From 22e28216336da876e1fd17f380ce42eaf1446769 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Mon, 17 Feb 2014 13:36:38 +0000 Subject: chasing indexing error --- ffmpeg/libavcodec/imc.c | 1097 ----------------------------------------------- 1 file changed, 1097 deletions(-) delete mode 100644 ffmpeg/libavcodec/imc.c (limited to 'ffmpeg/libavcodec/imc.c') diff --git a/ffmpeg/libavcodec/imc.c b/ffmpeg/libavcodec/imc.c deleted file mode 100644 index cbd7041..0000000 --- a/ffmpeg/libavcodec/imc.c +++ /dev/null @@ -1,1097 +0,0 @@ -/* - * IMC compatible decoder - * Copyright (c) 2002-2004 Maxim Poliakovski - * Copyright (c) 2006 Benjamin Larsson - * Copyright (c) 2006 Konstantin Shishkov - * - * 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 - * IMC - Intel Music Coder - * A mdct based codec using a 256 points large transform - * divided into 32 bands with some mix of scale factors. - * Only mono is supported. - * - */ - - -#include -#include -#include - -#include "libavutil/channel_layout.h" -#include "libavutil/float_dsp.h" -#include "libavutil/internal.h" -#include "libavutil/libm.h" -#include "avcodec.h" -#include "get_bits.h" -#include "dsputil.h" -#include "fft.h" -#include "internal.h" -#include "sinewin.h" - -#include "imcdata.h" - -#define IMC_BLOCK_SIZE 64 -#define IMC_FRAME_ID 0x21 -#define BANDS 32 -#define COEFFS 256 - -typedef struct IMCChannel { - float old_floor[BANDS]; - float flcoeffs1[BANDS]; - float flcoeffs2[BANDS]; - float flcoeffs3[BANDS]; - float flcoeffs4[BANDS]; - float flcoeffs5[BANDS]; - float flcoeffs6[BANDS]; - float CWdecoded[COEFFS]; - - int bandWidthT[BANDS]; ///< codewords per band - int bitsBandT[BANDS]; ///< how many bits per codeword in band - int CWlengthT[COEFFS]; ///< how many bits in each codeword - int levlCoeffBuf[BANDS]; - int bandFlagsBuf[BANDS]; ///< flags for each band - int sumLenArr[BANDS]; ///< bits for all coeffs in band - int skipFlagRaw[BANDS]; ///< skip flags are stored in raw form or not - int skipFlagBits[BANDS]; ///< bits used to code skip flags - int skipFlagCount[BANDS]; ///< skipped coeffients per band - int skipFlags[COEFFS]; ///< skip coefficient decoding or not - int codewords[COEFFS]; ///< raw codewords read from bitstream - - float last_fft_im[COEFFS]; - - int decoder_reset; -} IMCChannel; - -typedef struct { - IMCChannel chctx[2]; - - /** MDCT tables */ - //@{ - float mdct_sine_window[COEFFS]; - float post_cos[COEFFS]; - float post_sin[COEFFS]; - float pre_coef1[COEFFS]; - float pre_coef2[COEFFS]; - //@} - - float sqrt_tab[30]; - GetBitContext gb; - - DSPContext dsp; - AVFloatDSPContext fdsp; - FFTContext fft; - DECLARE_ALIGNED(32, FFTComplex, samples)[COEFFS / 2]; - float *out_samples; - - int coef0_pos; - - int8_t cyclTab[32], cyclTab2[32]; - float weights1[31], weights2[31]; -} IMCContext; - -static VLC huffman_vlc[4][4]; - -#define VLC_TABLES_SIZE 9512 - -static const int vlc_offsets[17] = { - 0, 640, 1156, 1732, 2308, 2852, 3396, 3924, - 4452, 5220, 5860, 6628, 7268, 7908, 8424, 8936, VLC_TABLES_SIZE -}; - -static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2]; - -static inline double freq2bark(double freq) -{ - return 3.5 * atan((freq / 7500.0) * (freq / 7500.0)) + 13.0 * atan(freq * 0.00076); -} - -static av_cold void iac_generate_tabs(IMCContext *q, int sampling_rate) -{ - double freqmin[32], freqmid[32], freqmax[32]; - double scale = sampling_rate / (256.0 * 2.0 * 2.0); - double nyquist_freq = sampling_rate * 0.5; - double freq, bark, prev_bark = 