Video: Support scaling the output frame

src/platform/ffmpeg/ffmpeg-encoder.c

@@ -29,6 +29,7 @@ void FFmpegEncoderInit(struct FFmpegEncoder* encoder) {
 	FFmpegEncoderSetAudio(encoder, "flac", 0);
 	FFmpegEncoderSetVideo(encoder, "png", 0);
 	FFmpegEncoderSetContainer(encoder, "matroska");
+	FFmpegEncoderSetDimensions(encoder, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS);
 	encoder->resampleContext = 0;
 	encoder->absf = 0;
 	encoder->context = 0;
@@ -143,6 +144,11 @@ bool FFmpegEncoderSetContainer(struct FFmpegEncoder* encoder, const char* contai
 	return true;
 }
 
+void FFmpegEncoderSetDimensions(struct FFmpegEncoder* encoder, int width, int height) {
+	encoder->width = width > 0 ? width : VIDEO_HORIZONTAL_PIXELS;
+	encoder->height = height > 0 ? height : VIDEO_VERTICAL_PIXELS;
+}
+
 bool FFmpegEncoderVerifyContainer(struct FFmpegEncoder* encoder) {
 	AVOutputFormat* oformat = av_guess_format(encoder->containerFormat, 0, 0);
 	AVCodec* acodec = avcodec_find_encoder_by_name(encoder->audioCodec);
@@ -218,8 +224,8 @@ bool FFmpegEncoderOpen(struct FFmpegEncoder* encoder, const char* outfile) {
 	encoder->videoStream = avformat_new_stream(encoder->context, vcodec);
 	encoder->video = encoder->videoStream->codec;
 	encoder->video->bit_rate = encoder->videoBitrate;
-	encoder->video->width = VIDEO_HORIZONTAL_PIXELS;
-	encoder->video->height = VIDEO_VERTICAL_PIXELS;
+	encoder->video->width = encoder->width;
+	encoder->video->height = encoder->height;
 	encoder->video->time_base = (AVRational) { VIDEO_TOTAL_LENGTH, GBA_ARM7TDMI_FREQUENCY };
 	encoder->video->pix_fmt = encoder->pixFormat;
 	encoder->video->gop_size = 15;
@@ -234,8 +240,8 @@ bool FFmpegEncoderOpen(struct FFmpegEncoder* encoder, const char* outfile) {
 	encoder->videoFrame->height = encoder->video->height;
 	encoder->videoFrame->pts = 0;
 	encoder->scaleContext = sws_getContext(VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, AV_PIX_FMT_0BGR32,
-		VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, encoder->video->pix_fmt,
-		0, 0, 0, 0);
+		encoder->videoFrame->width, encoder->videoFrame->height, encoder->video->pix_fmt,
+		SWS_POINT, 0, 0, 0);
 	av_image_alloc(encoder->videoFrame->data, encoder->videoFrame->linesize, encoder->video->width, encoder->video->height, encoder->video->pix_fmt, 32);
 
 	avio_open(&encoder->context->pb, outfile, AVIO_FLAG_WRITE);

src/platform/ffmpeg/ffmpeg-encoder.h

@@ -35,6 +35,8 @@ struct FFmpegEncoder {
 	struct AVCodecContext* video;
 	enum AVPixelFormat pixFormat;
 	struct AVFrame* videoFrame;
+	int width;
+	int height;
 	int64_t currentVideoFrame;
 	struct SwsContext* scaleContext;
 	struct AVStream* videoStream;
@@ -44,6 +46,7 @@ void FFmpegEncoderInit(struct FFmpegEncoder*);
 bool FFmpegEncoderSetAudio(struct FFmpegEncoder*, const char* acodec, unsigned abr);
 bool FFmpegEncoderSetVideo(struct FFmpegEncoder*, const char* vcodec, unsigned vbr);
 bool FFmpegEncoderSetContainer(struct FFmpegEncoder*, const char* container);
+void FFmpegEncoderSetDimensions(struct FFmpegEncoder*, int width, int height);
 bool FFmpegEncoderVerifyContainer(struct FFmpegEncoder*);
 bool FFmpegEncoderOpen(struct FFmpegEncoder*, const char* outfile);
 void FFmpegEncoderClose(struct FFmpegEncoder*);

src/platform/qt/VideoView.cpp

@@ -79,6 +79,9 @@ VideoView::VideoView(QWidget* parent)
 	connect(m_ui.abr, SIGNAL(valueChanged(int)), this, SLOT(setAudioBitrate(int)));
 	connect(m_ui.vbr, SIGNAL(valueChanged(int)), this, SLOT(setVideoBitrate(int)));
 
+	connect(m_ui.width, SIGNAL(valueChanged(int)), this, SLOT(setWidth(int)));
+	connect(m_ui.height, SIGNAL(valueChanged(int)), this, SLOT(setHeight(int)));
+
 	connect(m_ui.showAdvanced, SIGNAL(clicked(bool)), this, SLOT(showAdvanced(bool)));
 
