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IMC decoder 

Originally committed as revision 6839 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Kostya Shishkov 19 years ago
parent
9c5d7c568b
commit
84ed36da85
8 changed files with 991 additions and 2 deletions
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  1. +1
    -0
      Changelog
  2. +1
    -0
      doc/ffmpeg-doc.texi
  3. +1
    -0
      libavcodec/Makefile
  4. +3
    -0
      libavcodec/allcodecs.c
  5. +4
    -2
      libavcodec/avcodec.h
  6. +816
    -0
      libavcodec/imc.c
  7. +164
    -0
      libavcodec/imcdata.h
  8. +1
    -0
      libavformat/riff.c

+ 1
- 0
Changelog View File

@@ -65,6 +65,7 @@ version <next>
- MTV demuxer
- TIFF picture decoder
- GIF picture decoder
- Intel Music decoder

version 0.4.9-pre1:



+ 1
- 0
doc/ffmpeg-doc.texi View File

@@ -934,6 +934,7 @@ following image formats are supported:
@item WavPack Audio @tab @tab X
@item Cin Audio @tab @tab X
@tab Codec used in Delphine Software games.
@item Intel Music Coder @tab @tab X
@end multitable

@code{X} means that encoding (resp. decoding) is supported.


+ 1
- 0
libavcodec/Makefile View File

@@ -88,6 +88,7 @@ OBJS-$(CONFIG_H264_DECODER) += h264.o
OBJS-$(CONFIG_HUFFYUV_DECODER) += huffyuv.o
OBJS-$(CONFIG_HUFFYUV_ENCODER) += huffyuv.o
OBJS-$(CONFIG_IDCIN_DECODER) += idcinvideo.o
OBJS-$(CONFIG_IMC_DECODER) += imc.o
OBJS-$(CONFIG_INDEO2_DECODER) += indeo2.o
OBJS-$(CONFIG_INDEO3_DECODER) += indeo3.o
OBJS-$(CONFIG_INTERPLAY_VIDEO_DECODER) += interplayvideo.o


+ 3
- 0
libavcodec/allcodecs.c View File

@@ -563,6 +563,9 @@ void avcodec_register_all(void)
#ifdef CONFIG_TIFF_DECODER
register_avcodec(&tiff_decoder);
#endif //CONFIG_TIFF_DECODER
#ifdef CONFIG_IMC_DECODER
register_avcodec(&imc_decoder);
#endif //CONFIG_IMC_DECODER

#if defined(CONFIG_AMR_NB) || defined(CONFIG_AMR_NB_FIXED)
#ifdef CONFIG_AMR_NB_DECODER


+ 4
- 2
libavcodec/avcodec.h View File

@@ -37,8 +37,8 @@ extern "C" {
#define AV_STRINGIFY(s) AV_TOSTRING(s)
#define AV_TOSTRING(s) #s

#define LIBAVCODEC_VERSION_INT ((51<<16)+(22<<8)+0)
#define LIBAVCODEC_VERSION 51.22.0
#define LIBAVCODEC_VERSION_INT ((51<<16)+(23<<8)+0)
#define LIBAVCODEC_VERSION 51.23.0
#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT

#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -233,6 +233,7 @@ enum CodecID {
CODEC_ID_QCELP,
CODEC_ID_WAVPACK,
CODEC_ID_DSICINAUDIO,
CODEC_ID_IMC,

/* subtitle codecs */
CODEC_ID_DVD_SUBTITLE= 0x17000,
@@ -2304,6 +2305,7 @@ extern AVCodec dsicinvideo_decoder;
extern AVCodec dsicinaudio_decoder;
extern AVCodec tiertexseqvideo_decoder;
extern AVCodec tiff_decoder;
extern AVCodec imc_decoder;

/* pcm codecs */
#define PCM_CODEC(id, name) \


+ 816
- 0
libavcodec/imc.c View File

@@ -0,0 +1,816 @@
/*
* 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];
float flcf1, flcf2;
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;
}
q->flcf1 = log2(10) * 0.05703125;
q->flcf2 = log2(10) * 0.25;

/* 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, 0);
}
}
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] * q->flcf1);
flcoeffs2[0] = log2(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 += q->flcf2 * level;
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) * q->flcf2 + flcoeffs2[i];
} 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] - log2(q->flcoeffs5[i]);
}
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 = 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++;
}
}
}
}
}

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,
};

