diff options
Diffstat (limited to 'ffmpeg1/libavcodec/wmadec.c')
| -rw-r--r-- | ffmpeg1/libavcodec/wmadec.c | 974 |
1 files changed, 0 insertions, 974 deletions
diff --git a/ffmpeg1/libavcodec/wmadec.c b/ffmpeg1/libavcodec/wmadec.c deleted file mode 100644 index 0648c1e..0000000 --- a/ffmpeg1/libavcodec/wmadec.c +++ /dev/null @@ -1,974 +0,0 @@ -/* - * WMA compatible decoder - * Copyright (c) 2002 The FFmpeg Project - * - * This file is part of FFmpeg. - * - * FFmpeg is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * FFmpeg is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * WMA compatible decoder. - * This decoder handles Microsoft Windows Media Audio data, versions 1 & 2. - * WMA v1 is identified by audio format 0x160 in Microsoft media files - * (ASF/AVI/WAV). WMA v2 is identified by audio format 0x161. - * - * To use this decoder, a calling application must supply the extra data - * bytes provided with the WMA data. These are the extra, codec-specific - * bytes at the end of a WAVEFORMATEX data structure. Transmit these bytes - * to the decoder using the extradata[_size] fields in AVCodecContext. There - * should be 4 extra bytes for v1 data and 6 extra bytes for v2 data. - */ - -#include "avcodec.h" -#include "internal.h" -#include "wma.h" - -#undef NDEBUG -#include <assert.h> - -#define EXPVLCBITS 8 -#define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS) - -#define HGAINVLCBITS 9 -#define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS) - -static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len); - -#ifdef TRACE -static void dump_floats(WMACodecContext *s, const char *name, int prec, const float *tab, int n) -{ - int i; - - tprintf(s->avctx, "%s[%d]:\n", name, n); - for(i=0;i<n;i++) { - if ((i & 7) == 0) - tprintf(s->avctx, "%4d: ", i); - tprintf(s->avctx, " %8.*f", prec, tab[i]); - if ((i & 7) == 7) - tprintf(s->avctx, "\n"); - } - if ((i & 7) != 0) - tprintf(s->avctx, "\n"); -} -#endif - -static int wma_decode_init(AVCodecContext * avctx) -{ - WMACodecContext *s = avctx->priv_data; - int i, flags2; - uint8_t *extradata; - - if (!avctx->block_align) { - av_log(avctx, AV_LOG_ERROR, "block_align is not set\n"); - return AVERROR(EINVAL); - } - - s->avctx = avctx; - - /* extract flag infos */ - flags2 = 0; - extradata = avctx->extradata; - if (avctx->codec->id == AV_CODEC_ID_WMAV1 && avctx->extradata_size >= 4) { - flags2 = AV_RL16(extradata+2); - } else if (avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 6) { - flags2 = AV_RL16(extradata+4); - } - - s->use_exp_vlc = flags2 & 0x0001; - s->use_bit_reservoir = flags2 & 0x0002; - s->use_variable_block_len = flags2 & 0x0004; - - if(avctx->codec->id == AV_CODEC_ID_WMAV2 && avctx->extradata_size >= 8){ - if(AV_RL16(extradata+4)==0xd && s->use_variable_block_len){ - av_log(avctx, AV_LOG_WARNING, "Disabling use_variable_block_len, if this fails contact the ffmpeg developers and send us the file\n"); - s->use_variable_block_len= 0; // this fixes issue1503 - } - } - - if(ff_wma_init(avctx, flags2)<0) - return -1; - - /* init MDCT */ - for(i = 0; i < s->nb_block_sizes; i++) - ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1, 1.0 / 32768.0); - - if (s->use_noise_coding) { - init_vlc(&s->hgain_vlc, HGAINVLCBITS, sizeof(ff_wma_hgain_huffbits), - ff_wma_hgain_huffbits, 1, 1, - ff_wma_hgain_huffcodes, 2, 2, 0); - } - - if (s->use_exp_vlc) { - init_vlc(&s->exp_vlc, EXPVLCBITS, sizeof(ff_aac_scalefactor_bits), //FIXME move out of context - ff_aac_scalefactor_bits, 1, 1, - ff_aac_scalefactor_code, 4, 4, 0); - } else { - wma_lsp_to_curve_init(s, s->frame_len); - } - - avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; - - return 0; -} - -/** - * compute x^-0.25 with an exponent and mantissa table. We use linear - * interpolation to reduce the mantissa table size at a small speed - * expense (linear interpolation approximately doubles the number of - * bits of precision). - */ -static inline float pow_m1_4(WMACodecContext *s, float x) -{ - union { - float f; - unsigned int v; - } u, t; - unsigned int e, m; - float a, b; - - u.f = x; - e = u.v >> 23; - m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1); - /* build interpolation scale: 1 <= t < 2. */ - t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23); - a = s->lsp_pow_m_table1[m]; - b = s->lsp_pow_m_table2[m]; - return s->lsp_pow_e_table[e] * (a + b * t.f); -} - -static void wma_lsp_to_curve_init(WMACodecContext *s, int frame_len) -{ - float wdel, a, b; - int i, e, m; - - wdel = M_PI / frame_len; - for(i=0;i<frame_len;i++) - s->lsp_cos_table[i] = 2.0f * cos(wdel * i); - - /* tables for x^-0.25 computation */ - for(i=0;i<256;i++) { - e = i - 126; - s->lsp_pow_e_table[i] = pow(2.0, e * -0.25); - } - - /* NOTE: these two tables are needed to avoid two operations in - pow_m1_4 */ - b = 1.0; - for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) { - m = (1 << LSP_POW_BITS) + i; - a = (float)m * (0.5 / (1 << LSP_POW_BITS)); - a = pow(a, -0.25); - s->lsp_pow_m_table1[i] = 2 * a - b; - s->lsp_pow_m_table2[i] = b - a; - b = a; - } -} - -/** - * NOTE: We use the same code as Vorbis here - * @todo optimize it further with SSE/3Dnow - */ -static void wma_lsp_to_curve(WMACodecContext *s, - float *out, float *val_max_ptr, - int n, float *lsp) -{ - int i, j; - float p, q, w, v, val_max; - - val_max = 0; - for(i=0;i<n;i++) { - p = 0.5f; - q = 0.5f; - w = s->lsp_cos_table[i]; - for(j=1;j<NB_LSP_COEFS;j+=2){ - q *= w - lsp[j - 1]; - p *= w - lsp[j]; - } - p *= p * (2.0f - w); - q *= q * (2.0f + w); - v = p + q; - v = pow_m1_4(s, v); - if (v > val_max) - val_max = v; - out[i] = v; - } - *val_max_ptr = val_max; -} - -/** - * decode exponents coded with LSP coefficients (same idea as Vorbis) - */ -static void decode_exp_lsp(WMACodecContext *s, int ch) -{ - float lsp_coefs[NB_LSP_COEFS]; - int val, i; - - for(i = 0; i < NB_LSP_COEFS; i++) { - if (i == 0 || i >= 8) - val = get_bits(&s->gb, 3); - else - val = get_bits(&s->gb, 4); - lsp_coefs[i] = ff_wma_lsp_codebook[i][val]; - } - - wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch], - s->block_len, lsp_coefs); -} - -/** pow(10, i / 16.0) for i in -60..95 */ -static const float pow_tab[] = { - 1.7782794100389e-04, 2.0535250264571e-04, - 2.3713737056617e-04, 2.7384196342644e-04, - 3.1622776601684e-04, 3.6517412725484e-04, - 4.2169650342858e-04, 4.8696752516586e-04, - 5.6234132519035e-04, 6.4938163157621e-04, - 7.4989420933246e-04, 8.6596432336006e-04, - 1.0000000000000e-03, 1.1547819846895e-03, - 1.3335214321633e-03, 1.5399265260595e-03, - 1.7782794100389e-03, 2.0535250264571e-03, - 2.3713737056617e-03, 2.7384196342644e-03, - 3.1622776601684e-03, 3.6517412725484e-03, - 4.2169650342858e-03, 4.8696752516586e-03, - 5.6234132519035e-03, 6.4938163157621e-03, - 