Commit message: Fix a couple buffer overflows

https://hackerone.com/reports/502816
https://hackerone.com/reports/507858

https://github.com/videolan/vlc/blob/master/contrib/src/faad2/faad2-fix-overflows.patch
CVE: CVE-2019-15296
CWE: CWE-119
Vulnerability description: An issue was discovered in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8. The faad_resetbits function in libfaad/bits.c is affected by a buffer overflow vulnerability. The number of bits to be read is determined by ld->buffer_size - words*4, cast to uint32. If ld->buffer_size - words*4 is negative, a buffer overflow is later performed via getdword_n(&ld->start[words], ld->bytes_left).

Project: faad2
File: bits.c

uint8_t faad_byte_align(bitfile *ld)
{
    int remainder = (32 - ld->bits_left) & 0x7;

    if (remainder)
    {
        faad_flushbits(ld, 8 - remainder);
        return (uint8_t)(8 - remainder);
    }
    return 0;
}

Project: faad2
File: bits.c

uint32_t faad_get_processed_bits(bitfile *ld)
{
    return (uint32_t)(8 * (4*(ld->tail - ld->start) - 4) - (ld->bits_left));
}

Project: faad2
File: bits.c

uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits
                       DEBUGDEC)
{
    int i;
    unsigned int temp;
    int bytes = bits >> 3;
    int remainder = bits & 0x7;

    uint8_t *buffer = (uint8_t*)faad_malloc((bytes+1)*sizeof(uint8_t));

    for (i = 0; i < bytes; i++)
    {
        buffer[i] = (uint8_t)faad_getbits(ld, 8 DEBUGVAR(print,var,dbg));
    }

    if (remainder)
    {
        temp = faad_getbits(ld, remainder DEBUGVAR(print,var,dbg)) << (8-remainder);

        buffer[bytes] = (uint8_t)temp;
    }

    return buffer;
}

Project: faad2

void faad_initbits(bitfile *ld, const void *_buffer, const uint32_t buffer_size)
{
    uint32_t tmp;

    if (ld == NULL)
        return;


    if (buffer_size == 0 || _buffer == NULL)
    {
        ld->error = 1;
        return;
    }

    ld->buffer = _buffer;

    ld->buffer_size = buffer_size;
    ld->bytes_left  = buffer_size;

    if (ld->bytes_left >= 4)
    {
        tmp = getdword((uint32_t*)ld->buffer);
        ld->bytes_left -= 4;
    } else {
        tmp = getdword_n((uint32_t*)ld->buffer, ld->bytes_left);
        ld->bytes_left = 0;
    }
    ld->bufa = tmp;

    if (ld->bytes_left >= 4)
    {
        tmp = getdword((uint32_t*)ld->buffer + 1);
        ld->bytes_left -= 4;
    } else {
        tmp = getdword_n((uint32_t*)ld->buffer + 1, ld->bytes_left);
        ld->bytes_left = 0;
    }
    ld->bufb = tmp;

    ld->start = (uint32_t*)ld->buffer;
    ld->tail = ((uint32_t*)ld->buffer + 2);

    ld->bits_left = 32;

    ld->error = 0;
}

Project: faad2
File: bits.c

uint32_t faad_origbitbuffer_size(bitfile *ld)
{
    return ld->buffer_size;
}

Project: faad2
File: bits.c

void faad_rewindbits(bitfile *ld)
{
    uint32_t tmp;

    ld->bytes_left = ld->buffer_size;

    if (ld->bytes_left >= 4)
    {
        tmp = getdword((uint32_t*)&ld->start[0]);
        ld->bytes_left -= 4;
    } else {
        tmp = getdword_n((uint32_t*)&ld->start[0], ld->bytes_left);
        ld->bytes_left = 0;
    }
    ld->bufa = tmp;

    if (ld->bytes_left >= 4)
    {
        tmp = getdword((uint32_t*)&ld->start[1]);
        ld->bytes_left -= 4;
    } else {
        tmp = getdword_n((uint32_t*)&ld->start[1], ld->bytes_left);
        ld->bytes_left = 0;
    }
    ld->bufb = tmp;

    ld->bits_left = 32;
    ld->tail = &ld->start[2];
}

Project: faad2
File: syntax.c

void DRM_aac_scalable_main_element(NeAACDecStruct *hDecoder, NeAACDecFrameInfo *hInfo,
                                   bitfile *ld, program_config *pce, drc_info *drc)
{
    uint8_t retval = 0;
    uint8_t channels = hDecoder->fr_channels = 0;
    uint8_t ch;
    uint8_t this_layer_stereo = (hDecoder->channelConfiguration > 1) ? 1 : 0;
    element cpe = {0};
    ic_stream *ics1 = &(cpe.ics1);
    ic_stream *ics2 = &(cpe.ics2);
    int16_t *spec_data;
    ALIGN int16_t spec_data1[1024] = {0};
    ALIGN int16_t spec_data2[1024] = {0};

    hDecoder->fr_ch_ele = 0;

    hInfo->error = DRM_aac_scalable_main_header(hDecoder, ics1, ics2, ld, this_layer_stereo);
    if (hInfo->error > 0)
        return;

    cpe.common_window = 1;
    if (this_layer_stereo)
    {
        hDecoder->element_id[0] = ID_CPE;
        if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 0)
            hDecoder->element_output_channels[hDecoder->fr_ch_ele] = 2;
    } else {
        hDecoder->element_id[0] = ID_SCE;
    }

    if (this_layer_stereo)
    {
        cpe.channel        = 0;
        cpe.paired_channel = 1;
    }


    /* Stereo2 / Mono1 */
    ics1->tns_data_present = faad_get1bit(ld);

#if defined(LTP_DEC)
    ics1->ltp.data_present = faad_get1bit(ld);
#elif defined (DRM)
    if(faad_get1bit(ld)) {
         hInfo->error = 26;
         return;
    }
#else
    faad_get1bit(ld);
#endif    

    hInfo->error = side_info(hDecoder, &cpe, ld, ics1, 1);
    if (hInfo->error > 0)
        return;
    if (this_layer_stereo)
    {
        /* Stereo3 */
        ics2->tns_data_present = faad_get1bit(ld);
#ifdef LTP_DEC
        ics1->ltp.data_present =
#endif
            faad_get1bit(ld);
        hInfo->error = side_info(hDecoder, &cpe, ld, ics2, 1);
        if (hInfo->error > 0)
            return;
    }
    /* Stereo4 / Mono2 */
    if (ics1->tns_data_present)
        tns_data(ics1, &(ics1->tns), ld);
    if (this_layer_stereo)
    {
        /* Stereo5 */
        if (ics2->tns_data_present)
            tns_data(ics2, &(ics2->tns), ld);
    }

#ifdef DRM
    /* CRC check */
    if (hDecoder->object_type == DRM_ER_LC)
    {
        if ((hInfo->error = (uint8_t)faad_check_CRC(ld, (uint16_t)faad_get_processed_bits(ld) - 8)) > 0)
            return;
    }
#endif

    /* Stereo6 / Mono3 */
    /* error resilient spectral data decoding */
    if ((hInfo->error = reordered_spectral_data(hDecoder, ics1, ld, spec_data1)) > 0)
    {
        return;
    }
    if (this_layer_stereo)
    {
        /* Stereo7 */
        /* error resilient spectral data decoding */
        if ((hInfo->error = reordered_spectral_data(hDecoder, ics2, ld, spec_data2)) > 0)
        {
            return;
        }
    }


#ifdef DRM
#ifdef SBR_DEC
    /* In case of DRM we need to read the SBR info before channel reconstruction */
    if ((hDecoder->sbr_present_flag == 1) && (hDecoder->object_type == DRM_ER_LC))
    {
        bitfile ld_sbr = {0};
        uint32_t i;
        uint16_t count = 0;
        uint8_t *revbuffer;
        uint8_t *prevbufstart;
        uint8_t *pbufend;

        /* all forward bitreading should be finished at this point */
        uint32_t bitsconsumed = faad_get_processed_bits(ld);
        uint32_t buffer_size = faad_origbitbuffer_size(ld);
        uint8_t *buffer = (uint8_t*)faad_origbitbuffer(ld);

        if (bitsconsumed + 8 > buffer_size*8)
        {
            hInfo->error = 14;
            return;
        }

        if (!hDecoder->sbr[0])
        {
            hDecoder->sbr[0] = sbrDecodeInit(hDecoder->frameLength, hDecoder->element_id[0],
                2*get_sample_rate(hDecoder->sf_index), 0 /* ds SBR */, 1);
        }

        /* Reverse bit reading of SBR data in DRM audio frame */
        revbuffer = (uint8_t*)faad_malloc(buffer_size*sizeof(uint8_t));
        prevbufstart = revbuffer;
        pbufend = &buffer[buffer_size - 1];
        for (i = 0; i < buffer_size; i++)
            *prevbufstart++ = tabFlipbits[*pbufend--];

        /* Set SBR data */
        /* consider 8 bits from AAC-CRC */
        /* SBR buffer size is original buffer size minus AAC buffer size */
        count = (uint16_t)bit2byte(buffer_size*8 - bitsconsumed);
        faad_initbits(&ld_sbr, revbuffer, count);

        hDecoder->sbr[0]->sample_rate = get_sample_rate(hDecoder->sf_index);
        hDecoder->sbr[0]->sample_rate *= 2;

        faad_getbits(&ld_sbr, 8); /* Skip 8-bit CRC */

        hDecoder->sbr[0]->ret = sbr_extension_data(&ld_sbr, hDecoder->sbr[0], count, hDecoder->postSeekResetFlag);
#if (defined(PS_DEC) || defined(DRM_PS))
        if (hDecoder->sbr[0]->ps_used)
        {
            hDecoder->ps_used[0] = 1;
            hDecoder->ps_used_global = 1;
        }
#endif

        if (ld_sbr.error)
        {
            hDecoder->sbr[0]->ret = 1;
        }

        /* check CRC */
        /* no need to check it if there was already an error */
        if (hDecoder->sbr[0]->ret == 0)
            hDecoder->sbr[0]->ret = (uint8_t)faad_check_CRC(&ld_sbr, (uint16_t)faad_get_processed_bits(&ld_sbr) - 8);

