ref: fc7d19eab505a83c9c03f1e5ac75e7d3e4694961
dir: /src/opus_decoder.c/
/* Copyright (c) 2010 Xiph.Org Foundation, Skype Limited
Written by Jean-Marc Valin and Koen Vos */
/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include "opus_decoder.h"
#include "entdec.h"
#include "modes.h"
#include "SKP_Silk_SDK_API.h"
OpusDecoder *opus_decoder_create(int Fs, int channels)
{
char *raw_state;
int ret, silkDecSizeBytes, celtDecSizeBytes;
OpusDecoder *st;
/* Initialize SILK encoder */
ret = SKP_Silk_SDK_Get_Decoder_Size( &silkDecSizeBytes );
if( ret ) {
/* Handle error */
}
celtDecSizeBytes = celt_decoder_get_size(channels);
raw_state = calloc(sizeof(OpusDecoder)+silkDecSizeBytes+celtDecSizeBytes, 1);
st = (OpusDecoder*)raw_state;
st->silk_dec = (void*)(raw_state+sizeof(OpusDecoder));
st->celt_dec = (CELTDecoder*)(raw_state+sizeof(OpusDecoder)+silkDecSizeBytes);
st->stream_channels = st->channels = channels;
st->Fs = Fs;
/* Reset decoder */
ret = SKP_Silk_SDK_InitDecoder( st->silk_dec );
if( ret ) {
/* Handle error */
}
/* Initialize CELT decoder */
st->celt_dec = celt_decoder_init(st->celt_dec, Fs, channels, NULL);
st->prev_mode = 0;
return st;
}
int opus_decode(OpusDecoder *st, const unsigned char *data,
int len, short *pcm, int frame_size, int decode_fec)
{
int i, silk_ret=0, celt_ret=0;
ec_dec dec;
SKP_SILK_SDK_DecControlStruct DecControl;
SKP_int32 silk_frame_size;
short pcm_celt[960*2];
short pcm_transition[960*2];
int audiosize;
int mode;
int transition=0;
int start_band;
int redundancy=0;
/* Payloads of 1 (2 including ToC) or 0 trigger the PLC/DTX */
if (len<=2)
data = NULL;
if (data != NULL)
{
/* Decoding mode/bandwidth/framesize from first byte */
if (data[0]&0x80)
{
mode = MODE_CELT_ONLY;
st->bandwidth = BANDWIDTH_MEDIUMBAND + ((data[0]>>5)&0x3);
if (st->bandwidth == BANDWIDTH_MEDIUMBAND)
st->bandwidth = BANDWIDTH_NARROWBAND;
audiosize = ((data[0]>>3)&0x3);
audiosize = (st->Fs<<audiosize)/400;
} else if ((data[0]&0x60) == 0x60)
{
mode = MODE_HYBRID;
st->bandwidth = (data[0]&0x10) ? BANDWIDTH_FULLBAND : BANDWIDTH_SUPERWIDEBAND;
audiosize = (data[0]&0x08) ? st->Fs/50 : st->Fs/100;
} else {
mode = MODE_SILK_ONLY;
st->bandwidth = BANDWIDTH_NARROWBAND + ((data[0]>>5)&0x3);
audiosize = ((data[0]>>3)&0x3);
if (audiosize == 3)
audiosize = st->Fs*60/1000;
else
audiosize = (st->Fs<<audiosize)/100;
}
st->stream_channels = (data[0]&0x4) ? 2 : 1;
/*printf ("%d %d %d\n", st->mode, st->bandwidth, audiosize);*/
len -= 1;
data += 1;
ec_dec_init(&dec,(unsigned char*)data,len);
} else {
audiosize = frame_size;
mode = st->prev_mode;
}
if (mode != st->prev_mode && st->prev_mode > 0
&& !(mode == MODE_SILK_ONLY && st->prev_mode == MODE_HYBRID)
&& !(mode == MODE_HYBRID && st->prev_mode == MODE_SILK_ONLY))
{
transition = 1;
if (mode == MODE_CELT_ONLY && !st->prev_redundancy)
opus_decode(st, NULL, 0, pcm_transition, IMAX(480, audiosize), 0);
}
if (audiosize > frame_size)
{
fprintf(stderr, "PCM buffer too small");
return -1;
} else {
frame_size = audiosize;
}
/* SILK processing */
if (mode != MODE_CELT_ONLY)
{
int lost_flag, decoded_samples;
SKP_int16 *pcm_ptr = pcm;
if (st->prev_mode==MODE_CELT_ONLY)
SKP_Silk_SDK_InitDecoder( st->silk_dec );
DecControl.API_sampleRate = st->Fs;
DecControl.payloadSize_ms = 1000 * audiosize / st->Fs;
