/* Compute default encoding values. */
shine_global_config *shine_initialise(shine_config_t *pub_config)
{
double avg_slots_per_frame;
shine_global_config *config;
config = calloc(1,sizeof(shine_global_config));
if (config == NULL)
return config;
shine_subband_initialise(config);
shine_mdct_initialise(config);
shine_loop_initialise(config);
shine_formatbits_initialise(config);
shine_bitstream_initialise(config );
/* Copy public config. */
config->wave.channels = pub_config->wave.channels;
config->wave.samplerate = pub_config->wave.samplerate;
config->mpeg.mode = pub_config->mpeg.mode;
config->mpeg.bitr = pub_config->mpeg.bitr;
config->mpeg.emph = pub_config->mpeg.emph;
config->mpeg.copyright = pub_config->mpeg.copyright;
config->mpeg.original = pub_config->mpeg.original;
/* Set default values. */
config->ResvMax = 0;
config->ResvSize = 0;
config->mpeg.crc = 0;
config->mpeg.ext = 0;
config->mpeg.mode_ext = 0;
config->mpeg.bits_per_slot = 8;
/* Figure average number of 'slots' per frame. */
avg_slots_per_frame = ((double)samp_per_frame /
((double)config->wave.samplerate/1000)) *
((double)config->mpeg.bitr /
(double)config->mpeg.bits_per_slot);
config->mpeg.whole_slots_per_frame = (int)avg_slots_per_frame;
config->mpeg.frac_slots_per_frame = avg_slots_per_frame - (double)config->mpeg.whole_slots_per_frame;
config->mpeg.slot_lag = -config->mpeg.frac_slots_per_frame;
if(config->mpeg.frac_slots_per_frame==0)
config->mpeg.padding = 0;
config->mpeg.samplerate_index = shine_find_samplerate_index(config->wave.samplerate);
config->mpeg.bitrate_index = shine_find_bitrate_index(config->mpeg.bitr)+1;
shine_open_bit_stream(&config->bs, BUFFER_SIZE);
memset((char *)&config->side_info,0,sizeof(shine_side_info_t));
config->sideinfo_len = (config->wave.channels==1) ? 168 : 288;
return config;
}
/* Compute default encoding values. */
shine_global_config *shine_initialise(shine_config_t *pub_config)
{
double avg_slots_per_frame;
shine_global_config *config;
if (shine_check_config(pub_config->wave.samplerate, pub_config->mpeg.bitr) < 0)
return NULL;
config = calloc(1,sizeof(shine_global_config));
if (config == NULL)
return config;
shine_subband_initialise(config);
shine_mdct_initialise(config);
shine_loop_initialise(config);
shine_formatbits_initialise(config);
shine_bitstream_initialise(config );
/* Copy public config. */
config->wave.channels = pub_config->wave.channels;
config->wave.samplerate = pub_config->wave.samplerate;
config->mpeg.mode = pub_config->mpeg.mode;
config->mpeg.bitr = pub_config->mpeg.bitr;
config->mpeg.emph = pub_config->mpeg.emph;
config->mpeg.copyright = pub_config->mpeg.copyright;
config->mpeg.original = pub_config->mpeg.original;
/* Set default values. */
config->ResvMax = 0;
config->ResvSize = 0;
config->mpeg.layer = LAYER_III;
config->mpeg.crc = 0;
config->mpeg.ext = 0;
config->mpeg.mode_ext = 0;
config->mpeg.bits_per_slot = 8;
config->mpeg.samplerate_index = shine_find_samplerate_index(config->wave.samplerate);
config->mpeg.version = shine_mpeg_version(config->mpeg.samplerate_index);
config->mpeg.bitrate_index = shine_find_bitrate_index(config->mpeg.bitr, config->mpeg.version);
config->mpeg.granules_per_frame = granules_per_frame[config->mpeg.version];
/* Figure average number of 'slots' per frame. */
avg_slots_per_frame = ((double)config->mpeg.granules_per_frame * GRANULE_SIZE /
((double)config->wave.samplerate)) *
(1000*(double)config->mpeg.bitr /
(double)config->mpeg.bits_per_slot);
config->mpeg.whole_slots_per_frame = (int)avg_slots_per_frame;
config->mpeg.frac_slots_per_frame = avg_slots_per_frame - (double)config->mpeg.whole_slots_per_frame;
config->mpeg.slot_lag = -config->mpeg.frac_slots_per_frame;
if(config->mpeg.frac_slots_per_frame==0)
config->mpeg.padding = 0;
shine_open_bit_stream(&config->bs, BUFFER_SIZE);
memset((char *)&config->side_info,0,sizeof(shine_side_info_t));
/* determine the mean bitrate for main data */
if (config->mpeg.granules_per_frame == 2) /* MPEG 1 */
config->sideinfo_len = 8 * ((config->wave.channels==1) ? 4 + 17 : 4 + 32);
else /* MPEG 2 */
config->sideinfo_len = 8 * ((config->wave.channels==1) ? 4 + 9 : 4 + 17);
return config;
}
