142 lines
5.2 KiB
C
142 lines
5.2 KiB
C
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#ifndef __AVI_H
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#define __AVI_H
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#include "typesdef.h"
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#include "stream_frame.h"
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typedef struct {
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uint32_t dwFourCC; // 必须为'avih'
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uint32_t dwSize; // 本数据结构的大小，不包括最初的8个字节(dwFourCC和dwSize两个字段)
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uint32_t dwMicroSecPerFrame; // 每帧的持续时间(以毫秒ms为单位)，定义avi的显示速率
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uint32_t dwMaxBytesPerSec; // 最大的数据传输率
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uint32_t dwPaddingGranularity; // 数据填充的粒度
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uint32_t dwFlages; // AVI文件的特殊属性，如是否包含索引块，音视频数据是否交叉存储
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uint32_t dwTotalFrame; // 文件中的总帧数
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uint32_t dwInitialFrames; // 说明在开始播放前需要多少桢
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uint32_t dwStreams; // 文件中包含的数据流个数
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uint32_t dwSuggestedBufferSize; // 建议使用的缓冲区的大小，
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// 通常为存储一桢图像以及同步声音所需要的数据之和
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uint32_t dwWidth; // 图像宽
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uint32_t dwHeight; // 图像高
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uint32_t dwReserved[4]; // 保留值
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} AVIMainHeader;
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typedef struct {
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uint32_t fccType; // 4字节，表示数据流的种类，vids表示视频数据流，auds表示音频数据流
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uint32_t fccHandler; // 4字节 ，表示数据流解压缩的驱动程序代号
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uint32_t dwFlags; // 数据流属性
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uint16_t wPriority; // 此数据流的播放优先级
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uint16_t wLanguage; // 音频的语言代号
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uint32_t dwInitalFrames; // 说明在开始播放前需要多少桢
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uint32_t dwScale; // 数据量，视频每桢的大小或者音频的采样大小
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uint32_t dwRate; // dwScale/dwRate = 每秒的采样数
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uint32_t dwStart; // 数据流开始播放的位置，以dwScale为单位
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uint32_t dwLength; // 数据流的数据量，以dwScale为单位
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uint32_t dwSuggestedBufferSize; // 建议缓冲区的大小
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uint32_t dwQuality; // 解压缩质量参数，值越大，质量越好
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uint32_t dwSampleSize; // 音频的采样大小
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uint16_t rcFrame[4]; // 视频图像所占的矩形
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}AVIStreamHeader;
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//实际标准后面可能还有信息,这里就不解析了
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typedef struct tWAVEFORMATEX {
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uint16_t wFormatTag;
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uint16_t nChannels;
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uint32_t nSamplesPerSec;
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uint32_t nAvgBytesPerSec;
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uint16_t nBlockAlign;
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uint16_t wBitsPerSample;
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uint16_t cbSize;
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} WAVEFORMATEX;
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struct avi_list
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{
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uint32_t offset;
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uint32_t size;
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};
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typedef struct avi_list avi_list_audio_s;
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typedef struct avi_list avi_list_photo_s;
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struct idx1_s
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{
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uint32_t dwChunkId;
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uint32_t dwFlags;
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uint32_t dwOffset;
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uint32_t dwSize;
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};
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//快速索引表
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struct fast_index_list
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{
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struct fast_index_list *next;
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struct fast_index_list *prev;
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uint32_t avi_index; //当前视频index的值,这个记录的是视频的帧数
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uint32_t audio_index; //当前音频index,这个记录的是音频的长度
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uint32_t offset; //当前的偏移值,读取的第一个index就是对应avi或者index
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};
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struct avi_msg_s
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{
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AVIMainHeader avi;
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void *fp;
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uint32_t fps;
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uint32_t sample;
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uint32_t movi_addr;
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uint32_t idx1_addr;
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uint32_t idx1_size;
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struct avi_read_msg_s *avi_read_msg;
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struct fast_index_list *fast_index;
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//当前读取视频帧的buf
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uint32_t video_buf[512/4]; //当前读取视频帧的索引的缓冲区
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uint32_t video_file_addr; //当前读取视频帧的地址
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int32_t video_frame_num; //视频帧数
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uint32_t video_not_read_size; //剩余长度
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int32_t video_cache_remain; //缓存剩余长度
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struct idx1_s *video_idx1;
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//当前读取音频帧的buf
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uint32_t audio_buf[512/4]; //当前读取音频帧的索引的缓冲区
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uint32_t audio_file_addr; //当前读取音频帧的地址
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int32_t audio_frame_num; //音频的读取偏移长度
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uint32_t audio_not_read_size; //剩余长度
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int32_t audio_cache_remain; //缓存剩余长度
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struct idx1_s *audio_idx1;
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uint8_t offset;
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uint32_t v_id,a_id;
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};
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struct chunk_s
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{
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uint32_t dwFourCC;
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uint32_t size;
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};
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struct avi_read_msg_s
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{
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uint32_t addr_offset;
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uint32_t avi_index;
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uint32_t audio_index;
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uint32_t remain_read_size;
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uint32_t buf[512/4];
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};
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void *avi_read_init(const char *filename);
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void parse_idx1(char *buf,uint32_t size);
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void avi_deinit(struct avi_msg_s *avi_msg);
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struct avi_read_msg_s *read_msg_init(struct avi_msg_s *avi_msg);
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void gen_fast_index_list(struct avi_msg_s *avi_msg);
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void read_msg_deinit(struct avi_msg_s *avi_msg);
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void locate_avi_index(struct avi_msg_s *avi_msg,uint32_t index);
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void avi_read_next_index(struct avi_msg_s *avi_msg,uint32_t *offset,uint32_t *size,uint32_t *frame_num);
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void avi_read_next_audio_index(struct avi_msg_s *avi_msg,uint32_t *offset,uint32_t *size,uint32_t *frame_num);
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#endif
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