QT在Android设备上实现FFMPEG开发: 完成拍照、MP4视频录制、rtsp推流
一、系统环境介绍
PC环境: ubuntu18.04
Android版本: 8.1
Android设备: 友善之臂 RK3399 开发板
摄像头: 罗技USB摄像头
FFMPEG版本: 4.2.2
NDK版本: R19C
QT版本: 5.12
二、QT代码
关于FFMPEG库的编译、QT的环境搭建等问题，可以看上几篇文章。
代码说明:
目前代码没有整理，视频录制、拍照、推流等功能都是放在一个.cpp文件里。
代码里暂时没有加多线程，3个功能通过界面上的3个按钮实现调用。
录制视频时，因为没加多线程代码，录制视频的时间在代码里写死了，录制过程中GUI界面是没法响应的。
推流视频同上。
直接上QT的核心代码：整个mainwindow.cpp代码
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include
#include
/*
* 设置QT界面的样式
*/
void MainWindow::SetStyle(const QString &qssFile)
{
QFile file(qssFile);
if (file.open(QFile::ReadOnly)) {
QString qss = QLatin1String(file.readAll());
qApp->setStyleSheet(qss);
QString PaletteColor = qss.mid(20,7);
qApp->setPalette(QPalette(QColor(PaletteColor)));
file.close();
}
else
{
qApp->setStyleSheet("");
}
}
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
this->SetStyle(":/images/blue.css" ); //设置样式表
this->setWindowIcon(QIcon(":/images/log.ico")); //设置图标
this->setWindowTitle("FFMPEG测试DEMO");
RefreshCameraList(); //刷新摄像头列表
//查看摄像头的权限
QProcess process;
QByteArray output;
QString str_output;
process.setProcessChannelMode(QProcess::MergedChannels);
process.start("ls /dev/video0 -l");
process.waitForFinished();
output = process.readAllStandardOutput();
str_output = output;
log_Display(str_output);
}
//日志显示
void MainWindow::log_Display(QString text)
{
ui->plainTextEdit_CameraOpenInfo->insertPlainText(text);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::get_ffmpeg_version_info()
{
QProcess process;
process.start("pwd");
process.waitForFinished();
QByteArray output = process.readAllStandardOutput();
QString str_output = output;
log_Display("当前APP的工作路径:"+str_output);
log_Display(tr("FFMPEG的版本号:%1\n").arg(av_version_info()));
av_register_all();
AVCodec *c_temp = av_codec_next(nullptr);
QString info="FFMPEG支持的解码器:\n";
while (c_temp != nullptr)
{
if (c_temp->decode != nullptr)
{
info+="[Decode]";
}
else
{
info+="[Encode]";
}
switch (c_temp->type)
{
case AVMEDIA_TYPE_VIDEO:
info+="[Video]";
break;
case AVMEDIA_TYPE_AUDIO:
info+="[Audeo]";
break;
default:
info+="[Other]";
break;
}
info+=c_temp->name;
info+=tr(" ID=%1").arg(c_temp->id);
info+="\n";
c_temp = c_temp->next;
}
log_Display(info);
}
#define STREAM_DURATION 10.0 /*录制视频的持续时间 秒*/
#define STREAM_FRAME_RATE 10 /* images/s 这里可以根据摄像头的采集速度来设置帧率 */
#define STREAM_PIX_FMT AV_PIX_FMT_YUV420P /* default pix_fmt */
#define SCALE_FLAGS SWS_BICUBIC
//存放视频的宽度和高度
int video_width;
int video_height;
// 单个输出AVStream的包装器
typedef struct OutputStream
{
AVStream *st;
AVCodecContext *enc;
/*下一帧的点数*/
int64_t next_pts;
int samples_count;
AVFrame *frame;
AVFrame *tmp_frame;
float t, tincr, tincr2;
struct SwsContext *sws_ctx;
struct SwrContext *swr_ctx;
}OutputStream;
typedef struct IntputDev
{
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVFormatContext *v_ifmtCtx;
int videoindex;
struct SwsContext *img_convert_ctx;
AVPacket *in_packet;
AVFrame *pFrame,*pFrameYUV;
}IntputDev;
static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)
{
AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;
