这部分内容较多，涉及多个线程协同实现“解复用”、“解音频帧”、“解视频”、“音频&视频渲染”，前后研究了两周多，还有些代码没理解为什么这么写。
盗用一张@MzDavid画的图，逻辑很清楚
音视频同步播放流程
网上绝大多数代码都是参照ffplay来实现的，下面按照接入流程一步步讲解如何实现iOS平台上音视频同步
- iOS接入ffmpeg和SDL可以参考前面的文章，本文不做赘述。main函数里做初始化VideoState（上下文）、SDL和开启线程的工作，新版本的ffmpeg已经不需要再av_regist_all这样的调用了，VideoState可以理解为存储各种临时信息和上下文的结构体，包括各线程处理的数据也存在VideoState里，避免各个线程之间直接的调用，VideoState起到状态机的作用，解耦各线程的工作。 详细的代码在文章结尾有贴出来 main函数里：
- 创建demux_thread(解复用线程)
- 触发一次延时渲染视频帧的任务 schedule_refresh(is, 40); （后面在视频帧渲染里自己持续发消息触发自己渲染，直到没有更多视频帧或者出错）
- 解复用(或者说解封装，解包) 打开文件 & 读取文件的媒体信息 --> 开启子线程解具体的每一帧(取包的时候，如果没有会等待解复用) --> for循环中不断的读每一帧 --> 队列里存放packet
解复用流程
- 打开流 这一步按流程可以整合到解复用中，但是涉及到音频和视频解复用的部分有重复的代码，从代码结构设计上抽象出来是合理的。 另外，在这一步开启了音频硬件准备和读取的线程(SDL_PauseAudio，这个方法会在合适时机，以回调的方式获取音频帧并渲染) 。 同时，打开了新的线程解析视频帧(decode_video_thread，把解析的视频帧入到VideoState的队列中)
打开流并解析音视频帧
代码语言：javascript复制注意几点 1.新版本ffmpeg里，新增api,avcodec_parameters_to_context(...)用来获取解码参数 2.新的解码方法，和渲染的api不兼容，需要重采样处理，使用API:swr_convert，这里代码有一点没明白，// 重采样，转换成ffmpeg能播放的采样率，还没理解swr_convert的逻辑，while循环里后面的audio_buf不会把前面的冲掉么？
// 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);- 视频解码 注意两点：
- 新版ffmpeg的API，和老的ffmpeg不同，使用avcode_send_packet和avcode_receive_frame成对使用，而且一个send可能对应多个receive，所以使用while循环多次调用receive，笔者打日志发现实际情况恰恰相反，一开始有多个send调用，而receive只有单次调用(费解)。
- 视频解码需要将pts自然数转成秒值，以和音频同步，音视频同步有多种方法，基于人对声音比较敏感，一般采用视频同步到音频。
- synchronize_video,生成视频PTS 这一步，还没彻底弄明白 分两步：1)pts转换成ms值，作为渲染的delay值，如果该视频帧有重复，即画面没有变化，则要加上一个额外的delay值，如下代码所示，重复的次数 * 单帧时间，没明白的是为什么要 * 0.5呢？可能是经验？费解。
frame_delay = src_frame->repeat_pict * (frame_delay * 0.5);- 视频帧队列处理 比较简单，入队列的操作，有一点不确定的是 VIDEO_PICTURE_QUEUE_SIZE值是1，队列里始终只有1帧，有视频帧就等待，等待这一帧被消费了之后才放进来，这个队列有什么意义呢？可能也能设置成任意值，看开发者的使用场景吧，不过这里时间关系（懒惰），笔者没有去试着改这个数
- video_refresh_timer，视频刷新 这步稍微复杂点，通过对比音频帧时间戳，来动态调整视频的下次刷新时机
生成下次视频帧渲染时间
sync_threshold的计算
- 剩下的非核心代码逻辑，可以参考前面音频 和 视频渲染讲解，没有复杂之处 本篇文章花的时间较长，反复研读代码才基本明白是怎么回事，想要再进一步理解，还得去读ffmpeg的源码实现，当前阶段先不做深入了解，比这更重要的是把整个音视频处理大的流程和基本原理磕清楚，后面再回过头找价值高的地方深入进去。
音视频处理确实涉及的技术比较深，与笔者当前的工作并不match，只能在不多的休息时间里再挤一点时间，日拱一卒去学习钻研，加油。
9.完整代码
代码语言：javascript复制#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_initn");
memset(q, 0, sizeof(PacketQueue));
q->mutex = SDL_CreateMutex();
q->cond = SDL_CreateCond();
}
int packet_queue_put(PacketQueue *q, AVPacket *pkt){
// printf("packet_queue_putn");
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_getn");
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_clockn");
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_framen");
int len1, data_size = 0;
AVPacket *pkt = &is->audio_pkt;
double pts;
int n;
for (;;) {
printf("audio_decode_frame---forn");
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---sendn");
while (avcodec_receive_frame(is->audio_ctx, &is->audio_frame) == 0) {
printf("audio_decode_frame---receiven");
len1 = is->audio_frame.pkt_size;
if(len1 < 0){
is->audio_pkt_size = 0;
printf("audio_decode_frame---breakn");
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 = %lun", 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 = %dn", 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 errorn");
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 %dn", 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_refreshn");
SDL_AddTimer(delay, sdl_refresh_timer_cb, is);
}
void video_display(VideoState *is){
printf("n");
printf("video_displayn");
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_timern");
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_picturen");
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_videon");
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_threadn");
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 = %dn", 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 = %dn", 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----AUDIOn");
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:%sn", 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----VIDEOn");
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_threadn");
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 = %dn", video_index);
}
if(pFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && audio_index < 0){
audio_index = i;
printf("demux_thread audio_index = %dn", 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 codecsn", 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--startn");
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 -%sn", SDL_GetError());
exit(1);
}
win = SDL_CreateWindow("Media",
100,100,
640,480,
SDL_WINDOW_RESIZABLE);
printf("create windown");
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;
}
