diff options
Diffstat (limited to 'addons/mp3/common.c')
| -rw-r--r-- | addons/mp3/common.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/addons/mp3/common.c b/addons/mp3/common.c new file mode 100644 index 000000000..d8db2a3d2 --- /dev/null +++ b/addons/mp3/common.c @@ -0,0 +1,267 @@ +#include <asterisk.h> +#include <asterisk/logger.h> + +#include <ctype.h> +#include <stdlib.h> +#include <signal.h> + +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +#include "mpg123.h" +#include "mpglib.h" + +struct parameter param = { 1 , 1 , 0 , 0 }; + +int tabsel_123[2][3][16] = { + { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,}, + {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,}, + {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} }, + + { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,}, + {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,}, + {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} } +}; + +long freqs[9] = { 44100, 48000, 32000, + 22050, 24000, 16000 , + 11025 , 12000 , 8000 }; + + +#if 0 +static void get_II_stuff(struct frame *fr) +{ + static int translate[3][2][16] = + { { { 0,2,2,2,2,2,2,0,0,0,1,1,1,1,1,0 } , + { 0,2,2,0,0,0,1,1,1,1,1,1,1,1,1,0 } } , + { { 0,2,2,2,2,2,2,0,0,0,0,0,0,0,0,0 } , + { 0,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0 } } , + { { 0,3,3,3,3,3,3,0,0,0,1,1,1,1,1,0 } , + { 0,3,3,0,0,0,1,1,1,1,1,1,1,1,1,0 } } }; + + int table,sblim; + static struct al_table *tables[5] = + { alloc_0, alloc_1, alloc_2, alloc_3 , alloc_4 }; + static int sblims[5] = { 27 , 30 , 8, 12 , 30 }; + + if(fr->lsf) + table = 4; + else + table = translate[fr->sampling_frequency][2-fr->stereo][fr->bitrate_index]; + sblim = sblims[table]; + + fr->alloc = tables[table]; + fr->II_sblimit = sblim; +} +#endif + +#define HDRCMPMASK 0xfffffd00 + +#if 0 +int head_check(unsigned long head) +{ + if( (head & 0xffe00000) != 0xffe00000) + return FALSE; + if(!((head>>17)&3)) + return FALSE; + if( ((head>>12)&0xf) == 0xf) + return FALSE; + if( ((head>>10)&0x3) == 0x3 ) + return FALSE; + return TRUE; +} +#endif + + +/* + * the code a header and write the information + * into the frame structure + */ +int decode_header(struct frame *fr,unsigned long newhead) +{ + if( newhead & (1<<20) ) { + fr->lsf = (newhead & (1<<19)) ? 0x0 : 0x1; + fr->mpeg25 = 0; + } + else { + fr->lsf = 1; + fr->mpeg25 = 1; + } + + fr->lay = 4-((newhead>>17)&3); + if( ((newhead>>10)&0x3) == 0x3) { + ast_log(LOG_WARNING,"Stream error\n"); + return (0); + } + if(fr->mpeg25) { + fr->sampling_frequency = 6 + ((newhead>>10)&0x3); + } + else + fr->sampling_frequency = ((newhead>>10)&0x3) + (fr->lsf*3); + fr->error_protection = ((newhead>>16)&0x1)^0x1; + + if(fr->mpeg25) /* allow Bitrate change for 2.5 ... */ + fr->bitrate_index = ((newhead>>12)&0xf); + + fr->bitrate_index = ((newhead>>12)&0xf); + fr->padding = ((newhead>>9)&0x1); + fr->extension = ((newhead>>8)&0x1); + fr->mode = ((newhead>>6)&0x3); + fr->mode_ext = ((newhead>>4)&0x3); + fr->copyright = ((newhead>>3)&0x1); + fr->original = ((newhead>>2)&0x1); + fr->emphasis = newhead & 0x3; + + fr->stereo = (fr->mode == MPG_MD_MONO) ? 1 : 2; + + if(!fr->bitrate_index) + { + ast_log(LOG_WARNING,"Free format not supported.\n"); + return (0); + } + + switch(fr->lay) + { + case 1: +#if 0 + fr->do_layer = do_layer1; + fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? + (fr->mode_ext<<2)+4 : 32; + fr->framesize = (long) tabsel_123[fr->lsf][0][fr->bitrate_index] * 12000; + fr->framesize /= freqs[fr->sampling_frequency]; + fr->framesize = ((fr->framesize+fr->padding)<<2)-4; +#else + ast_log(LOG_WARNING,"Layer 1 not supported!