Beispiel #1
0
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
    AVRational a0={0,1}, a1={1,0};
    int sign= (nom<0) ^ (den<0);
    int64_t gcd= ff_gcd(ABS(nom), ABS(den));

    nom = ABS(nom)/gcd;
    den = ABS(den)/gcd;
    if(nom<=max && den<=max){
        a1= _AVRational((int)nom,(int)den); //Picard
        den=0;
    }
    
    while(den){
        int64_t x       = nom / den;
        int64_t next_den= nom - den*x;
        int64_t a2n= x*a1.num + a0.num;
        int64_t a2d= x*a1.den + a0.den;

        if(a2n > max || a2d > max) break;

        a0= a1;
		a1= _AVRational((int)a2n, (int)a2d); //Picard
        nom= den;
        den= next_den;
    }
    assert(ff_gcd(a1.num, a1.den) == 1);
    
    *dst_nom = sign ? -a1.num : a1.num;
    *dst_den = a1.den;
    
    return den==0;
}
Beispiel #2
0
/**
 * Routine to correct a possibly erroneous framerate being fed to us.
 * XviD currently chokes on framerates where the ticks per frame is
 * extremely large. This function works to correct problems in this area
 * by estimating a new framerate and taking the simpler fraction of
 * the two presented.
 *
 * @param avctx Context that contains the framerate to correct.
 */
void xvid_correct_framerate(AVCodecContext *avctx) {
    int frate, fbase;
    int est_frate, est_fbase;
    int gcd;
    float est_fps, fps;

    frate = avctx->time_base.den;
    fbase = avctx->time_base.num;

    gcd = ff_gcd(frate, fbase);
    if( gcd > 1 ) {
        frate /= gcd;
        fbase /= gcd;
    }

    if( frate <= 65000 && fbase <= 65000 ) {
        avctx->time_base.den = frate;
        avctx->time_base.num = fbase;
        return;
    }

    fps = (float)frate / (float)fbase;
    est_fps = roundf(fps * 1000.0) / 1000.0;

    est_frate = (int)est_fps;
    if( est_fps > (int)est_fps ) {
        est_frate = (est_frate + 1) * 1000;
        est_fbase = (int)roundf((float)est_frate / est_fps);
    } else
        est_fbase = 1;

    gcd = ff_gcd(est_frate, est_fbase);
    if( gcd > 1 ) {
        est_frate /= gcd;
        est_fbase /= gcd;
    }

    if( fbase > est_fbase ) {
        avctx->time_base.den = est_frate;
        avctx->time_base.num = est_fbase;
        av_log(avctx, AV_LOG_DEBUG,
            "XviD: framerate re-estimated: %.2f, %.3f%% correction\n",
            est_fps, (((est_fps - fps)/fps) * 100.0));
    } else {
        avctx->time_base.den = frate;
        avctx->time_base.num = fbase;
    }
}
Beispiel #3
0
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max) {
    AVRational a0= {0,1}, a1= {1,0};
    int sign= (nom<0) ^ (den<0);
    int64_t gcd= ff_gcd(FFABS(nom), FFABS(den));

    if(gcd) {
        nom = FFABS(nom)/gcd;
        den = FFABS(den)/gcd;
    }
    if(nom<=max && den<=max) {
        a1= (AVRational) {
            nom, den
        };
        den=0;
    }

    while(den) {
        uint64_t x      = nom / den;
        int64_t next_den= nom - den*x;
        int64_t a2n= x*a1.num + a0.num;
        int64_t a2d= x*a1.den + a0.den;

        if(a2n > max || a2d > max) {
            if(a1.num) x= (max - a0.num) / a1.num;
            if(a1.den) x= FFMIN(x, (max - a0.den) / a1.den);

            if (den*(2*x*a1.den + a0.den) > nom*a1.den)
                a1 = (AVRational) {
                x*a1.num + a0.num, x*a1.den + a0.den
            };
            break;
        }

        a0= a1;
        a1= (AVRational) {
            a2n, a2d
        };
        nom= den;
        den= next_den;
    }
    assert(ff_gcd(a1.num, a1.den) <= 1U);

    *dst_nom = sign ? -a1.num : a1.num;
    *dst_den = a1.den;

    return den==0;
}
Beispiel #4
0
void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
{
    int gcd;