if( mode == MODE_SILK_ONLY ) {
if( st->bandwidth == BANDWIDTH_NARROWBAND ) {
DecControl.internalSampleRate = 8000;
} else if( st->bandwidth == BANDWIDTH_MEDIUMBAND ) {
DecControl.internalSampleRate = 12000;
} else if( st->bandwidth == BANDWIDTH_WIDEBAND ) {
DecControl.internalSampleRate = 16000;
} else {
SKP_assert( 0 );
}
} else {
/* Hybrid mode */
DecControl.internalSampleRate = 16000;
}
lost_flag = data == NULL ? 1 : 2 * decode_fec;
decoded_samples = 0;
do {
/* Call SILK decoder */
int first_frame = decoded_samples == 0;
silk_ret = SKP_Silk_SDK_Decode( st->silk_dec, &DecControl,
lost_flag, first_frame, &dec, len, pcm_ptr, &silk_frame_size );
if( silk_ret ) {
fprintf (stderr, "SILK decode error\n");
/* Handle error */
}
pcm_ptr += silk_frame_size;
decoded_samples += silk_frame_size;
} while( decoded_samples < frame_size );
} else {
for (i=0;i<frame_size*st->channels;i++)
pcm[i] = 0;
}
start_band = 0;
if (mode == MODE_HYBRID && data != NULL)
{
/* Check if we have a redundant 0-8 kHz band */
redundancy = ec_dec_bit_logp(&dec, 12);
if (!redundancy)
start_band = 17;
}
if (redundancy)
transition = 0;
if (transition && mode != MODE_CELT_ONLY)
opus_decode(st, NULL, 0, pcm_transition, IMAX(480, audiosize), 0);
/* MUST be after PLC */
celt_decoder_ctl(st->celt_dec, CELT_SET_START_BAND(start_band));
if (mode != MODE_SILK_ONLY)
{
int endband;
switch(st->bandwidth)
{
case BANDWIDTH_NARROWBAND:
endband = 13;
break;
case BANDWIDTH_WIDEBAND:
endband = 17;
break;
case BANDWIDTH_SUPERWIDEBAND:
endband = 19;
break;
case BANDWIDTH_FULLBAND:
endband = 21;
break;
}
celt_decoder_ctl(st->celt_dec, CELT_SET_END_BAND(endband));
celt_decoder_ctl(st->celt_dec, CELT_SET_CHANNELS(st->stream_channels));
if (st->prev_mode == MODE_SILK_ONLY)
celt_decoder_ctl(st->celt_dec, CELT_RESET_STATE);
/* Decode CELT */
celt_ret = celt_decode_with_ec(st->celt_dec, decode_fec?NULL:data, len, pcm_celt, frame_size, &dec);
for (i=0;i<frame_size*st->channels;i++)
pcm[i] = ADD_SAT16(pcm[i], pcm_celt[i]);
}
if (transition)
{
int plc_length, overlap;
if (mode == MODE_CELT_ONLY)
plc_length = IMIN(audiosize, 10+st->Fs/200);
else
plc_length = IMIN(audiosize, 10+st->Fs/400);
for (i=0;i<plc_length;i++)
pcm[i] = pcm_transition[i];
overlap = IMIN(480, IMAX(0, audiosize-plc_length));
for (i=0;i<overlap;i++)
pcm[plc_length+i] = (i*pcm[plc_length+i] + (overlap-i)*pcm_transition[plc_length+i])/overlap;
}
#if OPUS_TEST_RANGE_CODER_STATE
st->rangeFinal = dec.rng;
#endif
st->prev_mode = mode;
st->prev_redundancy = redundancy;
return celt_ret<0 ? celt_ret : audiosize;
}
void opus_decoder_ctl(OpusDecoder *st, int request, ...)
{
va_list ap;
va_start(ap, request);
switch (request)
{
case OPUS_GET_MODE_REQUEST:
{
int *value = va_arg(ap, int*);
*value = st->prev_mode;
}
break;
case OPUS_SET_BANDWIDTH_REQUEST:
{
int value = va_arg(ap, int);
st->bandwidth = value;
}
break;
case OPUS_GET_BANDWIDTH_REQUEST:
{
int *value = va_arg(ap, int*);
*value = st->bandwidth;
}
break;
default:
fprintf(stderr, "unknown opus_decoder_ctl() request: %d", request);
break;
}
va_end(ap);
}
void opus_decoder_destroy(OpusDecoder *st)
{
free(st);
}
#if OPUS_TEST_RANGE_CODER_STATE
int opus_decoder_get_final_range(OpusDecoder *st)
{
return st->rangeFinal;
}
#endif