diff options
Diffstat (limited to 'trunk/src/mp4ff/mp4util.c')
| -rw-r--r-- | trunk/src/mp4ff/mp4util.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/trunk/src/mp4ff/mp4util.c b/trunk/src/mp4ff/mp4util.c new file mode 100644 index 000000000..1a77c97ae --- /dev/null +++ b/trunk/src/mp4ff/mp4util.c @@ -0,0 +1,188 @@ +/* +** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding +** Copyright (C) 2003-2004 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: mp4util.c,v 1.15 2004/01/11 15:52:19 menno Exp $ +**/ + +#include "mp4ffint.h" +#include <stdlib.h> + +int32_t mp4ff_read_data(mp4ff_t *f, int8_t *data, uint32_t size) +{ + int32_t result = 1; + + result = f->stream->read(f->stream->user_data, data, size); + + f->current_position += size; + + return result; +} + +int32_t mp4ff_truncate(mp4ff_t * f) +{ + return f->stream->truncate(f->stream->user_data); +} + +int32_t mp4ff_write_data(mp4ff_t *f, int8_t *data, uint32_t size) +{ + int32_t result = 1; + + result = f->stream->write(f->stream->user_data, data, size); + + f->current_position += size; + + return result; +} + +int32_t mp4ff_write_int32(mp4ff_t *f,const uint32_t data) +{ + uint32_t result; + uint32_t a, b, c, d; + int8_t temp[4]; + + *(uint32_t*)temp = data; + a = (uint8_t)temp[0]; + b = (uint8_t)temp[1]; + c = (uint8_t)temp[2]; + d = (uint8_t)temp[3]; + + result = (a<<24) | (b<<16) | (c<<8) | d; + + return mp4ff_write_data(f,(uint8_t*)&result,sizeof(result)); +} + +int32_t mp4ff_set_position(mp4ff_t *f, const int64_t position) +{ + f->stream->seek(f->stream->user_data, position); + f->current_position = position; + + return 0; +} + +int64_t mp4ff_position(const mp4ff_t *f) +{ + return f->current_position; +} + +uint64_t mp4ff_read_int64(mp4ff_t *f) +{ + uint8_t data[8]; + uint64_t result = 0; + int8_t i; + + mp4ff_read_data(f, data, 8); + + for (i = 0; i < 8; i++) + { + result |= ((uint64_t)data[i]) << ((7 - i) * 8); + } + + return result; +} + +uint32_t mp4ff_read_int32(mp4ff_t *f) +{ + uint32_t result; + uint32_t a, b, c, d; + int8_t data[4]; + + mp4ff_read_data(f, data, 4); + a = (uint8_t)data[0]; + b = (uint8_t)data[1]; + c = (uint8_t)data[2]; + d = (uint8_t)data[3]; + + result = (a<<24) | (b<<16) | (c<<8) | d; + return (uint32_t)result; +} + +uint32_t mp4ff_read_int24(mp4ff_t *f) +{ + uint32_t result; + uint32_t a, b, c; + int8_t data[4]; + + mp4ff_read_data(f, data, 3); + a = (uint8_t)data[0]; + b = (uint8_t)data[1]; + c = (uint8_t)data[2]; + + result = (a<<16) | (b<<8) | c; + return (uint32_t)result; +} + +uint16_t mp4ff_read_int16(mp4ff_t *f) +{ + uint32_t result; + uint32_t a, b; + int8_t data[2]; + + mp4ff_read_data(f, data, 2); + a = (uint8_t)data[0]; + b = (uint8_t)data[1]; + + result = (a<<8) | b; + return (uint16_t)result; +} + +char * mp4ff_read_string(mp4ff_t * f,uint32_t length) +{ + char * str = (char*)malloc(length + 1); + if (str!=0) + { + if ((uint32_t)mp4ff_read_data(f,str,length)!=length) + { + free(str); + str = 0; + } + else + { + str[length] = 0; + } + } + return str; +} + +uint8_t mp4ff_read_char(mp4ff_t *f) +{ + uint8_t output; + mp4ff_read_data(f, &output, 1); + return output; +} + +uint32_t mp4ff_read_mp4_descr_length(mp4ff_t *f) +{ + uint8_t b; + uint8_t numBytes = 0; + uint32_t length = 0; + + do + { + b = mp4ff_read_char(f); + numBytes++; + length = (length << 7) | (b & 0x7F); + } while ((b & 0x80) && numBytes < 4); + + return length; +} |