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// https://github.com/technosaurus/PDMP3
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// License: Public Domain
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#include "pdmp3.h"
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <math.h>
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#include <unistd.h>
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#include <stdlib.h>
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#define C_EOF 0xffffffff
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#define C_PI 3.14159265358979323846
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#define C_INV_SQRT_2 0.70710678118654752440
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#define Hz 1
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#define kHz 1000*Hz
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#define bit_s 1
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#define kbit_s 1000*bit_s
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#define FRAG_SIZE_LN2 0x0011 /* 2^17=128kb */
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#define FRAG_NUMS 0x0004
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#define DBG(str,args...) { printf(str,## args); printf("\n"); }
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#define ERR(str,args...) { fprintf(stderr,str,## args) ; fprintf(stderr,"\n"); }
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#define EXIT(str,args...) { printf(str,## args); printf("\n"); exit(0); }
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#ifdef DEBUG //debug functions
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static void dmp_fr(t_mpeg1_header *hdr);
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static void dmp_si(t_mpeg1_header *hdr,t_mpeg1_side_info *si);
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static void dmp_scf(t_mpeg1_side_info *si,t_mpeg1_main_data *md,int gr,int ch);
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static void dmp_huff(t_mpeg1_main_data *md,int gr,int ch);
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static void dmp_samples(t_mpeg1_main_data *md,int gr,int ch,int type);
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#else
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#define dmp_fr(...) do{}while(0)
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#define dmp_si(...) do{}while(0)
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#define dmp_scf(...) do{}while(0)
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#define dmp_huff(...) do{}while(0)
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#define dmp_samples(...) do{}while(0)
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#endif
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static void audio_write(unsigned *samples,unsigned nsamples,int sample_rate);
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static void audio_write_raw(unsigned *samples,unsigned nsamples);
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static void Error(const char *s,int e);
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static const unsigned g_mpeg1_bitrates[3 /* layer 1-3 */][15 /* header bitrate_index */] = {
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{ /* Layer 1 */
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0, 32000, 64000, 96000,128000,160000,192000,224000,
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256000,288000,320000,352000,384000,416000,448000
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},{ /* Layer 2 */
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0, 32000, 48000, 56000, 64000, 80000, 96000,112000,
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128000,160000,192000,224000,256000,320000,384000
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},{ /* Layer 3 */
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0, 32000, 40000, 48000, 56000, 64000, 80000, 96000,
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112000,128000,160000,192000,224000,256000,320000
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}
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},
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g_sampling_frequency[3] = { 44100 * Hz,48000 * Hz,32000 * Hz };
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unsigned synth_init = 1;
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#ifdef DEBUG
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static void dmp_fr(t_mpeg1_header *hdr){
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printf("rate %d,sfreq %d,pad %d,mod %d,modext %d,emph %d\n",
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hdr->bitrate_index,hdr->sampling_frequency,hdr->padding_bit,
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hdr->mode,hdr->mode_extension,hdr->emphasis);
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}
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static void dmp_si(t_mpeg1_header *hdr,t_mpeg1_side_info *si){
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int nch,ch,gr;
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nch = hdr->mode == mpeg1_mode_single_channel ? 1 : 2;
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printf("main_data_begin %d,priv_bits %d\n",si->main_data_begin,si->private_bits);
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for(ch = 0; ch < nch; ch++) {
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printf("scfsi %d %d %d %d\n",si->scfsi[ch][0],si->scfsi[ch][1],si->scfsi[ch][2],si->scfsi[ch][3]);
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for(gr = 0; gr < 2; gr++) {
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printf("p23l %d,bv %d,gg %d,scfc %d,wsf %d,bt %d\n",
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si->part2_3_length[gr][ch],si->big_values[gr][ch],
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si->global_gain[gr][ch],si->scalefac_compress[gr][ch],
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si->win_switch_flag[gr][ch],si->block_type[gr][ch]);
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if(si->win_switch_flag[gr][ch]) {
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printf("mbf %d,ts1 %d,ts2 %d,sbg1 %d,sbg2 %d,sbg3 %d\n",
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si->mixed_block_flag[gr][ch],si->table_select[gr][ch][0],
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si->table_select[gr][ch][1],si->subblock_gain[gr][ch][0],
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si->subblock_gain[gr][ch][1],si->subblock_gain[gr][ch][2]);
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}else{
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printf("ts1 %d,ts2 %d,ts3 %d\n",si->table_select[gr][ch][0],
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si->table_select[gr][ch][1],si->table_select[gr][ch][2]);
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}
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printf("r0c %d,r1c %d\n",si->region0_count[gr][ch],si->region1_count[gr][ch]);
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printf("pf %d,scfs %d,c1ts %d\n",si->preflag[gr][ch],si->scalefac_scale[gr][ch],si->count1table_select[gr][ch]);
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}
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}
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}
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static void dmp_scf(t_mpeg1_side_info *si,t_mpeg1_main_data *md,int gr,int ch){
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int sfb,win;
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if((si->win_switch_flag[gr][ch] != 0) &&(si->block_type[gr][ch] == 2)) {
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if(si->mixed_block_flag[gr][ch] != 0) { /* First the long block scalefacs */
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for(sfb = 0; sfb < 8; sfb++)
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printf("scfl%d %d%s",sfb,md->scalefac_l[gr][ch][sfb],(sfb==7)?"\n":",");
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for(sfb = 3; sfb < 12; sfb++) /* And next the short block scalefacs */
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for(win = 0; win < 3; win++)
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printf("scfs%d,%d %d%s",sfb,win,md->scalefac_s[gr][ch][sfb][win],(win==2)?"\n":",");
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}else{ /* Just short blocks */
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for(sfb = 0; sfb < 12; sfb++)
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for(win = 0; win < 3; win++)
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printf("scfs%d,%d %d%s",sfb,win,md->scalefac_s[gr][ch][sfb][win],(win==2)?"\n":",");
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}
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}else for(sfb = 0; sfb < 21; sfb++) /* Just long blocks; scalefacs first */
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printf("scfl%d %d%s",sfb,md->scalefac_l[gr][ch][sfb], (sfb == 20)?"\n":",");
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}
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static void dmp_huff(t_mpeg1_main_data *md,int gr,int ch){
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int i;
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printf("HUFFMAN\n");
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for(i = 0; i < 576; i++) printf("%d: %d\n",i,(int) md->is[gr][ch][i]);
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}
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static void dmp_samples(t_mpeg1_main_data *md,int gr,int ch,int type){
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int i,val;
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extern double rint(double);
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printf("SAMPLES%d\n",type);
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for(i = 0; i < 576; i++) {
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val =(int) rint(md->is[gr][ch][i] * 32768.0);
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if(val >= 32768) val = 32767;
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if(val < -32768) val = -32768;
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printf("%d: %d\n",i,val);
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}
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}
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#endif
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/**Description: TBD
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* Parameters: TBD
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* Return value: TBD
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* Author: Krister Lagerström(krister@kmlager.com) **/
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static void Error(const char *s,int e){
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(void) fwrite(s,1,strlen(s),stderr);
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exit(e);
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}
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Hajime Hoshi