qtffutil.h

#ifndef QTFFUTIL_H_
#define QTFFUTIL_H_

// Note: this header is derived from ffplay - hence the almost complete lack of 
// documentation.

#ifdef CONFIG_OS2
      MorphToPM(); // Morph the VIO application to a PM one to be able to use Win* functions
      // Make stdout and stderr unbuffered
      setbuf( stdout, NULL );
      setbuf( stderr, NULL );
#endif

// Definitions
AVPicture grabPict;
extern Uint8 *dataR, *dataG, *dataB, *dataA;

extern int globWidth, globHeight;
extern int globLine0, globLine1, globLine2;

void packet_queue_init(PacketQueue *q);
void packet_queue_flush(PacketQueue *q);
void packet_queue_end(PacketQueue *q);
int packet_queue_put(PacketQueue *q, AVPacket *pkt);
void packet_queue_abort(PacketQueue *q);
int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block);
Uint32 sdl_refresh_timer_cb(Uint32 interval, void *opaque);
double get_audio_clock(VideoState *is);
double get_video_clock(VideoState *is);
double get_external_clock(VideoState *is);
void stream_pause(VideoState *is);
int queue_picture(VideoState *is, AVFrame *src_frame, double pts);
int output_picture2(VideoState *is, AVFrame *src_frame, double pts1);
int video_thread(void *arg);
int subtitle_thread(void *arg);
void update_sample_display(VideoState *is, short *samples, int samples_size);
int synchronize_audio(VideoState *is, short *samples,int samples_size1, double pts);
int audio_decode_frame(VideoState *is, uint8_t *audio_buf, double *pts_ptr);
int audio_write_get_buf_size(VideoState *is);
void sdl_audio_callback(void *opaque, Uint8 *stream, int len);
int stream_component_open(VideoState *is, int stream_index);
void stream_component_close(VideoState *is, int stream_index);
void dump_stream_info(AVFormatContext *s);
int decode_interrupt_cb(void);
int decode_thread(void *arg);
        

/* packet queue handling */
void packet_queue_init(PacketQueue *q)
{
    memset(q, 0, sizeof(PacketQueue));
    q->mutex = SDL_CreateMutex();
    q->cond = SDL_CreateCond();
}

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);
}

void packet_queue_end(PacketQueue *q)
{
    packet_queue_flush(q);
    SDL_DestroyMutex(q->mutex);
    SDL_DestroyCond(q->cond);
}

int packet_queue_put(PacketQueue *q, AVPacket *pkt)
{
    AVPacketList *pkt1;

    /* duplicate the packet */
    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;
    /* XXX: should duplicate packet data in DV case */
    SDL_CondSignal(q->cond);

    SDL_UnlockMutex(q->mutex);
    return 0;
}

void packet_queue_abort(PacketQueue *q)
{
    SDL_LockMutex(q->mutex);

    q->abort_request = 1;

    SDL_CondSignal(q->cond);

    SDL_UnlockMutex(q->mutex);
}

/* return < 0 if aborted, 0 if no packet and > 0 if packet.  */
int packet_queue_get(PacketQueue *q, AVPacket *pkt, int block)
{
    AVPacketList *pkt1;
    int ret;

    SDL_LockMutex(q->mutex);

    for(;;) {
        if (q->abort_request) {
            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;
}

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 */
}

/* get the current audio clock value */
double get_audio_clock(VideoState *is)
{
    double pts;
    int hw_buf_size, bytes_per_sec;
    pts = is->audio_clock;
    hw_buf_size = audio_write_get_buf_size(is);
    bytes_per_sec = 0;
    if (is->audio_st) {
        bytes_per_sec = is->audio_st->codec->sample_rate *
                2 * is->audio_st->codec->channels;
    }
    if (bytes_per_sec)
        pts -= (double)hw_buf_size / bytes_per_sec;
    return pts;
}

