来源:http://blog.csdn.net/mu399/article/details/5818970
这篇教程例子中的程序,让右方向按键为快进10秒,上方向按键为快进60秒,左方向按键为快退10秒,上方向按键为快退60秒,程序中的 av_seek_frame函数可能是用错了,或者函数本身的问题导致按上和右都没反应;按左和下让画面暂停,声音在很短区间内不停播放,这时再按右和下 才正常。
[cpp] view plaincopy
- #include "libavformat/avformat.h"
- #include "libswscale/swscale.h"
- #include <SDL/SDL.h>
- #include <SDL/SDL_thread.h>
- #ifdef main
- #undef main /* Prevents SDL from overriding main() */
- #endif
- #include <stdio.h>
- #include <math.h>
- #define SDL_AUDIO_BUFFER_SIZE 1024
- #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_EXTERNAL_MASTER
- enum
- {
- AV_SYNC_AUDIO_MASTER,
- AV_SYNC_VIDEO_MASTER,
- AV_SYNC_EXTERNAL_MASTER,
- };
- typedef struct PacketQueue
- {
- AVPacketList *first_pkt, *last_pkt;
- int nb_packets;
- int size;
- SDL_mutex *mutex;
- SDL_cond *cond;
- } PacketQueue;
- typedef struct VideoPicture
- {
- SDL_Overlay *bmp;
- int width, height; /* source height & width */
- int allocated;
- double pts;
- } VideoPicture;
- typedef struct VideoState
- {
- AVFormatContext *pFormatCtx;
- int videoStream, audioStream;
- int av_sync_type;
- double external_clock; /* external clock base */
- int64_t external_clock_time;
- int seek_req;
- int seek_flags;
- int64_t seek_pos;
- double audio_clock;
- AVStream *audio_st;
- PacketQueue audioq;
- uint8_t audio_buf[(AVCODEC_MAX_AUDIO_FRAME_SIZE * 3) / 2];
- unsigned int audio_buf_size;
- unsigned int audio_buf_index;
- 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 frame
- double 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 pts
- AVStream *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;
- } VideoState;
- SDL_Surface *screen;
- /* Since we only have one decoding thread, the Big Struct
- can be global in case we need it. */
- VideoState *global_video_state;
- AVPacket flush_pkt;
- 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(pkt != &flush_pkt && 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;
- }
- static void packet_queue_flush(PacketQueue *q)
- {
- AVPacketList *pkt, *pkt1;
- SDL_LockMutex(q->mutex);
- for(pkt = q->first_pkt; pkt != NULL; pkt = pkt1)
- {
- pkt1 = pkt->next;
- av_free_packet(&pkt->pkt);
- av_freep(&pkt);
- }
- q->last_pkt = NULL;
- q->first_pkt = NULL;
- q->nb_packets = 0;
- q->size = 0;
- SDL_UnlockMutex(q->mutex);
- }
- 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 len1, data_size, n;
- AVPacket *pkt = &is->audio_pkt;
- double pts;
- for(;;)
- {
- while(is->audio_pkt_size > 0)
- {
- data_size = buf_size;
- len1 = avcodec_decode_audio2(is->audio_st->codec,
- (int16_t *)audio_buf, &data_size,
- is->audio_pkt_data, is->audio_pkt_size);
- if(len1 < 0)
- {
- /* if error, skip frame */
- is->audio_pkt_size = 0;
- break;
- }
- is->audio_pkt_data += len1;
- is->audio_pkt_size -= len1;
- if(data_size <= 0)
- {
- /* No data yet, get more frames */
- continue;
- }
- 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);
- /* We have data, return it and come back for more later */
- 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;
- }
- if(pkt->data == flush_pkt.data)
- {
- avcodec_flush_buffers(is->audio_st->codec);
- continue;
- }
- is->audio_pkt_data = pkt->data;
- is->audio_pkt_size = pkt->size;
- /* if update, update the audio clock w/pts */
- 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;
- 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, is->audio_buf, sizeof(is->audio_buf), &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_Rect rect;
- VideoPicture *vp;
- AVPicture pict;
- float aspect_ratio;
- int w, h, x, y;
- int i;
- vp = &is->pictq[is->pictq_rindex];
- if(vp->bmp)
- {
- 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;
- }
- h = screen->h;
- w = ((int)(h * aspect_ratio)) & -3;
- if(w > screen->w)
- {
- w = screen->w;
- h = ((int)(w / aspect_ratio)) & -3;
- }
- x = (screen->w - w) / 2;
- y = (screen->h - h) / 2;
- rect.x = x;
- rect.y = y;
- rect.w = w;
- rect.h = h;
- SDL_DisplayYUVOverlay(vp->bmp, &rect);
- }
- }
- void video_refresh_timer(void *userdata)
- {
- 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; /* 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;
