攝像頭是我們比較常用的外設,很多場景我們都會用到攝像頭。比如視頻直播、視頻監控等各個領域都會用到攝像頭。攝像頭圖像數據的獲取,方法有很多,比如可以使用Qt自帶的API獲取,也可以使用DirectShow、OpenCV、FFMpeg提供的API方式獲取(本質上是通過DirectShow)。本篇文章主要講述使用FFMpeg API獲取攝像頭的數據信息。
下面是一個簡單的攝像頭顯示的例子的實現效果:
使用FFMpeg獲取攝像頭的圖像數據基本分爲如下步驟:
- 使用 av_register_all(); 和 avdevice_register_all(); 中註冊全部和設備。
- 獲取攝像頭相關信息
- 打開攝像頭
- 獲取攝像頭數據並渲染顯示
1. 獲取攝像頭的信息
首先要獲取當前設備的攝像頭列表。主要是攝像頭的名稱,這裏我們使用Qt的API獲取。方法如下:
// 獲取可用攝像頭列表
QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
foreach (const QCameraInfo &cameraInfo, cameras)
{
// 獲取攝像頭的名稱
QString cameraName = cameraInfo.description();
// 添加到ComboBox中
m_pComboBox->addItem(cameraName);
}
如果想要查看攝像頭的具體信息,可以使用FFMpeg命令:
ffmpeg -list_options true -f dshow -i video="BisonCam, NB Pro"
我這裏攝像頭的名稱爲 BisonCam, NB Pro 。
得到的結果如下:
2. 打開並初始化攝像頭
這裏直接貼了代碼
// 打開攝像頭
bool CameraCapture::open(const QString& deviceName)
{
m_avFrame = av_frame_alloc();
AVInputFormat *inputFormat = av_find_input_format("dshow");
AVDictionary *format_opts = nullptr;
//av_dict_set_int(&format_opts, "rtbufsize", 3041280 * 10, 0);
av_dict_set(&format_opts, "avioflags", "direct", 0);
av_dict_set(&format_opts, "video_size", "1280x720", 0);
av_dict_set(&format_opts, "framerate", "30", 0);
av_dict_set(&format_opts, "vcodec", "mjpeg", 0);
m_pFormatContent = avformat_alloc_context();
QString urlString = QString("video=") + deviceName;
// 打開輸入
int result = avformat_open_input(&m_pFormatContent, urlString.toLocal8Bit().data(), inputFormat, &format_opts);
if (result < 0)
{
qDebug() << "AVFormat Open Input Error!";
return false;
}
result = avformat_find_stream_info(m_pFormatContent, nullptr);
if (result < 0)
{
qDebug() << "AVFormat Find Stream Info Error!";
return false;
}
// find Video Stream Index
int count = m_pFormatContent->nb_streams;
for (int i=0; i<count; ++i)
{
if (m_pFormatContent->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
m_nVideoStreamIndex = i;
break;
}
}
if (m_nVideoStreamIndex < 0)
return false;
// 查找解碼器
m_pCaptureContext = m_pFormatContent->streams[m_nVideoStreamIndex]->codec;
AVCodec* codec = avcodec_find_decoder(m_pCaptureContext->codec_id);
if (codec == nullptr)
return false;
// 打開解碼器
if (avcodec_open2(m_pCaptureContext, codec, nullptr) != 0)
return false;
// 設置尺寸、格式等信息
m_pCameraData.m_nWidth = m_pCaptureContext->width;
m_pCameraData.m_nHeight = m_pCaptureContext->height;
AVPixelFormat format = m_pCaptureContext->pix_fmt;
format = convertDeprecatedFormat(format);
if (m_isUsedSwsScale)
return true;
m_isUsedSwsScale = false;
if (format == AV_PIX_FMT_YUV420P)
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_YUV420P;
else if (format == AV_PIX_FMT_YUV422P)
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_YUV422P;
else if (format == AV_PIX_FMT_YUV444P)
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_YUV444P;
else {
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_RGB24;
m_isUsedSwsScale = true;
}
return true;
}