printf("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n",
av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
pkt->stream_index);
}
static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt)
{
/* 将输出数据包时间戳值从编解码器重新调整为流时基 */
av_packet_rescale_ts(pkt, *time_base, st->time_base);
pkt->stream_index = st->index;
/*将压缩的帧写入媒体文件。*/
log_packet(fmt_ctx, pkt);
return av_interleaved_write_frame(fmt_ctx, pkt);
}
/*添加输出流。 */
static void add_stream(OutputStream *ost, AVFormatContext *oc,AVCodec **codec,enum AVCodecID codec_id)
{
AVCodecContext *c;
int i;
/* find the encoder */
*codec = avcodec_find_encoder(codec_id);
if (!(*codec))
{
qDebug("Could not find encoder for '%s'\n",
avcodec_get_name(codec_id));
return;
}
ost->st = avformat_new_stream(oc, NULL);
if (!ost->st) {
qDebug("Could not allocate stream\n");
return;
}
ost->st->id = oc->nb_streams-1;
c = avcodec_alloc_context3(*codec);
if (!c) {
qDebug("Could not alloc an encoding context\n");
return;
}
ost->enc = c;
switch((*codec)->type)
{
case AVMEDIA_TYPE_AUDIO:
c->sample_fmt = (*codec)->sample_fmts ?
(*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
c->bit_rate = 64000;
c->sample_rate = 44100;
if ((*codec)->supported_samplerates) {
c->sample_rate = (*codec)->supported_samplerates[0];
for (i = 0; (*codec)->supported_samplerates[i]; i++) {
if ((*codec)->supported_samplerates[i] == 44100)
c->sample_rate = 44100;
}
}
c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
c->channel_layout = AV_CH_LAYOUT_STEREO;
if ((*codec)->channel_layouts) {
c->channel_layout = (*codec)->channel_layouts[0];
for (i = 0; (*codec)->channel_layouts[i]; i++) {
if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO)
c->channel_layout = AV_CH_LAYOUT_STEREO;
}
}
c->channels = av_get_channel_layout_nb_channels(c->channel_layout);
ost->st->time_base = (AVRational){ 1, c->sample_rate };
break;
case AVMEDIA_TYPE_VIDEO:
c->codec_id = codec_id;
c->bit_rate = 2500000; //平均比特率,例子代码默认值是400000
/* 分辨率必须是2的倍数。*/
c->width=video_width;
c->height=video_height;
/*时基：这是基本的时间单位（以秒为单位）
*表示其中的帧时间戳。 对于固定fps内容，
*时基应为1 /framerate，时间戳增量应为
*等于1。*/
ost->st->time_base = (AVRational){1,STREAM_FRAME_RATE}; //帧率设置
c->time_base = ost->st->time_base;
c->gop_size = 12; /* 最多每十二帧发射一帧内帧 */
c->pix_fmt = STREAM_PIX_FMT;
if(c->codec_id == AV_CODEC_ID_MPEG2VIDEO)
{
/* 只是为了测试，我们还添加了B帧 */
c->max_b_frames = 2;
}
if(c->codec_id == AV_CODEC_ID_MPEG1VIDEO)
{
/*需要避免使用其中一些系数溢出的宏块。
*普通视频不会发生这种情况，因为
*色度平面的运动与亮度平面不匹配。 */
c->mb_decision = 2;
}
break;
default:
break;
}
/* 某些格式希望流头分开。 */
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
{
AVFrame *picture;
int ret;
picture = av_frame_alloc();
if (!picture)
return nullptr;
picture->format = pix_fmt;
picture->width = width;
picture->height = height;
/* 为帧数据分配缓冲区 */
ret = av_frame_get_buffer(picture, 32);
if(ret<0)
{
qDebug("Could not allocate frame data.\n");
return nullptr;
}
return picture;
}
static void open_video(AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg)
{
int ret;
AVCodecContext *c = ost->enc;
AVDictionary *opt = nullptr;
av_dict_copy(&opt, opt_arg, 0);
/* open the codec */