0, tf, tb; - int i, j; - - for (i = 0; i < 32; i++) { - freq = (band_tab[i] + band_tab[i + 1] - 1) * scale; - bark = freq2bark(freq); - - if (i > 0) { - tb = bark - prev_bark; - q->weights1[i - 1] = pow(10.0, -1.0 * tb); - q->weights2[i - 1] = pow(10.0, -2.7 * tb); - } - prev_bark = bark; - - freqmid[i] = freq; - - tf = freq; - while (tf < nyquist_freq) { - tf += 0.5; - tb = freq2bark(tf); - if (tb > bark + 0.5) - break; - } - freqmax[i] = tf; - - tf = freq; - while (tf > 0.0) { - tf -= 0.5; - tb = freq2bark(tf); - if (tb <= bark - 0.5) - break; - } - freqmin[i] = tf; - } - - for (i = 0; i < 32; i++) { - freq = freqmax[i]; - for (j = 31; j > 0 && freq <= freqmid[j]; j--); - q->cyclTab[i] = j + 1; - - freq = freqmin[i]; - for (j = 0; j < 32 && freq >= freqmid[j]; j++); - q->cyclTab2[i] = j - 1; - } -} - -static av_cold int imc_decode_init(AVCodecContext *avctx) -{ - int i, j, ret; - IMCContext *q = avctx->priv_data; - double r1, r2; - - if (avctx->codec_id == AV_CODEC_ID_IMC) - avctx->channels = 1; - - if (avctx->channels > 2) { - avpriv_request_sample(avctx, "Number of channels > 2"); - return AVERROR_PATCHWELCOME; - } - - for (j = 0; j < avctx->channels; j++) { - q->chctx[j].decoder_reset = 1; - - for (i = 0; i < BANDS; i++) - q->chctx[j].old_floor[i] = 1.0; - - for (i = 0; i < COEFFS / 2; i++) - q->chctx[j].last_fft_im[i] = 0; - } - - /* Build mdct window, a simple sine window normalized with sqrt(2) */ - ff_sine_window_init(q->mdct_sine_window, COEFFS); - for (i = 0; i < COEFFS; i++) - q->mdct_sine_window[i] *= sqrt(2.0); - for (i = 0; i < COEFFS / 2; i++) { - q->post_cos[i] = (1.0f / 32768) * cos(i / 256.0 * M_PI); - q->post_sin[i] = (1.0f / 32768) * sin(i / 256.0 * M_PI); - - r1 = sin((i * 4.0 + 1.0) / 1024.0 * M_PI); - r2 = cos((i * 4.0 + 1.0) / 1024.0 * M_PI); - - if (i & 0x1) { - q->pre_coef1[i] = (r1 + r2) * sqrt(2.0); - q->pre_coef2[i] = -(r1 - r2) * sqrt(2.0); - } else { - q->pre_coef1[i] = -(r1 + r2) * sqrt(2.0); - q->pre_coef2[i] = (r1 - r2) * sqrt(2.0); - } - } - - /* Generate a square root table */ - - for (i = 0; i < 30; i++) - q->sqrt_tab[i] = sqrt(i); - - /* initialize the VLC tables */ - for (i = 0; i < 4 ; i++) { - for (j = 0; j < 4; j++) { - huffman_vlc[i][j].table = &vlc_tables[vlc_offsets[i * 4 + j]]; - huffman_vlc[i][j].table_allocated = vlc_offsets[i * 4 + j + 1] - vlc_offsets[i * 4 + j]; - init_vlc(&huffman_vlc[i][j], 9, imc_huffman_sizes[i], - imc_huffman_lens[i][j], 1, 1, - imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC); - } - } - - if (avctx->codec_id == AV_CODEC_ID_IAC) { - iac_generate_tabs(q, avctx->sample_rate); - } else { - memcpy(q->cyclTab, cyclTab, sizeof(cyclTab)); - memcpy(q->cyclTab2, cyclTab2, sizeof(cyclTab2)); - memcpy(q->weights1, imc_weights1, sizeof(imc_weights1)); - memcpy(q->weights2, imc_weights2, sizeof(imc_weights2)); - } - - if ((ret = ff_fft_init(&q->fft, 7, 1))) { - av_log(avctx, AV_LOG_INFO, "FFT init failed\n"); - return ret; - } - ff_dsputil_init(&q->dsp, avctx); - avpriv_float_dsp_init(&q->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); - avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; - avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO - : AV_CH_LAYOUT_STEREO; - - return 0; -} - -static void imc_calculate_coeffs(IMCContext *q, float *flcoeffs1, - float *flcoeffs2, int *bandWidthT, - float *flcoeffs3, float *flcoeffs5) -{ - float workT1[BANDS]; - float workT2[BANDS]; - float workT3[BANDS]; - float snr_limit = 1.e-30; - float accum = 0.0; - int