making act segmenter

1 files changed, 974 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/wmadec.c b/ffmpeg/libavcodec/wmadec.c
new file mode 100644
index 0000000..0648c1e
--- /dev/null
+++ b/ffmpeg/libavcodec/wmadec.c
@@ -0,0 +1,974 @@
+/*
+ * WMA compatible decoder
+ * Copyright (c) 2002 The FFmpeg Project
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * WMA compatible decoder.
+ * This decoder handles Microsoft Windows Media Audio data, versions 1 & 2.
+ * WMA v1 is identified by audio format 0x160 in Microsoft media files
+ * (ASF/AVI/WAV). WMA v2 is identified by audio format 0x161.
+ *
+ * To use this decoder, a calling application must supply the extra data
+ * bytes provided with the WMA data. These are the extra, codec-specific
+ * bytes at the end of a WAVEFORMATEX data structure. Transmit these bytes
+ * to the decoder using the extradata[_size] fields in AVCodecContext. There
+ * should be 4 extra bytes for v1 data and 6 extra bytes for v2 data.
+ */
+
+#include "avcodec.h"
+#include "internal.h"
+#include "wma.h"
+
+#undef NDEBUG
+#include <assert.h>
+
+#define EXPVLCBITS 8
+#define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS)
+
+#define HGAINVLCBITS 9
+#define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS)
+
+static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len);
+
+#ifdef TRACE
+static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n)
+{
+    int i;
+
+    tprintf(s->avctx, "%s[%d]:\n", name, n);
+    for(i=0;i<n;i++) {
+        if ((i & 7) == 0)
+            tprintf(s->avctx, "%4d: ", i);
+        tprintf(s->avctx, " %8.*f", prec, tab[i]);
+        if ((i & 7) == 7)
+            tprintf(s->avctx, "\n");
+    }
+    if ((i & 7) != 0)
+        tprintf(s->avctx, "\n");
+}
+#endif
+
+static int wma_decode_init(AVCodecContext * avctx)
+{
+    WMACodecContext *s = avctx->priv_data;
+    int i, flags2;
+    uint8_t *extradata;
+
+    if (!avctx->block_align) {
+        av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
+        return AVERROR(EINVAL);
+    }
+
+    s->avctx = avctx;
+
+    /* extract flag infos */
+    flags2 = 0;
+    extradata = avctx->extradata;
+    if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4) {
+        flags2 = AV_RL16(extradata+2);
+    } else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6) {
+        flags2 = AV_RL16(extradata+4);
+    }
+
+    s->use_exp_vlc = flags2 & 0x0001;
+    s->use_bit_reservoir = flags2 & 0x0002;
+    s->use_variable_block_len = flags2 & 0x0004;
+
+    if(avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){
+        if(AV_RL16(extradata+4)==0xd && s->use_variable_block_len){
+            av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n");
+            s->use_variable_block_len= 0; // this fixes issue1503
+        }
+    }
+
+    if(ff_wma_init(avctx, flags2)<0)
+        return -1;
+
+    /* 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, 1.0 / 32768.0);
+
+    if (s->use_noise_coding) {
+        init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits),
+                 ff_wma_hgain_huffbits, 1, 1,
+                 ff_wma_hgain_huffcodes, 2, 2, 0);
+    }
+
+    if (s->use_exp_vlc) {
+        init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), //FIXME move out of context
+                 ff_aac_scalefactor_bits, 1, 1,
+                 ff_aac_scalefactor_code, 4, 4, 0);
+    } else {
+        wma_lsp_to_curve_init(s, s->frame_len);
+    }
+
+    avctx->sample_fmt = AV_SAMPLE_FMT_FLTP;
+
+    return 0;
+}
+
+/**
+ * compute x^-0.25 with an exponent and mantissa table. We use linear
+ * interpolation to reduce the mantissa table size at a small speed
+ * expense (linear interpolation approximately doubles the number of
+ * bits of precision).
