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https://gitlab.com/mbunkus/mkvtoolnix.git
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initial addition
This commit is contained in:
Moritz Bunkus
parent
991ccf886c
commit
0c16e70354
95
ac3_common.cpp
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95
ac3_common.cpp
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/*
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ogmmerge -- utility for splicing together ogg bitstreams
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from component media subtypes
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ac3common.c
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AC3 common functions
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Written by Moritz Bunkus <moritz@bunkus.org>
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Based on Xiph.org's 'oggmerge' found in their CVS repository
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See http://www.xiph.org
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Distributed under the GPL
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see the file COPYING for details
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or visit http://www.gnu.org/copyleft/gpl.html
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*/
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#include <malloc.h>
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#include <string.h>
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#include "ac3_common.h"
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int find_ac3_header(unsigned char *buf, int size, ac3_header_t *ac3_header) {
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static int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112, 128, 160,
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192, 224, 256, 320, 384, 448, 512, 576, 640};
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static unsigned char lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01,
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0x04, 0x01};
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static unsigned char halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3};
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ac3_header_t header;
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int i;
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int frmsizecod;
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int bitrate;
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int half;
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int acmod;
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for (i = 0; i < (size - 7); i++) {
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if ((buf[i] != 0x0b) || (buf[i + 1] != 0x77))
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continue;
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if (buf[i + 5] >= 0x60)
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continue;
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half = halfrate[buf[i + 5] >> 3];
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acmod = buf[i + 6] >> 5;
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header.flags = ((((buf[i + 6] & 0xf8) == 0x50) ? A52_DOLBY : acmod) |
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((buf[i + 6] & lfeon[acmod]) ? A52_LFE : 0));
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frmsizecod = buf[i + 4] & 63;
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if (frmsizecod >= 38)
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return -1;
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bitrate = rate[frmsizecod >> 1];
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header.bit_rate = (bitrate * 1000) >> half;
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switch (buf[i + 4] & 0xc0) {
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case 0:
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header.sample_rate = 48000 >> half;
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header.bytes = 4 * bitrate;
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break;
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case 0x40:
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header.sample_rate = 44100 >> half;
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header.bytes = 2 * (320 * bitrate / 147 + (frmsizecod & 1));
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break;
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case 0x80:
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header.sample_rate = 32000 >> half;
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header.bytes = 6 * bitrate;
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break;
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default:
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return -1;
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}
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switch(header.flags & A52_CHANNEL_MASK) {
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case A52_MONO:
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header.channels=1;
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break;
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case A52_CHANNEL:
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case A52_STEREO:
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case A52_CHANNEL1:
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case A52_CHANNEL2:
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case A52_DOLBY:
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header.channels=2;
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break;
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case A52_2F1R:
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case A52_3F:
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header.channels=3;
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break;
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case A52_3F1R:
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case A52_2F2R:
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header.channels=4;
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break;
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case A52_3F2R:
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header.channels=5;
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break;
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}
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if (header.flags & A52_LFE)
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header.channels++;
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memcpy(ac3_header, &header, sizeof(ac3_header_t));
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return i;
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}
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return -1;
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}
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52
ac3_common.h
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52
ac3_common.h
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@ -0,0 +1,52 @@
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/*
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ogmmerge -- utility for splicing together ogg bitstreams
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from component media subtypes
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ac3common.cpp
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AC3 header decoding functions
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Written by Moritz Bunkus <moritz@bunkus.org>
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Based on Xiph.org's 'oggmerge' found in their CVS repository
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See http://www.xiph.org
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Distributed under the GPL
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see the file COPYING for details
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or visit http://www.gnu.org/copyleft/gpl.html
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*/
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#ifndef __AC3COMMON_H
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#define __AC3COMMON_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define A52_CHANNEL 0
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#define A52_MONO 1
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#define A52_STEREO 2
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#define A52_3F 3
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#define A52_2F1R 4
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#define A52_3F1R 5
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#define A52_2F2R 6
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#define A52_3F2R 7
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#define A52_CHANNEL1 8
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#define A52_CHANNEL2 9
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#define A52_DOLBY 10
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#define A52_CHANNEL_MASK 15
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#define A52_LFE 16
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typedef struct {
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int sample_rate;
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int bit_rate;
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int channels;
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int flags;
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int bytes;
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} ac3_header_t;
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int find_ac3_header(unsigned char *buf, int size, ac3_header_t *ac3_header);
