flv文件解析(纯c解析代码)
参考链接: 1. FLV科普12 FLV脚本数据解析-Metadata Tag解析 https://blog.csdn.net/cabbage2008/article/details/50500021
2. FLV科普9 FLV音频信息 https://blog.csdn.net/cabbage2008/article/details/50445023
3. FLV科普6 FLV Tag以及Tag头信息解析 https://blog.csdn.net/cabbage2008/article/details/50374083
4. FLV科普11 FLV视频信息 https://blog.csdn.net/cabbage2008/article/details/50449857
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h> #define TAB44 " "
#define PRINTF_DEBUG #define MAX_SIGNATURE_LEN 3
#define MAX_PRE_TAG_SIZE_LEN 4
#define MIN_FLV_HEADER_LEN 9
#define MAX_TAG_HEADER_LEN 11
#define MAX_PARSE_TAG_NUM 15
#define MAX_AMF_STR_SIZE 255 /************************************************************************************************************
** flv header: 记录了flv的类型, 版本等信息, 是flv的开头, 一般都差不多, 占9bytes
**
-------------------------------------------------------------------------------------------------------------
** 字段名称 | 长度(bytes) | 有关描述
-------------------------------------------------------------------------------------------------------------
** signature | 3 | 文件标识, 总是为"FLV", 0x46 0x4c 0x56
** version | 1 | 版本(目前为0x01)
** flag | 3 | 文件的标志位说明. 前5位保留, 必须为0;
第6位为音频Tag: 1表示有音频; 第七位保留, 为0; 第8位为视频Tag: 1表示有视频
** headersize | 4 | 整个header的长度, 一般为9(版本为0x01时); 大于9表示下面还有扩展信息
************************************************************************************************************/
/*
1. unsigned char reserved5: 5, flags_audio: 1, reserved1: 1, flags_video: 1;
2. unsigned char : 5, flags_audio: 1, : 1, flags_video: 1; (无名说明无法使用, 仅占位)
3. 下面结构体位域的另外两种写法.
*/
typedef struct t_flv_header
{
unsigned char signature[MAX_SIGNATURE_LEN+];
unsigned char version;
unsigned char : ;
unsigned char flags_audio: ;
unsigned char : ;
unsigned char flags_video: ; int headersize;
} T_FLV_HEADER; /************************************************************************************************************
** tag header
**
-------------------------------------------------------------------------------------------------------------
** 字段名称 | 长度(bytes) | 有关描述
-------------------------------------------------------------------------------------------------------------
** type | 1 | 数据类型, (0x12)为脚本类型; (0x08)为音频类型; (0x09）为视频类型
** data_size | 3 | 数据区长度
** timestamp | 3 | 时间戳, 类型为(0x12)的tag时间戳一直为0, (0xFFFFFF)可以表示长度为4小时, 单位为毫秒.
** timestamp_extended | 1 | 将时间戳扩展为4bytes, 代表高8位, 一般都为0, 长度为4小时的flv一般很少见了
** streamid | 3 | 总为0
************************************************************************************************************/
typedef struct t_flv_tag_header
{
int type;
int data_size;
int timestamp;
int timestamp_extended;
int streamid;
} T_FLV_TAG_HEADER; /************************************************************************************************************
** video tag header
**
-------------------------------------------------------------------------------------------------------------
** 字段名称 | 长度(bytes) | 有关描述
-------------------------------------------------------------------------------------------------------------
** FreameType | 4(bits) | FrameType为数据类型, 1为关键帧, 2为非关键帧, 3为h263的非关键帧,
4为服务器生成关键帧, 5为视频信息或命令帧.
