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一、avilib介绍
avilib是一个使用c语言编写的库，可以很方便的对avi文件提取帧和生成avi视频文件。如下列出avilib库的代码。
/*
* avilib.h
*
* Copyright (C) Thomas streich - June 2001
* multiple audio track support Copyright (C) 2002 Thomas streich
*
* Original code:
* Copyright (C) 1999 Rainer Johanni <[email protected]>
*
* This file is part of transcode, a linux video stream processing tool
*
* transcode 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, or (at your option)
* any later version.
*
* transcode 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef _AVI_LIB_H_
#define _AVI_LIB_H_
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <fcntl.h>
//SLM
#ifdef __CYGWIN__
#include <sys/types.h>
#elif defined WIN32
#if defined __GNUWIN32__
#include <stdint.h>
#else
#if _MSC_VER >=1700 // 1700=vs2012
#include <stdint.h>
#else
#define uint32_t unsigned __int32
#define uint8_t unsigned __int8
#define uint16_t unsigned __int16
#define uint64_t unsigned __int64
#endif
#endif
#else
#include <unistd.h>
#include <inttypes.h>
#endif
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#ifndef AVILIB_H
#define AVILIB_H
#define AVI_MAX_TRACKS 8
typedef struct
{
off_t key;
off_t pos;
off_t len;
} video_index_entry;
typedef struct
{
off_t pos;
off_t len;
off_t tot;
} audio_index_entry;
typedef struct track_s
{
long a_fmt; /* Audio format, see #defines below */
long a_chans; /* Audio channels, 0 for no audio */
long a_rate; /* Rate in Hz */
long a_bits; /* bits per audio sample */
long mp3rate; /* mp3 bitrate kbs*/
long audio_strn; /* Audio stream number */
off_t audio_bytes; /* Total number of bytes of audio data */
long audio_chunks; /* Chunks of audio data in the file */
char audio_tag[4]; /* Tag of audio data */
long audio_posc; /* Audio position: chunk */
long audio_posb; /* Audio position: byte within chunk */
off_t a_codech_off; /* absolut offset of audio codec information */
off_t a_codecf_off; /* absolut offset of audio codec information */
audio_index_entry *audio_index;
} track_t;
typedef struct
{
uint32_t bi_size;
uint32_t bi_width;
uint32_t bi_height;
uint16_t bi_planes;
uint16_t bi_bit_count;
uint32_t bi_compression;
uint32_t bi_size_image;
uint32_t bi_x_pels_per_meter;
uint32_t bi_y_pels_per_meter;
uint32_t bi_clr_used;
uint32_t bi_clr_important;
} BITMAPINFOHEADER_avilib;
typedef struct
{
uint16_t w_format_tag;
uint16_t n_channels;
uint32_t n_samples_per_sec;
uint32_t n_avg_bytes_per_sec;
uint16_t n_block_align;
uint16_t w_bits_per_sample;
uint16_t cb_size;
} WAVEFORMATEX_avilib;
typedef struct
{
uint32_t fcc_type;
uint32_t fcc_handler;
uint32_t dw_flags;
uint32_t dw_caps;
uint16_t w_priority;
uint16_t w_language;
uint32_t dw_scale;
uint32_t dw_rate;
uint32_t dw_start;
uint32_t dw_length;
uint32_t dw_initial_frames;
uint32_t dw_suggested_buffer_size;
uint32_t dw_quality;
uint32_t dw_sample_size;
uint32_t dw_left;
uint32_t dw_top;
uint32_t dw_right;
uint32_t dw_bottom;
uint32_t dw_edit_count;
uint32_t dw_format_change_count;
char sz_name[64];
} AVISTREAMINFO;
typedef struct
{
long fdes; /* File descriptor of AVI file */
long mode; /* 0 for reading, 1 for writing */
long width; /* Width of a video frame */
long height; /* Height of a video frame */
double fps; /* Frames per second */
char compressor[8]; /* Type of compressor, 4 bytes + padding for 0 byte */
char compressor2[8]; /* Type of compressor, 4 bytes + padding for 0 byte */
long video_strn; /* Video stream number */
long video_frames; /* Number of video frames */
char video_tag[4]; /* Tag of video data */
long video_pos; /* Number of next frame to be read
(if index present) */
unsigned long max_len; /* maximum video chunk present */
track_t track[AVI_MAX_TRACKS]; // up to AVI_MAX_TRACKS audio tracks supported
off_t pos; /* position in file */
long n_idx; /* number of index entries actually filled */
long max_idx; /* number of index entries actually allocated */
off_t v_codech_off; /* absolut offset of video codec (strh) info */
off_t v_codecf_off; /* absolut offset of video codec (strf) info */
unsigned char (*idx)[16]; /* index entries (AVI idx1 tag) */
video_index_entry *video_index;
off_t last_pos; /* Position of last frame written */
unsigned long last_len; /* Length of last frame written */
int must_use_index; /* Flag if frames are duplicated */
off_t movi_start;
int anum; // total number of audio tracks
int aptr; // current audio working track
BITMAPINFOHEADER_avilib *bitmap_info_header;
WAVEFORMATEX_avilib *wave_format_ex[AVI_MAX_TRACKS];
} avi_t;
#define AVI_MODE_WRITE 0
#define AVI_MODE_READ 1
/* The error codes delivered by avi_open_input_file */
#define AVI_ERR_SIZELIM 1 /* The write of the data would exceed
the maximum size of the AVI file.
This is more a warning than an error
since the file may be closed safely */
#define AVI_ERR_OPEN 2 /* Error opening the AVI file - wrong path
name or file nor readable/writable */
#define AVI_ERR_READ 3 /* Error reading from AVI File */
#define AVI_ERR_WRITE 4 /* Error writing to AVI File,
disk full ??? */
#define AVI_ERR_WRITE_INDEX 5 /* Could not write index to AVI file
during close, file may still be
usable */
#define AVI_ERR_CLOSE 6 /* Could not write header to AVI file
or not truncate the file during close,
file is most probably corrupted */
#define AVI_ERR_NOT_PERM 7 /* Operation not permitted:
trying to read from a file open
for writing or vice versa */
#define AVI_ERR_NO_MEM 8 /* malloc failed */
#define AVI_ERR_NO_AVI 9 /* Not an AVI file */
#define AVI_ERR_NO_HDRL 10 /* AVI file has no has no header list,
corrupted ??? */
#define AVI_ERR_NO_MOVI 11 /* AVI file has no has no MOVI list,
corrupted ??? */
#define AVI_ERR_NO_VIDS 12 /* AVI file contains no video data */
#define AVI_ERR_NO_IDX 13 /* The file has been opened with
getIndex==0, but an operation has been
performed that needs an index */
/* Possible Audio formats */
#ifndef WAVE_FORMAT_PCM
#define WAVE_FORMAT_UNKNOWN (0x0000)
#define WAVE_FORMAT_PCM (0x0001)
#define WAVE_FORMAT_ADPCM (0x0002)
#define WAVE_FORMAT_IBM_CVSD (0x0005)
#define WAVE_FORMAT_ALAW (0x0006)
#define WAVE_FORMAT_MULAW (0x0007)
#define WAVE_FORMAT_OKI_ADPCM (0x0010)
#define WAVE_FORMAT_DVI_ADPCM (0x0011)
#define WAVE_FORMAT_DIGISTD (0x0015)
#define WAVE_FORMAT_DIGIFIX (0x0016)
#define WAVE_FORMAT_YAMAHA_ADPCM (0x0020)
#define WAVE_FORMAT_DSP_TRUESPEECH (0x0022)
#define WAVE_FORMAT_GSM610 (0x0031)
#define IBM_FORMAT_MULAW (0x0101)
#define IBM_FORMAT_ALAW (0x0102)
#define IBM_FORMAT_ADPCM (0x0103)
#endif
#ifdef __cplusplus
extern "C" {
#endif
avi_t* AVI_open_output_file(char * filename);
void AVI_set_video(avi_t *AVI, int width, int height, double fps, char *compressor);
void AVI_set_audio(avi_t *AVI, int channels, long rate, int bits, int format, long mp3rate);
int AVI_write_frame(avi_t *AVI, char *data, long bytes, int keyframe);
int AVI_dup_frame(avi_t *AVI);
int AVI_write_audio(avi_t *AVI, char *data, long bytes);
int AVI_append_audio(avi_t *AVI, char *data, long bytes);
long AVI_bytes_remain(avi_t *AVI);
int AVI_close(avi_t *AVI);
long AVI_bytes_written(avi_t *AVI);
avi_t *AVI_open_input_file(const char *filename, int getIndex);
avi_t *AVI_open_fd(int fd, int getIndex);
int avi_parse_input_file(avi_t *AVI, int getIndex);
long AVI_audio_mp3rate(avi_t *AVI);
long AVI_video_frames(avi_t *AVI);
int AVI_video_width(avi_t *AVI);
int AVI_video_height(avi_t *AVI);
double AVI_frame_rate(avi_t *AVI);
char* AVI_video_compressor(avi_t *AVI);
int AVI_audio_channels(avi_t *AVI);
