音视频技术(6)-iOS音视频同步

// 重采样，转换成ffmpeg能播放的采样率，还没理解这swr_convert的逻辑，while循环里后面的audio_buf不会把前面的冲掉么？
swr_convert(is->audio_swr_ctx,
                    &audio_buf,
                    MAX_AUDIO_FRAME_SIZE * 3/2,
                    (const uint8_t **) is->audio_frame.data,
                    is->audio_frame.nb_samples);

frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);

#include "SimplePlayer.h"
#include <stdio.h>
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavutil/time.h>
#include <libswresample/swresample.h>
#include <SDL.h>
#include <math.h>
#include <assert.h>
#include <SDL_main.h>
#import <VideoToolbox/VideoToolbox.h>
#import <AVFoundation/AVFoundation.h>
#import <GameController/GameController.h>
#import <CoreMotion/CoreMotion.h>

#define SDL_AUDIO_BUFFER_SIZE 1024
#define MAX_AUDIO_FRAME_SIZE 192000

// 没明白 5 * 16 * 1024 是怎么规定的
#define MAX_AUDIOQ_SIZE (5 * 16 * 1024)
#define MAX_VIDEOQ_SIZE (5 * 256 * 1024)

#define AV_SYNC_THRESHOLD 0.01
#define AV_NOSYNC_THRESHOLD 10.0

#define FF_REFRESH_EVENT (SDL_USEREVENT)
#define FF_QUIT_EVENT (SDL_USEREVENT + 1)

#define VIDEO_PICTURE_QUEUE_SIZE 1

typedef struct PacketQueue{
    AVPacketList *first_pkt, *last_pkt;
    int nb_packets;
    int size;
    SDL_mutex *mutex;
    SDL_cond *cond;
} PacketQueue;

typedef struct VideoPicture{
    AVFrame *frame;
    int width, height;
    double pts;
} VideoPicture;

typedef struct VideoState {
    char filename[1024];
    AVFormatContext *pFormatCtx;
    int videoStream, audioStream;
    
    double audio_clock;
    double frame_timer;
    double frame_last_pts;
    double frame_last_delay;
    
    double video_clock;
    double video_current_pts;
    int64_t video_current_pts_time;
    
    AVStream *audio_st;
    AVCodecContext *audio_ctx;
    PacketQueue audioq;
    uint8_t audio_buf[(MAX_AUDIO_FRAME_SIZE * 3)/2];
    unsigned int audio_buf_size;
    unsigned int audio_buf_index;
    AVFrame audio_frame;
    
    AVPacket audio_pkt;
    uint8_t *audio_pkt_data;
    int audio_pkt_size;
    int audio_hw_buf_size;
    struct SwrContext *audio_swr_ctx;
    
    AVStream *video_st;
    AVCodecContext *video_ctx;
    PacketQueue videoq;
    
    VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE];
    //rindex read_index 一般表示循环队列结尾处，
    //windex write_index 一般表示循环队列开始处，
    int pictq_size, pictq_rindex, pictq_windex;
    SDL_mutex *pictq_mutex;
    SDL_cond *pictq_cond;
    
    SDL_Thread *parse_tid;
    SDL_Thread *video_tid;
    
    int quit;
} VideoState;

char *file ;

SDL_mutex *text_mutex;
SDL_Window *win = NULL;
SDL_Renderer *renderer;
SDL_Texture *texture;


static int screen_left = SDL_WINDOWPOS_CENTERED;
static int screen_top = SDL_WINDOWPOS_CENTERED;
static int screen_width = 0;
static int screen_height = 0;
static int resize = 1;

VideoState *global_video_state;

//
//SDL_Event event;
//VideoState *is;
//

void packet_queue_init(PacketQueue *q){
    printf("\n");

    printf("packet_queue_init\n");
    memset(q, 0, sizeof(PacketQueue));
    q->mutex = SDL_CreateMutex();
    q->cond = SDL_CreateCond();
}

int packet_queue_put(PacketQueue *q, AVPacket *pkt){
//    printf("packet_queue_put\n");
    AVPacketList *pkt1;
    if (av_packet_make_refcounted(pkt) < 0){
        return -1;
    }
    pkt1 = av_malloc(sizeof(AVPacketList));
    if(!pkt1){
        return -1;
    }
    pkt1->pkt = *pkt;
    pkt1->next = NULL;
    