+ */
+static inline float pow_m1_4(WMACodecContext *s, float x)
+{
+    union {
+        float f;
+        unsigned int v;
+    } u, t;
+    unsigned int e, m;
+    float a, b;
+
+    u.f = x;
+    e = u.v >> 23;
+    m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
+    /* build interpolation scale: 1 <= t < 2. */
+    t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
+    a = s->lsp_pow_m_table1[m];
+    b = s->lsp_pow_m_table2[m];
+    return s->lsp_pow_e_table[e] * (a + b * t.f);
+}
+
+static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len)
+{
+    float wdel, a, b;
+    int i, e, m;
+
+    wdel = M_PI / frame_len;
+    for(i=0;i<frame_len;i++)
+        s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
+
+    /* tables for x^-0.25 computation */
+    for(i=0;i<256;i++) {
+        e = i - 126;
+        s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
+    }
+
+    /* NOTE: these two tables are needed to avoid two operations in
+       pow_m1_4 */
+    b = 1.0;
+    for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
+        m = (1 << LSP_POW_BITS) + i;
+        a = (float)m * (0.5 / (1 << LSP_POW_BITS));
+        a = pow(a, -0.25);
+        s->lsp_pow_m_table1[i] = 2 * a - b;
+        s->lsp_pow_m_table2[i] = b - a;
+        b = a;
+    }
+}
+
+/**
+ * NOTE: We use the same code as Vorbis here
+ * @todo optimize it further with SSE/3Dnow
+ */
+static void wma_lsp_to_curve(WMACodecContext *s,
+                             float *out, float *val_max_ptr,
+                             int n, float *lsp)
+{
+    int i, j;
+    float p, q, w, v, val_max;
+
+    val_max = 0;
+    for(i=0;i<n;i++) {
+        p = 0.5f;
+        q = 0.5f;
+        w = s->lsp_cos_table[i];
+        for(j=1;j<NB_LSP_COEFS;j+=2){
+            q *= w - lsp[j - 1];
+            p *= w - lsp[j];
+        }
+        p *= p * (2.0f - w);
+        q *= q * (2.0f + w);
+        v = p + q;
+        v = pow_m1_4(s, v);
+        if (v > val_max)
+            val_max = v;
+        out[i] = v;
+    }
+    *val_max_ptr = val_max;
+}
+
+/**
+ * decode exponents coded with LSP coefficients (same idea as Vorbis)
+ */
+static void decode_exp_lsp(WMACodecContext *s, int ch)
+{
+    float lsp_coefs[NB_LSP_COEFS];
+    int val, i;
+
+    for(i = 0; i < NB_LSP_COEFS; i++) {
+        if (i == 0 || i >= 8)
+            val = get_bits(&s->gb, 3);
+        else
+            val = get_bits(&s->gb, 4);
+        lsp_coefs[i] = ff_wma_lsp_codebook[i][val];
+    }
+
+    wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
+                     s->block_len, lsp_coefs);
+}
+
+/** pow(10, i / 16.0) for i in -60..95 */
+static const float pow_tab[] = {
+    1.7782794100389e-04, 2.0535250264571e-04,
+    2.3713737056617e-04, 2.7384196342644e-04,
+    3.1622776601684e-04, 3.6517412725484e-04,
+    4.2169650342858e-04, 4.8696752516586e-04,
+    5.6234132519035e-04, 6.4938163157621e-04,
+    7.4989420933246e-04, 8.6596432336006e-04,
+    1.0000000000000e-03, 1.1547819846895e-03,
+    1.3335214321633e-03, 1.5399265260595e-03,
+    1.7782794100389e-03, 2.0535250264571e-03,
+    2.3713737056617e-03, 2.7384196342644e-03,
+    3.1622776601684e-03, 3.6517412725484e-03,
+    4.2169650342858e-03, 4.8696752516586e-03,