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#ifdef __cplusplus
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}
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#endif
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#endif
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97
mp3_common.cpp
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97
mp3_common.cpp
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@ -0,0 +1,97 @@
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/*
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ogmmerge -- utility for splicing together ogg bitstreams
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from component media subtypes
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mp3_common.cpp
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common routines for MP3 handling
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Written by Moritz Bunkus <moritz@bunkus.org>
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Based on Xiph.org's 'oggmerge' found in their CVS repository
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See http://www.xiph.org
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Distributed under the GPL
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see the file COPYING for details
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or visit http://www.gnu.org/copyleft/gpl.html
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*/
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#include "mp3_common.h"
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#include "common.h"
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#ifdef DMALLOC
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#include <dmalloc.h>
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#endif
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int mp3_tabsel[2][16] =
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{{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320},
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{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}};
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long mp3_freqs[9] =
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{44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000, 8000};
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int find_mp3_header(char *buf, int size, unsigned long *_header) {
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int i;
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unsigned long header;
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int pos;
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if (size < 4)
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return -1;
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for (pos = 0; pos <= (size - 4); pos++) {
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for (i = 0, header = 0; i < 4; i++) {
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header <<= 8;
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header |= (unsigned char)buf[i + pos];
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}
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if ((header == FOURCC('R', 'I', 'F', 'F')) ||
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((header & 0xffffff00) == FOURCC('I', 'D', '3', ' ')))
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continue;
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if ((header & 0xffe00000) != 0xffe00000)
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continue;
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if (!((header >> 17) & 3))
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continue;
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if (((header >> 12) & 0xf) == 0xf)
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continue;
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if (!((header >> 12) & 0xf))
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continue;
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if (((header >> 10) & 0x3) == 0x3)
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continue;
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if ((((header >> 19) & 1) == 1) && (((header >> 17) & 3) == 3) &&
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(((header >> 16) & 1) == 1))
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continue;
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if ((header & 0xffff0000) == 0xfffe0000)
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continue;
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*_header = header;
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return pos;
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}
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return -1;
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}
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void decode_mp3_header(unsigned long header, mp3_header_t *h) {
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if (header & (1 << 20)) {
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h->lsf = (header & (1 << 19)) ? 0 : 1;
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h->mpeg25 = 0;
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} else {
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h->lsf = 1;
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h->mpeg25 = 1;
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}
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h->mode = (header >> 6) & 3;
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h->error_protection = ((header >> 16) & 1) ^ 1;
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h->stereo = (h->mode == 3 ? 1 : 2);
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if (h->lsf)
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h->ssize = (h->stereo == 1 ? 9 : 17);
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else
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h->ssize = (h->stereo == 1 ? 17: 32);
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if (h->error_protection)
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h->ssize += 2;
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h->bitrate_index = (header >> 12) & 15;
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if (h->mpeg25)
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h->sampling_frequency = 6 + ((header >> 10) & 3);
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else
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h->sampling_frequency = ((header >> 10) & 3) + (h->lsf * 3);
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h->padding = (header >> 9) & 1;
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h->framesize = (long)mp3_tabsel[h->lsf][h->bitrate_index] * 144000;
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h->framesize /= (mp3_freqs[h->sampling_frequency] << h->lsf);
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h->framesize = h->framesize + h->padding - 4;
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}
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48
mp3_common.h
Normal file
48
mp3_common.h
Normal file
@ -0,0 +1,48 @@
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/*
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ogmmerge -- utility for splicing together ogg bitstreams
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from component media subtypes
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mp3_common.h
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common routines for MP3 handling
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Written by Moritz Bunkus <moritz@bunkus.org>
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Based on Xiph.org's 'oggmerge' found in their CVS repository
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See http://www.xiph.org
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Distributed under the GPL
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see the file COPYING for details
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or visit http://www.gnu.org/copyleft/gpl.html
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*/
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#ifndef __MP3_COMMON_H
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#define __MP3_COMMON_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern int mp3_tabsel[2][16];
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extern long mp3_freqs[9];
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typedef struct {
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int lsf;
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int mpeg25;
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int mode;
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int error_protection;
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int stereo;
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int ssize;
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int bitrate_index;
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int sampling_frequency;
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int padding;
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int framesize;
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} mp3_header_t;
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int find_mp3_header(char *buf, int size, unsigned long *_header);
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void decode_mp3_header(unsigned long header, mp3_header_t *h);
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#ifdef __cplusplus
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}
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#endif
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#endif
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