接着上一章，这一章主要是单独实现各个模块
开发环境介绍
windows下，采用
cmake+vs+qt开发，媒体库采用最新的ffmpeg4.4，均采用win64，win32可以自行配置
cmake version 3.21.4
Visual Studio 2019
Qt5.15.2CMakeLists.txt
CMAKE_MINIMUM_REQUIRED(VERSION 3.10)SET(PRJ_NAME RtspService)
PROJECT(${PRJ_NAME})IF(WIN32)
SET(CMAKE_DEBUG_POSTFIX "_d")
ENDIF(WIN32)IF(NOT CMAKE_BUILD_TYPE)
IF(WIN32)
ELSE(WIN32)
SET(CMAKE_BUILD_TYPE Debug)
ENDIF(WIN32)ENDIF()IF(WIIN32)
SET(CMAKE_SYSTEM_VERSION 10.0)
ENDIF(WIN32)MESSAGE(STATUS ${PROJECT_SOURCE_DIR})
MESSAGE(STATUS ${PROJECT_BINARY_DIR})
MESSAGE(STATUS ${CMAKE_BINARY_DIR})IF(WIN32)
IF(CMAKE_CL_64)
SET(BASELIB_PATH ${PROJECT_SOURCE_DIR}/bin/win64)
ELSE(CMAKE_CL_64)
SET(BASELIB_PATH ${PROJECT_SOURCE_DIR}/bin/win32)
ENDIF(CMAKE_CL_64)
ENDIF(WIN32)
LINK_DIRECTORIES(${BASELIB_PATH})IF(WIN32)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHsc")
ELSE(WIN32)
SET(CMAKE_CXX_STANDARD 11)
SET(CMAKE_CXX_FLAGS_DEBUG "$ENV{CXXFLAGS}" -O0 -Wall -g3 -ggdb -D_DEBUG -DDEBUG)
SET(CMAKE_CXX_FLAGS_RELEASE "$ENV{CXXFLAGS} -O3 -Wall -DNDEBUG")
ADD_COMPILE_OPTIONS(-std=c++11)
ENDIF(WIN32)IF(WIN32)
ADD_DEFINITIONS(-DUNICODE -D_UNICODE)
SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi /Od")
SET(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /DEBUG /OPT:REF /OPT:ICF")
SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /DEBUG /OPT:REF /OPT:ICF")
IF(CMAKE_CL_64)
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG ${PROJECT_SOURCE_DIR}/bin/win64/debug)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG ${PROJECT_SOURCE_DIR}/bin/win64/debug)
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${PROJECT_SOURCE_DIR}/bin/win64/debug)
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE ${PROJECT_SOURCE_DIR}/bin/win64/release)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE ${PROJECT_SOURCE_DIR}/bin/win64/release)
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${PROJECT_SOURCE_DIR}/bin/win64/release)
ELSE(CMAKE_CL_64)
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG ${PROJECT_SOURCE_DIR}/bin/win32/debug)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG ${PROJECT_SOURCE_DIR}/bin/win32/debug)
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${PROJECT_SOURCE_DIR}/bin/win32/debug)
SET(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE ${PROJECT_SOURCE_DIR}/bin/win32/release)
SET(CMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE ${PROJECT_SOURCE_DIR}/bin/win32/release)
SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${PROJECT_SOURCE_DIR}/bin/win32/release)
ENDIF(CMAKE_CL_64)
ENDIF(WIN32)INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/include)IF(WIN32)
IF(CMAKE_CL_64)
SET(CMAKE_PREFIX_PATH "D:/Qt/5.15.2/msvc2019_64")
ELSE(CMAKE_CL_64)
SET(CMAKE_PREFIX_PATH "D:/Qt/5.15.2/msvc2019")
ENDIF(CMAKE_CL_64)
ELSE(WIN32)
SET(CMAKE_PREFIX_PATH ${QTDIR}/5.15.2)
ENDIF(WIN32)ADD_SUBDIRECTORY(test/testCapture)
ADD_SUBDIRECTORY(test/testEncoder)
ADD_SUBDIRECTORY(test/testRtspServer)
文章图片
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#ifdef __cplusplusextern "C"
{
#endif // __cplusplus
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavdevice/avdevice.h"
