ref: dd5f3e39767bd89e03615d344d8c24669c36341e
dir: /src/opus_encoder.c/
/* Copyright (c) 2010-2011 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 <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include "celt.h"
#include "entenc.h"
#include "modes.h"
#include "silk_API.h"
#include "stack_alloc.h"
#include "float_cast.h"
#include "opus.h"
#include "arch.h"
#include "opus_private.h"
#ifdef FIXED_POINT
#define celt_encode_native celt_encode
#else
#define celt_encode_native celt_encode_float
#endif
#define MAX_ENCODER_BUFFER 480
struct OpusEncoder {
int celt_enc_offset;
int silk_enc_offset;
silk_EncControlStruct silk_mode;
int hybrid_stereo_width_Q14;
int channels;
int stream_channels;
int force_mono;
int mode;
int application;
int prev_mode;
int signal_type;
int bandwidth;
int user_bandwidth;
int voice_ratio;
/* Sampling rate (at the API level) */
int Fs;
int use_vbr;
int vbr_constraint;
int bitrate_bps;
int user_bitrate_bps;
int encoder_buffer;
int delay_compensation;
int first;
opus_val16 delay_buffer[MAX_ENCODER_BUFFER*2];
int rangeFinal;
};
/* Transition tables for the voice and audio modes. First column is the
middle (memoriless) threshold. The second column is the hysteresis
(difference with the middle) */
static const int voice_bandwidth_thresholds[10] = {
11000, 1000, /* NB<->MB */
14000, 1000, /* MB<->WB */
21000, 2000, /* WB<->SWB */
29000, 2000, /* SWB<->FB */
};
static const int audio_bandwidth_thresholds[10] = {
30000, 0, /* MB not allowed */
20000, 2000, /* MB<->WB */
26000, 2000, /* WB<->SWB */
33000, 2000, /* SWB<->FB */
};
int opus_encoder_get_size(int channels)
{
int silkEncSizeBytes, celtEncSizeBytes;
int ret;
ret = silk_Get_Encoder_Size( &silkEncSizeBytes );
if (ret)
return 0;
silkEncSizeBytes = align(silkEncSizeBytes);
celtEncSizeBytes = celt_encoder_get_size(channels);
return align(sizeof(OpusEncoder))+silkEncSizeBytes+celtEncSizeBytes;
}
OpusEncoder *opus_encoder_init(OpusEncoder* st, int Fs, int channels, int application)
{
void *silk_enc;
CELTEncoder *celt_enc;
int err;
int ret, silkEncSizeBytes;
if (channels > 2 || channels < 1)
return NULL;
if (application < OPUS_APPLICATION_VOIP || application > OPUS_APPLICATION_AUDIO)
return NULL;
if (Fs != 8000 && Fs != 12000 && Fs != 16000 && Fs != 24000 && Fs != 48000)
return NULL;
memset(st, 0, opus_encoder_get_size(channels));
/* Create SILK encoder */
ret = silk_Get_Encoder_Size( &silkEncSizeBytes );
if (ret)
return NULL;
silkEncSizeBytes = align(silkEncSizeBytes);
st->silk_enc_offset = align(sizeof(OpusEncoder));
st->celt_enc_offset = st->silk_enc_offset+silkEncSizeBytes;
silk_enc = (char*)st+st->silk_enc_offset;
celt_enc = (CELTEncoder*)((char*)st+st->celt_enc_offset);
st->stream_channels = st->channels = channels;
st->Fs = Fs;
ret = silk_InitEncoder( silk_enc, &st->silk_mode );
if (ret)
goto failure;
/* default SILK parameters */
st->silk_mode.nChannelsAPI = channels;
st->silk_mode.nChannelsInternal = channels;
st->silk_mode.API_sampleRate = st->Fs;
st->silk_mode.maxInternalSampleRate = 16000;