    *au_ssize= stream->block_align;
    if(stream->frame_size && stream->sample_rate){
        *au_scale=stream->frame_size;
        *au_rate= stream->sample_rate;
    }else if(stream->codec_type == CODEC_TYPE_VIDEO){
        *au_scale= stream->time_base.num;
        *au_rate = stream->time_base.den;
    }else{
        *au_scale= stream->block_align ? stream->block_align*8 : 8;
        *au_rate = stream->bit_rate;
    }
    gcd= ff_gcd(*au_scale, *au_rate);
    *au_scale /= gcd;
    *au_rate /= gcd;
}
static demuxer_t* demux_open_lavf(demuxer_t *demuxer){
    AVFormatContext *avfc;
    AVFormatParameters ap;
    AVOption *opt;
    lavf_priv_t *priv= demuxer->priv;
    int i,g;
    char mp_filename[256]="mp:";

    memset(&ap, 0, sizeof(AVFormatParameters));

    stream_seek(demuxer->stream, 0);

    register_protocol(&mp_protocol);

    avfc = av_alloc_format_context();

    if (correct_pts)
        avfc->flags |= AVFMT_FLAG_GENPTS;
    if (index_mode == 0)
        avfc->flags |= AVFMT_FLAG_IGNIDX;

    ap.prealloced_context = 1;
    if(opt_probesize) {
        double d = (double) opt_probesize;
        opt = av_set_double(avfc, "probesize", opt_probesize);
        if(!opt) mp_msg(MSGT_HEADER,MSGL_ERR, "demux_lavf, couldn't set option probesize to %.3f\r\n", d);
    }

    if(demuxer->stream->url)
        strncpy(mp_filename + 3, demuxer->stream->url, sizeof(mp_filename)-3);
    else
        strncpy(mp_filename + 3, "foobar.dummy", sizeof(mp_filename)-3);
    
    url_fopen(&priv->pb, mp_filename, URL_RDONLY);
    
    ((URLContext*)(priv->pb.opaque))->priv_data= demuxer->stream;
        
    if(av_open_input_stream(&avfc, &priv->pb, mp_filename, priv->avif, &ap)<0){
        mp_msg(MSGT_HEADER,MSGL_ERR,"LAVF_header: av_open_input_stream() failed\n");
        return NULL;
    }

    priv->avfc= avfc;

    if(av_find_stream_info(avfc) < 0){
        mp_msg(MSGT_HEADER,MSGL_ERR,"LAVF_header: av_find_stream_info() failed\n");
        return NULL;
    }

    if(avfc->title    [0]) demux_info_add(demuxer, "name"     , avfc->title    );
    if(avfc->author   [0]) demux_info_add(demuxer, "author"   , avfc->author   );
    if(avfc->copyright[0]) demux_info_add(demuxer, "copyright", avfc->copyright);
    if(avfc->comment  [0]) demux_info_add(demuxer, "comments" , avfc->comment  );
    if(avfc->album    [0]) demux_info_add(demuxer, "album"    , avfc->album    );
//    if(avfc->year        ) demux_info_add(demuxer, "year"     , avfc->year     );
//    if(avfc->track       ) demux_info_add(demuxer, "track"    , avfc->track    );
    if(avfc->genre    [0]) demux_info_add(demuxer, "genre"    , avfc->genre    );

    for(i=0; i<avfc->nb_streams; i++){
        AVStream *st= avfc->streams[i];
        AVCodecContext *codec= st->codec;

