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| #include <iostream>
extern "C" {
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
#include <SDL.h>
}
#define UPDATE_ONE_FRAME (SDL_USEREVENT +1)
#define EXIT (SDL_USEREVENT +2)
#undef main
using namespace std;
SDL_Window* sdl_window;
SDL_Renderer* sdl_render;
SDL_Texture* sdl_texture;
SDL_Rect sdl_rect;
int thread_exit = 0;
bool is_video_index = 0;
int decode_one_frame(void* arg)
{
while (!thread_exit)
{
SDL_Event event;
event.type = UPDATE_ONE_FRAME;
SDL_PushEvent(&event);
if (is_video_index)
{
SDL_Delay(40);
}
else
{
SDL_Delay(1);
}
}
SDL_Event breakEvent;
breakEvent.type = EXIT;
SDL_PushEvent(&breakEvent);
return 0;
}
int initSDL(const char* title, int &video_w, int &video_h, int &padding)
{
int window_w = video_w + padding + padding;
int window_h = video_h + padding + padding;
if (SDL_Init(SDL_INIT_VIDEO)) {
cout << "init sdl failed!" << endl;
return -1;
}
sdl_window = SDL_CreateWindow(title, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
window_w, window_h, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
sdl_render = SDL_CreateRenderer(sdl_window, -1, 0);
uint32_t pix_format = SDL_PIXELFORMAT_IYUV;
sdl_texture = SDL_CreateTexture(sdl_render, pix_format, SDL_TEXTUREACCESS_STREAMING, video_w, video_h);
}
int main()
{
AVFormatContext* format_ctx = NULL;
AVCodecContext* codec_ctx;
AVCodecParameters* codec_params = NULL;
const AVCodec* codec;
AVPacket* packet = av_packet_alloc();
AVFrame* frame = av_frame_alloc();
AVFrame* yuv_frame = av_frame_alloc();
int video_stream_index = -1;
const char* file_name = "./one_piece.mp4";
int ret = avformat_open_input(&format_ctx, file_name, NULL, NULL);
if (ret < 0)
{
cout << "打开文件失败！" << endl;
return -1;
}
ret = avformat_find_stream_info(format_ctx, NULL);
if (ret < 0)
{
cout << "寻找流信息失败！" << endl;
return -1;
}
for (int i = 0; i < format_ctx->nb_streams; i++)
{
if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
{
codec_params = format_ctx->streams[i]->codecpar;
video_stream_index = i;
}
}
if (video_stream_index < 0)
{
cout << "没有视频流！" << endl;
return -1;
}
codec = avcodec_find_decoder(codec_params->codec_id);
if (codec == NULL)
{
cout << "寻找解码器失败！" << endl;
return -1;
}
codec_ctx = avcodec_alloc_context3(codec);
avcodec_parameters_to_context(codec_ctx, codec_params);
ret = avcodec_open2(codec_ctx, codec, NULL);
if (ret < 0)
{
cout << "打开解码器失败！" << endl;
return -1;
}
int buffer_size = av_image_get_buffer_size(AV_PIX_FMT_YUV420P, codec_ctx->width, codec_ctx->height, 1);
uint8_t* buffer = (uint8_t*)av_malloc(sizeof(uint8_t) * buffer_size);
av_image_fill_arrays(yuv_frame->data, yuv_frame->linesize, buffer, AV_PIX_FMT_YUV420P,
codec_ctx->width, codec_ctx->height, 1);
SwsContext* img_convert_ctx = sws_getContext(
codec_ctx->width, codec_ctx->height, codec_ctx->pix_fmt,
codec_ctx->width, codec_ctx->height, AV_PIX_FMT_YUV420P,
SWS_BICUBIC,NULL, NULL, NULL);
int padding = 10;
initSDL(file_name, codec_ctx->width, codec_ctx->height, padding);
SDL_Thread* video_play_thread = SDL_CreateThread(decode_one_frame,NULL,NULL);
SDL_Event event;
while (true)
{
SDL_WaitEvent(&event);
if (event.type == UPDATE_ONE_FRAME)
{
cout << "接收到SDL 消息 UPDATE_ONE_FRAME" << endl;
if (av_read_frame(format_ctx, packet) >= 0)
{
if (packet->stream_index == video_stream_index)
{
is_video_index = 1;
avcodec_send_packet(codec_ctx, packet);
while (avcodec_receive_frame(codec_ctx, frame) >= 0)
{
sws_scale(img_convert_ctx, frame->data, frame->linesize, 0, codec_ctx->height,
yuv_frame->data, yuv_frame->linesize);
SDL_UpdateTexture(sdl_texture, NULL, yuv_frame->data[0], yuv_frame->linesize[0]);
SDL_RenderClear(sdl_render);
sdl_rect.x = padding;
sdl_rect.y = padding;
sdl_rect.w = codec_ctx->width;
sdl_rect.h = codec_ctx->height;
SDL_RenderCopy(sdl_render, sdl_texture, NULL, &sdl_rect);
SDL_RenderPresent(sdl_render);
}
av_packet_unref(packet);
}
else
{
is_video_index = 0;
}
}
}
else if (event.type == EXIT)
{
cout << "接收到SDL 消息 EXIT" << endl;
break;
}
else if (event.type == SDL_QUIT)
{
cout << "接收到SDL 消息 SDL_QUIT" << endl;
thread_exit = 1;
}
}
sws_freeContext(img_convert_ctx);
SDL_Quit();
av_frame_free(&yuv_frame);
av_frame_free(&frame);
avcodec_close(codec_ctx);
avformat_close_input(&format_ctx);
return 0;
}
|
