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/*
* Siren Encoder/Decoder library
*
* @author: Youness Alaoui <kakaroto@kakaroto.homelinux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "siren7.h"
SirenEncoder Siren7_NewEncoder(int sample_rate) {
SirenEncoder encoder = (SirenEncoder) malloc(sizeof(struct stSirenEncoder));
encoder->sample_rate = sample_rate;
encoder->WavHeader.riff.RiffId = ME_TO_LE32(RIFF_ID);
encoder->WavHeader.riff.RiffSize = sizeof(SirenWavHeader) - 2*sizeof(int);
encoder->WavHeader.riff.RiffSize = ME_TO_LE32(encoder->WavHeader.riff.RiffSize);
encoder->WavHeader.WaveId = ME_TO_LE32(WAVE_ID);
encoder->WavHeader.FmtId = ME_TO_LE32(FMT__ID);
encoder->WavHeader.FmtSize = ME_TO_LE32(sizeof(SirenFmtChunk));
encoder->WavHeader.fmt.fmt.Format = ME_TO_LE16(0x028E);
encoder->WavHeader.fmt.fmt.Channels = ME_TO_LE16(1);
encoder->WavHeader.fmt.fmt.SampleRate = ME_TO_LE32(16000);
encoder->WavHeader.fmt.fmt.ByteRate = ME_TO_LE32(2000);
encoder->WavHeader.fmt.fmt.BlockAlign = ME_TO_LE16(40);
encoder->WavHeader.fmt.fmt.BitsPerSample = ME_TO_LE16(0);
encoder->WavHeader.fmt.ExtraSize = ME_TO_LE16(2);
encoder->WavHeader.fmt.DctLength = ME_TO_LE16(320);
encoder->WavHeader.FactId = ME_TO_LE32(FACT_ID);
encoder->WavHeader.FactSize = ME_TO_LE32(sizeof(int));
encoder->WavHeader.Samples = ME_TO_LE32(0);
encoder->WavHeader.DataId = ME_TO_LE32(DATA_ID);
encoder->WavHeader.DataSize = ME_TO_LE32(0);
memset(encoder->context, 0, sizeof(encoder->context));
siren_init();
return encoder;
}
void Siren7_CloseEncoder(SirenEncoder encoder) {
free(encoder);
}
int Siren7_EncodeFrame(SirenEncoder encoder, unsigned char *DataIn, unsigned char *DataOut) {
int number_of_coefs,
sample_rate_bits,
rate_control_bits,
rate_control_possibilities,
checksum_bits,
esf_adjustment,
scale_factor,
number_of_regions,
sample_rate_code,
bits_per_frame;
int sample_rate = encoder->sample_rate;
static int absolute_region_power_index[28] = {0};
static int power_categories[28] = {0};
static int category_balance[28] = {0};
static int drp_num_bits[30] = {0};
static int drp_code_bits[30] = {0};
static int region_mlt_bit_counts[28] = {0};
static int region_mlt_bits[112] = {0};
int ChecksumTable[4] = {0x7F80, 0x7878, 0x6666, 0x5555};
int i, j;
int dwRes = 0;
short out_word;
int bits_left;
int current_word_bits_left;
int region_bit_count;
unsigned int current_word;
unsigned int sum;
unsigned int checksum;
int temp1 = 0;
int temp2 = 0;
int region;
int idx = 0;
int envelope_bits = 0;
int rate_control;
int number_of_available_bits;
float coefs[320];
float In[320];
short BufferOut[20];
float *context = encoder->context;
for (i = 0; i < 320; i++)
In[i] = (float) ((short) ME_FROM_LE16(((short *) DataIn)[i]));
dwRes = siren_rmlt_encode_samples(In, context, 320, coefs);
if (dwRes != 0)
return dwRes;
dwRes = GetSirenCodecInfo(1, sample_rate, &number_of_coefs, &sample_rate_bits, &rate_control_bits, &rate_control_possibilities, &checksum_bits, &esf_adjustment, &scale_factor, &number_of_regions, &sample_rate_code, &bits_per_frame );
if (dwRes != 0)
return dwRes;
envelope_bits = compute_region_powers(number_of_regions, coefs, drp_num_bits, drp_code_bits, absolute_region_power_index, esf_adjustment);
number_of_available_bits = bits_per_frame - rate_control_bits - envelope_bits - sample_rate_bits - checksum_bits ;