st->silk_mode.minInternalSampleRate = 8000;
st->silk_mode.desiredInternalSampleRate = 16000;
st->silk_mode.payloadSize_ms = 20;
st->silk_mode.bitRate = 25000;
st->silk_mode.packetLossPercentage = 0;
st->silk_mode.complexity = 10;
st->silk_mode.useInBandFEC = 0;
st->silk_mode.useDTX = 0;
st->silk_mode.useCBR = 0;
st->silk_mode.HP_cutoff_Hz = 0;
st->hybrid_stereo_width_Q14 = 1 << 14;
/* Create CELT encoder */
/* Initialize CELT encoder */
celt_encoder_init(celt_enc, Fs, channels, &err);
if (err != CELT_OK)
goto failure;
celt_encoder_ctl(celt_enc, CELT_SET_SIGNALLING(0));
st->mode = MODE_HYBRID;
st->bandwidth = OPUS_BANDWIDTH_FULLBAND;
st->use_vbr = 0;
st->user_bitrate_bps = OPUS_BITRATE_AUTO;
st->bitrate_bps = 3000+Fs*channels;
st->application = application;
st->signal_type = OPUS_SIGNAL_AUTO;
st->user_bandwidth = OPUS_BANDWIDTH_AUTO;
st->voice_ratio = 90;
st->first = 1;
st->encoder_buffer = st->Fs/100;
st->delay_compensation = st->Fs/400;
if (st->Fs > 16000)
st->delay_compensation += 10;
return st;
failure:
free(st);
return NULL;
}
static unsigned char gen_toc(int mode, int framerate, int bandwidth, int channels)
{
int period;
unsigned char toc;
period = 0;
while (framerate < 400)
{
framerate <<= 1;
period++;
}
if (mode == MODE_SILK_ONLY)
{
toc = (bandwidth-OPUS_BANDWIDTH_NARROWBAND)<<5;
toc |= (period-2)<<3;
} else if (mode == MODE_CELT_ONLY)
{
int tmp = bandwidth-OPUS_BANDWIDTH_MEDIUMBAND;
if (tmp < 0)
tmp = 0;
toc = 0x80;
toc |= tmp << 5;
toc |= period<<3;
} else /* Hybrid */
{
toc = 0x60;
toc |= (bandwidth-OPUS_BANDWIDTH_SUPERWIDEBAND)<<4;
toc |= (period-2)<<3;
}
toc |= (channels==2)<<2;
return toc;
}
OpusEncoder *opus_encoder_create(int Fs, int channels, int mode)
{
char *raw_state = (char *)malloc(opus_encoder_get_size(channels));
if (raw_state == NULL)
return NULL;
return opus_encoder_init((OpusEncoder*)raw_state, Fs, channels, mode);
}
#ifdef FIXED_POINT
int opus_encode(OpusEncoder *st, const opus_val16 *pcm, int frame_size,
unsigned char *data, int max_data_bytes)
#else
int opus_encode_float(OpusEncoder *st, const opus_val16 *pcm, int frame_size,
unsigned char *data, int max_data_bytes)
#endif
{
void *silk_enc;
CELTEncoder *celt_enc;
int i;
int ret=0;
int nBytes;
ec_enc enc;
int silk_internal_bandwidth=-1;
int bytes_target;
int prefill=0;
int start_band = 0;
int redundancy = 0;
int redundancy_bytes = 0;
int celt_to_silk = 0;
VARDECL(opus_val16, pcm_buf);
int nb_compr_bytes;
int to_celt = 0;
opus_int32 mono_rate;
opus_uint32 redundant_rng = 0;
ALLOC_STACK;
st->rangeFinal = 0;
if (400*frame_size != st->Fs && 200*frame_size != st->Fs && 100*frame_size != st->Fs &&
50*frame_size != st->Fs && 25*frame_size != st->Fs && 50*frame_size != 3*st->Fs)
return OPUS_BAD_ARG;
silk_enc = (char*)st+st->silk_enc_offset;
celt_enc = (CELTEncoder*)((char*)st+st->celt_enc_offset);
if (st->user_bitrate_bps==OPUS_BITRATE_AUTO)
st->bitrate_bps = 60*st->Fs/frame_size + st->Fs*st->channels;
else
st->bitrate_bps = st->user_bitrate_bps;
