| /* |
| * 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 "libavutil/attributes.h" |
| #include "libavutil/internal.h" |
| #include "libavutil/libm.h" |
| |
| #include "avcodec.h" |
| #include "internal.h" |
| #include "wma.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; |
| |
| ff_tlog(s->avctx, "%s[%d]:\n", name, n); |
| for (i = 0; i < n; i++) { |
| if ((i & 7) == 0) |
| ff_tlog(s->avctx, "%4d: ", i); |
| ff_tlog(s->avctx, " %8.*f", prec, tab[i]); |
| if ((i & 7) == 7) |
| ff_tlog(s->avctx, "\n"); |
| } |
| if ((i & 7) != 0) |
| ff_tlog(s->avctx, "\n"); |
| } |
| #endif /* TRACE */ |
| |
| static av_cold 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 |
| } |
| } |
| |
| for (i=0; i<MAX_CHANNELS; i++) |
| s->max_exponent[i] = 1.0; |
| |
| 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 av_cold 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] = exp2f(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 = 1/sqrt(sqrt(a)); |
| 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 |
| ff_tlog(s->avctx, "***decode_block: %d:%d\n", |
| s->frame_count - 1, s->block_num); |
| #endif /* TRACE */ |
| |
| /* 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 (;;) { |
| if (get_bits_left(&s->gb) < 7) { |
| av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| 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 = ff_exp10(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; |
| ff_tlog(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 * ff_exp10(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 /* TRACE */ |
| |
| 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]) { |
| ff_tlog(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 |
| ff_tlog(s->avctx, "***decode_frame: %d size=%d\n", |
| s->frame_count++, s->frame_len); |
| #endif /* TRACE */ |
| |
| /* 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 /* TRACE */ |
| } |
| |
| 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; |
| |
| ff_tlog(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) { |
| int is_error = nb_frames < 0 || get_bits_left(&s->gb) <= 8; |
| av_log(avctx, is_error ? AV_LOG_ERROR : AV_LOG_WARNING, |
| "nb_frames is %d bits left %d\n", |
| nb_frames, get_bits_left(&s->gb)); |
| if (is_error) |
| return AVERROR_INVALIDDATA; |
| |
| if ((s->last_superframe_len + buf_size - 1) > |
| MAX_CODED_SUPERFRAME_SIZE) |
| goto fail; |
| |
| q = s->last_superframe + s->last_superframe_len; |
| len = buf_size - 1; |
| while (len > 0) { |
| *q++ = get_bits (&s->gb, 8); |
| len --; |
| } |
| memset(q, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
| |
| s->last_superframe_len += 8*buf_size - 8; |
| // s->reset_block_lengths = 1; //XXX is this needed ? |
| *got_frame_ptr = 0; |
| return buf_size; |
| } |
| } 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, AV_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; |
| } |
| |
| ff_dlog(s->avctx, "%d %d %d %d outbytes:%"PTRDIFF_SPECIFIER" 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", |
| .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"), |
| .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 = AV_CODEC_CAP_DR1, |
| .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
| AV_SAMPLE_FMT_NONE }, |
| }; |
| #endif |
| #if CONFIG_WMAV2_DECODER |
| AVCodec ff_wmav2_decoder = { |
| .name = "wmav2", |
| .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"), |
| .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 = AV_CODEC_CAP_DR1, |
| .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, |
| AV_SAMPLE_FMT_NONE }, |
| }; |
| #endif |
