yading@10: /* yading@10: * IMC compatible decoder yading@10: * Copyright (c) 2002-2004 Maxim Poliakovski yading@10: * Copyright (c) 2006 Benjamin Larsson yading@10: * Copyright (c) 2006 Konstantin Shishkov 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: * IMC - Intel Music Coder yading@10: * A mdct based codec using a 256 points large transform yading@10: * divided into 32 bands with some mix of scale factors. yading@10: * Only mono is supported. yading@10: * yading@10: */ yading@10: yading@10: yading@10: #include yading@10: #include yading@10: #include yading@10: yading@10: #include "libavutil/channel_layout.h" yading@10: #include "libavutil/float_dsp.h" yading@10: #include "libavutil/internal.h" yading@10: #include "libavutil/libm.h" yading@10: #include "avcodec.h" yading@10: #include "get_bits.h" yading@10: #include "dsputil.h" yading@10: #include "fft.h" yading@10: #include "internal.h" yading@10: #include "sinewin.h" yading@10: yading@10: #include "imcdata.h" yading@10: yading@10: #define IMC_BLOCK_SIZE 64 yading@10: #define IMC_FRAME_ID 0x21 yading@10: #define BANDS 32 yading@10: #define COEFFS 256 yading@10: yading@10: typedef struct IMCChannel { yading@10: float old_floor[BANDS]; yading@10: float flcoeffs1[BANDS]; yading@10: float flcoeffs2[BANDS]; yading@10: float flcoeffs3[BANDS]; yading@10: float flcoeffs4[BANDS]; yading@10: float flcoeffs5[BANDS]; yading@10: float flcoeffs6[BANDS]; yading@10: float CWdecoded[COEFFS]; yading@10: yading@10: int bandWidthT[BANDS]; ///< codewords per band yading@10: int bitsBandT[BANDS]; ///< how many bits per codeword in band yading@10: int CWlengthT[COEFFS]; ///< how many bits in each codeword yading@10: int levlCoeffBuf[BANDS]; yading@10: int bandFlagsBuf[BANDS]; ///< flags for each band yading@10: int sumLenArr[BANDS]; ///< bits for all coeffs in band yading@10: int skipFlagRaw[BANDS]; ///< skip flags are stored in raw form or not yading@10: int skipFlagBits[BANDS]; ///< bits used to code skip flags yading@10: int skipFlagCount[BANDS]; ///< skipped coeffients per band yading@10: int skipFlags[COEFFS]; ///< skip coefficient decoding or not yading@10: int codewords[COEFFS]; ///< raw codewords read from bitstream yading@10: yading@10: float last_fft_im[COEFFS]; yading@10: yading@10: int decoder_reset; yading@10: } IMCChannel; yading@10: yading@10: typedef struct { yading@10: IMCChannel chctx[2]; yading@10: yading@10: /** MDCT tables */ yading@10: //@{ yading@10: float mdct_sine_window[COEFFS]; yading@10: float post_cos[COEFFS]; yading@10: float post_sin[COEFFS]; yading@10: float pre_coef1[COEFFS]; yading@10: float pre_coef2[COEFFS]; yading@10: //@} yading@10: yading@10: float sqrt_tab[30]; yading@10: GetBitContext gb; yading@10: yading@10: DSPContext dsp; yading@10: AVFloatDSPContext fdsp; yading@10: FFTContext fft; yading@10: DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS / 2]; yading@10: float *out_samples; yading@10: yading@10: int8_t cyclTab[32], cyclTab2[32]; yading@10: float weights1[31], weights2[31]; yading@10: } IMCContext; yading@10: yading@10: static VLC huffman_vlc[4][4]; yading@10: yading@10: #define VLC_TABLES_SIZE 9512 yading@10: yading@10: static const int vlc_offsets[17] = { yading@10: 0, 640, 1156, 1732, 2308, 2852, 3396, 3924, yading@10: 4452, 5220, 5860, 6628, 7268, 7908, 8424, 8936, VLC_TABLES_SIZE yading@10: }; yading@10: yading@10: static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]; yading@10: yading@10: static inline double freq2bark(double freq) yading@10: { yading@10: return 3.5 * atan((freq / 7500.0) * (freq / 7500.0)) + 13.0 * atan(freq * 0.00076); yading@10: } yading@10: yading@10: static av_cold void iac_generate_tabs(IMCContext *q, int sampling_rate) yading@10: { yading@10: double freqmin[32], freqmid[32], freqmax[32]; yading@10: double scale = sampling_rate / (256.0 * 2.0 * 2.0); yading@10: double nyquist_freq = sampling_rate * 0.5; yading@10: double freq, bark, prev_bark = 0, tf, tb; yading@10: int i, j; yading@10: yading@10: for (i = 0; i < 32; i++) { yading@10: freq = (band_tab[i] + band_tab[i + 1] - 1) * scale; yading@10: bark = freq2bark(freq); yading@10: yading@10: if (i > 0) { yading@10: tb = bark - prev_bark; yading@10: q->weights1[i - 1] = pow(10.0, -1.0 * tb); yading@10: q->weights2[i - 1] = pow(10.0, -2.7 * tb); yading@10: } yading@10: prev_bark = bark; yading@10: yading@10: freqmid[i] = freq; yading@10: yading@10: tf = freq; yading@10: while (tf < nyquist_freq) { yading@10: tf += 0.5; yading@10: tb = freq2bark(tf); yading@10: if (tb > bark + 0.5) yading@10: break; yading@10: } yading@10: freqmax[i] = tf; yading@10: yading@10: tf = freq; yading@10: while (tf > 0.0) { yading@10: tf -= 0.5; yading@10: tb = freq2bark(tf); yading@10: if (tb <= bark - 0.5) yading@10: break; yading@10: } yading@10: freqmin[i] = tf; yading@10: } yading@10: yading@10: for (i = 0; i < 32; i++) { yading@10: freq = freqmax[i]; yading@10: for (j = 31; j > 0 && freq <= freqmid[j]; j--); yading@10: q->cyclTab[i] = j + 1; yading@10: yading@10: freq = freqmin[i]; yading@10: for (j = 0; j < 32 && freq >= freqmid[j]; j++); yading@10: q->cyclTab2[i] = j - 1; yading@10: } yading@10: } yading@10: yading@10: static av_cold int imc_decode_init(AVCodecContext *avctx) yading@10: { yading@10: int i, j, ret; yading@10: IMCContext *q = avctx->priv_data; yading@10: double r1, r2; yading@10: yading@10: if (avctx->codec_id == AV_CODEC_ID_IMC) yading@10: avctx->channels = 1; yading@10: yading@10: if (avctx->channels > 2) { yading@10: avpriv_request_sample(avctx, "Number of channels > 2"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: for (j = 0; j < avctx->channels; j++) { yading@10: q->chctx[j].decoder_reset = 1; yading@10: yading@10: for (i = 0; i < BANDS; i++) yading@10: q->chctx[j].old_floor[i] = 1.0; yading@10: yading@10: for (i = 0; i < COEFFS / 2; i++) yading@10: q->chctx[j].last_fft_im[i] = 0; yading@10: } yading@10: yading@10: /* Build mdct window, a simple sine window normalized with sqrt(2) */ yading@10: ff_sine_window_init(q->mdct_sine_window, COEFFS); yading@10: for (i = 0; i < COEFFS; i++) yading@10: q->mdct_sine_window[i] *= sqrt(2.0); yading@10: for (i = 0; i < COEFFS / 2; i++) { yading@10: q->post_cos[i] = (1.0f / 32768) * cos(i / 256.0 * M_PI); yading@10: q->post_sin[i] = (1.0f / 32768) * sin(i / 256.0 * M_PI); yading@10: yading@10: r1 = sin((i * 4.0 + 1.0) / 1024.0 * M_PI); yading@10: r2 = cos((i * 4.0 + 1.0) / 1024.0 * M_PI); yading@10: yading@10: if (i & 0x1) { yading@10: q->pre_coef1[i] = (r1 + r2) * sqrt(2.0); yading@10: q->pre_coef2[i] = -(r1 - r2) * sqrt(2.0); yading@10: } else { yading@10: q->pre_coef1[i] = -(r1 + r2) * sqrt(2.0); yading@10: q->pre_coef2[i] = (r1 - r2) * sqrt(2.0); yading@10: } yading@10: } yading@10: yading@10: /* Generate a square root table */ yading@10: yading@10: for (i = 0; i < 30; i++) yading@10: q->sqrt_tab[i] = sqrt(i); yading@10: yading@10: /* initialize the VLC tables */ yading@10: for (i = 0; i < 4 ; i++) { yading@10: for (j = 0; j < 4; j++) { yading@10: huffman_vlc[i][j].table = &vlc_tables[vlc_offsets[i * 4 + j]]; yading@10: huffman_vlc[i][j].table_allocated = vlc_offsets[i * 4 + j + 1] - vlc_offsets[i * 4 + j]; yading@10: init_vlc(&huffman_vlc[i][j], 9, imc_huffman_sizes[i], yading@10: imc_huffman_lens[i][j], 1, 1, yading@10: imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC); yading@10: } yading@10: } yading@10: yading@10: if (avctx->codec_id == AV_CODEC_ID_IAC) { yading@10: iac_generate_tabs(q, avctx->sample_rate); yading@10: } else { yading@10: memcpy(q->cyclTab, cyclTab, sizeof(cyclTab)); yading@10: memcpy(q->cyclTab2, cyclTab2, sizeof(cyclTab2)); yading@10: memcpy(q->weights1, imc_weights1, sizeof(imc_weights1)); yading@10: memcpy(q->weights2, imc_weights2, sizeof(imc_weights2)); yading@10: } yading@10: yading@10: if ((ret = ff_fft_init(&q->fft, 7, 1))) { yading@10: av_log(avctx, AV_LOG_INFO, "FFT init failed\n"); yading@10: return ret; yading@10: } yading@10: ff_dsputil_init(&q->dsp, avctx); yading@10: avpriv_float_dsp_init(&q->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; yading@10: avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO yading@10: : AV_CH_LAYOUT_STEREO; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1, yading@10: float *flcoeffs2, int *bandWidthT, yading@10: float *flcoeffs3, float *flcoeffs5) yading@10: { yading@10: float workT1[BANDS]; yading@10: float workT2[BANDS]; yading@10: float