- /* update delay to sync to audio */
- ref_clock = get_master_clock(is);
- diff = vp->pts - ref_clock;
- /* Skip or repeat the frame. Take delay into account
- FFPlay still doesn‘t "know if this is the best guess." */
- if(is->av_sync_type != AV_SYNC_VIDEO_MASTER)
- {
- 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);
- /* 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)
- {
- VideoState *is = (VideoState *)userdata;
- VideoPicture *vp;
- vp = &is->pictq[is->pictq_windex];
- if(vp->bmp)
- {
- // we already have one make another, bigger/smaller
- SDL_FreeYUVOverlay(vp->bmp);
- }
- // Allocate a place to put our YUV image on that screen
- vp->bmp = SDL_CreateYUVOverlay(is->video_st->codec->width,
- is->video_st->codec->height,
- SDL_YV12_OVERLAY,
- screen);
- vp->width = is->video_st->codec->width;
- vp->height = is->video_st->codec->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)
- {
- VideoPicture *vp;
- //int dst_pix_fmt;
- AVPicture pict;
- /* 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->bmp ||
- 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 we are skipping a frame, do we set this to null
- but still return vp->allocated = 1? */
- static struct SwsContext *img_convert_ctx;
- if (img_convert_ctx == NULL)
- {
- img_convert_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_BICUBIC, NULL, NULL, NULL);
- if (img_convert_ctx == NULL)
- {
- fprintf(stderr, "Cannot initialize the conversion context/n");
- exit(1);
- }
- }
- if(vp->bmp)
- {
- SDL_LockYUVOverlay(vp->bmp);
- //dst_pix_fmt = PIX_FMT_YUV420P;
- /* 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
- /*img_convert(&pict, dst_pix_fmt,
- (AVPicture *)pFrame, is->video_st->codec->pix_fmt,
- is->video_st->codec->width, is->video_st->codec->height);*/
- sws_scale(img_convert_ctx, pFrame->data, pFrame->linesize,
- 0, is->video_st->codec->height, pict.data, pict.linesize);
- 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 len1, 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 call
- global_video_pkt_pts = packet->pts;
- // Decode video frame
- //printf("-----before---avcodec_decode_video/n");
- len1 = avcodec_decode_video(is->video_st->codec, pFrame, &frameFinished,
- packet->data, packet->size);
- //printf("-----after---avcodec_decode_video/n");
- 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);
- 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;
- AVCodec *codec;
- SDL_AudioSpec wanted_spec, spec;
- if(stream_index < 0 || stream_index >= pFormatCtx->nb_streams)
- {
- return -1;
- }
- // Get a pointer to the codec context for the video stream
- codecCtx = pFormatCtx->streams[stream_index]->codec;
- if(codecCtx->codec_type == CODEC_TYPE_AUDIO)
- {
- // Set audio settings from codec info
- 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: %s/n", SDL_GetError());
- return -1;
- }
- is->audio_hw_buf_size = spec.size;
- }
- codec = avcodec_find_decoder(codecCtx->codec_id);
- if(!codec || (avcodec_open(codecCtx, codec) < 0))
- {
- fprintf(stderr, "Unsupported codec!/n");
- return -1;
- }
- switch(codecCtx->codec_type)
- {
- case CODEC_TYPE_AUDIO:
- is->audioStream = stream_index;
- is->audio_st = pFormatCtx->streams[stream_index];
- is->audio_buf_size = 0;
- is->audio_buf_index = 0;
- memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
- packet_queue_init(&is->audioq);
- SDL_PauseAudio(0);
- break;
- case CODEC_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, is);
- codecCtx->get_buffer = our_get_buffer;
- codecCtx->release_buffer = our_release_buffer;
- break;
- default:
- break;
- }
- return 0;
- }
- int decode_interrupt_cb(void)
- {
- return (global_video_state && global_video_state->quit);
- }
- int decode_thread(void *arg)
- {
- VideoState *is = (VideoState *)arg;
- AVFormatContext *pFormatCtx;
- AVPacket pkt1, *packet = &pkt1;
- int video_index = -1;
- int audio_index = -1;
- int i;
- is->videoStream=-1;
- is->audioStream=-1;
- global_video_state = is;
- // will interrupt blocking functions if we quit!