/* get the current video clock value */
double get_video_clock(VideoState *is)
{
    double delta;
    if (is->paused) {
        delta = 0;
    } else {
        delta = (av_gettime() - is->video_current_pts_time) / 1000000.0;
    }
    return is->video_current_pts + delta;
}

/* get the current external clock value */
double get_external_clock(VideoState *is)
{
    int64_t ti;
    ti = av_gettime();
    return is->external_clock + ((ti - is->external_clock_time) * 1e-6);
}

/* get the current master clock value */
double get_master_clock(VideoState *is)
{
    double val;

    if (is->av_sync_type == AV_SYNC_VIDEO_MASTER) {
        if (is->video_st)
            val = get_video_clock(is);
        else
            val = get_audio_clock(is);
    } else if (is->av_sync_type == AV_SYNC_AUDIO_MASTER) {
        if (is->audio_st)
            val = get_audio_clock(is);
        else
            val = get_video_clock(is);
    } else {
        val = get_external_clock(is);
    }
    return val;
}

/* pause or resume the video */
void stream_pause(VideoState *is)
{
    is->paused = !is->paused;
    if (is->paused) {
        is->video_current_pts = get_video_clock(is);
    }
}

int queue_picture(VideoState *is, AVFrame *src_frame, double pts)
{
    VideoPicture *vp;
    int dst_pix_fmt;
    AVPicture pict;
    
    
    

    /* wait until we have space to put a new picture */
    SDL_LockMutex(is->pictq_mutex);
    while (is->pictq_size >= VIDEO_PICTURE_QUEUE_SIZE &&
           !is->videoq.abort_request) {
        SDL_CondWait(is->pictq_cond, is->pictq_mutex);
           }
           SDL_UnlockMutex(is->pictq_mutex);

           if (is->videoq.abort_request)
               return -1;

           vp = &is->pictq[is->pictq_windex];

           /* alloc or resize hardware picture buffer */
           if (!vp->bmp ||
                vp->width != is->video_st->codec->width ||
                vp->height != is->video_st->codec->height) {
               SDL_Event event;

               vp->allocated = 0;

        /* the allocation must be done in the main thread to avoid
               locking problems */
               event.type = FF_ALLOC_EVENT;
               event.user.data1 = is;
               SDL_PushEvent(&event);

               /* wait until the picture is allocated */
               SDL_LockMutex(is->pictq_mutex);
               while (!vp->allocated && !is->videoq.abort_request) {
                   SDL_CondWait(is->pictq_cond, is->pictq_mutex);
               }
               SDL_UnlockMutex(is->pictq_mutex);

               if (is->videoq.abort_request)
                   return -1;
                }

                /* if the frame is not skipped, then display it */
                if (vp->bmp) {
                    /* get a pointer on the bitmap */
                    SDL_LockYUVOverlay (vp->bmp);

                    dst_pix_fmt = PIX_FMT_YUV420P;
                    
                    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];
                                                   
                                        // copy the vp->bmp pixels to some other structure
                                        globWidth = is->video_st->codec->width;
                                        globHeight = is->video_st->codec->height;
                                        globLine0 =pict.linesize[0];
                                        globLine1 =pict.linesize[1];
                                        globLine2 =pict.linesize[2];
                                        
                                        // Need only do this alloc once.. 
                                        if (!dataR)
                                                dataR = (Uint8*)av_malloc( globLine0 * globHeight);
                                        if (!dataG)
                                                dataG = (Uint8*)av_malloc(globLine1 * globHeight);
                                        if (!dataB)
                                                dataB = (Uint8*)av_malloc(globLine2 * globHeight);
                                        