/* Rate-dependent mono-stereo decision */
if (st->force_mono)
{
st->stream_channels = 1;
} else if (st->mode == MODE_CELT_ONLY && st->channels == 2)
{
opus_int32 decision_rate;
decision_rate = st->bitrate_bps + st->voice_ratio*st->voice_ratio;
/* Add some hysteresis */
if (st->stream_channels == 2)
decision_rate += 4000;
else
decision_rate -= 4000;
if (decision_rate>48000)
st->stream_channels = 2;
else
st->stream_channels = 1;
} else {
st->stream_channels = st->channels;
}
#ifdef FUZZING
if (st->channels == 2 && (rand()&0x1F)==0)
st->stream_channels = 3-st->stream_channels;
#endif
/* Equivalent bit-rate for mono */
mono_rate = st->bitrate_bps;
if (st->stream_channels==2)
mono_rate = 2*mono_rate/3;
/* Compensate for smaller frame sizes assuming an equivalent overhead
of 60 bits/frame */
mono_rate -= 60*(st->Fs/frame_size - 50);
#ifdef FUZZING
if ((rand()&0xF)==0)
{
if ((rand()&0x1)==0)
st->mode = MODE_CELT_ONLY;
else
st->mode = MODE_SILK_ONLY;
} else {
if (st->prev_mode==MODE_CELT_ONLY)
st->mode = MODE_CELT_ONLY;
else
st->mode = MODE_SILK_ONLY;
}
#else
/* Mode selection depending on application and signal type */
if (st->application==OPUS_APPLICATION_VOIP)
{
opus_int32 threshold = 20000;
/* Hysteresis */
if (st->prev_mode == MODE_CELT_ONLY)
threshold -= 4000;
else if (st->prev_mode>0)
threshold += 4000;
/* OPUS_APPLICATION_VOIP defaults to MODE_SILK_ONLY */
if (st->signal_type == OPUS_SIGNAL_MUSIC && mono_rate > threshold)
st->mode = MODE_CELT_ONLY;
else
st->mode = MODE_SILK_ONLY;
} else {/* OPUS_APPLICATION_AUDIO */
opus_int32 threshold;
/* SILK/CELT threshold is higher for voice than for music */
threshold = 36000;
if (st->signal_type == OPUS_SIGNAL_MUSIC)
threshold -= 20000;
else if (st->signal_type == OPUS_SIGNAL_VOICE)
threshold += 8000;
/* Hysteresis */
if (st->prev_mode == MODE_CELT_ONLY)
threshold -= 4000;
else if (st->prev_mode>0)
threshold += 4000;
if (mono_rate>threshold)
st->mode = MODE_CELT_ONLY;
else
st->mode = MODE_SILK_ONLY;
}
#endif
/* Override the chosen mode to make sure we meet the requested frame size */
if (st->mode == MODE_CELT_ONLY && frame_size > st->Fs/50)
st->mode = MODE_SILK_ONLY;
if (st->mode != MODE_CELT_ONLY && frame_size < st->Fs/100)
st->mode = MODE_CELT_ONLY;
if (st->prev_mode > 0 &&
((st->mode != MODE_CELT_ONLY && st->prev_mode == MODE_CELT_ONLY) ||
(st->mode == MODE_CELT_ONLY && st->prev_mode != MODE_CELT_ONLY)))
{
redundancy = 1;
celt_to_silk = (st->mode != MODE_CELT_ONLY);
if (!celt_to_silk)
{
/* Switch to SILK/hybrid if frame size is 10 ms or more*/
if (frame_size >= st->Fs/100)
{
st->mode = st->prev_mode;
to_celt = 1;
} else {
redundancy=0;
}
}
}
if (st->mode != MODE_CELT_ONLY && st->prev_mode == MODE_CELT_ONLY)
{
silk_EncControlStruct dummy;
silk_InitEncoder( silk_enc, &dummy);
prefill=1;
}
/* Automatic (rate-dependent) bandwidth selection */
if (st->mode == MODE_CELT_ONLY || st->first || st->silk_mode.allowBandwidthSwitch)
{
const int *bandwidth_thresholds;
int bandwidth = OPUS_BANDWIDTH_FULLBAND;