+ 164
- 0
libavcodec/imcdata.h View File

@@ -0,0 +1,164 @@
/*
* 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
*
*/

static const uint16_t band_tab[33] = {
0, 3, 6, 9, 12, 16, 20, 24, 29, 34, 40,
46, 53, 60, 68, 76, 84, 93, 102, 111, 121, 131,
141, 151, 162, 173, 184, 195, 207, 219, 231, 243, 256,
};


static const int8_t cyclTab[32] = {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31, 32, 32,
};

static const int8_t cyclTab2[32] = {
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 28, 29};

static const float imc_weights1[31] = {
0.119595, 0.123124, 0.129192, 9.97377e-2, 8.1923e-2, 9.61153e-2, 8.77885e-2, 8.61174e-2,
9.00882e-2, 9.91658e-2, 0.112991, 0.131126, 0.152886, 0.177292, 0.221782, 0.244917, 0.267386,
0.306816, 0.323046, 0.33729, 0.366773, 0.392557, 0.398076, 0.403302, 0.42451, 0.444777,
0.449188, 0.455445, 0.477853, 0.500669, 0.510395};

static const float imc_weights2[31] = {
3.23466e-3, 3.49886e-3, 3.98413e-3, 1.98116e-3, 1.16465e-3, 1.79283e-3, 1.40372e-3, 1.33274e-3,
1.50523e-3, 1.95064e-3, 2.77472e-3, 4.14725e-3, 6.2776e-3, 9.36401e-3, 1.71397e-2, 2.24052e-2,
2.83971e-2, 4.11689e-2, 4.73165e-2, 5.31631e-2, 6.66614e-2, 8.00824e-2, 8.31588e-2, 8.61397e-2,
9.89229e-2, 0.112197, 0.115227, 0.119613, 0.136174, 0.15445, 0.162685};

static const float imc_quantizer1[4][8] = {
{ 8.4431201e-1, 4.7358301e-1, 1.448354, 2.7073899e-1, 7.4449003e-1, 1.241991, 1.845484, 0.0},
{ 8.6876702e-1, 4.7659001e-1, 1.478224, 2.5672799e-1, 7.55777e-1, 1.3229851, 2.03438, 0.0},
{ 7.5891501e-1, 6.2272799e-1, 1.271322, 3.47904e-1, 7.5317699e-1, 1.150767, 1.628476, 0.0},
{ 7.65257e-1, 6.44647e-1, 1.263824, 3.4548101e-1, 7.6384902e-1, 1.214466, 1.7638789, 0.0},
};

static const float imc_quantizer2[2][56] = {
{ 1.39236e-1, 3.50548e-1, 5.9547901e-1, 8.5772401e-1, 1.121545, 1.3882281, 1.695882, 2.1270809,
7.2221003e-2, 1.85177e-1, 2.9521701e-1, 4.12568e-1, 5.4068601e-1, 6.7679501e-1, 8.1196898e-1, 9.4765198e-1,
1.0779999, 1.203415, 1.337265, 1.481871, 1.639982, 1.814766, 2.0701399, 2.449862,
3.7533998e-2, 1.02722e-1, 1.6021401e-1, 2.16043e-1, 2.7231601e-1, 3.3025399e-1, 3.9022601e-1, 4.52849e-1,
5.1794899e-1, 5.8529502e-1, 6.53956e-1, 7.2312802e-1, 7.9150802e-1, 8.5891002e-1, 9.28141e-1, 9.9706203e-1,
1.062153, 1.12564, 1.189834, 1.256122, 1.324469, 1.3955311, 1.468906, 1.545084,
1.6264729, 1.711524, 1.802705, 1.91023, 2.0533991, 2.22333, 2.4830019, 3.253329 },
{ 1.11654e-1, 3.54469e-1, 6.4232099e-1, 9.6128798e-1, 1.295053, 1.61777, 1.989839, 2.51107,
5.7721999e-2, 1.69879e-1, 2.97589e-1, 4.3858799e-1, 5.9039903e-1, 7.4934798e-1, 9.1628098e-1, 1.087297,
1.262751, 1.4288321, 1.6040879, 1.79067, 2.000668, 2.2394669, 2.649332, 5.2760072,
2.9722e-2, 8.7316997e-2, 1.4445201e-1, 2.04247e-1, 2.6879501e-1, 3.3716801e-1, 4.08811e-1, 4.8306999e-1,
5.6049401e-1, 6.3955498e-1, 7.2044599e-1, 8.0427998e-1, 8.8933599e-1, 9.7537601e-1, 1.062461, 1.1510431,
1.240236, 1.326715, 1.412513, 1.500502, 1.591749, 1.686413, 1.785239, 1.891233,
2.0051291, 2.127681, 2.2709141, 2.475826, 2.7219379, 3.101985, 4.686213, 6.2287788},
};


static const float xTab[14] = {7.6, 3.6, 4.4, 3.7, 6.1, 5.1, 2.3, 1.6, 6.2, 1.5, 1.8, 1.2, 0, 0}; //10014048

