+++ /dev/null
-/*
- * WMA compatible decoder
- * Copyright (c) 2002 The FFmpeg Project.
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-/**
- * @file wmadec.c
- * WMA compatible decoder.
- */
-
-#include "avcodec.h"
-#include "dsputil.h"
-
-/* size of blocks */
-#define BLOCK_MIN_BITS 7
-#define BLOCK_MAX_BITS 11
-#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
-
-#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
-
-/* XXX: find exact max size */
-#define HIGH_BAND_MAX_SIZE 16
-
-#define NB_LSP_COEFS 10
-
-/* XXX: is it a suitable value ? */
-#define MAX_CODED_SUPERFRAME_SIZE 4096
-
-#define MAX_CHANNELS 2
-
-#define NOISE_TAB_SIZE 8192
-
-#define LSP_POW_BITS 7
-
-typedef struct WMADecodeContext {
- GetBitContext gb;
- int sample_rate;
- int nb_channels;
- int bit_rate;
- int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
- int block_align;
- int use_bit_reservoir;
- int use_variable_block_len;
- int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */
- int use_noise_coding; /* true if perceptual noise is added */
- int byte_offset_bits;
- VLC exp_vlc;
- int exponent_sizes[BLOCK_NB_SIZES];
- uint16_t exponent_bands[BLOCK_NB_SIZES][25];
- int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
- int coefs_start; /* first coded coef */
- int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
- int exponent_high_sizes[BLOCK_NB_SIZES];
- int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
- VLC hgain_vlc;
-
- /* coded values in high bands */
- int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
- int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
-
- /* there are two possible tables for spectral coefficients */
- VLC coef_vlc[2];
- uint16_t *run_table[2];
- uint16_t *level_table[2];
- /* frame info */
- int frame_len; /* frame length in samples */
- int frame_len_bits; /* frame_len = 1 << frame_len_bits */
- int nb_block_sizes; /* number of block sizes */
- /* block info */
- int reset_block_lengths;
- int block_len_bits; /* log2 of current block length */
- int next_block_len_bits; /* log2 of next block length */
- int prev_block_len_bits; /* log2 of prev block length */
- int block_len; /* block length in samples */
- int block_num; /* block number in current frame */
- int block_pos; /* current position in frame */
- uint8_t ms_stereo; /* true if mid/side stereo mode */
- uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
- float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE] __attribute__((aligned(16)));
- float max_exponent[MAX_CHANNELS];
- int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
- float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE] __attribute__((aligned(16)));
- MDCTContext mdct_ctx[BLOCK_NB_SIZES];
- float *windows[BLOCK_NB_SIZES];
- FFTSample mdct_tmp[BLOCK_MAX_SIZE] __attribute__((aligned(16))); /* temporary storage for imdct */
- /* output buffer for one frame and the last for IMDCT windowing */
- float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2] __attribute__((aligned(16)));
- /* last frame info */
- uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
- int last_bitoffset;
- int last_superframe_len;
- float noise_table[NOISE_TAB_SIZE];
- int noise_index;
- float noise_mult; /* XXX: suppress that and integrate it in the noise array */
- /* lsp_to_curve tables */
- float lsp_cos_table[BLOCK_MAX_SIZE];
- float lsp_pow_e_table[256];
- float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
- float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
-
-#ifdef TRACE
- int frame_count;
-#endif
-} WMADecodeContext;
-
-typedef struct CoefVLCTable {
- int n; /* total number of codes */
- const uint32_t *huffcodes; /* VLC bit values */
- const uint8_t *huffbits; /* VLC bit size */
