
		StopRecording();
	else
		StartRecording();
}

二視頻路徑

1）

C:\Users\Administrator\Videos

string GetDefaultVideoSavePath()
{
	wchar_t path_utf16[MAX_PATH];
	char    path_utf8[MAX_PATH]  = {};

	SHGetFolderPathW(NULL, CSIDL_MYVIDEO, NULL, SHGFP_TYPE_CURRENT,
			path_utf16);

	os_wcs_to_utf8(path_utf16, wcslen(path_utf16), path_utf8, MAX_PATH);
	return string(path_utf8);
}

2）獲得路徑

ConfigFile basicConfig; //默認配置

InitBasicConfigDefaults() 設置默認路徑

bool OBSBasic::InitBasicConfigDefaults()
{
	QList<QScreen*> screens = QGuiApplication::screens();

	if (!screens.size()) {
		OBSErrorBox(NULL, "There appears to be no monitors.  Er, this "
		                  "technically shouldn't be possible.");
		return false;
	}

	QScreen *primaryScreen = QGuiApplication::primaryScreen();

	uint32_t cx = primaryScreen->size().width();
	uint32_t cy = primaryScreen->size().height();

	bool oldResolutionDefaults = config_get_bool(App()->GlobalConfig(),
			"General", "Pre19Defaults");

	/* use 1920x1080 for new default base res if main monitor is above
	 * 1920x1080, but don't apply for people from older builds -- only to
	 * new users */
	if (!oldResolutionDefaults && (cx * cy) > (1920 * 1080)) {
		cx = 1920;
		cy = 1080;
	}

	/* ----------------------------------------------------- */
	/* move over mixer values in advanced if older config */
	if (config_has_user_value(basicConfig, "AdvOut", "RecTrackIndex") &&
	    !config_has_user_value(basicConfig, "AdvOut", "RecTracks")) {

		uint64_t track = config_get_uint(basicConfig, "AdvOut",
				"RecTrackIndex");
		track = 1ULL << (track - 1);
		config_set_uint(basicConfig, "AdvOut", "RecTracks", track);
		config_remove_value(basicConfig, "AdvOut", "RecTrackIndex");
		config_save_safe(basicConfig, "tmp", nullptr);
	}

	/* ----------------------------------------------------- */

	config_set_default_string(basicConfig, "Output", "Mode", "Simple");

	config_set_default_string(basicConfig, "SimpleOutput", "FilePath",  //......
			GetDefaultVideoSavePath().c_str());
	config_set_default_string(basicConfig, "SimpleOutput", "RecFormat",
			"flv");
	config_set_default_uint  (basicConfig, "SimpleOutput", "VBitrate",
			2500);
	config_set_default_string(basicConfig, "SimpleOutput", "StreamEncoder",
			SIMPLE_ENCODER_X264);
	config_set_default_uint  (basicConfig, "SimpleOutput", "ABitrate", 160);
	config_set_default_bool  (basicConfig, "SimpleOutput", "UseAdvanced",
			false);
	config_set_default_bool  (basicConfig, "SimpleOutput", "EnforceBitrate",
			true);
	config_set_default_string(basicConfig, "SimpleOutput", "Preset",
			"veryfast");
	config_set_default_string(basicConfig, "SimpleOutput", "RecQuality",
			"Stream");
	config_set_default_string(basicConfig, "SimpleOutput", "RecEncoder",
			SIMPLE_ENCODER_X264);
	config_set_default_bool(basicConfig, "SimpleOutput", "RecRB", false);
	config_set_default_int(basicConfig, "SimpleOutput", "RecRBTime", 20);
	config_set_default_int(basicConfig, "SimpleOutput", "RecRBSize", 512);
	config_set_default_string(basicConfig, "SimpleOutput", "RecRBPrefix",
			"Replay");

	config_set_default_bool  (basicConfig, "AdvOut", "ApplyServiceSettings",
			true);
	config_set_default_bool  (basicConfig, "AdvOut", "UseRescale", false);
	config_set_default_uint  (basicConfig, "AdvOut", "TrackIndex", 1);
	config_set_default_string(basicConfig, "AdvOut", "Encoder", "obs_x264");