** CodecId | 4(bits) | CodecID为包装类型, 1为JPEG, 2为H263, 3为Screen video,
4为On2 VP6, 5为On2 VP6, 6为Screen videoversion 2, 7为AVC CodecID=2, 为H263VideoPacket;
CodecID=3, 为ScreenVideopacket;
CodecID=4, 为VP6FLVVideoPacket;
CodecID=5, 为VP6FLVAlphaVideoPacket;
CodecID=6, 为ScreenV2VideoPacket;
CodecID=7, 为AVCVideoPacket. ** AVCVideoPacket Format: | AVCPacketType(8)| CompostionTime(24) | Data |
如果AVCPacketType=0x00, 为AVCSequence Header;--描述了SPS以及PPS的信息;
如果AVCPacketType=0x01, 为AVC NALU;
如果AVCPacketType=0x02, 为AVC end ofsequence;
CompositionTime为相对时间戳: 如果AVCPacketType=0x01, 为相对时间戳; 其它, 均为0; Data为负载数据:
如果AVCPacketType=0x00, 为AVCDecorderConfigurationRecord;
如果AVCPacketType=0x01, 为NALUs;
如果AVCPacketType=0x02, 为空. AVCDecorderConfigurationRecord格式, 包括文件的信息:
| cfgVersion(8) | avcProfile(8) | profileCompatibility(8) |avcLevel(8) | reserved(6) | lengthSizeMinusOne(2) | reserved(3) | numOfSPS(5) |spsLength(16) | sps(n) | numOfPPS(8) | ppsLength(16) | pps(n) |
************************************************************************************************************/
typedef struct t_flv_tag_video_header
{
unsigned char freameType:, codecId:;
} T_FLV_TAG_VIDEO_HEADER; /************************************************************************************************************
** AVCDecoderConfigurationRecord
**
-------------------------------------------------------------------------------------------------------------
** 字段名称 | 长度(bytes) | 有关描述
-------------------------------------------------------------------------------------------------------------
** configurationVersion | 1 | 配置版本占用8位, 一定为1
** AVCProfileIndication | 1 | profile_idc占用8位, 从H.264标准SPS第一个字段profile_idc拷贝而来, 指明所用profile
** profile_compatibility | 1 | 占用8位, 从H.264标准SPS拷贝的冗余字
** AVCLevelIndication | 1 | level_idc占用8位, 从H.264标准SPS第一个字段level_idc拷贝而来, 指明所用 level
** reserved | 6b | 保留位占6位, 值一定为'111111'
** lengthSizeMinusOne | 2b | 占用2位, 表示NAL单元头的长度, 0表示1字节, 1表示2字节, 2表示3字节, 3表示4字节
** reserved | 3b | 保留位占3位, 值一定为'111'
** numOfSPS | 5b | numOfSequenceParameterSets占用5位, 表示当前SPS的个数
** SPSLength | 2 | sequenceParameterSetLength占用16位, SPS占用的长度
** SPSData | * |
** numOfPPS | 5b | numOfPictureParameterSets占用8位, 表示当前PPS的个数
** PPSLength | 2 | pictureParameterSetLength占用16位, PPS占用的长度
** PPSData | * | numOfPictureParameterSets占用8位, 表示当前PPS的个数 AVCProfileIndication, profile_compatibility, AVCLevelIndication就是拷贝SPS的前3个字节
************************************************************************************************************/
typedef struct t_flv_tag_avc_dec_cfg
{
unsigned char configurationVersion;
unsigned char AVCProfileIndication;
unsigned char profile_compatibility;
unsigned char AVCLevelIndication;
unsigned char :, lengthSizeMinusOne:; unsigned char :, numOfSequenceParameterSets:;
unsigned short spsLen;
unsigned char *spsData; unsigned char numOfPictureParameterSets;
unsigned short ppsLen;
unsigned char *ppsData;
} T_FLV_TAG_AVC_DEC_CFG; /************************************************************************************************************
** avc video packet header
**
-------------------------------------------------------------------------------------------------------------
** 字段名称 | 长度(bytes) | 有关描述
-------------------------------------------------------------------------------------------------------------
** AVCPacketType占用1字节 | 1 |
** CompositionTime | 3 | AVCVideoPacket同样包括Packet Header和Packet Body两部分：
Packet Header:
AVCPacketType占用1字节, 仅在AVC时有此字段
0, AVC sequence header (SPS、PPS信息等)
1, AVC NALU
2, AVC end of sequence (lower level NALU sequence ender is not required or supported) CompositionTime占用24位, 相对时间戳, 如果AVCPacketType=0x01为相对时间戳; 其它, 均为0;
该值表示当前帧的显示时间, tag的时间为解码时间, 显示时间等于 解码时间+CompositionTime.