        /* SBR data was corrupted, disable it until the next header */
        if (hDecoder->sbr[0]->ret != 0)
        {
            hDecoder->sbr[0]->header_count = 0;
        }

        faad_endbits(&ld_sbr);

        if (revbuffer)
            faad_free(revbuffer);
    }
#endif
#endif

    if (this_layer_stereo)
    {
        hInfo->error = reconstruct_channel_pair(hDecoder, ics1, ics2, &cpe, spec_data1, spec_data2);
        if (hInfo->error > 0)
            return;
    } else {
        hInfo->error = reconstruct_single_channel(hDecoder, ics1, &cpe, spec_data1);
        if (hInfo->error > 0)
            return;
    }

    /* map output channels position to internal data channels */
    if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 2)
    {
        /* this might be faulty when pce_set is true */
        hDecoder->internal_channel[channels] = channels;
        hDecoder->internal_channel[channels+1] = channels+1;
    } else {
        hDecoder->internal_channel[channels] = channels;
    }

    hDecoder->fr_channels += hDecoder->element_output_channels[hDecoder->fr_ch_ele];
    hDecoder->fr_ch_ele++;

    return;
}

Project: faad2
File: syntax.c

static int8_t DRM_aac_scalable_main_header(NeAACDecStruct *hDecoder, ic_stream *ics1, ic_stream *ics2,
                                           bitfile *ld, uint8_t this_layer_stereo)
{
    uint8_t retval = 0;
    uint8_t ch;
    ic_stream *ics;
    uint8_t ics_reserved_bit;

    ics_reserved_bit = faad_get1bit(ld
        DEBUGVAR(1,300,"aac_scalable_main_header(): ics_reserved_bits"));
    if (ics_reserved_bit != 0)
        return 32;
    ics1->window_sequence = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,301,"aac_scalable_main_header(): window_sequence"));
    ics1->window_shape = faad_get1bit(ld
        DEBUGVAR(1,302,"aac_scalable_main_header(): window_shape"));

    if (ics1->window_sequence == EIGHT_SHORT_SEQUENCE)
    {
        ics1->max_sfb = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,303,"aac_scalable_main_header(): max_sfb (short)"));
        ics1->scale_factor_grouping = (uint8_t)faad_getbits(ld, 7
            DEBUGVAR(1,304,"aac_scalable_main_header(): scale_factor_grouping"));
    } else {
        ics1->max_sfb = (uint8_t)faad_getbits(ld, 6
            DEBUGVAR(1,305,"aac_scalable_main_header(): max_sfb (long)"));
    }

    /* get the grouping information */
    if ((retval = window_grouping_info(hDecoder, ics1)) > 0)
        return retval;

    /* should be an error */
    /* check the range of max_sfb */
    if (ics1->max_sfb > ics1->num_swb)
        return 16;

    if (this_layer_stereo)
    {
        ics1->ms_mask_present = (uint8_t)faad_getbits(ld, 2
            DEBUGVAR(1,306,"aac_scalable_main_header(): ms_mask_present"));
        if (ics1->ms_mask_present == 3)
        {
            /* bitstream error */
            return 32;
        }
        if (ics1->ms_mask_present == 1)
        {
            uint8_t g, sfb;
            for (g = 0; g < ics1->num_window_groups; g++)
            {
                for (sfb = 0; sfb < ics1->max_sfb; sfb++)
                {
                    ics1->ms_used[g][sfb] = faad_get1bit(ld
                        DEBUGVAR(1,307,"aac_scalable_main_header(): faad_get1bit"));
                }
            }
        }

        memcpy(ics2, ics1, sizeof(ic_stream));
    } else {
        ics1->ms_mask_present = 0;
    }

    return 0;
}

Project: faad2
File: syntax.c

static void adts_error_check(adts_header *adts, bitfile *ld)
{
    if (adts->protection_absent == 0)
    {
        adts->crc_check = (uint16_t)faad_getbits(ld, 16
            DEBUGVAR(1,134,"adts_error_check(): crc_check"));
    }
}

Project: faad2
File: syntax.c

static uint8_t adts_fixed_header(adts_header *adts, bitfile *ld)
{
    uint16_t i;
    uint8_t sync_err = 1;

    /* try to recover from sync errors */
    for (i = 0; i < 768; i++)
    {
        adts->syncword = (uint16_t)faad_showbits(ld, 12);
        if (adts->syncword != 0xFFF)
        {
            faad_getbits(ld, 8
                DEBUGVAR(0,0,""));
        } else {
            sync_err = 0;
            faad_getbits(ld, 12
                DEBUGVAR(1,118,"adts_fixed_header(): syncword"));
            break;
        }
    }
    if (sync_err)
        return 5;

    adts->id = faad_get1bit(ld
        DEBUGVAR(1,119,"adts_fixed_header(): id"));
    adts->layer = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,120,"adts_fixed_header(): layer"));
    adts->protection_absent = faad_get1bit(ld
        DEBUGVAR(1,121,"adts_fixed_header(): protection_absent"));
    adts->profile = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,122,"adts_fixed_header(): profile"));
    adts->sf_index = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,123,"adts_fixed_header(): sf_index"));
    adts->private_bit = faad_get1bit(ld
        DEBUGVAR(1,124,"adts_fixed_header(): private_bit"));
    adts->channel_configuration = (uint8_t)faad_getbits(ld, 3
        DEBUGVAR(1,125,"adts_fixed_header(): channel_configuration"));
    adts->original = faad_get1bit(ld
        DEBUGVAR(1,126,"adts_fixed_header(): original"));
    adts->home = faad_get1bit(ld
        DEBUGVAR(1,127,"adts_fixed_header(): home"));

    if (adts->old_format == 1)
    {
        /* Removed in corrigendum 14496-3:2002 */
        if (adts->id == 0)
        {
            adts->emphasis = (uint8_t)faad_getbits(ld, 2
                DEBUGVAR(1,128,"adts_fixed_header(): emphasis"));
        }
    }

    return 0;
}

Project: faad2
File: syntax.c

uint8_t adts_frame(adts_header *adts, bitfile *ld)
{
    /* faad_byte_align(ld); */
    if (adts_fixed_header(adts, ld))
        return 5;
    adts_variable_header(adts, ld);
    adts_error_check(adts, ld);

    return 0;
}

Project: faad2
File: syntax.c

static void adts_variable_header(adts_header *adts, bitfile *ld)
{
    adts->copyright_identification_bit = faad_get1bit(ld
        DEBUGVAR(1,129,"adts_variable_header(): copyright_identification_bit"));
    adts->copyright_identification_start = faad_get1bit(ld
        DEBUGVAR(1,130,"adts_variable_header(): copyright_identification_start"));
    adts->aac_frame_length = (uint16_t)faad_getbits(ld, 13
        DEBUGVAR(1,131,"adts_variable_header(): aac_frame_length"));
    adts->adts_buffer_fullness = (uint16_t)faad_getbits(ld, 11
        DEBUGVAR(1,132,"adts_variable_header(): adts_buffer_fullness"));
    adts->no_raw_data_blocks_in_frame = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,133,"adts_variable_header(): no_raw_data_blocks_in_frame"));
}

Project: faad2
File: syntax.c

static uint8_t channel_pair_element(NeAACDecStruct *hDecoder, bitfile *ld,
                                    uint8_t channels, uint8_t *tag)
{
    ALIGN int16_t spec_data1[1024] = {0};
    ALIGN int16_t spec_data2[1024] = {0};
    element cpe = {0};
    ic_stream *ics1 = &(cpe.ics1);
    ic_stream *ics2 = &(cpe.ics2);
    uint8_t result;

    cpe.channel        = channels;
    cpe.paired_channel = channels+1;

    cpe.element_instance_tag = (uint8_t)faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,39,"channel_pair_element(): element_instance_tag"));
    *tag = cpe.element_instance_tag;

    if ((cpe.common_window = faad_get1bit(ld
        DEBUGVAR(1,40,"channel_pair_element(): common_window"))) & 1)
    {
        /* both channels have common ics information */
        if ((result = ics_info(hDecoder, ics1, ld, cpe.common_window)) > 0)
            return result;

        ics1->ms_mask_present = (uint8_t)faad_getbits(ld, 2
            DEBUGVAR(1,41,"channel_pair_element(): ms_mask_present"));
        if (ics1->ms_mask_present == 3)
        {
            /* bitstream error */
            return 32;
        }
        if (ics1->ms_mask_present == 1)
        {
            uint8_t g, sfb;
            for (g = 0; g < ics1->num_window_groups; g++)
            {
                for (sfb = 0; sfb < ics1->max_sfb; sfb++)
                {
                    ics1->ms_used[g][sfb] = faad_get1bit(ld
                        DEBUGVAR(1,42,"channel_pair_element(): faad_get1bit"));
                }
            }
        }