bandwidth_thresholds = st->mode == MODE_CELT_ONLY ? audio_bandwidth_thresholds : voice_bandwidth_thresholds;
do {
int threshold, hysteresis;
threshold = bandwidth_thresholds[2*(bandwidth-OPUS_BANDWIDTH_MEDIUMBAND)];
hysteresis = bandwidth_thresholds[2*(bandwidth-OPUS_BANDWIDTH_MEDIUMBAND)+1];
if (!st->first)
{
if (st->bandwidth >= bandwidth)
threshold -= hysteresis;
else
threshold += hysteresis;
}
if (mono_rate >= threshold)
break;
} while (--bandwidth>OPUS_BANDWIDTH_NARROWBAND);
st->bandwidth = bandwidth;
/* Prevents any transition to SWB/FB until the SILK layer has fully
switched to WB mode and turned the variable LP filter off */
if (st->mode != MODE_CELT_ONLY && !st->silk_mode.inWBmodeWithoutVariableLP && st->bandwidth > OPUS_BANDWIDTH_WIDEBAND)
st->bandwidth = OPUS_BANDWIDTH_WIDEBAND;
}
/* Prevents Opus from wasting bits on frequencies that are above
the Nyquist rate of the input signal */
if (st->Fs <= 24000 && st->bandwidth > OPUS_BANDWIDTH_SUPERWIDEBAND)
st->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND;
if (st->Fs <= 16000 && st->bandwidth > OPUS_BANDWIDTH_WIDEBAND)
st->bandwidth = OPUS_BANDWIDTH_WIDEBAND;
if (st->Fs <= 12000 && st->bandwidth > OPUS_BANDWIDTH_MEDIUMBAND)
st->bandwidth = OPUS_BANDWIDTH_MEDIUMBAND;
if (st->Fs <= 8000 && st->bandwidth > OPUS_BANDWIDTH_NARROWBAND)
st->bandwidth = OPUS_BANDWIDTH_NARROWBAND;
if (st->user_bandwidth != OPUS_BANDWIDTH_AUTO)
st->bandwidth = st->user_bandwidth;
/* Can't support higher than wideband for >20 ms frames */
if (frame_size > st->Fs/50 && st->bandwidth > OPUS_BANDWIDTH_WIDEBAND)
st->bandwidth = OPUS_BANDWIDTH_WIDEBAND;
/* CELT mode doesn't support mediumband, use wideband instead */
if (st->mode == MODE_CELT_ONLY && st->bandwidth == OPUS_BANDWIDTH_MEDIUMBAND)
st->bandwidth = OPUS_BANDWIDTH_WIDEBAND;
/* Chooses the appropriate mode for speech
*NEVER* switch to/from CELT-only mode here as this will */
if (st->mode == MODE_SILK_ONLY && st->bandwidth > OPUS_BANDWIDTH_WIDEBAND)
st->mode = MODE_HYBRID;
if (st->mode == MODE_HYBRID && st->bandwidth <= OPUS_BANDWIDTH_WIDEBAND)
st->mode = MODE_SILK_ONLY;
bytes_target = st->bitrate_bps * frame_size / (st->Fs * 8) - 1;
data += 1;
ec_enc_init(&enc, data, max_data_bytes-1);
/* SILK processing */
if (st->mode != MODE_CELT_ONLY)
{
#ifdef FIXED_POINT
const opus_int16 *pcm_silk;
#else
VARDECL(opus_int16, pcm_silk);
ALLOC(pcm_silk, st->channels*frame_size, opus_int16);
#endif
st->silk_mode.bitRate = st->bitrate_bps - 8*st->Fs/frame_size;
if( st->mode == MODE_HYBRID ) {
st->silk_mode.bitRate /= st->stream_channels;
if( st->bandwidth == OPUS_BANDWIDTH_SUPERWIDEBAND ) {
if( st->Fs == 100 * frame_size ) {
/* 24 kHz, 10 ms */
st->silk_mode.bitRate = ( ( st->silk_mode.bitRate + 2000 + st->use_vbr * 1000 ) * 2 ) / 3;
} else {
/* 24 kHz, 20 ms */
st->silk_mode.bitRate = ( ( st->silk_mode.bitRate + 1000 + st->use_vbr * 1000 ) * 2 ) / 3;
}
} else {
if( st->Fs == 100 * frame_size ) {
/* 48 kHz, 10 ms */
st->silk_mode.bitRate = ( st->silk_mode.bitRate + 8000 + st->use_vbr * 3000 ) / 2;
} else {
