From cc2160de5cc05dc3aa77f3a34358e66f6193c8c9 Mon Sep 17 00:00:00 2001 From: Michał Cichoń Date: Tue, 26 Jun 2012 20:35:30 +0200 Subject: Add support for AAC. --- faad2/src/plugins/QCDMp4/aacinfo.c | 224 +++++++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 faad2/src/plugins/QCDMp4/aacinfo.c (limited to 'faad2/src/plugins/QCDMp4/aacinfo.c') diff --git a/faad2/src/plugins/QCDMp4/aacinfo.c b/faad2/src/plugins/QCDMp4/aacinfo.c new file mode 100644 index 0000000..fb689d6 --- /dev/null +++ b/faad2/src/plugins/QCDMp4/aacinfo.c @@ -0,0 +1,224 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com +** +** This program is free software; you can redistribute it and/or modify +** it under the terms of the GNU General Public License as published by +** the Free Software Foundation; either version 2 of the License, or +** (at your option) any later version. +** +** This program is distributed in the hope that it will be useful, +** but WITHOUT ANY WARRANTY; without even the implied warranty of +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +** GNU General Public License for more details. +** +** You should have received a copy of the GNU General Public License +** along with this program; if not, write to the Free Software +** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +** +** Any non-GPL usage of this software or parts of this software is strictly +** forbidden. +** +** Commercial non-GPL licensing of this software is possible. +** For more info contact Ahead Software through Mpeg4AAClicense@nero.com. +** +** $Id: aacinfo.c,v 1.3 2003/12/06 04:24:17 rjamorim Exp $ +**/ + +#define WIN32_LEAN_AND_MEAN +#include +#include +#include +#include +#include "aacinfo.h" +#include "utils.h" + +#define ADIF_MAX_SIZE 30 /* Should be enough */ +#define ADTS_MAX_SIZE 10 /* Should be enough */ + +static int sample_rates[] = {96000,88200,64000,48000,44100,32000,24000,22050,16000,12000,11025,8000}; + +static int read_ADIF_header(FILE *file, faadAACInfo *info) +{ + int bitstream; + unsigned char buffer[ADIF_MAX_SIZE]; + int skip_size = 0; + int sf_idx; + + /* Get ADIF header data */ + info->headertype = 1; + + if (fread(buffer, 1, ADIF_MAX_SIZE, file) != ADIF_MAX_SIZE) + return -1; + + /* copyright string */ + if(buffer[0] & 0x80) + skip_size += 9; /* skip 9 bytes */ + + bitstream = buffer[0 + skip_size] & 0x10; + info->bitrate = ((unsigned int)(buffer[0 + skip_size] & 0x0F)<<19)| + ((unsigned int)buffer[1 + skip_size]<<11)| + ((unsigned int)buffer[2 + skip_size]<<3)| + ((unsigned int)buffer[3 + skip_size] & 0xE0); + + if (bitstream == 0) + { + info->object_type = ((buffer[6 + skip_size]&0x01)<<1)|((buffer[7 + skip_size]&0x80)>>7); + sf_idx = (buffer[7 + skip_size]&0x78)>>3; + } else { + info->object_type = (buffer[4 + skip_size] & 0x18)>>3; + sf_idx = ((buffer[4 + skip_size] & 0x07)<<1)|((buffer[5 + skip_size] & 0x80)>>7); + } + info->sampling_rate = sample_rates[sf_idx]; + + return 0; +} + +static int read_ADTS_header(FILE *file, faadAACInfo *info) +{ + /* Get ADTS header data */ + unsigned char buffer[ADTS_MAX_SIZE]; + int frames, t_framelength = 0, frame_length, sr_idx = 0, ID; + int second = 0, pos; + float frames_per_sec = 0; + unsigned long bytes; + unsigned long *tmp_seek_table = NULL; + + info->headertype = 2; + + /* Read all frames to ensure correct time and bitrate */ + for (frames = 0; /* */; frames++) + { + bytes = fread(buffer, 1, ADTS_MAX_SIZE, file); + + if (bytes != ADTS_MAX_SIZE) + break; + + /* check syncword */ + if (!