decoder.c

au1200 linux2.6.11 硬件解码mae驱动和maiplayer播放器源码

    /* copy the relevant info to the decoder handle */
    *samplerate = mp4ASC.samplingFrequency;
    if (mp4ASC.channelsConfiguration)
    {
        *channels = mp4ASC.channelsConfiguration;
    } else {
        *channels = hDecoder->pce.channels;
        hDecoder->pce_set = 1;
    }
    hDecoder->sf_index = mp4ASC.samplingFrequencyIndex;
    hDecoder->object_type = mp4ASC.objectTypeIndex;
#ifdef ERROR_RESILIENCE
    hDecoder->aacSectionDataResilienceFlag = mp4ASC.aacSectionDataResilienceFlag;
    hDecoder->aacScalefactorDataResilienceFlag = mp4ASC.aacScalefactorDataResilienceFlag;
    hDecoder->aacSpectralDataResilienceFlag = mp4ASC.aacSpectralDataResilienceFlag;
#endif
#ifdef SBR_DEC
    hDecoder->sbr_present_flag = mp4ASC.sbr_present_flag;
    if (hDecoder->config.dontUpSampleImplicitSBR == 0)
        hDecoder->forceUpSampling = mp4ASC.forceUpSampling;
    else
        hDecoder->forceUpSampling = 0;

    /* AAC core decoder samplerate is 2 times as low */
    if (hDecoder->sbr_present_flag == 1 || hDecoder->forceUpSampling == 1)
    {
//printf("faacDecInit2: hDecoder->sbr_present_flag %d, hDecoder->forceUpSampling %d\n", hDecoder->sbr_present_flag, hDecoder->forceUpSampling);
        hDecoder->sf_index = get_sr_index(mp4ASC.samplingFrequency / 2);
    }
#endif

    if (rc != 0)
    {
        return rc;
    }
    hDecoder->channelConfiguration = mp4ASC.channelsConfiguration;
        if (mp4ASC.frameLengthFlag)
#ifdef ALLOW_SMALL_FRAMELENGTH
        hDecoder->frameLength = 960;
#else
        return -1;
#endif

     xheader.iFramesize = hDecoder->frameLength;
     xheader.iSBR = mp4ASC.sbr_present_flag;

    /* must be done before frameLength is divided by 2 for LD */
#ifdef SSR_DEC
    if (hDecoder->object_type == SSR)
        hDecoder->fb = ssr_filter_bank_init(hDecoder->frameLength/SSR_BANDS);
    else
#endif
        hDecoder->fb = filter_bank_init(hDecoder->frameLength);

#ifdef LD_DEC
    if (hDecoder->object_type == LD)
        hDecoder->frameLength >>= 1;
#endif

    return 0;
}

#ifdef DRM
int8_t FAADAPI faacDecInitDRM(faacDecHandle hDecoder, uint32_t samplerate,
                              uint8_t channels)
{
    uint8_t i;

    if (hDecoder == NULL)
        return 1; /* error */

    /* Special object type defined for DRM */
    hDecoder->config.defObjectType = DRM_ER_LC;

    hDecoder->config.defSampleRate = samplerate;
#ifdef ERROR_RESILIENCE // This shoudl always be defined for DRM
    hDecoder->aacSectionDataResilienceFlag = 1; /* VCB11 */
    hDecoder->aacScalefactorDataResilienceFlag = 0; /* no RVLC */
    hDecoder->aacSpectralDataResilienceFlag = 1; /* HCR */
#endif
    hDecoder->frameLength = 960;
    hDecoder->sf_index = get_sr_index(hDecoder->config.defSampleRate);
    hDecoder->object_type = hDecoder->config.defObjectType;

    if ((channels == DRMCH_STEREO) || (channels == DRMCH_SBR_STEREO))
        hDecoder->channelConfiguration = 2;
    else
        hDecoder->channelConfiguration = 1;

#ifdef SBR_DEC
    if (channels == DRMCH_SBR_LC_STEREO)
        hDecoder->lcstereo_flag = 1;
    else
        hDecoder->lcstereo_flag = 0;

    if ((channels == DRMCH_MONO) || (channels == DRMCH_STEREO))
        hDecoder->sbr_present_flag = 0;
    else
        hDecoder->sbr_present_flag = 1;

    /* Reset sbr for new initialization */
    sbrDecodeEnd(hDecoder->sbr[0]);
    hDecoder->sbr[0] = NULL;
#endif

    if (hDecoder->fb) filter_bank_end(hDecoder->fb);
    hDecoder->fb = NULL;