ret = avcodec_open2(c, codec, &opt);
av_dict_free(&opt);
if (ret < 0)
{
qDebug("Could not open video codec: %s\n", av_err2str(ret));
return;
}
/* 分配并初始化可重用框架 */
ost->frame = alloc_picture(c->pix_fmt, c->width, c->height);
if (!ost->frame)
{
qDebug("Could not allocate video frame\n");
return;
}
qDebug("ost->frame alloc success fmt=%d w=%d h=%d\n",c->pix_fmt,c->width, c->height);
/*如果输出格式不是YUV420P，则为临时YUV420P
*也需要图片。 然后将其转换为所需的
*输出格式。 */
ost->tmp_frame = nullptr;
if(c->pix_fmt != AV_PIX_FMT_YUV420P)
{
ost->tmp_frame = alloc_picture(AV_PIX_FMT_YUV420P, c->width, c->height);
if (!ost->tmp_frame)
{
qDebug("Could not allocate temporary picture\n");
exit(1);
}
}
/* 将流参数复制到多路复用器*/
ret=avcodec_parameters_from_context(ost->st->codecpar, c);
if(ret<0)
{
qDebug("Could not copy the stream parameters\n");
exit(1);
}
}
/*
*编码一个视频帧
*编码完成后返回1，否则返回0
*/
static int write_video_frame(AVFormatContext *oc, OutputStream *ost,AVFrame *frame)
{
int ret;
AVCodecContext *c;
int got_packet=0;
AVPacket pkt={0};
if(frame==nullptr)
return 1;
c = ost->enc;
av_init_packet(&pkt);
/* 编码图像*/
ret = avcodec_encode_video2(c, &pkt, frame, &got_packet);
if(ret<0)
{
qDebug("Error encoding video frame: %s\n", av_err2str(ret));
return 1;
}
qDebug("--------------video- pkt.pts=%s\n",av_ts2str(pkt.pts));
qDebug("----st.num=%d st.den=%d codec.num=%d codec.den=%d---------\n",ost->st->time_base.num,ost->st->time_base.den,
c->time_base.num,c->time_base.den);
if(got_packet)
{
ret = write_frame(oc, &c->time_base, ost->st, &pkt);
}else
{
ret = 0;
}
if(ret<0)
{
qDebug("Error while writing video frame: %s\n", av_err2str(ret));
return 1;
}
return (frame || got_packet) ? 0 : 1;
}
static AVFrame *get_video_frame(OutputStream *ost,IntputDev* input,int *got_pic)
{
int ret, got_picture;
AVCodecContext *c = ost->enc;
AVFrame * ret_frame=nullptr;
if(av_compare_ts(ost->next_pts, c->time_base,STREAM_DURATION, (AVRational){1,1})>=0)
return nullptr;
/*当我们将帧传递给编码器时，它可能会保留对它的引用
*内部,确保我们在这里不覆盖它*/
if(av_frame_make_writable(ost->frame)<0)
return nullptr;
if(av_read_frame(input->v_ifmtCtx, input->in_packet)>=0)
{
if(input->in_packet->stream_index==input->videoindex)
{
ret = avcodec_decode_video2(input->pCodecCtx, input->pFrame, &got_picture, input->in_packet);
*got_pic=got_picture;
if(ret<0)
{
qDebug("Decode Error.\n");
av_packet_unref(input->in_packet);
return nullptr;
}
if(got_picture)
{
sws_scale(input->img_convert_ctx, (const unsigned char* const*)input->pFrame->data, input->pFrame->linesize, 0, input->pCodecCtx->height, ost->frame->data, ost->frame->linesize);
ost->frame->pts =ost->next_pts++;
ret_frame= ost->frame;
}
}
av_packet_unref(input->in_packet);
}
return ret_frame;
}
static void close_stream(AVFormatContext *oc, OutputStream *ost)
{
avcodec_free_context(&ost->enc);
av_frame_free(&ost->frame);
av_frame_free(&ost->tmp_frame);
sws_freeContext(ost->sws_ctx);
swr_free(&ost->swr_ctx);
}
int MainWindow::FFMPEG_SaveVideo()
{
OutputStream video_st = { 0 }, audio_st = {0};
AVOutputFormat *fmt;
AVFormatContext *oc;
AVCodec *audio_codec, *video_codec;
int ret;
