缅怀雷大神:https://blog.youkuaiyun.com/leixiaohua1020/article/details/38868499
一、 声明头文件
由于FFmpeg和SDL使用纯C来实现的,我们需要声明用C来编译
extern "C"
{
//封装格式
#include "libavformat/avformat.h"
//解码
#include "libavcodec/avcodec.h"
//缩放
#include "libswscale/swscale.h"
#include "libswresample/swresample.h" //声音文件使用
#include "libavutil/imgutils.h" //播放图像使用
//播放
#include "SDL2/SDL.h"
};
二、 注册组件以初始化
av_register_all();
avformat_network_init();
pFormatCtx = avformat_alloc_context();
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER))
{
printf("Could not initialize SDL - %s\n", SDL_GetError());
}
三、 打开文件并且获取解码器
filepath:文件路径("G:/迅雷下载/老师好.mp4")
type:数据流类型(音频:AVMEDIA_TYPE_VIDEO)
//打开输入文件
if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0){
printf("Couldn't open input stream.\n");
return -1;
}
//获取文件信息
if (avformat_find_stream_info(pFormatCtx, NULL)<0){
printf("Couldn't find stream information.\n");
return -1;
}
//找到对应的type所在的pFormatCtx->streams的索引位置
index = -1;
for (int i = 0; i<pFormatCtx->nb_streams; i++)
if (pFormatCtx->streams[i]->codec->codec_type == type){
index = i;
break;
}
if (index == -1){
printf("Didn't find a video stream.\n");
return -1;
}
//获取解码器
pCodeCtx = pFormatCtx->streams[index]->codec;
pCodec = avcodec_find_decoder(pCodeCtx->codec_id);
if (pCodec == NULL){
printf("Codec not found.\n");
return -1;
}
//打开解码器
if (avcodec_open2(pCodeCtx, pCodec, NULL)<0){
printf("Could not open codec.\n");
return -1;
}
四、设置SDL界面
//SDL 2.0 Support for multiple windows
/*screen_w = pCodeCtx->width;
screen_h = pCodeCtx->height;*/
int screen_w = 800;
int screen_h = 600;
SDL_Window *screen = SDL_CreateWindow("Simplest ffmpeg player's Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
screen_w, screen_h, SDL_WINDOW_OPENGL);
if (!screen) {
printf("SDL: could not create window - exiting:%s\n", SDL_GetError());
return -1;
}
sdlRenderer = SDL_CreateRenderer(screen, -1, 0);
sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, pCodeCtx->width, pCodeCtx->height);
五、读取数据并播放
通过SDL线程来优化播放界面不流畅
int sfp_refresh_thread(void *opaque){
while (1)
{
SDL_Event event;
event.type = SFM_REFRESH_EVENT;
SDL_PushEvent(&event);
SDL_Delay(40);
}
return 0;
}
AVPacket *packet = (AVPacket *)av_malloc(sizeof(AVPacket));
//内存分配
AVFrame *pFrame = av_frame_alloc();
AVFrame *pFrameYUV = av_frame_alloc();
//缓冲区分配内存
unsigned char *out_buffer = (unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodeCtx->width, pCodeCtx->height, 1));
//初始化缓冲区
av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer,
AV_PIX_FMT_YUV420P, pCodeCtx->width, pCodeCtx->height, 1);
img_convert_ctx = sws_getContext(pCodeCtx->width, pCodeCtx->height, pCodeCtx->pix_fmt,
pCodeCtx->width, pCodeCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
int ret, got_picture;
SDL_CreateThread(sfp_refresh_thread, NULL, NULL);
while (av_read_frame(pFormatCtx, packet) >= 0)
{
if (packet->stream_index == index)
{
ret = avcodec_decode_video2(pCodeCtx, pFrame, &got_picture, packet);
if (ret < 0){
printf("Decode Error.\n");
}
if (got_picture)
{
sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodeCtx->height, pFrameYUV->data, pFrameYUV->linesize);
}
while (1)
{
SDL_WaitEvent(&event);
if (event.type == SFM_REFRESH_EVENT)
{
//SDL---------------------------
SDL_UpdateTexture(sdlTexture, NULL, pFrameYUV->data[0], pFrameYUV->linesize[0]);
SDL_RenderClear(sdlRenderer);
SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, NULL);
SDL_RenderPresent(sdlRenderer);
//SDL End-----------------------
break;
}
}
}
}
六、 完整代码
extern "C"
{
//封装格式
#include "libavformat/avformat.h"
//解码
#include "libavcodec/avcodec.h"
//缩放
#include "libswscale/swscale.h"
#include "libswresample/swresample.h"
#include "libavutil/imgutils.h"
//播放