- const uint16_t *levels; /* table to build run/level tables */
-} CoefVLCTable;
-
-static void wma_lsp_to_curve_init(WMADecodeContext *s, int frame_len);
-
-#include "wmadata.h"
-
-#ifdef TRACE
-static void dump_shorts(const char *name, const short *tab, int n)
-{
- int i;
-
- tprintf("%s[%d]:\n", name, n);
- for(i=0;i<n;i++) {
- if ((i & 7) == 0)
- tprintf("%4d: ", i);
- tprintf(" %5d.0", tab[i]);
- if ((i & 7) == 7)
- tprintf("\n");
- }
-}
-
-static void dump_floats(const char *name, int prec, const float *tab, int n)
-{
- int i;
-
- tprintf("%s[%d]:\n", name, n);
- for(i=0;i<n;i++) {
- if ((i & 7) == 0)
- tprintf("%4d: ", i);
- tprintf(" %8.*f", prec, tab[i]);
- if ((i & 7) == 7)
- tprintf("\n");
- }
- if ((i & 7) != 0)
- tprintf("\n");
-}
-#endif
-
-/* XXX: use same run/length optimization as mpeg decoders */
-static void init_coef_vlc(VLC *vlc,
- uint16_t **prun_table, uint16_t **plevel_table,
- const CoefVLCTable *vlc_table)
-{
- int n = vlc_table->n;
- const uint8_t *table_bits = vlc_table->huffbits;
- const uint32_t *table_codes = vlc_table->huffcodes;
- const uint16_t *levels_table = vlc_table->levels;
- uint16_t *run_table, *level_table;
- const uint16_t *p;
- int i, l, j, level;
-
- init_vlc(vlc, 9, n, table_bits, 1, 1, table_codes, 4, 4);
-
- run_table = av_malloc(n * sizeof(uint16_t));
- level_table = av_malloc(n * sizeof(uint16_t));
- p = levels_table;
- i = 2;
- level = 1;
- while (i < n) {
- l = *p++;
- for(j=0;j<l;j++) {
- run_table[i] = j;
- level_table[i] = level;
- i++;
- }
- level++;
- }
- *prun_table = run_table;
- *plevel_table = level_table;
-}
-
-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;
-}
-
-/* interpolate values for a bigger or smaller block. The block must
- have multiple sizes */
-static void interpolate_array(float *scale, int old_size, int new_size)
-{
- int i, j, jincr, k;
- float v;
-
- if (new_size > old_size) {
- jincr = new_size / old_size;
- j = new_size;
- for(i = old_size - 1; i >=0; i--) {
- v = scale[i];
- k = jincr;
- do {
- scale[--j] = v;
- } while (--k);
- }
- } else if (new_size < old_size) {
- j = 0;
- jincr = old_size / new_size;
- for(i = 0; i < new_size; i++) {
- scale[i] = scale[j];
- j += jincr;
- }
- }
-}
-
-/* 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(WMADecodeContext *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(WMADecodeContext *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;
- }
-#if 0
- for(i=1;i<20;i++) {
- float v, r1, r2;
- v = 5.0 / i;
- r1 = pow_m1_4(s, v);
- r2 = pow(v,-0.25);
- printf("%f^-0.25=%f e=%f\n", v, r1, r2 - r1);
- }
-#endif
-}
-
-/* NOTE: We use the same code as Vorbis here */
-/* XXX: optimize it further with SSE/3Dnow */
-static void wma_lsp_to_curve(WMADecodeContext *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(WMADecodeContext *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] = lsp_codebook[i][val];
- }
-
- wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
- s->block_len, lsp_coefs);
-}
-
-/* decode exponents coded with VLC codes */
-static int decode_exp_vlc(WMADecodeContext *s, int ch)
-{
- int last_exp, n, code;
- const uint16_t *ptr, *band_ptr;
- float v, *q, max_scale, *q_end;
-
- band_ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
- ptr = band_ptr;
- q = s->exponents[ch];
- q_end = q + s->block_len;
- max_scale = 0;
- if (s->version == 1) {
- last_exp = get_bits(&s->gb, 5) + 10;
- /* XXX: use a table */
- v = pow(10, last_exp * (1.0 / 16.0));
- max_scale = v;
- n = *ptr++;
- do {
- *q++ = v;
- } while (--n);
- }
- last_exp = 36;
- while (q < q_end) {
- code = get_vlc(&s->gb, &s->exp_vlc);
- if (code < 0)
- return -1;
- /* NOTE: this offset is the same as MPEG4 AAC ! */
- last_exp += code - 60;
- /* XXX: use a table */