\n"); +#endif + break; + case 2: +#if 0 + fr->do_layer = do_layer2; + get_II_stuff(fr); + fr->jsbound = (fr->mode == MPG_MD_JOINT_STEREO) ? + (fr->mode_ext<<2)+4 : fr->II_sblimit; + fr->framesize = (long) tabsel_123[fr->lsf][1][fr->bitrate_index] * 144000; + fr->framesize /= freqs[fr->sampling_frequency]; + fr->framesize += fr->padding - 4; +#else + ast_log(LOG_WARNING,"Layer 2 not supported!\n"); +#endif + break; + case 3: +#if 0 + fr->do_layer = do_layer3; + if(fr->lsf) + ssize = (fr->stereo == 1) ? 9 : 17; + else + ssize = (fr->stereo == 1) ? 17 : 32; +#endif + +#if 0 + if(fr->error_protection) + ssize += 2; +#endif + fr->framesize = (long) tabsel_123[fr->lsf][2][fr->bitrate_index] * 144000; + fr->framesize /= freqs[fr->sampling_frequency]<<(fr->lsf); + fr->framesize = fr->framesize + fr->padding - 4; + break; + default: + ast_log(LOG_WARNING,"Sorry, unknown layer type.\n"); + return (0); + } + return 1; +} + +#if 0 +void print_header(struct frame *fr) +{ + static char *modes[4] = { "Stereo", "Joint-Stereo", "Dual-Channel", "Single-Channel" }; + static char *layers[4] = { "Unknown" , "I", "II", "III" }; + + ast_log(LOG_WARNING,"MPEG %s, Layer: %s, Freq: %ld, mode: %s, modext: %d, BPF : %d\n", + fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"), + layers[fr->lay],freqs[fr->sampling_frequency], + modes[fr->mode],fr->mode_ext,fr->framesize+4); + ast_log(LOG_WARNING,"Channels: %d, copyright: %s, original: %s, CRC: %s, emphasis: %d.\n", + fr->stereo,fr->copyright?"Yes":"No", + fr->original?"Yes":"No",fr->error_protection?"Yes":"No", + fr->emphasis); + ast_log(LOG_WARNING,"Bitrate: %d Kbits/s, Extension value: %d\n", + tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index],fr->extension); +} + +void print_header_compact(struct frame *fr) +{ + static char *modes[4] = { "stereo", "joint-stereo", "dual-channel", "mono" }; + static char *layers[4] = { "Unknown" , "I", "II", "III" }; + + ast_log(LOG_WARNING,"MPEG %s layer %s, %d kbit/s, %ld Hz %s\n", + fr->mpeg25 ? "2.5" : (fr->lsf ? "2.0" : "1.0"), + layers[fr->lay], + tabsel_123[fr->lsf][fr->lay-1][fr->bitrate_index], + freqs[fr->sampling_frequency], modes[fr->mode]); +} + +#endif + +unsigned int getbits(struct mpstr *mp, int number_of_bits) +{ + unsigned long rval; + + if(!number_of_bits) + return 0; + + { + rval = (mp->worksample).wordpointer[0]; + rval <<= 8; + rval |= (mp->worksample).wordpointer[1]; + rval <<= 8; + rval |= (mp->worksample).wordpointer[2]; + rval <<= (mp->worksample).bitindex; + rval &= 0xffffff; + + (mp->worksample).bitindex += number_of_bits; + + rval >>= (24-number_of_bits); + + (mp->worksample).wordpointer += ((mp->worksample).bitindex>>3); + (mp->worksample).bitindex &= 7; + } + return rval; +} + +unsigned int getbits_fast(struct mpstr *mp, int number_of_bits) +{ + unsigned long rval; + + { + rval = (mp->worksample).wordpointer[0]; + rval <<= 8; + rval |= (mp->worksample).wordpointer[1]; + rval <<= (mp->worksample).bitindex; + rval &= 0xffff; + (mp->worksample).bitindex += number_of_bits; + + rval >>= (16-number_of_bits); + + (mp->worksample).wordpointer += ((mp->worksample).bitindex>>3); + (mp->worksample).bitindex &= 7; + } + return rval; +} + +unsigned int get1bit(struct mpstr *mp) +{ + unsigned char rval; + + rval = *((mp->worksample).wordpointer) << (mp->worksample).bitindex; + + (mp->worksample).bitindex++; + (mp->worksample).wordpointer += ((mp->worksample).bitindex>>3); + (mp->worksample).bitindex &= 7; + + return rval>>7; +} + + + |