+    5.6234132519035e-03, 6.4938163157621e-03,
+    7.4989420933246e-03, 8.6596432336006e-03,
+    1.0000000000000e-02, 1.1547819846895e-02,
+    1.3335214321633e-02, 1.5399265260595e-02,
+    1.7782794100389e-02, 2.0535250264571e-02,
+    2.3713737056617e-02, 2.7384196342644e-02,
+    3.1622776601684e-02, 3.6517412725484e-02,
+    4.2169650342858e-02, 4.8696752516586e-02,
+    5.6234132519035e-02, 6.4938163157621e-02,
+    7.4989420933246e-02, 8.6596432336007e-02,
+    1.0000000000000e-01, 1.1547819846895e-01,
+    1.3335214321633e-01, 1.5399265260595e-01,
+    1.7782794100389e-01, 2.0535250264571e-01,
+    2.3713737056617e-01, 2.7384196342644e-01,
+    3.1622776601684e-01, 3.6517412725484e-01,
+    4.2169650342858e-01, 4.8696752516586e-01,
+    5.6234132519035e-01, 6.4938163157621e-01,
+    7.4989420933246e-01, 8.6596432336007e-01,
+    1.0000000000000e+00, 1.1547819846895e+00,
+    1.3335214321633e+00, 1.5399265260595e+00,
+    1.7782794100389e+00, 2.0535250264571e+00,
+    2.3713737056617e+00, 2.7384196342644e+00,
+    3.1622776601684e+00, 3.6517412725484e+00,
+    4.2169650342858e+00, 4.8696752516586e+00,
+    5.6234132519035e+00, 6.4938163157621e+00,
+    7.4989420933246e+00, 8.6596432336007e+00,
+    1.0000000000000e+01, 1.1547819846895e+01,
+    1.3335214321633e+01, 1.5399265260595e+01,
+    1.7782794100389e+01, 2.0535250264571e+01,
+    2.3713737056617e+01, 2.7384196342644e+01,
+    3.1622776601684e+01, 3.6517412725484e+01,
+    4.2169650342858e+01, 4.8696752516586e+01,
+    5.6234132519035e+01, 6.4938163157621e+01,
+    7.4989420933246e+01, 8.6596432336007e+01,
+    1.0000000000000e+02, 1.1547819846895e+02,
+    1.3335214321633e+02, 1.5399265260595e+02,
+    1.7782794100389e+02, 2.0535250264571e+02,
+    2.3713737056617e+02, 2.7384196342644e+02,
+    3.1622776601684e+02, 3.6517412725484e+02,
+    4.2169650342858e+02, 4.8696752516586e+02,
+    5.6234132519035e+02, 6.4938163157621e+02,
+    7.4989420933246e+02, 8.6596432336007e+02,
+    1.0000000000000e+03, 1.1547819846895e+03,
+    1.3335214321633e+03, 1.5399265260595e+03,
+    1.7782794100389e+03, 2.0535250264571e+03,
+    2.3713737056617e+03, 2.7384196342644e+03,
+    3.1622776601684e+03, 3.6517412725484e+03,
+    4.2169650342858e+03, 4.8696752516586e+03,
+    5.6234132519035e+03, 6.4938163157621e+03,
+    7.4989420933246e+03, 8.6596432336007e+03,
+    1.0000000000000e+04, 1.1547819846895e+04,
+    1.3335214321633e+04, 1.5399265260595e+04,
+    1.7782794100389e+04, 2.0535250264571e+04,
+    2.3713737056617e+04, 2.7384196342644e+04,
+    3.1622776601684e+04, 3.6517412725484e+04,
+    4.2169650342858e+04, 4.8696752516586e+04,
+    5.6234132519035e+04, 6.4938163157621e+04,
+    7.4989420933246e+04, 8.6596432336007e+04,
+    1.0000000000000e+05, 1.1547819846895e+05,
+    1.3335214321633e+05, 1.5399265260595e+05,
+    1.7782794100389e+05, 2.0535250264571e+05,
+    2.3713737056617e+05, 2.7384196342644e+05,
+    3.1622776601684e+05, 3.6517412725484e+05,
+    4.2169650342858e+05, 4.8696752516586e+05,
+    5.6234132519035e+05, 6.4938163157621e+05,
+    7.4989420933246e+05, 8.6596432336007e+05,
+};
+
+/**
+ * decode exponents coded with VLC codes
+ */
+static int decode_exp_vlc(WMACodecContext *s, int ch)
+{
+    int last_exp, n, code;
+    const uint16_t *ptr;