((buffer[0] == 0xFF)&&((buffer[1] & 0xF6) == 0xF0))) + break; + + if (!frames) + { + /* fixed ADTS header is the same for every frame, so we read it only once */ + /* Syncword found, proceed to read in the fixed ADTS header */ + ID = buffer[1] & 0x08; + info->object_type = (buffer[2]&0xC0)>>6; + sr_idx = (buffer[2]&0x3C)>>2; + info->channels = ((buffer[2]&0x01)<<2)|((buffer[3]&0xC0)>>6); + + frames_per_sec = sample_rates[sr_idx] / 1024.f; + } + + /* ...and the variable ADTS header */ + if (ID == 0) + { + info->version = 4; + } else { /* MPEG-2 */ + info->version = 2; + } + frame_length = ((((unsigned int)buffer[3] & 0x3)) << 11) + | (((unsigned int)buffer[4]) << 3) | (buffer[5] >> 5); + + t_framelength += frame_length; + + pos = ftell(file) - ADTS_MAX_SIZE; + + fseek(file, frame_length - ADTS_MAX_SIZE, SEEK_CUR); + } + + if (frames > 0) + { + float sec_per_frame, bytes_per_frame; + info->sampling_rate = sample_rates[sr_idx]; + sec_per_frame = (float)info->sampling_rate/1024.0; + bytes_per_frame = (float)t_framelength / (float)frames; + info->bitrate = 8 * (int)floor(bytes_per_frame * sec_per_frame); + info->length = (int)floor((float)frames/frames_per_sec)*1000; + } else { + info->sampling_rate = 4; + info->bitrate = 128000; + info->length = 0; + info->channels = 0; + } + + return 0; +} + +int get_AAC_format(char *filename, faadAACInfo *info) +{ + unsigned long tagsize; + FILE *file; + char buffer[10]; + unsigned long file_len; + unsigned char adxx_id[5]; + unsigned long tmp; + + memset(info, 0, sizeof(faadAACInfo)); + + file = fopen(filename, "rb"); + + if(file == NULL) + return -1; + + fseek(file, 0, SEEK_END); + file_len = ftell(file); + fseek(file, 0, SEEK_SET); + + /* Skip the tag, if it's there */ + tmp = fread(buffer, 10, 1, file); + + if (StringComp(buffer, "ID3", 3) == 0) + { + /* high bit is not used */ + tagsize = (buffer[6] << 21) | (buffer[7] << 14) | + (buffer[8] << 7) | (buffer[9] << 0); + + fseek(file, tagsize, SEEK_CUR); + tagsize += 10; + } else { + tagsize = 0; + fseek(file, 0, SEEK_SET); + } + + if (file_len) + file_len -= tagsize; + + tmp = fread(adxx_id, 2, 1, file); + adxx_id[5-1] = 0; + info->length = 0; + + /* Determine the header type of the file, check the first two bytes */ + if (StringComp(adxx_id, "AD", 2) == 0) + { + /* We think its an ADIF header, but check the rest just to make sure */ + tmp = fread(adxx_id + 2, 2, 1, file); + + if (StringComp(adxx_id, "ADIF", 4) == 0) + { + read_ADIF_header(file, info); + + info->length = (int)((float)file_len*8000.0/((float)info->bitrate)); + } + } else { + /* No ADIF, check for ADTS header */ + if ((adxx_id[0] == 0xFF)&&((adxx_id[1] & 0xF6) == 0xF0)) + { + /* ADTS header located */ + fseek(file, tagsize, SEEK_SET); + read_ADTS_header(file, info); + } else { + /* Unknown/headerless AAC file, assume format: */ + info->version = 2; + info->bitrate = 128000; + info->sampling_rate = 44100; + info->channels = 2; + info->headertype = 0; + info->object_type = 1; + } + } + + fclose(file); + + return 0; +} -- cgit v1.2.3