#ifdef ERROR_RESILIENCE
        if ((hDecoder->object_type >= ER_OBJECT_START) && (ics1->predictor_data_present))
        {
            if ((
#ifdef LTP_DEC
                ics1->ltp.data_present =
#endif
                faad_get1bit(ld DEBUGVAR(1,50,"channel_pair_element(): ltp.data_present"))) & 1)
            {
#ifdef LTP_DEC
                if ((result = ltp_data(hDecoder, ics1, &(ics1->ltp), ld)) > 0)
                {
                    return result;
                }
#else
                return 26;
#endif
            }
        }
#endif

        memcpy(ics2, ics1, sizeof(ic_stream));
    } else {
        ics1->ms_mask_present = 0;
    }

    if ((result = individual_channel_stream(hDecoder, &cpe, ld, ics1,
        0, spec_data1)) > 0)
    {
        return result;
    }

#ifdef ERROR_RESILIENCE
    if (cpe.common_window && (hDecoder->object_type >= ER_OBJECT_START) &&
        (ics1->predictor_data_present))
    {
        if ((
#ifdef LTP_DEC
            ics1->ltp2.data_present =
#endif
            faad_get1bit(ld DEBUGVAR(1,50,"channel_pair_element(): ltp.data_present"))) & 1)
        {
#ifdef LTP_DEC
            if ((result = ltp_data(hDecoder, ics1, &(ics1->ltp2), ld)) > 0)
            {
                return result;
            }
#else
            return 26;
#endif
        }
    }
#endif

    if ((result = individual_channel_stream(hDecoder, &cpe, ld, ics2,
        0, spec_data2)) > 0)
    {
        return result;
    }

#ifdef SBR_DEC
    /* check if next bitstream element is a fill element */
    /* if so, read it now so SBR decoding can be done in case of a file with SBR */
    if (faad_showbits(ld, LEN_SE_ID) == ID_FIL)
    {
        faad_flushbits(ld, LEN_SE_ID);

        /* one sbr_info describes a channel_element not a channel! */
        if ((result = fill_element(hDecoder, ld, hDecoder->drc, hDecoder->fr_ch_ele)) > 0)
        {
            return result;
        }
    }
#endif

    /* noiseless coding is done, spectral reconstruction is done now */
    if ((result = reconstruct_channel_pair(hDecoder, ics1, ics2, &cpe,
        spec_data1, spec_data2)) > 0)
    {
        return result;
    }

    return 0;
}

Project: faad2
File: syntax.c

static uint8_t coupling_channel_element(NeAACDecStruct *hDecoder, bitfile *ld)
{
    uint8_t c, result = 0;
    uint8_t ind_sw_cce_flag = 0;
    uint8_t num_gain_element_lists = 0;
    uint8_t num_coupled_elements = 0;

    element el_empty = {0};
    ic_stream ics_empty = {0};
    int16_t sh_data[1024];

    c = faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,900,"coupling_channel_element(): element_instance_tag"));

    ind_sw_cce_flag = faad_get1bit(ld
        DEBUGVAR(1,901,"coupling_channel_element(): ind_sw_cce_flag"));
    num_coupled_elements = faad_getbits(ld, 3
        DEBUGVAR(1,902,"coupling_channel_element(): num_coupled_elements"));

    for (c = 0; c < num_coupled_elements + 1; c++)
    {
        uint8_t cc_target_is_cpe, cc_target_tag_select;

        num_gain_element_lists++;

        cc_target_is_cpe = faad_get1bit(ld
            DEBUGVAR(1,903,"coupling_channel_element(): cc_target_is_cpe"));
        cc_target_tag_select = faad_getbits(ld, 4
            DEBUGVAR(1,904,"coupling_channel_element(): cc_target_tag_select"));

        if (cc_target_is_cpe)
        {
            uint8_t cc_l = faad_get1bit(ld
                DEBUGVAR(1,905,"coupling_channel_element(): cc_l"));
            uint8_t cc_r = faad_get1bit(ld
                DEBUGVAR(1,906,"coupling_channel_element(): cc_r"));

            if (cc_l && cc_r)
                num_gain_element_lists++;
        }
    }

    faad_get1bit(ld
        DEBUGVAR(1,907,"coupling_channel_element(): cc_domain"));
    faad_get1bit(ld
        DEBUGVAR(1,908,"coupling_channel_element(): gain_element_sign"));
    faad_getbits(ld, 2
        DEBUGVAR(1,909,"coupling_channel_element(): gain_element_scale"));

    if ((result = individual_channel_stream(hDecoder, &el_empty, ld, &ics_empty,
        0, sh_data)) > 0)
    {
        return result;
    }

    /* IS not allowed in single channel */
    if (ics->is_used)
        return 32;

    for (c = 1; c < num_gain_element_lists; c++)
    {
        uint8_t cge;

        if (ind_sw_cce_flag)
        {
            cge = 1;
        } else {
            cge = faad_get1bit(ld
                DEBUGVAR(1,910,"coupling_channel_element(): common_gain_element_present"));
        }

        if (cge)
        {
            huffman_scale_factor(ld);
        } else {
            uint8_t g, sfb;

            for (g = 0; g < ics_empty.num_window_groups; g++)
            {
                for (sfb = 0; sfb < ics_empty.max_sfb; sfb++)
                {
                    if (ics_empty.sfb_cb[g][sfb] != ZERO_HCB)
                        huffman_scale_factor(ld);
                }
            }
        }
    }

    return 0;
}

Project: faad2
File: syntax.c

static uint16_t data_stream_element(NeAACDecStruct *hDecoder, bitfile *ld)
{
    uint8_t byte_aligned;
    uint16_t i, count;

    /* element_instance_tag = */ faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,60,"data_stream_element(): element_instance_tag"));
    byte_aligned = faad_get1bit(ld
        DEBUGVAR(1,61,"data_stream_element(): byte_aligned"));
    count = (uint16_t)faad_getbits(ld, 8
        DEBUGVAR(1,62,"data_stream_element(): count"));
    if (count == 255)
    {
        count += (uint16_t)faad_getbits(ld, 8
            DEBUGVAR(1,63,"data_stream_element(): extra count"));
    }
    if (byte_aligned)
        faad_byte_align(ld);

    for (i = 0; i < count; i++)
    {
        faad_getbits(ld, LEN_BYTE
            DEBUGVAR(1,64,"data_stream_element(): data_stream_byte"));
    }

    return count;
}

Project: faad2
File: syntax.c

static void decode_cpe(NeAACDecStruct *hDecoder, NeAACDecFrameInfo *hInfo, bitfile *ld,
                       uint8_t id_syn_ele)
{
    uint8_t channels = hDecoder->fr_channels;
    uint8_t tag = 0;

    if (channels+2 > MAX_CHANNELS)
    {
        hInfo->error = 12;
        return;
    }
    if (hDecoder->fr_ch_ele+1 > MAX_SYNTAX_ELEMENTS)
    {
        hInfo->error = 13;
        return;
    }

    /* for CPE the number of output channels is always 2 */
    if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 0)
    {
        /* element_output_channels not set yet */
        hDecoder->element_output_channels[hDecoder->fr_ch_ele] = 2;
    } else if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] != 2) {
        /* element inconsistency */
        hInfo->error = 21;
        return;
    }

    if (hDecoder->frame && hDecoder->element_id[hDecoder->fr_ch_ele] != id_syn_ele) {
        /* element inconsistency */
        hInfo->error = 21;
        return;
    }

    /* save the syntax element id */
    hDecoder->element_id[hDecoder->fr_ch_ele] = id_syn_ele;

    /* decode the element */
    hInfo->error = channel_pair_element(hDecoder, ld, channels, &tag);

    /* map output channel position to internal data channels */
    if (hDecoder->pce_set)
    {
        hDecoder->internal_channel[hDecoder->pce.cpe_channel[tag]] = channels;
        hDecoder->internal_channel[hDecoder->pce.cpe_channel[tag]+1] = channels+1;
    } else {
        hDecoder->internal_channel[channels] = channels;
        hDecoder->internal_channel[channels+1] = channels+1;
    }

    hDecoder->fr_channels += 2;
    hDecoder->fr_ch_ele++;
}

Project: faad2

static uint8_t decode_scale_factors(ic_stream *ics, bitfile *ld)
{
    uint8_t g, sfb;
    int16_t t;
    int8_t noise_pcm_flag = 1;

    int16_t scale_factor = ics->global_gain;
    int16_t is_position = 0;
    int16_t noise_energy = ics->global_gain - 90;

    for (g = 0; g < ics->num_window_groups; g++)
    {
        for (sfb = 0; sfb < ics->max_sfb; sfb++)
        {
            switch (ics->sfb_cb[g][sfb])
            {
            case ZERO_HCB: /* zero book */
                ics->scale_factors[g][sfb] = 0;
#ifdef SF_PRINT
                printf("%d\n", ics->scale_factors[g][sfb]);
#endif
                break;
            case INTENSITY_HCB: /* intensity books */
            case INTENSITY_HCB2:

                /* decode intensity position */
                t = huffman_scale_factor(ld);
                is_position += (t - 60);
                ics->scale_factors[g][sfb] = is_position;
#ifdef SF_PRINT
                printf("%d\n", ics->scale_factors[g][sfb]);
#endif

                break;
            case NOISE_HCB: /* noise books */

#ifndef DRM
                /* decode noise energy */
                if (noise_pcm_flag)
                {
                    noise_pcm_flag = 0;
                    t = (int16_t)faad_getbits(ld, 9
                        DEBUGVAR(1,73,"scale_factor_data(): first noise")) - 256;
                } else {
                    t = huffman_scale_factor(ld);
                    t -= 60;
                }
                noise_energy += t;
                ics->scale_factors[g][sfb] = noise_energy;
#ifdef SF_PRINT
                printf("%d\n", ics->scale_factors[g][sfb]);
#endif
#else
                /* PNS not allowed in DRM */
                return 29;
#endif

                break;
            default: /* spectral books */

                /* ics->scale_factors[g][sfb] must be between 0 and 255 */

                ics->scale_factors[g][sfb] = 0;

