FFMPEG教程6_同步音频(使用2014年新SDK重新整理编译通过）
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龚希鹏 2014.10.1修改 使用更新后的FFMPEG和SDL2.0
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#include "stdafx.h"#include <math.h>#include <Windows.h>#pragma warning( disable : 4312 ) #pragma warning( disable : 4244 ) #pragma warning( disable : 4311 ) #ifdef __cplusplus extern "C" { #endif #include <libavcodec/avcodec.h> #include <libavformat/avformat.h> #include <libavutil/avutil.h> #include <libswscale/swscale.h> #include <libavutil/avstring.h> #include <SDL/SDL.h> #include <SDL/SDL_video.h> // SDL#include <SDL/SDL_thread.h> // SDL#ifdef __cplusplus } #endif #pragma comment( lib, "libgcc.a") #pragma comment( lib, "libmingwex.a") #pragma comment( lib, "libcoldname.a") #pragma comment( lib, "libavcodec.a") #pragma comment( lib, "libavformat.a") #pragma comment( lib, "libavutil.a") #pragma comment( lib, "libswscale.a") #pragma comment( lib, "libz.a") #pragma comment( lib, "libfaac.a") #pragma comment( lib, "libgsm.a") #pragma comment( lib, "libmp3lame.a") #pragma comment( lib, "libogg.a") #pragma comment( lib, "libspeex.a") #pragma comment( lib, "libtheora.a") #pragma comment( lib, "libvorbis.a") #pragma comment( lib, "libvorbisenc.a") #pragma comment( lib, "libx264.a") #pragma comment( lib, "xvidcore.a") #pragma comment( lib, "wsock32.lib") #pragma comment( lib, "vfw32.lib") #pragma comment( lib, "sdl2main.lib") #pragma comment( lib, "sdl2.lib") #pragma comment(lib, "winmm.lib ")#pragma comment(lib,"Version.lib") #pragma comment(lib,"imm32.lib") #ifdef __MINGW32__#undef main /* Prevents SDL from overriding main() */#endif#define SDL_AUDIO_BUFFER_SIZE 1024#define MAX_AUDIO_FRAME_SIZE 192000#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 SAMPLE_CORRECTION_PERCENT_MAX 10#define AUDIO_DIFF_AVG_NB 20#define FF_ALLOC_EVENT (SDL_USEREVENT)#define FF_REFRESH_EVENT (SDL_USEREVENT + 1)#define FF_QUIT_EVENT (SDL_USEREVENT + 2)#define VIDEO_PICTURE_QUEUE_SIZE 1#define DEFAULT_AV_SYNC_TYPE AV_SYNC_VIDEO_MASTERtypedef struct VideoPicture { AVFrame* rawdata; int width, height; /* source height & width */ int allocated;double pts;SDL_Texture* texture;} VideoPicture;typedef struct PacketQueue { AVPacketList *first_pkt, *last_pkt; int nb_packets; int size; SDL_mutex *mutex; SDL_cond *cond;} PacketQueue;typedef struct VideoState { AVFormatContext *pFormatCtx; int videoStream, audioStream; int av_sync_type; double external_clock; /* external clock base */ int64_t external_clock_time;double audio_clock;AVStream *audio_st; 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; double audio_diff_cum; /* used for AV difference average computation */ double audio_diff_avg_coef; double audio_diff_threshold; int audio_diff_avg_count; double frame_timer;double frame_last_pts;double frame_last_delay;double video_clock; ///<pts of last decoded frame / predicted pts of next decoded framedouble video_current_pts; ///<current displayed pts (different from video_clock if frame fifos are used) int64_t video_current_pts_time; ///<time (av_gettime) at which we updated video_current_pts - used to have running video ptsAVStream *video_st; PacketQueue videoq; VideoPicture pictq[VIDEO_PICTURE_QUEUE_SIZE]; int pictq_size, pictq_rindex, pictq_windex; SDL_mutex *pictq_mutex; SDL_cond *pictq_cond; SDL_Thread *parse_tid; SDL_Thread *video_tid; char filename[1024]; int quit; AVIOContext *io_context; struct SwsContext *sws_ctx;struct SDL_Window *pScreen;} VideoState;enum { AV_SYNC_AUDIO_MASTER, AV_SYNC_VIDEO_MASTER, AV_SYNC_EXTERNAL_MASTER,};/* Since we only have one decoding thread, the Big Struct can be global in case we need it. */VideoState *global_video_state;//PacketQueue audioq;//int quit = 0;void packet_queue_init(PacketQueue *q) { memset(q, 0, sizeof(PacketQueue)); q->mutex = SDL_CreateMutex(); q->cond = SDL_CreateCond();}int packet_queue_put(PacketQueue *q, AVPacket *pkt) { AVPacketList *pkt1; if(av_dup_packet(pkt) < 0) { return -1; } pkt1 = (AVPacketList *)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;}static int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block){ 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) { double pts; int hw_buf_size, bytes_per_sec, n; pts = is->audio_clock; /* maintained in the audio thread */ hw_buf_size = is->audio_buf_size - is->audio_buf_index; bytes_per_sec = 0; n = is->audio_st->codec->channels * 2; if(is->audio_st) { bytes_per_sec = is->audio_st->codec->sample_rate * n; } if(bytes_per_sec) { pts -= (double)hw_buf_size / bytes_per_sec; } return pts;}double get_video_clock(VideoState *is) { double delta; delta = (av_gettime() - is->video_current_pts_time) / 1000000.0; return is->video_current_pts + delta;}double get_external_clock(VideoState *is) { return av_gettime() / 1000000.0;}double get_master_clock(VideoState *is) { if(is->av_sync_type == AV_SYNC_VIDEO_MASTER) { return get_video_clock(is); } else if(is->av_sync_type == AV_SYNC_AUDIO_MASTER) { return get_audio_clock(is); } else { return get_external_clock(is); }}/* Add or subtract samples to get a better sync, return new audio buffer size */int synchronize_audio(VideoState *is, short *samples, int samples_size, double pts) { int n; double ref_clock; n = 2 * is->audio_st->codec->channels; if(is->av_sync_type != AV_SYNC_AUDIO_MASTER) { double diff, avg_diff; int wanted_size, min_size, max_size;// nb_samples; ref_clock = get_master_clock(is); diff = get_audio_clock(is) - ref_clock; if(diff < AV_NOSYNC_THRESHOLD) { // accumulate the diffs is->audio_diff_cum = diff + is->audio_diff_avg_coef* is->audio_diff_cum; if(is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) {is->audio_diff_avg_count++; } else {avg_diff = is->audio_diff_cum * (1.0 - is->audio_diff_avg_coef);if(fabs(avg_diff) >= is->audio_diff_threshold) { wanted_size = samples_size + ((int)(diff * is->audio_st->codec->sample_rate) * n); min_size = samples_size * ((100 - SAMPLE_CORRECTION_PERCENT_MAX) / 100); max_size = samples_size * ((100 + SAMPLE_CORRECTION_PERCENT_MAX) / 100); if(wanted_size < min_size) { wanted_size = min_size; } else if (wanted_size > max_size) { wanted_size = max_size; } if(wanted_size < samples_size) { /* remove samples */ samples_size = wanted_size; } else if(wanted_size > samples_size) { uint8_t *samples_end, *q; int nb; /* add samples by copying final sample*/ nb = (samples_size - wanted_size); samples_end = (uint8_t *)samples + samples_size - n; q = samples_end + n; while(nb > 0) { memcpy(q, samples_end, n); q += n; nb -= n; } samples_size = wanted_size; }} } } else { /* difference is TOO big; reset diff stuff */ is->audio_diff_avg_count = 0; is->audio_diff_cum = 0; } } return samples_size;}//int audio_decode_frame(VideoState *is, uint8_t *audio_buf, int buf_size, double *pts_ptr)//int audio_decode_frame(VideoState *is) {int audio_decode_frame(VideoState *is,double *pts_ptr) { int len1, data_size = 0,n; AVPacket *pkt = &is->audio_pkt; double pts; for(;;) { while(is->audio_pkt_size > 0) { int got_frame = 0; len1 = avcodec_decode_audio4(is->audio_st->codec, &is->audio_frame, &got_frame, pkt); if(len1 < 0) { /* if error, skip frame */ is->audio_pkt_size = 0; break; } if (got_frame) { data_size = av_samples_get_buffer_size ( NULL, is->audio_st->codec->channels, is->audio_frame.nb_samples, is->audio_st->codec->sample_fmt, 1 ); memcpy(is->audio_buf, is->audio_frame.data[0], data_size); } is->audio_pkt_data += len1; is->audio_pkt_size -= len1; if(data_size <= 0) { /* No data yet, get more frames */ continue; } /* We have data, return it and come back for more later */pts = is->audio_clock;*pts_ptr = pts;n = 2 * is->audio_st->codec->channels;is->audio_clock += (double)data_size /(double)(n * is->audio_st->codec->sample_rate);return data_size; } if(pkt->data) av_free_packet(pkt); if(is->quit) { return -1; } /* next packet */ 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) { VideoState *is = (VideoState *)userdata; int len1, audio_size; double pts; //这个为SDL2.0增加 ，gongxp 2014注释 SDL_memset(stream, 0, len); while(len > 0) { if(is->audio_buf_index >= is->audio_buf_size) { /* We have already sent all our data; get more */ audio_size = audio_decode_frame(is,&pts); if(audio_size < 0) { /* If error, output silence */ is->audio_buf_size = 1024; memset(is->audio_buf, 0, is->audio_buf_size); } else {audio_size = synchronize_audio(is, (int16_t *)is->audio_buf,audio_size, pts); is->audio_buf_size = audio_size; } is->audio_buf_index = 0; } len1 = is->audio_buf_size - is->audio_buf_index; if(len1 > len) len1 = len; memcpy(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1); 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; /* 0 means stop timer */}/* schedule a video refresh in 'delay' ms */static void schedule_refresh(VideoState *is, int delay) { SDL_AddTimer(delay, sdl_refresh_timer_cb, is);}void video_display(VideoState *is,SDL_Renderer* renderer,SDL_Texture* texture) { SDL_Rect rect; VideoPicture *vp; //AVPicture pict; float aspect_ratio; //int w=0, h=0, x=0, y=0; //screen->w; //int i; //renderer->w; vp = &is->pictq[is->pictq_rindex]; if(vp->rawdata) { if(is->video_st->codec->sample_aspect_ratio.num == 0) { aspect_ratio = 0; } else { aspect_ratio = av_q2d(is->video_st->codec->sample_aspect_ratio) * is->video_st->codec->width / is->video_st->codec->height; } if(aspect_ratio <= 0.0) { aspect_ratio = (float)is->video_st->codec->width / (float)is->video_st->codec->height; } //screen->h;// h = screen->h;// w = ((int)rint(h * aspect_ratio)) & -3;// if(w > screen->w) {// w = screen->w;// h = ((int)rint(w / aspect_ratio)) & -3;// }// x = (screen->w - w) / 2;// y = (screen->h - h) / 2; rect.x = 0; rect.y = 0; rect.w = vp->width; rect.h = vp->height; //SDL_SetRenderDrawColor(renderer, 120, 0, 0, 255); //SDL_RenderFillRect(renderer, &rect); //设置窗口大小和视频一样大SDL_SetWindowSize(is->pScreen,vp->width, vp->height); SDL_UpdateTexture( texture, &rect, vp->rawdata->data[0], vp->rawdata->linesize[0] ); SDL_RenderClear( renderer ); SDL_RenderCopy( renderer,texture , &rect, &rect ); SDL_RenderPresent( renderer ); //SDL_DisplayYUVOverlay(vp->bmp, &rect); }}void video_refresh_timer(void *userdata,SDL_Renderer* renderer) { VideoState *is = (VideoState *)userdata; // vp is used in later tutorials for synchronization VideoPicture *vp = &is->pictq[is->pictq_windex];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]; /* Now, normally here goes a ton of code about timing, etc. we're just going to guess at a delay for now. You can increase and decrease this value and hard code the timing - but I don't suggest that ;) We'll learn how to do it for real later. schedule_refresh(is, 30);*/is->video_current_pts = vp->pts;is->video_current_pts_time = av_gettime();delay = vp->pts - is->frame_last_pts; /* the pts from last time */if(delay <= 0 || delay >= 1.0) {/* if incorrect delay, use previous one */delay = is->frame_last_delay;}/* save for next time */is->frame_last_delay = delay;is->frame_last_pts = vp->pts;if(is->av_sync_type != AV_SYNC_VIDEO_MASTER) {/* update delay to sync to audio */ref_clock = get_audio_clock(is);diff = vp->pts - ref_clock;/* Skip or repeat the frame. Take delay into accountFFPlay still doesn't "know if this is the best guess." */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;/* computer the REAL delay */actual_delay = is->frame_timer - (av_gettime() / 1000000.0);if(actual_delay < 0.010) {/* Really it should skip