    SDL_LockMutex(q->mutex);
    
    if(!q->last_pkt){
        q->first_pkt = pkt1;
    } else {
        q->last_pkt->next = pkt1;
    }
    q->last_pkt = pkt1;
    q->nb_packets++;
    q->size += pkt1->pkt.size;
    SDL_CondSignal(q->cond);
    SDL_UnlockMutex(q->mutex);
    return 0;
}

int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block){
//    printf("packet_queue_get\n");
    AVPacketList *pkt1;
    int ret;
    
    SDL_LockMutex(q->mutex);
    for (;;) {
        if(global_video_state->quit){
            ret = -1;
            break;
        }
        
        pkt1 = q->first_pkt;
        if(pkt1){
            q->first_pkt = pkt1->next;
            if(!q->first_pkt){
                q->last_pkt = NULL;
            }
            q->nb_packets--;
            q->size -= pkt1->pkt.size;
            *pkt = pkt1->pkt;
            av_free(pkt1);
            ret = 1;
            break;
        } else if(!block){
            ret = 0;
            break;
        } else {
            SDL_CondWait(q->cond, q->mutex);
        }
    }
    SDL_UnlockMutex(q->mutex);
    return ret;
}

double get_audio_clock(VideoState *is){
    printf("\n");

    printf("get_audio_clock\n");
    double pts;
    int hw_buf_size, bytes_per_sec, n;
    
    pts = is->audio_clock;
    
    hw_buf_size = is->audio_buf_size - is->audio_buf_index;
    
    bytes_per_sec = 0;
    
    n = is->audio_ctx ->channels * 2;
    if(is->audio_st){
        bytes_per_sec = is->audio_ctx->sample_rate * n;
    }
    if(bytes_per_sec){
        pts -= (double)hw_buf_size / bytes_per_sec;
    }
    return pts;
}


int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size, double *pts_ptr){
    printf("audio_decode_frame\n");
    int len1, data_size = 0;
    AVPacket *pkt = &is->audio_pkt;
    double pts;
    int n;
    
    for (;;) {
        printf("audio_decode_frame---for\n");
        while (is->audio_pkt_size > 0) {
            // 打日志发现 send重复很多次，receive一般一次，而且swr_convert 一般一次，
            // 这里加while 逻辑可能是部分编码格式一次会receive多帧
            avcodec_send_packet(is->audio_ctx, pkt);
            printf("audio_decode_frame---send\n");
            while (avcodec_receive_frame(is->audio_ctx, &is->audio_frame) == 0) {
                printf("audio_decode_frame---receive\n");
                len1 = is->audio_frame.pkt_size;
                
                if(len1 < 0){
                    is->audio_pkt_size = 0;
                    printf("audio_decode_frame---break\n");
                    break;
                }
                
                data_size = 2 * is->audio_frame.nb_samples * 2;
                assert(data_size <= buf_size);
                
                // 重采样，转换成ffmpeg能播放的采样率，还没理解这swr_convert的逻辑，while循环里后面的audio_buf不会把前面的冲掉么？
                swr_convert(is->audio_swr_ctx,
                            &audio_buf,
                            MAX_AUDIO_FRAME_SIZE * 3/2,
                            (const uint8_t **) is->audio_frame.data,
                            is->audio_frame.nb_samples);
                printf("audio_decode_frame---swr_convert  audio_buf = %lu\n", sizeof(audio_buf));