	config_set_default_string(basicConfig, "AdvOut", "RecType", "Standard");

	config_set_default_string(basicConfig, "AdvOut", "RecFilePath",
			GetDefaultVideoSavePath().c_str());
	config_set_default_string(basicConfig, "AdvOut", "RecFormat", "flv");
	config_set_default_bool  (basicConfig, "AdvOut", "RecUseRescale",
			false);
	config_set_default_uint  (basicConfig, "AdvOut", "RecTracks", (1<<0));
	config_set_default_string(basicConfig, "AdvOut", "RecEncoder",
			"none");

	config_set_default_bool  (basicConfig, "AdvOut", "FFOutputToFile",
			true);
	config_set_default_string(basicConfig, "AdvOut", "FFFilePath",
			GetDefaultVideoSavePath().c_str());
	config_set_default_string(basicConfig, "AdvOut", "FFExtension", "mp4");
	config_set_default_uint  (basicConfig, "AdvOut", "FFVBitrate", 2500);
	config_set_default_uint  (basicConfig, "AdvOut", "FFVGOPSize", 250);
	config_set_default_bool  (basicConfig, "AdvOut", "FFUseRescale",
			false);
	config_set_default_bool  (basicConfig, "AdvOut", "FFIgnoreCompat",
			false);
	config_set_default_uint  (basicConfig, "AdvOut", "FFABitrate", 160);
	config_set_default_uint  (basicConfig, "AdvOut", "FFAudioTrack", 1);

	config_set_default_uint  (basicConfig, "AdvOut", "Track1Bitrate", 160);
	config_set_default_uint  (basicConfig, "AdvOut", "Track2Bitrate", 160);
	config_set_default_uint  (basicConfig, "AdvOut", "Track3Bitrate", 160);
	config_set_default_uint  (basicConfig, "AdvOut", "Track4Bitrate", 160);
	config_set_default_uint  (basicConfig, "AdvOut", "Track5Bitrate", 160);
	config_set_default_uint  (basicConfig, "AdvOut", "Track6Bitrate", 160);

	config_set_default_uint  (basicConfig, "Video", "BaseCX",   cx);
	config_set_default_uint  (basicConfig, "Video", "BaseCY",   cy);

	/* don't allow BaseCX/BaseCY to be susceptible to defaults changing */
	if (!config_has_user_value(basicConfig, "Video", "BaseCX") ||
	    !config_has_user_value(basicConfig, "Video", "BaseCY")) {
		config_set_uint(basicConfig, "Video", "BaseCX", cx);
		config_set_uint(basicConfig, "Video", "BaseCY", cy);
		config_save_safe(basicConfig, "tmp", nullptr);
	}

	config_set_default_string(basicConfig, "Output", "FilenameFormatting",
			"%CCYY-%MM-%DD %hh-%mm-%ss");

	config_set_default_bool  (basicConfig, "Output", "DelayEnable", false);
	config_set_default_uint  (basicConfig, "Output", "DelaySec", 20);
	config_set_default_bool  (basicConfig, "Output", "DelayPreserve", true);

	config_set_default_bool  (basicConfig, "Output", "Reconnect", true);
	config_set_default_uint  (basicConfig, "Output", "RetryDelay", 10);
	config_set_default_uint  (basicConfig, "Output", "MaxRetries", 20);

	config_set_default_string(basicConfig, "Output", "BindIP", "default");
	config_set_default_bool  (basicConfig, "Output", "NewSocketLoopEnable",
			false);
	config_set_default_bool  (basicConfig, "Output", "LowLatencyEnable",
			false);

	int i = 0;
	uint32_t scale_cx = cx;
	uint32_t scale_cy = cy;