categorize_regions(number_of_regions, number_of_available_bits, absolute_region_power_index, power_categories, category_balance);
for(region = 0; region < number_of_regions; region++) {
absolute_region_power_index[region] += 24;
region_mlt_bit_counts[region] = 0;
}
rate_control = quantize_mlt(number_of_regions, rate_control_possibilities, number_of_available_bits, coefs, absolute_region_power_index, power_categories, category_balance, region_mlt_bit_counts, region_mlt_bits);
idx = 0;
bits_left = 16 - sample_rate_bits;
out_word = sample_rate_code << (16 - sample_rate_bits);
drp_num_bits[number_of_regions] = rate_control_bits;
drp_code_bits[number_of_regions] = rate_control;
for (region = 0; region <= number_of_regions; region++) {
i = drp_num_bits[region] - bits_left;
if (i < 0) {
out_word += drp_code_bits[region] << -i;
bits_left -= drp_num_bits[region];
} else {
BufferOut[idx++] = out_word + (drp_code_bits[region] >> i);
bits_left += 16 - drp_num_bits[region];
out_word = drp_code_bits[region] << bits_left;
}
}
for (region = 0; region < number_of_regions && (16*idx) < bits_per_frame; region++) {
current_word_bits_left = region_bit_count = region_mlt_bit_counts[region];
if (current_word_bits_left > 32)
current_word_bits_left = 32;
current_word = region_mlt_bits[region*4];
i = 1;
while(region_bit_count > 0 && (16*idx) < bits_per_frame) {
if (current_word_bits_left < bits_left) {
bits_left -= current_word_bits_left;
out_word += (current_word >> (32 - current_word_bits_left)) << bits_left;
current_word_bits_left = 0;
} else {
BufferOut[idx++] = (short) (out_word + (current_word >> (32 - bits_left)));
current_word_bits_left -= bits_left;
current_word <<= bits_left;
bits_left = 16;
out_word = 0;
}
if (current_word_bits_left == 0) {
region_bit_count -= 32;
current_word = region_mlt_bits[(region*4) + i++];
current_word_bits_left = region_bit_count;
if (current_word_bits_left > 32)
current_word_bits_left = 32;
}
}
}
while ( (16*idx) < bits_per_frame) {
BufferOut[idx++] = (short) ((0xFFFF >> (16 - bits_left)) + out_word);
bits_left = 16;
out_word = 0;
}
if (checksum_bits > 0) {
BufferOut[idx-1] &= (-1 << checksum_bits);
sum = 0;
idx = 0;
do {
sum ^= (BufferOut[idx] & 0xFFFF) << (idx % 15);
} while ((16*++idx) < bits_per_frame);
sum = (sum >> 15) ^ (sum & 0x7FFF);
checksum = 0;
for (i = 0; i < 4; i++) {
temp1 = ChecksumTable[i] & sum;
for (j = 8; j > 0; j >>= 1) {
temp2 = temp1 >> j;
temp1 ^= temp2;
}
checksum <<= 1;
checksum |= temp1 & 1;
}
BufferOut[idx-1] |= ((1 << checksum_bits) -1) & checksum;
}
for (i = 0; i < 20; i++)
#ifdef __BIG_ENDIAN__
((short *) DataOut)[i] = BufferOut[i];
#else
((short *) DataOut)[i] = ((BufferOut[i] << 8) & 0xFF00) | ((BufferOut[i] >> 8) & 0x00FF);
#endif
encoder->WavHeader.Samples = ME_FROM_LE32(encoder->WavHeader.Samples);
encoder->WavHeader.Samples += 320;
encoder->WavHeader.Samples = ME_TO_LE32(encoder->WavHeader.Samples);
encoder->WavHeader.DataSize = ME_FROM_LE32(encoder->WavHeader.DataSize);
encoder->WavHeader.DataSize += 40;
encoder->WavHeader.DataSize = ME_TO_LE32(encoder->WavHeader.DataSize);
encoder->WavHeader.riff.RiffSize = ME_FROM_LE32(encoder->WavHeader.riff.RiffSize);
encoder->WavHeader.riff.RiffSize += 40;
encoder->WavHeader.riff.RiffSize = ME_TO_LE32(encoder->WavHeader.riff.RiffSize);
return 0;
}
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