7.4989420933246e-03, 8.6596432336006e-03, - 1.0000000000000e-02, 1.1547819846895e-02, - 1.3335214321633e-02, 1.5399265260595e-02, - 1.7782794100389e-02, 2.0535250264571e-02, - 2.3713737056617e-02, 2.7384196342644e-02, - 3.1622776601684e-02, 3.6517412725484e-02, - 4.2169650342858e-02, 4.8696752516586e-02, - 5.6234132519035e-02, 6.4938163157621e-02, - 7.4989420933246e-02, 8.6596432336007e-02, - 1.0000000000000e-01, 1.1547819846895e-01, - 1.3335214321633e-01, 1.5399265260595e-01, - 1.7782794100389e-01, 2.0535250264571e-01, - 2.3713737056617e-01, 2.7384196342644e-01, - 3.1622776601684e-01, 3.6517412725484e-01, - 4.2169650342858e-01, 4.8696752516586e-01, - 5.6234132519035e-01, 6.4938163157621e-01, - 7.4989420933246e-01, 8.6596432336007e-01, - 1.0000000000000e+00, 1.1547819846895e+00, - 1.3335214321633e+00, 1.5399265260595e+00, - 1.7782794100389e+00, 2.0535250264571e+00, - 2.3713737056617e+00, 2.7384196342644e+00, - 3.1622776601684e+00, 3.6517412725484e+00, - 4.2169650342858e+00, 4.8696752516586e+00, - 5.6234132519035e+00, 6.4938163157621e+00, - 7.4989420933246e+00, 8.6596432336007e+00, - 1.0000000000000e+01, 1.1547819846895e+01, - 1.3335214321633e+01, 1.5399265260595e+01, - 1.7782794100389e+01, 2.0535250264571e+01, - 2.3713737056617e+01, 2.7384196342644e+01, - 3.1622776601684e+01, 3.6517412725484e+01, - 4.2169650342858e+01, 4.8696752516586e+01, - 5.6234132519035e+01, 6.4938163157621e+01, - 7.4989420933246e+01, 8.6596432336007e+01, - 1.0000000000000e+02, 1.1547819846895e+02, - 1.3335214321633e+02, 1.5399265260595e+02, - 1.7782794100389e+02, 2.0535250264571e+02, - 2.3713737056617e+02, 2.7384196342644e+02, - 3.1622776601684e+02, 3.6517412725484e+02, - 4.2169650342858e+02, 4.8696752516586e+02, - 5.6234132519035e+02, 6.4938163157621e+02, - 7.4989420933246e+02, 8.6596432336007e+02, - 1.0000000000000e+03, 1.1547819846895e+03, - 1.3335214321633e+03, 1.5399265260595e+03, - 1.7782794100389e+03, 2.0535250264571e+03, - 2.3713737056617e+03, 2.7384196342644e+03, - 3.1622776601684e+03, 3.6517412725484e+03, - 4.2169650342858e+03, 4.8696752516586e+03, - 5.6234132519035e+03, 6.4938163157621e+03, - 7.4989420933246e+03, 8.6596432336007e+03, - 1.0000000000000e+04, 1.1547819846895e+04, - 1.3335214321633e+04, 1.5399265260595e+04, - 1.7782794100389e+04, 2.0535250264571e+04, - 2.3713737056617e+04, 2.7384196342644e+04, - 3.1622776601684e+04, 3.6517412725484e+04, - 4.2169650342858e+04, 4.8696752516586e+04, - 5.6234132519035e+04, 6.4938163157621e+04, - 7.4989420933246e+04, 8.6596432336007e+04, - 1.0000000000000e+05, 1.1547819846895e+05, - 1.3335214321633e+05, 1.5399265260595e+05, - 1.7782794100389e+05, 2.0535250264571e+05, - 2.3713737056617e+05, 2.7384196342644e+05, - 3.1622776601684e+05, 3.6517412725484e+05, - 4.2169650342858e+05, 4.8696752516586e+05, - 5.6234132519035e+05, 6.4938163157621e+05, - 7.4989420933246e+05, 8.6596432336007e+05, -}; - -/** - * decode exponents coded with VLC codes - */ -static int decode_exp_vlc(WMACodecContext *s, int ch) -{ - int last_exp, n, code; - const uint16_t *ptr; - float v, max_scale; - uint32_t *q, *q_end, iv; - const float *ptab = pow_tab + 60; - const uint32_t *iptab = (const uint32_t*)ptab; - - ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits]; - q = (uint32_t *)s->exponents[ch]; - q_end = q + s->block_len; - max_scale = 0; - if (s->version == 1) { - last_exp = get_bits(&s->gb, 5) + 10; - v = ptab[last_exp]; - iv = iptab[last_exp]; - max_scale = v; - n = *ptr++; - switch (n & 3) do { - case 0: *q++ = iv; - case 3: *q++ = iv; - case 2: *q++ = iv; - case 1: *q++ = iv; - } while ((n -= 4) > 0); - }else - last_exp = 36; - - while (q < q_end) { - code = get_vlc2(&s->gb, s->exp_vlc.table, EXPVLCBITS, EXPMAX); - if (code < 0){ - av_log(s->avctx, AV_LOG_ERROR, "Exponent vlc invalid\n"); - return -1; - } - /* NOTE: this offset is the same as MPEG4 AAC ! */ - last_exp += code - 60; - if ((unsigned)last_exp + 60 >= FF_ARRAY_ELEMS(pow_tab)) { - av_log(s->avctx, AV_LOG_ERROR, "Exponent out of range: %d\n", - last_exp); - return -1; - } - v = ptab[last_exp]; - iv = iptab[last_exp]; - if (v > max_scale) - max_scale = v; - n = *ptr++; - switch (n & 3) do { - case 0: *q++ = iv; - case 3: *q++ = iv; - case 2: *q++ = iv; - case 1: *q++ = iv; - } while ((n -= 4) > 0); - } - s->max_exponent[ch] = max_scale; - return 0; -} - - -/** - * Apply MDCT window and add into output. - * - * We ensure that when the windows overlap their squared sum - * is always 1 (MDCT reconstruction rule). - */ -static void wma_window(WMACodecContext *s, float *out) -{ - float *in = s->output; - int block_len, bsize, n; - - /* left part */ - if (s->block_len_bits <= s->prev_block_len_bits) { - block_len = s->block_len; - bsize = s->frame_len_bits - s->block_len_bits; - - s->fdsp.vector_fmul_add(out, in, s->windows[bsize], - out, block_len); - - } else { - block_len = 1 << s->prev_block_len_bits; - n = (s->block_len - block_len) / 2; - bsize = s->frame_len_bits - s->prev_block_len_bits; - - s->fdsp.vector_fmul_add(out+n, in+n, s->windows[bsize], - out+n, block_len); - - memcpy(out+n+block_len, in+n+block_len, n*sizeof(float)); - } - - out += s->block_len; - in += s->block_len; - - /* right part */ - if (s->block_len_bits <= s->next_block_len_bits) { - block_len = s->block_len; - bsize = s->frame_len_bits - s->block_len_bits; - - s->fdsp.vector_fmul_reverse(out, in, s->windows[bsize], block_len); - - } else { - block_len = 1 << s->next_block_len_bits; - n = (s->block_len - block_len) / 2; - bsize = s->frame_len_bits - s->next_block_len_bits; - - memcpy(out, in, n*sizeof(float)); - - s->fdsp.vector_fmul_reverse(out+n, in+n, s->windows[bsize], block_len); - - memset(out+n+block_len, 0, n*sizeof(float)); - } -} - - -/** - * @return 0 if OK. 1 if last block of frame. return -1 if - * unrecorrable error. - */ -static int wma_decode_block(WMACodecContext *s) -{ - int n, v, a, ch, bsize; - int coef_nb_bits, total_gain; - int nb_coefs[MAX_CHANNELS]; - float mdct_norm; - FFTContext *mdct; - -#ifdef TRACE - tprintf(s->avctx, "***decode_block: %d:%d\n", s->frame_count - 1, s->block_num); -#endif - - /* compute current block length */ - if (s->use_variable_block_len) { - n = av_log2(s->nb_block_sizes - 1) + 1; - - if (s->reset_block_lengths) { - s->reset_block_lengths = 0; - v = get_bits(&s->gb, n); - if (v >= s->nb_block_sizes){ - av_log(s->avctx, AV_LOG_ERROR, "prev_block_len_bits %d out of range\n", s->frame_len_bits - v); - return -1; - } - s->prev_block_len_bits = s->frame_len_bits - v; - v = get_bits(&s->gb, n); - if (v >= s->nb_block_sizes){ - av_log(s->avctx, AV_LOG_ERROR, "block_len_bits %d out of range\n", s->frame_len_bits - v); - return -1; - } - s->block_len_bits = s->frame_len_bits - v; - } else { - /* update block lengths */ - s->prev_block_len_bits = s->block_len_bits; - s->block_len_bits = s->next_block_len_bits; - } - v = get_bits(&s->gb, n); - if (v >= s->nb_block_sizes){ - av_log(s->avctx, AV_LOG_ERROR, "next_block_len_bits %d out of range\n", s->frame_len_bits - v); - return -1; - } - s->next_block_len_bits = s->frame_len_bits - v; - } else { - /* fixed block len */ - s->next_block_len_bits = s->frame_len_bits; - s->prev_block_len_bits = s->frame_len_bits; - s->block_len_bits = s->frame_len_bits; - } - - if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){ - av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n"); - return -1; - } - - /* now check if the block length is coherent with the frame length */ - s->block_len = 1 << s->block_len_bits; - if ((s->block_pos + s->block_len) > s->frame_len){ - av_log(s->avctx, AV_LOG_ERROR, "frame_len overflow\n"); - return -1; - } - - if (s->avctx->channels == 2) { - s->ms_stereo = get_bits1(&s->gb); - } - v = 0; - for(ch = 0; ch < s->avctx->channels; ch++) { - a = get_bits1(&s->gb); - s->channel_coded[ch] = a; - v |= a; - } - - bsize = s->frame_len_bits - s->block_len_bits; - - /* if no channel coded, no need to go further */ - /* XXX: fix potential framing problems */ - if (!v) - goto next; - - /* read total gain and extract corresponding number of bits for - coef escape coding */ - total_gain = 1; - for(;;) { - a = get_bits(&s->gb, 7); - total_gain += a; - if (a != 127) - break; - } - - coef_nb_bits= ff_wma_total_gain_to_bits(total_gain); - - /* compute number of coefficients */ - n = s->coefs_end[bsize] - s->coefs_start; - for(ch = 0; ch < s->avctx->channels; ch++) - nb_coefs[ch] = n; - - /* complex coding */ - if (s->use_noise_coding) { - - for(ch = 0; ch < s->avctx->channels; ch++) { - if (s->channel_coded[ch]) { - int i, n, a; - n = s->exponent_high_sizes[bsize]; - for(i=0;i<n;i++) { - a = get_bits1(&s->gb); - s->high_band_coded[ch][i] = a; - /* if noise coding, the coefficients are not transmitted */ - if (a) - nb_coefs[ch] -= s->exponent_high_bands[bsize][i]; - } - } - } - for(ch = 0; ch < s->avctx->channels; ch++) { - if (s->channel_coded[ch]) { - int i, n, val, code; - - n = s->exponent_high_sizes[bsize]; - val = (int)0x80000000; - for(i=0;i<n;i++) { - if (s->high_band_coded[ch][i]) { - if (val == (int)0x80000000) { - val = get_bits(&s->gb, 7) - 19; - } else { - code = get_vlc2(&s->gb, s->hgain_vlc.table, HGAINVLCBITS, HGAINMAX); - if (code < 0){ - av_log(s->avctx, AV_LOG_ERROR, "hgain vlc invalid\n"); - return -1; - } - val += code - 18; - } - s->high_band_values[ch][i] = val; - } - } - } - } - } - - /* exponents can be reused in short blocks. */ - if ((s->block_len_bits == s->frame_len_bits) || - get_bits1(&s->gb)) { - for(ch = 0; ch < s->avctx->channels; ch++) { - if (s->channel_coded[ch]) { - if (s->use_exp_vlc) { - if (decode_exp_vlc(s, ch) < 0) - return -1; - } else { - decode_exp_lsp(s, ch); - } - s->exponents_bsize[ch] = bsize; - } - } - } - - /* parse spectral coefficients : just RLE encoding */ - for (ch = 0; ch < s->avctx->channels; ch++) { - if (s->channel_coded[ch]) { - int tindex; - WMACoef* ptr = &s->coefs1[ch][0]; - - /* special VLC tables are used for ms stereo because - there is potentially less energy there */ - tindex = (ch == 1 && s->ms_stereo); - memset(ptr, 0, s->block_len * sizeof(WMACoef)); - ff_wma_run_level_decode(s->avctx, &s->gb, &s->coef_vlc[tindex], - s->level_table[tindex], s->run_table[tindex], - 