            }
            is->audio_pkt_data += len1;
            is->audio_pkt_size -=len1;
            if(data_size <= 0){
                continue;
            }
            pts = is->audio_clock;
            *pts_ptr = pts;
            n = 2 * is->audio_ctx->channels;
            is->audio_clock += (double) data_size / (double)(n * is->audio_ctx -> sample_rate);
            return data_size;
        }
        
        if(pkt -> data){
            av_packet_unref(pkt);
        }
        
        if(is->quit){
            return -1;
        }
        
        if(packet_queue_get(&is->audioq, pkt, 1) < 0){
            return -1;
        }
        
        is->audio_pkt_data = pkt->data;
        is->audio_pkt_size = pkt->size;
        
        if(pkt->pts != AV_NOPTS_VALUE){
            is->audio_clock = av_q2d(is->audio_st->time_base) * pkt->pts;
        }
    }
}

void audio_callback(void *userdata, Uint8 *stream, int len){
    printf("\n");

    printf("audio_callback len = %d\n", len);
    VideoState *is = (VideoState *)userdata;
    int len1, audio_size;
    double pts;
    
    SDL_memset(stream, 0, len);
    
    while (len > 0) {
        if(is->audio_buf_index >= is->audio_buf_size){
            audio_size = audio_decode_frame(is, is->audio_buf, sizeof(is->audio_buf), &pts);
            if(audio_size < 0){
                printf("audio_callback error\n");
                is->audio_buf_size = 1024 * 2 * 2;
                memset(is->audio_buf, 0, is->audio_buf_size);
            } else {
                is->audio_buf_size = audio_size;
                printf("audio_callback audio_size %d\n", audio_size);
            }
            is->audio_buf_index = 0;
        }
        
        len1 = is->audio_buf_size - is->audio_buf_index;
        if(len1 > len){
            len1 = len;
        }
        
        SDL_MixAudio(stream, (uint8_t*) is->audio_buf + is->audio_buf_index, len1, SDL_MIX_MAXVOLUME);
        len -= len1;
        stream += len1;
        is->audio_buf_index += len1;
    }
}

static Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque){
    SDL_Event event;
    event.type = FF_REFRESH_EVENT;
    event.user.data1 = opaque;
    SDL_PushEvent(&event);
    return 0;
}

static void schedule_refresh(VideoState *is, int delay){
//    printf("schedule_refresh\n");
    SDL_AddTimer(delay, sdl_refresh_timer_cb, is);
}

void video_display(VideoState *is){
    printf("\n");

    printf("video_display\n");
    SDL_Rect rect;
    VideoPicture *vp;
    
    if(screen_width && resize){
        SDL_SetWindowSize(win, screen_width, screen_height);
        SDL_SetWindowPosition(win, screen_left, screen_top);
        SDL_ShowWindow(win);
        
        Uint32 pixformat = SDL_PIXELFORMAT_IYUV;
        
        texture = SDL_CreateTexture(renderer,
                                     pixformat,
                                     SDL_TEXTUREACCESS_STREAMING,
                                     screen_width,
                                     screen_height);
        resize = 0;
    }
    
    vp = &is->pictq[is->pictq_rindex];
    
    if(vp->frame){
        SDL_UpdateYUVTexture(texture, NULL,
                             vp->frame->data[0],vp->frame->linesize[0],
                             vp->frame->data[1],vp->frame->linesize[1],
                             vp->frame->data[2],vp->frame->linesize[2]);
        
    }
    rect.x = 0;
    rect.y = 0;
    rect.w = is->video_ctx->width;
    rect.h = is->video_ctx->height;
    SDL_LockMutex(text_mutex);
    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, texture, NULL, &rect);
    SDL_RenderPresent(renderer);
    SDL_UnlockMutex(text_mutex);
}


void video_refresh_timer(void *userdata){
//    printf("video_refresh_timer\n");
    VideoState *is = (VideoState *) userdata;
    VideoPicture *vp;
    double actual_delay, delay, sync_threshold, ref_clock, diff;
    
    if(is->video_st){
        if(is->pictq_size == 0){
            schedule_refresh(is, 1);
        } else {
            vp = &is->pictq[is->pictq_rindex];
            
            is->video_current_pts = vp->pts;
            is->video_current_pts_time = av_gettime();
            
            delay = vp->pts - is->frame_last_pts;
            if(delay <= 0 || delay >= 1.0){
                delay = is->frame_last_delay;
            }
            
            is->frame_last_delay = delay;
            is->frame_last_pts = vp->pts;
            
            ref_clock = get_audio_clock(is);
            
            diff = vp->pts - ref_clock;
            