/* 48 kHz, 20 ms */
st->silk_mode.bitRate = ( st->silk_mode.bitRate + 9000 + st->use_vbr * 1000 ) / 2;
}
}
st->silk_mode.bitRate *= st->stream_channels;
/* don't let SILK use more than 80% */
if( st->silk_mode.bitRate > ( st->bitrate_bps - 8*st->Fs/frame_size ) * 4/5 ) {
st->silk_mode.bitRate = ( st->bitrate_bps - 8*st->Fs/frame_size ) * 4/5;
}
}
st->silk_mode.payloadSize_ms = 1000 * frame_size / st->Fs;
st->silk_mode.nChannelsAPI = st->channels;
st->silk_mode.nChannelsInternal = st->stream_channels;
if (st->bandwidth == OPUS_BANDWIDTH_NARROWBAND) {
st->silk_mode.desiredInternalSampleRate = 8000;
} else if (st->bandwidth == OPUS_BANDWIDTH_MEDIUMBAND) {
st->silk_mode.desiredInternalSampleRate = 12000;
} else {
SKP_assert( st->mode == MODE_HYBRID || st->bandwidth == OPUS_BANDWIDTH_WIDEBAND );
st->silk_mode.desiredInternalSampleRate = 16000;
}
if( st->mode == MODE_HYBRID ) {
/* Don't allow bandwidth reduction at lowest bitrates in hybrid mode */
st->silk_mode.minInternalSampleRate = 16000;
} else {
st->silk_mode.minInternalSampleRate = 8000;
}
st->silk_mode.maxInternalSampleRate = 16000;
/* Call SILK encoder for the low band */
nBytes = IMIN(1275, max_data_bytes-1);
if (prefill)
{
int zero=0;
#ifdef FIXED_POINT
pcm_silk = st->delay_buffer;
#else
for (i=0;i<st->encoder_buffer*st->channels;i++)
pcm_silk[i] = FLOAT2INT16(st->delay_buffer[i]);
#endif
silk_Encode( silk_enc, &st->silk_mode, pcm_silk, st->encoder_buffer, NULL, &zero, 1 );
}
#ifdef FIXED_POINT
pcm_silk = pcm;
#else
for (i=0;i<frame_size*st->channels;i++)
pcm_silk[i] = FLOAT2INT16(pcm[i]);
#endif
ret = silk_Encode( silk_enc, &st->silk_mode, pcm_silk, frame_size, &enc, &nBytes, 0 );
if( ret ) {
fprintf (stderr, "SILK encode error: %d\n", ret);
/* Handle error */
}
if (nBytes==0)
{
data[-1] = gen_toc(st->mode, st->Fs/frame_size, st->bandwidth, st->stream_channels);
return 1;
}
/* Extract SILK internal bandwidth for signaling in first byte */
if( st->mode == MODE_SILK_ONLY ) {
if( st->silk_mode.internalSampleRate == 8000 ) {
silk_internal_bandwidth = OPUS_BANDWIDTH_NARROWBAND;
} else if( st->silk_mode.internalSampleRate == 12000 ) {
silk_internal_bandwidth = OPUS_BANDWIDTH_MEDIUMBAND;
} else if( st->silk_mode.internalSampleRate == 16000 ) {
silk_internal_bandwidth = OPUS_BANDWIDTH_WIDEBAND;
}
} else {
SKP_assert( st->silk_mode.internalSampleRate == 16000 );
}
}
/* CELT processing */
{
int endband=21;
switch(st->bandwidth)
{
case OPUS_BANDWIDTH_NARROWBAND:
endband = 13;
break;
case OPUS_BANDWIDTH_MEDIUMBAND:
case OPUS_BANDWIDTH_WIDEBAND:
endband = 17;
break;
case OPUS_BANDWIDTH_SUPERWIDEBAND:
endband = 19;
break;
case OPUS_BANDWIDTH_FULLBAND:
endband = 21;
break;
}
celt_encoder_ctl(celt_enc, CELT_SET_END_BAND(endband));
celt_encoder_ctl(celt_enc, CELT_SET_CHANNELS(st->stream_channels));
}
if (st->mode != MODE_SILK_ONLY)
{
celt_encoder_ctl(celt_enc, CELT_SET_VBR(0));
celt_encoder_ctl(celt_enc, CELT_SET_BITRATE(-1));
if (st->prev_mode == MODE_SILK_ONLY)
{
unsigned char dummy[10];