workT3[BANDS]; yading@10: float snr_limit = 1.e-30; yading@10: float accum = 0.0; yading@10: int i, cnt2; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: flcoeffs5[i] = workT2[i] = 0.0; yading@10: if (bandWidthT[i]) { yading@10: workT1[i] = flcoeffs1[i] * flcoeffs1[i]; yading@10: flcoeffs3[i] = 2.0 * flcoeffs2[i]; yading@10: } else { yading@10: workT1[i] = 0.0; yading@10: flcoeffs3[i] = -30000.0; yading@10: } yading@10: workT3[i] = bandWidthT[i] * workT1[i] * 0.01; yading@10: if (workT3[i] <= snr_limit) yading@10: workT3[i] = 0.0; yading@10: } yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: for (cnt2 = i; cnt2 < q->cyclTab[i]; cnt2++) yading@10: flcoeffs5[cnt2] = flcoeffs5[cnt2] + workT3[i]; yading@10: workT2[cnt2 - 1] = workT2[cnt2 - 1] + workT3[i]; yading@10: } yading@10: yading@10: for (i = 1; i < BANDS; i++) { yading@10: accum = (workT2[i - 1] + accum) * q->weights1[i - 1]; yading@10: flcoeffs5[i] += accum; yading@10: } yading@10: yading@10: for (i = 0; i < BANDS; i++) yading@10: workT2[i] = 0.0; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: for (cnt2 = i - 1; cnt2 > q->cyclTab2[i]; cnt2--) yading@10: flcoeffs5[cnt2] += workT3[i]; yading@10: workT2[cnt2+1] += workT3[i]; yading@10: } yading@10: yading@10: accum = 0.0; yading@10: yading@10: for (i = BANDS-2; i >= 0; i--) { yading@10: accum = (workT2[i+1] + accum) * q->weights2[i]; yading@10: flcoeffs5[i] += accum; yading@10: // there is missing code here, but it seems to never be triggered yading@10: } yading@10: } yading@10: yading@10: yading@10: static void imc_read_level_coeffs(IMCContext *q, int stream_format_code, yading@10: int *levlCoeffs) yading@10: { yading@10: int i; yading@10: VLC *hufftab[4]; yading@10: int start = 0; yading@10: const uint8_t *cb_sel; yading@10: int s; yading@10: yading@10: s = stream_format_code >> 1; yading@10: hufftab[0] = &huffman_vlc[s][0]; yading@10: hufftab[1] = &huffman_vlc[s][1]; yading@10: hufftab[2] = &huffman_vlc[s][2]; yading@10: hufftab[3] = &huffman_vlc[s][3]; yading@10: cb_sel = imc_cb_select[s]; yading@10: yading@10: if (stream_format_code & 4) yading@10: start = 1; yading@10: if (start) yading@10: levlCoeffs[0] = get_bits(&q->gb, 7); yading@10: for (i = start; i < BANDS; i++) { yading@10: levlCoeffs[i] = get_vlc2(&q->gb, hufftab[cb_sel[i]]->table, yading@10: hufftab[cb_sel[i]]->bits, 2); yading@10: if (levlCoeffs[i] == 17) yading@10: levlCoeffs[i] += get_bits(&q->gb, 4); yading@10: } yading@10: } yading@10: yading@10: static void imc_decode_level_coefficients(IMCContext *q, int *levlCoeffBuf, yading@10: float *flcoeffs1, float *flcoeffs2) yading@10: { yading@10: int i, level; yading@10: float tmp, tmp2; yading@10: // maybe some frequency division thingy yading@10: yading@10: flcoeffs1[0] = 20000.0 / exp2 (levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125 yading@10: flcoeffs2[0] = log2f(flcoeffs1[0]); yading@10: tmp = flcoeffs1[0]; yading@10: tmp2 = flcoeffs2[0]; yading@10: yading@10: for (i = 1; i < BANDS; i++) { yading@10: level = levlCoeffBuf[i]; yading@10: if (level == 16) { yading@10: flcoeffs1[i] = 1.0; yading@10: flcoeffs2[i] = 0.0; yading@10: } else { yading@10: if (level < 17) yading@10: level -= 7; yading@10: else if (level <= 24) yading@10: level -= 32; yading@10: else yading@10: level -= 16; yading@10: yading@10: tmp *= imc_exp_tab[15 + level]; yading@10: tmp2 += 0.83048 * level; // 0.83048 = log2(10) * 0.25 yading@10: flcoeffs1[i] = tmp; yading@10: flcoeffs2[i] = tmp2; yading@10: } yading@10: } yading@10: } yading@10: yading@10: yading@10: static void imc_decode_level_coefficients2(IMCContext *q, int *levlCoeffBuf, yading@10: float *old_floor, float *flcoeffs1, yading@10: float *flcoeffs2) yading@10: { yading@10: int i; yading@10: /* FIXME maybe flag_buf = noise coding and flcoeffs1 = new scale factors yading@10: * and flcoeffs2 old scale factors yading@10: * might be incomplete due to a missing table that is in the binary code yading@10: */ yading@10: for (i = 0; i < BANDS; i++) { yading@10: flcoeffs1[i] = 0; yading@10: if (levlCoeffBuf[i] < 16) { yading@10: flcoeffs1[i] = imc_exp_tab2[levlCoeffBuf[i]] * old_floor[i]; yading@10: flcoeffs2[i] = (levlCoeffBuf[i] - 7) * 0.83048 + flcoeffs2[i]; // 