************************************************************************************************************/
typedef struct t_flv_tag_avc_video_packet
{
unsigned char avcPacketType; int compositionTime; union videoPacket
{
T_FLV_TAG_AVC_DEC_CFG avcDecCfg;
} vp;
} T_FLV_TAG_AVC_VIDEO_PACKET; typedef struct t_flv_tag_audio_header
{
unsigned char soundFormat:, soundRate:, soundSize:, soundType:;
} T_FLV_TAG_AUDIO_HEADER; typedef struct t_flv_tag_aac_spec_cfg
{
unsigned char audioObjectType:;
unsigned char samplingFreqIndex:, channelCfg:;
} T_FLV_TAG_AAC_SPEC_CFG; typedef struct t_flv_tag_aac_audio_packet
{
unsigned char aacPacketType; union audioPacket
{
T_FLV_TAG_AAC_SPEC_CFG aacSpecCfg;
} ap;
} T_FLV_TAG_AAC_AUDIO_PACKET; typedef struct t_flv_tag
{
} T_FLV_TAG; /* 小端转double */
static double dealAmfNumber(unsigned char *amfNum)
{
double d = ; unsigned char *dp = (unsigned char *)&d; dp[] = amfNum[];
dp[] = amfNum[];
dp[] = amfNum[];
dp[] = amfNum[];
dp[] = amfNum[];
dp[] = amfNum[];
dp[] = amfNum[];
dp[] = amfNum[]; return d;
} /*
1. DealHeader(const unsigned char* headerData);
这样定义会报warning: assignment discards 'const' qualifier from pointer target type,
大意是指针丢掉"const"限定符.
2. 原因是: data = headerData; 这一句存在丢掉的风险(可通过给*data赋予不同的值, 使得headerData的数据也被修改, 失去const的作用)
3. const int *p; //这种情况表示*p是const无法进行修改, 而p是可以进行修改的;
int* const p; //这种情况表示p是const无法进行修改, 而*p是可以进行修改的;
const int* const p; //这种情况表示*p与p都无法进行修改.
*/
static void DealFlvHeader(unsigned char* const headerData)
{
unsigned char *data = NULL; T_FLV_HEADER flvHeader = {}; data = headerData; memset(&flvHeader, 0x0, sizeof(T_FLV_HEADER)); memcpy(flvHeader.signature, data, MAX_SIGNATURE_LEN); flvHeader.signature[MAX_SIGNATURE_LEN] = '\0'; data += MAX_SIGNATURE_LEN; flvHeader.version = data[]; data += ; flvHeader.flags_audio = data[] >> & 0x1;
flvHeader.flags_video = data[] & 0x1; data += ; flvHeader.headersize = (data[] << ) | (data[] << ) | (data[] << ) | data[]; if (0x1 != flvHeader.version)
{
printf("version is not 1, todo...\n");
} #ifdef PRINTF_DEBUG
printf("+FLV Header\n");
printf("%ssignature: %s, version: %d, flags_audio: %d, flags_video: %d, headersize: %d\n",
TAB44, flvHeader.signature, flvHeader.version, flvHeader.flags_audio, flvHeader.flags_video, flvHeader.headersize);
#endif
} static void DealTagHeader(unsigned char* const headerData, T_FLV_TAG_HEADER *tagHeader)
{
static int videoTagNum = ;
static int audioTagNum = ; unsigned char *data = NULL; T_FLV_TAG_HEADER header = {}; data = headerData; memset(&header, 0x0, sizeof(T_FLV_TAG_HEADER)); header.type = data[]; data += ; header.data_size = (data[] << ) | (data[] << ) | data[]; data += ; header.timestamp = (data[] << ) | (data[] << ) | data[]; data += ; header.timestamp_extended = data[]; data += ; header.streamid = (data[] << ) | (data[] << ) | data[]; memcpy(tagHeader, &header, sizeof(T_FLV_TAG_HEADER)); #ifdef PRINTF_DEBUG
switch (tagHeader->type)
{
case 0x12:
printf("%s+Script Tag\n", TAB44); break; case 0x9:
videoTagNum++; printf("%s+Video Tag[%d]\n", TAB44, videoTagNum); break; case 0x8:
audioTagNum++; printf("%s+Audio Tag[%d]\n", TAB44, audioTagNum); break; default:
break;
} printf("%s%s+Tag Header\n", TAB44, TAB44);
printf("%s%s%stype: %d, data_size: %d, timestamp: %d, timestamp_extended: %d, streamid: %d\n",
TAB44, TAB44, TAB44, tagHeader->type, tagHeader->data_size, tagHeader->timestamp, tagHeader->timestamp_extended, tagHeader->streamid);
#endif
} /*
第一个AMF包：
第1个字节表示AMF包类型, 一般总是0x02, 表示字符串, 其他值表示意义请查阅文档.