int have_video = 0, have_audio = 0;
int encode_video = 0, encode_audio = 0;
AVDictionary *opt = NULL;
int i;
/*1. FFMPEG初始化*/
av_register_all();
avcodec_register_all();
avdevice_register_all(); //注册多媒体设备交互的类库
QDateTime dateTime(QDateTime::currentDateTime());
//时间效果: 2020-03-05 16:25::04 周四
QString qStr="/sdcard/Movies/"; //手机上存放电影的目录
qStr+=dateTime.toString("yyyy-MM-dd-hh-mm-ss");
qStr+=".mp4";
char filename[50];
strcpy(filename,qStr.toLatin1().data());
// filename=qStr.toLatin1().data(); //"/sdcard/DCIM/Camera/20200309104704.mp4"; //qStr.toLatin1().data();
qDebug()<<"qStr.toLatin1().data()="<nb_streams; i++)
if(v_ifmtCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
{
videoindex=i;
log_Display(tr("videoindex=%1\n").arg(videoindex));
break;
}
if(videoindex==-1)
{
log_Display("找不到视频流。\n");
return -1;
}
pCodecCtx=v_ifmtCtx->streams[videoindex]->codec;
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==nullptr)
{
log_Display("找不到编解码器。\n");
return -1;
}
if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
{
log_Display("无法打开编解码器。\n");
return -1;
}
AVFrame *pFrame,*pFrameYUV;
pFrame=av_frame_alloc();
pFrameYUV=av_frame_alloc();
unsigned char *out_buffer=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16));
av_image_fill_arrays(pFrameYUV->data,pFrameYUV->linesize, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16);
log_Display(tr("摄像头尺寸(WxH): %1 x %2 \n").arg(pCodecCtx->width).arg(pCodecCtx->height));
video_width=pCodecCtx->width;
video_height=pCodecCtx->height;
struct SwsContext *img_convert_ctx;
img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
AVPacket *in_packet=(AVPacket *)av_malloc(sizeof(AVPacket));
video_input.img_convert_ctx=img_convert_ctx;
video_input.in_packet=in_packet;
video_input.pCodecCtx=pCodecCtx;
video_input.pCodec=pCodec;
video_input.v_ifmtCtx=v_ifmtCtx;
video_input.videoindex=videoindex;
video_input.pFrame=pFrame;
video_input.pFrameYUV=pFrameYUV;
//-----------------------------添加摄像头结束
fmt=oc->oformat;
/*使用默认格式的编解码器添加音频和视频流并初始化编解码器。*/
qDebug("fmt->video_codec = %d\n", fmt->video_codec);
if(fmt->video_codec != AV_CODEC_ID_NONE)
{
add_stream(&video_st,oc,&video_codec,fmt->video_codec);
have_video=1;
encode_video=1;
}
/*现在已经设置了所有参数，可以打开音频并视频编解码器，并分配必要的编码缓冲区。*/
if(have_video)open_video(oc, video_codec, &video_st, opt);
av_dump_format(oc,0,filename,1);
/* 打开输出文件(如果需要) */
if(!(fmt->flags & AVFMT_NOFILE))
{
ret=avio_open(&oc->pb,filename,AVIO_FLAG_WRITE);
if(ret<0)
{
log_Display(tr("打不开%1: %2\n").arg(filename).arg(av_err2str(ret)));
return 1;
}
}
/* 编写流头(如果有)*/
ret=avformat_write_header(oc, &opt);
if(ret<0)
{
log_Display(tr("打开输出文件时发生错误: %1\n").arg(av_err2str(ret)));
return 1;
}
int got_pic;
while(encode_video)
{
/*选择要编码的流*/
AVFrame *frame=get_video_frame(&video_st,&video_input,&got_pic);
if(!got_pic)
{
QThread::msleep(10);
qDebug()<<"msleep(10);\n";
continue;
}
encode_video=!write_video_frame(oc,&video_st,frame);
}
qDebug()<<"结束录制\n";
av_write_trailer(oc);
qDebug()<<"准备释放空间.\n";
sws_freeContext(video_input.img_convert_ctx);
avcodec_close(video_input.pCodecCtx);
av_free(video_input.pFrameYUV);