- v = pow(10, last_exp * (1.0 / 16.0));
- if (v > max_scale)
- max_scale = v;
- n = *ptr++;
- do {
- *q++ = v;
- } while (--n);
- }
- s->max_exponent[ch] = max_scale;
- return 0;
-}
-
-/* return 0 if OK. return 1 if last block of frame. return -1 if
- unrecorrable error. */
-static int wma_decode_block(WMADecodeContext *s)
-{
- int n, v, a, ch, code, bsize;
- int coef_nb_bits, total_gain, parse_exponents;
- float window[BLOCK_MAX_SIZE * 2];
- int nb_coefs[MAX_CHANNELS];
- float mdct_norm;
-
-#ifdef TRACE
- tprintf("***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)
- return -1;
- s->prev_block_len_bits = s->frame_len_bits - v;
- v = get_bits(&s->gb, n);
- if (v >= s->nb_block_sizes)
- 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)
- 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;
- }
-
- /* 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)
- return -1;
-
- if (s->nb_channels == 2) {
- s->ms_stereo = get_bits(&s->gb, 1);
- }
- v = 0;
- for(ch = 0; ch < s->nb_channels; ch++) {
- a = get_bits(&s->gb, 1);
- s->channel_coded[ch] = a;
- v |= a;
- }
- /* if no channel coded, no need to go further */
- /* XXX: fix potential framing problems */
- if (!v)
- goto next;
-
- bsize = s->frame_len_bits - s->block_len_bits;
-
- /* 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;
- }
-
- if (total_gain < 15)
- coef_nb_bits = 13;
- else if (total_gain < 32)
- coef_nb_bits = 12;
- else if (total_gain < 40)
- coef_nb_bits = 11;
- else if (total_gain < 45)
- coef_nb_bits = 10;
- else
- coef_nb_bits = 9;
-
- /* compute number of coefficients */
- n = s->coefs_end[bsize] - s->coefs_start;
- for(ch = 0; ch < s->nb_channels; ch++)
- nb_coefs[ch] = n;
-
- /* complex coding */
- if (s->use_noise_coding) {
-
- for(ch = 0; ch < s->nb_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_bits(&s->gb, 1);
- 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->nb_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_vlc(&s->gb, &s->hgain_vlc);
- if (code < 0)
- return -1;
- val += code - 18;
- }
- s->high_band_values[ch][i] = val;
- }
- }
- }
- }
- }
-
- /* exposant can be interpolated in short blocks. */
- parse_exponents = 1;
- if (s->block_len_bits != s->frame_len_bits) {
- parse_exponents = get_bits(&s->gb, 1);
- }
-
- if (parse_exponents) {
- for(ch = 0; ch < s->nb_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);
- }
- }
- }
- } else {
- for(ch = 0; ch < s->nb_channels; ch++) {
- if (s->channel_coded[ch]) {
- interpolate_array(s->exponents[ch], 1 << s->prev_block_len_bits,
- s->block_len);
- }
- }
- }
-
- /* parse spectral coefficients : just RLE encoding */
- for(ch = 0; ch < s->nb_channels; ch++) {
- if (s->channel_coded[ch]) {
- VLC *coef_vlc;
- int level, run, sign, tindex;
- int16_t *ptr, *eptr;
- const int16_t *level_table, *run_table;
-
- /* special VLC tables are used for ms stereo because
- there is potentially less energy there */
- tindex = (ch == 1 && s->ms_stereo);
- coef_vlc = &s->coef_vlc[tindex];
- run_table = s->run_table[tindex];
- level_table = s->level_table[tindex];
- /* XXX: optimize */
- ptr = &s->coefs1[ch][0];
- eptr = ptr + nb_coefs[ch];
- memset(ptr, 0, s->block_len * sizeof(int16_t));
- for(;;) {
- code = get_vlc(&s->gb, coef_vlc);
- if (code < 0)
- return -1;
- if (code == 1) {
- /* EOB */
- break;
- } else if (code == 0) {
- /* escape */
- level = get_bits(&s->gb, coef_nb_bits);
- /* NOTE: this is rather suboptimal. reading
- block_len_bits would be better */
- run = get_bits(&s->gb, s->frame_len_bits);
- } else {
- /* normal code */
- run = run_table[code];
- level = level_table[code];
- }
- sign = get_bits(&s->gb, 1);
- if (!sign)
- level = -level;
- ptr += run;
- if (ptr >= eptr)
- return -1;
- *ptr++ = level;
- /* NOTE: EOB can be omitted */