                /* decode scale factor */
                t = huffman_scale_factor(ld);
                scale_factor += (t - 60);
                if (scale_factor < 0 || scale_factor > 255)
                    return 4;
                ics->scale_factors[g][sfb] = scale_factor;
#ifdef SF_PRINT
                printf("%d\n", ics->scale_factors[g][sfb]);
#endif

                break;
            }
        }
    }

    return 0;
}

Project: faad2
File: syntax.c

static void decode_sce_lfe(NeAACDecStruct *hDecoder,
                           NeAACDecFrameInfo *hInfo, bitfile *ld,
                           uint8_t id_syn_ele)
{
    uint8_t channels = hDecoder->fr_channels;
    uint8_t tag = 0;

    if (channels+1 > MAX_CHANNELS)
    {
        hInfo->error = 12;
        return;
    }
    if (hDecoder->fr_ch_ele+1 > MAX_SYNTAX_ELEMENTS)
    {
        hInfo->error = 13;
        return;
    }

    /* for SCE hDecoder->element_output_channels[] is not set here because this
       can become 2 when some form of Parametric Stereo coding is used
    */

    if (hDecoder->frame && hDecoder->element_id[hDecoder->fr_ch_ele] != id_syn_ele) {
        /* element inconsistency */
        hInfo->error = 21;
        return;
    }

    /* save the syntax element id */
    hDecoder->element_id[hDecoder->fr_ch_ele] = id_syn_ele;

    /* decode the element */
    hInfo->error = single_lfe_channel_element(hDecoder, ld, channels, &tag);

    /* map output channels position to internal data channels */
    if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 2)
    {
        /* this might be faulty when pce_set is true */
        hDecoder->internal_channel[channels] = channels;
        hDecoder->internal_channel[channels+1] = channels+1;
    } else {
        if (hDecoder->pce_set)
            hDecoder->internal_channel[hDecoder->pce.sce_channel[tag]] = channels;
        else
            hDecoder->internal_channel[channels] = channels;
    }

    hDecoder->fr_channels += hDecoder->element_output_channels[hDecoder->fr_ch_ele];
    hDecoder->fr_ch_ele++;
}

Project: faad2
File: syntax.c

static uint16_t extension_payload(bitfile *ld, drc_info *drc, uint16_t count)
{
    uint16_t i, n, dataElementLength;
    uint8_t dataElementLengthPart;
    uint8_t align = 4, data_element_version, loopCounter;

    uint8_t extension_type = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,87,"extension_payload(): extension_type"));

    switch (extension_type)
    {
    case EXT_DYNAMIC_RANGE:
        drc->present = 1;
        n = dynamic_range_info(ld, drc);
        return n;
    case EXT_FILL_DATA:
        /* fill_nibble = */ faad_getbits(ld, 4
            DEBUGVAR(1,136,"extension_payload(): fill_nibble")); /* must be 0000 */
        for (i = 0; i < count-1; i++)
        {
            /* fill_byte[i] = */ faad_getbits(ld, 8
                DEBUGVAR(1,88,"extension_payload(): fill_byte")); /* must be 10100101 */
        }
        return count;
    case EXT_DATA_ELEMENT:
        data_element_version = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,400,"extension_payload(): data_element_version"));
        switch (data_element_version)
        {
        case ANC_DATA:
            loopCounter = 0;
            dataElementLength = 0;
            do {
                dataElementLengthPart = (uint8_t)faad_getbits(ld, 8
                    DEBUGVAR(1,401,"extension_payload(): dataElementLengthPart"));
                dataElementLength += dataElementLengthPart;
                loopCounter++;
            } while (dataElementLengthPart == 255);

            for (i = 0; i < dataElementLength; i++)
            {
                /* data_element_byte[i] = */ faad_getbits(ld, 8
                    DEBUGVAR(1,402,"extension_payload(): data_element_byte"));
                return (dataElementLength+loopCounter+1);
            }
        default:
            align = 0;
        }
    case EXT_FIL:
    default:
        faad_getbits(ld, align
            DEBUGVAR(1,88,"extension_payload(): fill_nibble"));
        for (i = 0; i < count-1; i++)
        {
            /* other_bits[i] = */ faad_getbits(ld, 8
               DEBUGVAR(1,89,"extension_payload(): fill_bit"));
        }
        return count;
    }
}

Project: faad2
File: syntax.c

static uint8_t fill_element(NeAACDecStruct *hDecoder, bitfile *ld, drc_info *drc
#ifdef SBR_DEC
                            ,uint8_t sbr_ele
#endif
                            )
{
    uint16_t count;
#ifdef SBR_DEC
    uint8_t bs_extension_type;
#endif

    count = (uint16_t)faad_getbits(ld, 4
        DEBUGVAR(1,65,"fill_element(): count"));
    if (count == 15)
    {
        count += (uint16_t)faad_getbits(ld, 8
            DEBUGVAR(1,66,"fill_element(): extra count")) - 1;
    }

    if (count > 0)
    {
#ifdef SBR_DEC
        bs_extension_type = (uint8_t)faad_showbits(ld, 4);

        if ((bs_extension_type == EXT_SBR_DATA) ||
            (bs_extension_type == EXT_SBR_DATA_CRC))
        {
            if (sbr_ele == INVALID_SBR_ELEMENT)
                return 24;

            if (!hDecoder->sbr[sbr_ele])
            {
                hDecoder->sbr[sbr_ele] = sbrDecodeInit(hDecoder->frameLength,
                    hDecoder->element_id[sbr_ele], 2*get_sample_rate(hDecoder->sf_index),
                    hDecoder->downSampledSBR
#ifdef DRM
                    , 0
#endif
                    );
            }

            hDecoder->sbr_present_flag = 1;

            /* parse the SBR data */
            hDecoder->sbr[sbr_ele]->ret = sbr_extension_data(ld, hDecoder->sbr[sbr_ele], count,
                hDecoder->postSeekResetFlag);

#if 0
            if (hDecoder->sbr[sbr_ele]->ret > 0)
            {
                printf("%s\n", NeAACDecGetErrorMessage(hDecoder->sbr[sbr_ele]->ret));
            }
#endif

#if (defined(PS_DEC) || defined(DRM_PS))
            if (hDecoder->sbr[sbr_ele]->ps_used)
            {
                hDecoder->ps_used[sbr_ele] = 1;

                /* set element independent flag to 1 as well */
                hDecoder->ps_used_global = 1;
            }
#endif
        } else {
#endif
#ifndef DRM
            while (count > 0)
            {
                count -= extension_payload(ld, drc, count);
            }
#else
            return 30;
#endif
#ifdef SBR_DEC
        }
#endif
    }

    return 0;
}

Project: faad2
File: syntax.c

static void gain_control_data(bitfile *ld, ic_stream *ics)
{
    uint8_t bd, wd, ad;
    ssr_info *ssr = &(ics->ssr);

    ssr->max_band = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,1000,"gain_control_data(): max_band"));

    if (ics->window_sequence == ONLY_LONG_SEQUENCE)
    {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 1; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));
                    ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 5
                        DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                }
            }
        }
    } else if (ics->window_sequence == LONG_START_SEQUENCE) {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 2; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));
                    if (wd == 0)
                    {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    } else {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 2
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    }
                }
            }
        }
    } else if (ics->window_sequence == EIGHT_SHORT_SEQUENCE) {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 8; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));
                    ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 2
                        DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                }
            }
        }
    } else if (ics->window_sequence == LONG_STOP_SEQUENCE) {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 2; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));

                    if (wd == 0)
                    {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    } else {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 5
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    }
                }
            }
        }
    }
}

Project: faad2
File: syntax.c

void get_adif_header(adif_header *adif, bitfile *ld)
{
    uint8_t i;

    /* adif_id[0] = */ faad_getbits(ld, 8
        DEBUGVAR(1,106,"get_adif_header(): adif_id[0]"));
    /* adif_id[1] = */ faad_getbits(ld, 8
        DEBUGVAR(1,107,"get_adif_header(): adif_id[1]"));
    /* adif_id[2] = */ faad_getbits(ld, 8
        DEBUGVAR(1,108,"get_adif_header(): adif_id[2]"));
    /* adif_id[3] = */ faad_getbits(ld, 8
        DEBUGVAR(1,109,"get_adif_header(): adif_id[3]"));
    adif->copyright_id_present = faad_get1bit(ld
        DEBUGVAR(1,110,"get_adif_header(): copyright_id_present"));
    if(adif->copyright_id_present)
    {
        for (i = 0; i < 72/8; i++)
        {
            adif->copyright_id[i] = (int8_t)faad_getbits(ld, 8
                DEBUGVAR(1,111,"get_adif_header(): copyright_id"));
        }
        adif->copyright_id[i] = 0;
    }
    adif->original_copy  = faad_get1bit(ld
        DEBUGVAR(1,112,"get_adif_header(): original_copy"));
    adif->home = faad_get1bit(ld
        DEBUGVAR(1,113,"get_adif_header(): home"));
    adif->bitstream_type = faad_get1bit(ld
        DEBUGVAR(1,114,"get_adif_header(): bitstream_type"));
    adif->bitrate = faad_getbits(ld, 23
        DEBUGVAR(1,115,"get_adif_header(): bitrate"));
    adif->num_program_config_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,116,"get_adif_header(): num_program_config_elements"));

    for (i = 0; i < adif->num_program_config_elements + 1; i++)
    {
        if(adif->bitstream_type == 0)
        {
            adif->adif_buffer_fullness = faad_getbits(ld, 20
                DEBUGVAR(1,117,"get_adif_header(): adif_buffer_fullness"));
        } else {
            adif->adif_buffer_fullness = 0;
        }

        program_config_element(&adif->pce[i], ld);
    }
}

Project: faad2
File: syntax.c

static uint8_t ics_info(NeAACDecStruct *hDecoder, ic_stream *ics, bitfile *ld,
                        uint8_t common_window)
{
    uint8_t retval = 0;
    uint8_t ics_reserved_bit;

    ics_reserved_bit = faad_get1bit(ld
        DEBUGVAR(1,43,"ics_info(): ics_reserved_bit"));
    if (ics_reserved_bit != 0)
        return 32;
    ics->window_sequence = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,44,"ics_info(): window_sequence"));
    ics->window_shape = faad_get1bit(ld
        DEBUGVAR(1,45,"ics_info(): window_shape"));