int AVI_audio_bits(avi_t *AVI);
int AVI_audio_format(avi_t *AVI);
long AVI_audio_rate(avi_t *AVI);
long AVI_audio_bytes(avi_t *AVI);
long AVI_audio_chunks(avi_t *AVI);
long AVI_max_video_chunk(avi_t *AVI);
long AVI_frame_size(avi_t *AVI, long frame);
long AVI_audio_size(avi_t *AVI, long frame);
int AVI_seek_start(avi_t *AVI);
int AVI_set_video_position(avi_t *AVI, long frame);
long AVI_get_video_position(avi_t *AVI, long frame);
long AVI_read_frame(avi_t *AVI, char *vidbuf, int *keyframe);
int AVI_set_audio_position(avi_t *AVI, long byte);
int AVI_set_audio_bitrate(avi_t *AVI, long bitrate);
long AVI_read_audio(avi_t *AVI, char *audbuf, long bytes);
long AVI_read_audio_chunk(avi_t *AVI, char *audbuf);
long AVI_audio_codech_offset(avi_t *AVI);
long AVI_audio_codecf_offset(avi_t *AVI);
long AVI_video_codech_offset(avi_t *AVI);
long AVI_video_codecf_offset(avi_t *AVI);
int AVI_read_data(avi_t *AVI, char *vidbuf, long max_vidbuf,
char *audbuf, long max_audbuf,
long *len);
void AVI_print_error(char *str);
char *AVI_strerror();
char *AVI_syserror();
int AVI_scan(char *name);
int AVI_dump(char *name, int mode);
char *AVI_codec2str(short cc);
int AVI_file_check(char *import_file);
void AVI_info(avi_t *avifile);
uint64_t AVI_max_size();
int avi_update_header(avi_t *AVI);
int AVI_set_audio_track(avi_t *AVI, int track);
int AVI_get_audio_track(avi_t *AVI);
int AVI_audio_tracks(avi_t *AVI);
#ifdef __cplusplus
};
#endif
struct riff_struct
{
unsigned char id[4]; /* RIFF */
uint32_t len;
unsigned char wave_id[4]; /* WAVE */
};
struct chunk_struct
{
unsigned char id[4];
uint32_t len;
};
struct common_struct
{
uint16_t wFormatTag;
uint16_t wChannels;
uint32_t dwSamplesPerSec;
uint32_t dwAvgBytesPerSec;
uint16_t wBlockAlign;
uint16_t wBitsPerSample; /* Only for PCM */
};
struct wave_header
{
struct riff_struct riff;
struct chunk_struct format;
struct common_struct common;
struct chunk_struct data;
};
struct AVIStreamHeader {
long fccType;
long fccHandler;
long dwFlags;
long dwPriority;
long dwInitialFrames;
long dwScale;
long dwRate;
long dwStart;
long dwLength;
long dwSuggestedBufferSize;
long dwQuality;
long dwSampleSize;
};
#endif
#endif/*
* avilib.c
*
* Copyright (C) Thomas streich - June 2001
* multiple audio track support Copyright (C) 2002 Thomas streich
*
* Original code:
* Copyright (C) 1999 Rainer Johanni <[email protected]>
*
* This file is part of transcode, a linux video stream processing tool
*
* transcode 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, or (at your option)
* any later version.
*
* transcode 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 GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
//SLM
#ifdef WIN32
#include <io.h>
#define ftruncate _chsize
#define strncasecmp _strnicmp
typedef int ssize_t;
#endif
#ifdef __CYGWIN__
#include <unistd.h>
#endif
#include "avilib.h"
//#include <time.h>
#define INFO_LIST
/* The following variable indicates the kind of error */
long AVI_errno = 0;
#define MAX_INFO_STRLEN 64
static char id_str[MAX_INFO_STRLEN];
#define FRAME_RATE_SCALE 1000000
/*******************************************************************
* *
* Utilities for writing an AVI File *
* *
*******************************************************************/
static size_t avi_read(int fd, char *buf, size_t len)
{
size_t n = 0;
size_t r = 0;
while (r < len) {
n = read (fd, buf + r, len - r);
if ((ssize_t)n <= 0)
return r;
r += n;
}
return r;
}
static size_t avi_write (int fd, char *buf, size_t len)
{
size_t n = 0;
size_t r = 0;
while (r < len) {
n = write (fd, buf + r, len - r);
if ((ssize_t)n < 0)
return n;
r += n;
}
return r;
}
/* HEADERBYTES: The number of bytes to reserve for the header */
#define HEADERBYTES 2048
/* AVI_MAX_LEN: The maximum length of an AVI file, we stay a bit below
the 2GB limit (Remember: 2*10^9 is smaller than 2 GB) */
#define AVI_MAX_LEN (UINT_MAX-(1<<20)*16-HEADERBYTES)
#define PAD_EVEN(x) ( ((x)+1) & ~1 )
/* Copy n into dst as a 4 byte, little endian number.
Should also work on big endian machines */
static void long2str(unsigned char *dst, int n)
{
dst[0] = (n )&0xff;
dst[1] = (n>> 8)&0xff;
dst[2] = (n>>16)&0xff;
dst[3] = (n>>24)&0xff;
}
/* Convert a string of 4 or 2 bytes to a number,
also working on big endian machines */
static unsigned long str2ulong(unsigned char *str)
{
return ( str[0] | (str[1]<<8) | (str[2]<<16) | (str[3]<<24) );
}
static unsigned long str2ushort(unsigned char *str)
{
return ( str[0] | (str[1]<<8) );
}
/* Calculate audio sample size from number of bits and number of channels.
This may have to be adjusted for eg. 12 bits and stereo */
static int avi_sampsize(avi_t *AVI, int j)
{
int s;
s = ((AVI->track[j].a_bits+7)/8)*AVI->track[j].a_chans;
// if(s==0) s=1; /* avoid possible zero divisions */
if(s<4) s=4; /* avoid possible zero divisions */
return s;
}
/* Add a chunk (=tag and data) to the AVI file,
returns -1 on write error, 0 on success */
static int avi_add_chunk(avi_t *AVI, unsigned char *tag, unsigned char *data, int length)
{
unsigned char c[8];
/* Copy tag and length int c, so that we need only 1 write system call
for these two values */
memcpy(c,tag,4);
long2str(c+4,length);
/* Output tag, length and data, restore previous position
if the write fails */
length = PAD_EVEN(length);
if( avi_write(AVI->fdes,(char *)c,8) != 8 ||
avi_write(AVI->fdes,(char *)data,length) != length )
{
lseek(AVI->fdes,AVI->pos,SEEK_SET);
AVI_errno = AVI_ERR_WRITE;
return -1;
}
/* Update file position */
AVI->pos += 8 + length;
//fprintf(stderr, "pos=%lu %s\n", AVI->pos, tag);
return 0;
}
static int avi_add_index_entry(avi_t *AVI, unsigned char *tag, long flags, unsigned long pos, unsigned long len)
{
void *ptr;
if(AVI->n_idx>=AVI->max_idx) {
ptr = realloc((void *)AVI->idx,(AVI->max_idx+4096)*16);
if(ptr == 0) {
AVI_errno = AVI_ERR_NO_MEM;
return -1;
}
AVI->max_idx += 4096;
AVI->idx = (unsigned char((*)[16]) ) ptr;
}
/* Add index entry */
// fprintf(stderr, "INDEX %s %ld %lu %lu\n", tag, flags, pos, len);
memcpy(AVI->idx[AVI->n_idx],tag,4);
long2str(AVI->idx[AVI->n_idx]+ 4,flags);
long2str(AVI->idx[AVI->n_idx]+ 8, pos);
long2str(AVI->idx[AVI->n_idx]+12, len);
/* Update counter */
AVI->n_idx++;
if(len>AVI->max_len) AVI->max_len=len;
return 0;
}
//SLM
#ifndef S_IRUSR
#define S_IRWXU 00700 /* read, write, execute: owner */
#define S_IRUSR 00400 /* read permission: owner */
#define S_IWUSR 00200 /* write permission: owner */
#define S_IXUSR 00100 /* execute permission: owner */
#define S_IRWXG 00070 /* read, write, execute: group */
#define S_IRGRP 00040 /* read permission: group */
#define S_IWGRP 00020 /* write permission: group */
#define S_IXGRP 00010 /* execute permission: group */
#define S_IRWXO 00007 /* read, write, execute: other */
#define S_IROTH 00004 /* read permission: other */
#define S_IWOTH 00002 /* write permission: other */
#define S_IXOTH 00001 /* execute permission: other */
#endif
/*
AVI_open_output_file: Open an AVI File and write a bunch
of zero bytes as space for the header.
returns a pointer to avi_t on success, a zero pointer on error
*/
avi_t* AVI_open_output_file(char * filename)
{
avi_t *AVI;
int i;
int mask;
unsigned char AVI_header[HEADERBYTES];
/* Allocate the avi_t struct and zero it */
AVI = (avi_t *) malloc(sizeof(avi_t));
if(AVI==0)
{
AVI_errno = AVI_ERR_NO_MEM;
return 0;
}
memset((void *)AVI,0,sizeof(avi_t));
/* Since Linux needs a long time when deleting big files,
we do not truncate the file when we open it.