#ifdef __cplusplus
}
#endif // __cplusplus#include #define __STDC_CONSTANT_MACROS//Output YUV420P
#define OUTPUT_YUV420P 1
//'1' Use Dshow
//'0' Use GDIgrab
#define USE_DSHOW 0//Show Dshow Device
void show_dshow_device() {
AVFormatContext* pFormatCtx = avformat_alloc_context();
AVDictionary* options = NULL;
av_dict_set(&options, "list_devices", "true", 0);
AVInputFormat* iformat = av_find_input_format("dshow");
printf("========Device Info=============\n");
avformat_open_input(&pFormatCtx, "video=dummy", iformat, &options);
printf("================================\n");
}//Show AVFoundation Device
void show_avfoundation_device() {
AVFormatContext* pFormatCtx = avformat_alloc_context();
AVDictionary* options = NULL;
av_dict_set(&options, "list_devices", "true", 0);
AVInputFormat* iformat = av_find_input_format("avfoundation");
printf("==AVFoundation Device Info===\n");
avformat_open_input(&pFormatCtx, "", iformat, &options);
printf("=============================\n");
}int main(int argc, char* argv[])
{AVFormatContext* pFormatCtx;
inti, videoindex;
AVCodecContext* pCodecCtx;
AVCodec* pCodec;
av_register_all();
avformat_network_init();
pFormatCtx = avformat_alloc_context();
//Register Device
avdevice_register_all();
//Windows
#ifdef _WIN32
//Use gdigrab
AVDictionary* options = NULL;
AVInputFormat* ifmt = av_find_input_format("gdigrab");
if (avformat_open_input(&pFormatCtx, "desktop", ifmt, &options) != 0) {
printf("Couldn't open input stream.\n");
return -1;
}#elif linux
//Linux
AVDictionary* options = NULL;
AVInputFormat* ifmt = av_find_input_format("x11grab");
//Grab at position 10,20
if (avformat_open_input(&pFormatCtx, ":0.0+10,20", ifmt, &options) != 0) {
printf("Couldn't open input stream.\n");
return -1;
}
#else
show_avfoundation_device();
//Mac
AVInputFormat* ifmt = av_find_input_format("avfoundation");
//Avfoundation
//[video]:[audio]
if (avformat_open_input(&pFormatCtx, "1", ifmt, NULL) != 0) {
printf("Couldn't open input stream.\n");
return -1;
}
#endifif (avformat_find_stream_info(pFormatCtx, NULL) < 0)
{
printf("Couldn't find stream information.\n");
return -1;
}
videoindex = -1;
for (i = 0;
i < pFormatCtx->nb_streams;
i++)
if (pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
videoindex = i;
break;
}
if (videoindex == -1)
{
printf("Didn't find a video stream.\n");
return -1;
}
pCodecCtx = pFormatCtx->streams[videoindex]->codec;
pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
if (pCodec == NULL)
{
printf("Codec not found.\n");
return -1;
}
if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0)
{
printf("Could not open codec.\n");
return -1;
}
AVFrame* pFrame, * pFrameYUV;
pFrame = av_frame_alloc();
pFrameYUV = av_frame_alloc();
int ret, got_picture;
int buf_size;
AVPacket* packet = (AVPacket*)av_malloc(sizeof(AVPacket));
uint8_t* buffer = NULL;
#if OUTPUT_YUV420P
FILE* fp_yuv = fopen("output.yuv", "wb+");
#endifstruct 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);
pFrameYUV->format = AV_PIX_FMT_YUV420P;
pFrameYUV->width = pCodecCtx->width;
pFrameYUV->height = pCodecCtx->height;
if (av_frame_get_buffer(pFrameYUV, 32) != 0) {
return -1;
}
int index = 0;
