/*
* L3_compress:
* ------------
*/
void L3_compress(config_t *config)
{
int frames_processed;
int channel;
int i;
int gr;
double pe[2][2];
short *buffer_window[2];
double avg_slots_per_frame;
double frac_slots_per_frame;
long whole_slots_per_frame;
double slot_lag;
int mean_bits;
int sideinfo_len;
static short buffer[2][samp_per_frame];
static int l3_enc[2][2][samp_per_frame2];
static long l3_sb_sample[2][3][18][SBLIMIT];
static long mdct_freq[2][2][samp_per_frame2];
static L3_psy_ratio_t ratio;
static L3_side_info_t side_info;
static L3_scalefac_t scalefactor;
static bitstream_t bs;
open_bit_stream_w(&bs, config->outfile, BUFFER_SIZE);
memset((char *)&side_info,0,sizeof(L3_side_info_t));
L3_subband_initialise();
L3_mdct_initialise();
L3_loop_initialise();
config->mpeg.samples_per_frame = samp_per_frame;
config->mpeg.total_frames = config->wave.total_samples/config->mpeg.samples_per_frame;
config->mpeg.bits_per_slot = 8;
frames_processed = 0;
sideinfo_len = (config->wave.channels==1) ? 168 : 288;
/* Figure average number of 'slots' per frame. */
avg_slots_per_frame = ((double)config->mpeg.samples_per_frame /
((double)config->wave.samplerate/1000)) *
((double)config->mpeg.bitr /
(double)config->mpeg.bits_per_slot);
whole_slots_per_frame = (int)avg_slots_per_frame;
frac_slots_per_frame = avg_slots_per_frame - (double)whole_slots_per_frame;
slot_lag = -frac_slots_per_frame;
if(frac_slots_per_frame==0)
config->mpeg.padding = 0;
while(config->get_pcm(buffer, config))
{
update_status(++frames_processed, config);
buffer_window[0] = buffer[0];
buffer_window[1] = buffer[1];
if(frac_slots_per_frame)
{
if(slot_lag>(frac_slots_per_frame-1.0))
{ /* No padding for this frame */
slot_lag -= frac_slots_per_frame;
config->mpeg.padding = 0;
}
else
{ /* Padding for this frame */
slot_lag += (1-frac_slots_per_frame);
config->mpeg.padding = 1;
}
}
config->mpeg.bits_per_frame = 8*(whole_slots_per_frame + config->mpeg.padding);
mean_bits = (config->mpeg.bits_per_frame - sideinfo_len)>>1;
/* polyphase filtering */
for(gr=0;gr<2;gr++)
for(channel=config->wave.channels; channel--; )
for(i=0;i<18;i++)
L3_window_filter_subband(&buffer_window[channel], &l3_sb_sample[channel][gr+1][i][0] ,channel);
/* apply mdct to the polyphase output */
L3_mdct_sub(l3_sb_sample, mdct_freq, config);
/* bit and noise allocation */
L3_iteration_loop(pe,mdct_freq,&ratio,&side_info, l3_enc, mean_bits,&scalefactor, config);
/* write the frame to the bitstream */
L3_format_bitstream(l3_enc,&side_info,&scalefactor, &bs,mdct_freq,NULL,0, config);
}
close_bit_stream(&bs);
}
/*! Compress a given smplFrame at a given bitRate
*
* \param smplFrame a buffer containing samples to be compressed to layer3
* \param cfg pointer to an initialized config_t structure
* \param bitRate bitRate to encode sample at
* \return status :
* - 0 => Success
* < 0 => any error code
*/
int kb_mp3_Compress( unsigned short *smplFrame, unsigned long smplNmbr, struct config_t *cfg, int bitRate,