Instead it is truncated when the AVI file is closed */
mask = umask (0);
umask (mask);
#ifdef WIN32
AVI->fdes = open(filename, O_RDWR|O_CREAT|O_BINARY, (S_IRUSR | S_IWUSR) &~ mask);
#else
AVI->fdes = open(filename, O_RDWR|O_CREAT, (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH) &~ mask);
#endif
if (AVI->fdes < 0)
{
AVI_errno = AVI_ERR_OPEN;
free(AVI);
return 0;
}
/* Write out HEADERBYTES bytes, the header will go here
when we are finished with writing */
for (i=0;i<HEADERBYTES;i++) AVI_header[i] = 0;
i = avi_write(AVI->fdes,(char *)AVI_header,HEADERBYTES);
if (i != HEADERBYTES)
{
close(AVI->fdes);
AVI_errno = AVI_ERR_WRITE;
free(AVI);
return 0;
}
AVI->pos = HEADERBYTES;
AVI->mode = AVI_MODE_WRITE; /* open for writing */
//init
AVI->anum = 0;
AVI->aptr = 0;
return AVI;
}
void AVI_set_video(avi_t *AVI, int width, int height, double fps, char *compressor)
{
/* may only be called if file is open for writing */
if(AVI->mode==AVI_MODE_READ) return;
AVI->width = width;
AVI->height = height;
AVI->fps = fps;
if(strncmp(compressor, "RGB", 3)==0) {
memset(AVI->compressor, 0, 4);
} else {
memcpy(AVI->compressor,compressor,4);
}
AVI->compressor[4] = 0;
avi_update_header(AVI);
}
void AVI_set_audio(avi_t *AVI, int channels, long rate, int bits, int format, long mp3rate)
{
/* may only be called if file is open for writing */
if(AVI->mode==AVI_MODE_READ) return;
//inc audio tracks
AVI->aptr=AVI->anum;
++AVI->anum;
if(AVI->anum > AVI_MAX_TRACKS) {
fprintf(stderr, "error - only %d audio tracks supported\n", AVI_MAX_TRACKS);
exit(1);
}
AVI->track[AVI->aptr].a_chans = channels;
AVI->track[AVI->aptr].a_rate = rate;
AVI->track[AVI->aptr].a_bits = bits;
AVI->track[AVI->aptr].a_fmt = format;
AVI->track[AVI->aptr].mp3rate = mp3rate;
avi_update_header(AVI);
}
#define OUT4CC(s) \
if(nhb<=HEADERBYTES-4) memcpy(AVI_header+nhb,s,4); nhb += 4
#define OUTLONG(n) \
if(nhb<=HEADERBYTES-4) long2str(AVI_header+nhb,n); nhb += 4
#define OUTSHRT(n) \
if(nhb<=HEADERBYTES-2) { \
AVI_header[nhb ] = (n )&0xff; \
AVI_header[nhb+1] = (n>>8)&0xff; \
} \
nhb += 2
//ThOe write preliminary AVI file header: 0 frames, max vid/aud size
int avi_update_header(avi_t *AVI)
{
int njunk, sampsize, hasIndex, ms_per_frame, frate, flag;
int movi_len, hdrl_start, strl_start, j;
unsigned char AVI_header[HEADERBYTES];
long nhb;
//assume max size
movi_len = AVI_MAX_LEN - HEADERBYTES + 4;
//assume index will be written
hasIndex=1;
if(AVI->fps < 0.001) {
frate=0;
ms_per_frame=0;
} else {
frate = (int) (FRAME_RATE_SCALE*AVI->fps + 0.5);
ms_per_frame=(int) (1000000/AVI->fps + 0.5);
}
/* Prepare the file header */
nhb = 0;
/* The RIFF header */
OUT4CC ("RIFF");
OUTLONG(movi_len); // assume max size
OUT4CC ("AVI ");
/* Start the header list */
OUT4CC ("LIST");
OUTLONG(0); /* Length of list in bytes, don't know yet */
hdrl_start = nhb; /* Store start position */
OUT4CC ("hdrl");
/* The main AVI header */
/* The Flags in AVI File header */
#define AVIF_HASINDEX 0x00000010 /* Index at end of file */
#define AVIF_MUSTUSEINDEX 0x00000020
#define AVIF_ISINTERLEAVED 0x00000100
#define AVIF_TRUSTCKTYPE 0x00000800 /* Use CKType to find key frames */
#define AVIF_WASCAPTUREFILE 0x00010000
#define AVIF_COPYRIGHTED 0x00020000
OUT4CC ("avih");
OUTLONG(56); /* # of bytes to follow */
OUTLONG(ms_per_frame); /* Microseconds per frame */
//ThOe ->0
// OUTLONG(10000000); /* MaxBytesPerSec, I hope this will never be used */
OUTLONG(0);
OUTLONG(0); /* PaddingGranularity (whatever that might be) */
/* Other sources call it 'reserved' */
flag = AVIF_ISINTERLEAVED;
if(hasIndex) flag |= AVIF_HASINDEX;
if(hasIndex && AVI->must_use_index) flag |= AVIF_MUSTUSEINDEX;
OUTLONG(flag); /* Flags */
OUTLONG(0); // no frames yet
OUTLONG(0); /* InitialFrames */
OUTLONG(AVI->anum+1);
OUTLONG(0); /* SuggestedBufferSize */
OUTLONG(AVI->width); /* Width */
OUTLONG(AVI->height); /* Height */
/* MS calls the following 'reserved': */
OUTLONG(0); /* TimeScale: Unit used to measure time */
OUTLONG(0); /* DataRate: Data rate of playback */
OUTLONG(0); /* StartTime: Starting time of AVI data */
OUTLONG(0); /* DataLength: Size of AVI data chunk */
/* Start the video stream list ---------------------------------- */
OUT4CC ("LIST");
OUTLONG(0); /* Length of list in bytes, don't know yet */
strl_start = nhb; /* Store start position */
OUT4CC ("strl");
/* The video stream header */
OUT4CC ("strh");
OUTLONG(56); /* # of bytes to follow */
OUT4CC ("vids"); /* Type */
OUT4CC (AVI->compressor); /* Handler */
OUTLONG(0); /* Flags */
OUTLONG(0); /* Reserved, MS says: wPriority, wLanguage */
OUTLONG(0); /* InitialFrames */
OUTLONG(FRAME_RATE_SCALE); /* Scale */
OUTLONG(frate); /* Rate: Rate/Scale == samples/second */
OUTLONG(0); /* Start */
OUTLONG(0); // no frames yet
OUTLONG(0); /* SuggestedBufferSize */
OUTLONG(-1); /* Quality */
OUTLONG(0); /* SampleSize */
OUTLONG(0); /* Frame */
OUTLONG(0); /* Frame */
// OUTLONG(0); /* Frame */
//OUTLONG(0); /* Frame */
/* The video stream format */
OUT4CC ("strf");
OUTLONG(40); /* # of bytes to follow */
OUTLONG(40); /* Size */
OUTLONG(AVI->width); /* Width */
OUTLONG(AVI->height); /* Height */
OUTSHRT(1); OUTSHRT(24); /* Planes, Count */
OUT4CC (AVI->compressor); /* Compression */
// ThOe (*3)
OUTLONG(AVI->width*AVI->height*3); /* SizeImage (in bytes?) */
OUTLONG(0); /* XPelsPerMeter */
OUTLONG(0); /* YPelsPerMeter */
OUTLONG(0); /* ClrUsed: Number of colors used */
OUTLONG(0); /* ClrImportant: Number of colors important */
/* Finish stream list, i.e. put number of bytes in the list to proper pos */
long2str(AVI_header+strl_start-4,nhb-strl_start);
/* Start the audio stream list ---------------------------------- */
for(j=0; j<AVI->anum; ++j) {
sampsize = avi_sampsize(AVI, j);
OUT4CC ("LIST");
OUTLONG(0); /* Length of list in bytes, don't know yet */
strl_start = nhb; /* Store start position */
OUT4CC ("strl");
/* The audio stream header */
OUT4CC ("strh");
OUTLONG(56); /* # of bytes to follow */
OUT4CC ("auds");
// -----------
// ThOe
OUTLONG(0); /* Format (Optionally) */
// -----------
OUTLONG(0); /* Flags */
OUTLONG(0); /* Reserved, MS says: wPriority, wLanguage */
OUTLONG(0); /* InitialFrames */
// ThOe /4
OUTLONG(sampsize/4); /* Scale */
OUTLONG(1000*AVI->track[j].mp3rate/8);
OUTLONG(0); /* Start */
OUTLONG(4*AVI->track[j].audio_bytes/sampsize); /* Length */
OUTLONG(0); /* SuggestedBufferSize */
OUTLONG(-1); /* Quality */
// ThOe /4
OUTLONG(sampsize/4); /* SampleSize */
OUTLONG(0); /* Frame */
OUTLONG(0); /* Frame */
// OUTLONG(0); /* Frame */
//OUTLONG(0); /* Frame */
/* The audio stream format */
OUT4CC ("strf");
OUTLONG(16); /* # of bytes to follow */
OUTSHRT(AVI->track[j].a_fmt); /* Format */
OUTSHRT(AVI->track[j].a_chans); /* Number of channels */
OUTLONG(AVI->track[j].a_rate); /* SamplesPerSec */
// ThOe
OUTLONG(1000*AVI->track[j].mp3rate/8);
//ThOe (/4)
OUTSHRT(sampsize/4); /* BlockAlign */
OUTSHRT(AVI->track[j].a_bits); /* BitsPerSample */
/* Finish stream list, i.e. put number of bytes in the list to proper pos */
long2str(AVI_header+strl_start-4,nhb-strl_start);
}
/* Finish header list */
long2str(AVI_header+hdrl_start-4,nhb-hdrl_start);
/* Calculate the needed amount of junk bytes, output junk */
njunk = HEADERBYTES - nhb - 8 - 12;
/* Safety first: if njunk <= 0, somebody has played with
HEADERBYTES without knowing what (s)he did.