        switch(codec->codec_type){
        case CODEC_TYPE_AUDIO:{
            WAVEFORMATEX *wf= calloc(sizeof(WAVEFORMATEX) + codec->extradata_size, 1);
            sh_audio_t* sh_audio;
            if(priv->audio_streams >= MAX_A_STREAMS)
                break;
            sh_audio=new_sh_audio(demuxer, i);
            if(!sh_audio)
                break;
            priv->astreams[priv->audio_streams] = i;
            priv->audio_streams++;
            if(!codec->codec_tag)
                codec->codec_tag= av_codec_get_tag(mp_wav_taglists, codec->codec_id);
            wf->wFormatTag= codec->codec_tag;
            wf->nChannels= codec->channels;
            wf->nSamplesPerSec= codec->sample_rate;
            wf->nAvgBytesPerSec= codec->bit_rate/8;
            wf->nBlockAlign= codec->block_align ? codec->block_align : 1;
            wf->wBitsPerSample= codec->bits_per_sample;
            wf->cbSize= codec->extradata_size;
            if(codec->extradata_size){
                memcpy(
                    wf + 1, 
                    codec->extradata,
                    codec->extradata_size);
            }
            sh_audio->wf= wf;
            sh_audio->audio.dwSampleSize= codec->block_align;
            if(codec->frame_size && codec->sample_rate){
                sh_audio->audio.dwScale=codec->frame_size;
                sh_audio->audio.dwRate= codec->sample_rate;
            }else{
                sh_audio->audio.dwScale= codec->block_align ? codec->block_align*8 : 8;
                sh_audio->audio.dwRate = codec->bit_rate;
            }
            g= ff_gcd(sh_audio->audio.dwScale, sh_audio->audio.dwRate);
            sh_audio->audio.dwScale /= g;
            sh_audio->audio.dwRate  /= g;
//            printf("sca:%d rat:%d fs:%d sr:%d ba:%d\n", sh_audio->audio.dwScale, sh_audio->audio.dwRate, codec->frame_size, codec->sample_rate, codec->block_align);
            sh_audio->ds= demuxer->audio;
            sh_audio->format= codec->codec_tag;
            sh_audio->channels= codec->channels;
            sh_audio->samplerate= codec->sample_rate;
            sh_audio->i_bps= codec->bit_rate/8;
            switch (codec->codec_id) {
              case CODEC_ID_PCM_S8:
              case CODEC_ID_PCM_U8:
                sh_audio->samplesize = 1;
                break;
              case CODEC_ID_PCM_S16LE:
              case CODEC_ID_PCM_S16BE:
              case CODEC_ID_PCM_U16LE:
              case CODEC_ID_PCM_U16BE:
                sh_audio->samplesize = 2;
                break;
              case CODEC_ID_PCM_ALAW:
                sh_audio->format = 0x6;
                break;
              case CODEC_ID_PCM_MULAW:
                sh_audio->format = 0x7;
                break;
            }
            if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_wave_header(sh_audio->wf, MSGL_V);
	    if((audio_lang && st->language[0] && !strncmp(audio_lang, st->language, 3))
	        || (demuxer->audio->id == i || demuxer->audio->id == -1)
	    ) {
	        demuxer->audio->id = i;
                demuxer->audio->sh= demuxer->a_streams[i];
	    }
            else
                st->discard= AVDISCARD_ALL;
            break;}
        case CODEC_TYPE_VIDEO:{
            sh_video_t* sh_video;
            BITMAPINFOHEADER *bih;
            if(priv->video_streams >= MAX_V_STREAMS)
                break;
            sh_video=new_sh_video(demuxer, i);
            if(!sh_video) break;
            priv->vstreams[priv->video_streams] = i;
            priv->video_streams++;
            bih=calloc(sizeof(BITMAPINFOHEADER) + codec->extradata_size,1);

            if(!codec->codec_tag)
                codec->codec_tag= av_codec_get_tag(mp_bmp_taglists, codec->codec_id);
            bih->biSize= sizeof(BITMAPINFOHEADER) + codec->extradata_size;
            bih->biWidth= codec->width;
            bih->biHeight= codec->height;
            bih->biBitCount= codec->bits_per_sample;
            bih->biSizeImage = bih->biWidth * bih->biHeight * bih->biBitCount/8;
            bih->biCompression= codec->codec_tag;
            sh_video->bih= bih;
            sh_video->disp_w= codec->width;
            sh_video->disp_h= codec->height;
            if (st->time_base.den) { /* if container has time_base, use that */
                sh_video->video.dwRate= st->time_base.den;
                sh_video->video.dwScale= st->time_base.num;
            } else {
            sh_video->video.dwRate= codec->time_base.den;
            sh_video->video.dwScale= codec->time_base.num;
            }
            sh_video->fps=av_q2d(st->r_frame_rate);
            sh_video->frametime=1/av_q2d(st->r_frame_rate);
            sh_video->format = bih->biCompression;
            sh_video->aspect=   codec->width * codec->sample_aspect_ratio.num 
                              / (float)(codec->height * codec->sample_aspect_ratio.den);
            sh_video->i_bps= codec->bit_rate/8;
            mp_msg(MSGT_DEMUX,MSGL_DBG2,"aspect= %d*%d/(%d*%d)\n", 
                codec->width, codec->sample_aspect_ratio.num,
                codec->height, codec->sample_aspect_ratio.den);

            sh_video->ds= demuxer->video;
            if(codec->extradata_size)
                memcpy(sh_video->bih + 1, codec->extradata, codec->extradata_size);
            if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_video_header(sh_video->bih, MSGL_V);
/*    short 	biPlanes;
    int  	biXPelsPerMeter;
    int  	biYPelsPerMeter;
    int 	biClrUsed;
    int 	biClrImportant;*/
            if(demuxer->video->id != i && demuxer->video->id != -1)
                st->discard= AVDISCARD_ALL;
            else{
                demuxer->video->id = i;
                demuxer->video->sh= demuxer->v_streams[i];
            }
            break;}
        default:
            st->discard= AVDISCARD_ALL;
        }
    }
    