第2-3个字节为UI16类型值, 表示字符串的长度, 一般总是0x000A("onMetaData"长度).
后面字节为字符串数据, 一般总为"onMetaData".
第二个AMF包：
第1个字节表示AMF包类型, 一般总是0x08, 表示数组.
第2-5个字节为UI32类型值, 表示数组元素的个数.
后面即为各数组元素的封装, 数组元素为元素名称和值组成的对. 表示方法如下:
第1-2个字节表示元素名称的长度, 假设为L. 后面跟着为长度为L的字符串. 第L+3个字节表示元素值的类型.
后面跟着为对应值, 占用字节数取决于值的类型. 0 = Number type (double, 8)
1 = Boolean type
2 = String type
3 = Object type
4 = MovieClip type
5 = Null type
6 = Undefined type
7 = Reference type
8 = ECMA array type
10 = Strict array type
11 = Date type
12 = Long string type 1. 不要频繁的malloc小内存(内存碎片, 代价);
2. 如该函数中arrayKey, arrayValue, amfStrData设置成指针, 然后malloc就有问题(字符串后残留上述三个最大长度中的字符);
3. 可能的解释: 当用free释放的你用malloc分配的存储空间, 释放的存储空间并没有从进程的地址空间中删除, 而是保留在可用存储区池中,
当再次用malloc时只要可用存储区池中有足够的地址空间, 都不会再向内可申请内存了, 而是在可用存储区池中分配了. 实际分析时: 8的数组后还有一串 00 00 09, 暂时不清楚, 先跳过if (tagDataSize <= 3)
*/
static void DealScriptTagData(unsigned char* const tagData, unsigned int tagDataSize)
{
int i = ;
int amfType = ;
int amfIndex = ;
int valueType = ;
int valueSize = ;
int keySize = ;
int arrayCount = ;
int amfStringSize = ; double amfNum = ; unsigned char amfStr[MAX_AMF_STR_SIZE+] = {}; unsigned char *data = NULL; data = tagData; for (;;)
{
if (tagDataSize <= )
{
break;
} amfType = data[]; amfIndex += ; data += ;
tagDataSize -= ; #ifdef PRINTF_DEBUG
printf("%s%s%sAMF%d type: %d\n", TAB44, TAB44, TAB44, amfIndex, amfType);
#endif switch (amfType)
{
case :
amfStringSize = (data[] << ) | data[]; #ifdef PRINTF_DEBUG
printf("%s%s%sAMF%d String size: %d\n", TAB44, TAB44, TAB44, amfIndex, amfStringSize);
#endif data += ;
tagDataSize -= ; memset(amfStr, 0x0, sizeof(amfStr)); memcpy(amfStr, data, amfStringSize); amfStr[amfStringSize] = '\0'; #ifdef PRINTF_DEBUG
printf("%s%s%sAMF%d String: %s\n", TAB44, TAB44, TAB44, amfIndex, amfStr);
#endif data += amfStringSize;
tagDataSize -= amfStringSize; break; case :
arrayCount = (data[] << ) | (data[] << ) | (data[] << ) | data[]; #ifdef PRINTF_DEBUG
printf("%s%s%sAMF%d Metadata count: %d\n", TAB44, TAB44, TAB44, amfIndex, arrayCount);
printf("%s%s%s+Metadata\n", TAB44, TAB44, TAB44);
#endif data += ;
tagDataSize -= ; for (i=; i<arrayCount; i++)
{
keySize = (data[] << ) | data[]; data += ;
tagDataSize -= ; memset(amfStr, 0x0, sizeof(amfStr)); memcpy(amfStr, data, keySize); amfStr[keySize] = '\0'; #ifdef PRINTF_DEBUG
printf("%s%s%s%s%s: ", TAB44, TAB44, TAB44, TAB44, amfStr);
#endif data += keySize;
tagDataSize -= keySize; valueType = data[]; data += ;
tagDataSize -= ; if ( == valueType)
{
amfNum = dealAmfNumber(data);
#ifdef PRINTF_DEBUG
printf("%lf\n", amfNum);
#endif data += ;
tagDataSize -= ;
}
else if ( == valueType)
{
#ifdef PRINTF_DEBUG
printf("%d\n", data[]);
#endif
data += ;
tagDataSize -= ;
}
else if ( == valueType)
{
valueSize = (data[] << ) | data[]; data += ;
tagDataSize -= ; memset(amfStr, 0x0, sizeof(amfStr)); memcpy(amfStr, data, valueSize); amfStr[valueSize] = '\0'; #ifdef PRINTF_DEBUG
