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FFmpeg/libavcodec/truespeech.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which 
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

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/*
* DSP Group TrueSpeech compatible decoder
* Copyright (c) 2005 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
*/
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "truespeech_data.h"
/**
* @file libavcodec/truespeech.c
* TrueSpeech decoder.
*/
/**
* TrueSpeech decoder context
*/
typedef struct {
/* input data */
int16_t vector[8]; //< input vector: 5/5/4/4/4/3/3/3
int offset1[2]; //< 8-bit value, used in one copying offset
int offset2[4]; //< 7-bit value, encodes offsets for copying and for two-point filter
int pulseoff[4]; //< 4-bit offset of pulse values block
int pulsepos[4]; //< 27-bit variable, encodes 7 pulse positions
int pulseval[4]; //< 7x2-bit pulse values
int flag; //< 1-bit flag, shows how to choose filters
/* temporary data */
int filtbuf[146]; // some big vector used for storing filters
int prevfilt[8]; // filter from previous frame
int16_t tmp1[8]; // coefficients for adding to out
int16_t tmp2[8]; // coefficients for adding to out
int16_t tmp3[8]; // coefficients for adding to out
int16_t cvector[8]; // correlated input vector
int filtval; // gain value for one function
int16_t newvec[60]; // tmp vector
int16_t filters[32]; // filters for every subframe
} TSContext;
static av_cold int truespeech_decode_init(AVCodecContext * avctx)
{
// TSContext *c = avctx->priv_data;
avctx->sample_fmt = SAMPLE_FMT_S16;
return 0;
}
static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
{
uint32_t t;
/* first dword */
t = AV_RL32(input);
input += 4;
dec->flag = t & 1;
dec->vector[0] = ts_codebook[0][(t >> 1) & 0x1F];
dec->vector[1] = ts_codebook[1][(t >> 6) & 0x1F];
dec->vector[2] = ts_codebook[2][(t >> 11) & 0xF];
dec->vector[3] = ts_codebook[3][(t >> 15) & 0xF];
dec->vector[4] = ts_codebook[4][(t >> 19) & 0xF];
dec->vector[5] = ts_codebook[5][(t >> 23) & 0x7];
dec->vector[6] = ts_codebook[6][(t >> 26) & 0x7];
dec->vector[7] = ts_codebook[7][(t >> 29) & 0x7];
/* second dword */
t = AV_RL32(input);
input += 4;
dec->offset2[0] = (t >> 0) & 0x7F;
dec->offset2[1] = (t >> 7) & 0x7F;
dec->offset2[2] = (t >> 14) & 0x7F;
dec->offset2[3] = (t >> 21) & 0x7F;
dec->offset1[0] = ((t >> 28) & 0xF) << 4;
/* third dword */
t = AV_RL32(input);
input += 4;
dec->pulseval[0] = (t >> 0) & 0x3FFF;
dec->pulseval[1] = (t >> 14) & 0x3FFF;
dec->offset1[1] = (t >> 28) & 0x0F;
/* fourth dword */
t = AV_RL32(input);
input += 4;
dec->pulseval[2] = (t >> 0) & 0x3FFF;
dec->pulseval[3] = (t >> 14) & 0x3FFF;
dec->offset1[1] |= ((t >> 28) & 0x0F) << 4;
/* fifth dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[0] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[0] = (t >> 0) & 0xF;
dec->offset1[0] |= (t >> 31) & 1;
/* sixth dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[1] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[1] = (t >> 0) & 0xF;
dec->offset1[0] |= ((t >> 31) & 1) << 1;
/* seventh dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[2] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[2] = (t >> 0) & 0xF;
dec->offset1[0] |= ((t >> 31) & 1) << 2;
/* eighth dword */
t = AV_RL32(input);
input += 4;
dec->pulsepos[3] = (t >> 4) & 0x7FFFFFF;
dec->pulseoff[3] = (t >> 0) & 0xF;
dec->offset1[0] |= ((t >> 31) & 1) << 3;
}
static void truespeech_correlate_filter(TSContext *dec)
{
int16_t tmp[8];
int i, j;
for(i = 0; i < 8; i++){
if(i > 0){
memcpy(tmp, dec->cvector, i * 2);
for(j = 0; j < i; j++)
dec->cvector[j] = ((tmp[i - j - 1] * dec->vector[i]) +
(dec->cvector[j] << 15) + 0x4000) >> 15;
}
dec->cvector[i] = (8 - dec->vector[i]) >> 3;
}
for(i = 0; i < 8; i++)
dec->cvector[i] = (dec->cvector[i] * ts_230[i]) >> 15;
dec->filtval = dec->vector[0];
}
static void truespeech_filters_merge(TSContext *dec)
{
int i;
if(!dec->flag){
for(i = 0; i < 8; i++){