+    float v, max_scale;
+    uint32_t *q, *q_end, iv;
+    const float *ptab = pow_tab + 60;
+    const uint32_t *iptab = (const uint32_t*)ptab;
+
+    ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
+    q = (uint32_t *)s->exponents[ch];
+    q_end = q + s->block_len;
+    max_scale = 0;
+    if (s->version == 1) {
+        last_exp = get_bits(&s->gb, 5) + 10;
+        v = ptab[last_exp];
+        iv = iptab[last_exp];
+        max_scale = v;
+        n = *ptr++;
+        switch (n & 3) do {
+        case 0: *q++ = iv;
+        case 3: *q++ = iv;
+        case 2: *q++ = iv;
+        case 1: *q++ = iv;
+        } while ((n -= 4) > 0);
+    }else
+        last_exp = 36;
+
+    while (q < q_end) {
+        code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX);
+        if (code < 0){
+            av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n");
+            return -1;
+        }
+        /* NOTE: this offset is the same as MPEG4 AAC ! */
+        last_exp += code - 60;
+        if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) {
+            av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n",
+                   last_exp);
+            return -1;
+        }
+        v = ptab[last_exp];
+        iv = iptab[last_exp];
+        if (v > max_scale)
+            max_scale = v;
+        n = *ptr++;
+        switch (n & 3) do {
+        case 0: *q++ = iv;
+        case 3: *q++ = iv;
+        case 2: *q++ = iv;
+        case 1: *q++ = iv;
+        } while ((n -= 4) > 0);
+    }
+    s->max_exponent[ch] = max_scale;
+    return 0;
+}
+
+
+/**
+ * Apply MDCT window and add into output.
+ *
+ * We ensure that when the windows overlap their squared sum
+ * is always 1 (MDCT reconstruction rule).
+ */
+static void wma_window(WMACodecContext *s, float *out)
+{
+    float *in = s->output;
+    int block_len, bsize, n;
+
+    /* left part */
+    if (s->block_len_bits <= s->prev_block_len_bits) {
+        block_len = s->block_len;
+        bsize = s->frame_len_bits - s->block_len_bits;
+
+        s->fdsp.vector_fmul_add(out, in, s->windows[bsize],
+                                out, block_len);
+
+    } else {
+        block_len = 1 << s->prev_block_len_bits;
+        n = (s->block_len - block_len) / 2;
+        bsize = s->frame_len_bits - s->prev_block_len_bits;
+
+        s->fdsp.vector_fmul_add(out+n, in+n, s->windows[bsize],
+                                out+n, block_len);
+
+        memcpy(out+n+block_len, in+n+block_len, n*sizeof(float));
+    }
+
+    out += s->block_len;
+    in += s->block_len;
+
+    /* right part */
+    if (s->block_len_bits <= s->next_block_len_bits) {
+        block_len = s->block_len;
+        bsize = s->frame_len_bits - s->block_len_bits;
+
+        s->fdsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len);
+
+    } else {
+        block_len = 1 << s->next_block_len_bits;
+        n = (s->block_len - block_len) / 2;
+        bsize = s->frame_len_bits - s->next_block_len_bits;
+
+        memcpy(out, in, n*sizeof(float));
+
+        s->fdsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len);
+
+        memset(out+n+block_len, 0, n*sizeof(float));
+    }
+}
+
+
+/**
+ * @return 0 if OK. 1 if last block of frame. return -1 if
+ * unrecorrable error.