while (av_read_frame(pFormatCtx, packet) >= 0) {
if (++index > 500)
{
break;
}
if (packet->stream_index == videoindex) {
int ret = avcodec_send_packet(pCodecCtx, packet);
if (ret < 0) {
printf("Decode Error.\n");
return -1;
}if (ret >= 0) {
ret = avcodec_receive_frame(pCodecCtx, pFrame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
printf("no frame Error.\n");
return -1;
}
}
sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
#if OUTPUT_YUV420P
int y_size = pCodecCtx->width * pCodecCtx->height;
fwrite(pFrameYUV->data[0], 1, y_size, fp_yuv);
//Y
fwrite(pFrameYUV->data[1], 1, y_size / 4, fp_yuv);
//U
fwrite(pFrameYUV->data[2], 1, y_size / 4, fp_yuv);
//V
printf("Write frame %d\n", index);
#endif
}
av_free_packet(packet);
}sws_freeContext(img_convert_ctx);
#if OUTPUT_YUV420P
fclose(fp_yuv);
#endif
av_free(pFrameYUV);
avcodec_close(pCodecCtx);
avformat_close_input(&pFormatCtx);
return 0;
}
二、编码模块
#ifdef __cplusplusextern "C"
{
#endif // __cplusplus
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavdevice/avdevice.h"
#include "libavutil/time.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#ifdef __cplusplus
}
#endif // __cplusplus#include #include
#include
#include int64_t get_time() {
return av_gettime_relative() / 1000;
// 换算成毫秒
}static int encode(AVCodecContext* enc_ctx, AVFrame* frame, AVPacket* pkt,
FILE* outfile) {
int ret;
/* send the frame to the encoder */
if (frame)
printf("Send frame %lld\n", frame->pts);
/* 通过查阅代码，使用x264进行编码时，具体缓存帧是在x264源码进行，
* 不会增加avframe对应buffer的reference*/
ret = avcodec_send_frame(enc_ctx, frame);
if (ret < 0) {
fprintf(stderr, "Error sending a frame for encoding\n");
return -1;
}while (ret >= 0) {
ret = avcodec_receive_packet(enc_ctx, pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
return 0;
}
else if (ret < 0) {
fprintf(stderr, "Error encoding audio frame\n");
return -1;
}if (pkt->flags & AV_PKT_FLAG_KEY)
printf("Write packet flags:%d pts:%lld dts:%lld (size:%5d)\n",
pkt->flags, pkt->pts, pkt->dts, pkt->size);
if (!pkt->flags)
printf("Write packet flags:%d pts:%lld dts:%lld (size:%5d)\n",
pkt->flags, pkt->pts, pkt->dts, pkt->size);
fwrite(pkt->data, 1, pkt->size, outfile);
}
return 0;
}int main(int argc, char** argv) {
char* in_yuv_file = NULL;
char* out_h264_file = NULL;
FILE* infile = NULL;
FILE* outfile = NULL;
const char* codec_name = NULL;
const AVCodec* codec = NULL;
AVCodecContext* codec_ctx = NULL;
AVFrame* frame = NULL;
AVPacket* pkt = NULL;
int ret = 0;
in_yuv_file = "test.yuv";
// 输入YUV文件
out_h264_file = "test.h264";
codec_name = "libx264";
/* 查找指定的编码器 */
codec = avcodec_find_encoder_by_name(codec_name);
if (!codec) {
fprintf(stderr, "Codec '%s' not found\n", codec_name);
exit(1);
}codec_ctx = avcodec_alloc_context3(codec);
if (!codec_ctx) {
fprintf(stderr, "Could not allocate video codec context\n");
exit(1);
}/* 设置分辨率*/
codec_ctx->width = 1920;
codec_ctx->height = 1080;
/* 设置time base */
codec_ctx->time_base = AVRational{ 1, 25 };
codec_ctx->framerate = AVRational{ 25, 1 };
/* 设置I帧间隔
* 如果frame->pict_type设置为AV_PICTURE_TYPE_I, 则忽略gop_size的设置，一直当做I帧进行编码
*/
codec_ctx->gop_size = 25;
// I帧间隔
