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-rw-r--r--contrib/ffmpeg/libavcodec/imc.c813
1 files changed, 0 insertions, 813 deletions
diff --git a/contrib/ffmpeg/libavcodec/imc.c b/contrib/ffmpeg/libavcodec/imc.c
deleted file mode 100644
index 6140130b1..000000000
--- a/contrib/ffmpeg/libavcodec/imc.c
+++ /dev/null
@@ -1,813 +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.c IMC - Intel Music Coder
- * A mdct based codec using a 256 points large transform
- * divied into 32 bands with some mix of scale factors.
- * Only mono is supported.
- *
- */
-
-
-#include <math.h>
-#include <stddef.h>
-#include <stdio.h>
-
-#define ALT_BITSTREAM_READER
-#include "avcodec.h"
-#include "bitstream.h"
-#include "dsputil.h"
-
-#include "imcdata.h"
-
-#define IMC_FRAME_ID 0x21
-#define BANDS 32
-#define COEFFS 256
-
-typedef struct {
- 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];
-
- /** MDCT tables */
- //@{
- float mdct_sine_window[COEFFS];
- float post_cos[COEFFS];
- float post_sin[COEFFS];
- float pre_coef1[COEFFS];
- float pre_coef2[COEFFS];
- float last_fft_im[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 sqrt_tab[30];
- GetBitContext gb;
- VLC huffman_vlc[4][4];
- int decoder_reset;
- float one_div_log2;
-
- DSPContext dsp;
- FFTContext fft;
- DECLARE_ALIGNED_16(FFTComplex, samples[COEFFS/2]);
- DECLARE_ALIGNED_16(float, out_samples[COEFFS]);
-} IMCContext;
-
-
-static int imc_decode_init(AVCodecContext * avctx)
-{
- int i, j;
- IMCContext *q = avctx->priv_data;
- double r1, r2;
-
- q->decoder_reset = 1;
-
- for(i = 0; i < BANDS; i++)
- q->old_floor[i] = 1.0;
-
- /* Build mdct window, a simple sine window normalized with sqrt(2) */
- for(i = 0; i < COEFFS; i++)
- q->mdct_sine_window[i] = sin((i + 0.5) / 512.0 * M_PI) * sqrt(2.0);
- for(i = 0; i < COEFFS/2; i++){
- q->post_cos[i] = cos(i / 256.0 * M_PI);
- q->post_sin[i] = 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);
- }
-
- q->last_fft_im[i] = 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++) {
- init_vlc (&q->huffman_vlc[i][j], 9, imc_huffman_sizes[i],
- imc_huffman_lens[i][j], 1, 1,
- imc_huffman_bits[i][j], 2, 2, 1);
- }
- }
- q->one_div_log2 = 1/log(2);
-
- ff_fft_init(&q->fft, 7, 1);
- dsputil_init(&q->dsp, avctx);
- 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 < 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) * imc_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 > 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) * imc_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] = &q->huffman_vlc[s][0];
- hufftab[1] = &q->huffman_vlc[s][1];
- hufftab[2] = &q->huffman_vlc[s][2];
- hufftab[3] = &q->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_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 / pow (2, levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125
- flcoeffs2[0] = log(flcoeffs1[0])/log(2);
- 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];
- }
- }
-}
-
-/**
- * Perform bit allocation depending on bits available
- */
-static int bit_allocation (IMCContext* q, 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, q->flcoeffs1[i]);
-
- for(i = 0; i < BANDS-1; i++) {
- q->flcoeffs4[i] = q->flcoeffs3[i] - log(q->flcoeffs5[i])/log(2);
- }
- q->flcoeffs4[BANDS - 1] = limit;
-
- highest = highest * 0.25;
-
- for(i = 0; i < BANDS; i++) {
- indx = -1;
- if ((band_tab[i+1] - band_tab[i]) == q->bandWidthT[i])
- indx = 0;
-
- if ((band_tab[i+1] - band_tab[i]) > q->bandWidthT[i])