av_free(video_input.pFrame);
avformat_close_input(&video_input.v_ifmtCtx);
qDebug()<<"关闭每个编解码器.\n";
/*关闭每个编解码器*/
if (have_video)close_stream(oc, &video_st);
qDebug()<<"关闭输出文件.\n";
/*关闭输出文件*/
if (!(fmt->flags & AVFMT_NOFILE))avio_closep(&oc->pb);
/*释放流*/
qDebug()<<"释放流.\n";
avformat_free_context(oc);
return 0;
}
int MainWindow::FFMPEG_Init_Config(const char *video,const char *size)
{
AVInputFormat *ifmt;
AVFormatContext *pFormatCtx;
AVCodecContext *pCodecCtx;
AVCodec *pCodec;
AVDictionary *options=nullptr;
AVPacket *packet;
AVFrame *pFrame,*pFrameYUV;
int videoindex;
int i,ret,got_picture;
/*1. FFMPEG初始化*/
av_register_all();
avcodec_register_all();
avdevice_register_all(); //注册多媒体设备交互的类库
/*2. 查找用于输入的设备*/
ifmt=av_find_input_format("video4linux2");
pFormatCtx=avformat_alloc_context();
av_dict_set(&options,"video_size",size,0); //设置摄像头输出的分辨率
//av_dict_set(&options,"framerate","30",0); //设置摄像头帧率. 每秒为单位,这里设置每秒30帧.
//一般帧率不用设置，默认为最高，帧率和输出的图像尺寸有关系
if(avformat_open_input(&pFormatCtx,video,ifmt,&options)!=0)
{
log_Display(tr("输入设备打开失败: %1\n").arg(video));
return -1;
}
if(avformat_find_stream_info(pFormatCtx,nullptr)<0)
{
log_Display("查找输入流失败.\n");
return -2;
}
videoindex=-1;
for(i=0;inb_streams;i++)
{
if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
{
videoindex=i;
break;
}
}
if(videoindex==-1)
{
log_Display("视频流查找失败.\n");
return -3;
}
pCodecCtx=pFormatCtx->streams[videoindex]->codec;
log_Display(tr("摄像头尺寸(WxH): %1 x %2 \n").arg(pCodecCtx->width).arg(pCodecCtx->height));
log_Display(tr("codec_id=%1").arg(pCodecCtx->codec_id));
pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
if(pCodec==nullptr)
{
log_Display("找不到编解码器.\n");
return -4;
}
if(avcodec_open2(pCodecCtx, pCodec,nullptr)<0)
{
log_Display("无法打开编解码器.\n");
return -5;
}
packet=(AVPacket *)av_malloc(sizeof(AVPacket));
pFrame=av_frame_alloc();
pFrameYUV=av_frame_alloc();
unsigned char *out_buffer=(unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16)); // avpicture_get_size
av_image_fill_arrays(pFrameYUV->data,pFrameYUV->linesize,out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height,16);
struct SwsContext *img_convert_ctx;
img_convert_ctx=sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
//读取一帧数据
if(av_read_frame(pFormatCtx, packet)>=0)
{
//输出图像的大小
log_Display(tr("数据大小=%1\n").arg(packet->size));
//判断是否是视频流
if(packet->stream_index==videoindex)
{
//解码从摄像头获取的数据，pframe结构
ret=avcodec_decode_video2(pCodecCtx, pFrame,&got_picture,packet);
if(ret<0)
{
log_Display("解码Error.\n");
return -6;
}
else
{
if(got_picture)
{
size_t y_size=pCodecCtx->width*pCodecCtx->height;
sws_scale(img_convert_ctx,(const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); //根据前面配置的缩放参数，进行图像格式转换以及缩放等操作
unsigned char *p=new unsigned char[y_size]; //申请空间
unsigned char *rgb24_p=new unsigned char[pCodecCtx->width*pCodecCtx->height*3];
//将YUV数据拷贝到缓冲区
memcpy(p,pFrameYUV->data[0],y_size);
memcpy(p+y_size,pFrameYUV->data[1],y_size/4);
memcpy(p+y_size+y_size/4,pFrameYUV->data[2],y_size/4);
//将YUV数据转为RGB格式plainTextEdit_FFMPEG_info_Display
