X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftags%2Fsynfig_0_61_03%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fwmadec.c;fp=synfig-core%2Ftags%2Fsynfig_0_61_03%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fwmadec.c;h=15b15f23f0190a0713ac9fbfdc7f02b48fd4e326;hb=2362dce2bb8c6a5fd5f3bd049975c3d89411f5d3;hp=0000000000000000000000000000000000000000;hpb=6f41e88a004056081fbf3e45c4eb9780cc08cd91;p=synfig.git diff --git a/synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_libavcodec/libavcodec/wmadec.c b/synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_libavcodec/libavcodec/wmadec.c new file mode 100644 index 0000000..15b15f2 --- /dev/null +++ b/synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_libavcodec/libavcodec/wmadec.c @@ -0,0 +1,1314 @@ +/* + * 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;in; + 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;jpriv_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;iexponent_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;iexponent_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;jexponent_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;jexponent_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;jwindows[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;inoise_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;inoise_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;ilsp_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;ilsp_cos_table[i]; + for(j=1;j 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;igb, 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;ihigh_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;jexponent_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;jhigh_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;iwindows[bsize][i]; + } else { + /* overlap */ + n = (block_len / 2) - (next_block_len / 2); + for(i=0;iwindows[s->frame_len_bits - s->next_block_len_bits][i]; + for(i=0;iwindows[bsize][i]; + } else { + /* overlap */ + n = (block_len / 2) - (prev_block_len / 2); + for(i=0;iwindows[s->frame_len_bits - s->prev_block_len_bits][i]; + for(i=0;inb_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;iframe_len / 2) + s->block_pos - n4; + ptr = &s->frame_out[ch][index]; + for(i=0;ims_stereo && !s->channel_coded[1]) { + ptr = &s->frame_out[1][index]; + for(i=0;iblock_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 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;inb_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, +};