#ifdef LD_DEC
    /* No block switching in LD */
    if ((hDecoder->object_type == LD) && (ics->window_sequence != ONLY_LONG_SEQUENCE))
        return 32;
#endif

    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
    {
        ics->max_sfb = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,46,"ics_info(): max_sfb (short)"));
        ics->scale_factor_grouping = (uint8_t)faad_getbits(ld, 7
            DEBUGVAR(1,47,"ics_info(): scale_factor_grouping"));
    } else {
        ics->max_sfb = (uint8_t)faad_getbits(ld, 6
            DEBUGVAR(1,48,"ics_info(): max_sfb (long)"));
    }

    /* get the grouping information */
    if ((retval = window_grouping_info(hDecoder, ics)) > 0)
        return retval;


    /* should be an error */
    /* check the range of max_sfb */
    if (ics->max_sfb > ics->num_swb)
        return 16;

    if (ics->window_sequence != EIGHT_SHORT_SEQUENCE)
    {
        if ((ics->predictor_data_present = faad_get1bit(ld
            DEBUGVAR(1,49,"ics_info(): predictor_data_present"))) & 1)
        {
            if (hDecoder->object_type == MAIN) /* MPEG2 style AAC predictor */
            {
                uint8_t sfb;

                uint8_t limit = min(ics->max_sfb, max_pred_sfb(hDecoder->sf_index));
#ifdef MAIN_DEC
                ics->pred.limit = limit;
#endif

                if ((
#ifdef MAIN_DEC
                    ics->pred.predictor_reset =
#endif
                    faad_get1bit(ld DEBUGVAR(1,53,"ics_info(): pred.predictor_reset"))) & 1)
                {
#ifdef MAIN_DEC
                    ics->pred.predictor_reset_group_number =
#endif
                        (uint8_t)faad_getbits(ld, 5 DEBUGVAR(1,54,"ics_info(): pred.predictor_reset_group_number"));
                }

                for (sfb = 0; sfb < limit; sfb++)
                {
#ifdef MAIN_DEC
                    ics->pred.prediction_used[sfb] =
#endif
                        faad_get1bit(ld DEBUGVAR(1,55,"ics_info(): pred.prediction_used"));
                }
            }
#ifdef LTP_DEC
            else { /* Long Term Prediction */
                if (hDecoder->object_type < ER_OBJECT_START)
                {
                    if ((ics->ltp.data_present = faad_get1bit(ld
                        DEBUGVAR(1,50,"ics_info(): ltp.data_present"))) & 1)
                    {
                        if ((retval = ltp_data(hDecoder, ics, &(ics->ltp), ld)) > 0)
                        {
                            return retval;
                        }
                    }
                    if (common_window)
                    {
                        if ((ics->ltp2.data_present = faad_get1bit(ld
                            DEBUGVAR(1,51,"ics_info(): ltp2.data_present"))) & 1)
                        {
                            if ((retval = ltp_data(hDecoder, ics, &(ics->ltp2), ld)) > 0)
                            {
                                return retval;
                            }
                        }
                    }
                }
#ifdef ERROR_RESILIENCE
                if (!common_window && (hDecoder->object_type >= ER_OBJECT_START))
                {
                    if ((ics->ltp.data_present = faad_get1bit(ld
                        DEBUGVAR(1,50,"ics_info(): ltp.data_present"))) & 1)
                    {
                        ltp_data(hDecoder, ics, &(ics->ltp), ld);
                    }
                }
#endif
            }
#endif
        }
    }

    return retval;
}

Project: faad2
File: syntax.c

static uint8_t individual_channel_stream(NeAACDecStruct *hDecoder, element *ele,
                                         bitfile *ld, ic_stream *ics, uint8_t scal_flag,
                                         int16_t *spec_data)
{
    uint8_t result;

    result = side_info(hDecoder, ele, ld, ics, scal_flag);
    if (result > 0)
        return result;

    if (hDecoder->object_type >= ER_OBJECT_START) 
    {
        if (ics->tns_data_present)
            tns_data(ics, &(ics->tns), ld);
    }

#ifdef DRM
    /* CRC check */
    if (hDecoder->object_type == DRM_ER_LC)
    {
        if ((result = (uint8_t)faad_check_CRC(ld, (uint16_t)faad_get_processed_bits(ld) - 8)) > 0)
            return result;
    }
#endif

#ifdef ERROR_RESILIENCE
    if (hDecoder->aacSpectralDataResilienceFlag)
    {
        /* error resilient spectral data decoding */
        if ((result = reordered_spectral_data(hDecoder, ics, ld, spec_data)) > 0)
        {
            return result;
        }
    } else {
#endif
        /* decode the spectral data */
        if ((result = spectral_data(hDecoder, ics, ld, spec_data)) > 0)
        {
            return result;
        }
#ifdef ERROR_RESILIENCE
    }
#endif

    /* pulse coding reconstruction */
    if (ics->pulse_data_present)
    {
        if (ics->window_sequence != EIGHT_SHORT_SEQUENCE)
        {
            if ((result = pulse_decode(ics, spec_data, hDecoder->frameLength)) > 0)
                return result;
        } else {
            return 2; /* pulse coding not allowed for short blocks */
        }
    }

    return 0;
}

Project: faad2

static uint32_t latmAudioMuxElement(latm_header *latm, bitfile *ld)
{
    uint32_t ascLen, asc_bits=0;
    uint32_t x1, y1, m, n, i;
    program_config pce;
    mp4AudioSpecificConfig mp4ASC;

    latm->useSameStreamMux = (uint8_t)faad_getbits(ld, 1);
    if(!latm->useSameStreamMux)
    {
        latm->version = (uint8_t) faad_getbits(ld, 1);
        if(latm->version)
            latm->versionA = (uint8_t) faad_getbits(ld, 1);
        if(latm->versionA)
        {
            fprintf(stderr, "versionA not supported\n");
            return 0;
        }
        if(latm->version) //read taraBufferFullness
            latm_get_value(ld);
        latm->allStreamsSameTimeFraming = (uint8_t)faad_getbits(ld, 1);
        latm->numSubFrames = (uint8_t)faad_getbits(ld, 6) + 1;
        latm->numPrograms = (uint8_t)faad_getbits(ld, 4) + 1;
        latm->numLayers = faad_getbits(ld, 3) + 1;
        if(latm->numPrograms>1 || !latm->allStreamsSameTimeFraming || latm->numSubFrames>1 || latm->numLayers>1)
        {
            fprintf(stderr, "\r\nUnsupported LATM configuration: %d programs/ %d subframes, %d layers, allstreams: %d\n",
                latm->numPrograms, latm->numSubFrames, latm->numLayers, latm->allStreamsSameTimeFraming);
            return 0;
        }
        ascLen = 0;
        if(latm->version)
            ascLen = latm_get_value(ld);

        x1 = faad_get_processed_bits(ld);
        if(AudioSpecificConfigFromBitfile(ld, &mp4ASC, &pce, 0, 1) < 0)
            return 0;

        y1 = faad_get_processed_bits(ld);
        if((y1-x1) <= MAX_ASC_BYTES*8)
        {
            faad_rewindbits(ld);
            m = x1;
            while(m>0)
            {
                n = min(m, 32);
                faad_getbits(ld, n);
                m -= n;
            }

            i = 0;
            m = latm->ASCbits = y1 - x1;
            while(m > 0)
            {
                n = min(m, 8);
                latm->ASC[i++] = (uint8_t) faad_getbits(ld, n);
                m -= n;
            }
        }

        asc_bits = y1-x1;

        if(ascLen>asc_bits)
            faad_getbits(ld, ascLen-asc_bits);

        latm->framelen_type = (uint8_t) faad_getbits(ld, 3);
        if(latm->framelen_type == 0)
        {
            latm->frameLength = 0;
            faad_getbits(ld, 8); //buffer fullness for frame_len_type==0, useless
        }
        else if(latm->framelen_type == 1)
        {
            latm->frameLength = faad_getbits(ld, 9);
            if(latm->frameLength==0)
            {
                fprintf(stderr, "Invalid frameLength: 0\r\n");
                return 0;
            }
            latm->frameLength = (latm->frameLength+20)*8;
        }
        else
        {   //hellish CELP or HCVX stuff, discard
            fprintf(stderr, "Unsupported CELP/HCVX framelentype: %d\n", latm->framelen_type);
            return 0;
        }

        latm->otherDataLenBits = 0;
        if(faad_getbits(ld, 1))
        {   //other data present
            int esc, tmp;
            if(latm->version)
                latm->otherDataLenBits = latm_get_value(ld);
            else do
            {
                esc = faad_getbits(ld, 1);
                tmp = faad_getbits(ld, 8);
                latm->otherDataLenBits = (latm->otherDataLenBits << 8) + tmp;
            } while(esc);
        }
        if(faad_getbits(ld, 1)) //crc
            faad_getbits(ld, 8);
        latm->inited = 1;
      }

      if(latm->inited)
          return latmParsePayload(latm, ld);
      else
          return 0;
}