celt_encoder_ctl(celt_enc, CELT_RESET_STATE);
celt_encoder_ctl(celt_enc, CELT_SET_START_BAND(0));
celt_encoder_ctl(celt_enc, CELT_SET_PREDICTION(0));
/* TODO: This wastes CPU a bit compared to just prefilling the buffer */
celt_encode_native(celt_enc, &st->delay_buffer[(st->encoder_buffer-st->delay_compensation-st->Fs/400)*st->channels], st->Fs/400, dummy, 10);
} else {
celt_encoder_ctl(celt_enc, CELT_SET_PREDICTION(2));
}
if (st->mode == MODE_HYBRID)
{
int len;
len = (ec_tell(&enc)+7)>>3;
if( st->use_vbr ) {
nb_compr_bytes = len + bytes_target - (st->silk_mode.bitRate * frame_size) / (8 * st->Fs);
} else {
/* check if SILK used up too much */
nb_compr_bytes = len > bytes_target ? len : bytes_target;
}
} else {
if (st->use_vbr)
{
celt_encoder_ctl(celt_enc, CELT_SET_VBR(1));
celt_encoder_ctl(celt_enc, CELT_SET_VBR_CONSTRAINT(st->vbr_constraint));
celt_encoder_ctl(celt_enc, CELT_SET_BITRATE(st->bitrate_bps));
nb_compr_bytes = max_data_bytes-1;
} else {
nb_compr_bytes = bytes_target;
}
}
} else {
nb_compr_bytes = 0;
}
ALLOC(pcm_buf, IMAX(frame_size, st->Fs/200)*st->channels, opus_val16);
for (i=0;i<IMIN(frame_size, st->delay_compensation)*st->channels;i++)
pcm_buf[i] = st->delay_buffer[(st->encoder_buffer-st->delay_compensation)*st->channels+i];
for (;i<frame_size*st->channels;i++)
pcm_buf[i] = pcm[i-st->delay_compensation*st->channels];
if( st->mode == MODE_HYBRID && st->stream_channels == 2 ) {
/* Apply stereo width reduction (at low bitrates) */
if( st->hybrid_stereo_width_Q14 < (1 << 14) || st->silk_mode.stereoWidth_Q14 < (1 << 14) ) {
int width_Q14, delta_Q14, nSamples_8ms, diff;
nSamples_8ms = ( st->Fs * 8 ) / 1000;
width_Q14 = (1 << 14 ) - st->hybrid_stereo_width_Q14;
delta_Q14 = ( st->hybrid_stereo_width_Q14 - st->silk_mode.stereoWidth_Q14 ) / nSamples_8ms;
for( i = 0; i < nSamples_8ms; i++ ) {
width_Q14 += delta_Q14;
diff = pcm_buf[ 2*i+1 ] - (opus_int32)pcm_buf[ 2*i ];
diff = ( diff * width_Q14 ) >> 15;
pcm_buf[ 2*i ] = (opus_int16)( pcm_buf[ 2*i ] + diff );
pcm_buf[ 2*i+1 ] = (opus_int16)( pcm_buf[ 2*i+1 ] - diff );
}
for( ; i < frame_size; i++ ) {
diff = pcm_buf[ 2*i+1 ] - (opus_int32)pcm_buf[ 2*i ];
diff = ( diff * width_Q14 ) >> 15;
pcm_buf[ 2*i ] = (opus_int16)( pcm_buf[ 2*i ] + diff );
pcm_buf[ 2*i+1 ] = (opus_int16)( pcm_buf[ 2*i+1 ] - diff );
}
st->hybrid_stereo_width_Q14 = st->silk_mode.stereoWidth_Q14;
}
}
if (st->mode != MODE_CELT_ONLY)
{
/* Check if we have a redundant 0-8 kHz band */
ec_enc_bit_logp(&enc, redundancy, 12);
if (redundancy)
{
/* Target the same bit-rate for redundancy as for the rest,
up to a max of 257 bytes */
redundancy_bytes = IMIN(257, st->bitrate_bps/1600);
ec_enc_bit_logp(&enc, celt_to_silk, 1);
if (st->mode == MODE_HYBRID)
ec_enc_uint(&enc, redundancy_bytes-2, 256);
}
start_band = 17;
}
if (st->mode == MODE_SILK_ONLY)
{
ret = (ec_tell(&enc)+7)>>3;
ec_enc_done(&enc);
/*When in LPC only mode it's perfectly
reasonable to strip off trailing zero bytes as
the required range decoder behavior is to
fill these in. This can't be done when the MDCT