    mp_msg(MSGT_HEADER,MSGL_V,"LAVF: %d audio and %d video streams found\n",priv->audio_streams,priv->video_streams);
    mp_msg(MSGT_HEADER,MSGL_V,"LAVF: build %d\n", LIBAVFORMAT_BUILD);
    if(!priv->audio_streams) demuxer->audio->id=-2;  // nosound
//    else if(best_audio > 0 && demuxer->audio->id == -1) demuxer->audio->id=best_audio;
    if(!priv->video_streams){
        if(!priv->audio_streams){
	    mp_msg(MSGT_HEADER,MSGL_ERR,"LAVF: no audio or video headers found - broken file?\n");
            return NULL; 
        }
        demuxer->video->id=-2; // audio-only
    } //else if (best_video > 0 && demuxer->video->id == -1) demuxer->video->id = best_video;

    return demuxer;
}
Beispiel #6
0
static void handle_stream(demuxer_t *demuxer, AVFormatContext *avfc, int i) {
    lavf_priv_t *priv= demuxer->priv;
    AVStream *st= avfc->streams[i];
    AVCodecContext *codec= st->codec;
    int g;

    switch(codec->codec_type){
        case CODEC_TYPE_AUDIO:{
            WAVEFORMATEX *wf= calloc(sizeof(WAVEFORMATEX) + codec->extradata_size, 1);
            sh_audio_t* sh_audio;
            if(priv->audio_streams >= MAX_A_STREAMS)
                break;
            sh_audio=new_sh_audio(demuxer, i);
            mp_msg(MSGT_DEMUX, MSGL_INFO, MSGTR_AudioID, "lavf", i);
            if(!sh_audio)
                break;
            priv->astreams[priv->audio_streams] = i;
            priv->audio_streams++;
            // mp4a tag is used for all mp4 files no matter what they actually contain
            if(codec->codec_tag == MKTAG('m', 'p', '4', 'a'))
                codec->codec_tag= 0;
            if(codec->codec_id == CODEC_ID_ADPCM_IMA_AMV)
                codec->codec_tag= MKTAG('A','M','V','A');
            if(!codec->codec_tag)
                codec->codec_tag= av_codec_get_tag(mp_wav_taglists, codec->codec_id);
            wf->wFormatTag= codec->codec_tag;
            wf->nChannels= codec->channels;
            wf->nSamplesPerSec= codec->sample_rate;
            wf->nAvgBytesPerSec= codec->bit_rate/8;
            wf->nBlockAlign= codec->block_align ? codec->block_align : 1;
            wf->wBitsPerSample= codec->bits_per_sample;
            wf->cbSize= codec->extradata_size;
            if(codec->extradata_size)
                memcpy(wf + 1, codec->extradata, codec->extradata_size);
            sh_audio->wf= wf;
            sh_audio->audio.dwSampleSize= codec->block_align;
            if(codec->frame_size && codec->sample_rate){
                sh_audio->audio.dwScale=codec->frame_size;
                sh_audio->audio.dwRate= codec->sample_rate;
            }else{
                sh_audio->audio.dwScale= codec->block_align ? codec->block_align*8 : 8;
                sh_audio->audio.dwRate = codec->bit_rate;
            }
            g= ff_gcd(sh_audio->audio.dwScale, sh_audio->audio.dwRate);
            sh_audio->audio.dwScale /= g;
            sh_audio->audio.dwRate  /= g;
//          printf("sca:%d rat:%d fs:%d sr:%d ba:%d\n", sh_audio->audio.dwScale, sh_audio->audio.dwRate, codec->frame_size, codec->sample_rate, codec->block_align);
            sh_audio->ds= demuxer->audio;
            sh_audio->format= codec->codec_tag;
            sh_audio->channels= codec->channels;
            sh_audio->samplerate= codec->sample_rate;
            sh_audio->i_bps= codec->bit_rate/8;
            switch (codec->codec_id) {
                case CODEC_ID_PCM_S8:
                case CODEC_ID_PCM_U8:
                    sh_audio->samplesize = 1;
                    break;
                case CODEC_ID_PCM_S16LE:
                case CODEC_ID_PCM_S16BE:
                case CODEC_ID_PCM_U16LE:
                case CODEC_ID_PCM_U16BE:
                    sh_audio->samplesize = 2;
                    break;
                case CODEC_ID_PCM_ALAW:
                    sh_audio->format = 0x6;
                    break;
                case CODEC_ID_PCM_MULAW:
                    sh_audio->format = 0x7;
                    break;
            }
            if(mp_msg_test(MSGT_HEADER,MSGL_V) ) print_wave_header(sh_audio->wf, MSGL_V);
            if((audio_lang && st->language[0] && !strncmp(audio_lang, st->language, 3))
                || (demuxer->audio->id == i || demuxer->audio->id == -1)) {
                demuxer->audio->id = i;
                demuxer->audio->sh= demuxer->a_streams[i];
            } else
                st->discard= AVDISCARD_ALL;
            break;
        }
        case CODEC_TYPE_VIDEO:{
            sh_video_t* sh_video;
            BITMAPINFOHEADER *bih;
            if(priv->video_streams >= MAX_V_STREAMS)
                break;
            sh_video=new_sh_video(demuxer, i);
            mp_msg(MSGT_DEMUX, MSGL_INFO, MSGTR_VideoID, "lavf", i);
            if(!sh_video) break;
            priv->vstreams[priv->video_streams] = i;
            priv->video_streams++;
            bih=calloc(sizeof(BITMAPINFOHEADER) + codec->extradata_size,1);