                                        //memcpy( (void*)dataR, (void*)pict.data[0], pict.linesize[0] * globHeight);
                                        //memcpy( (void*)dataB, (void*)&pict.data[2], pict.linesize[2]);
                                        //memcpy( (void*)dataA, pict.data[3], pict.linesize[3]);
                                        //printf("%d %d %d %d\n",pict.linesize[0],pict.linesize[1],pict.linesize[2],pict.linesize[3]);
                                        //memcpy( (void*)dataa, &grabPict.data[3], grabPict.linesize[3]);                
                    // Original below
                    // RLR Here ??
                    //img_convert(&pict, PIX_FMT_RGBA32,
                               //(AVPicture *)src_frame, is->video_st->codec->pix_fmt,
                                //is->video_st->codec->width, is->video_st->codec->height);
                       
                    img_convert(&pict, dst_pix_fmt,
                               (AVPicture *)src_frame, is->video_st->codec->pix_fmt,
                                 is->video_st->codec->width, is->video_st->codec->height);
                        
                        memcpy( dataR, vp->bmp->pixels[0], globLine0 * globHeight);
                                        memcpy( dataG, vp->bmp->pixels[2], globLine2 * globHeight);
                                        memcpy( dataB, vp->bmp->pixels[1], globLine1 * globHeight);                                     
                                                                        
                                        //printf("fmt %x\n",vp->bmp->format);
                    /* update the bitmap content */
                    SDL_UnlockYUVOverlay(vp->bmp);

                    vp->pts = pts;

                    /* now we can update the picture count */
                    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;
}

int output_picture2(VideoState *is, AVFrame *src_frame, double pts1)
{
    double frame_delay, pts;

    pts = pts1;

    if (pts != 0) {
        /* update video clock with pts, if present */
        is->video_clock = pts;
    } else {
        pts = is->video_clock;
    }
    /* update video clock for next frame */
    frame_delay = av_q2d(is->video_st->codec->time_base);
    /* for MPEG2, the frame can be repeated, so we update the
    clock accordingly */
    frame_delay += src_frame->repeat_pict * (frame_delay * 0.5);
    is->video_clock += frame_delay;
    return queue_picture(is, src_frame, pts);
}

int video_thread(void *arg)
{
    VideoState *is = (VideoState*)arg;
    AVPacket pkt1, *pkt = &pkt1;
    int len1, got_picture;
    AVFrame *frame= avcodec_alloc_frame();
    double pts;

    for(;;) {
        while (is->paused && !is->videoq.abort_request) {
            SDL_Delay(10);
        }
        if (packet_queue_get(&is->videoq, pkt, 1) < 0)
            break;
        /* NOTE: ipts is the PTS of the _first_ picture beginning in
        this packet, if any */
        pts = 0;
        if (pkt->dts != AV_NOPTS_VALUE)
            pts = av_q2d(is->video_st->time_base)*pkt->dts;

        SDL_LockMutex(is->video_decoder_mutex);
        len1 = avcodec_decode_video(is->video_st->codec,
                                    frame, &got_picture,
                                    pkt->data, pkt->size);
        SDL_UnlockMutex(is->video_decoder_mutex);

        if (got_picture) {
            if (output_picture2(is, frame, pts) < 0)
                goto the_end;
        }
        av_free_packet(pkt);
        if (step)
            if (cur_stream)
                stream_pause(cur_stream);
    }
 the_end:
         av_free(frame);
 return 0;
}

int subtitle_thread(void *arg)
{
    VideoState *is = (VideoState*)arg;
    SubPicture *sp;
    AVPacket pkt1, *pkt = &pkt1;
    int len1, got_subtitle;
    double pts;
    int i, j;
    int r, g, b, y, u, v, a;

    for(;;) {
        while (is->paused && !is->subtitleq.abort_request) {
            SDL_Delay(10);
        }
        if (packet_queue_get(&is->subtitleq, pkt, 1) < 0)
            break;

        SDL_LockMutex(is->subpq_mutex);
        while (is->subpq_size >= SUBPICTURE_QUEUE_SIZE &&
               !is->subtitleq.abort_request) {
            SDL_CondWait(is->subpq_cond, is->subpq_mutex);
               }
               SDL_UnlockMutex(is->subpq_mutex);

               if (is->subtitleq.abort_request)
                   goto the_end;

               sp = &is->subpq[is->subpq_windex];