This is a fatal error */
if(njunk<=0)
{
fprintf(stderr,"AVI_close_output_file: # of header bytes too small\n");
exit(1);
}
OUT4CC ("JUNK");
OUTLONG(njunk);
memset(AVI_header+nhb,0,njunk);
//2001-11-14 added id string
if(njunk > strlen(id_str)+8) {
//sprintf(id_str, "%s-%s", PACKAGE, VERSION);
//memcpy(AVI_header+nhb, id_str, strlen(id_str));
}
nhb += njunk;
/* Start the movi list */
OUT4CC ("LIST");
OUTLONG(movi_len); /* Length of list in bytes */
OUT4CC ("movi");
/* Output the header, truncate the file to the number of bytes
actually written, report an error if someting goes wrong */
if ( lseek(AVI->fdes,0,SEEK_SET)<0 ||
avi_write(AVI->fdes,(char *)AVI_header,HEADERBYTES)!=HEADERBYTES ||
lseek(AVI->fdes,AVI->pos,SEEK_SET)<0)
{
AVI_errno = AVI_ERR_CLOSE;
return -1;
}
return 0;
}
/*
Write the header of an AVI file and close it.
returns 0 on success, -1 on write error.
*/
static int avi_close_output_file(avi_t *AVI)
{
int ret, njunk, sampsize, hasIndex, ms_per_frame, frate, idxerror, flag;
unsigned long movi_len;
int hdrl_start, strl_start, j;
unsigned char AVI_header[HEADERBYTES];
long nhb;
#ifdef INFO_LIST
long info_len;
// time_t calptr;
#endif
/* Calculate length of movi list */
movi_len = AVI->pos - HEADERBYTES + 4;
/* Try to ouput the index entries. This may fail e.g. if no space
is left on device. We will report this as an error, but we still
try to write the header correctly (so that the file still may be
readable in the most cases */
idxerror = 0;
// fprintf(stderr, "pos=%lu, index_len=%ld \n", AVI->pos, AVI->n_idx*16);
ret = avi_add_chunk(AVI, (unsigned char *)"idx1", (unsigned char *)AVI->idx, AVI->n_idx*16);
hasIndex = (ret==0);
//fprintf(stderr, "pos=%lu, index_len=%d\n", AVI->pos, hasIndex);
if(ret) {
idxerror = 1;
AVI_errno = AVI_ERR_WRITE_INDEX;
}
/* Calculate Microseconds per frame */
if(AVI->fps < 0.001) {
frate=0;
ms_per_frame=0;
} else {
frate = (int) (FRAME_RATE_SCALE*AVI->fps + 0.5);
ms_per_frame=(int) (1000000/AVI->fps + 0.5);
}
/* Prepare the file header */
nhb = 0;
/* The RIFF header */
OUT4CC ("RIFF");
OUTLONG(AVI->pos - 8); /* # of bytes to follow */
OUT4CC ("AVI ");
/* Start the header list */
OUT4CC ("LIST");
OUTLONG(0); /* Length of list in bytes, don't know yet */
hdrl_start = nhb; /* Store start position */
OUT4CC ("hdrl");
/* The main AVI header */
/* The Flags in AVI File header */
#define AVIF_HASINDEX 0x00000010 /* Index at end of file */
#define AVIF_MUSTUSEINDEX 0x00000020
#define AVIF_ISINTERLEAVED 0x00000100
#define AVIF_TRUSTCKTYPE 0x00000800 /* Use CKType to find key frames */
#define AVIF_WASCAPTUREFILE 0x00010000
#define AVIF_COPYRIGHTED 0x00020000
OUT4CC ("avih");
OUTLONG(56); /* # of bytes to follow */
OUTLONG(ms_per_frame); /* Microseconds per frame */
//ThOe ->0
// OUTLONG(10000000); /* MaxBytesPerSec, I hope this will never be used */
OUTLONG(0);
OUTLONG(0); /* PaddingGranularity (whatever that might be) */
/* Other sources call it 'reserved' */
flag = AVIF_ISINTERLEAVED;
if(hasIndex) flag |= AVIF_HASINDEX;
if(hasIndex && AVI->must_use_index) flag |= AVIF_MUSTUSEINDEX;
OUTLONG(flag); /* Flags */
OUTLONG(AVI->video_frames); /* TotalFrames */
OUTLONG(0); /* InitialFrames */
OUTLONG(AVI->anum+1);
// if (AVI->track[0].audio_bytes)
// { OUTLONG(2); } /* Streams */
// else
// { OUTLONG(1); } /* Streams */
OUTLONG(0); /* SuggestedBufferSize */
OUTLONG(AVI->width); /* Width */
OUTLONG(AVI->height); /* Height */
/* MS calls the following 'reserved': */
OUTLONG(0); /* TimeScale: Unit used to measure time */
OUTLONG(0); /* DataRate: Data rate of playback */
OUTLONG(0); /* StartTime: Starting time of AVI data */
OUTLONG(0); /* DataLength: Size of AVI data chunk */
/* Start the video stream list ---------------------------------- */
OUT4CC ("LIST");
OUTLONG(0); /* Length of list in bytes, don't know yet */
strl_start = nhb; /* Store start position */
OUT4CC ("strl");
/* The video stream header */
OUT4CC ("strh");
OUTLONG(56); /* # of bytes to follow */
OUT4CC ("vids"); /* Type */
OUT4CC (AVI->compressor); /* Handler */
OUTLONG(0); /* Flags */
OUTLONG(0); /* Reserved, MS says: wPriority, wLanguage */
OUTLONG(0); /* InitialFrames */
OUTLONG(FRAME_RATE_SCALE); /* Scale */
OUTLONG(frate); /* Rate: Rate/Scale == samples/second */
OUTLONG(0); /* Start */
OUTLONG(AVI->video_frames); /* Length */
OUTLONG(0); /* SuggestedBufferSize */
OUTLONG(-1); /* Quality */
OUTLONG(0); /* SampleSize */
OUTLONG(0); /* Frame */
OUTLONG(0); /* Frame */
// OUTLONG(0); /* Frame */
//OUTLONG(0); /* Frame */
/* The video stream format */
OUT4CC ("strf");
OUTLONG(40); /* # of bytes to follow */
OUTLONG(40); /* Size */
OUTLONG(AVI->width); /* Width */
OUTLONG(AVI->height); /* Height */
OUTSHRT(1); OUTSHRT(24); /* Planes, Count */
OUT4CC (AVI->compressor); /* Compression */
// ThOe (*3)
OUTLONG(AVI->width*AVI->height*3); /* SizeImage (in bytes?) */
OUTLONG(0); /* XPelsPerMeter */
OUTLONG(0); /* YPelsPerMeter */
OUTLONG(0); /* ClrUsed: Number of colors used */
OUTLONG(0); /* ClrImportant: Number of colors important */
/* Finish stream list, i.e. put number of bytes in the list to proper pos */
long2str(AVI_header+strl_start-4,nhb-strl_start);
/* Start the audio stream list ---------------------------------- */
for(j=0; j<AVI->anum; ++j) {
//if (AVI->track[j].a_chans && AVI->track[j].audio_bytes)
{
sampsize = avi_sampsize(AVI, j);
OUT4CC ("LIST");
OUTLONG(0); /* Length of list in bytes, don't know yet */
strl_start = nhb; /* Store start position */
OUT4CC ("strl");
/* The audio stream header */
OUT4CC ("strh");
OUTLONG(56); /* # of bytes to follow */
OUT4CC ("auds");
// -----------
// ThOe
OUTLONG(0); /* Format (Optionally) */
// -----------
OUTLONG(0); /* Flags */
OUTLONG(0); /* Reserved, MS says: wPriority, wLanguage */
OUTLONG(0); /* InitialFrames */
// ThOe /4
OUTLONG(sampsize/4); /* Scale */
OUTLONG(1000*AVI->track[j].mp3rate/8);
OUTLONG(0); /* Start */
OUTLONG(4*AVI->track[j].audio_bytes/sampsize); /* Length */
OUTLONG(0); /* SuggestedBufferSize */
OUTLONG(-1); /* Quality */
// ThOe /4
OUTLONG(sampsize/4); /* SampleSize */
OUTLONG(0); /* Frame */
OUTLONG(0); /* Frame */
// OUTLONG(0); /* Frame */
//OUTLONG(0); /* Frame */
/* The audio stream format */
OUT4CC ("strf");
OUTLONG(16); /* # of bytes to follow */
OUTSHRT(AVI->track[j].a_fmt); /* Format */
OUTSHRT(AVI->track[j].a_chans); /* Number of channels */
OUTLONG(AVI->track[j].a_rate); /* SamplesPerSec */
// ThOe
OUTLONG(1000*AVI->track[j].mp3rate/8);
//ThOe (/4)
OUTSHRT(sampsize/4); /* BlockAlign */
OUTSHRT(AVI->track[j].a_bits); /* BitsPerSample */
/* Finish stream list, i.e. put number of bytes in the list to proper pos */
}
long2str(AVI_header+strl_start-4,nhb-strl_start);
}
/* Finish header list */
long2str(AVI_header+hdrl_start-4,nhb-hdrl_start);
// add INFO list --- (0.6.0pre4)
#ifdef INFO_LIST
OUT4CC ("LIST");
//FIXME
info_len = MAX_INFO_STRLEN + 12;
OUTLONG(info_len);
OUT4CC ("INFO");
// OUT4CC ("INAM");
// OUTLONG(MAX_INFO_STRLEN);
// sprintf(id_str, "\t");
// memset(AVI_header+nhb, 0, MAX_INFO_STRLEN);
// memcpy(AVI_header+nhb, id_str, strlen(id_str));
// nhb += MAX_INFO_STRLEN;
OUT4CC ("ISFT");
OUTLONG(MAX_INFO_STRLEN);
//sprintf(id_str, "%s-%s", PACKAGE, VERSION);
memset(AVI_header+nhb, 0, MAX_INFO_STRLEN);
//memcpy(AVI_header+nhb, id_str, strlen(id_str));
nhb += MAX_INFO_STRLEN;
// OUT4CC ("ICMT");
// OUTLONG(MAX_INFO_STRLEN);
// calptr=time(NULL);
// sprintf(id_str, "\t%s %s", ctime(&calptr), "");
// memset(AVI_header+nhb, 0, MAX_INFO_STRLEN);
// memcpy(AVI_header+nhb, id_str, 25);
// nhb += MAX_INFO_STRLEN;
#endif
// ----------------------------
/* Calculate the needed amount of junk bytes, output junk */
njunk = HEADERBYTES - nhb - 8 - 12;
/* Safety first: if njunk <= 0, somebody has played with
HEADERBYTES without knowing what (s)he did.