dec->filters[i + 0] = dec->prevfilt[i];
dec->filters[i + 8] = dec->prevfilt[i];
}
}else{
for(i = 0; i < 8; i++){
dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
}
}
for(i = 0; i < 8; i++){
dec->filters[i + 16] = dec->cvector[i];
dec->filters[i + 24] = dec->cvector[i];
}
}
static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
{
int16_t tmp[146 + 60], *ptr0, *ptr1;
const int16_t *filter;
int i, t, off;
t = dec->offset2[quart];
if(t == 127){
memset(dec->newvec, 0, 60 * 2);
return;
}
for(i = 0; i < 146; i++)
tmp[i] = dec->filtbuf[i];
off = (t / 25) + dec->offset1[quart >> 1] + 18;
ptr0 = tmp + 145 - off;
ptr1 = tmp + 146;
filter = (const int16_t*)ts_240 + (t % 25) * 2;
for(i = 0; i < 60; i++){
t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
ptr0++;
dec->newvec[i] = t;
ptr1[i] = t;
}
}
static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
{
int16_t tmp[7];
int i, j, t;
const int16_t *ptr1;
int16_t *ptr2;
int coef;
memset(out, 0, 60 * 2);
for(i = 0; i < 7; i++) {
t = dec->pulseval[quart] & 3;
dec->pulseval[quart] >>= 2;
tmp[6 - i] = ts_562[dec->pulseoff[quart] * 4 + t];
}
coef = dec->pulsepos[quart] >> 15;
ptr1 = (const int16_t*)ts_140 + 30;
ptr2 = tmp;
for(i = 0, j = 3; (i < 30) && (j > 0); i++){
t = *ptr1++;
if(coef >= t)
coef -= t;
else{
out[i] = *ptr2++;
ptr1 += 30;
j--;
}
}
coef = dec->pulsepos[quart] & 0x7FFF;
ptr1 = (const int16_t*)ts_140;
for(i = 30, j = 4; (i < 60) && (j > 0); i++){
t = *ptr1++;
if(coef >= t)
coef -= t;
else{
out[i] = *ptr2++;
ptr1 += 30;
j--;
}
}
}
static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
{
int i;
for(i = 0; i < 86; i++)
dec->filtbuf[i] = dec->filtbuf[i + 60];
for(i = 0; i < 60; i++){
dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
out[i] += dec->newvec[i];
}
}
static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
{
int i,k;
int t[8];
int16_t *ptr0, *ptr1;
ptr0 = dec->tmp1;
ptr1 = dec->filters + quart * 8;
for(i = 0; i < 60; i++){
int sum = 0;
for(k = 0; k < 8; k++)
sum += ptr0[k] * ptr1[k];
sum = (sum + (out[i] << 12) + 0x800) >> 12;
out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
for(k = 7; k > 0; k--)
ptr0[k] = ptr0[k - 1];
ptr0[0] = out[i];
}
for(i = 0; i < 8; i++)
t[i] = (ts_5E2[i] * ptr1[i]) >> 15;
ptr0 = dec->tmp2;
for(i = 0; i < 60; i++){
int sum = 0;
for(k = 0; k < 8; k++)
sum += ptr0[k] * t[k];
for(k = 7; k > 0; k--)
ptr0[k] = ptr0[k - 1];
ptr0[0] = out[i];
out[i] = ((out[i] << 12) - sum) >> 12;
}
for(i = 0; i < 8; i++)
t[i] = (ts_5F2[i] * ptr1[i]) >> 15;
ptr0 = dec->tmp3;
for(i = 0; i < 60; i++){
int sum = out[i] << 12;
for(k = 0; k < 8; k++)
sum += ptr0[k] * t[k];
for(k = 7; k > 0; k--)
ptr0[k] = ptr0[k - 1];
ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
sum = sum - (sum >> 3);
out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
}
}
static void truespeech_save_prevvec(TSContext *c)
{
int i;
for(i = 0; i < 8; i++)
c->prevfilt[i] = c->cvector[i];
}
static int truespeech_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
TSContext *c = avctx->priv_data;
int i, j;
short *samples = data;
int consumed = 0;
int16_t out_buf[240];
int iterations;
if (!buf_size)
return 0;
iterations = FFMIN(buf_size / 32, *data_size / 480);
for(j = 0; j < iterations; j++) {
truespeech_read_frame(c, buf + consumed);
consumed += 32;
truespeech_correlate_filter(c);
truespeech_filters_merge(c);
memset(out_buf, 0, 240 * 2);
for(i = 0; i < 4; i++) {
truespeech_apply_twopoint_filter(c, i);
truespeech_place_pulses(c, out_buf + i * 60, i);
truespeech_update_filters(c, out_buf + i * 60, i);
truespeech_synth(c, out_buf + i * 60, i);
}
truespeech_save_prevvec(c);
/* finally output decoded frame */
for(i = 0; i < 240; i++)
*samples++ = out_buf[i];
}
*data_size = consumed * 15;
return consumed;
}
AVCodec truespeech_decoder = {
"truespeech",
AVMEDIA_TYPE_AUDIO,
CODEC_ID_TRUESPEECH,
sizeof(TSContext),
truespeech_decode_init,
NULL,
NULL,
truespeech_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
};
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