the picture instead */actual_delay = 0.010;}schedule_refresh(is, (int)(actual_delay * 1000 + 0.5)); /* show the picture! */video_display(is,renderer,vp->texture); /* update queue for next picture! */ 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); }}void alloc_picture(void *userdata,SDL_Renderer* renderer) { VideoState *is = (VideoState *)userdata; VideoPicture *vp; vp = &is->pictq[is->pictq_windex]; if(vp->rawdata) { av_free(vp->rawdata); } vp->width = is->video_st->codec->width; vp->height = is->video_st->codec->height; //if(vp->texture)SDL_DestroyTexture(vp->texture);//else vp->texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, vp->width, vp->height); AVCodecContext *pCodecCtx = NULL; pCodecCtx = is->video_st->codec; AVFrame* pFrameYUV = avcodec_alloc_frame(); if( pFrameYUV == NULL ) return; int numBytes = avpicture_get_size(PIX_FMT_YUV420P, pCodecCtx->width,pCodecCtx->height); uint8_t* buffer = (uint8_t *)av_malloc(numBytes*sizeof(uint8_t)); avpicture_fill((AVPicture *)pFrameYUV, buffer, PIX_FMT_YUV420P,pCodecCtx->width, pCodecCtx->height); vp->rawdata = pFrameYUV; if(vp->texture)SDL_DestroyTexture(vp->texture);else vp->texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, vp->width, vp->height); SDL_LockMutex(is->pictq_mutex); vp->allocated = 1; SDL_CondSignal(is->pictq_cond); SDL_UnlockMutex(is->pictq_mutex); }int queue_picture(VideoState *is, AVFrame *pFrame, double pts){ //int queue_picture(VideoState *is, AVFrame *pFrame) { VideoPicture *vp; //AVCodecContext *pCodecCtx; /* wait until we have space for a new pic */ SDL_LockMutex(is->pictq_mutex); 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; // windex is set to 0 initially vp = &is->pictq[is->pictq_windex]; /* allocate or resize the buffer! */ if(!vp->rawdata || vp->width != is->video_st->codec->width || vp->height != is->video_st->codec->height) { SDL_Event event; vp->allocated = 0; /* we have to do it in the main thread */ event.type = FF_ALLOC_EVENT; event.user.data1 = is; SDL_PushEvent(&event); /* wait until we have a picture allocated */ SDL_LockMutex(is->pictq_mutex); while(!vp->allocated && !is->quit) { SDL_CondWait(is->pictq_cond, is->pictq_mutex); } SDL_UnlockMutex(is->pictq_mutex); if(is->quit) { return -1; } } /* We have a place to put our picture on the queue */ if(vp->rawdata) { //SDL_LockYUVOverlay(vp->bmp); /* point pict at the queue */ // pict.data[0] = vp->bmp->pixels[0];// pict.data[1] = vp->bmp->pixels[2];// pict.data[2] = vp->bmp->pixels[1];// // pict.linesize[0] = vp->bmp->pitches[0];// pict.linesize[1] = vp->bmp->pitches[2];// pict.linesize[2] = vp->bmp->pitches[1]; // Convert the image into YUV format that SDL uses sws_scale(is->sws_ctx, (uint8_t const * const *)pFrame->data,pFrame->linesize,0, is->video_st->codec->height,vp->rawdata->data,vp->rawdata->linesize);// SDL_Rect rect;// rect.x = 0;// rect.y = 0;// rect.w = vp->width;// rect.h = vp->height; //printf("%d,%d\n",rect.w,rect.h); //SDL_UpdateTexture( vp->texture, &rect, pFrameYUV->data[0], pFrameYUV->linesize[0] ); //av_free(pFrameYUV); //SDL_UnlockYUVOverlay(vp->bmp); vp->pts = pts;/* now we inform our display thread that we have a pic ready */ 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) { double frame_delay; if(pts != 0) { /* if we have pts, set video clock to it */ is->video_clock = pts; } else { /* if we aren't given a pts, set it to the clock */ pts = is->video_clock; } /* update the video clock */ frame_delay = av_q2d(is->video_st->codec->time_base); /* if we are repeating a frame, adjust clock accordingly */ frame_delay += src_frame->repeat_pict * (frame_delay * 0.5); is->video_clock += frame_delay; return pts;}uint64_t global_video_pkt_pts = AV_NOPTS_VALUE;/* These are called whenever we allocate a frame * buffer. We use this to store the