This is a fatal error */
if(njunk<=0)
{
fprintf(stderr,"AVI_close_output_file: # of header bytes too small\n");
exit(1);
}
OUT4CC ("JUNK");
OUTLONG(njunk);
memset(AVI_header+nhb,0,njunk);
nhb += njunk;
/* Start the movi list */
OUT4CC ("LIST");
OUTLONG(movi_len); /* Length of list in bytes */
OUT4CC ("movi");
/* Output the header, truncate the file to the number of bytes
actually written, report an error if someting goes wrong */
if ( lseek(AVI->fdes,0,SEEK_SET)<0 ||
avi_write(AVI->fdes,(char *)AVI_header,HEADERBYTES)!=HEADERBYTES ||
(AVI->pos>0&&ftruncate(AVI->fdes,AVI->pos)<0 ))
{
AVI_errno = AVI_ERR_CLOSE;
return -1;
}
if(idxerror) return -1;
return 0;
}
/*
AVI_write_data:
Add video or audio data to the file;
Return values:
0 No error;
-1 Error, AVI_errno is set appropriatly;
*/
static int avi_write_data(avi_t *AVI, char *data, unsigned long length, int audio, int keyframe)
{
int n;
unsigned char astr[5];
/* Check for maximum file length */
if ( (AVI->pos + 8 + length + 8 + (AVI->n_idx+1)*16) > AVI_MAX_LEN ) {
AVI_errno = AVI_ERR_SIZELIM;
return -1;
}
/* Add index entry */
//set tag for current audio track
sprintf((char *)astr, "0%1dwb", (int)(AVI->aptr+1));
if(audio)
n = avi_add_index_entry(AVI,astr,0x00,AVI->pos,length);
else
n = avi_add_index_entry(AVI,(unsigned char *)"00db",((keyframe)?0x10:0x0),AVI->pos,length);
if(n) return -1;
/* Output tag and data */
if(audio)
n = avi_add_chunk(AVI,astr,(unsigned char *)data,length);
else
n = avi_add_chunk(AVI,(unsigned char *)"00db",(unsigned char *)data,length);
if (n) return -1;
return 0;
}
int AVI_write_frame(avi_t *AVI, char *data, long bytes, int keyframe)
{
unsigned long pos;
if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
pos = AVI->pos;
if(avi_write_data(AVI,data,bytes,0,keyframe)) return -1;
AVI->last_pos = pos;
AVI->last_len = bytes;
AVI->video_frames++;
return 0;
}
int AVI_dup_frame(avi_t *AVI)
{
if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(AVI->last_pos==0) return 0; /* No previous real frame */
if(avi_add_index_entry(AVI,(unsigned char *)"00db",0x10,AVI->last_pos,AVI->last_len)) return -1;
AVI->video_frames++;
AVI->must_use_index = 1;
return 0;
}
int AVI_write_audio(avi_t *AVI, char *data, long bytes)
{
if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if( avi_write_data(AVI,data,bytes,1,0) ) return -1;
AVI->track[AVI->aptr].audio_bytes += bytes;
return 0;
}
int AVI_append_audio(avi_t *AVI, char *data, long bytes)
{
long i, length, pos;
unsigned char c[4];
if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
// update last index entry:
--AVI->n_idx;
length = str2ulong(AVI->idx[AVI->n_idx]+12);
pos = str2ulong(AVI->idx[AVI->n_idx]+8);
//update;
long2str(AVI->idx[AVI->n_idx]+12,length+bytes);
++AVI->n_idx;
AVI->track[AVI->aptr].audio_bytes += bytes;
//update chunk header
lseek(AVI->fdes, pos+4, SEEK_SET);
long2str(c, length+bytes);
avi_write(AVI->fdes, (char *)c, 4);
lseek(AVI->fdes, pos+8+length, SEEK_SET);
i=PAD_EVEN(length + bytes);
bytes = i - length;
avi_write(AVI->fdes, data, bytes);
AVI->pos = pos + 8 + i;
return 0;
}
long AVI_bytes_remain(avi_t *AVI)
{
if(AVI->mode==AVI_MODE_READ) return 0;
return ( AVI_MAX_LEN - (AVI->pos + 8 + 16*AVI->n_idx));
}
long AVI_bytes_written(avi_t *AVI)
{
if(AVI->mode==AVI_MODE_READ) return 0;
return (AVI->pos + 8 + 16*AVI->n_idx);
}
int AVI_set_audio_track(avi_t *AVI, int track)
{
if(track < 0 || track + 1 > AVI->anum) return(-1);
//this info is not written to file anyway
AVI->aptr=track;
return 0;
}
int AVI_get_audio_track(avi_t *AVI)
{
return(AVI->aptr);
}
/*******************************************************************
* *
* Utilities for reading video and audio from an AVI File *
* *
*******************************************************************/
int AVI_close(avi_t *AVI)
{
int ret, i;
/* If the file was open for writing, the header and index still have
to be written */
if(AVI->mode == AVI_MODE_WRITE)
ret = avi_close_output_file(AVI);
else
ret = 0;
/* Even if there happened an error, we first clean up */
close(AVI->fdes);
if(AVI->idx) free(AVI->idx);
if(AVI->video_index) free(AVI->video_index);
//FIXME
//if(AVI->audio_index) free(AVI->audio_index);
if (AVI->bitmap_info_header)
free(AVI->bitmap_info_header);
for (i = 0; i < AVI->anum; i++) {
if (AVI->wave_format_ex[i])
free(AVI->wave_format_ex[i]);
if (AVI->track[i].audio_chunks)
free(AVI->track[i].audio_index);
}
free(AVI);
return ret;
}
#define ERR_EXIT(x) \
{ \
AVI_close(AVI); \
AVI_errno = x; \
return 0; \
}
avi_t *AVI_open_input_file(const char *filename, int getIndex)
{
avi_t *AVI=NULL;
/* Create avi_t structure */
AVI = (avi_t *) malloc(sizeof(avi_t));
if(AVI==NULL)
{
AVI_errno = AVI_ERR_NO_MEM;
return 0;
}
memset((void *)AVI,0,sizeof(avi_t));
AVI->mode = AVI_MODE_READ; /* open for reading */
/* Open the file */
#ifdef WIN32
AVI->fdes = open(filename,O_RDONLY|O_BINARY);
#else
AVI->fdes = open(filename,O_RDONLY);
#endif
if(AVI->fdes < 0)
{
AVI_errno = AVI_ERR_OPEN;
free(AVI);
return 0;
}
avi_parse_input_file(AVI, getIndex);
AVI->aptr=0; //reset
return AVI;
}
avi_t *AVI_open_fd(int fd, int getIndex)
{
avi_t *AVI=NULL;
/* Create avi_t structure */
AVI = (avi_t *) malloc(sizeof(avi_t));
if(AVI==NULL)
{
AVI_errno = AVI_ERR_NO_MEM;
return 0;
}
memset((void *)AVI,0,sizeof(avi_t));
AVI->mode = AVI_MODE_READ; /* open for reading */
// file alread open
AVI->fdes = fd;
avi_parse_input_file(AVI, getIndex);
AVI->aptr=0; //reset
return AVI;
}
int avi_parse_input_file(avi_t *AVI, int getIndex)
{
long i, rate, scale, idx_type;
off_t n;
unsigned char *hdrl_data;
long header_offset=0, hdrl_len=0;
long nvi, nai[AVI_MAX_TRACKS], ioff;
long tot[AVI_MAX_TRACKS];
int j;
int lasttag = 0;
int vids_strh_seen = 0;
int vids_strf_seen = 0;
int auds_strh_seen = 0;
// int auds_strf_seen = 0;
int num_stream = 0;
char data[256];
/* Read first 12 bytes and check that this is an AVI file */
if( avi_read(AVI->fdes,data,12) != 12 ) ERR_EXIT(AVI_ERR_READ)
if( strncasecmp(data ,"RIFF",4) !=0 ||
strncasecmp(data+8,"AVI ",4) !=0 ) ERR_EXIT(AVI_ERR_NO_AVI)
/* Go through the AVI file and extract the header list,
the start position of the 'movi' list and an optionally
present idx1 tag */
hdrl_data = 0;