+ */
+static int wma_decode_block(WMACodecContext *s)
+{
+    int n, v, a, ch, bsize;
+    int coef_nb_bits, total_gain;
+    int nb_coefs[MAX_CHANNELS];
+    float mdct_norm;
+    FFTContext *mdct;
+
+#ifdef TRACE
+    tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num);
+#endif
+
+    /* compute current block length */
+    if (s->use_variable_block_len) {
+        n = av_log2(s->nb_block_sizes - 1) + 1;
+
+        if (s->reset_block_lengths) {
+            s->reset_block_lengths = 0;
+            v = get_bits(&s->gb, n);
+            if (v >= s->nb_block_sizes){
+                av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v);
+                return -1;
+            }
+            s->prev_block_len_bits = s->frame_len_bits - v;
+            v = get_bits(&s->gb, n);
+            if (v >= s->nb_block_sizes){
+                av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v);
+                return -1;
+            }
+            s->block_len_bits = s->frame_len_bits - v;
+        } else {
+            /* update block lengths */
+            s->prev_block_len_bits = s->block_len_bits;
+            s->block_len_bits = s->next_block_len_bits;
+        }
+        v = get_bits(&s->gb, n);
+        if (v >= s->nb_block_sizes){
+            av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v);
+            return -1;
+        }
+        s->next_block_len_bits = s->frame_len_bits - v;
+    } else {
+        /* fixed block len */
+        s->next_block_len_bits = s->frame_len_bits;
+        s->prev_block_len_bits = s->frame_len_bits;
+        s->block_len_bits = s->frame_len_bits;
+    }
+
+    if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
+        av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
+        return -1;
+    }
+
+    /* now check if the block length is coherent with the frame length */
+    s->block_len = 1 << s->block_len_bits;
+    if ((s->block_pos + s->block_len) > s->frame_len){
+        av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n");
+        return -1;
+    }
+
+    if (s->avctx->channels == 2) {
+        s->ms_stereo = get_bits1(&s->gb);
+    }
+    v = 0;
+    for(ch = 0; ch < s->avctx->channels; ch++) {
+        a = get_bits1(&s->gb);
+        s->channel_coded[ch] = a;
+        v |= a;
+    }
+
+    bsize = s->frame_len_bits - s->block_len_bits;
+
+    /* if no channel coded, no need to go further */
+    /* XXX: fix potential framing problems */
+    if (!v)
+        goto next;
+
+    /* read total gain and extract corresponding number of bits for
+       coef escape coding */
+    total_gain = 1;
+    for(;;) {
+        a = get_bits(&s->gb, 7);
+        total_gain += a;
+        if (a != 127)
+            break;
+    }
+
+    coef_nb_bits= ff_wma_total_gain_to_bits(total_gain);
+
+    /* compute number of coefficients */
+    n = s->coefs_end[bsize] - s->coefs_start;
+    for(ch = 0; ch < s->avctx->channels; ch++)
+        nb_coefs[ch] = n;
+
+    /* complex coding */
+    if (s->use_noise_coding) {
+
+        for(ch = 0; ch < s->avctx->channels; ch++) {
+            if (s->channel_coded[ch]) {
+                int i, n, a;
+                n = s->exponent_high_sizes[bsize];
+                for(i=0;i<n;i++) {
+                    a = get_bits1(&s->gb);
+                    s->high_band_coded[ch][i] = a;
+                    /* if noise coding, the coefficients are not transmitted */
+                    if (a)
+                        nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
+                }
+            }
+        }
+        for(ch = 0; ch < s->avctx->channels; ch++) {
+            if (s->channel_coded[ch]) {
+                int i, n, val, code;
+
+                n = s->exponent_high_sizes[bsize];
+                val = (int)0x80000000;
+                for(i=0;i<n;i++) {
+                    if (s->high_band_coded[ch][i]) {
+                        if (val == (int)0x80000000) {
+                            val = get_bits(&s->gb, 7) - 19;
+                        } else {
+                            code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX);
+                            if (code < 0){
+                                av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n");
+                                return -1;
+                            }
+                            val += code - 18;
+                        }
+                        s->high_band_values[ch][i] = val;
+                    }
+                }
+            }
+        }
+    }
+
+    /* exponents can be reused in short blocks. */
+    if ((s->block_len_bits == s->frame_len_bits) ||
+        get_bits1(&s->gb)) {
+        for(ch = 0; ch < s->avctx->channels; ch++) {
+            if (s->channel_coded[ch]) {