modes are used because the decoder needs to know
the actual length for allocation purposes.*/
if(!redundancy)
while(ret>2&&data[ret-1]==0)ret--;
nb_compr_bytes = ret;
} else {
nb_compr_bytes = IMIN(1275-redundancy_bytes, nb_compr_bytes);
ec_enc_shrink(&enc, nb_compr_bytes);
}
/* 5 ms redundant frame for CELT->SILK */
if (redundancy && celt_to_silk)
{
celt_encoder_ctl(celt_enc, CELT_SET_START_BAND(0));
celt_encoder_ctl(celt_enc, CELT_SET_VBR(0));
celt_encode_native(celt_enc, pcm_buf, st->Fs/200, data+nb_compr_bytes, redundancy_bytes);
celt_encoder_ctl(celt_enc, CELT_GET_RANGE(&redundant_rng));
celt_encoder_ctl(celt_enc, CELT_RESET_STATE);
}
celt_encoder_ctl(celt_enc, CELT_SET_START_BAND(start_band));
if (st->mode != MODE_SILK_ONLY)
{
ret = celt_encode_with_ec(celt_enc, pcm_buf, frame_size, NULL, nb_compr_bytes, &enc);
}
/* 5 ms redundant frame for SILK->CELT */
if (redundancy && !celt_to_silk)
{
int N2, N4;
N2 = st->Fs/200;
N4 = st->Fs/400;
celt_encoder_ctl(celt_enc, CELT_RESET_STATE);
celt_encoder_ctl(celt_enc, CELT_SET_START_BAND(0));
celt_encoder_ctl(celt_enc, CELT_SET_PREDICTION(0));
/* TODO: We could speed up prefilling here */
celt_encode_native(celt_enc, pcm_buf+st->channels*(frame_size-N2-N4), N4, data+nb_compr_bytes, redundancy_bytes);
celt_encode_native(celt_enc, pcm_buf+st->channels*(frame_size-N2), N2, data+nb_compr_bytes, redundancy_bytes);
celt_encoder_ctl(celt_enc, CELT_GET_RANGE(&redundant_rng));
}
if (frame_size>st->encoder_buffer)
{
for (i=0;i<st->encoder_buffer*st->channels;i++)
st->delay_buffer[i] = pcm[(frame_size-st->encoder_buffer)*st->channels+i];
} else {
int tmp = st->encoder_buffer-frame_size;
for (i=0;i<tmp*st->channels;i++)
st->delay_buffer[i] = st->delay_buffer[i+frame_size*st->channels];
for (i=0;i<frame_size*st->channels;i++)
st->delay_buffer[tmp*st->channels+i] = pcm[i];
}
/* Signalling the mode in the first byte */
data--;
data[0] = gen_toc(st->mode, st->Fs/frame_size, st->bandwidth, st->stream_channels);
st->rangeFinal = enc.rng ^ redundant_rng;
if (to_celt)
st->prev_mode = MODE_CELT_ONLY;
else
st->prev_mode = st->mode;
st->first = 0;
return ret+1+redundancy_bytes;
}
#ifdef FIXED_POINT
#ifndef DISABLE_FLOAT_API
int opus_encode_float(OpusEncoder *st, const float *pcm, int frame_size,
unsigned char *data, int max_data_bytes)
{
int i, ret;
VARDECL(opus_int16, in);
ALLOC_STACK;
ALLOC(in, frame_size*st->channels, opus_int16);
for (i=0;i<frame_size*st->channels;i++)
in[i] = FLOAT2INT16(pcm[i]);
ret = opus_encode(st, in, frame_size, data, max_data_bytes);
RESTORE_STACK;
return ret;
}
#endif
#else
int opus_encode(OpusEncoder *st, const opus_int16 *pcm, int frame_size,
unsigned char *data, int max_data_bytes)
{
int i, ret;
VARDECL(float, in);
ALLOC_STACK;
ALLOC(in, frame_size*st->channels, float);
for (i=0;i<frame_size*st->channels;i++)
in[i] = (1./32768)*pcm[i];
ret = opus_encode_float(st, in, frame_size, data, max_data_bytes);
RESTORE_STACK;
return ret;
}
#endif
int opus_encoder_ctl(OpusEncoder *st, int request, ...)
