X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;ds=sidebyside;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=0000000000000000000000000000000000000000;hb=6fa8f2f38d4b0b35f8539bf94e27ae27015c7689;hp=15b15f23f0190a0713ac9fbfdc7f02b48fd4e326;hpb=47fce282611fbba1044921d22ca887f9b53ad91a;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 deleted file mode 100644 index 15b15f2..0000000 --- a/synfig-core/tags/synfig_0_61_03/synfig-core/src/modules/mod_libavcodec/libavcodec/wmadec.c +++ /dev/null @@ -1,1314 +0,0 @@ -/* - * 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, -};