 	FFmpegEncoderInit(&m_encoder);
@@ -107,7 +110,7 @@ VideoView::VideoView(QWidget* parent)
 		.container = "MP4",
 		.vcodec = "h.264",
 		.acodec = "AAC",
-		.vbr = 6000,
+		.vbr = 5000,
 		.abr = 384,
 		.width = 1620,
 		.height = 1080
@@ -144,6 +147,8 @@ VideoView::VideoView(QWidget* parent)
 	setAudioBitrate(m_ui.abr->value());
 	setVideoBitrate(m_ui.vbr->value());
 	setContainer(m_ui.container->currentText());
+	setWidth(m_ui.width->value());
+	setHeight(m_ui.height->value());
 
 	showAdvanced(false);
 }
@@ -246,6 +251,24 @@ void VideoView::setVideoBitrate(int br, bool manual) {
 	}
 }
 
+void VideoView::setWidth(int width, bool manual) {
+	m_width = width;
+	FFmpegEncoderSetDimensions(&m_encoder, m_width, m_height);
+	validateSettings();
+	if (manual) {
+		uncheckIncompatible();
+	}
+}
+
+void VideoView::setHeight(int height, bool manual) {
+	m_height = height;
+	FFmpegEncoderSetDimensions(&m_encoder, m_width, m_height);
+	validateSettings();
+	if (manual) {
+		uncheckIncompatible();
+	}
+}
+
 void VideoView::showAdvanced(bool show) {
 	m_ui.advancedBox->setVisible(show);
 }
@@ -290,7 +313,9 @@ void VideoView::uncheckIncompatible() {
 		.acodec = m_audioCodec,
 		.vcodec = m_videoCodec,
 		.abr = m_abr / 1000,
-		.vbr = m_vbr / 1000
+		.vbr = m_vbr / 1000,
+		.width = m_width,
+		.height = m_height
 	};
 
 	for (auto iterator = m_presets.constBegin(); iterator != m_presets.constEnd(); ++iterator) {
@@ -371,6 +396,14 @@ void VideoView::setPreset(const Preset& preset) {
 		setVideoBitrate(preset.vbr, false);
 		safelySet(m_ui.vbr, preset.vbr);
 	}
+	if (preset.width) {
+		setWidth(preset.width, false);
+		safelySet(m_ui.width, preset.width);
+	}
+	if (preset.height) {
+		setHeight(preset.height, false);
+		safelySet(m_ui.height, preset.height);
+	}
 
 	uncheckIncompatible();
 	validateSettings();

src/platform/qt/VideoView.h

@@ -52,6 +52,9 @@ private slots:
 	void setAudioBitrate(int, bool manual = true);
 	void setVideoBitrate(int, bool manual = true);
 
+	void setWidth(int, bool manual = true);
+	void setHeight(int, bool manual = true);
+
 	void showAdvanced(bool);
 
 	void uncheckIncompatible();
@@ -81,6 +84,9 @@ private:
 	int m_abr;
 	int m_vbr;
 
+	int m_width;
+	int m_height;
+
 	QMap<QAbstractButton*, Preset> m_presets;
 
 	static QMap<QString, QString> s_acodecMap;

src/platform/qt/VideoView.ui

@@ -152,9 +152,6 @@
        <layout class="QVBoxLayout" name="verticalLayout_3">
         <item>
          <widget class="QRadioButton" name="preset1080">
-          <property name="enabled">
-           <bool>false</bool>
-          </property>
           <property name="text">
            <string>1080p</string>
           </property>
@@ -165,9 +162,6 @@
         </item>
         <item>
          <widget class="QRadioButton" name="preset720">
-          <property name="enabled">
-           <bool>false</bool>
-          </property>
           <property name="text">
            <string>720p</string>
           </property>
@@ -178,9 +172,6 @@
         </item>
         <item>
          <widget class="QRadioButton" name="preset480">
-          <property name="enabled">
-           <bool>false</bool>
-          </property>
           <property name="text">
            <string>480p</string>
           </property>
@@ -191,9 +182,6 @@
         </item>
         <item>
          <widget class="QRadioButton" name="preset160">
-          <property name="enabled">
-           <bool>false</bool>
-          </property>
           <property name="text">
            <string>GBA (240x160)</string>
           </property>
@@ -423,9 +411,6 @@
          </item>
          <item row="0" column="3">
           <widget class="QSpinBox" name="height">
-           <property name="enabled">
-            <bool>false</bool>
-           </property>
            <property name="minimum">
             <number>160</number>
            </property>
@@ -436,9 +421,6 @@
          </item>
          <item row="0" column="1">
           <widget class="QSpinBox" name="width">
-           <property name="enabled">
-            <bool>false</bool>
-           </property>
            <property name="minimum">
             <number>240</number>
            </property>