這裏需要注意的有下面幾點:
- 打開攝像頭之前,可以配置一些攝像頭配置的參數,比如分辨率、幀率等信息。
- 在打開的URL中,一定要使用如下格式 video=你的攝像頭名字 。否則,則會打開失敗。
- 打開攝像頭之後的操作,就是FFMpeg的常規操作了,跟打開視頻文件、打開音頻文件的使用方法差不多,這裏就不作過多的說明了。感興趣的可以閱讀我的這篇文章:使用FFMpeg 解碼音頻文件 。
3. 獲取攝像頭數據及渲染
這裏我就直接貼出代碼了
// 獲取一幀數據
bool CameraCapture::capture(void)
{
AVPacket pkt;
// 獲取一幀數據
int result = av_read_frame(m_pFormatContent, &pkt);
if (result)
return false;
if (pkt.stream_index != m_nVideoStreamIndex)
{
av_packet_unref(&pkt);
return false;
}
// 解碼視頻數據
result = avcodec_send_packet(m_pCaptureContext, &pkt);
if (result)
{
av_packet_unref(&pkt);
return false;
}
result = avcodec_receive_frame(m_pCaptureContext, m_avFrame);
if (result)
{
av_packet_unref(&pkt);
return false;
}
// 轉換成RGB24
if (m_isUsedSwsScale)
{
// 設置RGBFrame
if (m_pRGBFrame == nullptr)
{
m_pRGBFrame = av_frame_alloc();
m_pRGBFrame->width = m_avFrame->width;
m_pRGBFrame->height = m_avFrame->height;
m_pRGBFrame->linesize[0] = m_pRGBFrame->width * m_pRGBFrame->height * 3;
av_image_alloc(m_pRGBFrame->data, m_pRGBFrame->linesize,
m_pRGBFrame->width, m_pRGBFrame->height, AV_PIX_FMT_RGB24, 1);
}
// 轉化爲RGB24
frameToRgbImage(m_pRGBFrame, m_avFrame);
// 設置數據
m_pMutex.lock();
m_pCameraData.m_cameraData.clear();
m_pCameraData.m_cameraData.append((char*)m_pRGBFrame->data[0], \
m_pRGBFrame->width * m_pRGBFrame->height * 3);
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_RGB24;
m_pMutex.unlock();
}
else
{
disposeYUVData();
}
av_packet_unref(&pkt);
return true;
}
- 使用函數 av_read_frame 獲取一幀數據。
- 使用 avcodec_send_packet 和 avcodec_receive_frame 解碼這一幀視頻數據。
- 獲取 AVFrame 數據並處理, AVFrame 就是解碼後的這幀圖像數據。
關於渲染
AVFrame 中的數據,它可能是 RGB24 類型的,也可能是 YUV 類型的。 AVFrame中的 format 記錄這圖像的數據格式。 我這裏根據數據的類型,分別做了處理。如果是YUV的數據,使用 OepnGL 渲染YUV的數據,其他類類型的數據, 使用 SWS 方法轉成RGB的數據顯示。(使用GPU解碼YUV並渲染,效率會更高一下),當然也可以使用SDL渲染。
SWS 使用也很簡單:
void CameraCapture::frameToRgbImage(AVFrame* pDest, AVFrame* frame)
{
// 創建SWS上下文
if (m_pSwsContext == nullptr)
{
m_pSwsContext = sws_getContext(frame->width, frame->height, convertDeprecatedFormat((AVPixelFormat)(frame->format)), \
frame->width, frame->height, AV_PIX_FMT_RGB24, \
SWS_BILINEAR, nullptr, nullptr, nullptr);
}
//avpicture_fill( )
sws_scale(m_pSwsContext, frame->data, frame->linesize, 0, frame->height, \
pDest->data, pDest->linesize);
}
對於YUV的數據,處理存在 lineSize 中的大小比實際的數據大的情況,也就是說如果分辨率爲 1280*720,實際存儲的數據可能會比這個偏大(每一行都會多出一部分數據)。lineSize 表示每一行的大小,一共有 Height 個行。這裏貼出我處理的代碼:
void CameraCapture::disposeYUVData(void)
{
QMutexLocker locker(&m_pMutex);
m_pCameraData.m_cameraData.clear();
AVPixelFormat pixFormat = convertDeprecatedFormat((AVPixelFormat)m_avFrame->format);
// 設置Y的數據
if (m_avFrame->linesize[0] == m_avFrame->width)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[0], \
m_avFrame->linesize[0] * m_avFrame->height);
}
else
{
for (int i=0; i<m_avFrame->height; ++i)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[0], m_avFrame->width);
}
}
// 設置U的數據