Project: faad2

static uint32_t latmParsePayload(latm_header *latm, bitfile *ld)
{
    uint32_t framelen;
    uint8_t tmp;

    framelen = 0;
    if(latm->framelen_type==0)
    {
        do
        {
            tmp = (uint8_t)faad_getbits(ld, 8);
            framelen += tmp;
        } while(tmp==0xff);
    }
    else if(latm->framelen_type==1)
        framelen=latm->frameLength;

    return framelen;
}

Project: faad2
File: syntax.c

static uint32_t latm_get_value(bitfile *ld)
{
    uint32_t l, value;
    uint8_t bytesForValue;

    bytesForValue = (uint8_t)faad_getbits(ld, 2);
    value = 0;
    for(l=0; l<bytesForValue; l++)
        value = (value << 8) | (uint8_t)faad_getbits(ld, 8);

    return value;
}

Project: faad2
File: syntax.c

static uint8_t ltp_data(NeAACDecStruct *hDecoder, ic_stream *ics, ltp_info *ltp, bitfile *ld)
{
    uint8_t sfb, w;

    ltp->lag = 0;

#ifdef LD_DEC
    if (hDecoder->object_type == LD)
    {
        ltp->lag_update = (uint8_t)faad_getbits(ld, 1
            DEBUGVAR(1,142,"ltp_data(): lag_update"));

        if (ltp->lag_update)
        {
            ltp->lag = (uint16_t)faad_getbits(ld, 10
                DEBUGVAR(1,81,"ltp_data(): lag"));
        }
    } else {
#endif
        ltp->lag = (uint16_t)faad_getbits(ld, 11
            DEBUGVAR(1,81,"ltp_data(): lag"));
#ifdef LD_DEC
    }
#endif

    /* Check length of lag */
    if (ltp->lag > (hDecoder->frameLength << 1))
        return 18;

    ltp->coef = (uint8_t)faad_getbits(ld, 3
        DEBUGVAR(1,82,"ltp_data(): coef"));

    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
    {
        for (w = 0; w < ics->num_windows; w++)
        {
            if ((ltp->short_used[w] = faad_get1bit(ld
                DEBUGVAR(1,83,"ltp_data(): short_used"))) & 1)
            {
                ltp->short_lag_present[w] = faad_get1bit(ld
                    DEBUGVAR(1,84,"ltp_data(): short_lag_present"));
                if (ltp->short_lag_present[w])
                {
                    ltp->short_lag[w] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,85,"ltp_data(): short_lag"));
                }
            }
        }
    } else {
        ltp->last_band = (ics->max_sfb < MAX_LTP_SFB ? ics->max_sfb : MAX_LTP_SFB);

        for (sfb = 0; sfb < ltp->last_band; sfb++)
        {
            ltp->long_used[sfb] = faad_get1bit(ld
                DEBUGVAR(1,86,"ltp_data(): long_used"));
        }
    }

    return 0;
}

Project: faad2
File: syntax.c

static uint8_t program_config_element(program_config *pce, bitfile *ld)
{
    uint8_t i;

    memset(pce, 0, sizeof(program_config));

    pce->channels = 0;

    pce->element_instance_tag = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,10,"program_config_element(): element_instance_tag"));

    pce->object_type = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,11,"program_config_element(): object_type"));
    pce->sf_index = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,12,"program_config_element(): sf_index"));
    pce->num_front_channel_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,13,"program_config_element(): num_front_channel_elements"));
    pce->num_side_channel_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,14,"program_config_element(): num_side_channel_elements"));
    pce->num_back_channel_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,15,"program_config_element(): num_back_channel_elements"));
    pce->num_lfe_channel_elements = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,16,"program_config_element(): num_lfe_channel_elements"));
    pce->num_assoc_data_elements = (uint8_t)faad_getbits(ld, 3
        DEBUGVAR(1,17,"program_config_element(): num_assoc_data_elements"));
    pce->num_valid_cc_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,18,"program_config_element(): num_valid_cc_elements"));

    pce->mono_mixdown_present = faad_get1bit(ld
        DEBUGVAR(1,19,"program_config_element(): mono_mixdown_present"));
    if (pce->mono_mixdown_present == 1)
    {
        pce->mono_mixdown_element_number = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,20,"program_config_element(): mono_mixdown_element_number"));
    }

    pce->stereo_mixdown_present = faad_get1bit(ld
        DEBUGVAR(1,21,"program_config_element(): stereo_mixdown_present"));
    if (pce->stereo_mixdown_present == 1)
    {
        pce->stereo_mixdown_element_number = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,22,"program_config_element(): stereo_mixdown_element_number"));
    }

    pce->matrix_mixdown_idx_present = faad_get1bit(ld
        DEBUGVAR(1,23,"program_config_element(): matrix_mixdown_idx_present"));
    if (pce->matrix_mixdown_idx_present == 1)
    {
        pce->matrix_mixdown_idx = (uint8_t)faad_getbits(ld, 2
            DEBUGVAR(1,24,"program_config_element(): matrix_mixdown_idx"));
        pce->pseudo_surround_enable = faad_get1bit(ld
            DEBUGVAR(1,25,"program_config_element(): pseudo_surround_enable"));
    }

    for (i = 0; i < pce->num_front_channel_elements; i++)
    {
        pce->front_element_is_cpe[i] = faad_get1bit(ld
            DEBUGVAR(1,26,"program_config_element(): front_element_is_cpe"));
        pce->front_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,27,"program_config_element(): front_element_tag_select"));

        if (pce->front_element_is_cpe[i] & 1)
        {
            pce->cpe_channel[pce->front_element_tag_select[i]] = pce->channels;
            pce->num_front_channels += 2;
            pce->channels += 2;
        } else {
            pce->sce_channel[pce->front_element_tag_select[i]] = pce->channels;
            pce->num_front_channels++;
            pce->channels++;
        }
    }

    for (i = 0; i < pce->num_side_channel_elements; i++)
    {
        pce->side_element_is_cpe[i] = faad_get1bit(ld
            DEBUGVAR(1,28,"program_config_element(): side_element_is_cpe"));
        pce->side_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,29,"program_config_element(): side_element_tag_select"));

        if (pce->side_element_is_cpe[i] & 1)
        {
            pce->cpe_channel[pce->side_element_tag_select[i]] = pce->channels;
            pce->num_side_channels += 2;
            pce->channels += 2;
        } else {
            pce->sce_channel[pce->side_element_tag_select[i]] = pce->channels;
            pce->num_side_channels++;
            pce->channels++;
        }
    }

    for (i = 0; i < pce->num_back_channel_elements; i++)
    {
        pce->back_element_is_cpe[i] = faad_get1bit(ld
            DEBUGVAR(1,30,"program_config_element(): back_element_is_cpe"));
        pce->back_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,31,"program_config_element(): back_element_tag_select"));

        if (pce->back_element_is_cpe[i] & 1)
        {
            pce->cpe_channel[pce->back_element_tag_select[i]] = pce->channels;
            pce->channels += 2;
            pce->num_back_channels += 2;
        } else {
            pce->sce_channel[pce->back_element_tag_select[i]] = pce->channels;
            pce->num_back_channels++;
            pce->channels++;
        }
    }

    for (i = 0; i < pce->num_lfe_channel_elements; i++)
    {
        pce->lfe_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,32,"program_config_element(): lfe_element_tag_select"));

        pce->sce_channel[pce->lfe_element_tag_select[i]] = pce->channels;
        pce->num_lfe_channels++;
        pce->channels++;
    }

    for (i = 0; i < pce->num_assoc_data_elements; i++)
        pce->assoc_data_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,33,"program_config_element(): assoc_data_element_tag_select"));

    for (i = 0; i < pce->num_valid_cc_elements; i++)
    {
        pce->cc_element_is_ind_sw[i] = faad_get1bit(ld
            DEBUGVAR(1,34,"program_config_element(): cc_element_is_ind_sw"));
        pce->valid_cc_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,35,"program_config_element(): valid_cc_element_tag_select"));
    }

    faad_byte_align(ld);

    pce->comment_field_bytes = (uint8_t)faad_getbits(ld, 8
        DEBUGVAR(1,36,"program_config_element(): comment_field_bytes"));

    for (i = 0; i < pce->comment_field_bytes; i++)
    {
        pce->comment_field_data[i] = (uint8_t)faad_getbits(ld, 8
            DEBUGVAR(1,37,"program_config_element(): comment_field_data"));
    }
    pce->comment_field_data[i] = 0;

    if (pce->channels > MAX_CHANNELS)
        return 22;

    return 0;
}

Project: faad2
File: syntax.c

static uint8_t pulse_data(ic_stream *ics, pulse_info *pul, bitfile *ld)
{
    uint8_t i;

    pul->number_pulse = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,56,"pulse_data(): number_pulse"));
    pul->pulse_start_sfb = (uint8_t)faad_getbits(ld, 6
        DEBUGVAR(1,57,"pulse_data(): pulse_start_sfb"));