YUV420P_to_RGB24(p,rgb24_p,pCodecCtx->width,pCodecCtx->height);
//加载到QIMAGE显示到QT控件
QImage image(rgb24_p,pCodecCtx->width,pCodecCtx->height,QImage::Format_RGB888);
QPixmap my_pixmap;
my_pixmap.convertFromImage(image);
ui->label_ImageDisplay->setPixmap(my_pixmap);
delete[] p; //释放空间
delete[] rgb24_p; //释放空间
}
}
}
}
avcodec_close(pCodecCtx); //关闭编码器
avformat_close_input(&pFormatCtx); //关闭输入设备
sws_freeContext(img_convert_ctx);
av_free(out_buffer);
av_free(pFrameYUV);
return 0;
}
/**
* YUV420P转RGB24
* @param data
* @param rgb
* @param width
* @param height
*/
void MainWindow::YUV420P_to_RGB24(unsigned char *data, unsigned char *rgb, int width, int height)
{
int index = 0;
unsigned char *ybase = data;
unsigned char *ubase = &data[width * height];
unsigned char *vbase = &data[width * height * 5 / 4];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
//YYYYYYYYUUVV
u_char Y = ybase[x + y * width];
u_char U = ubase[y / 2 * width / 2 + (x / 2)];
u_char V = vbase[y / 2 * width / 2 + (x / 2)];
rgb[index++] = Y + 1.402 * (V - 128); //R
rgb[index++] = Y - 0.34413 * (U - 128) - 0.71414 * (V - 128); //G
rgb[index++] = Y + 1.772 * (U - 128); //B
}
}
}
void MainWindow::on_pushButton_up_camear_clicked()
{
#if 1
if(ui->comboBox_camera_number->currentText().isEmpty())
{
ui->plainTextEdit_CameraOpenInfo->insertPlainText("未选择摄像头.\n");
return;
}
FFMPEG_Init_Config(ui->comboBox_camera_number->currentText().toLatin1().data(),
ui->comboBox_CamearSize->currentText().toLatin1().data());
#endif
}
void MainWindow::on_pushButton_getInfo_clicked()
{
get_ffmpeg_version_info();
}
void MainWindow::on_pushButton_RefreshCamear_clicked()
{
RefreshCameraList();
}
//刷新摄像头；列表
void MainWindow::RefreshCameraList(void)
{
QDir dir("/dev"); //构造目录
QStringList infolist = dir.entryList(QDir::System);
ui->comboBox_camera_number->clear();
for(int i=0; icomboBox_camera_number->addItem("/dev/"+infolist.at(i));
}
}
}
void MainWindow::on_pushButton_clicked()
{
FFMPEG_SaveVideo();
}
//推流视频
void MainWindow::on_pushButton_PushVideo_clicked()
{
QString filename=QFileDialog::getOpenFileName(this,"选择打开的文件","/sdcard/Movies/",tr("*.*"));
FFMPEG_PushVideo(filename.toLatin1().data(),"rtmp://js.live-send.acg.tv/live-js/?streamname=live_68130189_71037877&key=b95d4cfda0c196518f104839fe5e7573");
}
//推流视频
int MainWindow::FFMPEG_PushVideo(char *video_file,char *url)
{
AVFormatContext *pInFmtContext = NULL;
AVStream *in_stream;
AVCodecContext *pInCodecCtx;
AVCodec *pInCodec;
AVPacket *in_packet;
AVFormatContext * pOutFmtContext;
AVOutputFormat *outputFmt;
AVStream * out_stream;
AVRational frame_rate;
double duration;
int ret;
char in_file[128] = {0};
char out_file[256] = {0};
int videoindex = -1;
int audioindex = -1;
int video_frame_count = 0;
int audio_frame_count = 0;
int video_frame_size = 0;
int audio_frame_size = 0;
int i;
int got_picture;
memcpy(in_file, video_file, strlen(video_file));
memcpy(out_file, url, strlen(url));
qDebug()<<"in_file="<nb_streams; i++)
{
in_stream = pInFmtContext->streams[i];
if( in_stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
{
audioindex = i;
}