printf("%s\n", amfStr);
#endif data += valueSize;
tagDataSize -= valueSize;
}
else
{
//printf("now can not parse value type: %d\n", valueType); return;
}
} break; default:
break;
}
}
} /*
Video Header = | FrameType(4) | CodecID(4) |
VideoData = | FrameType(4) | CodecID(4) | VideoData(n) |
*/
static void DealVideoTagData(unsigned char* const tagData)
{
unsigned char *data = NULL; data = tagData; T_FLV_TAG_VIDEO_HEADER vTagHeader = {};
T_FLV_TAG_AVC_VIDEO_PACKET avcVideoPacket = {}; memset(&vTagHeader, 0x0, sizeof(vTagHeader)); vTagHeader.freameType = data[] >> & 0xf;
vTagHeader.codecId = data[] & 0xf; data++; #ifdef PRINTF_DEBUG
printf("%s%s%sFrameType: %d\n", TAB44, TAB44, TAB44, vTagHeader.freameType);
printf("%s%s%sCodecId: %d\n", TAB44, TAB44, TAB44, vTagHeader.codecId);
#endif /* now just avc(h264) */
switch (vTagHeader.codecId)
{
case 0x07:
memset(&avcVideoPacket, 0x0, sizeof(avcVideoPacket)); avcVideoPacket.avcPacketType = data[];
avcVideoPacket.compositionTime = (data[] << ) | (data[] << ) | data[]; data += ; if ( == avcVideoPacket.avcPacketType)
{
#ifdef PRINTF_DEBUG
printf("%s%s%s+AVCVideoPacket\n", TAB44, TAB44, TAB44);
printf("%s%s%s%sAVCPacketType: %d\n", TAB44, TAB44, TAB44, TAB44, avcVideoPacket.avcPacketType);
printf("%s%s%s%sCompositionTime Offset: %d\n", TAB44, TAB44, TAB44, TAB44, avcVideoPacket.compositionTime);
#endif
printf("%s%s%s%s+AVCDecoderConfigurationRecord\n", TAB44, TAB44, TAB44, TAB44); avcVideoPacket.vp.avcDecCfg.configurationVersion = data[];
avcVideoPacket.vp.avcDecCfg.AVCProfileIndication = data[];
avcVideoPacket.vp.avcDecCfg.profile_compatibility = data[];
avcVideoPacket.vp.avcDecCfg.AVCLevelIndication = data[];
avcVideoPacket.vp.avcDecCfg.lengthSizeMinusOne = data[] & 0x3;
avcVideoPacket.vp.avcDecCfg.numOfSequenceParameterSets = data[] & 0x1f;
avcVideoPacket.vp.avcDecCfg.spsLen = (data[] << ) | data[]; // todo, parse sps data += (+avcVideoPacket.vp.avcDecCfg.spsLen); avcVideoPacket.vp.avcDecCfg.numOfPictureParameterSets = data[];
avcVideoPacket.vp.avcDecCfg.ppsLen = (data[] << ) | data[]; // todo, parse pps #ifdef PRINTF_DEBUG
printf("%s%s%s%s%sconfigurationVersion: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.configurationVersion);
printf("%s%s%s%s%sAVCProfileIndication: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.AVCProfileIndication);
printf("%s%s%s%s%sprofile_compatibility: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.profile_compatibility);
printf("%s%s%s%s%sAVCLevelIndication: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.AVCLevelIndication);
printf("%s%s%s%s%slengthSizeMinusOne: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.lengthSizeMinusOne);
printf("%s%s%s%s%snumOfSequenceParameterSets: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.numOfSequenceParameterSets);