while(1)
{
if( avi_read(AVI->fdes,data,8) != 8 ) break; /* We assume it's EOF */
n = str2ulong((unsigned char *)data+4);
n = PAD_EVEN(n);
if(strncasecmp(data,"LIST",4) == 0)
{
if( avi_read(AVI->fdes,data,4) != 4 ) ERR_EXIT(AVI_ERR_READ)
n -= 4;
if(strncasecmp(data,"hdrl",4) == 0)
{
hdrl_len = n;
hdrl_data = (unsigned char *) malloc(n);
if(hdrl_data==0) ERR_EXIT(AVI_ERR_NO_MEM);
// offset of header
header_offset = lseek(AVI->fdes,0,SEEK_CUR);
if( avi_read(AVI->fdes,(char *)hdrl_data,n) != n ) ERR_EXIT(AVI_ERR_READ)
}
else if(strncasecmp(data,"movi",4) == 0)
{
AVI->movi_start = lseek(AVI->fdes,0,SEEK_CUR);
lseek(AVI->fdes,n,SEEK_CUR);
}
else
lseek(AVI->fdes,n,SEEK_CUR);
}
else if(strncasecmp(data,"idx1",4) == 0)
{
/* n must be a multiple of 16, but the reading does not
break if this is not the case */
AVI->n_idx = AVI->max_idx = n/16;
AVI->idx = (unsigned char((*)[16]) ) malloc(n);
if(AVI->idx==0) ERR_EXIT(AVI_ERR_NO_MEM)
if(avi_read(AVI->fdes, (char *) AVI->idx, n) != n ) ERR_EXIT(AVI_ERR_READ)
}
else
lseek(AVI->fdes,n,SEEK_CUR);
}
if(!hdrl_data ) ERR_EXIT(AVI_ERR_NO_HDRL)
if(!AVI->movi_start) ERR_EXIT(AVI_ERR_NO_MOVI)
/* Interpret the header list */
for(i=0;i<hdrl_len;)
{
/* List tags are completly ignored */
if(strncasecmp((char *)hdrl_data+i,"LIST",4)==0) { i+= 12; continue; }
n = str2ulong(hdrl_data+i+4);
n = PAD_EVEN(n);
/* Interpret the tag and its args */
if(strncasecmp((char *)hdrl_data+i,"strh",4)==0)
{
i += 8;
if(strncasecmp((char *)hdrl_data+i,"vids",4) == 0 && !vids_strh_seen)
{
memcpy(AVI->compressor,hdrl_data+i+4,4);
AVI->compressor[4] = 0;
// ThOe
AVI->v_codech_off = header_offset + i+4;
scale = str2ulong(hdrl_data+i+20);
rate = str2ulong(hdrl_data+i+24);
if(scale!=0) AVI->fps = (double)rate/(double)scale;
AVI->video_frames = str2ulong(hdrl_data+i+32);
AVI->video_strn = num_stream;
AVI->max_len = 0;
vids_strh_seen = 1;
lasttag = 1; /* vids */
}
else if (strncasecmp ((char *)hdrl_data+i,"auds",4) ==0 && ! auds_strh_seen)
{
//inc audio tracks
AVI->aptr=AVI->anum;
++AVI->anum;
if(AVI->anum > AVI_MAX_TRACKS) {
fprintf(stderr, "error - only %d audio tracks supported\n", AVI_MAX_TRACKS);
return(-1);
}
AVI->track[AVI->aptr].audio_bytes = str2ulong(hdrl_data+i+32)*avi_sampsize(AVI, 0);
AVI->track[AVI->aptr].audio_strn = num_stream;
// auds_strh_seen = 1;
lasttag = 2; /* auds */
// ThOe
AVI->track[AVI->aptr].a_codech_off = header_offset + i;
}
else
lasttag = 0;
num_stream++;
}
else if(strncasecmp((char *)hdrl_data+i,"strf",4)==0)
{
i += 8;
if(lasttag == 1)
{
BITMAPINFOHEADER_avilib bih;
memcpy(&bih, hdrl_data + i, sizeof(BITMAPINFOHEADER_avilib));
AVI->bitmap_info_header = (BITMAPINFOHEADER_avilib *)malloc(bih.bi_size);
if (AVI->bitmap_info_header != NULL)
memcpy(AVI->bitmap_info_header, hdrl_data + i, bih.bi_size);
AVI->width = str2ulong(hdrl_data+i+4);
AVI->height = str2ulong(hdrl_data+i+8);
vids_strf_seen = 1;
//ThOe
AVI->v_codecf_off = header_offset + i+16;
memcpy(AVI->compressor2, hdrl_data+i+16, 4);
AVI->compressor2[4] = 0;
}
else if(lasttag == 2)
{
WAVEFORMATEX_avilib *wfe;
char *nwfe;
int wfes;
if ((hdrl_len - i) < sizeof(WAVEFORMATEX_avilib))
wfes = hdrl_len - i;
else
wfes = sizeof(WAVEFORMATEX_avilib);
wfe = (WAVEFORMATEX_avilib *)malloc(sizeof(WAVEFORMATEX_avilib));
if (wfe != NULL) {
memset(wfe, 0, sizeof(WAVEFORMATEX_avilib));
memcpy(wfe, hdrl_data + i, wfes);
if (wfe->cb_size != 0) {
nwfe = (char *)realloc(wfe, sizeof(WAVEFORMATEX_avilib) +
wfe->cb_size);
if (nwfe != 0) {
off_t lpos = lseek(AVI->fdes, 0, SEEK_CUR);
lseek(AVI->fdes, header_offset + i + sizeof(WAVEFORMATEX_avilib),
SEEK_SET);
wfe = (WAVEFORMATEX_avilib *)nwfe;
nwfe = &nwfe[sizeof(WAVEFORMATEX_avilib)];
avi_read(AVI->fdes, nwfe, wfe->cb_size);
lseek(AVI->fdes, lpos, SEEK_SET);
}
}
AVI->wave_format_ex[AVI->aptr] = wfe;
}
AVI->track[AVI->aptr].a_fmt = str2ushort(hdrl_data+i );
//ThOe
AVI->track[AVI->aptr].a_codecf_off = header_offset + i;
AVI->track[AVI->aptr].a_chans = str2ushort(hdrl_data+i+2);
AVI->track[AVI->aptr].a_rate = str2ulong (hdrl_data+i+4);
//ThOe: read mp3bitrate
AVI->track[AVI->aptr].mp3rate = 8*str2ulong(hdrl_data+i+8)/1000;
//:ThOe
AVI->track[AVI->aptr].a_bits = str2ushort(hdrl_data+i+14);
// auds_strf_seen = 1;
}
lasttag = 0;
}
else
{
i += 8;
lasttag = 0;
}
i += n;
}
free(hdrl_data);
if(!vids_strh_seen || !vids_strf_seen) ERR_EXIT(AVI_ERR_NO_VIDS)
AVI->video_tag[0] = AVI->video_strn/10 + '0';
AVI->video_tag[1] = AVI->video_strn%10 + '0';
AVI->video_tag[2] = 'd';
AVI->video_tag[3] = 'b';
/* Audio tag is set to "99wb" if no audio present */
if(!AVI->track[0].a_chans) AVI->track[0].audio_strn = 99;
for(j=0; j<AVI->anum; ++j) {
AVI->track[j].audio_tag[0] = (j+1)/10 + '0';
AVI->track[j].audio_tag[1] = (j+1)%10 + '0';
AVI->track[j].audio_tag[2] = 'w';
AVI->track[j].audio_tag[3] = 'b';
}
lseek(AVI->fdes,AVI->movi_start,SEEK_SET);
/* get index if wanted */
if(!getIndex) return(0);
/* if the file has an idx1, check if this is relative
to the start of the file or to the start of the movi list */
idx_type = 0;
if(AVI->idx)
{
off_t pos, len;
/* Search the first videoframe in the idx1 and look where
it is in the file */
for(i=0;i<AVI->n_idx;i++)
if( strncasecmp((char *)AVI->idx[i],(char *)AVI->video_tag,3)==0 ) break;
if(i>=AVI->n_idx) ERR_EXIT(AVI_ERR_NO_VIDS)
pos = str2ulong(AVI->idx[i]+ 8);
len = str2ulong(AVI->idx[i]+12);
lseek(AVI->fdes,pos,SEEK_SET);
if(avi_read(AVI->fdes,data,8)!=8) ERR_EXIT(AVI_ERR_READ)
if( strncasecmp(data,(char *)AVI->idx[i],4)==0 && str2ulong((unsigned char *)data+4)==len )
{
idx_type = 1; /* Index from start of file */
}
else
{
lseek(AVI->fdes,pos+AVI->movi_start-4,SEEK_SET);
if(avi_read(AVI->fdes,data,8)!=8) ERR_EXIT(AVI_ERR_READ)
if( strncasecmp(data,(char *)AVI->idx[i],4)==0 && str2ulong((unsigned char *)data+4)==len )
{
idx_type = 2; /* Index from start of movi list */
}
}
/* idx_type remains 0 if neither of the two tests above succeeds */
}
if(idx_type == 0)
{
/* we must search through the file to get the index */
lseek(AVI->fdes, AVI->movi_start, SEEK_SET);
AVI->n_idx = 0;
while(1)
{
if( avi_read(AVI->fdes,data,8) != 8 ) break;
n = str2ulong((unsigned char *)data+4);
/* The movi list may contain sub-lists, ignore them */
