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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | 203 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | CC=cc 2 | target=adts_example 3 | $(target):main.o adts.o 4 | $(CC) -o $(target) main.o adts.o 5 | 6 | main.o:main.c adts.h 7 | $(CC) -c main.c 8 | adts.o:adts.c adts.h 9 | $(CC) -c adts.c 10 | 11 | .PHONY: clean 12 | clean: 13 | rm $(target) main.o adts.o 14 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | #ADTS 2 | ##什么是ADTS 3 | ADTS全称是(Audio Data Transport Stream)，是AAC的一种十分常见的传输格式。 4 | 一般的AAC解码器都需要把AAC的ES流打包成ADTS的格式，一般是在AAC ES流前添加7个字节的ADTS header。也就是说你可以吧ADTS这个头看作是AAC的frameheader。 5 | ##ADTS内容及结构 6 | ADTS 头中相对有用的信息 采样率、声道数、帧长度。 7 | 一般情况下ADTS的头信息都是7个字节，分为2部分： 8 | ### 1 固定部分 9 | 10 | ``` 11 | typedef struct adts_fixed_header { 12 | unsigned short syncword: 12; 13 | unsigned char id: 1; 14 | unsigned char layer: 2; 15 | unsigned char protection_absent: 1; 16 | unsigned char profile: 2; 17 | unsigned char sampling_frequency_index: 4; 18 | unsigned char private_bit: 1; 19 | unsigned char channel_configuration: 3; 20 | unsigned char original_copy: 1; 21 | unsigned char home: 1; 22 | } adts_fixed_header; // length : 28 bits 23 | ``` 24 | 25 | ### 2 可变部分 26 | ``` 27 | typedef struct adts_variable_header { 28 | unsigned char copyright_identification_bit: 1; 29 | unsigned char copyright_identification_start: 1; 30 | unsigned short aac_frame_length: 13; 31 | unsigned short adts_buffer_fullness: 11; 32 | unsigned char number_of_raw_data_blocks_in_frame:2; 33 | } adts_variable_header; // length : 28 bits 34 | ``` 35 | ## 如何使用? 36 | 直接将adts.h & adts.c这两个文件加入到工程中即可编译. 37 | -------------------------------------------------------------------------------- /adts.c: -------------------------------------------------------------------------------- 1 | // 2 | // adts.c 3 | // AdtsTest 4 | // 5 | // Created by zg.shao on 15/4/9. 6 | // Copyright (c) 2015年 shaozg.cn. All rights reserved. 7 | // 8 | 9 | #include "adts.h" 10 | #include 11 | 12 | void set_fixed_header(adts_fixed_header *header) { 13 | header->syncword = 0xFF;// 代表着一个帧的开始 14 | header->id = 0;// MPEG Version: 0 for MPEG-4, 1 for MPEG-2 15 | header->layer = 0;// always 00 16 | header->protection_absent = 1;// 表示是否误码校验 17 | header->profile = 1;// 表示使用哪个级别的AAC, 有些芯片只支持AAC LC. 18 | header->sampling_frequency_index = 4;// 表示使用的采样率的下标 19 | header->private_bit = 0; 20 | header->channel_configuration = 2;// 表示声道数 21 | header->original_copy = 0; 22 | header->home = 0; 23 | } 24 | 25 | void set_variable_header(adts_variable_header *header, const int aac_raw_data_length) { 26 | header->copyright_identification_bit = 0; 27 | header->copyright_identification_start = 0; 28 | header->aac_frame_length = aac_raw_data_length + 7; 29 | header->adts_buffer_fullness = 0x7f; 30 | header->number_of_raw_data_blocks_in_frame = 2; 31 | } 32 | 33 | void get_fixed_header(const unsigned char buff[7], adts_fixed_header *header) { 34 | unsigned long long adts = 0; 35 | const unsigned char *p = buff; 36 | adts |= *p ++; adts <<= 8; 37 | adts |= *p ++; adts <<= 8; 38 | adts |= *p ++; adts <<= 8; 39 | adts |= *p ++; adts <<= 8; 40 | adts |= *p ++; adts <<= 8; 41 | adts |= *p ++; adts <<= 8; 42 | adts |= *p ++; 43 | 44 | 45 | header->syncword = (adts >> 44); 46 | header->id = (adts >> 43) & 0x01; 47 | header->layer = (adts >> 41) & 0x03; 48 | header->protection_absent = (adts >> 40) & 0x01; 49 | header->profile = (adts >> 38) & 0x03; 50 | header->sampling_frequency_index = (adts >> 34) & 0x0f; 51 | header->private_bit = (adts >> 33) & 0x01; 52 | header->channel_configuration = (adts >> 30) & 0x07; 53 | header->original_copy = (adts >> 29) & 0x01; 54 | header->home = (adts >> 28) & 0x01; 55 | } 56 | 57 | void get_variable_header(const unsigned char buff[7], adts_variable_header *header) { 58 | unsigned long long adts = 0; 59 | adts = buff[0]; adts <<= 8; 60 | adts |= buff[1]; adts <<= 8; 61 | adts |= buff[2]; adts <<= 8; 62 | adts |= buff[3]; adts <<= 8; 63 | adts |= buff[4]; adts <<= 8; 64 | adts |= buff[5]; adts <<= 8; 65 | adts |= buff[6]; 66 | 67 | header->copyright_identification_bit = (adts >> 27) & 0x01; 68 | header->copyright_identification_start = (adts >> 26) & 0x01; 69 | header->aac_frame_length = (adts >> 13) & ((int)pow(2, 14) - 1); 70 | header->adts_buffer_fullness = (adts >> 2) & ((int)pow(2, 11) - 1); 71 | header->number_of_raw_data_blocks_in_frame = adts & 0x03; 72 | } 73 | 74 | void convert_adts_header2int64(const adts_fixed_header *fixed_header, const adts_variable_header *variable_header, uint64_t *header) { 75 | uint64_t ret_value = 0; 76 | ret_value = fixed_header->syncword; 77 | ret_value <<= 1; 78 | ret_value |= fixed_header->id; 79 | ret_value <<= 2; 80 | ret_value |= fixed_header->layer; 81 | ret_value <<= 1; 82 | ret_value |= (fixed_header->protection_absent) & 0x01; 83 | ret_value <<= 2; 84 | ret_value |= fixed_header->profile; 85 | ret_value <<= 4; 86 | ret_value |= (fixed_header->sampling_frequency_index) & 0x0f; 87 | ret_value <<= 1; 88 | ret_value |= (fixed_header->private_bit) & 0x01; 89 | ret_value <<= 3; 90 | ret_value |= (fixed_header->channel_configuration) & 0x07; 91 | ret_value <<= 1; 92 | ret_value |= (fixed_header->original_copy) & 0x01; 93 | ret_value <<= 1; 94 | ret_value |= (fixed_header->home) & 0x01; 95 | 96 | ret_value <<= 1; 97 | ret_value |= (variable_header->copyright_identification_bit) & 0x01; 98 | ret_value <<= 1; 99 | ret_value |= (variable_header->copyright_identification_start) & 0x01; 100 | ret_value <<= 13; 101 | ret_value |= (variable_header->aac_frame_length) & ((int)pow(2, 13) - 1); 102 | ret_value <<= 11; 103 | ret_value |= (variable_header->adts_buffer_fullness) & ((int)pow(2, 11) - 1); 104 | ret_value <<= 2; 105 | ret_value |= (variable_header->number_of_raw_data_blocks_in_frame) & ((int)pow(2, 2) - 1); 106 | 107 | *header = ret_value; 108 | } 109 | 110 | void convert_adts_header2char(const adts_fixed_header *fixed_header, const adts_variable_header *variable_header, unsigned char buffer[7]) { 111 | uint64_t value = 0; 112 | convert_adts_header2int64(fixed_header, variable_header, &value); 113 | 114 | buffer[0] = (value >> 48) & 0xff; 115 | buffer[1] = (value >> 40) & 0xff; 116 | buffer[2] = (value >> 32) & 0xff; 117 | buffer[3] = (value >> 24) & 0xff; 118 | buffer[4] = (value >> 16) & 0xff; 119 | buffer[5] = (value >> 8) & 0xff; 120 | buffer[6] = (value) & 0xff; 121 | } 122 | -------------------------------------------------------------------------------- /adts.h: -------------------------------------------------------------------------------- 1 | // 2 | // adts.h 3 | // AdtsTest 4 | // 5 | // Created by zg.shao on 15/4/9. 6 | // Copyright (c) 2015年 shaozg.cn. All rights reserved. 7 | // 8 | 9 | #ifndef __AdtsHeader__adts__ 10 | #define __AdtsHeader__adts__ 11 | 12 | #include 13 | #include 14 | 15 | /* 16 | * ADTS 全称: Audio Data Transport Stream. 是 AAC音频的传输流格式. 17 | * ADTS头中相对有用的信息包括: 采样率, 声道数, 帧长度. 每一个带ADTS头信息的AAC流都会清晰的告诉解码器他需要的这些信息. 18 | * 一般情况下ADTS的头信息都是7个字节, 分为两部分: 前28bit是 adts_fixed_header, 后28bit是 adts_variable_header. 19 | */ 20 | 21 | typedef struct adts_fixed_header { 22 | unsigned short syncword: 12; 23 | unsigned char id: 1; 24 | unsigned char layer: 2; 25 | unsigned char protection_absent: 1; 26 | unsigned char profile: 2; 27 | unsigned char sampling_frequency_index: 4; 28 | unsigned char private_bit: 1; 29 | unsigned char channel_configuration: 3; 30 | unsigned char original_copy: 1; 31 | unsigned char home: 1; 32 | } adts_fixed_header; // length : 28 bits 33 | 34 | typedef struct adts_variable_header { 35 | unsigned char copyright_identification_bit: 1; 36 | unsigned char copyright_identification_start: 1; 37 | unsigned short aac_frame_length: 13; 38 | unsigned short adts_buffer_fullness: 11; 39 | unsigned char number_of_raw_data_blocks_in_frame:2; 40 | } adts_variable_header; // length : 28 bits 41 | 42 | // 设置adts固定的一部分 43 | extern void set_fixed_header(adts_fixed_header *header); 44 | 45 | // 设置adts可变的一部分 46 | extern void set_variable_header(adts_variable_header *header, const int aac_raw_data_length); 47 | 48 | 49 | // 解析buff中的adts固定部分头信息 50 | extern void get_fixed_header(const unsigned char buff[7], adts_fixed_header *header); 51 | 52 | // 解析buff中的adts可变部分头信息 53 | extern void get_variable_header(const unsigned char buff[7], adts_variable_header *header); 54 | 55 | 56 | // 将adts头信息转化为一个64位的整数, PS: 前面8位空着 57 | extern void convert_adts_header2int64(const adts_fixed_header *fixed_header, const adts_variable_header *variable_header, uint64_t *header); 58 | 59 | // 将adts头信息转化为一个7字节的buff 60 | extern void convert_adts_header2char(const adts_fixed_header *fixed_header, const adts_variable_header *variable_header, unsigned char buffer[7]); 61 | 62 | #endif /* defined(__AdtsHeader__adts__) */ 63 | -------------------------------------------------------------------------------- /main.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include "adts.h" 7 | 8 | 9 | #define BUFFER_SIZE (100) 10 | 11 | static void print_binary(u_int64_t value) { 12 | int index = 0; 13 | int binary_count = sizeof(u_int64_t) * 8; 14 | while (binary_count-- > 0) { 15 | u_int64_t tmp = value >> binary_count; 16 | if ((tmp & 0x01) == 1) { 17 | printf("1"); 18 | } else { 19 | printf("0"); 20 | } 21 | 22 | if (++index % 8 == 0) { 23 | printf(" "); 24 | } 25 | } 26 | 27 | printf("==> %lld \n", value); 28 | } 29 | 30 | static void print_fixed_header(const adts_fixed_header *header) { 31 | printf("---- ADTS fixed header details: ----\n"); 32 | printf("syncword:%02X\n", header->syncword); 33 | printf("id:%d\n", header->id); 34 | printf("layer:%d\n", header->layer); 35 | printf("protection_absent:%d\n", header->protection_absent); 36 | printf("profile:%d\n", header->profile); 37 | printf("sampling_frequency_index:%d\n", header->sampling_frequency_index); 38 | printf("private_bit:%d\n", header->private_bit); 39 | printf("channel_configuration:%d\n", header->channel_configuration); 40 | printf("original_copy:%d\n", header->original_copy); 41 | printf("home:%d\n", header->home); 42 | printf("------------------------------------------\n"); 43 | } 44 | 45 | static void print_variable_header(const adts_variable_header *header) { 46 | printf("---- ADTS variable header details: ----\n"); 47 | printf("copyright_identification_bit:%d\n", header->copyright_identification_bit); 48 | printf("copyright_identification_start:%d\n", header->copyright_identification_start); 49 | printf("aac_frame_length:%d\n", header->aac_frame_length); 50 | printf("adts_buffer_fullness:%d\n", header->adts_buffer_fullness); 51 | printf("number_of_raw_data_blocks_in_frame:%d\n", header->number_of_raw_data_blocks_in_frame); 52 | printf("------------------------------------------\n"); 53 | } 54 | 55 | int main(int argc, char **argv) { 56 | adts_fixed_header fixed_header; 57 | adts_variable_header variable_header; 58 | 59 | memset(&fixed_header, 0, sizeof(adts_fixed_header)); 60 | memset(&variable_header, 0, sizeof(adts_variable_header)); 61 | 62 | char *buffer = (char *)malloc(BUFFER_SIZE + 7); 63 | 64 | unsigned char adts[7]; 65 | // 1 组装 buffer 66 | set_fixed_header(&fixed_header); 67 | set_variable_header(&variable_header, BUFFER_SIZE); 68 | 69 | convert_adts_header2char(&fixed_header, &variable_header, adts); 70 | 71 | memcpy(&buffer[0], adts, 7); 72 | 73 | // 2 打印组装的buffer头7个字节 74 | print_fixed_header(&fixed_header); 75 | print_variable_header(&variable_header); 76 | 77 | // 3 拆解 buffer 78 | unsigned char headerBuff[7]; 79 | memcpy(headerBuff, buffer, 7); 80 | memset(&fixed_header, 0, sizeof(adts_fixed_header)); 81 | memset(&variable_header, 0, sizeof(adts_variable_header)); 82 | get_fixed_header(headerBuff, &fixed_header); 83 | get_variable_header(headerBuff, &variable_header); 84 | 85 | // 4 打印拆解后的结构体 86 | print_fixed_header(&fixed_header); 87 | print_variable_header(&variable_header); 88 | free(buffer); 89 | 90 | return 0; 91 | } --------------------------------------------------------------------------------