codec_ctx->max_b_frames = 2;
// 如果不想包含B帧则设置为0
codec_ctx->pix_fmt = AV_PIX_FMT_YUV420P;
//
if (codec->id == AV_CODEC_ID_H264) {
// 相关的参数可以参考libx264.c的 AVOption options
ret = av_opt_set(codec_ctx->priv_data, "preset", "medium", 0);
if (ret != 0) {
printf("av_opt_set preset failed\n");
}
ret = av_opt_set(codec_ctx->priv_data, "profile", "main", 0);
// 默认是high
if (ret != 0) {
printf("av_opt_set profile failed\n");
}
ret = av_opt_set(codec_ctx->priv_data, "tune", "zerolatency", 0);
// 直播是才使用该设置
//ret = av_opt_set(codec_ctx->priv_data, "tune","film",0);
//画质film
if (ret != 0) {
printf("av_opt_set tune failed\n");
}
}/*
* 设置编码器参数
*/
/* 设置bitrate */
codec_ctx->bit_rate = 3000000;
/* 将codec_ctx和codec进行绑定 */
ret = avcodec_open2(codec_ctx, codec, NULL);
if (ret < 0) {
fprintf(stderr, "Could not open codec!\n");
exit(1);
}
printf("thread_count: %d, thread_type:%d\n", codec_ctx->thread_count, codec_ctx->thread_type);
// 打开输入和输出文件
infile = fopen(in_yuv_file, "rb");
if (!infile) {
fprintf(stderr, "Could not open %s\n", in_yuv_file);
exit(1);
}
outfile = fopen(out_h264_file, "wb");
if (!outfile) {
fprintf(stderr, "Could not open %s\n", out_h264_file);
exit(1);
}// 分配pkt和frame
pkt = av_packet_alloc();
if (!pkt) {
fprintf(stderr, "Could not allocate video frame\n");
exit(1);
}
frame = av_frame_alloc();
if (!frame) {
fprintf(stderr, "Could not allocate video frame\n");
exit(1);
}// 为frame分配buffer
frame->format = codec_ctx->pix_fmt;
frame->width = codec_ctx->width;
frame->height = codec_ctx->height;
ret = av_frame_get_buffer(frame, 0);
if (ret < 0) {
fprintf(stderr, "Could not allocate the video frame data\n");
exit(1);
}
// 计算出每一帧的数据 像素格式 * 宽 * 高
// 1382400
int frame_bytes = av_image_get_buffer_size((AVPixelFormat)frame->format, frame->width,
frame->height, 1);
printf("frame_bytes %d\n", frame_bytes);
uint8_t* yuv_buf = (uint8_t*)malloc(frame_bytes);
if (!yuv_buf) {
printf("yuv_buf malloc failed\n");
return 1;
}
int64_t begin_time = get_time();
int64_t end_time = begin_time;
int64_t all_begin_time = get_time();
int64_t all_end_time = all_begin_time;
int64_t pts = 0;
printf("start enode\n");
for (;
;
) {
memset(yuv_buf, 0, frame_bytes);
size_t read_bytes = fread(yuv_buf, 1, frame_bytes, infile);
if (read_bytes <= 0) {
printf("read file finish\n");
break;
}
/* 确保该frame可写, 如果编码器内部保持了内存参考计数，则需要重新拷贝一个备份
目的是新写入的数据和编码器保存的数据不能产生冲突
*/
int frame_is_writable = 1;
if (av_frame_is_writable(frame) == 0) { // 这里只是用来测试
printf("the frame can't write, buf:%p\n", frame->buf[0]);
if (frame->buf && frame->buf[0])// 打印referenc-counted，必须保证传入的是有效指针
printf("ref_count1(frame) = %d\n", av_buffer_get_ref_count(frame->buf[0]));
frame_is_writable = 0;
}
ret = av_frame_make_writable(frame);
if (frame_is_writable == 0) {// 这里只是用来测试
printf("av_frame_make_writable, buf:%p\n", frame->buf[0]);
if (frame->buf && frame->buf[0])// 打印referenc-counted，必须保证传入的是有效指针
printf("ref_count2(frame) = %d\n", av_buffer_get_ref_count(frame->buf[0]));
}
if (ret != 0) {
printf("av_frame_make_writable failed, ret = %d\n", ret);
break;
}
int need_size = av_image_fill_arrays(frame->data, frame->linesize, yuv_buf,
(AVPixelFormat)frame->format,
