ffmpeg.h

#ifndef _INCLUDE_FFMPEG_H_
#define _INCLUDE_FFMPEG_H_

#ifdef HAVE_FFMPEG
#include <errno.h>

#ifdef FFMPEG_NEW_INCLUDES
#include <libavformat/avformat.h>
#else
#include <avformat.h>
#endif

#ifndef AVERROR /* 0.4.8 & 0.4.9-pre1 */

#if EINVAL > 0
#define AVERROR(e) (-(e)) 
#define AVUNERROR(e) (-(e)) 
#else
/* Some platforms have E* and errno already negated. */
#define AVERROR(e) (e)
#define AVUNERROR(e) (e)
#endif

#endif /* AVERROR */

#endif /* HAVE_FFMPEG */


#include <stdio.h>
#include <stdarg.h>

/* 
 * Define a codec name/identifier for timelapse videos, so that we can
 * differentiate between normal mpeg1 videos and timelapse videos.
 */
#define TIMELAPSE_CODEC "mpeg1_tl"

struct ffmpeg {
#ifdef HAVE_FFMPEG
    AVFormatContext *oc;
    AVStream *video_st;
    AVCodecContext *c;

    AVFrame *picture;       /* contains default image pointers */
    uint8_t *video_outbuf;
    int video_outbuf_size;

    void *udata;            /* U & V planes for greyscale images */
    int vbr;                /* variable bitrate setting */
    char codec[20];         /* codec name */
#else
    int dummy;
#endif
};

/* Initialize FFmpeg stuff. Needs to be called before ffmpeg_open. */
void ffmpeg_init(void);

/*
 * Open an mpeg file. This is a generic interface for opening either an mpeg1 or
 * an mpeg4 video. If non-standard mpeg1 isn't supported (FFmpeg build > 4680), 
 * calling this function with "mpeg1" as codec results in an error. To create a
 * timelapse video, use TIMELAPSE_CODEC as codec name.
 */
struct ffmpeg *ffmpeg_open(
    char *ffmpeg_video_codec, 
    char *filename, 
    unsigned char *y,    /* YUV420 Y plane */
    unsigned char *u,    /* YUV420 U plane */
    unsigned char *v,    /* YUV420 V plane */
    int width,
    int height, 
    int rate,            /* framerate, fps */
    int bps,             /* bitrate; bits per second */
    int vbr              /* variable bitrate */
    );

/* Puts the image pointed to by the picture member of struct ffmpeg. */
int ffmpeg_put_image(struct ffmpeg *);

/* Puts the image defined by u, y and v (YUV420 format). */
int ffmpeg_put_other_image(
    struct ffmpeg *ffmpeg, 
    unsigned char *y, 
    unsigned char *u, 
    unsigned char *v
    );

/* Closes the mpeg file. */
void ffmpeg_close(struct ffmpeg *);

/* Deinterlace the image. */
void ffmpeg_deinterlace(unsigned char *, int, int);

/* Setup an avcodec log handler. */
void ffmpeg_avcodec_log(void *, int, const char *, va_list);

#endif /* _INCLUDE_FFMPEG_H_ */