char *filePath )
{
int frames_processed;
int channel;
int i;
int gr;
double pe[2][2];
short *buffer_window[2];
double avg_slots_per_frame;
double frac_slots_per_frame;
long whole_slots_per_frame;
double slot_lag;
int mean_bits;
int sideinfo_len;
static short buffer[2][samp_per_frame];
static int l3_enc[2][2][samp_per_frame2];
static long l3_sb_sample[2][3][18][SBLIMIT];
static long mdct_freq[2][2][samp_per_frame2];
static L3_psy_ratio_t ratio;
static L3_side_info_t side_info;
static L3_scalefac_t scalefactor;
static bitstream_t bs;
if(cfg)
cfg->mpeg.bitr = bitRate; /* Override the default bitRate */
if(filePath && cfg)
cfg->outfile = filePath;
else
return -1; /* outfile related error */
open_bit_stream_w(&bs, cfg->outfile, BUFFER_SIZE);
memset((char *)&side_info,0,sizeof(L3_side_info_t));
/* some mpeg layer 3 initialisations */
L3_subband_initialise();
L3_mdct_initialise();
L3_loop_initialise();
cfg->mpeg.samples_per_frame = samp_per_frame;
cfg->mpeg.total_frames = smplNmbr /cfg->mpeg.samples_per_frame;
cfg->mpeg.bits_per_slot = 8;
frames_processed = 0;
sideinfo_len = 288; /* Stereo assumed */ /* (config.wave.channels==1) ? 168 : 288; */
/* Figure average number of 'slots' per frame. */
avg_slots_per_frame = ((double)cfg->mpeg.samples_per_frame /
((double)smplNmbr/1000)) *
((double)cfg->mpeg.bitr /
(double)cfg->mpeg.bits_per_slot);
whole_slots_per_frame = (int)avg_slots_per_frame;
frac_slots_per_frame = avg_slots_per_frame - (double)whole_slots_per_frame;
slot_lag = -frac_slots_per_frame;
if(frac_slots_per_frame==0)
cfg->mpeg.padding = 0;
//while(wave_get(buffer))
for( i = 0; i < smplNmbr; i++)
{
kb_mp3_updStatus(cfg, ++frames_processed);
buffer_window[0] = buffer[0];
buffer_window[1] = buffer[1];
if(frac_slots_per_frame)
if(slot_lag>(frac_slots_per_frame-1.0))
{ /* No padding for this frame */
slot_lag -= frac_slots_per_frame;
cfg->mpeg.padding = 0;
}
else
{ /* Padding for this frame */
slot_lag += (1-frac_slots_per_frame);
cfg->mpeg.padding = 1;
}
cfg->mpeg.bits_per_frame = 8*(whole_slots_per_frame + cfg->mpeg.padding);
mean_bits = (cfg->mpeg.bits_per_frame - sideinfo_len)>>1;
/* polyphase filtering */
for(gr=0;gr<2;gr++)
for(channel=2; channel-- ; ) /* assumed stereo */ /* for(channel=cfg->wave.channels; channel--; ) */
for(i=0;i<18;i++)
L3_window_filter_subband(&buffer_window[channel], &l3_sb_sample[channel][gr+1][i][0] ,channel);
/* apply mdct to the polyphase output */
L3_mdct_sub(cfg, l3_sb_sample, mdct_freq);
/* bit and noise allocation */
L3_iteration_loop(cfg, pe,mdct_freq,&ratio,&side_info, l3_enc, mean_bits,&scalefactor);
/* write the frame to the bitstream */
L3_format_bitstream(cfg, l3_enc,&side_info,&scalefactor, &bs,mdct_freq,NULL,0);
}
close_bit_stream(&bs);
}
MP3Stream::MP3Stream(StreamsManager *pStreamsManager, string name)
: BaseAudioStream(pStreamsManager, ST_IN_AUDIO_MP3, name)
{