#include "SDL2/SDL.h"
};
#define SFM_REFRESH_EVENT (SDL_USEREVENT + 1)
#define SFM_BREAK_EVENT (SDL_USEREVENT + 2)
int sfp_refresh_thread(void *opaque){
while (1)
{
SDL_Event event;
event.type = SFM_REFRESH_EVENT;
SDL_PushEvent(&event);
SDL_Delay(40);
}
return 0;
}
int main(int argc, char* argv[])
{
AVFormatContext *pFormatCtx;
AVCodecContext *pCodeCtx;
AVCodec *pCodec;
int index;
struct SwsContext *img_convert_ctx;
SDL_Renderer* sdlRenderer;
SDL_Texture* sdlTexture;
SDL_Thread *video_tid;
SDL_Event event;
av_register_all();
avformat_network_init();
pFormatCtx = avformat_alloc_context();
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {
printf("Could not initialize SDL - %s\n", SDL_GetError());
}
char *filepath;
int type;
filepath = "G:/迅雷下载/老师好.mp4";
type = AVMEDIA_TYPE_VIDEO;
//打开输入文件
if (avformat_open_input(&pFormatCtx, filepath, NULL, NULL) != 0){
printf("Couldn't open input stream.\n");
return -1;
}
//获取文件信息
if (avformat_find_stream_info(pFormatCtx, NULL)<0){
printf("Couldn't find stream information.\n");
return -1;
}
//找到对应的type所在的pFormatCtx->streams的索引位置
index = -1;
for (int i = 0; i<pFormatCtx->nb_streams; i++)
if (pFormatCtx->streams[i]->codec->codec_type == type){
index = i;
break;
}
if (index == -1){
printf("Didn't find a video stream.\n");
return -1;
}
//获取解码器
pCodeCtx = pFormatCtx->streams[index]->codec;
pCodec = avcodec_find_decoder(pCodeCtx->codec_id);
if (pCodec == NULL){
printf("Codec not found.\n");
return -1;
}
//打开解码器
if (avcodec_open2(pCodeCtx, pCodec, NULL)<0){
printf("Could not open codec.\n");
return -1;
}
//SDL 2.0 Support for multiple windows
/*screen_w = pCodeCtx->width;
screen_h = pCodeCtx->height;*/
int screen_w = 800;
int screen_h = 600;
SDL_Window *screen = SDL_CreateWindow("Simplest ffmpeg player's Window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
screen_w, screen_h, SDL_WINDOW_OPENGL);
if (!screen) {
printf("SDL: could not create window - exiting:%s\n", SDL_GetError());
return -1;
}
sdlRenderer = SDL_CreateRenderer(screen, -1, 0);
sdlTexture = SDL_CreateTexture(sdlRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, pCodeCtx->width, pCodeCtx->height);
AVPacket *packet = (AVPacket *)av_malloc(sizeof(AVPacket));
//内存分配
AVFrame *pFrame = av_frame_alloc();
AVFrame *pFrameYUV = av_frame_alloc();
//缓冲区分配内存
unsigned char *out_buffer = (unsigned char *)av_malloc(av_image_get_buffer_size(AV_PIX_FMT_YUV420P, pCodeCtx->width, pCodeCtx->height, 1));
//初始化缓冲区
av_image_fill_arrays(pFrameYUV->data, pFrameYUV->linesize, out_buffer,
AV_PIX_FMT_YUV420P, pCodeCtx->width, pCodeCtx->height, 1);
img_convert_ctx = sws_getContext(pCodeCtx->width, pCodeCtx->height, pCodeCtx->pix_fmt,
pCodeCtx->width, pCodeCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL);
int ret, got_picture;
SDL_CreateThread(sfp_refresh_thread, NULL, NULL);
while (av_read_frame(pFormatCtx, packet) >= 0)
{
if (packet->stream_index == index)
{
ret = avcodec_decode_video2(pCodeCtx, pFrame, &got_picture, packet);
if (ret < 0){
printf("Decode Error.\n");
}
if (got_picture)
{
sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodeCtx->height, pFrameYUV->data, pFrameYUV->linesize);
}
while (1)
{
SDL_WaitEvent(&event);
if (event.type == SFM_REFRESH_EVENT)
{
//SDL---------------------------
SDL_UpdateTexture(sdlTexture, NULL, pFrameYUV->data[0], pFrameYUV->linesize[0]);
SDL_RenderClear(sdlRenderer);
SDL_RenderCopy(sdlRenderer, sdlTexture, NULL, NULL);
SDL_RenderPresent(sdlRenderer);
//SDL End-----------------------
break;
}
}
}
}
sws_freeContext(img_convert_ctx);
av_free(out_buffer);
av_free_packet(packet);
av_frame_free(&pFrameYUV);
av_frame_free(&pFrame);
SDL_Quit();
avcodec_close(pCodeCtx);
avformat_close_input(&pFormatCtx);
return 0;
}