- url_set_interrupt_cb(decode_interrupt_cb);
- // Open video file
- if(av_open_input_file(&pFormatCtx, is->filename, NULL, 0, NULL)!=0)
- return -1; // Couldn‘t open file
- is->pFormatCtx = pFormatCtx;
- // Retrieve stream information
- if(av_find_stream_info(pFormatCtx)<0)
- return -1; // Couldn‘t find stream information
- // Dump information about file onto standard error
- dump_format(pFormatCtx, 0, is->filename, 0);
- // Find the first video stream
- for(i=0; i<pFormatCtx->nb_streams; i++)
- {
- if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO &&
- video_index < 0)
- {
- video_index=i;
- }
- if(pFormatCtx->streams[i]->codec->codec_type==CODEC_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
- av_init_packet(&flush_pkt);
- flush_pkt.data = (uint8_t *)"FLUSH";
- for(;;)
- {
- if(is->quit)
- {
- break;
- }
- // seek stuff goes here
- if(is->seek_req)
- {
- int stream_index= -1;
- int64_t seek_target = is->seek_pos;
- if(is->videoStream >= 0)
- stream_index = is->videoStream;
- else if(is->audioStream >= 0)
- stream_index = is->audioStream;
- if(stream_index>=0)
- {
- AVRational base_q;
- base_q.den = 1;
- base_q.num = AV_TIME_BASE;
- seek_target = av_rescale_q(seek_target, base_q,pFormatCtx->streams[stream_index]->time_base);
- }
- if(!av_seek_frame(is->pFormatCtx, stream_index, seek_target, is->seek_flags))
- {
- fprintf(stderr, "%s: error while seeking/n", is->pFormatCtx->filename);
- }
- else
- {
- if(is->audioStream >= 0)
- {
- packet_queue_flush(&is->audioq);
- // packet_queue_put(&is->audioq, &flush_pkt);
- }
- if(is->videoStream >= 0)
- {
- packet_queue_flush(&is->videoq);
- // packet_queue_put(&is->videoq, &flush_pkt);
- }
- }
- is->seek_req = 0;
- printf("av_seek_frame called/n");
- }
- 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(url_ferror(pFormatCtx->pb) == 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:
- {
- SDL_Event event;
- event.type = FF_QUIT_EVENT;
- event.user.data1 = is;
- SDL_PushEvent(&event);
- }
- return 0;
- }
- void stream_seek(VideoState *is, int64_t pos, int rel)
- {
- if(!is->seek_req)
- {
- is->seek_pos = pos;
- is->seek_flags = rel < 0 ? AVSEEK_FLAG_BACKWARD : AVSEEK_FLAG_BYTE;
- is->seek_req = 1;
- }
- }
- int main(int argc, char *argv[])
- {
- SDL_Event event;
- VideoState *is;
- is = (VideoState *)av_mallocz(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))
- {
- fprintf(stderr, "Could not initialize SDL - %s/n", SDL_GetError());
- exit(1);
- }
- // Make a screen to put our video
- #ifndef __DARWIN__
- screen = SDL_SetVideoMode(640, 480, 0, 0);
- #else
- screen = SDL_SetVideoMode(640, 480, 24, 0);
- #endif
- if(!screen)
- {
- fprintf(stderr, "SDL: could not set video mode - exiting/n");
- exit(1);
- }
- //pstrcpy(is->filename, sizeof(is->filename), argv[1]);
- strcpy(is->filename,argv[1]);
- 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, is);
- if(!is->parse_tid)
- {
- av_free(is);
- return -1;
- }
- for(;;)
- {
- double incr, pos;
- SDL_WaitEvent(&event);
- switch(event.type)
- {
- case SDL_KEYDOWN:
- switch(event.key.keysym.sym)
- {
- case SDLK_LEFT:
- incr = -10.0;
- goto do_seek;
- case SDLK_RIGHT:
- incr = 10.0;
- goto do_seek;
- case SDLK_UP:
- incr = 60.0;
- goto do_seek;
- case SDLK_DOWN:
- incr = -60.0;
- goto do_seek;
- do_seek:
- if(global_video_state)
- {
- pos = get_master_clock(global_video_state);
- pos += incr;
- stream_seek(global_video_state, (int64_t)(pos * AV_TIME_BASE), incr);
- }
- break;
- default:
- break;
- }
- break;
- case FF_QUIT_EVENT:
- case SDL_QUIT:
- is->quit = 1;
- SDL_Quit();
- exit(0);
- break;
- case FF_ALLOC_EVENT:
- alloc_picture(event.user.data1);
- break;
- case FF_REFRESH_EVENT:
- video_refresh_timer(event.user.data1);
- break;
- default:
- break;
- }
- }
- return 0;
- }
时间: 2024-10-07 13:52:21