       /* NOTE: ipts is the PTS of the _first_ picture beginning in
               this packet, if any */
               pts = 0;
               if (pkt->pts != AV_NOPTS_VALUE)
                   pts = av_q2d(is->subtitle_st->time_base)*pkt->pts;

               SDL_LockMutex(is->subtitle_decoder_mutex);
               len1 = avcodec_decode_subtitle(is->subtitle_st->codec,
                                              &sp->sub, &got_subtitle,
                                              pkt->data, pkt->size);
               SDL_UnlockMutex(is->subtitle_decoder_mutex);
//            if (len1 < 0)
//                break;
               if (got_subtitle && sp->sub.format == 0) {
                   sp->pts = pts;

                   for (i = 0; i < sp->sub.num_rects; i++)
                   {
                       for (j = 0; j < sp->sub.rects[i].nb_colors; j++)
                       {
                           RGBA_IN(r, g, b, a, sp->sub.rects[i].rgba_palette + j);
                           y = RGB_TO_Y_CCIR(r, g, b);
                           u = RGB_TO_U_CCIR(r, g, b, 0);
                           v = RGB_TO_V_CCIR(r, g, b, 0);
                           YUVA_OUT(sp->sub.rects[i].rgba_palette + j, y, u, v, a);
                       }
                   }

                   /* now we can update the picture count */
                   if (++is->subpq_windex == SUBPICTURE_QUEUE_SIZE)
                       is->subpq_windex = 0;
                   SDL_LockMutex(is->subpq_mutex);
                   is->subpq_size++;
                   SDL_UnlockMutex(is->subpq_mutex);
               }
               av_free_packet(pkt);
    }
 the_end:
         return 0;
}

/* copy samples for viewing in editor window */
void update_sample_display(VideoState *is, short *samples, int samples_size)
{
    int size, len, channels;

    channels = is->audio_st->codec->channels;

    size = samples_size / sizeof(short);
    while (size > 0) {
        len = SAMPLE_ARRAY_SIZE - is->sample_array_index;
        if (len > size)
            len = size;
        memcpy(is->sample_array + is->sample_array_index, samples, len * sizeof(short));
        samples += len;
        is->sample_array_index += len;
        if (is->sample_array_index >= SAMPLE_ARRAY_SIZE)
            is->sample_array_index = 0;
        size -= len;
    }
}

/* return the new audio buffer size (samples can be added or deleted
   to get better sync if video or external master clock) */
int synchronize_audio(VideoState *is, short *samples,int samples_size1, double pts)
{
    int n, samples_size;
    double ref_clock;

    n = 2 * is->audio_st->codec->channels;
    samples_size = samples_size1;

    /* if not master, then we try to remove or add samples to correct the clock */
    if (((is->av_sync_type == AV_SYNC_VIDEO_MASTER && is->video_st) ||
          is->av_sync_type == AV_SYNC_EXTERNAL_CLOCK)) {
        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) {
            is->audio_diff_cum = diff + is->audio_diff_avg_coef * is->audio_diff_cum;
            if (is->audio_diff_avg_count < AUDIO_DIFF_AVG_NB) {
                /* not enough measures to have a correct estimate */
                is->audio_diff_avg_count++;
            } else {
                /* estimate the A-V difference */
                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);
                    nb_samples = samples_size / n;

                    min_size = ((nb_samples * (100 - SAMPLE_CORRECTION_PERCENT_MAX)) / 100) * n;
                    max_size = ((nb_samples * (100 + SAMPLE_CORRECTION_PERCENT_MAX)) / 100) * n;
                    if (wanted_size < min_size)
                        wanted_size = min_size;
                    else if (wanted_size > max_size)
                        wanted_size = max_size;

                    /* add or remove samples to correction the synchro */
                    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 */
                        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 {
            /* too big difference : may be initial PTS errors, so
            reset A-V filter */
            is->audio_diff_avg_count = 0;
            is->audio_diff_cum = 0;
        }
          }
          return samples_size;
}