	/* use a default scaled resolution that has a pixel count no higher
	 * than 1280x720 */
	while (((scale_cx * scale_cy) > (1280 * 720)) && scaled_vals[i] > 0.0) {
		double scale = scaled_vals[i++];
		scale_cx = uint32_t(double(cx) / scale);
		scale_cy = uint32_t(double(cy) / scale);
	}

	config_set_default_uint  (basicConfig, "Video", "OutputCX", scale_cx);
	config_set_default_uint  (basicConfig, "Video", "OutputCY", scale_cy);

	/* don't allow OutputCX/OutputCY to be susceptible to defaults
	 * changing */
	if (!config_has_user_value(basicConfig, "Video", "OutputCX") ||
	    !config_has_user_value(basicConfig, "Video", "OutputCY")) {
		config_set_uint(basicConfig, "Video", "OutputCX", scale_cx);
		config_set_uint(basicConfig, "Video", "OutputCY", scale_cy);
		config_save_safe(basicConfig, "tmp", nullptr);
	}

	config_set_default_uint  (basicConfig, "Video", "FPSType", 0);
	config_set_default_string(basicConfig, "Video", "FPSCommon", "30");
	config_set_default_uint  (basicConfig, "Video", "FPSInt", 30);
	config_set_default_uint  (basicConfig, "Video", "FPSNum", 30);
	config_set_default_uint  (basicConfig, "Video", "FPSDen", 1);
	config_set_default_string(basicConfig, "Video", "ScaleType", "bicubic");
	config_set_default_string(basicConfig, "Video", "ColorFormat", "NV12");
	config_set_default_string(basicConfig, "Video", "ColorSpace", "601");
	config_set_default_string(basicConfig, "Video", "ColorRange",
			"Partial");

	config_set_default_string(basicConfig, "Audio", "MonitoringDeviceId",
			"default");
	config_set_default_string(basicConfig, "Audio", "MonitoringDeviceName",
			Str("Basic.Settings.Advanced.Audio.MonitoringDevice"
				".Default"));
	config_set_default_uint  (basicConfig, "Audio", "SampleRate", 44100);
	config_set_default_string(basicConfig, "Audio", "ChannelSetup",
			"Stereo");

	return true;
}

獲得視頻保存路徑

	const char *path = config_get_string(main->Config(), "SimpleOutput",
			"FilePath");

3）保存路徑

void OBSBasicSettings::SaveOutputSettings()
{
	config_set_string(main->Config(), "Output", "Mode",
			OutputModeFromIdx(ui->outputMode->currentIndex()));


	SaveEdit(ui->simpleOutputPath, "SimpleOutput", "FilePath");

void OBSBasicSettings::SaveEdit(QLineEdit *widget, const char *section,
		const char *value)
{
	if (WidgetChanged(widget))
		config_set_string(main->Config(), section, value,
				QT_TO_UTF8(widget->text()));
}

三開始錄製

1）開始錄製

void OBSBasic::StartRecording()
{
	if (outputHandler->RecordingActive())
		return;
	if (disableOutputsRef)
		return;

	if (api)
		api->on_event(OBS_FRONTEND_EVENT_RECORDING_STARTING);

	SaveProject();
	outputHandler->StartRecording();
}

bool SimpleOutput::StartRecording()
{
	UpdateRecording();
	if (!ConfigureRecording(false))
		return false;
	if (!obs_output_start(fileOutput))  {
		QString error_reason;
		const char *error = obs_output_get_last_error(fileOutput);
		if (error)
			error_reason = QT_UTF8(error);
		else
			error_reason = QTStr("Output.StartFailedGeneric");
		QMessageBox::critical(main,
			QTStr("Output.StartRecordingFailed"),
			error_reason);
		return false;
	}

	return true;
}

2）錄製的視頻文件名和路徑

路徑：

const char *path = config_get_string(main->Config(),
"SimpleOutput", "FilePath");

D:/錄像

const char *filenameFormat = config_get_string(main->Config(), "Output",
"FilenameFormatting");