            if(!codec->codec_tag)
                codec->codec_tag= av_codec_get_tag(mp_bmp_taglists, codec->codec_id);
            bih->biSize= sizeof(BITMAPINFOHEADER) + codec->extradata_size;
            bih->biWidth= codec->width;
            bih->biHeight= codec->height;
            bih->biBitCount= codec->bits_per_sample;
            bih->biSizeImage = bih->biWidth * bih->biHeight * bih->biBitCount/8;
            bih->biCompression= codec->codec_tag;
            sh_video->bih= bih;
            sh_video->disp_w= codec->width;
            sh_video->disp_h= codec->height;
            if (st->time_base.den) { /* if container has time_base, use that */
                sh_video->video.dwRate= st->time_base.den;
                sh_video->video.dwScale= st->time_base.num;
            } else {
                sh_video->video.dwRate= codec->time_base.den;
                sh_video->video.dwScale= codec->time_base.num;
            }
            sh_video->fps=av_q2d(st->r_frame_rate);
            sh_video->frametime=1/av_q2d(st->r_frame_rate);
            sh_video->format=bih->biCompression;
            sh_video->aspect=codec->width * codec->sample_aspect_ratio.num 
                               / (float)(codec->height * codec->sample_aspect_ratio.den);
            sh_video->i_bps=codec->bit_rate/8;
            mp_msg(MSGT_DEMUX,MSGL_DBG2,"aspect= %d*%d/(%d*%d)\n", 
                codec->width, codec->sample_aspect_ratio.num,
                codec->height, codec->sample_aspect_ratio.den);

            sh_video->ds= demuxer->video;
            if(codec->extradata_size)
                memcpy(sh_video->bih + 1, codec->extradata, codec->extradata_size);
            if( mp_msg_test(MSGT_HEADER,MSGL_V) ) print_video_header(sh_video->bih, MSGL_V);
            /*
                short biPlanes;
                int  biXPelsPerMeter;
                int  biYPelsPerMeter;
                int biClrUsed;
                int biClrImportant;
            */
            if(demuxer->video->id != i && demuxer->video->id != -1)
                st->discard= AVDISCARD_ALL;
            else{
                demuxer->video->id = i;
                demuxer->video->sh= demuxer->v_streams[i];
            }
            break;
        }
        case CODEC_TYPE_SUBTITLE:{
            sh_sub_t* sh_sub;
            if(priv->sub_streams >= MAX_S_STREAMS)
                break;
            /* only support text subtitles for now */
            if(codec->codec_id != CODEC_ID_TEXT)
                break;
            sh_sub = new_sh_sub_sid(demuxer, i, priv->sub_streams);
            mp_msg(MSGT_DEMUX, MSGL_INFO, MSGTR_SubtitleID, "lavf", priv->sub_streams);
            if(!sh_sub) break;
            priv->sstreams[priv->sub_streams] = i;
            sh_sub->type = 't';
            demuxer->sub->sh = demuxer->s_streams[priv->sub_streams++];
            break;
        }
        default:
            st->discard= AVDISCARD_ALL;
    }
}
Beispiel #7
0
int64_t ff_gcd(int64_t a, int64_t b) {
    if(b)
        return ff_gcd(b, a%b);
    else
        return a;
}