0.83048 = log2(10) * 0.25 yading@10: } else { yading@10: flcoeffs1[i] = old_floor[i]; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Perform bit allocation depending on bits available yading@10: */ yading@10: static int bit_allocation(IMCContext *q, IMCChannel *chctx, yading@10: int stream_format_code, int freebits, int flag) yading@10: { yading@10: int i, j; yading@10: const float limit = -1.e20; yading@10: float highest = 0.0; yading@10: int indx; yading@10: int t1 = 0; yading@10: int t2 = 1; yading@10: float summa = 0.0; yading@10: int iacc = 0; yading@10: int summer = 0; yading@10: int rres, cwlen; yading@10: float lowest = 1.e10; yading@10: int low_indx = 0; yading@10: float workT[32]; yading@10: int flg; yading@10: int found_indx = 0; yading@10: yading@10: for (i = 0; i < BANDS; i++) yading@10: highest = FFMAX(highest, chctx->flcoeffs1[i]); yading@10: yading@10: for (i = 0; i < BANDS - 1; i++) yading@10: chctx->flcoeffs4[i] = chctx->flcoeffs3[i] - log2f(chctx->flcoeffs5[i]); yading@10: chctx->flcoeffs4[BANDS - 1] = limit; yading@10: yading@10: highest = highest * 0.25; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: indx = -1; yading@10: if ((band_tab[i + 1] - band_tab[i]) == chctx->bandWidthT[i]) yading@10: indx = 0; yading@10: yading@10: if ((band_tab[i + 1] - band_tab[i]) > chctx->bandWidthT[i]) yading@10: indx = 1; yading@10: yading@10: if (((band_tab[i + 1] - band_tab[i]) / 2) >= chctx->bandWidthT[i]) yading@10: indx = 2; yading@10: yading@10: if (indx == -1) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: chctx->flcoeffs4[i] += xTab[(indx * 2 + (chctx->flcoeffs1[i] < highest)) * 2 + flag]; yading@10: } yading@10: yading@10: if (stream_format_code & 0x2) { yading@10: chctx->flcoeffs4[0] = limit; yading@10: chctx->flcoeffs4[1] = limit; yading@10: chctx->flcoeffs4[2] = limit; yading@10: chctx->flcoeffs4[3] = limit; yading@10: } yading@10: yading@10: for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS - 1; i++) { yading@10: iacc += chctx->bandWidthT[i]; yading@10: summa += chctx->bandWidthT[i] * chctx->flcoeffs4[i]; yading@10: } yading@10: chctx->bandWidthT[BANDS - 1] = 0; yading@10: summa = (summa * 0.5 - freebits) / iacc; yading@10: yading@10: yading@10: for (i = 0; i < BANDS / 2; i++) { yading@10: rres = summer - freebits; yading@10: if ((rres >= -8) && (rres <= 8)) yading@10: break; yading@10: yading@10: summer = 0; yading@10: iacc = 0; yading@10: yading@10: for (j = (stream_format_code & 0x2) ? 4 : 0; j < BANDS; j++) { yading@10: cwlen = av_clipf(((chctx->flcoeffs4[j] * 0.5) - summa + 0.5), 0, 6); yading@10: yading@10: chctx->bitsBandT[j] = cwlen; yading@10: summer += chctx->bandWidthT[j] * cwlen; yading@10: yading@10: if (cwlen > 0) yading@10: iacc += chctx->bandWidthT[j]; yading@10: } yading@10: yading@10: flg = t2; yading@10: t2 = 1; yading@10: if (freebits < summer) yading@10: t2 = -1; yading@10: if (i == 0) yading@10: flg = t2; yading@10: if (flg != t2) yading@10: t1++; yading@10: yading@10: summa = (float)(summer - freebits) / ((t1 + 1) * iacc) + summa; yading@10: } yading@10: yading@10: for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS; i++) { yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) yading@10: chctx->CWlengthT[j] = chctx->bitsBandT[i]; yading@10: } yading@10: yading@10: if (freebits > summer) { yading@10: for (i = 0; i < BANDS; i++) { yading@10: workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20 yading@10: : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415); yading@10: } yading@10: yading@10: highest = 0.0; yading@10: yading@10: do { yading@10: if (highest <= -1.e20) yading@10: break; yading@10: yading@10: found_indx = 0; yading@10: highest = -1.e20; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: if (workT[i] > highest) { yading@10: highest = workT[i]; yading@10: found_indx = i; yading@10: } yading@10: } yading@10: yading@10: if (highest > -1.e20) { yading@10: workT[found_indx] -= 2.0; yading@10: if (++chctx->bitsBandT[found_indx] == 6) yading@10: workT[found_indx] = -1.e20; yading@10: yading@10: for (j = band_tab[found_indx]; j < band_tab[found_indx + 1] && (freebits > summer); j++) { yading@10: chctx->CWlengthT[j]++; yading@10: summer++; yading@10: } yading@10: } yading@10: } while (freebits > summer); yading@10: } yading@10: if (freebits < summer) { yading@10: for (i = 0; i < BANDS; i++) { yading@10: workT[i] = chctx->bitsBandT[i] ? (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] + 1.585) yading@10: : 1.e20; yading@10: } yading@10: if (stream_format_code & 0x2) { yading@10: workT[0] = 1.e20; yading@10: workT[1] = 1.e20; yading@10: workT[2] = 1.e20; yading@10: workT[3] = 1.e20; yading@10: } yading@10: while (freebits < summer) { yading@10: lowest = 1.e10; yading@10: low_indx = 0; yading@10: for (i = 0; i < BANDS; i++) { yading@10: if (workT[i] < lowest) { yading@10: lowest = workT[i]; yading@10: low_indx = i; yading@10: } yading@10: } yading@10: // if (lowest >= 1.e10) yading@10: // break; yading@10: workT[low_indx] = lowest + 2.0; yading@10: yading@10: if (!--chctx->bitsBandT[low_indx]) yading@10: workT[low_indx] = 1.e20; yading@10: yading@10: for (j = band_tab[low_indx]; j < band_tab[low_indx+1] && (freebits < summer); j++) { yading@10: if (chctx->CWlengthT[j] > 0) { yading@10: chctx->CWlengthT[j]--; yading@10: summer--; yading@10: } yading@10: } yading@10: } yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: static void imc_get_skip_coeff(IMCContext *q, IMCChannel *chctx) yading@10: { yading@10: int i, j; yading@10: yading@10: memset(chctx->skipFlagBits, 0, sizeof(chctx->skipFlagBits)); yading@10: memset(chctx->skipFlagCount, 0, sizeof(chctx->skipFlagCount)); yading@10: for (i = 0; i < BANDS; i++) { yading@10: if (!chctx->bandFlagsBuf[i] || !chctx->bandWidthT[i]) yading@10: continue; yading@10: yading@10: if (!chctx->skipFlagRaw[i]) { yading@10: chctx->skipFlagBits[i] = band_tab[i + 1] - band_tab[i]; yading@10: yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) { yading@10: chctx->skipFlags[j] = get_bits1(&q->gb); yading@10: if (chctx->skipFlags[j]) yading@10: chctx->skipFlagCount[i]++; yading@10: } yading@10: } else { yading@10: for (j = band_tab[i]; j < band_tab[i + 1] - 1; j += 2) { yading@10: if (!get_bits1(&q->gb)) { // 0 yading@10: chctx->skipFlagBits[i]++; yading@10: chctx->skipFlags[j] = 1; yading@10: chctx->skipFlags[j + 1] = 1; yading@10: chctx->skipFlagCount[i] += 2; yading@10: } else { yading@10: if (get_bits1(&q->gb)) { // 11 yading@10: chctx->skipFlagBits[i] += 2; yading@10: chctx->skipFlags[j] = 0; yading@10: chctx->skipFlags[j + 1] = 1; yading@10: chctx->skipFlagCount[i]++; yading@10: } else { yading@10: chctx->skipFlagBits[i] += 3; yading@10: chctx->skipFlags[j + 1] = 0; yading@10: if (!get_bits1(&q->gb)) { // 100 yading@10: chctx->skipFlags[j] = 1; yading@10: chctx->skipFlagCount[i]++; yading@10: } else { // 101 yading@10: chctx->skipFlags[j] = 0; yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: if (j < band_tab[i + 1]) { yading@10: chctx->skipFlagBits[i]++; yading@10: if ((chctx->skipFlags[j] = get_bits1(&q->gb))) yading@10: chctx->skipFlagCount[i]++; yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: * Increase highest' band coefficient sizes as some bits won't be used yading@10: */ yading@10: static void imc_adjust_bit_allocation(IMCContext *q, IMCChannel *chctx, yading@10: int summer) yading@10: { yading@10: float workT[32]; yading@10: int corrected = 0; yading@10: int i, j; yading@10: float highest = 0; yading@10: int found_indx = 0; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20 yading@10: : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415); yading@10: } yading@10: yading@10: while (corrected < summer) { yading@10: if (highest <= -1.e20) yading@10: break; yading@10: yading@10: highest = -1.e20; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: if (workT[i] > highest) { yading@10: highest = workT[i]; yading@10: found_indx = i; yading@10: } yading@10: } yading@10: yading@10: if (highest > -1.e20) { yading@10: workT[found_indx] -= 2.0; yading@10: if (++(chctx->bitsBandT[found_indx]) == 6) yading@10: workT[found_indx] = -1.e20; yading@10: yading@10: for (j = band_tab[found_indx]; j < band_tab[found_indx+1] && (corrected < summer); j++) { yading@10: if (!chctx->skipFlags[j] && (chctx->CWlengthT[j] < 6)) { yading@10: chctx->CWlengthT[j]++; yading@10: corrected++; yading@10: } yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: static void imc_imdct256(IMCContext *q, IMCChannel *chctx, int channels) yading@10: { yading@10: int i; yading@10: float re, im; yading@10: float *dst1 = q->out_samples; yading@10: float *dst2 = q->out_samples + (COEFFS - 1); yading@10: yading@10: /* prerotation */ yading@10: for (i = 0; i < COEFFS / 2; i++) { yading@10: q->samples[i].re = -(q->pre_coef1[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) - yading@10: (q->pre_coef2[i] * chctx->CWdecoded[i * 2]); yading@10: q->samples[i].im = (q->pre_coef2[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) - yading@10: (q->pre_coef1[i] * chctx->CWdecoded[i * 2]); yading@10: } yading@10: yading@10: /* FFT */ yading@10: q->fft.fft_permute(&q->fft, q->samples); yading@10: q->fft.fft_calc(&q->fft, q->samples); yading@10: yading@10: /* postrotation, window and reorder */ yading@10: for (i = 0; i < COEFFS / 2; i++) { yading@10: re = ( q->samples[i].re * q->post_cos[i]) + (-q->samples[i].im * q->post_sin[i]); yading@10: im = (-q->samples[i].im * q->post_cos[i]) - ( q->samples[i].re * q->post_sin[i]); yading@10: *dst1 = (q->mdct_sine_window[COEFFS - 1 - i * 2] * chctx->last_fft_im[i]) yading@10: + (q->mdct_sine_window[i * 2] * re); yading@10: *dst2 = (q->mdct_sine_window[i * 2] * chctx->last_fft_im[i]) yading@10: - (q->mdct_sine_window[COEFFS - 1 - i * 2] * re); yading@10: dst1 += 2; yading@10: dst2 -= 2; yading@10: chctx->last_fft_im[i] = im; yading@10: } yading@10: } yading@10: yading@10: static int inverse_quant_coeff(IMCContext *q, IMCChannel *chctx, yading@10: int stream_format_code) yading@10: { yading@10: int i, j; yading@10: int middle_value, cw_len, max_size; yading@10: const float *quantizer; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) { yading@10: chctx->CWdecoded[j] = 0; yading@10: cw_len = chctx->CWlengthT[j]; yading@10: yading@10: if (cw_len <= 0 || chctx->skipFlags[j]) yading@10: continue; yading@10: yading@10: max_size = 1 << cw_len; yading@10: middle_value = max_size >> 1; yading@10: yading@10: if (chctx->codewords[j] >= max_size || chctx->codewords[j] < 0) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: if (cw_len >= 4) { yading@10: quantizer = imc_quantizer2[(stream_format_code & 2) >> 1]; yading@10: if (chctx->codewords[j] >= middle_value) yading@10: chctx->CWdecoded[j] = quantizer[chctx->codewords[j] - 8] * chctx->flcoeffs6[i]; yading@10: else yading@10: chctx->CWdecoded[j] = -quantizer[max_size - chctx->codewords[j] - 8 - 1] * chctx->flcoeffs6[i]; yading@10: }else{ yading@10: quantizer = imc_quantizer1[((stream_format_code & 2) >> 1) | (chctx->bandFlagsBuf[i] << 1)]; yading@10: if (chctx->codewords[j] >= middle_value) yading@10: chctx->CWdecoded[j] = quantizer[chctx->codewords[j] - 1] * chctx->flcoeffs6[i]; yading@10: else yading@10: chctx->CWdecoded[j] = -quantizer[max_size - 2 - chctx->codewords[j]] * chctx->flcoeffs6[i]; yading@10: } yading@10: } yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: static int imc_get_coeffs(IMCContext *q, IMCChannel *chctx) yading@10: { yading@10: int i, j, cw_len, cw; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: if (!chctx->sumLenArr[i]) yading@10: continue; yading@10: if (chctx->bandFlagsBuf[i] || chctx->bandWidthT[i]) { yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) { yading@10: cw_len = chctx->CWlengthT[j]; yading@10: cw = 0; yading@10: yading@10: if (get_bits_count(&q->gb) + cw_len > 512) { yading@10: av_dlog(NULL, "Band %i coeff %i cw_len %i\n", i, j, cw_len); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (cw_len && (!chctx->bandFlagsBuf[i] || !chctx->skipFlags[j])) yading@10: cw = get_bits(&q->gb, cw_len); yading@10: yading@10: chctx->codewords[j] = cw; yading@10: } yading@10: } yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch) yading@10: { yading@10: int stream_format_code; yading@10: int imc_hdr, i, j, ret; yading@10: int flag; yading@10: int bits, summer; yading@10: int counter, bitscount; yading@10: IMCChannel *chctx = q->chctx + ch; yading@10: yading@10: yading@10: /* Check the frame header */ yading@10: imc_hdr = get_bits(&q->gb, 9); yading@10: if (imc_hdr & 0x18) { yading@10: av_log(avctx, AV_LOG_ERROR, "frame header check failed!