int uDataWidth = m_avFrame->width;
int uDataHeight = m_avFrame->height;
if (pixFormat == AV_PIX_FMT_YUV420P)
{
uDataWidth = uDataWidth / 2;
uDataHeight = uDataHeight / 2;
}
else if (pixFormat == AV_PIX_FMT_YUV422P)
uDataWidth = uDataWidth / 2;
if (m_avFrame->linesize[1] == uDataWidth)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[1], \
m_avFrame->linesize[1] * uDataHeight);
}
else
{
for (int i=0; i<uDataHeight; ++i)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[1], uDataWidth);
}
}
// 設置V的數據
int vDataWidth = uDataWidth;
int vDataHeight = uDataHeight;
if (m_avFrame->linesize[1] == vDataWidth)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[2], \
m_avFrame->linesize[2] * vDataHeight);
}
else
{
for (int i=0; i<vDataHeight; ++i)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[2], vDataWidth);
}
}
}
data[0] 和 linesize[0] 表示Y分量的數據和一行數據的大小
data[1] 和 linesize[1] 表示U分量的數據和一行數據的大小
data[2] 和 linesize[U2] 表示V分量的數據和一行數據的大小
函數 convertDeprecatedFormat 是一個格式轉換的函數,目的是有些被廢棄的格式得到轉換,比如說 AV_PIX_FMT_YUVJ420P 和 AV_PIX_FMT_YUV420P 實際上是一樣的。
實現代碼如下:
AVPixelFormat CameraCapture::convertDeprecatedFormat(enum AVPixelFormat format)
{
switch (format)
{
case AV_PIX_FMT_YUVJ420P:
return AV_PIX_FMT_YUV420P;
case AV_PIX_FMT_YUVJ422P:
return AV_PIX_FMT_YUV422P;
case AV_PIX_FMT_YUVJ444P:
return AV_PIX_FMT_YUV444P;
case AV_PIX_FMT_YUVJ440P:
return AV_PIX_FMT_YUV440P;
default:
return format;
}
}
完整代碼:
頭文件 CameraCapture.h
#ifndef CAMERACAPTURE_H
#define CAMERACAPTURE_H
#include <QObject>
#include <atomic>
#include <QMutex>
#include <QMutexLocker>
#include "audiovideocore_global.h"
extern "C"
{
#include <libavdevice/avdevice.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavutil/imgutils.h>
#include <libavutil/parseutils.h>
}
class CameraCapture;
class AUDIOVIDEOCORESHARED_EXPORT CameraData
{
public:
enum PixelFormat
{
PIXFORMAT_YUV420P,
PIXFORMAT_YUV422P,
PIXFORMAT_YUV444P,
PIXFORMAT_RGB24
};
public:
CameraData(QMutex *mutex)
:m_pMutex(mutex){
//qRegisterMetaType<CameraData>("CameraData");
}
~CameraData(){}
int getWidth(void) const {return m_nWidth;}
int getHeight(void) const {return m_nHeight;}
QByteArray getCameraData(void) {
QMutexLocker locker(m_pMutex);
return m_cameraData;
}
PixelFormat getPixelFormat(void) const {return m_pixelFormat;}
friend class CameraCapture;
private:
QByteArray m_cameraData;
std::atomic<int> m_nWidth;
std::atomic<int> m_nHeight;
PixelFormat m_pixelFormat;
QMutex* m_pMutex = nullptr;
};
class CameraCapture : public QObject
{
public:
CameraCapture(QObject* parent = nullptr);
virtual ~CameraCapture();
// 打開攝像頭
bool open(const QString& deviceName);
// 關閉攝像頭
void close(void);
// 獲取一幀數據
bool capture(void);
// 是否使用SWS轉化爲RGB格式
void setUsedSwsScaleEnabled(bool isEnabled);
// 獲取數據
const CameraData& getCameraData(void) {return m_pCameraData;}
private:
AVFrame* m_avFrame = nullptr;
AVFrame* m_pRGBFrame = nullptr;