            sync_threshold = (delay > AV_SYNC_THRESHOLD) ? delay : AV_SYNC_THRESHOLD;
            if(fabs(diff) < AV_NOSYNC_THRESHOLD){
                if(diff <= -sync_threshold){
                    delay = 0;
                } else if(diff >= sync_threshold){
                    delay = 2 * delay;
                }
            }
            
            is->frame_timer += delay;
            
            actual_delay = is->frame_timer - (av_gettime()/1000000.0);
            if(actual_delay < 0.010){
                actual_delay = 0.010;
            }
            
            schedule_refresh(is, (int)(actual_delay * 1000 + 0.5));
            
            video_display(is);
            
            if(++is->pictq_rindex == VIDEO_PICTURE_QUEUE_SIZE){
                is->pictq_rindex = 0;
            }
            
            SDL_LockMutex(is->pictq_mutex);
            is->pictq_size--;
            SDL_CondSignal(is->pictq_cond);
            SDL_UnlockMutex(is->pictq_mutex);
        }
    } else {
        schedule_refresh(is, 100);
    }
}

int queue_picture(VideoState *is, AVFrame *pFrame, double pts){
    printf("\n");

    printf("queue_picture\n");
    VideoPicture *vp;
    
    SDL_LockMutex(is->pictq_mutex);
    // VIDEO_PICTURE_QUEUE_SIZE  == 1 ，只有1帧，不做过多缓存，原因不明，可以尝试调大这个参数
    while (is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE && !is->quit) {
        SDL_CondWait(is->pictq_cond, is->pictq_mutex);
    }
    SDL_UnlockMutex(is->pictq_mutex);
    
    if(is->quit){
        return -1;
    }
    
    vp = &is->pictq[is->pictq_windex];
    
    if(!vp->frame ||
       vp->width != is->video_ctx->width ||
       vp->height != is->video_ctx->height){
        
        vp ->frame = av_frame_alloc();
        if(is->quit){
            return -1;
        }
    }
    
    if(vp->frame){
        vp->pts = pts;
        
        vp->frame = pFrame;
        
        if(++is->pictq_windex == VIDEO_PICTURE_QUEUE_SIZE){
            is->pictq_windex = 0;
        }
        
        SDL_LockMutex(is->pictq_mutex);
        is->pictq_size++;
        SDL_UnlockMutex(is->pictq_mutex);
    }
    return 0;
}

double synchronize_video(VideoState *is, AVFrame *src_frame, double pts){
    printf("\n");

    printf("synchronize_video\n");
    double frame_delay;
    if(pts != 0){
        is->video_clock = pts;
    } else {
        pts = is->video_clock;
    }
    
    frame_delay = av_q2d(is->video_ctx->time_base);
    
    frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);
    is->video_clock += frame_delay;
    return pts;
}


int decode_video_thread(void *arg){
    printf("\n");

    printf("decode_video_thread\n");
    VideoState *is = (VideoState *) arg;
    AVPacket pkt1, *packet = &pkt1;
    AVFrame *pFrame;
    double pts;
    
    pFrame = av_frame_alloc();
    
    for (;;) {
        if(packet_queue_get(&is->videoq, packet, 1)<0){
            break;
        }
        
        avcodec_send_packet(is->video_ctx, packet);
        while (avcodec_receive_frame(is->video_ctx, pFrame) == 0) {
            if((pts = pFrame->best_effort_timestamp) != AV_NOPTS_VALUE){
                
            } else {
                pts = 0;
            }
            
            pts *=av_q2d(is->video_st->time_base);
            
            pts = synchronize_video(is, pFrame, pts);
            if(queue_picture(is, pFrame, pts) < 0){
                break;
            }
            
            av_packet_unref(packet);
        }
    }
    av_frame_free(&pFrame);
    return 0;
}

int stream_component_open(VideoState *is, int stream_index){
    printf("\n");
    printf("stream_component_open index = %d\n", stream_index);
    AVFormatContext *pFormatCtx = is->pFormatCtx;
    AVCodecContext *codecCtx = NULL;
    AVCodec *codec = NULL;
    SDL_AudioSpec wanted_spec;
    