printf("%s%s%s%s%ssequenceParameterSetLength: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.spsLen);
printf("%s%s%s%s%snumOfPictureParameterSets: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.numOfPictureParameterSets);
printf("%s%s%s%s%spictureParameterSetLength: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, avcVideoPacket.vp.avcDecCfg.ppsLen);
#endif
}
else
{
#ifdef PRINTF_DEBUG
printf("%s%s%s+Video Data\n", TAB44, TAB44, TAB44);
printf("%s%s%s%sAVCPacketType: %d\n", TAB44, TAB44, TAB44, TAB44, avcVideoPacket.avcPacketType);
printf("%s%s%s%sCompositionTime Offset: %d\n", TAB44, TAB44, TAB44, TAB44, avcVideoPacket.compositionTime);
printf("%s%s%s%sData\n", TAB44, TAB44, TAB44, TAB44);
#endif
} break; default:
break;
}
} static void DealAudioTagData(unsigned char* const tagData)
{
unsigned char *data = NULL; data = tagData; T_FLV_TAG_AUDIO_HEADER audioHeader = {};
T_FLV_TAG_AAC_AUDIO_PACKET aPacket = {}; memset(&audioHeader, 0x0, sizeof(T_FLV_TAG_AUDIO_HEADER)); audioHeader.soundFormat = (data[] >> ) & 0xf;
audioHeader.soundRate = (data[] >> ) & 0x3;
audioHeader.soundSize = (data[] >> ) & 0x1;
audioHeader.soundType = data[] & 0x1; #ifdef PRINTF_DEBUG
printf("%s%s%sSoundFormat: %d\n", TAB44, TAB44, TAB44, audioHeader.soundFormat); switch (audioHeader.soundRate)
{
case :
printf("%s%s%sSoundRate: 5.5-KHz\n", TAB44, TAB44, TAB44);
break; case :
printf("%s%s%sSoundRate: 11-KHz\n", TAB44, TAB44, TAB44);
break; case :
printf("%s%s%sSoundRate: 22-KHz\n", TAB44, TAB44, TAB44);
break; case :
printf("%s%s%sSoundRate: 44-KHz\n", TAB44, TAB44, TAB44);
break; default:
printf("%s%s%sSoundRate: %d\n", TAB44, TAB44, TAB44, audioHeader.soundRate);
} switch (audioHeader.soundSize)
{
case :
printf("%s%s%sSoundSize: snd8bit\n", TAB44, TAB44, TAB44);
break; case :
printf("%s%s%sSoundSize: snd16bit\n", TAB44, TAB44, TAB44);
break; default:
printf("%s%s%sSoundSize: %d\n", TAB44, TAB44, TAB44, audioHeader.soundSize);
} switch (audioHeader.soundType)
{
case :
printf("%s%s%sSoundType: sndMono\n", TAB44, TAB44, TAB44);
break; case :
printf("%s%s%sSoundType: sndStereo\n", TAB44, TAB44, TAB44);
break; default:
printf("%s%s%sSoundSize: %d\n", TAB44, TAB44, TAB44, audioHeader.soundSize);
}
#endif data++; /* now just for aac */
switch (audioHeader.soundFormat)
{
case 0xa:
memset(&aPacket, 0x0, sizeof(T_FLV_TAG_AAC_AUDIO_PACKET)); aPacket.aacPacketType = data[]; if ( == aPacket.aacPacketType)
{
#ifdef PRINTF_DEBUG
printf("%s%s%s+AACAudioData\n", TAB44, TAB44, TAB44);
printf("%s%s%s%sAACPacketType: %d\n", TAB44, TAB44, TAB44, TAB44, aPacket.aacPacketType);
#endif
aPacket.ap.aacSpecCfg.audioObjectType = (data[] >> ) & 0x1f;
aPacket.ap.aacSpecCfg.samplingFreqIndex = ((data[] & 0x7) << ) | ((data[] >> ) & 0x1);
aPacket.ap.aacSpecCfg.channelCfg = (data[] >> ) & 0xf; #ifdef PRINTF_DEBUG