{
CELTEncoder *celt_enc;
va_list ap;
va_start(ap, request);
celt_enc = (CELTEncoder*)((char*)st+st->celt_enc_offset);
switch (request)
{
case OPUS_SET_APPLICATION_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->application = value;
}
break;
case OPUS_GET_APPLICATION_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->mode;
}
break;
case OPUS_SET_BITRATE_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value != OPUS_BITRATE_AUTO)
{
if (value <= 0)
goto bad_arg;
else if (value <= 500)
value = 500;
}
st->user_bitrate_bps = value;
}
break;
case OPUS_GET_BITRATE_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->bitrate_bps;
}
break;
case OPUS_SET_FORCE_MONO_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->force_mono = value;
}
break;
case OPUS_GET_FORCE_MONO_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = !!st->force_mono;
}
break;
case OPUS_SET_BANDWIDTH_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value < OPUS_BANDWIDTH_AUTO || value > OPUS_BANDWIDTH_FULLBAND)
return OPUS_BAD_ARG;
st->user_bandwidth = value;
if (st->user_bandwidth == OPUS_BANDWIDTH_NARROWBAND) {
st->silk_mode.maxInternalSampleRate = 8000;
} else if (st->bandwidth == OPUS_BANDWIDTH_MEDIUMBAND) {
st->silk_mode.maxInternalSampleRate = 12000;
} else {
st->silk_mode.maxInternalSampleRate = 16000;
}
}
break;
case OPUS_GET_BANDWIDTH_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->bandwidth;
}
break;
case OPUS_SET_DTX_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->silk_mode.useDTX = value;
}
break;
case OPUS_GET_DTX_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->silk_mode.useDTX;
}
break;
case OPUS_SET_COMPLEXITY_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->silk_mode.complexity = value;
celt_encoder_ctl(celt_enc, CELT_SET_COMPLEXITY(value));
}
break;
case OPUS_GET_COMPLEXITY_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->silk_mode.complexity;
}
break;
case OPUS_SET_INBAND_FEC_FLAG_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->silk_mode.useInBandFEC = value;
}
break;
case OPUS_GET_INBAND_FEC_FLAG_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->silk_mode.useInBandFEC;
}
break;
case OPUS_SET_PACKET_LOSS_PERC_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value < 0 || value > 100)
return OPUS_BAD_ARG;
st->silk_mode.packetLossPercentage = value;
celt_encoder_ctl(celt_enc, CELT_SET_LOSS_PERC(value));
}
break;
case OPUS_GET_PACKET_LOSS_PERC_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->silk_mode.packetLossPercentage;
}
break;
case OPUS_SET_VBR_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->use_vbr = value;
st->silk_mode.useCBR = 1-value;
}
break;
case OPUS_GET_VBR_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->use_vbr;
}
break;
case OPUS_SET_VOICE_RATIO_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
if (value>100 || value<0)
goto bad_arg;
st->voice_ratio = value;
}
break;
case OPUS_GET_VOICE_RATIO_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->voice_ratio;
}
break;
case OPUS_SET_VBR_CONSTRAINT_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->vbr_constraint = value;
}
break;
case OPUS_GET_VBR_CONSTRAINT_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->vbr_constraint;
}
break;
case OPUS_SET_SIGNAL_REQUEST:
{
opus_int32 value = va_arg(ap, opus_int32);
st->signal_type = value;
}
break;
case OPUS_GET_SIGNAL_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->signal_type;
}
break;
case OPUS_GET_LOOKAHEAD_REQUEST:
{
opus_int32 *value = va_arg(ap, opus_int32*);
*value = st->delay_compensation+st->Fs/400;
}
break;
case OPUS_GET_FINAL_RANGE_REQUEST:
{
opus_uint32 *value = va_arg(ap, opus_uint32*);
*value = st->rangeFinal;
}
break;
default:
fprintf(stderr, "unknown opus_encoder_ctl() request: %d", request);
break;
}
va_end(ap);
return OPUS_OK;
bad_arg:
va_end(ap);
return OPUS_BAD_ARG;
}
void opus_encoder_destroy(OpusEncoder *st)
{
free(st);
}