    /* Take care of buffers */
    if (hDecoder->sample_buffer) faad_free(hDecoder->sample_buffer);
    hDecoder->sample_buffer = NULL;
    hDecoder->alloced_channels = 0;

    for (i = 0; i < MAX_CHANNELS; i++)
    {
        hDecoder->window_shape_prev[i] = 0;

        if (hDecoder->time_out[i]) faad_free(hDecoder->time_out[i]);
        hDecoder->time_out[i] = NULL;
        if (hDecoder->fb_intermed[i]) faad_free(hDecoder->fb_intermed[i]);
        hDecoder->fb_intermed[i] = NULL;
#ifdef SSR_DEC
        if (hDecoder->ssr_overlap[i]) faad_free(hDecoder->ssr_overlap[i]);
        hDecoder->ssr_overlap[i] = NULL;
        if (hDecoder->prev_fmd[i]) faad_free(hDecoder->prev_fmd[i]);
        hDecoder->prev_fmd[i] = NULL;
#endif
#ifdef MAIN_DEC
        if (hDecoder->pred_stat[i]) faad_free(hDecoder->pred_stat[i]);
        hDecoder->pred_stat[i] = NULL;
#endif
#ifdef LTP_DEC
        hDecoder->ltp_lag[i] = 0;
        if (hDecoder->lt_pred_stat[i]) faad_free(hDecoder->lt_pred_stat[i]);
        hDecoder->lt_pred_stat[i] = NULL;
#endif
    }

    for (i = 0; i < MAX_SYNTAX_ELEMENTS; i++)
    {
#ifdef SBR_DEC
        if (hDecoder->sbr[i])
            sbrDecodeEnd(hDecoder->sbr[i]);

        hDecoder->sbr_alloced[i] = 0;
#endif
        hDecoder->element_alloced[i] = 0;
        hDecoder->element_output_channels[i] = 0;
    }

    hDecoder->fb = filter_bank_init(hDecoder->frameLength);

    return 0;
}
#endif

void FAADAPI faacDecClose(faacDecHandle hDecoder)
{
    uint8_t i;

    if (hDecoder == NULL)
        return;

#ifdef PROFILE
    printf("AAC decoder total:  %I64d cycles\n", hDecoder->cycles);
    printf("requant:            %I64d cycles\n", hDecoder->requant_cycles);
    printf("spectral_data:      %I64d cycles\n", hDecoder->spectral_cycles);
    printf("scalefactors:       %I64d cycles\n", hDecoder->scalefac_cycles);
    printf("output:             %I64d cycles\n", hDecoder->output_cycles);
#endif

    for (i = 0; i < MAX_CHANNELS; i++)
    {
        if (hDecoder->time_out[i]) faad_free(hDecoder->time_out[i]);
        if (hDecoder->fb_intermed[i]) faad_free(hDecoder->fb_intermed[i]);
#ifdef SSR_DEC
        if (hDecoder->ssr_overlap[i]) faad_free(hDecoder->ssr_overlap[i]);
        if (hDecoder->prev_fmd[i]) faad_free(hDecoder->prev_fmd[i]);
#endif
#ifdef MAIN_DEC
        if (hDecoder->pred_stat[i]) faad_free(hDecoder->pred_stat[i]);
#endif
#ifdef LTP_DEC
        if (hDecoder->lt_pred_stat[i]) faad_free(hDecoder->lt_pred_stat[i]);
#endif
    }

#ifdef SSR_DEC
    if (hDecoder->object_type == SSR)
        ssr_filter_bank_end(hDecoder->fb);
    else
#endif
        filter_bank_end(hDecoder->fb);

    drc_end(hDecoder->drc);

    if (hDecoder->sample_buffer) faad_free(hDecoder->sample_buffer);

#ifdef SBR_DEC
    for (i = 0; i < MAX_SYNTAX_ELEMENTS; i++)
    {
        if (hDecoder->sbr[i])
            sbrDecodeEnd(hDecoder->sbr[i]);
    }
#endif

    if (hDecoder) faad_free(hDecoder);
}

void FAADAPI faacDecPostSeekReset(faacDecHandle hDecoder, int32_t frame)
{
    if (hDecoder)
    {
        hDecoder->postSeekResetFlag = 1;

        if (frame != -1)
            hDecoder->frame = frame;
    }
}

static void create_channel_config(faacDecHandle hDecoder, faacDecFrameInfo *hInfo)
{
    hInfo->num_front_channels = 0;
    hInfo->num_side_channels = 0;
    hInfo->num_back_channels = 0;
    hInfo->num_lfe_channels = 0;
    