int m_nVideoStreamIndex = -1;
AVFormatContext* m_pFormatContent = nullptr;
AVCodecContext* m_pCaptureContext = nullptr;
SwsContext* m_pSwsContext = nullptr;
CameraData m_pCameraData;
AVPixelFormat m_pixelFormat;
QMutex m_pMutex;
bool m_isUsedSwsScale = false;
void frameToRgbImage(AVFrame* pDest, AVFrame* frame);
AVPixelFormat convertDeprecatedFormat(enum AVPixelFormat format);
// 處理YUV數據組合成一個Buffer
void disposeYUVData(void);
};
#endif
源文件 CameraCapture.cpp
#include "CameraCapture.h"
#include <QDebug>
CameraCapture::CameraCapture(QObject* parent)
:QObject(parent),
m_pCameraData(&m_pMutex)
{
av_register_all();
avdevice_register_all();
}
CameraCapture::~CameraCapture()
{
}
// 打開攝像頭
bool CameraCapture::open(const QString& deviceName)
{
m_avFrame = av_frame_alloc();
AVInputFormat *inputFormat = av_find_input_format("dshow");
AVDictionary *format_opts = nullptr;
//av_dict_set_int(&format_opts, "rtbufsize", 3041280 * 10, 0);
av_dict_set(&format_opts, "avioflags", "direct", 0);
av_dict_set(&format_opts, "video_size", "1280x720", 0);
av_dict_set(&format_opts, "framerate", "30", 0);
av_dict_set(&format_opts, "vcodec", "mjpeg", 0);
m_pFormatContent = avformat_alloc_context();
QString urlString = QString("video=") + deviceName;
// 打開輸入
int result = avformat_open_input(&m_pFormatContent, urlString.toLocal8Bit().data(), inputFormat, &format_opts);
if (result < 0)
{
qDebug() << "AVFormat Open Input Error!";
return false;
}
result = avformat_find_stream_info(m_pFormatContent, nullptr);
if (result < 0)
{
qDebug() << "AVFormat Find Stream Info Error!";
return false;
}
// find Video Stream Index
int count = m_pFormatContent->nb_streams;
for (int i=0; i<count; ++i)
{
if (m_pFormatContent->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
m_nVideoStreamIndex = i;
break;
}
}
if (m_nVideoStreamIndex < 0)
return false;
// 查找解碼器
m_pCaptureContext = m_pFormatContent->streams[m_nVideoStreamIndex]->codec;
AVCodec* codec = avcodec_find_decoder(m_pCaptureContext->codec_id);
if (codec == nullptr)
return false;
// 打開解碼器
if (avcodec_open2(m_pCaptureContext, codec, nullptr) != 0)
return false;
// 設置尺寸、格式等信息
m_pCameraData.m_nWidth = m_pCaptureContext->width;
m_pCameraData.m_nHeight = m_pCaptureContext->height;
AVPixelFormat format = m_pCaptureContext->pix_fmt;
format = convertDeprecatedFormat(format);
if (m_isUsedSwsScale)
return true;
m_isUsedSwsScale = false;
if (format == AV_PIX_FMT_YUV420P)
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_YUV420P;
else if (format == AV_PIX_FMT_YUV422P)
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_YUV422P;
else if (format == AV_PIX_FMT_YUV444P)
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_YUV444P;
else {
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_RGB24;
m_isUsedSwsScale = true;
}
return true;
}
// 關閉攝像頭
void CameraCapture::close(void)
{
sws_freeContext(m_pSwsContext);
av_frame_free(&m_avFrame);
