ref: 37da9bcec4e98d7bbc29407e534ac4c857d4ddb4
dir: /common/mp4ff/mp4util.c/
/* ** 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 [email protected]. ** ** $Id: mp4util.c,v 1.16 2004/03/27 11:14:49 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; }