if( in_stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
{
videoindex = i;
frame_rate = av_guess_frame_rate(pInFmtContext, in_stream, NULL);
qDebug("video: frame_rate:%d/%d\n", frame_rate.num, frame_rate.den);
qDebug("video: frame_rate:%d/%d\n", frame_rate.den, frame_rate.num);
duration = av_q2d((AVRational){frame_rate.den, frame_rate.num});
}
pInCodec = avcodec_find_decoder(in_stream->codecpar->codec_id);
qDebug("%x, %d\n", pInCodec, in_stream->codecpar->codec_id);
out_stream = avformat_new_stream(pOutFmtContext, pInCodec);//in_stram->codec->codec);
if(out_stream == NULL)
{
qDebug("avformat_new_stream failed:%d\n",i);
}
ret = avcodec_parameters_copy(out_stream->codecpar, in_stream->codecpar);
if( ret < 0)
{
qDebug("avcodec_parameters_copy failed:%d\n", i);
}
out_stream->codecpar->codec_tag = 0;
if(pOutFmtContext->oformat->flags & AVFMT_GLOBALHEADER)
{//AVFMT_GLOBALHEADER 代表封装格式包含“全局头”（即整个文件的文件头），大部分封装格式是这样的。一些封装格式没有“全局头”，比如 MPEG2TS
out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
}
av_dump_format(pOutFmtContext,0,out_file,1);
ret=avio_open(&pOutFmtContext->pb, out_file, AVIO_FLAG_WRITE);
if(ret<0)
{
qDebug("avio_open failed:%d\n", ret);
return -1;
}
int64_t start_time = av_gettime();
ret = avformat_write_header(pOutFmtContext, NULL);
in_packet = av_packet_alloc();
while(1)
{
ret=av_read_frame(pInFmtContext, in_packet);
if(ret<0)
{
qDebug("read frame end\n");
break;
}
in_stream = pInFmtContext->streams[in_packet->stream_index];
if(in_packet->stream_index == videoindex)
{
video_frame_size += in_packet->size;
qDebug("recv %5d video frame %5d-%5d\n", ++video_frame_count, in_packet->size, video_frame_size);
}
if(in_packet->stream_index == audioindex)
{
audio_frame_size += in_packet->size;
qDebug("recv %5d audio frame %5d-%5d\n", ++audio_frame_count, in_packet->size, audio_frame_size);
}
int codec_type = in_stream->codecpar->codec_type;
if(codec_type == AVMEDIA_TYPE_VIDEO)
{
//根据 pts 时间与系统时间的关系来计算延时时间,该方案更优
AVRational dst_time_base = {1, AV_TIME_BASE};
int64_t pts_time=av_rescale_q(in_packet->pts,in_stream->time_base, dst_time_base);
int64_t now_time=av_gettime() - start_time;
if(pts_time > now_time)av_usleep(pts_time - now_time);
}
out_stream = pOutFmtContext->streams[in_packet->stream_index];
av_packet_rescale_ts(in_packet,in_stream->time_base, out_stream->time_base);
in_packet->pos = -1;
ret = av_interleaved_write_frame(pOutFmtContext, in_packet);
if(ret<0)
{
qDebug("av_interleaved_write_frame failed\n");
break;
}
av_packet_unref(in_packet);
}
av_write_trailer(pOutFmtContext);
av_packet_free(&in_packet);
avformat_close_input(&pInFmtContext);
avio_close( pOutFmtContext->pb);
avformat_free_context(pOutFmtContext);
return 0;
}
关于摄像头的访问权限、ADB命令使用、Android权限问题看这篇文章:
https://blog.csdn.net/xiaolong1126626497/article/details/104749999
本代码里: 推流功能需要使用网络、视频录制功能需要操作SD卡文件，所以需要在AndroidManifest.xml文件里增加一些权限。
关于QTonAndroid开发的一些技术问题，这里就不再探讨，后续有机会再更新。
在AndroidManifest.xml文件增加的权限如下:
QT工程的截图:
这张图是QT工程的结构:
这张图是推流视频到B站的效果: （我这里的推流视频是使用adb提前拷贝到指定目录下的 adb push 123.mp4 /system/xxx）
这张图是拍照显示的效果:
这张图片是录制视频存放到本地的效果:
下面公众号里有全套QT、C、C++基础学习教程：