if(strncasecmp(data,"LIST",4)==0)
{
lseek(AVI->fdes,4,SEEK_CUR);
continue;
}
/* Check if we got a tag ##db, ##dc or ##wb */
if( ( (data[2]=='d' || data[2]=='D') &&
(data[3]=='b' || data[3]=='B' || data[3]=='c' || data[3]=='C') )
|| ( (data[2]=='w' || data[2]=='W') &&
(data[3]=='b' || data[3]=='B') ) )
{
avi_add_index_entry(AVI,(unsigned char *)data,0,lseek(AVI->fdes,0,SEEK_CUR)-8,n);
}
lseek(AVI->fdes,PAD_EVEN(n),SEEK_CUR);
}
idx_type = 1;
}
/* Now generate the video index and audio index arrays */
nvi = 0;
for(j=0; j<AVI->anum; ++j) nai[j] = 0;
for(i=0;i<AVI->n_idx;i++) {
if(strncasecmp((char *)AVI->idx[i],AVI->video_tag,3) == 0) nvi++;
for(j=0; j<AVI->anum; ++j) if(strncasecmp((char *)AVI->idx[i], AVI->track[j].audio_tag,4) == 0) nai[j]++;
}
AVI->video_frames = nvi;
for(j=0; j<AVI->anum; ++j) AVI->track[j].audio_chunks = nai[j];
// fprintf(stderr, "chunks = %ld %d %s\n", AVI->track[0].audio_chunks, AVI->anum, AVI->track[0].audio_tag);
if(AVI->video_frames==0) ERR_EXIT(AVI_ERR_NO_VIDS);
AVI->video_index = (video_index_entry *) malloc(nvi*sizeof(video_index_entry));
if(AVI->video_index==0) ERR_EXIT(AVI_ERR_NO_MEM);
for(j=0; j<AVI->anum; ++j) {
if(AVI->track[j].audio_chunks) {
AVI->track[j].audio_index = (audio_index_entry *) malloc((nai[j]+1)*sizeof(audio_index_entry));
memset(AVI->track[j].audio_index, 0, (nai[j]+1)*(sizeof(audio_index_entry)));
if(AVI->track[j].audio_index==0) ERR_EXIT(AVI_ERR_NO_MEM);
}
}
nvi = 0;
for(j=0; j<AVI->anum; ++j) nai[j] = tot[j] = 0;
ioff = idx_type == 1 ? 8 : AVI->movi_start+4;
for(i=0;i<AVI->n_idx;i++) {
//video
if(strncasecmp((char *)AVI->idx[i],AVI->video_tag,3) == 0) {
AVI->video_index[nvi].key = str2ulong(AVI->idx[i]+ 4);
AVI->video_index[nvi].pos = str2ulong(AVI->idx[i]+ 8)+ioff;
AVI->video_index[nvi].len = str2ulong(AVI->idx[i]+12);
nvi++;
}
//audio
for(j=0; j<AVI->anum; ++j) {
if(strncasecmp((char *)AVI->idx[i],AVI->track[j].audio_tag,4) == 0) {
AVI->track[j].audio_index[nai[j]].pos = str2ulong(AVI->idx[i]+ 8)+ioff;
AVI->track[j].audio_index[nai[j]].len = str2ulong(AVI->idx[i]+12);
AVI->track[j].audio_index[nai[j]].tot = tot[j];
tot[j] += AVI->track[j].audio_index[nai[j]].len;
nai[j]++;
}
}
}
for(j=0; j<AVI->anum; ++j) AVI->track[j].audio_bytes = tot[j];
/* Reposition the file */
lseek(AVI->fdes,AVI->movi_start,SEEK_SET);
AVI->video_pos = 0;
return(0);
}
long AVI_video_frames(avi_t *AVI)
{
return AVI->video_frames;
}
int AVI_video_width(avi_t *AVI)
{
return AVI->width;
}
int AVI_video_height(avi_t *AVI)
{
return AVI->height;
}
double AVI_frame_rate(avi_t *AVI)
{
return AVI->fps;
}
char* AVI_video_compressor(avi_t *AVI)
{
return AVI->compressor2;
}
long AVI_max_video_chunk(avi_t *AVI)
{
return AVI->max_len;
}
int AVI_audio_tracks(avi_t *AVI)
{
return(AVI->anum);
}
int AVI_audio_channels(avi_t *AVI)
{
return AVI->track[AVI->aptr].a_chans;
}
long AVI_audio_mp3rate(avi_t *AVI)
{
return AVI->track[AVI->aptr].mp3rate;
}
int AVI_audio_bits(avi_t *AVI)
{
return AVI->track[AVI->aptr].a_bits;
}
int AVI_audio_format(avi_t *AVI)
{
return AVI->track[AVI->aptr].a_fmt;
}
long AVI_audio_rate(avi_t *AVI)
{
return AVI->track[AVI->aptr].a_rate;
}
long AVI_audio_bytes(avi_t *AVI)
{
return AVI->track[AVI->aptr].audio_bytes;
}
long AVI_audio_chunks(avi_t *AVI)
{
return AVI->track[AVI->aptr].audio_chunks;
}
long AVI_audio_codech_offset(avi_t *AVI)
{
return AVI->track[AVI->aptr].a_codech_off;
}
long AVI_audio_codecf_offset(avi_t *AVI)
{
return AVI->track[AVI->aptr].a_codecf_off;
}
long AVI_video_codech_offset(avi_t *AVI)
{
return AVI->v_codech_off;
}
long AVI_video_codecf_offset(avi_t *AVI)
{
return AVI->v_codecf_off;
}
long AVI_frame_size(avi_t *AVI, long frame)
{
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->video_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
if(frame < 0 || frame >= AVI->video_frames) return 0;
return(AVI->video_index[frame].len);
}
long AVI_audio_size(avi_t *AVI, long frame)
{
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->track[AVI->aptr].audio_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
if(frame < 0 || frame >= AVI->track[AVI->aptr].audio_chunks) return 0;
return(AVI->track[AVI->aptr].audio_index[frame].len);
}
long AVI_get_video_position(avi_t *AVI, long frame)
{
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->video_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
if(frame < 0 || frame >= AVI->video_frames) return 0;
return(AVI->video_index[frame].pos);
}
int AVI_seek_start(avi_t *AVI)
{
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
lseek(AVI->fdes,AVI->movi_start,SEEK_SET);
AVI->video_pos = 0;
return 0;
}
int AVI_set_video_position(avi_t *AVI, long frame)
{
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->video_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
if (frame < 0 ) frame = 0;
AVI->video_pos = frame;
return 0;
}
int AVI_set_audio_bitrate(avi_t *AVI, long bitrate)
{
if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
AVI->track[AVI->aptr].mp3rate = bitrate;
return 0;
}
long AVI_read_frame(avi_t *AVI, char *vidbuf, int *keyframe)
{
long n;
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->video_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
if(AVI->video_pos < 0 || AVI->video_pos >= AVI->video_frames) return -1;
n = AVI->video_index[AVI->video_pos].len;
*keyframe = (AVI->video_index[AVI->video_pos].key==0x10) ? 1:0;
lseek(AVI->fdes, AVI->video_index[AVI->video_pos].pos, SEEK_SET);
if (avi_read(AVI->fdes,vidbuf,n) != n)
{
AVI_errno = AVI_ERR_READ;
return -1;
}
AVI->video_pos++;
return n;
}
int AVI_set_audio_position(avi_t *AVI, long byte)
{
long n0, n1, n;
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->track[AVI->aptr].audio_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
if(byte < 0) byte = 0;
/* Binary search in the audio chunks */
n0 = 0;
n1 = AVI->track[AVI->aptr].audio_chunks;
while(n0<n1-1)
{
n = (n0+n1)/2;
if(AVI->track[AVI->aptr].audio_index[n].tot>byte)
n1 = n;
else
n0 = n;
}
AVI->track[AVI->aptr].audio_posc = n0;
AVI->track[AVI->aptr].audio_posb = byte - AVI->track[AVI->aptr].audio_index[n0].tot;
return 0;
}
long AVI_read_audio(avi_t *AVI, char *audbuf, long bytes)
{
long nr, pos, left, todo;