av_frame_free(&m_pRGBFrame);
m_pRGBFrame = nullptr;
m_avFrame = nullptr;
avcodec_close(m_pCaptureContext);
avformat_close_input(&m_pFormatContent);
}
void CameraCapture::setUsedSwsScaleEnabled(bool isEnabled)
{
m_isUsedSwsScale = isEnabled;
}
void CameraCapture::frameToRgbImage(AVFrame* pDest, AVFrame* frame)
{
// 創建SWS上下文
if (m_pSwsContext == nullptr)
{
m_pSwsContext = sws_getContext(frame->width, frame->height, convertDeprecatedFormat((AVPixelFormat)(frame->format)), \
frame->width, frame->height, AV_PIX_FMT_RGB24, \
SWS_BILINEAR, nullptr, nullptr, nullptr);
}
//avpicture_fill( )
sws_scale(m_pSwsContext, frame->data, frame->linesize, 0, frame->height, \
pDest->data, pDest->linesize);
}
AVPixelFormat CameraCapture::convertDeprecatedFormat(enum AVPixelFormat format)
{
switch (format)
{
case AV_PIX_FMT_YUVJ420P:
return AV_PIX_FMT_YUV420P;
case AV_PIX_FMT_YUVJ422P:
return AV_PIX_FMT_YUV422P;
case AV_PIX_FMT_YUVJ444P:
return AV_PIX_FMT_YUV444P;
case AV_PIX_FMT_YUVJ440P:
return AV_PIX_FMT_YUV440P;
default:
return format;
}
}
void CameraCapture::disposeYUVData(void)
{
QMutexLocker locker(&m_pMutex);
m_pCameraData.m_cameraData.clear();
AVPixelFormat pixFormat = convertDeprecatedFormat((AVPixelFormat)m_avFrame->format);
// 設置Y的數據
if (m_avFrame->linesize[0] == m_avFrame->width)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[0], \
m_avFrame->linesize[0] * m_avFrame->height);
}
else
{
for (int i=0; i<m_avFrame->height; ++i)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[0], m_avFrame->width);
}
}
// 設置U的數據
int uDataWidth = m_avFrame->width;
int uDataHeight = m_avFrame->height;
if (pixFormat == AV_PIX_FMT_YUV420P)
{
uDataWidth = uDataWidth / 2;
uDataHeight = uDataHeight / 2;
}
else if (pixFormat == AV_PIX_FMT_YUV422P)
uDataWidth = uDataWidth / 2;
if (m_avFrame->linesize[1] == uDataWidth)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[1], \
m_avFrame->linesize[1] * uDataHeight);
}
else
{
for (int i=0; i<uDataHeight; ++i)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[1], uDataWidth);
}
}
// 設置V的數據
int vDataWidth = uDataWidth;
int vDataHeight = uDataHeight;
if (m_avFrame->linesize[1] == vDataWidth)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[2], \
m_avFrame->linesize[2] * vDataHeight);
}
else
{
for (int i=0; i<vDataHeight; ++i)
{
m_pCameraData.m_cameraData.append((char*)m_avFrame->data[2], vDataWidth);
}
}
}
// 獲取一幀數據
bool CameraCapture::capture(void)
{
AVPacket pkt;
// 獲取一幀數據
int result = av_read_frame(m_pFormatContent, &pkt);
if (result)
return false;
if (pkt.stream_index != m_nVideoStreamIndex)
{
av_packet_unref(&pkt);
return false;
}
// 解碼視頻數據
result = avcodec_send_packet(m_pCaptureContext, &pkt);
if (result)
{
av_packet_unref(&pkt);
return false;
}
result = avcodec_receive_frame(m_pCaptureContext, m_avFrame);
if (result)
{
av_packet_unref(&pkt);
return false;
}
// 轉換成RGB24
if (m_isUsedSwsScale)