i, cnt2; - - for (i = 0; i < BANDS; i++) { - flcoeffs5[i] = workT2[i] = 0.0; - if (bandWidthT[i]) { - workT1[i] = flcoeffs1[i] * flcoeffs1[i]; - flcoeffs3[i] = 2.0 * flcoeffs2[i]; - } else { - workT1[i] = 0.0; - flcoeffs3[i] = -30000.0; - } - workT3[i] = bandWidthT[i] * workT1[i] * 0.01; - if (workT3[i] <= snr_limit) - workT3[i] = 0.0; - } - - for (i = 0; i < BANDS; i++) { - for (cnt2 = i; cnt2 < q->cyclTab[i]; cnt2++) - flcoeffs5[cnt2] = flcoeffs5[cnt2] + workT3[i]; - workT2[cnt2 - 1] = workT2[cnt2 - 1] + workT3[i]; - } - - for (i = 1; i < BANDS; i++) { - accum = (workT2[i - 1] + accum) * q->weights1[i - 1]; - flcoeffs5[i] += accum; - } - - for (i = 0; i < BANDS; i++) - workT2[i] = 0.0; - - for (i = 0; i < BANDS; i++) { - for (cnt2 = i - 1; cnt2 > q->cyclTab2[i]; cnt2--) - flcoeffs5[cnt2] += workT3[i]; - workT2[cnt2+1] += workT3[i]; - } - - accum = 0.0; - - for (i = BANDS-2; i >= 0; i--) { - accum = (workT2[i+1] + accum) * q->weights2[i]; - flcoeffs5[i] += accum; - // there is missing code here, but it seems to never be triggered - } -} - - -static void imc_read_level_coeffs(IMCContext *q, int stream_format_code, - int *levlCoeffs) -{ - int i; - VLC *hufftab[4]; - int start = 0; - const uint8_t *cb_sel; - int s; - - s = stream_format_code >> 1; - hufftab[0] = &huffman_vlc[s][0]; - hufftab[1] = &huffman_vlc[s][1]; - hufftab[2] = &huffman_vlc[s][2]; - hufftab[3] = &huffman_vlc[s][3]; - cb_sel = imc_cb_select[s]; - - if (stream_format_code & 4) - start = 1; - if (start) - levlCoeffs[0] = get_bits(&q->gb, 7); - for (i = start; i < BANDS; i++) { - levlCoeffs[i] = get_vlc2(&q->gb, hufftab[cb_sel[i]]->table, - hufftab[cb_sel[i]]->bits, 2); - if (levlCoeffs[i] == 17) - levlCoeffs[i] += get_bits(&q->gb, 4); - } -} - -static void imc_read_level_coeffs_raw(IMCContext *q, int stream_format_code, - int *levlCoeffs) -{ - int i; - - q->coef0_pos = get_bits(&q->gb, 5); - levlCoeffs[0] = get_bits(&q->gb, 7); - for (i = 1; i < BANDS; i++) - levlCoeffs[i] = get_bits(&q->gb, 4); -} - -static void imc_decode_level_coefficients(IMCContext *q, int *levlCoeffBuf, - float *flcoeffs1, float *flcoeffs2) -{ - int i, level; - float tmp, tmp2; - // maybe some frequency division thingy - - flcoeffs1[0] = 20000.0 / exp2 (levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125 - flcoeffs2[0] = log2f(flcoeffs1[0]); - tmp = flcoeffs1[0]; - tmp2 = flcoeffs2[0]; - - for (i = 1; i < BANDS; i++) { - level = levlCoeffBuf[i]; - if (level == 16) { - flcoeffs1[i] = 1.0; - flcoeffs2[i] = 0.0; - } else { - if (level < 17) - level -= 7; - else if (level <= 24) - level -= 32; - else - level -= 16; - - tmp *= imc_exp_tab[15 + level]; - tmp2 += 0.83048 * level; // 0.83048 = log2(10) * 0.25 - flcoeffs1[i] = tmp; - flcoeffs2[i] = tmp2; - } - } -} - - -static void imc_decode_level_coefficients2(IMCContext *q, int *levlCoeffBuf, - float *old_floor, float *flcoeffs1, - float *flcoeffs2) -{ - int i; - /* FIXME maybe flag_buf = noise coding and flcoeffs1 = new scale factors - * and flcoeffs2 old scale factors - * might be incomplete due to a missing table that is in the binary code - */ - for (i = 0; i < BANDS; i++) { - flcoeffs1[i] = 0; - if (levlCoeffBuf[i] < 16) { - flcoeffs1[i] = imc_exp_tab2[levlCoeffBuf[i]] * old_floor[i]; - flcoeffs2[i] = (levlCoeffBuf[i] - 7) * 0.83048 + flcoeffs2[i]; // 0.83048 = log2(10) * 0.25 - } else { - flcoeffs1[i] = old_floor[i]; - } - } -} - -static void imc_decode_level_coefficients_raw(IMCContext *q, int *levlCoeffBuf, - float *flcoeffs1, float *flcoeffs2) -{ - int i, level, pos; - float tmp, tmp2; - - pos = q->coef0_pos; - flcoeffs1[pos] = 20000.0 / pow (2, levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125 - flcoeffs2[pos] = log2f(flcoeffs1[0]); - tmp = flcoeffs1[pos]; - tmp2 = flcoeffs2[pos]; - - levlCoeffBuf++; - for (i = 0; i < BANDS; i++) { - if (i == pos) - continue; - level = *levlCoeffBuf++; - flcoeffs1[i] = tmp * powf(10.0, -level * 0.4375); //todo tab - flcoeffs2[i] = tmp2 - 1.4533435415 * level; // 1.4533435415 = log2(10) * 0.4375 - } -} - -/** - * Perform bit allocation depending on bits available - */ -static int bit_allocation(IMCContext *q, IMCChannel *chctx, - int stream_format_code, int freebits, int flag) -{ - int i, j; - const float limit = -1.e20; - float highest = 0.0; - int indx; - int t1 = 0; - int t2 = 1; - float summa = 0.0; - int iacc = 0; - int summer = 0; - int rres, cwlen; - float lowest = 1.e10; - int low_indx = 0; - float workT[32]; - int flg; - int found_indx = 0; - - for (i = 0; i < BANDS; i++) - highest = FFMAX(highest, chctx->flcoeffs1[i]); - - for (i = 0; i < BANDS - 1; i++) { - if (chctx->flcoeffs5[i] <= 0) { - av_log(NULL, AV_LOG_ERROR, "flcoeffs5 %f invalid\n", chctx->flcoeffs5[i]); - return AVERROR_INVALIDDATA; - } - chctx->flcoeffs4[i] = chctx->flcoeffs3[i] - log2f(chctx->flcoeffs5[i]); - } - chctx->flcoeffs4[BANDS - 1] = limit; - - highest = highest * 0.25; - - for (i = 0; i < BANDS; i++) { - indx = -1; - if ((band_tab[i + 1] - band_tab[i]) == chctx->bandWidthT[i]) - indx = 0; - - if ((band_tab[i + 1] - band_tab[i]) > chctx->bandWidthT[i]) - indx = 1; - - if (((band_tab[i + 1] - band_tab[i]) / 2) >= chctx->bandWidthT[i]) - indx = 2; - - if (indx == -1) - return AVERROR_INVALIDDATA; - - chctx->flcoeffs4[i] += xTab[(indx * 2 + (chctx->flcoeffs1[i] < highest)) * 2 + flag]; - } - - if (stream_format_code & 0x2) { - chctx->flcoeffs4[0] = limit; - chctx->flcoeffs4[1] = limit; - chctx->flcoeffs4[2] = limit; - chctx->flcoeffs4[3] = limit; - } - - for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS - 1; i++) { - iacc += chctx->bandWidthT[i]; - summa += chctx->bandWidthT[i] * chctx->flcoeffs4[i]; - } - - if (!iacc) - return AVERROR_INVALIDDATA; - - chctx->bandWidthT[BANDS - 1] = 0; - summa = (summa * 0.5 - freebits) / iacc; - - - for (i = 0; i < BANDS / 2; i++) { - rres = summer - freebits; - if ((rres >= -8) && (rres <= 8)) - break; - - summer = 0; - iacc = 0; - - for (j = (stream_format_code & 0x2) ? 4 : 0; j < BANDS; j++) { - cwlen = av_clipf(((chctx->flcoeffs4[j] * 0.5) - summa + 0.5), 0, 6); - - chctx->bitsBandT[j] = cwlen; - summer += chctx->bandWidthT[j] * cwlen; - - if (cwlen > 0) - iacc += chctx->bandWidthT[j]; - } - - flg = t2; - t2 = 1; - if (freebits < summer) - t2 = -1; - if (i == 0) - flg = t2; - if (flg != t2) - t1++; - - summa = (float)(summer - freebits) / ((t1 + 1) * iacc) + summa; - } - - for (i = (stream_format_code & 0x2) ? 4 : 0; i < BANDS; i++) { - for (j = band_tab[i]; j < band_tab[i + 1]; j++) - chctx->CWlengthT[j] = chctx->bitsBandT[i]; - } - - if (freebits > summer) { - for (i = 0; i < BANDS; i++) { - workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20 - : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415); - } - - highest = 0.0; - - do { - if (highest <= -1.e20) - break; - - found_indx = 0; - highest = -1.e20; - - for (i = 0; i < BANDS; i++) { - if (workT[i] > highest) { - highest = workT[i]; - found_indx = i; - } - } - - if (highest > -1.e20) { - workT[found_indx] -= 2.0; - if (++chctx->bitsBandT[found_indx] == 