- indx = 1;
-
- if (((band_tab[i+1] - band_tab[i])/2) >= q->bandWidthT[i])
- indx = 2;
-
- if (indx == -1)
- return -1;
-
- q->flcoeffs4[i] = q->flcoeffs4[i] + xTab[(indx*2 + (q->flcoeffs1[i] < highest)) * 2 + flag];
- }
-
- if (stream_format_code & 0x2) {
- q->flcoeffs4[0] = limit;
- q->flcoeffs4[1] = limit;
- q->flcoeffs4[2] = limit;
- q->flcoeffs4[3] = limit;
- }
-
- for(i = (stream_format_code & 0x2)?4:0; i < BANDS-1; i++) {
- iacc += q->bandWidthT[i];
- summa += q->bandWidthT[i] * q->flcoeffs4[i];
- }
- q->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_clip((int)((q->flcoeffs4[j] * 0.5) - summa + 0.5), 0, 6);
-
- q->bitsBandT[j] = cwlen;
- summer += q->bandWidthT[j] * cwlen;
-
- if (cwlen > 0)
- iacc += q->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++)
- q->CWlengthT[j] = q->bitsBandT[i];
- }
-
- if (freebits > summer) {
- for(i = 0; i < BANDS; i++) {
- workT[i] = (q->bitsBandT[i] == 6) ? -1.e20 : (q->bitsBandT[i] * -2 + q->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 (++(q->bitsBandT[found_indx]) == 6)
- workT[found_indx] = -1.e20;
-
- for(j = band_tab[found_indx]; j < band_tab[found_indx+1] && (freebits > summer); j++){
- q->CWlengthT[j]++;
- summer++;
- }
- }
- }while (freebits > summer);
- }
- if (freebits < summer) {
- for(i = 0; i < BANDS; i++) {
- workT[i] = q->bitsBandT[i] ? (q->bitsBandT[i] * -2 + q->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 (!(--q->bitsBandT[low_indx]))
- workT[low_indx] = 1.e20;
-
- for(j = band_tab[low_indx]; j < band_tab[low_indx+1] && (freebits < summer); j++){
- if(q->CWlengthT[j] > 0){
- q->CWlengthT[j]--;
- summer--;
- }
- }
- }
- }
- return 0;
-}
-
-static void imc_get_skip_coeff(IMCContext* q) {
- int i, j;
-
- memset(q->skipFlagBits, 0, sizeof(q->skipFlagBits));
- memset(q->skipFlagCount, 0, sizeof(q->skipFlagCount));
- for(i = 0; i < BANDS; i++) {
- if (!q->bandFlagsBuf[i] || !q->bandWidthT[i])
- continue;
-
- if (!q->skipFlagRaw[i]) {
- q->skipFlagBits[i] = band_tab[i+1] - band_tab[i];
-
- for(j = band_tab[i]; j < band_tab[i+1]; j++) {
- if ((q->skipFlags[j] = get_bits(&q->gb,1)))
- q->skipFlagCount[i]++;
- }
- } else {
- for(j = band_tab[i]; j < (band_tab[i+1]-1); j += 2) {
- if(!get_bits1(&q->gb)){//0
- q->skipFlagBits[i]++;
- q->skipFlags[j]=1;
- q->skipFlags[j+1]=1;
- q->skipFlagCount[i] += 2;
- }else{
- if(get_bits1(&q->gb)){//11
- q->skipFlagBits[i] +=2;
- q->skipFlags[j]=0;
- q->skipFlags[j+1]=1;
- q->skipFlagCount[i]++;
- }else{
- q->skipFlagBits[i] +=3;
- q->skipFlags[j+1]=0;
- if(!get_bits1(&q->gb)){//100
- q->skipFlags[j]=1;
- q->skipFlagCount[i]++;
- }else{//101
- q->skipFlags[j]=0;
- }
- }
- }
- }
-
- if (j < band_tab[i+1]) {
- q->skipFlagBits[i]++;
- if ((q->skipFlags[j] = get_bits(&q->gb,1)))
- q->skipFlagCount[i]++;
- }
- }
- }
-}
-
-/**
- * Increase highest' band coefficient sizes as some bits won't be used
- */
-static void imc_adjust_bit_allocation (IMCContext* q, 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] = (q->bitsBandT[i] == 6) ? -1.e20 : (q->bitsBandT[i] * -2 + q->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 (++(q->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 (!q->skipFlags[j] && (q->CWlengthT[j] < 6)) {
- q->CWlengthT[j]++;
- corrected++;
- }
- }
- }
- }
-}
-
-static void imc_imdct256(IMCContext *q) {
- int i;
- float re, im;
-
- /* prerotation */
- for(i=0; i < COEFFS/2; i++){
- q->samples[i].re = -(q->pre_coef1[i] * q->CWdecoded[COEFFS-1-i*2]) -
- (q->pre_coef2[i] * q->CWdecoded[i*2]);