{
// 設置RGBFrame
if (m_pRGBFrame == nullptr)
{
m_pRGBFrame = av_frame_alloc();
m_pRGBFrame->width = m_avFrame->width;
m_pRGBFrame->height = m_avFrame->height;
m_pRGBFrame->linesize[0] = m_pRGBFrame->width * m_pRGBFrame->height * 3;
av_image_alloc(m_pRGBFrame->data, m_pRGBFrame->linesize,
m_pRGBFrame->width, m_pRGBFrame->height, AV_PIX_FMT_RGB24, 1);
}
// 轉化爲RGB24
frameToRgbImage(m_pRGBFrame, m_avFrame);
// 設置數據
m_pMutex.lock();
m_pCameraData.m_cameraData.clear();
m_pCameraData.m_cameraData.append((char*)m_pRGBFrame->data[0], \
m_pRGBFrame->width * m_pRGBFrame->height * 3);
m_pCameraData.m_pixelFormat = CameraData::PIXFORMAT_RGB24;
m_pMutex.unlock();
}
else
{
disposeYUVData();
}
av_packet_unref(&pkt);
return true;
}
線程中,調用部分:
頭文件 CameraCaptureThread.h
#ifndef CAMERACAPTURETHREAD_H
#define CAMERACAPTURETHREAD_H
#include <QThread>
#include "CameraCapture.h"
#include "audiovideocore_global.h"
class AUDIOVIDEOCORESHARED_EXPORT CameraCaptureThread : public QThread
{
Q_OBJECT
public:
CameraCaptureThread(QObject* parent = nullptr);
virtual ~CameraCaptureThread();
void run(void) override;
// 打開攝像頭
bool openCamera(const QString& cameraName);
// 關閉攝像頭
void closeCamera(void);
// 是否使用SWS轉化爲RGB格式
void setUsedSwsScaleEnabled(bool isEnabled){
m_pCameraCapture->setUsedSwsScaleEnabled(isEnabled);
}
// 獲取數據
const CameraData& getCameraData(void) {return m_pCameraCapture->getCameraData();}
private:
CameraCapture* m_pCameraCapture = nullptr;
signals:
void needUpdate();
};
#endif
cpp文件 CameraCaptureThread.cpp
#include "CameraCaptureThread.h"
CameraCaptureThread::CameraCaptureThread(QObject* parent)
:QThread(parent)
{
m_pCameraCapture = new CameraCapture(this);
}
CameraCaptureThread::~CameraCaptureThread()
{
closeCamera();
}
void CameraCaptureThread::run(void)
{
while (!this->isInterruptionRequested())
{
// 獲取攝像頭數據
m_pCameraCapture->capture();
// 同步通知顯示
emit needUpdate();
}
}
bool CameraCaptureThread::openCamera(const QString& cameraName)
{
bool isOpened = m_pCameraCapture->open(cameraName);
if (isOpened)
this->start();
return isOpened;
}
void CameraCaptureThread::closeCamera(void)
{
if (this->isRunning())
{
this->requestInterruption();
this->wait();
m_pCameraCapture->close();
}
}
如果想打開攝像頭 直接使用函數 openCamera 打開攝像頭就可以了,關聯信號 needUpdate 刷界面顯示即可。
我這裏關聯的槽函數
void Widget::onNeedUpdate(void)
{
const CameraData& cameraData = m_pCameraCaptureControl->getCameraData();
CameraData& tempCameraData = (CameraData&)cameraData;
QByteArray byteArray = tempCameraData.getCameraData();
int width = cameraData.getWidth();
int height = cameraData.getHeight();
// 設置YUV的數據
uchar* pData[4] = {0};
pData[0] = (uchar*)byteArray.constData();
pData[1] = (uchar*)byteArray.constData() + width * height;
pData[2] = (uchar*)byteArray.constData() + width * height + width / 2 * height;
// 渲染YUV數據
m_pImageViewer->setYUVData(pData, width, height);
}
關於使用OpenGL渲染YUV數據,後面的文章會做相關的講解。