BaseAudioDevice *pAudioCapDevice= reinterpret_cast<BaseAudioDevice*> (HardwareManager::GetHardwareInstance(HT_MIC));
_pMP3streamCapabilities= new StreamCapabilities();
//pcmbuf = new uint8_t (PCM_PAGE_SIZE);
//mp3 config
L3_set_config_mpeg_defaults(&_mp3config.mpeg);
//wave config
_sampleRate = pAudioCapDevice->GetSampleRate();
_numOfChannel = pAudioCapDevice->GetNumberOfChannels();
_bitsPerSample = pAudioCapDevice->GetBitsPerSample();
_bitRate = _mp3config.mpeg.bitr;//
//set wave type, TODO: removed
_mp3config.wave.type = WAVE_RIFF_PCM;
_mp3config.wave.channels = _numOfChannel; //mono
_mp3config.wave.samplerate = _sampleRate;
_mp3config.wave.bits = _bitsPerSample;
//config sample rate index, and bit rate
_mp3config.mpeg.samplerate_index = L3_find_samplerate_index(_sampleRate, _mp3config.mpeg.type);
if ( _mp3config.mpeg.samplerate_index < 0)
FATAL ("invalid sample rate in mp3stream ctor"); //TODO: should throw an execption
_mp3config.mpeg.bitrate_index = L3_find_bitrate_index(_mp3config.mpeg.bitr, _mp3config.mpeg.type);
if (_mp3config.mpeg.bitrate_index < 0)
FATAL ("invliad bit rate in mpstream ctor");
open_bit_stream_w(&_bs, BITSSIZE);
memset ((char*) &_side_info, 0, sizeof(L3_side_info_t));
L3_subband_initialise();
L3_mdct_initialise();
L3_loop_initialise();
_mp3config.mpeg.mode_gr = (_mp3config.mpeg.type==1)? 2: 1;
_samplesInput = _mp3config.mpeg.samples_per_frame = (_mp3config.mpeg.type==1)? 1152:576;
//config->mpeg.total_frames = ();
_mp3config.mpeg.bits_per_slot = 8;
_sideinfo_len = 32;
if (_mp3config.mpeg.type==1) {
if (_numOfChannel==1)
_sideinfo_len += 136;
else
_sideinfo_len += 256;
}
else { //mpeg2
if (_numOfChannel==1)
_sideinfo_len += 72;
else
_sideinfo_len += 136;
}
if (_mp3config.mpeg.crc) _sideinfo_len += 16;
_avg_slots_per_frame = ((double)_samplesInput /
((double)_sampleRate/1000)) *
((double)_bitRate /
(double)_mp3config.mpeg.bits_per_slot);
_whole_slots_per_frame = (int)_avg_slots_per_frame;
_frac_slots_per_frame = _avg_slots_per_frame - (double)_whole_slots_per_frame;
_slot_lag = -_frac_slots_per_frame;
if (_frac_slots_per_frame==0)
_mp3config.mpeg.padding = 0;
DEBUG ("mp3 stream info: _sideinfo_len:%d sampleInput:%d bitRate:%d sampleRate:%d avg slots per frame:%d",
_sideinfo_len,
_samplesInput,
_bitRate,
_sampleRate,
_avg_slots_per_frame);
GETTIMESTAMP(ats);
mp3Duration=(1000.0/(double)_sampleRate)*(double)(_samplesInput/_numOfChannel); //m second
_pMP3streamCapabilities->aac.InitAACCapability(_sampleRate, _numOfChannel, _bitsPerSample, (samplesInput/_numOfChannel),
(_bitRate* 1000 *_numOfChannel), mp3Duration); //bitrate: 2 channel
_pMP3streamCapabilities->audioCodecId = CODEC_AUDIO_MP3;
#ifdef MP3STREAM_DEBUG
if((pfOutputMP3=fopen("MICOut.mp3", "wb")) == NULL){
FATAL("Open output file 'MICOut.mp3' fail... !!\n");
exit(1);
}
if((pfPCM=fopen("MICOut.wav", "wb")) == NULL){
FATAL("Open output file 'MICOut.mp3' fail... !!\n");
exit(1);
}
DEBUG("Initial MP3Stream End..!!\n");
#endif
}