/* precomputed table for 10^(i/4), i=-15..16 */
static const float imc_exp_tab[32] = {
1.778280e-4, 3.162278e-4, 5.623413e-4, 1.000000e-3,
1.778280e-3, 3.162278e-3, 5.623413e-3, 1.000000e-2,
1.778280e-2, 3.162278e-2, 5.623413e-2, 1.000000e-1,
1.778280e-1, 3.162278e-1, 5.623413e-1, 1.000000e00,
1.778280e00, 3.162278e00, 5.623413e00, 1.000000e01,
1.778280e01, 3.162278e01, 5.623413e01, 1.000000e02,
1.778280e02, 3.162278e02, 5.623413e02, 1.000000e03,
1.778280e03, 3.162278e03, 5.623413e03, 1.000000e04
};
static const float *imc_exp_tab2 = imc_exp_tab + 8;


static const uint8_t imc_cb_select[4][32] = {
{ 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2 },
{ 0, 2, 0, 3, 2, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
{ 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2 },
{ 0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};

static const uint8_t imc_huffman_sizes[4] = {
17, 17, 18, 18
};

static const uint8_t imc_huffman_lens[4][4][18] = {
{
{ 16, 15, 13, 11, 8, 5, 3, 1, 2, 4, 6, 9, 10, 12, 14, 16, 7, 0 },
{ 10, 8, 7, 6, 4, 4, 3, 2, 2, 3, 4, 6, 7, 9, 11, 11, 7, 0 },
{ 15, 15, 14, 11, 8, 6, 4, 2, 1, 4, 5, 7, 9, 10, 12, 13, 4, 0 },
{ 13, 11, 10, 8, 6, 4, 2, 2, 2, 3, 5, 7, 9, 12, 15, 15, 14, 0 },
},
{
{ 14, 12, 10, 8, 7, 4, 2, 2, 2, 3, 5, 7, 9, 11, 13, 14, 7, 0 },
{ 14, 13, 11, 8, 6, 4, 3, 2, 2, 3, 5, 7, 9, 10, 12, 14, 3, 0 },
{ 13, 12, 10, 7, 5, 4, 3, 2, 2, 3, 4, 6, 8, 9, 11, 13, 4, 0 },
{ 13, 12, 10, 7, 5, 4, 3, 2, 2, 3, 4, 6, 8, 9, 11, 13, 4, 0 },
},
{
{ 16, 14, 12, 10, 8, 5, 3, 1, 2, 4, 7, 9, 11, 13, 15, 17, 6, 17 },
{ 15, 13, 11, 8, 6, 4, 2, 2, 2, 3, 5, 7, 10, 12, 14, 16, 9, 16 },
{ 14, 12, 11, 9, 8, 6, 3, 1, 2, 5, 7, 10, 13, 15, 16, 17, 4, 17 },
{ 16, 14, 12, 9, 7, 5, 2, 2, 2, 3, 4, 6, 8, 11, 13, 15, 10, 16 },
},
{
{ 13, 11, 10, 8, 7, 5, 2, 2, 2, 4, 6, 9, 12, 14, 15, 16, 3, 16 },
{ 11, 11, 10, 9, 8, 7, 5, 4, 3, 3, 3, 3, 3, 3, 4, 5, 6, 5 },
{ 9, 9, 7, 6, 5, 4, 3, 3, 2, 3, 4, 5, 4, 5, 5, 6, 8, 6 },
{ 13, 12, 10, 8, 5, 3, 3, 2, 2, 3, 4, 7, 9, 11, 14, 15, 6, 15 },
}
};