+                if (s->use_exp_vlc) {
+                    if (decode_exp_vlc(s, ch) < 0)
+                        return -1;
+                } else {
+                    decode_exp_lsp(s, ch);
+                }
+                s->exponents_bsize[ch] = bsize;
+            }
+        }
+    }
+
+    /* parse spectral coefficients : just RLE encoding */
+    for (ch = 0; ch < s->avctx->channels; ch++) {
+        if (s->channel_coded[ch]) {
+            int tindex;
+            WMACoef* ptr = &s->coefs1[ch][0];
+
+            /* special VLC tables are used for ms stereo because
+               there is potentially less energy there */
+            tindex = (ch == 1 && s->ms_stereo);
+            memset(ptr, 0, s->block_len * sizeof(WMACoef));
+            ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex],
+                  s->level_table[tindex], s->run_table[tindex],
+                  0, ptr, 0, nb_coefs[ch],
+                  s->block_len, s->frame_len_bits, coef_nb_bits);
+        }
+        if (s->version == 1 && s->avctx->channels >= 2) {
+            align_get_bits(&s->gb);
+        }
+    }
+
+    /* normalize */
+    {
+        int n4 = s->block_len / 2;
+        mdct_norm = 1.0 / (float)n4;
+        if (s->version == 1) {
+            mdct_norm *= sqrt(n4);
+        }
+    }
+
+    /* finally compute the MDCT coefficients */
+    for (ch = 0; ch < s->avctx->channels; ch++) {
+        if (s->channel_coded[ch]) {
+            WMACoef *coefs1;
+            float *coefs, *exponents, mult, mult1, noise;
+            int i, j, n, n1, last_high_band, esize;
+            float exp_power[HIGH_BAND_MAX_SIZE];
+
+            coefs1 = s->coefs1[ch];
+            exponents = s->exponents[ch];
+            esize = s->exponents_bsize[ch];
+            mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
+            mult *= mdct_norm;
+            coefs = s->coefs[ch];
+            if (s->use_noise_coding) {
+                mult1 = mult;
+                /* very low freqs : noise */
+                for(i = 0;i < s->coefs_start; i++) {
+                    *coefs++ = s->noise_table[s->noise_index] *
+                      exponents[i<<bsize>>esize] * mult1;
+                    s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
+                }
+
+                n1 = s->exponent_high_sizes[bsize];
+
+                /* compute power of high bands */
+                exponents = s->exponents[ch] +
+                    (s->high_band_start[bsize]<<bsize>>esize);
+                last_high_band = 0; /* avoid warning */
+                for(j=0;j<n1;j++) {
+                    n = s->exponent_high_bands[s->frame_len_bits -
+                                              s->block_len_bits][j];
+                    if (s->high_band_coded[ch][j]) {
+                        float e2, v;
+                        e2 = 0;
+                        for(i = 0;i < n; i++) {
+                            v = exponents[i<<bsize>>esize];
+                            e2 += v * v;
+                        }
+                        exp_power[j] = e2 / n;
+                        last_high_band = j;
+                        tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n);
+                    }
+                    exponents += n<<bsize>>esize;
+                }
+
+                /* main freqs and high freqs */
+                exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize);
+                for(j=-1;j<n1;j++) {
+                    if (j < 0) {
+                        n = s->high_band_start[bsize] -
+                            s->coefs_start;
+                    } else {
+                        n = s->exponent_high_bands[s->frame_len_bits -
+                                                  s->block_len_bits][j];
+                    }
+                    if (j >= 0 && s->high_band_coded[ch][j]) {
+                        /* use noise with specified power */
+                        mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
+                        /* XXX: use a table */
+                        mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
+                        mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
+                        mult1 *= mdct_norm;
+                        for(i = 0;i < n; i++) {
+                            noise = s->noise_table[s->noise_index];
+                            s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
+                            *coefs++ =  noise *
+                                exponents[i<<bsize>>esize] * mult1;
+                        }
+                        exponents += n<<bsize>>esize;
+                    } else {
+                        /* coded values + small noise */
+                        for(i = 0;i < n; i++) {