/* decode one audio frame and returns its uncompressed size */
int audio_decode_frame(VideoState *is, uint8_t *audio_buf, double *pts_ptr)
{
    AVPacket *pkt = &is->audio_pkt;
    int n, len1, data_size;
    double pts;

    for(;;) {
        /* NOTE: the audio packet can contain several frames */
        while (is->audio_pkt_size > 0) {
            SDL_LockMutex(is->audio_decoder_mutex);
            len1 = avcodec_decode_audio(is->audio_st->codec,
                                        (int16_t *)audio_buf, &data_size,
                                        is->audio_pkt_data, is->audio_pkt_size);
            SDL_UnlockMutex(is->audio_decoder_mutex);
            if (len1 < 0) {
                /* if error, we skip the frame */
                is->audio_pkt_size = 0;
                break;
            }

            is->audio_pkt_data += len1;
            is->audio_pkt_size -= len1;
            if (data_size <= 0)
                continue;
            /* if no pts, then compute it */
            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);
#if defined(DEBUG_SYNC)
{
    static double last_clock;
    printf("audio: delay=%0.3f clock=%0.3f pts=%0.3f\n",
           is->audio_clock - last_clock,
           is->audio_clock, pts);
    last_clock = is->audio_clock;
}
#endif
            return data_size;
        }

        /* free the current packet */
        if (pkt->data)
            av_free_packet(pkt);

        if (is->paused || is->audioq.abort_request) {
            return -1;
        }

        /* read 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 update the audio clock with the pts */
        if (pkt->pts != AV_NOPTS_VALUE) {
            is->audio_clock = av_q2d(is->audio_st->time_base)*pkt->pts;
        }
    }
}

/* get the current audio output buffer size, in samples. With SDL, we
   cannot have a precise information */
int audio_write_get_buf_size(VideoState *is)
{
    return is->audio_hw_buf_size - is->audio_buf_index;
}

/* prepare a new audio buffer */
void sdl_audio_callback(void *opaque, Uint8 *stream, int len)
{
    VideoState *is = (VideoState*)opaque;
    int audio_size, len1;
    double pts;

    audio_callback_time = av_gettime();

    while (len > 0) {
        if (is->audio_buf_index >= is->audio_buf_size) {
            audio_size = audio_decode_frame(is, is->audio_buf, &pts);
            if (audio_size < 0) {
                /* if error, just output silence */
                is->audio_buf_size = 1024;
                memset(is->audio_buf, 0, is->audio_buf_size);
            } else {
                if (is->show_audio)
                    update_sample_display(is, (int16_t *)is->audio_buf, audio_size);
                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;
    }
}


/* open a given stream. Return 0 if OK */
int stream_component_open(VideoState *is, int stream_index)
{
    AVFormatContext *ic = is->ic;
    AVCodecContext *enc;
    AVCodec *codec;
    SDL_AudioSpec wanted_spec, spec;

    if (stream_index < 0 || stream_index >= ic->nb_streams)
        return -1;
    enc = ic->streams[stream_index]->codec;