frame->width, frame->height, 1);
if (need_size != frame_bytes) {
printf("av_image_fill_arrays failed, need_size:%d, frame_bytes:%d\n",
need_size, frame_bytes);
break;
}
pts += 40;
// 设置pts
frame->pts = pts;
// 使用采样率作为pts的单位，具体换算成秒 pts*1/采样率
begin_time = get_time();
ret = encode(codec_ctx, frame, pkt, outfile);
end_time = get_time();
printf("encode time:%lldms\n", end_time - begin_time);
if (ret < 0) {
printf("encode failed\n");
break;
}
}/* 冲刷编码器 */
encode(codec_ctx, NULL, pkt, outfile);
all_end_time = get_time();
printf("all encode time:%lldms\n", all_end_time - all_begin_time);
// 关闭文件
fclose(infile);
fclose(outfile);
// 释放内存
if (yuv_buf) {
free(yuv_buf);
}av_frame_free(&frame);
av_packet_free(&pkt);
avcodec_free_context(&codec_ctx);
printf("main finish, please enter Enter and exit\n");
getchar();
return 0;
}三、封装模块 本处直接使用ES裸流。暂时不写MP4
四、传输模块
#include // RTSP Server#include "xop/RtspServer.h"
#include "net/Timer.h"
#include
#include
#include
#include class H264File
{
public:
H264File(int buf_size = 500000);
~H264File();
bool Open(const char* path);
void Close();
bool IsOpened() const
{
return (m_file != NULL);
}int ReadFrame(char* in_buf, int in_buf_size, bool* end);
private:
FILE* m_file = NULL;
char* m_buf = NULL;
intm_buf_size = 0;
intm_bytes_used = 0;
intm_count = 0;
};
void SendFrameThread(rtsp::RtspServer* rtsp_server, rtsp::MediaSessionId session_id, H264File* h264_file);
int main(int argc, char** argv)
{
H264File h264_file;
if (!h264_file.Open("test.h264")) {
printf("Open %s failed.\n", argv[1]);
return 0;
}std::string suffix = "live";
std::string ip = "127.0.0.1";
std::string port = "554";
std::string rtsp_url = "rtsp://" + ip + ":" + port + "/" + suffix;
std::shared_ptr event_loop(new rtsp::EventLoop());
std::shared_ptr server = rtsp::RtspServer::Create(event_loop.get());
if (!server->Start("0.0.0.0", atoi(port.c_str()))) {
printf("RTSP Server listen on %s failed.\n", port.c_str());
return 0;
}#ifdef AUTH_CONFIG
server->SetAuthConfig("-_-", "admin", "12345");
#endifrtsp::MediaSession* session = rtsp::MediaSession::CreateNew("live");
session->AddSource(rtsp::channel_0, rtsp::H264Source::CreateNew());
//session->StartMulticast();
session->AddNotifyConnectedCallback([](rtsp::MediaSessionId sessionId, std::string peer_ip, uint16_t peer_port) {
printf("RTSP client connect, ip=%s, port=%hu \n", peer_ip.c_str(), peer_port);
});
session->AddNotifyDisconnectedCallback([](rtsp::MediaSessionId sessionId, std::string peer_ip, uint16_t peer_port) {
printf("RTSP client disconnect, ip=%s, port=%hu \n", peer_ip.c_str(), peer_port);
});
rtsp::MediaSessionId session_id = server->AddSession(session);
std::thread t1(SendFrameThread, server.get(), session_id, &h264_file);
t1.detach();
std::cout << "Play URL: " << rtsp_url << std::endl;
while (1) {
rtsp::Timer::Sleep(100);
}getchar();
return 0;
}void SendFrameThread(rtsp::RtspServer* rtsp_server, rtsp::MediaSessionId session_id, H264File* h264_file)
{
int buf_size = 2000000;
std::unique_ptr frame_buf(new uint8_t[buf_size]);
while (1) {
bool end_of_frame = false;
int frame_size = h264_file->ReadFrame((char*)frame_buf.get(), buf_size, &end_of_frame);
