134 lines
5.6 KiB
C
134 lines
5.6 KiB
C
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#ifndef _AVI_DEFINE_H_
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#define _AVI_DEFINE_H_
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#include "stdint.h"
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/**
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* reference links: https://www.cnblogs.com/songhe364826110/p/7619949.html
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* AVIFileFormat: https://web.archive.org/web/20170411001412/http://www.alexander-noe.com/video/documentation/avi.pdf
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* OpenDML AVI File Format Extensions: https://web.archive.org/web/20070112225112/http://www.the-labs.com/Video/odmlff2-avidef.pdf
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*/
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typedef struct
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{
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uint32_t FourCC;
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uint32_t size; //块大小，等于之后数据的大小
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/* 数据 uint8_t _data[size]; */
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} AVI_CHUNK_HEAD;
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typedef struct
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{
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uint32_t List; //固定为"LIST"，如果是 RIFF List 则为 "RIFF"
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uint32_t size; //块大小，等于之后数据的大小
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uint32_t FourCC;
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/* 数据 uint8_t _data[size-4]; */
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} AVI_LIST_HEAD;
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typedef struct
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{
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uint32_t FourCC; //块ID，固定为avih
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uint32_t size; //块大小，等于struct avi_avih_chunk去掉id和size的大小
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uint32_t us_per_frame; //视频帧间隔时间(以微秒为单位)
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uint32_t max_bytes_per_sec; //AVI文件的最大数据率
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uint32_t padding; //设为0即可
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uint32_t flags; //AVI文件全局属性，如是否含有索引块、音视频数据是否交叉存储等
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uint32_t total_frames; //总帧数
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uint32_t init_frames; //为交互格式指定初始帧数(非交互格式应该指定为0)
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uint32_t streams; //文件包含的流的个数，仅有视频流时为1
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uint32_t suggest_buff_size; //指定读取本文件建议使用的缓冲区大小，通常为存储一桢图像以及同步声音所需的数据之和，不指定时设为0
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uint32_t width; //视频主窗口宽度（单位：像素）
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uint32_t height; //视频主窗口高度（单位：像素）
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uint32_t reserved[4]; //保留值dwScale,dwRate,dwStart,dwLength
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} AVI_AVIH_CHUNK;
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typedef struct
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{
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int16_t left;
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int16_t top;
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int16_t right;
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int16_t bottom;
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} AVI_RECT_FRAME;
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typedef struct
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{
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uint32_t FourCC; //块ID，固定为strh
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uint32_t size; //块大小，等于struct avi_strh_chunk去掉id和size的大小
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uint32_t fourcc_type; //流的类型，vids表示视频流，auds表示音频流
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uint32_t fourcc_codec; //指定处理这个流需要的解码器，如JPEG
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uint32_t flags; //标记，如是否允许这个流输出、调色板是否变化等，一般设为0即可
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uint16_t priority; //流的优先级，视频流设为0即可
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uint16_t language; //音频语言代号，视频流设为0即可
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uint32_t init_frames; //为交互格式指定初始帧数(非交互格式应该指定为0)
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uint32_t scale; //
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uint32_t rate; //对于视频流，rate / scale = 帧率fps
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uint32_t start; //对于视频流，设为0即可
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uint32_t length; //对于视频流，length即总帧数
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uint32_t suggest_buff_size; //读取这个流数据建议使用的缓冲区大小
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uint32_t quality; //流数据的质量指标
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uint32_t sample_size; //音频采样大小，视频流设为0即可
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AVI_RECT_FRAME rcFrame; //这个流在视频主窗口中的显示位置，设为{0,0，width,height}即可
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} AVI_STRH_CHUNK;
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/*对于视频流，strf块结构如下*/
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typedef struct
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{
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uint32_t FourCC; //块ID，固定为strf
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uint32_t size; //块大小，等于struct avi_strf_chunk去掉id和size的大小
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uint32_t size1; //size1含义和值同size一样
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uint32_t width; //视频主窗口宽度（单位：像素）
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uint32_t height; //视频主窗口高度（单位：像素）
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uint16_t planes; //始终为1
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uint16_t bitcount; //每个像素占的位数，只能是1、4、8、16、24和32中的一个
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uint32_t fourcc_compression; //视频流编码格式，如"JPEG"、"MJPG"等
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uint32_t image_size; //视频图像大小，等于width * height * bitcount / 8
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uint32_t x_pixels_per_meter; //显示设备的水平分辨率，设为0即可
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uint32_t y_pixels_per_meter; //显示设备的垂直分辨率，设为0即可
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uint32_t num_colors; //含义不清楚，设为0即可
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uint32_t imp_colors; //含义不清楚，设为0即可
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} AVI_VIDS_STRF_CHUNK;
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/*对于音频流，strf块结构如下*/
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typedef struct __attribute__((packed))
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{
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uint32_t FourCC; //块ID，固定为strf
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uint32_t size; //块大小，等于struct avi_strf_chunk去掉id和size的大小
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uint16_t format_tag;
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uint16_t channels;
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uint32_t samples_per_sec;
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uint32_t avg_bytes_per_sec;
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uint16_t block_align;
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uint32_t bits_per_sample;
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}
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AVI_AUDS_STRF_CHUNK;
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typedef struct
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{
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AVI_LIST_HEAD strl;
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AVI_STRH_CHUNK strh;
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AVI_VIDS_STRF_CHUNK strf;
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} AVI_STRL_LIST;
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typedef struct
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{
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AVI_LIST_HEAD hdrl;
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AVI_AVIH_CHUNK avih;
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AVI_STRL_LIST strl;
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} AVI_HDRL_LIST;
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typedef struct
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{
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uint32_t FourCC; //块ID，固定为 "idx1"
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uint32_t flags;
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uint32_t chunkoffset;
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uint32_t chunklength;
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} AVI_IDX1;
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/**
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"db"：未压缩的视频帧（RGB数据流）；
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"dc"：压缩的视频帧；
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"wb"：音频未压缩数据（Wave数据流）；
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"wc"：音频压缩数据（压缩的Wave数据流）；
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"pc"：改用新的调色板。（新的调色板使用一个数据结构AVIPALCHANGE来定义。如果一个流的调色板中途可能改变，则应在这个流格式的描述中，也就是AVISTREAMHEADER结构的dwFlags中包含一个AVISF_VIDEO_PALCHANGES标记。）
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*/
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#endif
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