    //m emset(hInfo->channel_position, 0, MAX_CHANNELS*sizeof(uint8_t)); happens a lot, but apparently not needed

    if (hDecoder->downMatrix)
    {
        hInfo->num_front_channels = 2;
        hInfo->channel_position[0] = FRONT_CHANNEL_LEFT;
        hInfo->channel_position[1] = FRONT_CHANNEL_RIGHT;
        return;
    }

    /* check if there is a PCE */
    if (hDecoder->pce_set)
    {
        uint8_t i, chpos = 0;
        uint8_t chdir, back_center = 0;

        hInfo->num_front_channels = hDecoder->pce.num_front_channels;
        hInfo->num_side_channels = hDecoder->pce.num_side_channels;
        hInfo->num_back_channels = hDecoder->pce.num_back_channels;
        hInfo->num_lfe_channels = hDecoder->pce.num_lfe_channels;

        chdir = hInfo->num_front_channels;
        if (chdir & 1)
        {
            hInfo->channel_position[chpos++] = FRONT_CHANNEL_CENTER;
            chdir--;
        }
        for (i = 0; i < chdir; i += 2)
        {
            hInfo->channel_position[chpos++] = FRONT_CHANNEL_LEFT;
            hInfo->channel_position[chpos++] = FRONT_CHANNEL_RIGHT;
        }

        for (i = 0; i < hInfo->num_side_channels; i += 2)
        {
            hInfo->channel_position[chpos++] = SIDE_CHANNEL_LEFT;
            hInfo->channel_position[chpos++] = SIDE_CHANNEL_RIGHT;
        }

        chdir = hInfo->num_back_channels;
        if (chdir & 1)
        {
            back_center = 1;
            chdir--;
        }
        for (i = 0; i < chdir; i += 2)
        {
            hInfo->channel_position[chpos++] = BACK_CHANNEL_LEFT;
            hInfo->channel_position[chpos++] = BACK_CHANNEL_RIGHT;
        }
        if (back_center)
        {
            hInfo->channel_position[chpos++] = BACK_CHANNEL_CENTER;
        }

        for (i = 0; i < hInfo->num_lfe_channels; i++)
        {
            hInfo->channel_position[chpos++] = LFE_CHANNEL;
        }

    } else {
        switch (hDecoder->channelConfiguration)
        {
        case 1:
            hInfo->num_front_channels = 1;
            hInfo->channel_position[0] = FRONT_CHANNEL_CENTER;
            break;
        case 2:
            hInfo->num_front_channels = 2;
            hInfo->channel_position[0] = FRONT_CHANNEL_LEFT;
            hInfo->channel_position[1] = FRONT_CHANNEL_RIGHT;
            break;
        case 3:
            hInfo->num_front_channels = 3;
            hInfo->channel_position[0] = FRONT_CHANNEL_CENTER;
            hInfo->channel_position[1] = FRONT_CHANNEL_LEFT;
            hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT;
            break;
        case 4:
            hInfo->num_front_channels = 3;
            hInfo->num_back_channels = 1;
            hInfo->channel_position[0] = FRONT_CHANNEL_CENTER;
            hInfo->channel_position[1] = FRONT_CHANNEL_LEFT;
            hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT;
            hInfo->channel_position[3] = BACK_CHANNEL_CENTER;
            break;
        case 5:
            hInfo->num_front_channels = 3;
            hInfo->num_back_channels = 2;
            hInfo->channel_position[0] = FRONT_CHANNEL_CENTER;
            hInfo->channel_position[1] = FRONT_CHANNEL_LEFT;
            hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT;
            hInfo->channel_position[3] = BACK_CHANNEL_LEFT;
            hInfo->channel_position[4] = BACK_CHANNEL_RIGHT;
            break;
        case 6:
            hInfo->num_front_channels = 3;
            hInfo->num_back_channels = 2;
            hInfo->num_lfe_channels = 1;
            hInfo->channel_position[0] = FRONT_CHANNEL_CENTER;
            hInfo->channel_position[1] = FRONT_CHANNEL_LEFT;
            hInfo->channel_position[2] = FRONT_CHANNEL_RIGHT;
            hInfo->channel_position[3] = BACK_CHANNEL_LEFT;
            hInfo->channel_position[4] = BACK_CHANNEL_RIGHT;
            hInfo->channel_position[5] = LFE_CHANNEL;
            break;
        case 7:
            hInfo->num_front_channels = 3;