%CCYY-%MM-%DD %hh-%mm-%ss

bool SimpleOutput::ConfigureRecording(bool updateReplayBuffer)
{
	const char *path = config_get_string(main->Config(),
			"SimpleOutput", "FilePath");
	const char *format = config_get_string(main->Config(),
			"SimpleOutput", "RecFormat");
	const char *mux = config_get_string(main->Config(), "SimpleOutput",
			"MuxerCustom");
	bool noSpace = config_get_bool(main->Config(), "SimpleOutput",
			"FileNameWithoutSpace");
	const char *filenameFormat = config_get_string(main->Config(), "Output",
				"FilenameFormatting");
	bool overwriteIfExists = config_get_bool(main->Config(), "Output",
				"OverwriteIfExists");
	const char *rbPrefix = config_get_string(main->Config(), "SimpleOutput",
				"RecRBPrefix");
	const char *rbSuffix = config_get_string(main->Config(), "SimpleOutput",
				"RecRBSuffix");
	int rbTime = config_get_int(main->Config(), "SimpleOutput",
			"RecRBTime");
	int rbSize = config_get_int(main->Config(), "SimpleOutput",
			"RecRBSize");

	os_dir_t *dir = path && path[0] ? os_opendir(path) : nullptr;

	if (!dir) {
		if (main->isVisible())
			OBSMessageBox::information(main,
					QTStr("Output.BadPath.Title"),
					QTStr("Output.BadPath.Text"));
		else
			main->SysTrayNotify(QTStr("Output.BadPath.Text"),
					QSystemTrayIcon::Warning);
		return false;
	}

	os_closedir(dir);

	string strPath;
	strPath += path;

	char lastChar = strPath.back();
	if (lastChar != '/' && lastChar != '\\')
		strPath += "/";

	strPath += GenerateSpecifiedFilename(ffmpegOutput ? "avi" : format,
			noSpace, filenameFormat);
	ensure_directory_exists(strPath);
	if (!overwriteIfExists)
		FindBestFilename(strPath, noSpace);

	obs_data_t *settings = obs_data_create();
	if (updateReplayBuffer) {
		string f;

		if (rbPrefix && *rbPrefix) {
			f += rbPrefix;
			if (f.back() != ' ')
				f += " ";
		}

		f += filenameFormat;

		if (rbSuffix && *rbSuffix) {
			if (*rbSuffix != ' ')
				f += " ";
			f += rbSuffix;
		}

		remove_reserved_file_characters(f);

		obs_data_set_string(settings, "directory", path);
		obs_data_set_string(settings, "format", f.c_str());
		obs_data_set_string(settings, "extension", format);
		obs_data_set_int(settings, "max_time_sec", rbTime);
		obs_data_set_int(settings, "max_size_mb",
				usingRecordingPreset ? rbSize : 0);
	} else {
		obs_data_set_string(settings, ffmpegOutput ? "url" : "path",
				strPath.c_str());
	}

	obs_data_set_string(settings, "muxer_settings", mux);

	if (updateReplayBuffer)
		obs_output_update(replayBuffer, settings);
	else
		obs_output_update(fileOutput, settings);

	obs_data_release(settings);
	return true;
}

四停止錄製

開始錄製停止錄製，都是用的同一個UI按鈕

void OBSBasic::on_recordButton_clicked()
{
   if (outputHandler->RecordingActive())
       StopRecording();
   else
       StartRecording();
}

需要注意的是：StopRecording()雖然結束錄製，但此時錄製的視頻文件還沒有完全生成

void OBSBasic::StopRecording()
{
	SaveProject();

	if (outputHandler->RecordingActive())
		outputHandler->StopRecording(recordingStopping);

	OnDeactivate();
}



void AdvancedOutput::StopRecording(bool force)
{
	if (force)
		obs_output_force_stop(fileOutput);
	else
		obs_output_stop(fileOutput);
}


void obs_output_stop(obs_output_t *output)
{
	bool encoded;
	if (!obs_output_valid(output, "obs_output_stop"))
		return;
	if (!output->context.data)
		return;
	if (!active(output) && !reconnecting(output))
		return;
	if (reconnecting(output)) {
		obs_output_force_stop(output);
		return;
	}

	encoded = (output->info.flags & OBS_OUTPUT_ENCODED) != 0;

	if (encoded && output->active_delay_ns) {
		obs_output_delay_stop(output);