printf("%s%s%s%s+AudioSpecificConfig\n", TAB44, TAB44, TAB44, TAB44); printf("%s%s%s%s%sAudioObjectType: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, aPacket.ap.aacSpecCfg.audioObjectType);
printf("%s%s%s%s%sSamplingFrequencyIndex: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, aPacket.ap.aacSpecCfg.samplingFreqIndex);
printf("%s%s%s%s%sChannelConfiguration: %d\n", TAB44, TAB44, TAB44, TAB44, TAB44, aPacket.ap.aacSpecCfg.channelCfg);
#endif
}
else
{
#ifdef PRINTF_DEBUG
printf("%s%s%s+AACAudioData\n", TAB44, TAB44, TAB44);
printf("%s%s%s%sAACPacketType: %d\n", TAB44, TAB44, TAB44, TAB44, aPacket.aacPacketType);
printf("%s%s%s%sData(Raw AAC frame data)\n", TAB44, TAB44, TAB44, TAB44);
#endif
} break; default:
break;
}
} static void DealTagData(unsigned char* const tagData, const int tagType, const unsigned int tagSize)
{
#ifdef PRINTF_DEBUG
printf("%s%s%s\n", TAB44, TAB44, "+Tag Data");
#endif switch (tagType)
{
case 0x12:
DealScriptTagData(tagData, tagSize); break; case 0x9:
DealVideoTagData(tagData); break; case 0x8:
DealAudioTagData(tagData); break; default:
break;
}
} int main(int argc, char *argv[])
{
int dataLen = ;
int previousTagSize = ; FILE *fp = NULL; unsigned char *tagData = NULL; unsigned char flvHeaderData[MIN_FLV_HEADER_LEN+] = {};
unsigned char preTagSizeData[MAX_PRE_TAG_SIZE_LEN+] = {};
unsigned char tagHeaderData[MAX_TAG_HEADER_LEN+] = {}; T_FLV_TAG_HEADER tagHeader = {}; if ( != argc)
{
printf("Usage: flvparse **.flv\n"); return -;
} fp = fopen(argv[], "rb");
if (!fp)
{
printf("open file[%s] error!\n", argv[]); return -;
} memset(flvHeaderData, 0x0, sizeof(flvHeaderData)); dataLen = fread(flvHeaderData, , MIN_FLV_HEADER_LEN, fp);
if (dataLen != MIN_FLV_HEADER_LEN)
{
printf("read flv header error!\n"); fclose(fp); return -;
} flvHeaderData[MIN_FLV_HEADER_LEN] = '\0'; DealFlvHeader(flvHeaderData); #ifdef PRINTF_DEBUG
printf("+FLV Body\n");
#endif while ()
{
memset(preTagSizeData, 0x0, sizeof(preTagSizeData)); dataLen = fread(preTagSizeData, , MAX_PRE_TAG_SIZE_LEN, fp);
if (dataLen != MAX_PRE_TAG_SIZE_LEN)
{
break;
} preTagSizeData[MAX_PRE_TAG_SIZE_LEN] = '\0'; #ifdef PRINTF_DEBUG
printf("%spreviousTagSize: %d\n", TAB44, (preTagSizeData[]<<) | (preTagSizeData[]<<) | (preTagSizeData[]<<) | preTagSizeData[]);
#endif memset(tagHeaderData, 0x0, sizeof(tagHeaderData)); dataLen = fread(tagHeaderData, , MAX_TAG_HEADER_LEN, fp);
if (dataLen != MAX_TAG_HEADER_LEN)
{
continue;
} memset(&tagHeader, 0x0, sizeof(T_FLV_TAG_HEADER)); DealTagHeader(tagHeaderData, &tagHeader); tagData = (unsigned char*)malloc(tagHeader.data_size);
if (!tagData)
{
continue;
} memset(tagData, 0x0, tagHeader.data_size); dataLen = fread(tagData, , tagHeader.data_size, fp);
if (dataLen != tagHeader.data_size)
{
continue;
} DealTagData(tagData, tagHeader.type, tagHeader.data_size); free(tagData);
tagData = NULL;
} fclose(fp); return ;
}
最后如果您觉得本篇对您有帮助，可以打赏下，谢谢！！！
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