- q->samples[i].im = (q->pre_coef2[i] * q->CWdecoded[COEFFS-1-i*2]) -
- (q->pre_coef1[i] * q->CWdecoded[i*2]);
- }
-
- /* FFT */
- ff_fft_permute(&q->fft, q->samples);
- ff_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]);
- q->out_samples[i*2] = (q->mdct_sine_window[COEFFS-1-i*2] * q->last_fft_im[i]) + (q->mdct_sine_window[i*2] * re);
- q->out_samples[COEFFS-1-i*2] = (q->mdct_sine_window[i*2] * q->last_fft_im[i]) - (q->mdct_sine_window[COEFFS-1-i*2] * re);
- q->last_fft_im[i] = im;
- }
-}
-
-static int inverse_quant_coeff (IMCContext* q, 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++) {
- q->CWdecoded[j] = 0;
- cw_len = q->CWlengthT[j];
-
- if (cw_len <= 0 || q->skipFlags[j])
- continue;
-
- max_size = 1 << cw_len;
- middle_value = max_size >> 1;
-
- if (q->codewords[j] >= max_size || q->codewords[j] < 0)
- return -1;
-
- if (cw_len >= 4){
- quantizer = imc_quantizer2[(stream_format_code & 2) >> 1];
- if (q->codewords[j] >= middle_value)
- q->CWdecoded[j] = quantizer[q->codewords[j] - 8] * q->flcoeffs6[i];
- else
- q->CWdecoded[j] = -quantizer[max_size - q->codewords[j] - 8 - 1] * q->flcoeffs6[i];
- }else{
- quantizer = imc_quantizer1[((stream_format_code & 2) >> 1) | (q->bandFlagsBuf[i] << 1)];
- if (q->codewords[j] >= middle_value)
- q->CWdecoded[j] = quantizer[q->codewords[j] - 1] * q->flcoeffs6[i];
- else
- q->CWdecoded[j] = -quantizer[max_size - 2 - q->codewords[j]] * q->flcoeffs6[i];
- }
- }
- }
- return 0;
-}
-
-
-static int imc_get_coeffs (IMCContext* q) {
- int i, j, cw_len, cw;
-
- for(i = 0; i < BANDS; i++) {
- if(!q->sumLenArr[i]) continue;
- if (q->bandFlagsBuf[i] || q->bandWidthT[i]) {
- for(j = band_tab[i]; j < band_tab[i+1]; j++) {
- cw_len = q->CWlengthT[j];
- cw = 0;
-
- if (get_bits_count(&q->gb) + cw_len > 512){
-//av_log(NULL,0,"Band %i coeff %i cw_len %i\n",i,j,cw_len);
- return -1;
- }
-
- if(cw_len && (!q->bandFlagsBuf[i] || !q->skipFlags[j]))
- cw = get_bits(&q->gb, cw_len);
-
- q->codewords[j] = cw;
- }
- }
- }
- return 0;
-}
-
-static int imc_decode_frame(AVCodecContext * avctx,
- void *data, int *data_size,
- uint8_t * buf, int buf_size)
-{
-
- IMCContext *q = avctx->priv_data;
-
- int stream_format_code;
- int imc_hdr, i, j;
- int flag;
- int bits, summer;
- int counter, bitscount;
- uint16_t *buf16 = (uint16_t *) buf;
-
- /* FIXME: input should not be modified */
- for(i = 0; i < FFMIN(buf_size, avctx->block_align) / 2; i++)
- buf16[i] = bswap_16(buf16[i]);
-
- init_get_bits(&q->gb, buf, 512);
-
- /* Check the frame header */
- imc_hdr = get_bits(&q->gb, 9);
- if (imc_hdr != IMC_FRAME_ID) {
- av_log(avctx, AV_LOG_ERROR, "imc frame header check failed!\n");
- av_log(avctx, AV_LOG_ERROR, "got %x instead of 0x21.\n", imc_hdr);
- return -1;
- }
- stream_format_code = get_bits(&q->gb, 3);
-
- if(stream_format_code & 1){
- av_log(avctx, AV_LOG_ERROR, "Stream code format %X is not supported\n", stream_format_code);
- return -1;
- }
-
-// av_log(avctx, AV_LOG_DEBUG, "stream_format_code = %d\n", stream_format_code);
-
- if (stream_format_code & 0x04)
- q->decoder_reset = 1;
-
- if(q->decoder_reset) {
- memset(q->out_samples, 0, sizeof(q->out_samples));
- for(i = 0; i < BANDS; i++)q->old_floor[i] = 1.0;
- for(i = 0; i < COEFFS; i++)q->CWdecoded[i] = 0;
- q->decoder_reset = 0;
- }
-
- flag = get_bits1(&q->gb);
- imc_read_level_coeffs(q, stream_format_code, q->levlCoeffBuf);
-
- if (stream_format_code & 0x4)
- imc_decode_level_coefficients(q, q->levlCoeffBuf, q->flcoeffs1, q->flcoeffs2);