0, ptr, 0, nb_coefs[ch], - s->block_len, s->frame_len_bits, coef_nb_bits); - } - if (s->version == 1 && s->avctx->channels >= 2) { - align_get_bits(&s->gb); - } - } - - /* normalize */ - { - int n4 = s->block_len / 2; - mdct_norm = 1.0 / (float)n4; - if (s->version == 1) { - mdct_norm *= sqrt(n4); - } - } - - /* finally compute the MDCT coefficients */ - for (ch = 0; ch < s->avctx->channels; ch++) { - if (s->channel_coded[ch]) { - WMACoef *coefs1; - float *coefs, *exponents, mult, mult1, noise; - int i, j, n, n1, last_high_band, esize; - float exp_power[HIGH_BAND_MAX_SIZE]; - - coefs1 = s->coefs1[ch]; - exponents = s->exponents[ch]; - esize = s->exponents_bsize[ch]; - mult = pow(10, total_gain * 0.05) / s->max_exponent[ch]; - mult *= mdct_norm; - coefs = s->coefs[ch]; - if (s->use_noise_coding) { - mult1 = mult; - /* very low freqs : noise */ - for(i = 0;i < s->coefs_start; i++) { - *coefs++ = s->noise_table[s->noise_index] * - exponents[i<<bsize>>esize] * mult1; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - } - - n1 = s->exponent_high_sizes[bsize]; - - /* compute power of high bands */ - exponents = s->exponents[ch] + - (s->high_band_start[bsize]<<bsize>>esize); - last_high_band = 0; /* avoid warning */ - for(j=0;j<n1;j++) { - n = s->exponent_high_bands[s->frame_len_bits - - s->block_len_bits][j]; - if (s->high_band_coded[ch][j]) { - float e2, v; - e2 = 0; - for(i = 0;i < n; i++) { - v = exponents[i<<bsize>>esize]; - e2 += v * v; - } - exp_power[j] = e2 / n; - last_high_band = j; - tprintf(s->avctx, "%d: power=%f (%d)\n", j, exp_power[j], n); - } - exponents += n<<bsize>>esize; - } - - /* main freqs and high freqs */ - exponents = s->exponents[ch] + (s->coefs_start<<bsize>>esize); - for(j=-1;j<n1;j++) { - if (j < 0) { - n = s->high_band_start[bsize] - - s->coefs_start; - } else { - n = s->exponent_high_bands[s->frame_len_bits - - s->block_len_bits][j]; - } - if (j >= 0 && s->high_band_coded[ch][j]) { - /* use noise with specified power */ - mult1 = sqrt(exp_power[j] / exp_power[last_high_band]); - /* XXX: use a table */ - mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05); - mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult); - mult1 *= mdct_norm; - for(i = 0;i < n; i++) { - noise = s->noise_table[s->noise_index]; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - *coefs++ = noise * - exponents[i<<bsize>>esize] * mult1; - } - exponents += n<<bsize>>esize; - } else { - /* coded values + small noise */ - for(i = 0;i < n; i++) { - noise = s->noise_table[s->noise_index]; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - *coefs++ = ((*coefs1++) + noise) * - exponents[i<<bsize>>esize] * mult; - } - exponents += n<<bsize>>esize; - } - } - - /* very high freqs : noise */ - n = s->block_len - s->coefs_end[bsize]; - mult1 = mult * exponents[((-1<<bsize))>>esize]; - for(i = 0; i < n; i++) { - *coefs++ = s->noise_table[s->noise_index] * mult1; - s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1); - } - } else { - /* XXX: optimize more */ - for(i = 0;i < s->coefs_start; i++) - *coefs++ = 0.0; - n = nb_coefs[ch]; - for(i = 0;i < n; i++) { - *coefs++ = coefs1[i] * exponents[i<<bsize>>esize] * mult; - } - n = s->block_len - s->coefs_end[bsize]; - for(i = 0;i < n; i++) - *coefs++ = 0.0; - } - } - } - -#ifdef TRACE - for (ch = 0; ch < s->avctx->channels; ch++) { - if (s->channel_coded[ch]) { - dump_floats(s, "exponents", 3, s->exponents[ch], s->block_len); - dump_floats(s, "coefs", 1, s->coefs[ch], s->block_len); - } - } -#endif - - if (s->ms_stereo && s->channel_coded[1]) { - /* nominal case for ms stereo: we do it before mdct */ - /* no need to optimize this case because it should almost - never happen */ - if (!s->channel_coded[0]) { - tprintf(s->avctx, "rare ms-stereo case happened\n"); - memset(s->coefs[0], 0, sizeof(float) * s->block_len); - s->channel_coded[0] = 1; - } - - s->fdsp.butterflies_float(s->coefs[0], s->coefs[1], s->block_len); - } - -next: - mdct = &s->mdct_ctx[bsize]; - - for (ch = 0; ch < s->avctx->channels; ch++) { - int n4, index; - - n4 = s->block_len / 2; - if(s->channel_coded[ch]){ - mdct->imdct_calc(mdct, s->output, s->coefs[ch]); - }else if(!(s->ms_stereo && ch==1)) - memset(s->output, 0, sizeof(s->output)); - - /* multiply by the window and add in the frame */ - index = (s->frame_len / 2) + s->block_pos - n4; - wma_window(s, &s->frame_out[ch][index]); - } - - /* update block number */ - s->block_num++; - s->block_pos += s->block_len; - if (s->block_pos >= s->frame_len) - return 1; - else - return 0; -} - -/* decode a frame of frame_len samples */ -static int wma_decode_frame(WMACodecContext *s, float **samples, - int samples_offset) -{ - int ret, ch; - -#ifdef TRACE - tprintf(s->avctx, "***decode_frame: %d size=%d\n", s->frame_count++, s->frame_len); -#endif - - /* read each block */ - s->block_num = 0; - s->block_pos = 0; - for(;;) { - ret = wma_decode_block(s); - if (ret < 0) - return -1; - if (ret) - break; - } - - for (ch = 0; ch < s->avctx->channels; ch++) { - /* copy current block to output */ - memcpy(samples[ch] + samples_offset, s->frame_out[ch], - s->frame_len * sizeof(*s->frame_out[ch])); - /* prepare for next block */ - memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len], - s->frame_len * sizeof(*s->frame_out[ch])); - -#ifdef TRACE - dump_floats(s, "samples", 6, samples[ch] + samples_offset, s->frame_len); -#endif - } - - return 0; -} - -static int wma_decode_superframe(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - WMACodecContext *s = avctx->priv_data; - int nb_frames, bit_offset, i, pos, len, ret; - uint8_t *q; - float **samples; - int samples_offset; - - tprintf(avctx, "***decode_superframe:\n"); - - if(buf_size==0){ - s->last_superframe_len = 0; - return 0; - } - if (buf_size < avctx->block_align) { - av_log(avctx, AV_LOG_ERROR, - "Input packet size too small (%d < %d)\n", - buf_size, avctx->block_align); - return AVERROR_INVALIDDATA; - } - if(avctx->block_align) - buf_size = avctx->block_align; - - init_get_bits(&s->gb, buf, buf_size*8); - - if (s->use_bit_reservoir) { - /* read super frame header */ - skip_bits(&s->gb, 4); /* super frame index */ - nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0); - if (nb_frames <= 0) { - av_log(avctx, AV_LOG_ERROR, "nb_frames is %d\n", nb_frames); - return AVERROR_INVALIDDATA; - } - } else { - nb_frames = 1; - } - - /* get output buffer */ - frame->nb_samples = nb_frames * s->frame_len; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - samples = (float **)frame->extended_data; - samples_offset = 0; - - if (s->use_bit_reservoir) { - bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3); - if (bit_offset > get_bits_left(&s->gb)) { - av_log(avctx, AV_LOG_ERROR, - "Invalid last