float bps1, high_freq, bps;
float bps1, high_freq; volatile float bps;
static int wma_decode_init(AVCodecContext * avctx){    WMADecodeContext *s = avctx->priv_data;    int i, flags1, flags2;    float *window;    uint8_t *extradata;    float bps1, high_freq, bps;    int sample_rate1;    int coef_vlc_table;        s->sample_rate = avctx->sample_rate;    s->nb_channels = avctx->channels;    s->bit_rate = avctx->bit_rate;    s->block_align = avctx->block_align;    if (avctx->codec->id == CODEC_ID_WMAV1) {        s->version = 1;    } else {        s->version = 2;    }        /* extract flag infos */    flags1 = 0;    flags2 = 0;    extradata = avctx->extradata;    if (s->version == 1 && avctx->extradata_size >= 4) {        flags1 = extradata[0] | (extradata[1] << 8);        flags2 = extradata[2] | (extradata[3] << 8);    } else if (s->version == 2 && avctx->extradata_size >= 6) {        flags1 = extradata[0] | (extradata[1] << 8) |             (extradata[2] << 16) | (extradata[3] << 24);        flags2 = extradata[4] | (extradata[5] << 8);    }    s->use_exp_vlc = flags2 & 0x0001;    s->use_bit_reservoir = flags2 & 0x0002;    s->use_variable_block_len = flags2 & 0x0004;    /* compute MDCT block size */    if (s->sample_rate <= 16000) {        s->frame_len_bits = 9;    } else if (s->sample_rate <= 22050 ||                (s->sample_rate <= 32000 && s->version == 1)) {        s->frame_len_bits = 10;    } else {        s->frame_len_bits = 11;    }    s->frame_len = 1 << s->frame_len_bits;    if (s->use_variable_block_len) {        int nb_max, nb;        nb = ((flags2 >> 3) & 3) + 1;        if ((s->bit_rate / s->nb_channels) >= 32000)            nb += 2;        nb_max = s->frame_len_bits - BLOCK_MIN_BITS;        if (nb > nb_max)            nb = nb_max;        s->nb_block_sizes = nb + 1;    } else {        s->nb_block_sizes = 1;    }    /* init rate dependant parameters */    s->use_noise_coding = 1;    high_freq = s->sample_rate * 0.5;    /* if version 2, then the rates are normalized */    sample_rate1 = s->sample_rate;    if (s->version == 2) {        if (sample_rate1 >= 44100)             sample_rate1 = 44100;        else if (sample_rate1 >= 22050)             sample_rate1 = 22050;        else if (sample_rate1 >= 16000)             sample_rate1 = 16000;        else if (sample_rate1 >= 11025)             sample_rate1 = 11025;        else if (sample_rate1 >= 8000)             sample_rate1 = 8000;    }    bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);    s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0)) + 2;    /* compute high frequency value and choose if noise coding should       be activated */    bps1 = bps;    if (s->nb_channels == 2)        bps1 = bps * 1.6;    if (sample_rate1 == 44100) {        if (bps1 >= 0.61)            s->use_noise_coding = 0;        else            high_freq = high_freq * 0.4;    } else if (sample_rate1 == 22050) {        if (bps1 >= 1.16)            s->use_noise_coding = 0;        else if (bps1 >= 0.72)             high_freq = high_freq * 0.7;        else            high_freq = high_freq * 0.6;    } else if (sample_rate1 == 16000) {        if (bps > 0.5)            high_freq = high_freq * 0.5;        else            high_freq = high_freq * 0.3;    } else if (sample_rate1 == 11025) {        high_freq = high_freq * 0.7;    } else if (sample_rate1 == 8000) {        if (bps <= 0.625) {            high_freq = high_freq * 0.5;        } else if (bps > 0.75) {            s->use_noise_coding = 0;        } else {            high_freq = high_freq * 0.65;        }    } else {        if (bps >= 0.8) {            high_freq = high_freq * 0.75;        } else if (bps >= 0.6) {            high_freq = high_freq * 0.6;        } else {            high_freq = high_freq * 0.5;        }    }    dprintf("flags1=0x%x flags2=0x%x\n", flags1, flags2);    dprintf("version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",           s->version, s->nb_channels, s->sample_rate, s->bit_rate,            s->block_align);    dprintf("bps=%f bps1=%f high_freq=%f bitoffset=%d\n",            bps, bps1, high_freq, s->byte_offset_bits);    dprintf("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",           s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);    /* compute the scale factor band sizes for each MDCT block size */    {        int a, b, pos, lpos, k, block_len, i, j, n;        const uint8_t *table;                if (s->version == 1) {            s->coefs_start = 3;        } else {            s->coefs_start = 0;        }        for(k = 0; k < s->nb_block_sizes; k++) {            block_len = s->frame_len >> k;            if (s->version == 1) {                lpos = 0;                for(i=0;i<25;i++) {                    a = wma_critical_freqs[i];                    b = s->sample_rate;                    pos = ((block_len * 2 * a)  + (b >> 1)) / b;                    if (pos > block_len)                         pos = block_len;                    s->exponent_bands[0][i] = pos - lpos;                    if (pos >= block_len) {                        i++;                        break;                    }                    lpos = pos;                }                s->exponent_sizes[0] = i;            } else {                /* hardcoded tables */                table = NULL;                a = s->frame_len_bits - BLOCK_MIN_BITS - k;                if (a < 3) {                    if (s->sample_rate >= 44100)                        table = exponent_band_44100[a];                    else if (s->sample_rate >= 32000)                        table = exponent_band_32000[a];                    else if (s->sample_rate >= 22050)                        table = exponent_band_22050[a];                }                if (table) {                    n = *table++;                    for(i=0;i<n;i++)                        s->exponent_bands[k][i] = table[i];                    s->exponent_sizes[k] = n;                } else {                    j = 0;                    lpos = 0;                    for(i=0;i<25;i++) {                        a = wma_critical_freqs[i];                        b = s->sample_rate;                        pos = ((block_len * 2 * a)  + (b << 1)) / (4 * b);                        pos <<= 2;                        if (pos > block_len)                             pos = block_len;                        if (pos > lpos)                            s->exponent_bands[k][j++] = pos - lpos;                        if (pos >= block_len)                            break;                        lpos = pos;                    }                    s->exponent_sizes[k] = j;                }            }            /* max number of coefs */            s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;            /* high freq computation */            s->high_band_start[k] = (int)((block_len * 2 * high_freq) /                                           s->sample_rate + 0.5);            n = s->exponent_sizes[k];            j = 0;            pos = 0;            for(i=0;i<n;i++) {                int start, end;                start = pos;                pos += s->exponent_bands[k][i];                end = pos;                if (start < s->high_band_start[k])                    start = s->high_band_start[k];                if (end > s->coefs_end[k])                    end = s->coefs_end[k];                if (end > start)                    s->exponent_high_bands[k][j++] = end - start;            }            s->exponent_high_sizes[k] = j;#if 0            tprintf("%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",                  s->frame_len >> k,                   s->coefs_end[k],                  s->high_band_start[k],                  s->exponent_high_sizes[k]);            for(j=0;j<s->exponent_high_sizes[k];j++)                tprintf(" %d", s->exponent_high_bands[k][j]);            tprintf("\n");#endif        }    }#ifdef TRACE    {        int i, j;        for(i = 0; i < s->nb_block_sizes; i++) {            tprintf("%5d: n=%2d:",                    s->frame_len >> i,                    s->exponent_sizes[i]);            for(j=0;j<s->exponent_sizes[i];j++)                tprintf(" %d", s->exponent_bands[i][j]);            tprintf("\n");        }    }#endif    /* init MDCT */    for(i = 0; i < s->nb_block_sizes; i++)        ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1);        /* init MDCT windows : simple sinus window */    for(i = 0; i < s->nb_block_sizes; i++) {        int n, j;        float alpha;        n = 1 << (s->frame_len_bits - i);        window = av_malloc(sizeof(float) * n);        alpha = M_PI / (2.0 * n);        for(j=0;j<n;j++) {            window[n - j - 1] = sin((j + 0.5) * alpha);        }        s->windows[i] = window;    }    s->reset_block_lengths = 1;        if (s->use_noise_coding) {        /* init the noise generator */        if (s->use_exp_vlc)            s->noise_mult = 0.02;        else            s->noise_mult = 0.04;               #ifdef TRACE        for(i=0;i<NOISE_TAB_SIZE;i++)            s->noise_table[i] = 1.0 * s->noise_mult;#else        {            unsigned int seed;            float norm;            seed = 1;            norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;            for(i=0;i<NOISE_TAB_SIZE;i++) {                seed = seed * 314159 + 1;                s->noise_table[i] = (float)((int)seed) * norm;            }        }#endif        init_vlc(&s->hgain_vlc, 9, sizeof(hgain_huffbits),                  hgain_huffbits, 1, 1,                 hgain_huffcodes, 2, 2);    }    if (s->use_exp_vlc) {        init_vlc(&s->exp_vlc, 9, sizeof(scale_huffbits),                  scale_huffbits, 1, 1,                 scale_huffcodes, 4, 4);    } else {        wma_lsp_to_curve_init(s, s->frame_len);    }    /* choose the VLC tables for the coefficients */    coef_vlc_table = 2;    if (s->sample_rate >= 32000) {        if (bps1 < 0.72)            coef_vlc_table = 0;        else if (bps1 < 1.16)            coef_vlc_table = 1;    }    init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0],                  &coef_vlcs[coef_vlc_table * 2]);    init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1],                  &coef_vlcs[coef_vlc_table * 2 + 1]);    return 0;}