    /* prepare audio output */
    if (enc->codec_type == CODEC_TYPE_AUDIO) {
        wanted_spec.freq = enc->sample_rate;
        wanted_spec.format = AUDIO_S16SYS;
        /* hack for AC3. XXX: suppress that */
        if (enc->channels > 2)
            enc->channels = 2;
        wanted_spec.channels = enc->channels;
        wanted_spec.silence = 0;
        wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
        wanted_spec.callback = sdl_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(enc->codec_id);
    enc->debug_mv = debug_mv;
    enc->debug = debug;
    if(debug)
        av_log_set_level(AV_LOG_DEBUG);
    enc->workaround_bugs = workaround_bugs;
    enc->lowres = lowres;
    if(lowres) enc->flags |= CODEC_FLAG_EMU_EDGE;
    enc->idct_algo= idct;
    if(fast) enc->flags2 |= CODEC_FLAG2_FAST;
    enc->skip_frame= skip_frame;
    enc->skip_idct= skip_idct;
    enc->skip_loop_filter= skip_loop_filter;
    enc->error_resilience= error_resilience;
    enc->error_concealment= error_concealment;
    if (!codec ||
         avcodec_open(enc, codec) < 0)
        return -1;
#if defined(HAVE_THREADS)
    if(thread_count>1)
        avcodec_thread_init(enc, thread_count);
#endif
    enc->thread_count= thread_count;
    switch(enc->codec_type) {
        case CODEC_TYPE_AUDIO:
            is->audio_stream = stream_index;
            is->audio_st = ic->streams[stream_index];
            is->audio_buf_size = 0;
            is->audio_buf_index = 0;

            /* init averaging filter */
            is->audio_diff_avg_coef = exp(log(0.01) / AUDIO_DIFF_AVG_NB);
            is->audio_diff_avg_count = 0;
        /* since we do not have a precise anough audio fifo fullness,
            we correct audio sync only if larger than this threshold */
            is->audio_diff_threshold = 2.0 * SDL_AUDIO_BUFFER_SIZE / enc->sample_rate;

            memset(&is->audio_pkt, 0, sizeof(is->audio_pkt));
            packet_queue_init(&is->audioq);
            SDL_PauseAudio(0);
            break;
        case CODEC_TYPE_VIDEO:
            is->video_stream = stream_index;
            is->video_st = ic->streams[stream_index];

            is->frame_last_delay = 40e-3;
            is->frame_timer = (double)av_gettime() / 1000000.0;
            is->video_current_pts_time = av_gettime();

            packet_queue_init(&is->videoq);
            is->video_tid = SDL_CreateThread(video_thread, is);
            break;
        case CODEC_TYPE_SUBTITLE:
            is->subtitle_stream = stream_index;
            is->subtitle_st = ic->streams[stream_index];
            packet_queue_init(&is->subtitleq);

            is->subtitle_tid = SDL_CreateThread(subtitle_thread, is);
            break;
        default:
            break;
    }
    return 0;
}

void stream_component_close(VideoState *is, int stream_index)
{
    AVFormatContext *ic = is->ic;
    AVCodecContext *enc;

    if (stream_index < 0 || stream_index >= ic->nb_streams)
        return;
    enc = ic->streams[stream_index]->codec;

    switch(enc->codec_type) {
        case CODEC_TYPE_AUDIO:
            packet_queue_abort(&is->audioq);

            SDL_CloseAudio();

            packet_queue_end(&is->audioq);
            break;
        case CODEC_TYPE_VIDEO:
            packet_queue_abort(&is->videoq);

        /* note: we also signal this mutex to make sure we deblock the
            video thread in all cases */
            SDL_LockMutex(is->pictq_mutex);
            SDL_CondSignal(is->pictq_cond);
            SDL_UnlockMutex(is->pictq_mutex);

            SDL_WaitThread(is->video_tid, NULL);

            packet_queue_end(&is->videoq);
            break;
        case CODEC_TYPE_SUBTITLE:
            packet_queue_abort(&is->subtitleq);

        /* note: we also signal this mutex to make sure we deblock the
            video thread in all cases */
            SDL_LockMutex(is->subpq_mutex);
            is->subtitle_stream_changed = 1;

            SDL_CondSignal(is->subpq_cond);
            SDL_UnlockMutex(is->subpq_mutex);