- else
- imc_decode_level_coefficients2(q, q->levlCoeffBuf, q->old_floor, q->flcoeffs1, q->flcoeffs2);
-
- memcpy(q->old_floor, q->flcoeffs1, 32 * sizeof(float));
-
- counter = 0;
- for (i=0 ; i<BANDS ; i++) {
- if (q->levlCoeffBuf[i] == 16) {
- q->bandWidthT[i] = 0;
- counter++;
- } else
- q->bandWidthT[i] = band_tab[i+1] - band_tab[i];
- }
- memset(q->bandFlagsBuf, 0, BANDS * sizeof(int));
- for(i = 0; i < BANDS-1; i++) {
- if (q->bandWidthT[i])
- q->bandFlagsBuf[i] = get_bits1(&q->gb);
- }
-
- imc_calculate_coeffs(q, q->flcoeffs1, q->flcoeffs2, q->bandWidthT, q->flcoeffs3, q->flcoeffs5);
-
- bitscount = 0;
- /* first 4 bands will be assigned 5 bits per coefficient */
- if (stream_format_code & 0x2) {
- bitscount += 15;
-
- q->bitsBandT[0] = 5;
- q->CWlengthT[0] = 5;
- q->CWlengthT[1] = 5;
- q->CWlengthT[2] = 5;
- for(i = 1; i < 4; i++){
- bits = (q->levlCoeffBuf[i] == 16) ? 0 : 5;
- q->bitsBandT[i] = bits;
- for(j = band_tab[i]; j < band_tab[i+1]; j++) {
- q->CWlengthT[j] = bits;
- bitscount += bits;
- }
- }
- }
-
- if(bit_allocation (q, stream_format_code, 512 - bitscount - get_bits_count(&q->gb), flag) < 0) {
- av_log(avctx, AV_LOG_ERROR, "Bit allocations failed\n");
- q->decoder_reset = 1;
- return -1;
- }
-
- for(i = 0; i < BANDS; i++) {
- q->sumLenArr[i] = 0;
- q->skipFlagRaw[i] = 0;
- for(j = band_tab[i]; j < band_tab[i+1]; j++)
- q->sumLenArr[i] += q->CWlengthT[j];
- if (q->bandFlagsBuf[i])
- if( (((band_tab[i+1] - band_tab[i]) * 1.5) > q->sumLenArr[i]) && (q->sumLenArr[i] > 0))
- q->skipFlagRaw[i] = 1;
- }
-
- imc_get_skip_coeff(q);
-
- for(i = 0; i < BANDS; i++) {
- q->flcoeffs6[i] = q->flcoeffs1[i];
- /* band has flag set and at least one coded coefficient */
- if (q->bandFlagsBuf[i] && (band_tab[i+1] - band_tab[i]) != q->skipFlagCount[i]){
- q->flcoeffs6[i] *= q->sqrt_tab[band_tab[i+1] - band_tab[i]] /
- q->sqrt_tab[(band_tab[i+1] - band_tab[i] - q->skipFlagCount[i])];
- }
- }
-
- /* calculate bits left, bits needed and adjust bit allocation */
- bits = summer = 0;
-
- for(i = 0; i < BANDS; i++) {
- if (q->bandFlagsBuf[i]) {
- for(j = band_tab[i]; j < band_tab[i+1]; j++) {
- if(q->skipFlags[j]) {
- summer += q->CWlengthT[j];
- q->CWlengthT[j] = 0;
- }
- }
- bits += q->skipFlagBits[i];
- summer -= q->skipFlagBits[i];
- }
- }
- imc_adjust_bit_allocation(q, summer);
-
- for(i = 0; i < BANDS; i++) {
- q->sumLenArr[i] = 0;
-
- for(j = band_tab[i]; j < band_tab[i+1]; j++)
- if (!q->skipFlags[j])
- q->sumLenArr[i] += q->CWlengthT[j];
- }
-
- memset(q->codewords, 0, sizeof(q->codewords));
-
- if(imc_get_coeffs(q) < 0) {
- av_log(avctx, AV_LOG_ERROR, "Read coefficients failed\n");
- q->decoder_reset = 1;
- return 0;
- }
-
- if(inverse_quant_coeff(q, stream_format_code) < 0) {
- av_log(avctx, AV_LOG_ERROR, "Inverse quantization of coefficients failed\n");
- q->decoder_reset = 1;
- return 0;
- }
-
- memset(q->skipFlags, 0, sizeof(q->skipFlags));
-
- imc_imdct256(q);
-
- q->dsp.float_to_int16(data, q->out_samples, COEFFS);
-
- *data_size = COEFFS * sizeof(int16_t);
-
- return avctx->block_align;
-}
-
-
-static int imc_decode_close(AVCodecContext * avctx)
-{
- IMCContext *q = avctx->priv_data;
-
- ff_fft_end(&q->fft);
- return 0;
-}
-
-
-AVCodec imc_decoder = {
- .name = "imc",
- .type = CODEC_TYPE_AUDIO,
- .id = CODEC_ID_IMC,
- .priv_data_size = sizeof(IMCContext),
- .init = imc_decode_init,
- .close = imc_decode_close,
- .decode = imc_decode_frame,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 09:03:30 +0000