diff options
Diffstat (limited to 'libtoolame-dab/common.c')
| -rw-r--r-- | libtoolame-dab/common.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libtoolame-dab/common.c b/libtoolame-dab/common.c new file mode 100644 index 0000000..e1c5407 --- /dev/null +++ b/libtoolame-dab/common.c @@ -0,0 +1,188 @@ + +/*********************************************************************** +* +* Global Include Files +* +***********************************************************************/ +#include <stdio.h> +#include <string.h> /* 1995-07-11 shn */ +#include <ctype.h> +#include <stdlib.h> +#include "common.h" +#include "options.h" +#include "encode_new.h" +#include "tables.h" + +/*********************************************************************** +* +* Global Variable Definitions +* +***********************************************************************/ + +char *mode_names[4] = { "stereo", "j-stereo", "dual-ch", "single-ch" }; +char *version_names[2] = { "MPEG-2 LSF", "MPEG-1" }; + +/* 1: MPEG-1, 0: MPEG-2 LSF, 1995-07-11 shn */ +double s_freq[2][4] = { {22.05, 24, 16, 0}, {44.1, 48, 32, 0} }; + +/* 1: MPEG-1, 0: MPEG-2 LSF, 1995-07-11 shn */ +int bitrate[2][15] = { + {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}, + {0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384} +}; + +double multiple[64] = { + 2.00000000000000, 1.58740105196820, 1.25992104989487, + 1.00000000000000, 0.79370052598410, 0.62996052494744, 0.50000000000000, + 0.39685026299205, 0.31498026247372, 0.25000000000000, 0.19842513149602, + 0.15749013123686, 0.12500000000000, 0.09921256574801, 0.07874506561843, + 0.06250000000000, 0.04960628287401, 0.03937253280921, 0.03125000000000, + 0.02480314143700, 0.01968626640461, 0.01562500000000, 0.01240157071850, + 0.00984313320230, 0.00781250000000, 0.00620078535925, 0.00492156660115, + 0.00390625000000, 0.00310039267963, 0.00246078330058, 0.00195312500000, + 0.00155019633981, 0.00123039165029, 0.00097656250000, 0.00077509816991, + 0.00061519582514, 0.00048828125000, 0.00038754908495, 0.00030759791257, + 0.00024414062500, 0.00019377454248, 0.00015379895629, 0.00012207031250, + 0.00009688727124, 0.00007689947814, 0.00006103515625, 0.00004844363562, + 0.00003844973907, 0.00003051757813, 0.00002422181781, 0.00001922486954, + 0.00001525878906, 0.00001211090890, 0.00000961243477, 0.00000762939453, + 0.00000605545445, 0.00000480621738, 0.00000381469727, 0.00000302772723, + 0.00000240310869, 0.00000190734863, 0.00000151386361, 0.00000120155435, + 1E-20 +}; + +enum byte_order NativeByteOrder = order_unknown; + +/*********************************************************************** +* +* Global Function Definitions +* +***********************************************************************/ + + + +int js_bound (int m_ext) +{ + /* layer 2 only */ + static int jsb_table[4] = { 4, 8, 12, 16 }; + + if (m_ext < 0 || m_ext > 3) { + fprintf (stderr, "js_bound bad modext (%d)\n", m_ext); + exit (1); + } + return (jsb_table[m_ext]); +} + +void hdr_to_frps (frame_info * frame) +/* interpret data in hdr str to fields in frame */ +{ + frame_header *hdr = frame->header; /* (or pass in as arg?) */ + + frame->actual_mode = hdr->mode; + frame->nch = (hdr->mode == MPG_MD_MONO) ? 1 : 2; + + frame->sblimit = pick_table (frame); + /* MFC FIX this up */ + encode_init(frame); + + if (hdr->mode == MPG_MD_JOINT_STEREO) + frame->jsbound = js_bound (hdr->mode_ext); + else + frame->jsbound = frame->sblimit; + /* alloc, tab_num set in pick_table */ +} + +int BitrateIndex (int bRate, /* legal rates from 32 to 448 */ + int version /* MPEG-1 or MPEG-2 LSF */ ) +/* convert bitrate in kbps to index */ +{ + int index = 0; + int found = 0; + + while (!found && index < 15) { + if (bitrate[version][index] == bRate) + found = 1; + else + ++index; + } + if (found) + return (index); + else { + fprintf (stderr, + "BitrateIndex: %d is not a legal bitrate for version %i\n", + bRate, version); + exit (-1); /* Error! */ + } +} + +int SmpFrqIndex (long sRate, int *version) +/* convert samp frq in Hz to index */ +/* legal rates 16000, 22050, 24000, 32000, 44100, 48000 */ +{ + if (sRate == 44100L) { + *version = MPEG_AUDIO_ID; + return (0); + } else if (sRate == 48000L) { + *version = MPEG_AUDIO_ID; + return (1); + } else if (sRate == 32000L) { + *version = MPEG_AUDIO_ID; + return (2); + } else if (sRate == 24000L) { + *version = MPEG_PHASE2_LSF; + return (1); + } else if (sRate == 22050L) { + *version = MPEG_PHASE2_LSF; + return (0); + } else if (sRate == 16000L) { + *version = MPEG_PHASE2_LSF; + return (2); + } else { + fprintf (stderr, "SmpFrqIndex: %ld is not a legal sample rate\n", sRate); + return (-1); /* Error! */ + } +} + + + + + +/******************************************************************** +new_ext() +Puts a new extension name on a file name <filename>. +Removes the last extension name, if any. +1992-08-19, 1995-06-12 shn +***********************************************************************/ +void new_ext (char *filename, char *extname, char *newname) +{ + int found, dotpos; + + /* First, strip the extension */ + dotpos = strlen (filename); + found = 0; + do { + switch (filename[dotpos]) { + case '.': + found = 1; + break; + case '\\': + case '/': + case ':': + found = -1; + break; + default: + dotpos--; + if (dotpos < 0) + found = -1; + break; + } + } + while (found == 0); + if (found == -1) + strcpy (newname, filename); + if (found == 1) { + strncpy (newname, filename, dotpos); + newname[dotpos] = '\0'; + } + strcat (newname, extname); +} |