    /* check the range of pulse_start_sfb */
    if (pul->pulse_start_sfb > ics->num_swb)
        return 16;

    for (i = 0; i < pul->number_pulse+1; i++)
    {
        pul->pulse_offset[i] = (uint8_t)faad_getbits(ld, 5
            DEBUGVAR(1,58,"pulse_data(): pulse_offset"));
#if 0
        printf("%d\n", pul->pulse_offset[i]);
#endif
        pul->pulse_amp[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,59,"pulse_data(): pulse_amp"));
#if 0
        printf("%d\n", pul->pulse_amp[i]);
#endif
    }

    return 0;
}

Project: faad2

void raw_data_block(NeAACDecStruct *hDecoder, NeAACDecFrameInfo *hInfo,
                    bitfile *ld, program_config *pce, drc_info *drc)
{
    uint8_t id_syn_ele;
    uint8_t ele_this_frame = 0;

    hDecoder->fr_channels = 0;
    hDecoder->fr_ch_ele = 0;
    hDecoder->first_syn_ele = 25;
    hDecoder->has_lfe = 0;

#ifdef ERROR_RESILIENCE
    if (hDecoder->object_type < ER_OBJECT_START)
    {
#endif
        /* Table 4.4.3: raw_data_block() */
        while ((id_syn_ele = (uint8_t)faad_getbits(ld, LEN_SE_ID
            DEBUGVAR(1,4,"NeAACDecDecode(): id_syn_ele"))) != ID_END)
        {
            switch (id_syn_ele) {
            case ID_SCE:
                ele_this_frame++;
                if (hDecoder->first_syn_ele == 25) hDecoder->first_syn_ele = id_syn_ele;
                decode_sce_lfe(hDecoder, hInfo, ld, id_syn_ele);
                if (hInfo->error > 0)
                    return;
                break;
            case ID_CPE:
                ele_this_frame++;
                if (hDecoder->first_syn_ele == 25) hDecoder->first_syn_ele = id_syn_ele;
                decode_cpe(hDecoder, hInfo, ld, id_syn_ele);
                if (hInfo->error > 0)
                    return;
                break;
            case ID_LFE:
#ifdef DRM
                hInfo->error = 32;
#else
                ele_this_frame++;
                hDecoder->has_lfe++;
                decode_sce_lfe(hDecoder, hInfo, ld, id_syn_ele);
#endif
                if (hInfo->error > 0)
                    return;
                break;
            case ID_CCE: /* not implemented yet, but skip the bits */
#ifdef DRM
                hInfo->error = 32;
#else
                ele_this_frame++;
#ifdef COUPLING_DEC
                hInfo->error = coupling_channel_element(hDecoder, ld);
#else
                hInfo->error = 6;
#endif
#endif
                if (hInfo->error > 0)
                    return;
                break;
            case ID_DSE:
                ele_this_frame++;
                data_stream_element(hDecoder, ld);
                break;
            case ID_PCE:
                if (ele_this_frame != 0)
                {
                    hInfo->error = 31;
                    return;
                }
                ele_this_frame++;
                /* 14496-4: 5.6.4.1.2.1.3: */
                /* program_configuration_element()'s in access units shall be ignored */
                program_config_element(pce, ld);
                break;
            case ID_FIL:
                ele_this_frame++;
                /* one sbr_info describes a channel_element not a channel! */
                /* if we encounter SBR data here: error */
                /* SBR data will be read directly in the SCE/LFE/CPE element */
                if ((hInfo->error = fill_element(hDecoder, ld, drc
#ifdef SBR_DEC
                    , INVALID_SBR_ELEMENT
#endif
                    )) > 0)
                    return;
                break;
            }
        }
#ifdef ERROR_RESILIENCE
    } else {
        /* Table 262: er_raw_data_block() */
        switch (hDecoder->channelConfiguration)
        {
        case 1:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            if (hInfo->error > 0)
                return;
            break;
        case 2:
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            if (hInfo->error > 0)
                return;
            break;
        case 3:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            if (hInfo->error > 0)
                return;
            break;
        case 4:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            if (hInfo->error > 0)
                return;
            break;
        case 5:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            if (hInfo->error > 0)
                return;
            break;
        case 6:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_sce_lfe(hDecoder, hInfo, ld, ID_LFE);
            if (hInfo->error > 0)
                return;
            break;
        case 7: /* 8 channels */
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_sce_lfe(hDecoder, hInfo, ld, ID_LFE);
            if (hInfo->error > 0)
                return;
            break;
        default:
            hInfo->error = 7;
            return;
        }
#if 0
        cnt = bits_to_decode() / 8;
        while (cnt >= 1)
        {
            cnt -= extension_payload(cnt);
        }
#endif
    }
#endif

    /* new in corrigendum 14496-3:2002 */
#ifdef DRM
    if (hDecoder->object_type != DRM_ER_LC
#if 0
        && !hDecoder->latm_header_present
#endif
        )
#endif
    {
        faad_byte_align(ld);
    }

    return;
}

Project: faad2
File: syntax.c

static uint8_t scale_factor_data(NeAACDecStruct *hDecoder, ic_stream *ics, bitfile *ld)
{
    uint8_t ret = 0;
#ifdef PROFILE
    int64_t count = faad_get_ts();
#endif

#ifdef ERROR_RESILIENCE
    if (!hDecoder->aacScalefactorDataResilienceFlag)
    {
#endif
        ret = decode_scale_factors(ics, ld);
#ifdef ERROR_RESILIENCE
    } else {
        /* In ER AAC the parameters for RVLC are seperated from the actual
           data that holds the scale_factors.
           Strangely enough, 2 parameters for HCR are put inbetween them.
        */
        ret = rvlc_scale_factor_data(ics, ld);
    }
#endif

#ifdef PROFILE
    count = faad_get_ts() - count;
    hDecoder->scalefac_cycles += count;
#endif

    return ret;
}

Project: faad2
File: syntax.c

static uint8_t section_data(NeAACDecStruct *hDecoder, ic_stream *ics, bitfile *ld)
{
    uint8_t g;
    uint8_t sect_esc_val, sect_bits;

    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
        sect_bits = 3;
    else
        sect_bits = 5;
    sect_esc_val = (1<<sect_bits) - 1;

#if 0
    printf("\ntotal sfb %d\n", ics->max_sfb);
    printf("   sect    top     cb\n");
#endif

    for (g = 0; g < ics->num_window_groups; g++)
    {
        uint8_t k = 0;
        uint8_t i = 0;

        while (k < ics->max_sfb)
        {
#ifdef ERROR_RESILIENCE
            uint8_t vcb11 = 0;
#endif
            uint8_t sfb;
            uint8_t sect_len_incr;
            uint16_t sect_len = 0;
            uint8_t sect_cb_bits = 4;

            /* if "faad_getbits" detects error and returns "0", "k" is never
               incremented and we cannot leave the while loop */
            if (ld->error != 0)
                return 14;

#ifdef ERROR_RESILIENCE
            if (hDecoder->aacSectionDataResilienceFlag)
                sect_cb_bits = 5;
#endif

            ics->sect_cb[g][i] = (uint8_t)faad_getbits(ld, sect_cb_bits
                DEBUGVAR(1,71,"section_data(): sect_cb"));

            if (ics->sect_cb[g][i] == 12)
                return 32;

#if 0
            printf("%d\n", ics->sect_cb[g][i]);
#endif

#ifndef DRM
            if (ics->sect_cb[g][i] == NOISE_HCB)
                ics->noise_used = 1;
#else
            /* PNS not allowed in DRM */
            if (ics->sect_cb[g][i] == NOISE_HCB)
                return 29;
#endif
            if (ics->sect_cb[g][i] == INTENSITY_HCB2 || ics->sect_cb[g][i] == INTENSITY_HCB)
                ics->is_used = 1;

#ifdef ERROR_RESILIENCE
            if (hDecoder->aacSectionDataResilienceFlag)
            {
                if ((ics->sect_cb[g][i] == 11) ||
                    ((ics->sect_cb[g][i] >= 16) && (ics->sect_cb[g][i] <= 32)))
                {
                    vcb11 = 1;
                }
            }
            if (vcb11)
            {
                sect_len_incr = 1;
            } else {
#endif
                sect_len_incr = (uint8_t)faad_getbits(ld, sect_bits
                    DEBUGVAR(1,72,"section_data(): sect_len_incr"));
#ifdef ERROR_RESILIENCE
            }
#endif
            while ((sect_len_incr == sect_esc_val) /* &&
                (k+sect_len < ics->max_sfb)*/)
            {
                sect_len += sect_len_incr;
                sect_len_incr = (uint8_t)faad_getbits(ld, sect_bits
                    DEBUGVAR(1,72,"section_data(): sect_len_incr"));
            }

            sect_len += sect_len_incr;

            ics->sect_start[g][i] = k;
            ics->sect_end[g][i] = k + sect_len;

#if 0
            printf("%d\n", ics->sect_start[g][i]);
#endif
#if 0
            printf("%d\n", ics->sect_end[g][i]);
#endif

            if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
            {
                if (k + sect_len > 8*15)
                    return 15;
                if (i >= 8*15)
                    return 15;
            } else {
                if (k + sect_len > MAX_SFB)
                    return 15;
                if (i >= MAX_SFB)
                    return 15;
            }

            for (sfb = k; sfb < k + sect_len; sfb++)
            {
                ics->sfb_cb[g][sfb] = ics->sect_cb[g][i];
#if 0
                printf("%d\n", ics->sfb_cb[g][sfb]);
#endif
            }

#if 0
            printf(" %6d %6d %6d\n",
                i,
                ics->sect_end[g][i],
                ics->sect_cb[g][i]);
#endif

            k += sect_len;
            i++;
        }
        ics->num_sec[g] = i;

        /* the sum of all sect_len_incr elements for a given window
         * group shall equal max_sfb */
        if (k != ics->max_sfb)
        {
            return 32;
        }
#if 0
        printf("%d\n", ics->num_sec[g]);
#endif
    }