    if(stream_index < 0 || stream_index >= pFormatCtx->nb_streams){
        return -1;
    }
    codecCtx = avcodec_alloc_context3(NULL);
    int ret = avcodec_parameters_to_context(codecCtx, pFormatCtx->streams[stream_index]->codecpar);
    if(ret < 0){
        return -1;
    }
    
    codec = avcodec_find_decoder(codecCtx->codec_id);
    printf("codec_id = %d\n", codecCtx->codec_id);
    if(!codec){
        fprintf(stderr,"Unsupported codec!\n");
        return -1;
    }
    
    if(avcodec_open2(codecCtx, codec, NULL) < 0){
        fprintf(stderr, "Unsupported codec !\n");
    }
    
    switch (codecCtx->codec_type) {
        case AVMEDIA_TYPE_AUDIO:
            printf("stream_component_open----AUDIO\n");
            wanted_spec.freq = codecCtx->sample_rate;
            wanted_spec.format = AUDIO_S16SYS;
            wanted_spec.channels = 2;
            wanted_spec.silence = 0;
            wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
            wanted_spec.callback = audio_callback;
            wanted_spec.userdata = is;
            fprintf(stderr, "wanted spec: channels:%d, sample_fmt:%d, sample_rate:%d \n", 2, AUDIO_S16SYS, codecCtx->sample_rate);
            
            if(SDL_OpenAudio(&wanted_spec, NULL) < 0){
                fprintf(stderr, "SDL_OpenAudio:%s\n", SDL_GetError());
                return -1;
            }
            
            is->audioStream = stream_index;
            is->audio_st = pFormatCtx->streams[stream_index];
            is->audio_ctx = codecCtx;
            is->audio_buf_size = 0;
            
            is->audio_buf_index = 0;
            memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
            packet_queue_init(&is->audioq);
            uint64_t out_channel_layout = AV_CH_LAYOUT_STEREO;
            int out_nb_samples = is->audio_ctx->frame_size;
            
            int out_sample_rate = is->audio_ctx->sample_rate;
            int out_channels = av_get_channel_layout_nb_channels(out_channel_layout);
            
            int64_t in_channel_layout = av_get_default_channel_layout(is->audio_ctx->channels);
            
            struct SwrContext *audio_convert_ctx;
            audio_convert_ctx = swr_alloc();
            swr_alloc_set_opts(audio_convert_ctx,
                               out_channel_layout,
                               AV_SAMPLE_FMT_S16,
                               out_sample_rate,
                               in_channel_layout,
                               is->audio_ctx->sample_fmt,
                               is->audio_ctx->sample_rate,
                               0,
                               NULL);
            swr_init(audio_convert_ctx);
            is->audio_swr_ctx = audio_convert_ctx;
            
            SDL_PauseAudio(0);
            break;
        case AVMEDIA_TYPE_VIDEO:
            printf("stream_component_open----VIDEO\n");
            is->videoStream = stream_index;
            is->video_st = pFormatCtx->streams[stream_index];
            is->video_ctx = codecCtx;
            
            is->frame_timer = (double) av_gettime() / 1000000.0;
            // 初始化刷新值 40ms，应该就是经验值，没有特殊之处
            is->frame_last_delay = 40e-3;
            is->video_current_pts_time = av_gettime();
            
            packet_queue_init(&is->videoq);
            
            is->video_tid = SDL_CreateThread(decode_video_thread, "Decode_video_thread", is);
            break;
            
        default:
            break;
    }
    
    return 0;
}

//int err_code;
//char *errors;
//
//AVFormatContext *pFormatCtx;
//AVPacket *packet;

int demux_thread(void *arg){
    printf("\n");
    printf("demux_thread\n");
    int err_code;
    char errors[1024] = {0,};
    int w,h;
    VideoState *is = (VideoState *)arg;
    AVFormatContext *pFormatCtx = NULL;
    AVPacket pkt1, *packet = &pkt1;
    
    int video_index = -1;
    int audio_index = -1;
    int i;
    
    is->videoStream = -1;
    is->audioStream = -1;
    
    global_video_state = is;
    