+                            noise = s->noise_table[s->noise_index];
+                            s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
+                            *coefs++ = ((*coefs1++) + noise) *
+                                exponents[i<<bsize>>esize] * mult;
+                        }
+                        exponents += n<<bsize>>esize;
+                    }
+                }
+
+                /* very high freqs : noise */
+                n = s->block_len - s->coefs_end[bsize];
+                mult1 = mult * exponents[((-1<<bsize))>>esize];
+                for(i = 0; i < n; i++) {
+                    *coefs++ = s->noise_table[s->noise_index] * mult1;
+                    s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
+                }
+            } else {
+                /* XXX: optimize more */
+                for(i = 0;i < s->coefs_start; i++)
+                    *coefs++ = 0.0;
+                n = nb_coefs[ch];
+                for(i = 0;i < n; i++) {
+                    *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult;
+                }
+                n = s->block_len - s->coefs_end[bsize];
+                for(i = 0;i < n; i++)
+                    *coefs++ = 0.0;
+            }
+        }
+    }
+
+#ifdef TRACE
+    for (ch = 0; ch < s->avctx->channels; ch++) {
+        if (s->channel_coded[ch]) {
+            dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len);
+            dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len);
+        }
+    }
+#endif
+
+    if (s->ms_stereo && s->channel_coded[1]) {
+        /* nominal case for ms stereo: we do it before mdct */
+        /* no need to optimize this case because it should almost
+           never happen */
+        if (!s->channel_coded[0]) {
+            tprintf(s->avctx, "rare ms-stereo case happened\n");
+            memset(s->coefs[0], 0, sizeof(float) * s->block_len);
+            s->channel_coded[0] = 1;
+        }
+
+        s->fdsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len);
+    }
+
+next:
+    mdct = &s->mdct_ctx[bsize];
+
+    for (ch = 0; ch < s->avctx->channels; ch++) {
+        int n4, index;
+
+        n4 = s->block_len / 2;
+        if(s->channel_coded[ch]){
+            mdct->imdct_calc(mdct, s->output, s->coefs[ch]);
+        }else if(!(s->ms_stereo && ch==1))
+            memset(s->output, 0, sizeof(s->output));
+
+        /* multiply by the window and add in the frame */
+        index = (s->frame_len / 2) + s->block_pos - n4;
+        wma_window(s, &s->frame_out[ch][index]);
+    }
+
+    /* update block number */
+    s->block_num++;
+    s->block_pos += s->block_len;
+    if (s->block_pos >= s->frame_len)
+        return 1;
+    else
+        return 0;
+}
+
+/* decode a frame of frame_len samples */
+static int wma_decode_frame(WMACodecContext *s, float **samples,
+                            int samples_offset)
+{
+    int ret, ch;
+
+#ifdef TRACE
+    tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len);
+#endif
+
+    /* read each block */
+    s->block_num = 0;
+    s->block_pos = 0;
+    for(;;) {
+        ret = wma_decode_block(s);
+        if (ret < 0)
+            return -1;
+        if (ret)
+            break;
+    }
+
+    for (ch = 0; ch < s->avctx->channels; ch++) {
+        /* copy current block to output */
+        memcpy(samples[ch] + samples_offset, s->frame_out[ch],
+               s->frame_len * sizeof(*s->frame_out[ch]));
+        /* prepare for next block */
+        memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
+                s->frame_len * sizeof(*s->frame_out[ch]));
+
+#ifdef TRACE
+        dump_floats(s, "samples", 6, samples[ch] + samples_offset, s->frame_len);
+#endif
+    }
+
+    return 0;
+}
+
+static int wma_decode_superframe(AVCodecContext *avctx, void *data,
+                                 int *got_frame_ptr, AVPacket *avpkt)
+{
+    AVFrame *frame     = data;
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    WMACodecContext *s = avctx->priv_data;
+    int nb_frames, bit_offset, i, pos, len, ret;
+    uint8_t *q;
+    float **samples;
+    int samples_offset;
+
+    tprintf(avctx, "***decode_superframe:\n");
+
+    if(buf_size==0){
+        s->last_superframe_len = 0;
+        return 0;
+    }
+    if (buf_size < avctx->block_align) {
+        av_log(avctx, AV_LOG_ERROR,
+               "Input packet size too small (%d < %d)\n",
+               buf_size, avctx->block_align);
+        return AVERROR_INVALIDDATA;
+    }
+    if(avctx->block_align)
+        buf_size = avctx->block_align;
+
+    init_get_bits(&s->gb, buf, buf_size*8);
+
+    if (s->use_bit_reservoir) {
+        /* read super frame header */
+        skip_bits(&s->gb, 4); /* super frame index */