            SDL_WaitThread(is->subtitle_tid, NULL);

            packet_queue_end(&is->subtitleq);
            break;
        default:
            break;
    }

    avcodec_close(enc);
    switch(enc->codec_type) {
        case CODEC_TYPE_AUDIO:
            is->audio_st = NULL;
            is->audio_stream = -1;
            break;
        case CODEC_TYPE_VIDEO:
            is->video_st = NULL;
            is->video_stream = -1;
            break;
        case CODEC_TYPE_SUBTITLE:
            is->subtitle_st = NULL;
            is->subtitle_stream = -1;
            break;
        default:
            break;
    }
}

void dump_stream_info(AVFormatContext *s)
{
    if (s->track != 0)
        fprintf(stderr, "Track: %d\n", s->track);
    if (s->title[0] != '\0')
        fprintf(stderr, "Title: %s\n", s->title);
    if (s->author[0] != '\0')
        fprintf(stderr, "Author: %s\n", s->author);
    if (s->album[0] != '\0')
        fprintf(stderr, "Album: %s\n", s->album);
    if (s->year != 0)
        fprintf(stderr, "Year: %d\n", s->year);
    if (s->genre[0] != '\0')
        fprintf(stderr, "Genre: %s\n", s->genre);
}

int decode_interrupt_cb(void)
{
    return (global_video_state && global_video_state->abort_request);
}

/* this thread gets the stream from the disk or the network */
int decode_thread(void *arg)
{
    VideoState *is = (VideoState*)arg;
    AVFormatContext *ic;
    int err, i, ret, video_index, audio_index, use_play;
    AVPacket pkt1, *pkt = &pkt1;
    AVFormatParameters params, *ap = &params;

    video_index = -1;
    audio_index = -1;
    is->video_stream = -1;
    is->audio_stream = -1;
    is->subtitle_stream = -1;

    global_video_state = is;
    url_set_interrupt_cb(decode_interrupt_cb);

    memset(ap, 0, sizeof(*ap));
    ap->image_format = image_format;
    ap->initial_pause = 1; /* we force a pause when starting an RTSP
    stream */

    err = av_open_input_file(&ic, is->filename, is->iformat, 0, ap);
    if (err < 0) {
        //print_error(is->filename, err);
        ret = -1;
        goto fail;
    }
    is->ic = ic;
//#ifdef CONFIG_NETWORK
  //  use_play = (ic->iformat == &rtsp_demux);
//#else
    use_play = 0;
//#endif

    if(genpts)
        ic->flags |= AVFMT_FLAG_GENPTS;

    if (!use_play) {
        err = av_find_stream_info(ic);
        if (err < 0) {
            fprintf(stderr, "%s: could not find codec parameters\n", is->filename);
            ret = -1;
            goto fail;
        }
        ic->pb.eof_reached= 0; //FIXME hack, ffplay maybe shouldnt use url_feof() to test for the end
    }

    /* if seeking requested, we execute it */
    if (start_time != AV_NOPTS_VALUE) {
        int64_t timestamp;

        timestamp = start_time;
        /* add the stream start time */
        if (ic->start_time != AV_NOPTS_VALUE)
            timestamp += ic->start_time;
        ret = av_seek_frame(ic, -1, timestamp, AVSEEK_FLAG_BACKWARD);
        if (ret < 0) {
            fprintf(stderr, "%s: could not seek to position %0.3f\n",
                    is->filename, (double)timestamp / AV_TIME_BASE);
        }
    }

    /* now we can begin to play (RTSP stream only) */
    av_read_play(ic);

    if (use_play) {
        err = av_find_stream_info(ic);
        if (err < 0) {
            fprintf(stderr, "%s: could not find codec parameters\n", is->filename);
            ret = -1;
            goto fail;
        }
    }

    for(i = 0; i < ic->nb_streams; i++) {
        AVCodecContext *enc = ic->streams[i]->codec;
        switch(enc->codec_type) {
            case CODEC_TYPE_AUDIO:
                if (audio_index < 0 && !audio_disable)
                    audio_index = i;
                break;
            case CODEC_TYPE_VIDEO:
                if (video_index < 0 && !video_disable)
                    video_index = i;
                break;
            default:
                break;
        }
    }
    if (show_status) {
        dump_format(ic, 0, is->filename, 0);
        dump_stream_info(ic);
    }