- if (ptr >= eptr)
- break;
- }
- }
- if (s->version == 1 && s->nb_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->nb_channels; ch++) {
- if (s->channel_coded[ch]) {
- int16_t *coefs1;
- float *coefs, *exponents, mult, mult1, noise, *exp_ptr;
- int i, j, n, n1, last_high_band;
- float exp_power[HIGH_BAND_MAX_SIZE];
-
- coefs1 = s->coefs1[ch];
- exponents = s->exponents[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++) * mult1;
- s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
- }
-
- n1 = s->exponent_high_sizes[bsize];
-
- /* compute power of high bands */
- exp_ptr = exponents +
- s->high_band_start[bsize] -
- s->coefs_start;
- 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 = exp_ptr[i];
- e2 += v * v;
- }
- exp_power[j] = e2 / n;
- last_high_band = j;
- tprintf("%d: power=%f (%d)\n", j, exp_power[j], n);
- }
- exp_ptr += n;
- }
-
- /* main freqs and high freqs */
- 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++ = (*exponents++) * noise * mult1;
- }
- } 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++) * mult;
- }
- }
- }
-
- /* very high freqs : noise */
- n = s->block_len - s->coefs_end[bsize];
- mult1 = mult * exponents[-1];
- 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] * 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->nb_channels; ch++) {
- if (s->channel_coded[ch]) {
- dump_floats("exponents", 3, s->exponents[ch], s->block_len);
- dump_floats("coefs", 1, s->coefs[ch], s->block_len);
- }
- }
-#endif
-
- if (s->ms_stereo && s->channel_coded[1]) {
- float a, b;
- int i;
-
- /* 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("rare ms-stereo case happened\n");
- memset(s->coefs[0], 0, sizeof(float) * s->block_len);
- s->channel_coded[0] = 1;
- }
-
- for(i = 0; i < s->block_len; i++) {
- a = s->coefs[0][i];
- b = s->coefs[1][i];
- s->coefs[0][i] = a + b;
- s->coefs[1][i] = a - b;
- }
- }
-
- /* build the window : we ensure that when the windows overlap
- their squared sum is always 1 (MDCT reconstruction rule) */
- /* XXX: merge with output */
- {
- int i, next_block_len, block_len, prev_block_len, n;
- float *wptr;
-
- block_len = s->block_len;
- prev_block_len = 1 << s->prev_block_len_bits;
- next_block_len = 1 << s->next_block_len_bits;
-
- /* right part */
- wptr = window + block_len;
- if (block_len <= next_block_len) {
- for(i=0;i<block_len;i++)
- *wptr++ = s->windows[bsize][i];
- } else {
- /* overlap */
- n = (block_len / 2) - (next_block_len / 2);
- for(i=0;i<n;i++)
- *wptr++ = 1.0;
- for(i=0;i<next_block_len;i++)
- *wptr++ = s->windows[s->frame_len_bits - s->next_block_len_bits][i];
- for(i=0;i<n;i++)
- *wptr++ = 0.0;
- }
-
- /* left part */
- wptr = window + block_len;
- if (block_len <= prev_block_len) {
- for(i=0;i<block_len;i++)
- *--wptr = s->windows[bsize][i];
- } else {
- /* overlap */
- n = (block_len / 2) - (prev_block_len / 2);
- for(i=0;i<n;i++)
- *--wptr = 1.0;
- for(i=0;i<prev_block_len;i++)
- *--wptr = s->windows[s->frame_len_bits - s->prev_block_len_bits][i];
- for(i=0;i<n;i++)
- *--wptr = 0.0;
- }
- }
-
-
- for(ch = 0; ch < s->nb_channels; ch++) {
- if (s->channel_coded[ch]) {
- FFTSample output[BLOCK_MAX_SIZE * 2] __attribute__((aligned(16)));
- float *ptr;
- int i, n4, index, n;
-
- n = s->block_len;
- n4 = s->block_len / 2;
- ff_imdct_calc(&s->mdct_ctx[bsize],
- output, s->coefs[ch], s->mdct_tmp);
-
- /* XXX: optimize all that by build the window and
- multipying/adding at the same time */
- /* multiply by the window */
- for(i=0;i<n * 2;i++) {
- output[i] *= window[i];
- }
-
- /* add in the frame */
- index = (s->frame_len / 2) + s->block_pos - n4;
- ptr = &s->frame_out[ch][index];
- for(i=0;i<n * 2;i++) {
- *ptr += output[i];
- ptr++;
- }
-
- /* specific fast case for ms-stereo : add to second