+        nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
+        if (nb_frames <= 0) {
+            av_log(avctx, AV_LOG_ERROR, "nb_frames is %d\n", nb_frames);
+            return AVERROR_INVALIDDATA;
+        }
+    } else {
+        nb_frames = 1;
+    }
+
+    /* get output buffer */
+    frame->nb_samples = nb_frames * s->frame_len;
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+    samples = (float **)frame->extended_data;
+    samples_offset = 0;
+
+    if (s->use_bit_reservoir) {
+        bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
+        if (bit_offset > get_bits_left(&s->gb)) {
+            av_log(avctx, AV_LOG_ERROR,
+                   "Invalid last frame bit offset %d > buf size %d (%d)\n",
+                   bit_offset, get_bits_left(&s->gb), buf_size);
+            goto fail;
+        }
+
+        if (s->last_superframe_len > 0) {
+            /* add bit_offset bits to last frame */
+            if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
+                MAX_CODED_SUPERFRAME_SIZE)
+                goto fail;
+            q = s->last_superframe + s->last_superframe_len;
+            len = bit_offset;
+            while (len > 7) {
+                *q++ = (get_bits)(&s->gb, 8);
+                len -= 8;
+            }
+            if (len > 0) {
+                *q++ = (get_bits)(&s->gb, len) << (8 - len);
+            }
+            memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+
+            /* XXX: bit_offset bits into last frame */
+            init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset);
+            /* skip unused bits */
+            if (s->last_bitoffset > 0)
+                skip_bits(&s->gb, s->last_bitoffset);
+            /* this frame is stored in the last superframe and in the
+               current one */
+            if (wma_decode_frame(s, samples, samples_offset) < 0)
+                goto fail;
+            samples_offset += s->frame_len;
+            nb_frames--;
+        }
+
+        /* read each frame starting from bit_offset */
+        pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
+        if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8)
+            return AVERROR_INVALIDDATA;
+        init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8);
+        len = pos & 7;
+        if (len > 0)
+            skip_bits(&s->gb, len);
+
+        s->reset_block_lengths = 1;
+        for(i=0;i<nb_frames;i++) {
+            if (wma_decode_frame(s, samples, samples_offset) < 0)
+                goto fail;
+            samples_offset += s->frame_len;
+        }
+
+        /* we copy the end of the frame in the last frame buffer */
+        pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
+        s->last_bitoffset = pos & 7;
+        pos >>= 3;
+        len = buf_size - pos;
+        if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
+            av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len);
+            goto fail;
+        }
+        s->last_superframe_len = len;
+        memcpy(s->last_superframe, buf + pos, len);
+    } else {
+        /* single frame decode */
+        if (wma_decode_frame(s, samples, samples_offset) < 0)
+            goto fail;
+        samples_offset += s->frame_len;
+    }
+
+    av_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n",
+            s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len,
+            (int8_t *)samples - (int8_t *)data, avctx->block_align);
+
+    *got_frame_ptr = 1;
+
+    return buf_size;
+ fail:
+    /* when error, we reset the bit reservoir */
+    s->last_superframe_len = 0;
+    return -1;
+}
+
+static av_cold void flush(AVCodecContext *avctx)
+{
+    WMACodecContext *s = avctx->priv_data;
+
+    s->last_bitoffset=
+    s->last_superframe_len= 0;
+}
+
+#if CONFIG_WMAV1_DECODER
+AVCodec ff_wmav1_decoder = {
+    .name           = "wmav1",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_WMAV1,
+    .priv_data_size = sizeof(WMACodecContext),
+    .init           = wma_decode_init,
+    .close          = ff_wma_end,
+    .decode         = wma_decode_superframe,
+    .flush          = flush,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"),
+    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_NONE },
+};
+#endif
+#if CONFIG_WMAV2_DECODER
+AVCodec ff_wmav2_decoder = {
+    .name           = "wmav2",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_WMAV2,
+    .priv_data_size = sizeof(WMACodecContext),
+    .init           = wma_decode_init,
+    .close          = ff_wma_end,
+    .decode         = wma_decode_superframe,
+    .flush          = flush,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"),
+    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_NONE },
+};
+#endif