#if 0
    printf("\n");
#endif

    return 0;
}

Project: faad2
File: syntax.c

static uint8_t side_info(NeAACDecStruct *hDecoder, element *ele,
                         bitfile *ld, ic_stream *ics, uint8_t scal_flag)
{
    uint8_t result;

    ics->global_gain = (uint8_t)faad_getbits(ld, 8
        DEBUGVAR(1,67,"individual_channel_stream(): global_gain"));

    if (!ele->common_window && !scal_flag)
    {
        if ((result = ics_info(hDecoder, ics, ld, ele->common_window)) > 0)
            return result;
    }

    if ((result = section_data(hDecoder, ics, ld)) > 0)
        return result;

    if ((result = scale_factor_data(hDecoder, ics, ld)) > 0)
        return result;

    if (!scal_flag)
    {
        /**
         **  NOTE: It could be that pulse data is available in scalable AAC too,
         **        as said in Amendment 1, this could be only the case for ER AAC,
         **        though. (have to check this out later)
         **/
        /* get pulse data */
        if ((ics->pulse_data_present = faad_get1bit(ld
            DEBUGVAR(1,68,"individual_channel_stream(): pulse_data_present"))) & 1)
        {
            if ((result = pulse_data(ics, &(ics->pul), ld)) > 0)
                return result;
        }

        /* get tns data */
        if ((ics->tns_data_present = faad_get1bit(ld
            DEBUGVAR(1,69,"individual_channel_stream(): tns_data_present"))) & 1)
        {
#ifdef ERROR_RESILIENCE
            if (hDecoder->object_type < ER_OBJECT_START)
#endif
                tns_data(ics, &(ics->tns), ld);
        }

        /* get gain control data */
        if ((ics->gain_control_data_present = faad_get1bit(ld
            DEBUGVAR(1,70,"individual_channel_stream(): gain_control_data_present"))) & 1)
        {
#ifdef SSR_DEC
            if (hDecoder->object_type != SSR)
                return 1;
            else
                gain_control_data(ld, ics);
#else
            return 1;
#endif
        }
    }

#ifdef ERROR_RESILIENCE
    if (hDecoder->aacSpectralDataResilienceFlag)
    {
        ics->length_of_reordered_spectral_data = (uint16_t)faad_getbits(ld, 14
            DEBUGVAR(1,147,"individual_channel_stream(): length_of_reordered_spectral_data"));

        if (hDecoder->channelConfiguration == 2)
        {
            if (ics->length_of_reordered_spectral_data > 6144)
                ics->length_of_reordered_spectral_data = 6144;
        } else {
            if (ics->length_of_reordered_spectral_data > 12288)
                ics->length_of_reordered_spectral_data = 12288;
        }

        ics->length_of_longest_codeword = (uint8_t)faad_getbits(ld, 6
            DEBUGVAR(1,148,"individual_channel_stream(): length_of_longest_codeword"));
        if (ics->length_of_longest_codeword >= 49)
            ics->length_of_longest_codeword = 49;
    }

    /* RVLC spectral data is put here */
    if (hDecoder->aacScalefactorDataResilienceFlag)
    {
        if ((result = rvlc_decode_scale_factors(ics, ld)) > 0)
            return result;
    }
#endif

    return 0;
}

Project: faad2
File: syntax.c

static uint8_t single_lfe_channel_element(NeAACDecStruct *hDecoder, bitfile *ld,
                                          uint8_t channel, uint8_t *tag)
{
    uint8_t retval = 0;
    element sce = {0};
    ic_stream *ics = &(sce.ics1);
    ALIGN int16_t spec_data[1024] = {0};

    sce.element_instance_tag = (uint8_t)faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,38,"single_lfe_channel_element(): element_instance_tag"));

    *tag = sce.element_instance_tag;
    sce.channel = channel;
    sce.paired_channel = -1;

    retval = individual_channel_stream(hDecoder, &sce, ld, ics, 0, spec_data);
    if (retval > 0)
        return retval;

    /* IS not allowed in single channel */
    if (ics->is_used)
        return 32;

#ifdef SBR_DEC
    /* check if next bitstream element is a fill element */
    /* if so, read it now so SBR decoding can be done in case of a file with SBR */
    if (faad_showbits(ld, LEN_SE_ID) == ID_FIL)
    {
        faad_flushbits(ld, LEN_SE_ID);

        /* one sbr_info describes a channel_element not a channel! */
        if ((retval = fill_element(hDecoder, ld, hDecoder->drc, hDecoder->fr_ch_ele)) > 0)
        {
            return retval;
        }
    }
#endif

    /* noiseless coding is done, spectral reconstruction is done now */
    retval = reconstruct_single_channel(hDecoder, ics, &sce, spec_data);
    if (retval > 0)
        return retval;

    return 0;
}

Project: faad2

static uint8_t spectral_data(NeAACDecStruct *hDecoder, ic_stream *ics, bitfile *ld,
                             int16_t *spectral_data)
{
    int8_t i;
    uint8_t g;
    uint16_t inc, k, p = 0;
    uint8_t groups = 0;
    uint8_t sect_cb;
    uint8_t result;
    uint16_t nshort = hDecoder->frameLength/8;

#ifdef PROFILE
    int64_t count = faad_get_ts();
#endif

    for(g = 0; g < ics->num_window_groups; g++)
    {
        p = groups*nshort;

        for (i = 0; i < ics->num_sec[g]; i++)
        {
            sect_cb = ics->sect_cb[g][i];

            inc = (sect_cb >= FIRST_PAIR_HCB) ? 2 : 4;

            switch (sect_cb)
            {
            case ZERO_HCB:
            case NOISE_HCB:
            case INTENSITY_HCB:
            case INTENSITY_HCB2:
#ifdef SD_PRINT
                {
                    int j;
                    for (j = ics->sect_sfb_offset[g][ics->sect_start[g][i]]; j < ics->sect_sfb_offset[g][ics->sect_end[g][i]]; j++)
                    {
                        printf("%d\n", 0);
                    }
                }
#endif
#ifdef SFBO_PRINT
                printf("%d\n", ics->sect_sfb_offset[g][ics->sect_start[g][i]]);
#endif
                p += (ics->sect_sfb_offset[g][ics->sect_end[g][i]] -
                    ics->sect_sfb_offset[g][ics->sect_start[g][i]]);
                break;
            default:
#ifdef SFBO_PRINT
                printf("%d\n", ics->sect_sfb_offset[g][ics->sect_start[g][i]]);
#endif
                for (k = ics->sect_sfb_offset[g][ics->sect_start[g][i]];
                     k < ics->sect_sfb_offset[g][ics->sect_end[g][i]]; k += inc)
                {
                    if ((result = huffman_spectral_data(sect_cb, ld, &spectral_data[p])) > 0)
                        return result;
#ifdef SD_PRINT
                    {
                        int j;
                        for (j = p; j < p+inc; j++)
                        {
                            printf("%d\n", spectral_data[j]);
                        }
                    }
#endif
                    p += inc;
                }
                break;
            }
        }
        groups += ics->window_group_length[g];
    }

#ifdef PROFILE
    count = faad_get_ts() - count;
    hDecoder->spectral_cycles += count;
#endif

    return 0;
}

Project: faad2
File: syntax.c

static void tns_data(ic_stream *ics, tns_info *tns, bitfile *ld)
{
    uint8_t w, filt, i, start_coef_bits, coef_bits;
    uint8_t n_filt_bits = 2;
    uint8_t length_bits = 6;
    uint8_t order_bits = 5;

    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
    {
        n_filt_bits = 1;
        length_bits = 4;
        order_bits = 3;
    }

    for (w = 0; w < ics->num_windows; w++)
    {
        tns->n_filt[w] = (uint8_t)faad_getbits(ld, n_filt_bits
            DEBUGVAR(1,74,"tns_data(): n_filt"));
#if 0
        printf("%d\n", tns->n_filt[w]);
#endif

        if (tns->n_filt[w])
        {
            if ((tns->coef_res[w] = faad_get1bit(ld
                DEBUGVAR(1,75,"tns_data(): coef_res"))) & 1)
            {
                start_coef_bits = 4;
            } else {
                start_coef_bits = 3;
            }
#if 0
            printf("%d\n", tns->coef_res[w]);
#endif
        }

        for (filt = 0; filt < tns->n_filt[w]; filt++)
        {
            tns->length[w][filt] = (uint8_t)faad_getbits(ld, length_bits
                DEBUGVAR(1,76,"tns_data(): length"));
#if 0
            printf("%d\n", tns->length[w][filt]);
#endif
            tns->order[w][filt]  = (uint8_t)faad_getbits(ld, order_bits
                DEBUGVAR(1,77,"tns_data(): order"));
#if 0
            printf("%d\n", tns->order[w][filt]);
#endif
            if (tns->order[w][filt])
            {
                tns->direction[w][filt] = faad_get1bit(ld
                    DEBUGVAR(1,78,"tns_data(): direction"));
#if 0
                printf("%d\n", tns->direction[w][filt]);
#endif
                tns->coef_compress[w][filt] = faad_get1bit(ld
                    DEBUGVAR(1,79,"tns_data(): coef_compress"));
#if 0
                printf("%d\n", tns->coef_compress[w][filt]);
#endif

                coef_bits = start_coef_bits - tns->coef_compress[w][filt];
                for (i = 0; i < tns->order[w][filt]; i++)
                {
                    tns->coef[w][filt][i] = (uint8_t)faad_getbits(ld, coef_bits
                        DEBUGVAR(1,80,"tns_data(): coef"));
#if 0
                    printf("%d\n", tns->coef[w][filt][i]);
#endif
                }
            }
        }
    }
}