\n"); yading@10: av_log(avctx, AV_LOG_ERROR, "got %X.\n", imc_hdr); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: stream_format_code = get_bits(&q->gb, 3); yading@10: yading@10: if (stream_format_code & 1) { yading@10: avpriv_request_sample(avctx, "Stream format %X", stream_format_code); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: if (stream_format_code & 0x04) yading@10: chctx->decoder_reset = 1; yading@10: yading@10: if (chctx->decoder_reset) { yading@10: for (i = 0; i < BANDS; i++) yading@10: chctx->old_floor[i] = 1.0; yading@10: for (i = 0; i < COEFFS; i++) yading@10: chctx->CWdecoded[i] = 0; yading@10: chctx->decoder_reset = 0; yading@10: } yading@10: yading@10: flag = get_bits1(&q->gb); yading@10: imc_read_level_coeffs(q, stream_format_code, chctx->levlCoeffBuf); yading@10: yading@10: if (stream_format_code & 0x4) yading@10: imc_decode_level_coefficients(q, chctx->levlCoeffBuf, yading@10: chctx->flcoeffs1, chctx->flcoeffs2); yading@10: else yading@10: imc_decode_level_coefficients2(q, chctx->levlCoeffBuf, chctx->old_floor, yading@10: chctx->flcoeffs1, chctx->flcoeffs2); yading@10: yading@10: for(i=0; iflcoeffs1[i] > INT_MAX) { yading@10: av_log(avctx, AV_LOG_ERROR, "scalefactor out of range\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } yading@10: yading@10: memcpy(chctx->old_floor, chctx->flcoeffs1, 32 * sizeof(float)); yading@10: yading@10: counter = 0; yading@10: for (i = 0; i < BANDS; i++) { yading@10: if (chctx->levlCoeffBuf[i] == 16) { yading@10: chctx->bandWidthT[i] = 0; yading@10: counter++; yading@10: } else yading@10: chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i]; yading@10: } yading@10: memset(chctx->bandFlagsBuf, 0, BANDS * sizeof(int)); yading@10: for (i = 0; i < BANDS - 1; i++) { yading@10: if (chctx->bandWidthT[i]) yading@10: chctx->bandFlagsBuf[i] = get_bits1(&q->gb); yading@10: } yading@10: yading@10: imc_calculate_coeffs(q, chctx->flcoeffs1, chctx->flcoeffs2, chctx->bandWidthT, chctx->flcoeffs3, chctx->flcoeffs5); yading@10: yading@10: bitscount = 0; yading@10: /* first 4 bands will be assigned 5 bits per coefficient */ yading@10: if (stream_format_code & 0x2) { yading@10: bitscount += 15; yading@10: yading@10: chctx->bitsBandT[0] = 5; yading@10: chctx->CWlengthT[0] = 5; yading@10: chctx->CWlengthT[1] = 5; yading@10: chctx->CWlengthT[2] = 5; yading@10: for (i = 1; i < 4; i++) { yading@10: bits = (chctx->levlCoeffBuf[i] == 16) ? 0 : 5; yading@10: chctx->bitsBandT[i] = bits; yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) { yading@10: chctx->CWlengthT[j] = bits; yading@10: bitscount += bits; yading@10: } yading@10: } yading@10: } yading@10: if (avctx->codec_id == AV_CODEC_ID_IAC) { yading@10: bitscount += !!chctx->bandWidthT[BANDS - 1]; yading@10: if (!(stream_format_code & 0x2)) yading@10: bitscount += 16; yading@10: } yading@10: yading@10: if ((ret = bit_allocation(q, chctx, stream_format_code, yading@10: 512 - bitscount - get_bits_count(&q->gb), yading@10: flag)) < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "Bit allocations failed\n"); yading@10: chctx->decoder_reset = 1; yading@10: return ret; yading@10: } yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: chctx->sumLenArr[i] = 0; yading@10: chctx->skipFlagRaw[i] = 0; yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) yading@10: chctx->sumLenArr[i] += chctx->CWlengthT[j]; yading@10: if (chctx->bandFlagsBuf[i]) yading@10: if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > chctx->sumLenArr[i]) && (chctx->sumLenArr[i] > 0)) yading@10: chctx->skipFlagRaw[i] = 1; yading@10: } yading@10: yading@10: imc_get_skip_coeff(q, chctx); yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: chctx->flcoeffs6[i] = chctx->flcoeffs1[i]; yading@10: /* band has flag set and at least one coded coefficient */ yading@10: if (chctx->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != chctx->skipFlagCount[i]) { yading@10: chctx->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] / yading@10: q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - chctx->skipFlagCount[i])]; yading@10: } yading@10: } yading@10: yading@10: /* calculate bits left, bits needed and adjust bit allocation */ yading@10: bits = summer = 0; yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: if (chctx->bandFlagsBuf[i]) { yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) { yading@10: if (chctx->skipFlags[j]) { yading@10: summer += chctx->CWlengthT[j]; yading@10: chctx->CWlengthT[j] = 0; yading@10: } yading@10: } yading@10: bits += chctx->skipFlagBits[i]; yading@10: summer -= chctx->skipFlagBits[i]; yading@10: } yading@10: } yading@10: imc_adjust_bit_allocation(q, chctx, summer); yading@10: yading@10: for (i = 0; i < BANDS; i++) { yading@10: chctx->sumLenArr[i] = 0; yading@10: yading@10: for (j = band_tab[i]; j < band_tab[i + 1]; j++) yading@10: if (!chctx->skipFlags[j]) yading@10: chctx->sumLenArr[i] += chctx->CWlengthT[j]; yading@10: } yading@10: yading@10: memset(chctx->codewords, 0, sizeof(chctx->codewords)); yading@10: yading@10: if (imc_get_coeffs(q, chctx) < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "Read coefficients failed\n"); yading@10: chctx->decoder_reset = 1; yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (inverse_quant_coeff(q, chctx, stream_format_code) < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "Inverse quantization of coefficients failed\n"); yading@10: chctx->decoder_reset = 1; yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: memset(chctx->skipFlags, 0, sizeof(chctx->skipFlags)); yading@10: yading@10: imc_imdct256(q, chctx, avctx->channels); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int imc_decode_frame(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: int ret, i; yading@10: yading@10: IMCContext *q = avctx->priv_data; yading@10: yading@10: LOCAL_ALIGNED_16(uint16_t, buf16, [IMC_BLOCK_SIZE / 2]); yading@10: yading@10: if (buf_size < IMC_BLOCK_SIZE * avctx->channels) { yading@10: av_log(avctx, AV_LOG_ERROR, "frame too small!\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: /* get output buffer */ yading@10: frame->nb_samples = COEFFS; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: yading@10: for (i = 0; i < avctx->channels; i++) { yading@10: q->out_samples = (float *)frame->extended_data[i]; yading@10: yading@10: q->dsp.bswap16_buf(buf16, (const uint16_t*)buf, IMC_BLOCK_SIZE / 2); yading@10: yading@10: init_get_bits(&q->gb, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8); yading@10: yading@10: buf += IMC_BLOCK_SIZE; yading@10: yading@10: if ((ret = imc_decode_block(avctx, q, i)) < 0) yading@10: return ret; yading@10: } yading@10: yading@10: if (avctx->channels == 2) { yading@10: q->fdsp.butterflies_float((float *)frame->extended_data[0], yading@10: (float *)frame->extended_data[1], COEFFS); yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return IMC_BLOCK_SIZE * avctx->channels; yading@10: } yading@10: yading@10: yading@10: static av_cold int imc_decode_close(AVCodecContext * avctx) yading@10: { yading@10: IMCContext *q = avctx->priv_data; yading@10: yading@10: ff_fft_end(&q->fft); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static av_cold void flush(AVCodecContext *avctx) yading@10: { yading@10: IMCContext *q = avctx->priv_data; yading@10: yading@10: q->chctx[0].decoder_reset = yading@10: q->chctx[1].decoder_reset = 1; yading@10: } yading@10: yading@10: #if CONFIG_IMC_DECODER yading@10: AVCodec ff_imc_decoder = { yading@10: .name = "imc", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_IMC, yading@10: .priv_data_size = sizeof(IMCContext), yading@10: .init = imc_decode_init, yading@10: .close = imc_decode_close, yading@10: .decode = imc_decode_frame, yading@10: .flush = flush, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("IMC (Intel Music Coder)"), 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_IAC_DECODER yading@10: AVCodec ff_iac_decoder = { yading@10: .name = "iac", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_IAC, yading@10: .priv_data_size = sizeof(IMCContext), yading@10: .init = imc_decode_init, yading@10: .close = imc_decode_close, yading@10: .decode = imc_decode_frame, yading@10: .flush = flush, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("IAC (Indeo Audio Coder)"), yading@10: .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, yading@10: AV_SAMPLE_FMT_NONE }, yading@10: }; yading@10: #endif