global_pts in * a frame at the time it is allocated. */int our_get_buffer(struct AVCodecContext *c, AVFrame *pic) { int ret = avcodec_default_get_buffer(c, pic); uint64_t *pts = (uint64_t *)av_malloc(sizeof(uint64_t)); *pts = global_video_pkt_pts; pic->opaque = pts; return ret;}void our_release_buffer(struct AVCodecContext *c, AVFrame *pic) { if(pic) av_freep(&pic->opaque); avcodec_default_release_buffer(c, pic);}int video_thread(void *arg) { VideoState *is = (VideoState *)arg; AVPacket pkt1, *packet = &pkt1; int frameFinished; AVFrame *pFrame; double pts; pFrame = avcodec_alloc_frame(); for(;;) { if(packet_queue_get(&is->videoq, packet, 1) < 0) { // means we quit getting packets break; }pts = 0;// Save global pts to be stored in pFrame in first callglobal_video_pkt_pts = packet->pts; // Decode video frame avcodec_decode_video2(is->video_st->codec, pFrame, &frameFinished,packet); if(packet->dts == AV_NOPTS_VALUE && pFrame->opaque && *(uint64_t*)pFrame->opaque != AV_NOPTS_VALUE) {pts = *(uint64_t *)pFrame->opaque;} else if(packet->dts != AV_NOPTS_VALUE) {pts = packet->dts;} else {pts = 0;}pts *= av_q2d(is->video_st->time_base); // Did we get a video frame? if(frameFinished) { pts = synchronize_video(is, pFrame, pts);//printf("video_thread\n"); if(queue_picture(is, pFrame,pts) < 0) { break; } } av_free_packet(packet); } av_free(pFrame); return 0;}int stream_component_open(VideoState *is, int stream_index) { AVFormatContext *pFormatCtx = is->pFormatCtx; AVCodecContext *codecCtx = NULL; AVCodec *codec = NULL; AVDictionary *optionsDict = NULL; SDL_AudioSpec wanted_spec, spec; if(stream_index < 0 || stream_index >= (int)pFormatCtx->nb_streams) { return -1; } codecCtx = pFormatCtx->streams[stream_index]->codec; if(codecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {wanted_spec.freq = codecCtx->sample_rate; wanted_spec.format = AUDIO_S16SYS; wanted_spec.channels = codecCtx->channels; wanted_spec.silence = 0; wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE; wanted_spec.callback = audio_callback; wanted_spec.userdata = is; if(SDL_OpenAudio(&wanted_spec, &spec) < 0) { fprintf(stderr, "SDL_OpenAudio 失败: %s\n\n", SDL_GetError()); return -1; }is->audio_hw_buf_size = spec.size; } codec = avcodec_find_decoder(codecCtx->codec_id); if(!codec || (avcodec_open2(codecCtx, codec, &optionsDict) < 0)) { fprintf(stderr, "Unsupported codec!\n"); return -1; } switch(codecCtx->codec_type) { case AVMEDIA_TYPE_AUDIO: is->audioStream = stream_index; is->audio_st = pFormatCtx->streams[stream_index]; is->audio_buf_size = 0; is->audio_buf_index = 0;/* averaging filter for audio sync */is->audio_diff_avg_coef = exp(log(0.01 / AUDIO_DIFF_AVG_NB));is->audio_diff_avg_count = 0;/* Correct audio only if larger error than this */is->audio_diff_threshold = 2.0 * SDL_AUDIO_BUFFER_SIZE / codecCtx->sample_rate; memset(&is->audio_pkt, 0, sizeof(is->audio_pkt)); packet_queue_init(&is->audioq); SDL_PauseAudio(0); break; case AVMEDIA_TYPE_VIDEO: is->videoStream = stream_index; is->video_st = pFormatCtx->streams[stream_index]; is->frame_timer = (double)av_gettime() / 1000000.0;is->frame_last_delay = 40e-3;is->video_current_pts_time = av_gettime(); packet_queue_init(&is->videoq); is->video_tid = SDL_CreateThread(video_thread, "video_thread",is); is->sws_ctx = sws_getContext(is->video_st->codec->width,is->video_st->codec->height,is->video_st->codec->pix_fmt,is->video_st->codec->width,is->video_st->codec->height,PIX_FMT_YUV420P,SWS_BILINEAR,NULL,NULL,NULL);codecCtx->get_buffer = our_get_buffer;codecCtx->release_buffer = our_release_buffer; break; default: break; } return 0;}int decode_interrupt_cb(void *opaque) { return (global_video_state && global_video_state->quit);}int decode_thread(void *arg) { VideoState *is = (VideoState *)arg; AVFormatContext *pFormatCtx = NULL; AVPacket pkt1, *packet = &pkt1; int video_index = -1; int audio_index = -1; int i; AVDictionary *io_dict = NULL; AVIOInterruptCB callback; is->videoStream=-1; is->audioStream=-1;if(SDL_Init( SDL_INIT_AUDIO)) {fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError());exit(1);}//SDL_RenderSetViewport(ctx.renderer, NULL ); //ctx.displayrect.w = ctx.window_w = event.window.data1; //ctx.displayrect.h = ctx.window_h = event.window.data2; global_video_state = is; // will interrupt blocking functions if we quit! callback.callback = decode_interrupt_cb; callback.opaque = is; if (avio_open2(&is->io_context, is->filename, 0, &callback, &io_dict)) { fprintf(stderr, "Unable to open I/O for %s\n", is->filename); return -1; } // Open video file if(avformat_open_input(&pFormatCtx, is->filename, NULL, NULL)!=0) return -1; // Couldn't open file is->pFormatCtx = pFormatCtx; // Retrieve stream information if(avformat_find_stream_info(pFormatCtx, NULL)<0) return -1; // Couldn't find stream information // Dump information about file onto standard error av_dump_format(pFormatCtx, 0, is->filename, 0); // Find the first video stream for(i=0; i<(int)pFormatCtx->nb_streams; i++) { if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO && video_index < 0) { video_index=i; } if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO && audio_index < 0) { audio_index=i; } } if(audio_index >= 0) { stream_component_open(is, audio_index); } if(video_index >= 0) { stream_component_open(is, video_index); } if(is->videoStream < 0 || is->audioStream < 0) { fprintf(stderr, "%s: could not open codecs\n", is->filename); goto fail; } // main decode loop for(;;) { if(is->quit) { break; } // seek stuff goes here 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); /* no error; wait for user input */ continue; } else { break; } } // Is this a packet from the video stream? 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_free_packet(packet); } } /* all done - wait for it */ 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 _tmain(int argc, _TCHAR* argv[]){ SDL_Event event; VideoState *is; struct SDL_Window *pScreen; struct SDL_Renderer *pRenderer; is = (VideoState *)av_mallocz(sizeof(VideoState)); memset(is,0,sizeof(VideoState)); if(argc < 2) { fprintf(stderr, "Usage: test <file>\n"); exit(1); } // Register all formats and codecs av_register_all(); //if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) { if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER)) {fprintf(stderr, "Could not initialize SDL - %s\n", SDL_GetError()); exit(1); } pScreen = SDL_CreateWindow("audio & video", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640,480, SDL_WINDOW_OPENGL); if(!pScreen) { fprintf(stderr, "SDL: could not set video mode - exiting\n"); exit(1); } pRenderer = SDL_CreateRenderer(pScreen, -1, 0);is->pScreen = pScreen; SDL_Texture* texture = SDL_CreateTexture(pRenderer, SDL_PIXELFORMAT_IYUV, SDL_TEXTUREACCESS_STREAMING, 649, 480); av_strlcpy(is->filename, argv[1], 1024); is->pictq_mutex = SDL_CreateMutex(); is->pictq_cond = SDL_CreateCond(); schedule_refresh(is, 40); is->av_sync_type = DEFAULT_AV_SYNC_TYPE; is->parse_tid = SDL_CreateThread(decode_thread,"parse_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; /* * If the video has finished playing, then both the picture and * audio queues are waiting for more data. Make them stop * waiting and terminate normally. */ SDL_CondSignal(is->audioq.cond); SDL_CondSignal(is->videoq.cond); SDL_Quit(); return 0; break; case FF_ALLOC_EVENT: alloc_picture(event.user.data1,pRenderer); break; case FF_REFRESH_EVENT: video_refresh_timer(event.user.data1,pRenderer); break; default: break; } } SDL_DestroyTexture(texture); return 0; } 0 0
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