6) - workT[found_indx] = -1.e20; - - for (j = band_tab[found_indx]; j < band_tab[found_indx + 1] && (freebits > summer); j++) { - chctx->CWlengthT[j]++; - summer++; - } - } - } while (freebits > summer); - } - if (freebits < summer) { - for (i = 0; i < BANDS; i++) { - workT[i] = chctx->bitsBandT[i] ? (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] + 1.585) - : 1.e20; - } - if (stream_format_code & 0x2) { - workT[0] = 1.e20; - workT[1] = 1.e20; - workT[2] = 1.e20; - workT[3] = 1.e20; - } - while (freebits < summer) { - lowest = 1.e10; - low_indx = 0; - for (i = 0; i < BANDS; i++) { - if (workT[i] < lowest) { - lowest = workT[i]; - low_indx = i; - } - } - // if (lowest >= 1.e10) - // break; - workT[low_indx] = lowest + 2.0; - - if (!--chctx->bitsBandT[low_indx]) - workT[low_indx] = 1.e20; - - for (j = band_tab[low_indx]; j < band_tab[low_indx+1] && (freebits < summer); j++) { - if (chctx->CWlengthT[j] > 0) { - chctx->CWlengthT[j]--; - summer--; - } - } - } - } - return 0; -} - -static void imc_get_skip_coeff(IMCContext *q, IMCChannel *chctx) -{ - int i, j; - - memset(chctx->skipFlagBits, 0, sizeof(chctx->skipFlagBits)); - memset(chctx->skipFlagCount, 0, sizeof(chctx->skipFlagCount)); - for (i = 0; i < BANDS; i++) { - if (!chctx->bandFlagsBuf[i] || !chctx->bandWidthT[i]) - continue; - - if (!chctx->skipFlagRaw[i]) { - chctx->skipFlagBits[i] = band_tab[i + 1] - band_tab[i]; - - for (j = band_tab[i]; j < band_tab[i + 1]; j++) { - chctx->skipFlags[j] = get_bits1(&q->gb); - if (chctx->skipFlags[j]) - chctx->skipFlagCount[i]++; - } - } else { - for (j = band_tab[i]; j < band_tab[i + 1] - 1; j += 2) { - if (!get_bits1(&q->gb)) { // 0 - chctx->skipFlagBits[i]++; - chctx->skipFlags[j] = 1; - chctx->skipFlags[j + 1] = 1; - chctx->skipFlagCount[i] += 2; - } else { - if (get_bits1(&q->gb)) { // 11 - chctx->skipFlagBits[i] += 2; - chctx->skipFlags[j] = 0; - chctx->skipFlags[j + 1] = 1; - chctx->skipFlagCount[i]++; - } else { - chctx->skipFlagBits[i] += 3; - chctx->skipFlags[j + 1] = 0; - if (!get_bits1(&q->gb)) { // 100 - chctx->skipFlags[j] = 1; - chctx->skipFlagCount[i]++; - } else { // 101 - chctx->skipFlags[j] = 0; - } - } - } - } - - if (j < band_tab[i + 1]) { - chctx->skipFlagBits[i]++; - if ((chctx->skipFlags[j] = get_bits1(&q->gb))) - chctx->skipFlagCount[i]++; - } - } - } -} - -/** - * Increase highest' band coefficient sizes as some bits won't be used - */ -static void imc_adjust_bit_allocation(IMCContext *q, IMCChannel *chctx, - int summer) -{ - float workT[32]; - int corrected = 0; - int i, j; - float highest = 0; - int found_indx = 0; - - for (i = 0; i < BANDS; i++) { - workT[i] = (chctx->bitsBandT[i] == 6) ? -1.e20 - : (chctx->bitsBandT[i] * -2 + chctx->flcoeffs4[i] - 0.415); - } - - while (corrected < summer) { - if (highest <= -1.e20) - break; - - highest = -1.e20; - - for (i = 0; i < BANDS; i++) { - if (workT[i] > highest) { - highest = workT[i]; - found_indx = i; - } - } - - if (highest > -1.e20) { - workT[found_indx] -= 2.0; - if (++(chctx->bitsBandT[found_indx]) == 6) - workT[found_indx] = -1.e20; - - for (j = band_tab[found_indx]; j < band_tab[found_indx+1] && (corrected < summer); j++) { - if (!chctx->skipFlags[j] && (chctx->CWlengthT[j] < 6)) { - chctx->CWlengthT[j]++; - corrected++; - } - } - } - } -} - -static void imc_imdct256(IMCContext *q, IMCChannel *chctx, int channels) -{ - int i; - float re, im; - float *dst1 = q->out_samples; - float *dst2 = q->out_samples + (COEFFS - 1); - - /* prerotation */ - for (i = 0; i < COEFFS / 2; i++) { - q->samples[i].re = -(q->pre_coef1[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) - - (q->pre_coef2[i] * chctx->CWdecoded[i * 2]); - q->samples[i].im = (q->pre_coef2[i] * chctx->CWdecoded[COEFFS - 1 - i * 2]) - - (q->pre_coef1[i] * chctx->CWdecoded[i * 2]); - } - - /* FFT */ - q->fft.fft_permute(&q->fft, q->samples); - q->fft.fft_calc(&q->fft, q->samples); - - /* postrotation, window and reorder */ - for (i = 0; i < COEFFS / 2; i++) { - re = ( q->samples[i].re * q->post_cos[i]) + (-q->samples[i].im * q->post_sin[i]); - im = (-q->samples[i].im * q->post_cos[i]) - ( q->samples[i].re * q->post_sin[i]); - *dst1 = (q->mdct_sine_window[COEFFS - 1 - i * 2] * chctx->last_fft_im[i]) - + (q->mdct_sine_window[i * 2] * re); - *dst2 = (q->mdct_sine_window[i * 2] * chctx->last_fft_im[i]) - - (q->mdct_sine_window[COEFFS - 1 - i * 2] * re); - dst1 += 2; - dst2 -= 2; - chctx->last_fft_im[i] = im; - } -} - -static int inverse_quant_coeff(IMCContext *q, IMCChannel *chctx, - int stream_format_code) -{ - int i, j; - int middle_value, cw_len, max_size; - const float *quantizer; - - for (i = 0; i < BANDS; i++) { - for (j = band_tab[i]; j < band_tab[i + 1]; j++) { - chctx->CWdecoded[j] = 0; - cw_len = chctx->CWlengthT[j]; - - if (cw_len <= 0 || chctx->skipFlags[j]) - continue; - - max_size = 1 << cw_len; - middle_value = max_size >> 1; - - if (chctx->codewords[j] >= max_size || chctx->codewords[j] < 0) - return AVERROR_INVALIDDATA; - - if (cw_len >= 4) { - quantizer = imc_quantizer2[(stream_format_code & 2) >> 1]; - if (chctx->codewords[j] >= middle_value) - chctx->CWdecoded[j] = quantizer[chctx->codewords[j] - 8] * chctx->flcoeffs6[i]; - else - chctx->CWdecoded[j] = -quantizer[max_size - chctx->codewords[j] - 8 - 1] * chctx->flcoeffs6[i]; - }else{ - quantizer = imc_quantizer1[((stream_format_code & 2) >> 1) | (chctx->bandFlagsBuf[i] << 1)]; - if (chctx->codewords[j] >= middle_value) - chctx->CWdecoded[j] = quantizer[chctx->codewords[j] - 1] * chctx->flcoeffs6[i]; - else - chctx->CWdecoded[j] = -quantizer[max_size - 2 - chctx->codewords[j]] * chctx->flcoeffs6[i]; - } - } - } - return 0; -} - - -static int imc_get_coeffs(IMCContext *q, IMCChannel *chctx) -{ - int i, j, cw_len, cw; - - for (i = 0; i < BANDS; i++) { - if (!chctx->sumLenArr[i]) - continue; - if (chctx->bandFlagsBuf[i] || chctx->bandWidthT[i]) { - for (j = band_tab[i]; j < band_tab[i + 1]; j++) { - cw_len = chctx->CWlengthT[j]; - cw = 0; - - if (get_bits_count(&q->gb) + cw_len > 512) { - av_dlog(NULL, "Band %i coeff %i cw_len %i\n", i, j, cw_len); - return AVERROR_INVALIDDATA; - } - - if (cw_len && (!chctx->bandFlagsBuf[i] || !chctx->skipFlags[j])) - cw = get_bits(&q->gb, cw_len); - - chctx->codewords[j] = cw; - } - } - } - return 0; -} - -static void imc_refine_bit_allocation(IMCContext *q, IMCChannel *chctx) -{ - int i, j; - int bits, summer; - - for (i = 0; i < BANDS; i++) { - chctx->sumLenArr[i] = 0; - chctx->skipFlagRaw[i] = 0; - for (j = band_tab[i]; j < band_tab[i + 1]; j++) - chctx->sumLenArr[i] += chctx->CWlengthT[j]; - if (chctx->bandFlagsBuf[i]) - if ((((band_tab[i + 1] - band_tab[i]) * 1.5) > chctx->sumLenArr[i]) && (chctx->sumLenArr[i] > 0)) - chctx->skipFlagRaw[i] = 1; - } - - imc_get_skip_coeff(q, chctx); - - for (i = 0; i < BANDS; i++) { - chctx->flcoeffs6[i] = chctx->flcoeffs1[i]; - /* band has flag set and at least one coded coefficient */ - if (chctx->bandFlagsBuf[i] && (band_tab[i + 1] - band_tab[i]) != chctx->skipFlagCount[i]) { - chctx->flcoeffs6[i] *= q->sqrt_tab[ band_tab[i + 1] - band_tab[i]] / - q->sqrt_tab[(band_tab[i + 1] - band_tab[i] - chctx->skipFlagCount[i])]; - } - } - - /* calculate bits left, bits needed and adjust bit allocation */ - bits = summer = 0; - - for (i = 0; i < BANDS; i++) { - if (chctx->bandFlagsBuf[i]) { - for (j = band_tab[i]; j < band_tab[i + 1]; j++) { - if (chctx->skipFlags[j]) { - summer += chctx->CWlengthT[j]; - chctx->CWlengthT[j] = 0; - } - } - bits += chctx->skipFlagBits[i]; - summer -= chctx->skipFlagBits[i]; - } - } - imc_adjust_bit_allocation(q, chctx, summer); -} - -static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch) -{ - int stream_format_code; - int imc_hdr, i, j, ret; - int flag; - int bits; - int counter, bitscount; - IMCChannel *chctx = q->chctx + ch; - - - /* Check the frame header */ - imc_hdr = get_bits(&q->gb, 9); - if (imc_hdr & 0x18) { - av_log(avctx, AV_LOG_ERROR, "frame header check failed!\n"); - av_log(avctx, AV_LOG_ERROR, "got %X.\n", imc_hdr); - return AVERROR_INVALIDDATA; - } - stream_format_code = get_bits(&q->gb, 3); - - if (stream_format_code & 0x04) - chctx->decoder_reset = 1; - - if (chctx->decoder_reset) { - for (i = 0; i < BANDS; i++) - chctx->old_floor[i] = 1.0; - for (i = 0; i < COEFFS; i++) - chctx->CWdecoded[i] = 0; - chctx->decoder_reset = 0; - } - - flag = get_bits1(&q->gb); - if (stream_format_code & 0x1) - imc_decode_level_coefficients_raw(q, chctx->levlCoeffBuf, - chctx->flcoeffs1, chctx->flcoeffs2); - else if (stream_format_code & 0x1) - imc_read_level_coeffs_raw(q, stream_format_code, chctx->levlCoeffBuf); - else - imc_read_level_coeffs(q, stream_format_code, chctx->levlCoeffBuf); - - if (stream_format_code & 0x4) - imc_decode_level_coefficients(q, chctx->levlCoeffBuf, - chctx->flcoeffs1, chctx->flcoeffs2); - else - imc_decode_level_coefficients2(q, chctx->levlCoeffBuf, chctx->old_floor, - chctx->flcoeffs1, chctx->flcoeffs2); - - for(i=0; iflcoeffs1[i] > INT_MAX) { - av_log(avctx, AV_LOG_ERROR, "scalefactor out of range\n"); - return AVERROR_INVALIDDATA; - } - } - - memcpy(chctx->old_floor, chctx->flcoeffs1, 32 * sizeof(float)); - - counter = 0; - if (stream_format_code & 0x1) { - for (i = 0; i < BANDS; i++) { - chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i]; - chctx->bandFlagsBuf[i] = 0; - chctx->flcoeffs3[i] = chctx->flcoeffs2[i] * 2; - chctx->flcoeffs5[i] = 1.0; - } - } else { - for (i = 0; i < BANDS; i++) { - if (chctx->levlCoeffBuf[i] == 16) { - chctx->bandWidthT[i] = 0; - counter++; - } else - chctx->bandWidthT[i] = band_tab[i + 1] - band_tab[i]; - } - - memset(chctx->bandFlagsBuf, 0, BANDS * sizeof(int)); - for (i = 0; i < BANDS - 1; i++) - if (chctx->bandWidthT[i]) - chctx->bandFlagsBuf[i] = get_bits1(&q->gb); - - imc_calculate_coeffs(q, chctx->flcoeffs1, chctx->flcoeffs2, - chctx->bandWidthT, chctx->flcoeffs3, - chctx->flcoeffs5); - } - - bitscount = 0; - /* first 4 bands will be assigned 5 bits per coefficient */ - if (stream_format_code & 0x2) { - bitscount += 15; - - chctx->bitsBandT[0] = 5; - chctx->CWlengthT[0] = 5; - chctx->CWlengthT[1] = 5; - chctx->CWlengthT[2] = 5; - for (i = 1; i < 4; i++) { - if (stream_format_code & 0x1) - bits = 5; - else - bits = (chctx->levlCoeffBuf[i] == 16) ? 0 : 5; - chctx->bitsBandT[i] = bits; - for (j = band_tab[i]; j < band_tab[i + 1]; j++) { - chctx->CWlengthT[j] = bits; - bitscount += bits; - } - } - } - if (avctx->codec_id == AV_CODEC_ID_IAC) { - bitscount += !!chctx->bandWidthT[BANDS - 1]; - if (!