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->track[AVI->aptr].audio_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
nr = 0; /* total number of bytes read */
while(bytes>0)
{
left = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].len - AVI->track[AVI->aptr].audio_posb;
if(left==0)
{
if(AVI->track[AVI->aptr].audio_posc>=AVI->track[AVI->aptr].audio_chunks-1) return nr;
AVI->track[AVI->aptr].audio_posc++;
AVI->track[AVI->aptr].audio_posb = 0;
continue;
}
if(bytes<left)
todo = bytes;
else
todo = left;
pos = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].pos + AVI->track[AVI->aptr].audio_posb;
lseek(AVI->fdes, pos, SEEK_SET);
if (avi_read(AVI->fdes,audbuf+nr,todo) != todo)
{
AVI_errno = AVI_ERR_READ;
return -1;
}
bytes -= todo;
nr += todo;
AVI->track[AVI->aptr].audio_posb += todo;
}
return nr;
}
long AVI_read_audio_chunk(avi_t *AVI, char *audbuf)
{
long pos, left;
if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
if(!AVI->track[AVI->aptr].audio_index) { AVI_errno = AVI_ERR_NO_IDX; return -1; }
if (AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].len == 0) return 0;
left = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].len - AVI->track[AVI->aptr].audio_posb;
if (audbuf == NULL) return left;
if(left==0) return 0;
pos = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].pos + AVI->track[AVI->aptr].audio_posb;
lseek(AVI->fdes, pos, SEEK_SET);
if (avi_read(AVI->fdes,audbuf,left) != left)
{
AVI_errno = AVI_ERR_READ;
return -1;
}
AVI->track[AVI->aptr].audio_posc++;
AVI->track[AVI->aptr].audio_posb = 0;
return left;
}
/* AVI_read_data: Special routine for reading the next audio or video chunk
without having an index of the file. */
int AVI_read_data(avi_t *AVI, char *vidbuf, long max_vidbuf,
char *audbuf, long max_audbuf,
long *len)
{
/*
* Return codes:
*
* 1 = video data read
* 2 = audio data read
* 0 = reached EOF
* -1 = video buffer too small
* -2 = audio buffer too small
*/
off_t n;
char data[8];
if(AVI->mode==AVI_MODE_WRITE) return 0;
while(1)
{
/* Read tag and length */
if( avi_read(AVI->fdes,data,8) != 8 ) return 0;
/* if we got a list tag, ignore it */
if(strncasecmp(data,"LIST",4) == 0)
{
lseek(AVI->fdes,4,SEEK_CUR);
continue;
}
n = PAD_EVEN(str2ulong((unsigned char *)data+4));
if(strncasecmp(data,AVI->video_tag,3) == 0)
{
*len = n;
AVI->video_pos++;
if(n>max_vidbuf)
{
lseek(AVI->fdes,n,SEEK_CUR);
return -1;
}
if(avi_read(AVI->fdes,vidbuf,n) != n ) return 0;
return 1;
}
else if(strncasecmp(data,AVI->track[AVI->aptr].audio_tag,4) == 0)
{
*len = n;
if(n>max_audbuf)
{
lseek(AVI->fdes,n,SEEK_CUR);
return -2;
}
if(avi_read(AVI->fdes,audbuf,n) != n ) return 0;
return 2;
break;
}
else
if(lseek(AVI->fdes,n,SEEK_CUR)<0) return 0;
}
}
/* AVI_print_error: Print most recent error (similar to perror) */
char *(avi_errors[]) =
{
/* 0 */ "avilib - No Error",
/* 1 */ "avilib - AVI file size limit reached",
/* 2 */ "avilib - Error opening AVI file",
/* 3 */ "avilib - Error reading from AVI file",
/* 4 */ "avilib - Error writing to AVI file",
/* 5 */ "avilib - Error writing index (file may still be useable)",
/* 6 */ "avilib - Error closing AVI file",
/* 7 */ "avilib - Operation (read/write) not permitted",
/* 8 */ "avilib - Out of memory (malloc failed)",
/* 9 */ "avilib - Not an AVI file",
/* 10 */ "avilib - AVI file has no header list (corrupted?)",
/* 11 */ "avilib - AVI file has no MOVI list (corrupted?)",
/* 12 */ "avilib - AVI file has no video data",
/* 13 */ "avilib - operation needs an index",
/* 14 */ "avilib - Unkown Error"
};
static int num_avi_errors = sizeof(avi_errors)/sizeof(char*);
static char error_string[4096];
void AVI_print_error(char *str)
{
int aerrno;
aerrno = (AVI_errno>=0 && AVI_errno<num_avi_errors) ? AVI_errno : num_avi_errors-1;
fprintf(stderr,"%s: %s\n",str,avi_errors[aerrno]);
/* for the following errors, perror should report a more detailed reason: */
if(AVI_errno == AVI_ERR_OPEN ||
AVI_errno == AVI_ERR_READ ||
AVI_errno == AVI_ERR_WRITE ||
AVI_errno == AVI_ERR_WRITE_INDEX ||
AVI_errno == AVI_ERR_CLOSE )
{
perror("REASON");
}
}
char *AVI_strerror()
{
int aerrno;
aerrno = (AVI_errno>=0 && AVI_errno<num_avi_errors) ? AVI_errno : num_avi_errors-1;
if(AVI_errno == AVI_ERR_OPEN ||
AVI_errno == AVI_ERR_READ ||
AVI_errno == AVI_ERR_WRITE ||
AVI_errno == AVI_ERR_WRITE_INDEX ||
AVI_errno == AVI_ERR_CLOSE )
{
sprintf(error_string,"%s - %s",avi_errors[aerrno],strerror(errno));
return error_string;
}
else
{
return avi_errors[aerrno];
}
}
uint64_t AVI_max_size()
{
return((uint64_t) AVI_MAX_LEN);
}
二、avilib使用方法
创建avi文件
1、AVI_open_output_file，打开avi文件
2、AVI_set_video 设置视频参数
//AVI：为打开avi文件的avi_t;width:图像宽度；height：图像高度；fps：帧率；compressor：视频压缩类型，比如"MJPG","H264"
void AVI_set_video(avi_t *AVI, int width, int height, double fps, char *compressor);
比如：
AVI_set_video(hAviHandle,704,576,25, "H264");
AVI_set_video(hAviHandle,704,576,25, "MJPG");
3、AVI_set_audio 设置音频参数
//AVI：为打开avi文件的avi_t;channels：音频通道；rate：采样率；bits：位宽；音频格式；mp3rate：mp3采样率频率，单位kbps
void AVI_set_audio(avi_t *AVI, int channels, long rate, int bits, int format, long mp3rate);
比如：
AVI_set_audio(hAviHandle, 1, 8000, 16, WAVE_FORMAT_PCM, 128);//rate*bit/(channels*1000) ?= mp3rate
4、AVI_write_frame写视频数据
5、AVI_write_audio 写音频数据
6、AVI_close 关闭avi文件
读取avi文件
1、AVI_open_input_file 打开avi文件
2、AVI_video_width、AVI_video_height、AVI_frame_rate、AVI_video_compressor视频参数获取函数；
AVI_audio_channels、AVI_audio_bits、AVI_audio_format音频获取参数等。
3、AVI_video_frames 获取所有帧数量
4、循环帧数量，读取每帧数据
int frames = AVI_video_frames(...)
int frame = 0;
char * videobuf = new char[width*height*3];
int audiobufsize = 2048*channels;
char * audiobuf = new char[audiobufsize];
for (frame = 0; frame < frames;frame++)
{
int iskeyframe;
AVI_set_video_position(avifile, frame);//将avi文件移动到第fream帧
long video_bytes = AVI_frame_size(avifile,frame);//获取视频大小
long audio_bytes = AVI_audio_size(avifile,frame);//获取音频大小
long actual_video_size = AVI_read_frame(avifile,(char *)videobuf,&iskeyframe);//读取视频帧数据
AVI_read_audio(avifile, (char *)audiobuf,audio_bytes); //读取音频帧数据
}
5、AVI_close 关闭avi文件
参考资料：
AVI文件格式，参考https://blog.csdn.net/qq_18854309/article/details/77621951?utm_source=blogxgwz0
avilib库下载 https://github.com/woshinieao/avilib