if (frame_size > 0) {
rtsp::AVFrame videoFrame = { 0 };
videoFrame.type = 0;
videoFrame.size = frame_size;
videoFrame.timestamp = rtsp::H264Source::GetTimestamp();
videoFrame.buffer.reset(new uint8_t[videoFrame.size]);
memcpy(videoFrame.buffer.get(), frame_buf.get(), videoFrame.size);
rtsp_server->PushFrame(session_id, rtsp::channel_0, videoFrame);
}
else {
break;
}rtsp::Timer::Sleep(40);
};
}H264File::H264File(int buf_size)
: m_buf_size(buf_size)
{
m_buf = new char[m_buf_size];
}H264File::~H264File()
{
delete[] m_buf;
}bool H264File::Open(const char* path)
{
m_file = fopen(path, "rb");
if (m_file == NULL) {
return false;
}return true;
}void H264File::Close()
{
if (m_file) {
fclose(m_file);
m_file = NULL;
m_count = 0;
m_bytes_used = 0;
}
}int H264File::ReadFrame(char* in_buf, int in_buf_size, bool* end)
{
if (m_file == NULL) {
return -1;
}int bytes_read = (int)fread(m_buf, 1, m_buf_size, m_file);
if (bytes_read == 0) {
fseek(m_file, 0, SEEK_SET);
m_count = 0;
m_bytes_used = 0;
bytes_read = (int)fread(m_buf, 1, m_buf_size, m_file);
if (bytes_read == 0) {
this->Close();
return -1;
}
}bool is_find_start = false, is_find_end = false;
int i = 0, start_code = 3;
*end = false;
for (i = 0;
i < bytes_read - 5;
i++) {
if (m_buf[i] == 0 && m_buf[i + 1] == 0 && m_buf[i + 2] == 1) {
start_code = 3;
}
else if (m_buf[i] == 0 && m_buf[i + 1] == 0 && m_buf[i + 2] == 0 && m_buf[i + 3] == 1) {
start_code = 4;
}
else {
continue;
}if (((m_buf[i + start_code] & 0x1F) == 0x5 || (m_buf[i + start_code] & 0x1F) == 0x1)
&& ((m_buf[i + start_code + 1] & 0x80) == 0x80)) {
is_find_start = true;
i += 4;
break;
}
}for (;
i < bytes_read - 5;
i++) {
if (m_buf[i] == 0 && m_buf[i + 1] == 0 && m_buf[i + 2] == 1)
{
start_code = 3;
}
else if (m_buf[i] == 0 && m_buf[i + 1] == 0 && m_buf[i + 2] == 0 && m_buf[i + 3] == 1) {
start_code = 4;
}
else {
continue;
}if (((m_buf[i + start_code] & 0x1F) == 0x7) || ((m_buf[i + start_code] & 0x1F) == 0x8)
|| ((m_buf[i + start_code] & 0x1F) == 0x6) || (((m_buf[i + start_code] & 0x1F) == 0x5
|| (m_buf[i + start_code] & 0x1F) == 0x1) && ((m_buf[i + start_code + 1] & 0x80) == 0x80))) {
is_find_end = true;
break;
}
}bool flag = false;
if (is_find_start && !is_find_end && m_count > 0) {
flag = is_find_end = true;
i = bytes_read;
*end = true;
}if (!is_find_start || !is_find_end) {
this->Close();
return -1;
}int size = (i <= in_buf_size ? i : in_buf_size);
memcpy(in_buf, m_buf, size);
if (!flag) {
m_count += 1;
m_bytes_used += i;
}
else {
m_count = 0;
m_bytes_used = 0;
}fseek(m_file, m_bytes_used, SEEK_SET);
return size;
}
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【流媒体服务器|基于Qt和ffmpeg的抓屏rtsp服务（二）】
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2
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五、结束语
通过各个模块单独的列举出来，这样让我能够更加深入的去理解各个模块之间的作用。让我能够更好的去理解和学习。同时也能单独测试各个模块。
工程地址：gitee代码地址
① 下载代码，先运行bin目录下的bat脚本，可以将release和debug都运行一次
② 然后在代码根目录下新建一个build64目录
③ 运行cmd窗口到当前目录下，运行 cmake … -G “Visual Studio 16” -A x64
④ 图2中，依次运行，最总在bin/win64/debug或者bin/win64/release下按图3运行，可以使用vlc进行测试，rtsp://127.0.0.1:554/live
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