frame bit offset %d > buf size %d (%d)\n", - bit_offset, get_bits_left(&s->gb), buf_size); - goto fail; - } - - if (s->last_superframe_len > 0) { - /* add bit_offset bits to last frame */ - if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) > - MAX_CODED_SUPERFRAME_SIZE) - goto fail; - q = s->last_superframe + s->last_superframe_len; - len = bit_offset; - while (len > 7) { - *q++ = (get_bits)(&s->gb, 8); - len -= 8; - } - if (len > 0) { - *q++ = (get_bits)(&s->gb, len) << (8 - len); - } - memset(q, 0, FF_INPUT_BUFFER_PADDING_SIZE); - - /* XXX: bit_offset bits into last frame */ - init_get_bits(&s->gb, s->last_superframe, s->last_superframe_len * 8 + bit_offset); - /* skip unused bits */ - if (s->last_bitoffset > 0) - skip_bits(&s->gb, s->last_bitoffset); - /* this frame is stored in the last superframe and in the - current one */ - if (wma_decode_frame(s, samples, samples_offset) < 0) - goto fail; - samples_offset += s->frame_len; - nb_frames--; - } - - /* read each frame starting from bit_offset */ - pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3; - if (pos >= MAX_CODED_SUPERFRAME_SIZE * 8 || pos > buf_size * 8) - return AVERROR_INVALIDDATA; - init_get_bits(&s->gb, buf + (pos >> 3), (buf_size - (pos >> 3))*8); - len = pos & 7; - if (len > 0) - skip_bits(&s->gb, len); - - s->reset_block_lengths = 1; - for(i=0;i<nb_frames;i++) { - if (wma_decode_frame(s, samples, samples_offset) < 0) - goto fail; - samples_offset += s->frame_len; - } - - /* we copy the end of the frame in the last frame buffer */ - pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7); - s->last_bitoffset = pos & 7; - pos >>= 3; - len = buf_size - pos; - if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) { - av_log(s->avctx, AV_LOG_ERROR, "len %d invalid\n", len); - goto fail; - } - s->last_superframe_len = len; - memcpy(s->last_superframe, buf + pos, len); - } else { - /* single frame decode */ - if (wma_decode_frame(s, samples, samples_offset) < 0) - goto fail; - samples_offset += s->frame_len; - } - - av_dlog(s->avctx, "%d %d %d %d outbytes:%td eaten:%d\n", - s->frame_len_bits, s->block_len_bits, s->frame_len, s->block_len, - (int8_t *)samples - (int8_t *)data, avctx->block_align); - - *got_frame_ptr = 1; - - return buf_size; - fail: - /* when error, we reset the bit reservoir */ - s->last_superframe_len = 0; - return -1; -} - -static av_cold void flush(AVCodecContext *avctx) -{ - WMACodecContext *s = avctx->priv_data; - - s->last_bitoffset= - s->last_superframe_len= 0; -} - -#if CONFIG_WMAV1_DECODER -AVCodec ff_wmav1_decoder = { - .name = "wmav1", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_WMAV1, - .priv_data_size = sizeof(WMACodecContext), - .init = wma_decode_init, - .close = ff_wma_end, - .decode = wma_decode_superframe, - .flush = flush, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"), - .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, - AV_SAMPLE_FMT_NONE }, -}; -#endif -#if CONFIG_WMAV2_DECODER -AVCodec ff_wmav2_decoder = { - .name = "wmav2", - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_WMAV2, - .priv_data_size = sizeof(WMACodecContext), - .init = wma_decode_init, - .close = ff_wma_end, - .decode = wma_decode_superframe, - .flush = flush, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"), - .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, - AV_SAMPLE_FMT_NONE }, -}; -#endif |