libavcodec/truespeech.c - vendor/opensource/ffmpeg - Git at Google

 /*
  * 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,
                 const uint8_t *buf, int buf_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",
     CODEC_TYPE_AUDIO,
     CODEC_ID_TRUESPEECH,
     sizeof(TSContext),
     truespeech_decode_init,
     NULL,
     NULL,
     truespeech_decode_frame,
     .long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
 };
	/*
	* 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,
	const uint8_t *buf, int buf_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",
	CODEC_TYPE_AUDIO,
	CODEC_ID_TRUESPEECH,
	sizeof(TSContext),
	truespeech_decode_init,
	NULL,
	NULL,
	truespeech_decode_frame,
	.long_name = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
	};