    /* open the streams */
    if (audio_index >= 0) {
        stream_component_open(is, audio_index);
    }

    if (video_index >= 0) {
        stream_component_open(is, video_index);
    } else {
        if (!display_disable)
            is->show_audio = 1;
    }

    if (is->video_stream < 0 && is->audio_stream < 0) {
        fprintf(stderr, "%s: could not open codecs\n", is->filename);
        ret = -1;
        goto fail;
    }

    for(;;) {
        if (is->abort_request)
            break;
#ifdef CONFIG_NETWORK
        if (is->paused != is->last_paused) {
    is->last_paused = is->paused;
    if (is->paused)
        av_read_pause(ic);
    else
        av_read_play(ic);
        }
        //if (is->paused && ic->iformat == &rtsp_demux) {
            /* wait 10 ms to avoid trying to get another packet */
            /* XXX: horrible */
        //    SDL_Delay(10);
        //    continue;
        //}
#endif
        if (is->seek_req) {
    /* XXX: must lock decoder threads */
    SDL_LockMutex(is->video_decoder_mutex);
    SDL_LockMutex(is->audio_decoder_mutex);
    SDL_LockMutex(is->subtitle_decoder_mutex);
    ret = av_seek_frame(is->ic, -1, is->seek_pos, is->seek_flags);
    if (ret < 0) {
        fprintf(stderr, "%s: error while seeking\n", is->ic->filename);
    }else{
        if (is->audio_stream >= 0) {
            packet_queue_flush(&is->audioq);
        }
        if (is->subtitle_stream >= 0) {
            packet_queue_flush(&is->subtitleq);
        }
        if (is->video_stream >= 0) {
            packet_queue_flush(&is->videoq);
            avcodec_flush_buffers(ic->streams[video_index]->codec);
        }
    }
    SDL_UnlockMutex(is->subtitle_decoder_mutex);
    SDL_UnlockMutex(is->audio_decoder_mutex);
    SDL_UnlockMutex(is->video_decoder_mutex);
    is->seek_req = 0;
        }

        /* if the queue are full, no need to read more */
        if (is->audioq.size > MAX_AUDIOQ_SIZE ||
            is->videoq.size > MAX_VIDEOQ_SIZE ||
            is->subtitleq.size > MAX_SUBTITLEQ_SIZE ||
            url_feof(&ic->pb)) {
            /* wait 10 ms */
            SDL_Delay(10);
            continue;
            }
            ret = av_read_frame(ic, pkt);
            if (ret < 0) {
                if (url_ferror(&ic->pb) == 0) {
                    SDL_Delay(100); /* wait for user event */
                    continue;
                } else
                    break;
            }
            if (pkt->stream_index == is->audio_stream) {
                packet_queue_put(&is->audioq, pkt);
            } else if (pkt->stream_index == is->video_stream) {
                packet_queue_put(&is->videoq, pkt);
            } else if (pkt->stream_index == is->subtitle_stream) {
                packet_queue_put(&is->subtitleq, pkt);
            } else {
                av_free_packet(pkt);
            }
    }
    /* wait until the end */
    while (!is->abort_request) {
        SDL_Delay(100);
    }

    ret = 0;
 fail:
         /* disable interrupting */
         global_video_state = NULL;

 /* close each stream */
 if (is->audio_stream >= 0)
     stream_component_close(is, is->audio_stream);
 if (is->video_stream >= 0)
     stream_component_close(is, is->video_stream);
 if (is->subtitle_stream >= 0)
     stream_component_close(is, is->subtitle_stream);
 if (is->ic) {
     av_close_input_file(is->ic);
     is->ic = NULL; /* safety */
 }
 url_set_interrupt_cb(NULL);

 if (ret != 0) {
     SDL_Event event;

     event.type = FF_QUIT_EVENT;
     event.user.data1 = is;
     SDL_PushEvent(&event);
 }
 return 0;
}

#endif /*QTFFUTIL_H_*/

---