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