- channel if it is not coded */
- if (s->ms_stereo && !s->channel_coded[1]) {
- ptr = &s->frame_out[1][index];
- for(i=0;i<n * 2;i++) {
- *ptr += output[i];
- ptr++;
- }
- }
- }
- }
- next:
- /* 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(WMADecodeContext *s, int16_t *samples)
-{
- int ret, i, n, a, ch, incr;
- int16_t *ptr;
- float *iptr;
-
-#ifdef TRACE
- tprintf("***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;
- }
-
- /* convert frame to integer */
- n = s->frame_len;
- incr = s->nb_channels;
- for(ch = 0; ch < s->nb_channels; ch++) {
- ptr = samples + ch;
- iptr = s->frame_out[ch];
-
- for(i=0;i<n;i++) {
- a = lrintf(*iptr++);
- if (a > 32767)
- a = 32767;
- else if (a < -32768)
- a = -32768;
- *ptr = a;
- ptr += incr;
- }
- /* prepare for next block */
- memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
- s->frame_len * sizeof(float));
- /* XXX: suppress this */
- memset(&s->frame_out[ch][s->frame_len], 0,
- s->frame_len * sizeof(float));
- }
-
-#ifdef TRACE
- dump_shorts("samples", samples, n * s->nb_channels);
-#endif
- return 0;
-}
-
-static int wma_decode_superframe(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- WMADecodeContext *s = avctx->priv_data;
- int nb_frames, bit_offset, i, pos, len;
- uint8_t *q;
- int16_t *samples;
-
- tprintf("***decode_superframe:\n");
-
- samples = data;
-
- init_get_bits(&s->gb, buf, buf_size*8);
-
- if (s->use_bit_reservoir) {
- /* read super frame header */
- get_bits(&s->gb, 4); /* super frame index */
- nb_frames = get_bits(&s->gb, 4) - 1;
-
- bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
-
- if (s->last_superframe_len > 0) {
- // printf("skip=%d\n", s->last_bitoffset);
- /* 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 > 0) {
- *q++ = (get_bits)(&s->gb, 8);
- len -= 8;
- }
- if (len > 0) {
- *q++ = (get_bits)(&s->gb, len) << (8 - len);
- }
-
- /* XXX: bit_offset bits into last frame */
- init_get_bits(&s->gb, s->last_superframe, MAX_CODED_SUPERFRAME_SIZE*8);
- /* 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) < 0)
- goto fail;
- samples += s->nb_channels * s->frame_len;
- }
-
- /* read each frame starting from bit_offset */
- pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
- init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_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) < 0)
- goto fail;
- samples += s->nb_channels * 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) {
- goto fail;
- }
- s->last_superframe_len = len;
- memcpy(s->last_superframe, buf + pos, len);
- } else {
- /* single frame decode */
- if (wma_decode_frame(s, samples) < 0)
- goto fail;
- samples += s->nb_channels * s->frame_len;
- }
- *data_size = (int8_t *)samples - (int8_t *)data;
- return s->block_align;
- fail:
- /* when error, we reset the bit reservoir */
- s->last_superframe_len = 0;
- return -1;
-}
-
-static int wma_decode_end(AVCodecContext *avctx)
-{
- WMADecodeContext *s = avctx->priv_data;
- int i;
-
- for(i = 0; i < s->nb_block_sizes; i++)
- ff_mdct_end(&s->mdct_ctx[i]);
- for(i = 0; i < s->nb_block_sizes; i++)
- av_free(s->windows[i]);
-
- if (s->use_exp_vlc) {
- free_vlc(&s->exp_vlc);
- }
- if (s->use_noise_coding) {
- free_vlc(&s->hgain_vlc);
- }
- for(i = 0;i < 2; i++) {
- free_vlc(&s->coef_vlc[i]);
- av_free(s->run_table[i]);
- av_free(s->level_table[i]);
- }
-
- return 0;
-}
-
-AVCodec wmav1_decoder =
-{
- "wmav1",
- CODEC_TYPE_AUDIO,
- CODEC_ID_WMAV1,
- sizeof(WMADecodeContext),
- wma_decode_init,
- NULL,
- wma_decode_end,
- wma_decode_superframe,
-};
-
-AVCodec wmav2_decoder =
-{
- "wmav2",
- CODEC_TYPE_AUDIO,
- CODEC_ID_WMAV2,
- sizeof(WMADecodeContext),
- wma_decode_init,
- NULL,
- wma_decode_end,
- wma_decode_superframe,
-};
projects / synfig.git / blobdiff