static const uint16_t imc_huffman_bits[4][4][18] = {
{
{ 0xCC32, 0x6618, 0x1987, 0x0660, 0x00CD, 0x0018, 0x0007, 0x0000, 0x0002, 0x000D, 0x0032, 0x0199, 0x0331, 0x0CC2, 0x330D, 0xCC33, 0x0067, 0x0000 },
{ 0x02FE, 0x00BE, 0x005E, 0x002D, 0x000A, 0x0009, 0x0003, 0x0003, 0x0000, 0x0002, 0x0008, 0x002C, 0x005D, 0x017E, 0x05FE, 0x05FF, 0x005C, 0x0000 },
{ 0x5169, 0x5168, 0x28B5, 0x0517, 0x00A3, 0x0029, 0x0008, 0x0003, 0x0000, 0x0009, 0x0015, 0x0050, 0x0144, 0x028A, 0x0A2C, 0x145B, 0x000B, 0x0000 },
{ 0x1231, 0x048D, 0x0247, 0x0090, 0x0025, 0x0008, 0x0001, 0x0003, 0x0000, 0x0005, 0x0013, 0x0049, 0x0122, 0x0919, 0x48C3, 0x48C2, 0x2460, 0x0000 },
},
{
{ 0x2D1D, 0x0B46, 0x02D0, 0x00B5, 0x0059, 0x000A, 0x0003, 0x0001, 0x0000, 0x0004, 0x0017, 0x005B, 0x0169, 0x05A2, 0x168F, 0x2D1C, 0x0058, 0x0000 },
{ 0x1800, 0x0C01, 0x0301, 0x0061, 0x0019, 0x0007, 0x0004, 0x0003, 0x0000, 0x0005, 0x000D, 0x0031, 0x00C1, 0x0181, 0x0601, 0x1801, 0x0002, 0x0000 },
{ 0x1556, 0x0AAA, 0x02AB, 0x0054, 0x0014, 0x000B, 0x0002, 0x0003, 0x0000, 0x0003, 0x0008, 0x002B, 0x00AB, 0x0154, 0x0554, 0x1557, 0x0009, 0x0000 },
{ 0x1556, 0x0AAA, 0x02AB, 0x0054, 0x0014, 0x000B, 0x0002, 0x0003, 0x0000, 0x0003, 0x0008, 0x002B, 0x00AB, 0x0154, 0x0554, 0x1557, 0x0009, 0x0000 },
},
{
{ 0x2993, 0x0A65, 0x0298, 0x00A7, 0x0028, 0x0004, 0x0000, 0x0001, 0x0001, 0x0003, 0x0015, 0x0052, 0x014D, 0x0533, 0x14C8, 0x5324, 0x000B, 0x5325 },
{ 0x09B8, 0x026F, 0x009A, 0x0012, 0x0005, 0x0000, 0x0001, 0x0002, 0x0003, 0x0001, 0x0003, 0x0008, 0x004C, 0x0136, 0x04DD, 0x1373, 0x0027, 0x1372 },
{ 0x0787, 0x01E0, 0x00F1, 0x003D, 0x001F, 0x0006, 0x0001, 0x0001, 0x0001, 0x0002, 0x000E, 0x0079, 0x03C2, 0x0F0D, 0x1E19, 0x3C30, 0x0000, 0x3C31 },
{ 0x4B06, 0x12C0, 0x04B1, 0x0097, 0x0024, 0x0008, 0x0002, 0x0003, 0x0000, 0x0003, 0x0005, 0x0013, 0x004A, 0x0259, 0x0961, 0x2582, 0x012D, 0x4B07 },
},
{
{ 0x0A5A, 0x0297, 0x014A, 0x0053, 0x0028, 0x000B, 0x0003, 0x0000, 0x0002, 0x0004, 0x0015, 0x00A4, 0x052C, 0x14B7, 0x296C, 0x52DB, 0x0003, 0x52DA },
{ 0x0193, 0x0192, 0x00C8, 0x0065, 0x0033, 0x0018, 0x0007, 0x0004, 0x0000, 0x0004, 0x0005, 0x0007, 0x0006, 0x0003, 0x0005, 0x0005, 0x000D, 0x0004 },
{ 0x0012, 0x0013, 0x0005, 0x0003, 0x0000, 0x0003, 0x0005, 0x0004, 0x0003, 0x0003, 0x0005, 0x0005, 0x0004, 0x0004, 0x0003, 0x0005, 0x0008, 0x0004 },
{ 0x0D66, 0x06B2, 0x01AD, 0x006A, 0x000C, 0x0005, 0x0004, 0x0000, 0x0003, 0x0002, 0x0007, 0x0034, 0x00D7, 0x0358, 0x1ACF, 0x359C, 0x001B, 0x359D },
}
};


+ 1
- 0
libavformat/riff.c View File

@@ -194,6 +194,7 @@ const CodecTag codec_wav_tags[] = {
{ CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
{ CODEC_ID_TRUESPEECH, 0x22 },
{ CODEC_ID_FLAC, 0xF1AC },
{ CODEC_ID_IMC, 0x401 },

/* FIXME: All of the IDs below are not 16 bit and thus illegal. */
{ CODEC_ID_TTA, MKTAG('T', 'T', 'A', '1') },


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