diff options
Diffstat (limited to 'faad2/src/common/faad/aacinfo.c')
| -rw-r--r-- | faad2/src/common/faad/aacinfo.c | 372 |
1 files changed, 0 insertions, 372 deletions
diff --git a/faad2/src/common/faad/aacinfo.c b/faad2/src/common/faad/aacinfo.c deleted file mode 100644 index 1cfbab2..0000000 --- a/faad2/src/common/faad/aacinfo.c +++ /dev/null @@ -1,372 +0,0 @@ -/*
-** 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 1.4 2003/07/29 08:20:11 menno Exp $
-**/
-
-#ifdef _WIN32
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#endif
-#include <malloc.h>
-#include "filestream.h"
-#include "aacinfo.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_STREAM *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(read_buffer_filestream(file, buffer, ADIF_MAX_SIZE) < 0)
- 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_STREAM *file, faadAACInfo *info,
- unsigned long **seek_table, int *seek_table_len,
- int tagsize, int no_seek_table)
-{
- /* Get ADTS header data */
- unsigned char buffer[ADTS_MAX_SIZE];
- int frames, framesinsec=0, t_framelength = 0, frame_length, sr_idx, ID;
- int second = 0, pos;
- int i;
- 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++, framesinsec++)
- {
- /* If streaming, only go until we hit 5 seconds worth */
- if(file->http)
- {
- if(frames >= 43 * 5)
- {
- break;
- }
- }
-
- pos = tell_filestream(file);
-
- /* 12 bit SYNCWORD */
- bytes = read_buffer_filestream(file, buffer, ADTS_MAX_SIZE);
-
- if(bytes != ADTS_MAX_SIZE)
- {
- /* Bail out if no syncword found */
- 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;
-
- if(!file->http)
- {
- if(framesinsec == 43)
- framesinsec = 0;
-
- if(framesinsec == 0 && seek_table_len)
- {
- tmp_seek_table = (unsigned long *) realloc(tmp_seek_table, (second + 1) * sizeof(unsigned long));
- tmp_seek_table[second] = pos;
- }
- if(framesinsec == 0)
- second++;
- }
-
- /* NOTE: While simply skipping ahead by reading may seem to be more work than seeking,
- it is actually much faster, and keeps compatibility with streaming */
- for(i=0; i < frame_length - ADTS_MAX_SIZE; i++)
- {
- if(read_byte_filestream(file) < 0)
- break;
- }
- }
-
- if(seek_table_len)
- {
- *seek_table_len = second;
- *seek_table = tmp_seek_table;
- }
-
- info->sampling_rate = sample_rates[sr_idx];
- info->bitrate = (int)(((t_framelength / frames) * (info->sampling_rate/1024.0)) +0.5)*8;
-
- if(file->http)
- {
- /* Since we only use 5 seconds of aac data to get a rough bitrate, we must use a different
- method of calculating the overall length */
- if(filelength_filestream(file))
- {
- info->length = (int)((filelength_filestream(file)/(((info->bitrate*8)/1024)*16))*1000);
- }
- else
- {
- /* Since the server didnt tell us how long the file is,
- we have no way of determining length */
- info->length = 0;
- }
- }
- else
- {
- info->length = (int)((float)(frames/frames_per_sec))*1000;
- }
-
- return 0;
-}
-
-int get_AAC_format(char *filename, faadAACInfo *info,
- unsigned long **seek_table, int *seek_table_len,
- int no_seek_table)
-{
- unsigned long tagsize;
- FILE_STREAM *file;
- char buffer[10];
- unsigned long file_len;
- unsigned char adxx_id[5];
- unsigned long tmp;
-
- memset(info, 0, sizeof(faadAACInfo));
-
- file = open_filestream(filename);
-
- if(file == NULL)
- return -1;
-
- file_len = filelength_filestream(file);
-
- /* Skip the tag, if it's there */
- tmp = read_buffer_filestream(file, buffer, 10);
-
- if (StringComp(buffer, "ID3", 3) == 0)
- {
- unsigned int i;
-
- /* high bit is not used */
- tagsize = (buffer[6] << 21) | (buffer[7] << 14) |
- (buffer[8] << 7) | (buffer[9] << 0);
-
- for(i=0; i < tagsize; i++)
- if(read_byte_filestream(file) < 0)
- return -1;
-
- tagsize += 10;
- }
- else
- {
- tagsize = 0;
-
- /* Simple hack to reset to the beginning */
- file->buffer_offset = 0;
- file->file_offset = 0;
- }
-
- if(file_len)
- file_len -= tagsize;
-
- tmp = read_buffer_filestream(file, adxx_id, 2);
- //seek_filestream(file, tagsize, FILE_BEGIN);
-
- 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 = read_buffer_filestream(file, adxx_id + 2, 2);
-
- if(StringComp(adxx_id, "ADIF", 4) == 0)
- {
- read_ADIF_header(file, info);
- }
- }
- else
- {
- /* No ADIF, check for ADTS header */
- if ((adxx_id[0] == 0xFF)&&((adxx_id[1] & 0xF6) == 0xF0))
- {
- /* ADTS header located */
- /* Since this routine must work for streams, we can't use the seek function to go backwards, thus
- we have to use a quick hack as seen below to go back where we need to. */
-
- if(file->buffer_offset >= 2)
- {
- // simple seeking hack, though not really safe, the probability of it causing a problem is low.
- file->buffer_offset -= 2;
- file->file_offset -= 2;
- }
-
- read_ADTS_header(file, info, seek_table, seek_table_len, tagsize,
- no_seek_table);
- }
- 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;
- }
- }
-
- close_filestream(file);
-
- return 0;
-}
-
-int StringComp(char const *str1, char const *str2, unsigned long len)
-{
- signed int c1 = 0, c2 = 0;
-
- while (len--) {
- c1 = *str1++;
- c2 = *str2++;
-
- if (c1 == 0 || c1 != c2)
- break;
- }
-
- return c1 - c2;
-}
-
-#ifdef TEST
-/* Program to test aacinfo functionality */
-
-#include <stdio.h>
-
-void main(int argc, char *argv[])
-{
- faadAACInfo info;
- unsigned long *seek_table = NULL;
- int seek_table_len = 0;
- char *header, *object;
-
- if (argc < 2)
- {
- fprintf(stderr, "USAGE: aacinfo aacfile.aac\n");
- return;
- }
-
- get_AAC_format(argv[1], &info, &seek_table, &seek_table_len, 0);
-
- fprintf(stdout, "MPEG version: %d\n", info.version);
- fprintf(stdout, "channels: %d\n", info.channels);
- fprintf(stdout, "sampling_rate: %d\n", info.sampling_rate);
- fprintf(stdout, "bitrate: %d\n", info.bitrate);
- fprintf(stdout, "length: %.3f\n", (float)info.length/1000.0);
-
- switch (info.object_type)
- {
- case 0:
- object = "MAIN";
- break;
- case 1:
- object = "LC";
- break;
- case 2:
- object = "SSR";
- break;
- case 3:
- object = "LTP";
- break;
- }
- fprintf(stdout, "object_type: %s\n", object);
-
- switch (info.headertype)
- {
- case 0:
- header = "RAW";
- break;
- case 1:
- header = "ADIF";
- break;
- case 2:
- header = "ADTS";
- break;
- }
- fprintf(stdout, "headertype: %s\n", header);
-}
-
-#endif
\ No newline at end of file |