    if((err_code = avformat_open_input(&pFormatCtx, is->filename, NULL, NULL)) < 0){
        av_strerror(err_code, errors, 1024);
        printf("Could not open source file %s, %d(%s)\n", is->filename, err_code, errors);
        return -1;
    }
    
    is->pFormatCtx = pFormatCtx;
    if(avformat_find_stream_info(pFormatCtx, NULL) < 0){
        return -1;
    }
//    av_dump_format(pFormatCtx, 0, is->filename, 0);
    
    for (i=0; i<pFormatCtx->nb_streams; i++) {
        if(pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && video_index < 0){
            video_index = i;
            printf("demux_thread video_index = %d\n", video_index);
        }
        if(pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && audio_index < 0){
            audio_index = i;
            printf("demux_thread audio_index = %d\n", audio_index);
        }
    }
    if(audio_index >= 0){
        printf("demux_thread open audio-----\n");
        stream_component_open(is, audio_index);
    }
    if(video_index >= 0){
        printf("demux_thread open video----\n");
        stream_component_open(is, video_index);
    }
    
    if(is->videoStream < 0 || is->audioStream < 0){
        printf("%s:could not open codecs\n", is->filename);
        goto fail;
    }
    
    screen_width = is->video_ctx->width;
    screen_height = is->video_ctx->height;
    
    for (;;) {
        if(is->quit){
            break;
        }
        
        if(is->audioq.size > MAX_AUDIOQ_SIZE ||
           is->videoq.size > MAX_VIDEOQ_SIZE){
            SDL_Delay(10);
            continue;
        }
        
        if(av_read_frame(is->pFormatCtx, packet) < 0){
            if(is->pFormatCtx->pb->error == 0){
                SDL_Delay(100);
                continue;
            } else {
                break;
            }
        }
        
        if(packet->stream_index == is->videoStream){
            packet_queue_put(&is->videoq, packet);
        } else if(packet->stream_index == is->audioStream){
            packet_queue_put(&is->audioq, packet);
        } else {
            av_packet_unref(packet);
        }
    }
    while (!is->quit) {
        SDL_Delay(100);
    }
    
fail:
    if(1){
        SDL_Event event;
        event.type = FF_QUIT_EVENT;
        event.user.data1 = is;
        SDL_PushEvent(&event);
    }
    return 0;
    
}


int WinMain(){
    printf("\n");

    SDL_Event event;
    VideoState *is;
    
    NSString *mp4file = [NSString stringWithFormat:@"resource.bundle/sintel.mov"];
    NSString *mp4pth = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:mp4file];
    file = [mp4pth UTF8String];
    printf("winmain--start\n");
    is = av_mallocz(sizeof(VideoState));
    
    SDL_SetMainReady();
    if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)){
        fprintf(stderr, "Could not initialize SDL -%s\n", SDL_GetError());
        exit(1);
    }

    win = SDL_CreateWindow("Media",
                           100,100,
                           640,480,
                           SDL_WINDOW_RESIZABLE);
    printf("create window\n");
    
    if(!win){
        fprintf(stderr, "SDL_CreateWindow error, exit! -%s", SDL_GetError());
        exit(1);
    }
    
    renderer = SDL_CreateRenderer(win, -1, 0);
    text_mutex = SDL_CreateMutex();
    strlcpy(is->filename, file, sizeof(is->filename));
    is->pictq_mutex = SDL_CreateMutex();
    is->pictq_cond = SDL_CreateCond();
    
    schedule_refresh(is, 40);
    
    is->parse_tid = SDL_CreateThread(demux_thread, "demux_thread", is);
    if(!is->parse_tid){
        av_free(is);
        return -1;
    }
    
    for (; ;) {
        SDL_WaitEvent(&event);
        switch (event.type) {
            case FF_QUIT_EVENT:
            case SDL_QUIT:
                is->quit = 1;
                goto Destroy;
                break;
            case SDL_KEYDOWN:
                break;
            case FF_REFRESH_EVENT:
                video_refresh_timer(event.user.data1);
                break;
            default:
                break;
        }
    }
    
    Destroy:
    SDL_Quit();
    
    printf("end \n");
    return 0;
}