(stream_format_code & 0x2)) - bitscount += 16; - } - - if ((ret = bit_allocation(q, chctx, stream_format_code, - 512 - bitscount - get_bits_count(&q->gb), - flag)) < 0) { - av_log(avctx, AV_LOG_ERROR, "Bit allocations failed\n"); - chctx->decoder_reset = 1; - return ret; - } - - if (stream_format_code & 0x1) { - for (i = 0; i < BANDS; i++) - chctx->skipFlags[i] = 0; - } else { - imc_refine_bit_allocation(q, chctx); - } - - for (i = 0; i < BANDS; i++) { - chctx->sumLenArr[i] = 0; - - for (j = band_tab[i]; j < band_tab[i + 1]; j++) - if (!chctx->skipFlags[j]) - chctx->sumLenArr[i] += chctx->CWlengthT[j]; - } - - memset(chctx->codewords, 0, sizeof(chctx->codewords)); - - if (imc_get_coeffs(q, chctx) < 0) { - av_log(avctx, AV_LOG_ERROR, "Read coefficients failed\n"); - chctx->decoder_reset = 1; - return AVERROR_INVALIDDATA; - } - - if (inverse_quant_coeff(q, chctx, stream_format_code) < 0) { - av_log(avctx, AV_LOG_ERROR, "Inverse quantization of coefficients failed\n"); - chctx->decoder_reset = 1; - return AVERROR_INVALIDDATA; - } - - memset(chctx->skipFlags, 0, sizeof(chctx->skipFlags)); - - imc_imdct256(q, chctx, avctx->channels); - - return 0; -} - -static int imc_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame_ptr, AVPacket *avpkt) -{ - AVFrame *frame = data; - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - int ret, i; - - IMCContext *q = avctx->priv_data; - - LOCAL_ALIGNED_16(uint16_t, buf16, [IMC_BLOCK_SIZE / 2]); - - if (buf_size < IMC_BLOCK_SIZE * avctx->channels) { - av_log(avctx, AV_LOG_ERROR, "frame too small!\n"); - return AVERROR_INVALIDDATA; - } - - /* get output buffer */ - frame->nb_samples = COEFFS; - if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) - return ret; - - for (i = 0; i < avctx->channels; i++) { - q->out_samples = (float *)frame->extended_data[i]; - - q->dsp.bswap16_buf(buf16, (const uint16_t*)buf, IMC_BLOCK_SIZE / 2); - - init_get_bits(&q->gb, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8); - - buf += IMC_BLOCK_SIZE; - - if ((ret = imc_decode_block(avctx, q, i)) < 0) - return ret; - } - - if (avctx->channels == 2) { - q->fdsp.butterflies_float((float *)frame->extended_data[0], - (float *)frame->extended_data[1], COEFFS); - } - - *got_frame_ptr = 1; - - return IMC_BLOCK_SIZE * avctx->channels; -} - - -static av_cold int imc_decode_close(AVCodecContext * avctx) -{ - IMCContext *q = avctx->priv_data; - - ff_fft_end(&q->fft); - - return 0; -} - -static av_cold void flush(AVCodecContext *avctx) -{ - IMCContext *q = avctx->priv_data; - - q->chctx[0].decoder_reset = - q->chctx[1].decoder_reset = 1; -} - -#if CONFIG_IMC_DECODER -AVCodec ff_imc_decoder = { - .name = "imc", - .long_name = NULL_IF_CONFIG_SMALL("IMC (Intel Music Coder)"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_IMC, - .priv_data_size = sizeof(IMCContext), - .init = imc_decode_init, - .close = imc_decode_close, - .decode = imc_decode_frame, - .flush = flush, - .capabilities = CODEC_CAP_DR1, - .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, - AV_SAMPLE_FMT_NONE }, -}; -#endif -#if CONFIG_IAC_DECODER -AVCodec ff_iac_decoder = { - .name = "iac", - .long_name = NULL_IF_CONFIG_SMALL("IAC (Indeo Audio Coder)"), - .type = AVMEDIA_TYPE_AUDIO, - .id = AV_CODEC_ID_IAC, - .priv_data_size = sizeof(IMCContext), - .init = imc_decode_init, - .close = imc_decode_close, - .decode = imc_decode_frame, - .flush = flush, - .capabilities = CODEC_CAP_DR1, - .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, - AV_SAMPLE_FMT_NONE }, -}; -#endif -- cgit v1.2.3