	} else if (!stopping(output)) {
		do_output_signal(output, "stopping");
		obs_output_actual_stop(output, false, os_gettime_ns());
	}
}


static inline void do_output_signal(struct obs_output *output,
		const char *signal)
{
	struct calldata params = {0};
	calldata_set_ptr(&params, "output", output);
	signal_handler_signal(output->context.signals, signal, &params);
	calldata_free(&params);
}

相當於發送了一個信號

static const char *output_signals[] = {
   "void start(ptr output)",
   "void stop(ptr output, int code)",
   "void starting(ptr output)",
   "void stopping(ptr output)",
   "void activate(ptr output)",
   "void deactivate(ptr output)",
   "void reconnect(ptr output)",
   "void reconnect_success(ptr output)",
   NULL
};

點擊停止錄製後，按鈕名變爲停止錄製...，實際生成視頻完成時，按鈕再變爲開始錄製

生成完錄製視頻的地方

void OBSBasic::RecordingStop(int code)
{
	ui->statusbar->RecordingStopped();
	ui->recordButton->setText(QTStr("Basic.Main.StartRecording")); //開始錄製   錄製結束 生成錄製視頻後   

	ShowUploadDlg(); //生成錄製視頻完成後，再顯示上傳對話框

	if (sysTrayRecord)
		sysTrayRecord->setText(ui->recordButton->text());

	blog(LOG_INFO, RECORDING_STOP);

	if (code == OBS_OUTPUT_UNSUPPORTED && isVisible()) {
		OBSMessageBox::information(this,
				QTStr("Output.RecordFail.Title"),
				QTStr("Output.RecordFail.Unsupported"));

	} else if (code == OBS_OUTPUT_NO_SPACE && isVisible()) {
		OBSMessageBox::information(this,
				QTStr("Output.RecordNoSpace.Title"),
				QTStr("Output.RecordNoSpace.Msg"));

	} else if (code != OBS_OUTPUT_SUCCESS && isVisible()) {
		OBSMessageBox::information(this,
				QTStr("Output.RecordError.Title"),
				QTStr("Output.RecordError.Msg"));

	} else if (code == OBS_OUTPUT_UNSUPPORTED && !isVisible()) {
		SysTrayNotify(QTStr("Output.RecordFail.Unsupported"),
			QSystemTrayIcon::Warning);

	} else if (code == OBS_OUTPUT_NO_SPACE && !isVisible()) {
		SysTrayNotify(QTStr("Output.RecordNoSpace.Msg"),
			QSystemTrayIcon::Warning);

	} else if (code != OBS_OUTPUT_SUCCESS && !isVisible()) {
		SysTrayNotify(QTStr("Output.RecordError.Msg"),
			QSystemTrayIcon::Warning);
	}

	if (api)
		api->on_event(OBS_FRONTEND_EVENT_RECORDING_STOPPED);

	OnDeactivate();
}

下面分析下發送信號主要過程

static inline void signal_stop(struct obs_output *output)
{
	struct calldata params;

	calldata_init(&params);
	calldata_set_string(&params, "last_error", output->last_error_message);
	calldata_set_int(&params, "code", output->stop_code);
	calldata_set_ptr(&params, "output", output);

	signal_handler_signal(output->context.signals, "stop", &params);

	calldata_free(&params);
}



static void OBSStopRecording(void *data, calldata_t *params)
{
	BasicOutputHandler *output = static_cast<BasicOutputHandler*>(data);
	int code = (int)calldata_int(params, "code");

	output->recordingActive = false;
	QMetaObject::invokeMethod(output->main,
			"RecordingStop", Q_ARG(int, code));  //void OBSBasic::RecordingStop(int code)

	UNUSED_PARAMETER(params);
}

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