avformat.h

使用stl技术,(还没看,是听说的)

#ifndef AVFORMAT_H
#define AVFORMAT_H

#ifdef __cplusplus
extern "C" {
#endif

#define LIBAVFORMAT_BUILD       4608

#define LIBAVFORMAT_VERSION_INT FFMPEG_VERSION_INT
#define LIBAVFORMAT_VERSION     FFMPEG_VERSION
#define LIBAVFORMAT_IDENT	"FFmpeg" FFMPEG_VERSION "b" AV_STRINGIFY(LIBAVFORMAT_BUILD)

#include <time.h>

#include "avcodec.h"

#include "avio.h"

/* packet functions */

#ifndef MAXINT64
#define MAXINT64 int64_t_C(0x7fffffffffffffff)
#endif

#ifndef MININT64
#define MININT64 int64_t_C(0x8000000000000000)
#endif

#define AV_NOPTS_VALUE MININT64
#define AV_TIME_BASE 1000000

typedef struct AVPacket {
    int64_t pts; /* presentation time stamp in stream units (set av_set_pts_info) */
    uint8_t *data;
    int   size;
    int   stream_index;
    int   flags;
    int   duration;
    void  (*destruct)(struct AVPacket *);
    void  *priv;
} AVPacket; 
#define PKT_FLAG_KEY   0x0001

static inline void av_init_packet(AVPacket *pkt)
{
    pkt->pts   = AV_NOPTS_VALUE;
    pkt->flags = 0;
    pkt->stream_index = 0;
}

int av_new_packet(AVPacket *pkt, int size);

/**
 * Free a packet
 *
 * @param pkt packet to free
 */
static inline void av_free_packet(AVPacket *pkt)
{
    if (pkt && pkt->destruct) {
	pkt->destruct(pkt);
    }
}

/*************************************************/
/* fractional numbers for exact pts handling */

/* the exact value of the fractional number is: 'val + num / den'. num
   is assumed to be such as 0 <= num < den */
typedef struct AVFrac {
    int64_t val, num, den; 
} AVFrac;

void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den);
void av_frac_add(AVFrac *f, int64_t incr);
void av_frac_set(AVFrac *f, int64_t val);

/*************************************************/
/* input/output formats */

struct AVFormatContext;

/* this structure contains the data a format has to probe a file */
typedef struct AVProbeData {
    const char *filename;
    unsigned char *buf;
    int buf_size;
} AVProbeData;

#define AVPROBE_SCORE_MAX 100

typedef struct AVFormatParameters {
    int frame_rate;
    int frame_rate_base;
    int sample_rate;
    int channels;
    int width;
    int height;
    enum PixelFormat pix_fmt;
    struct AVImageFormat *image_format;
    int channel; /* used to select dv channel */
    const char *device; /* video4linux, audio or DV device */
    const char *standard; /* tv standard, NTSC, PAL, SECAM */
} AVFormatParameters;

#define AVFMT_NOFILE        0x0001 /* no file should be opened */
#define AVFMT_NEEDNUMBER    0x0002 /* needs '%d' in filename */ 
#define AVFMT_NOHEADER      0x0004 /* signal that no header is present
                                      (streams are added dynamically) */
#define AVFMT_SHOW_IDS      0x0008 /* show format stream IDs numbers */
#define AVFMT_RAWPICTURE    0x0020 /* format wants AVPicture structure for
                                      raw picture data */

typedef struct AVOutputFormat {
    const char *name;
    const char *long_name;
    const char *mime_type;
    const char *extensions; /* comma separated extensions */
    /* size of private data so that it can be allocated in the wrapper */
    int priv_data_size;
    /* output support */
    enum CodecID audio_codec; /* default audio codec */
    enum CodecID video_codec; /* default video codec */
    int (*write_header)(struct AVFormatContext *);
    int (*write_packet)(struct AVFormatContext *, 
                        int stream_index,
                        const uint8_t *buf, int size, int64_t pts);
    int (*write_trailer)(struct AVFormatContext *);
    /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
    int flags;
    /* currently only used to set pixel format if not YUV420P */
    int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
    /* private fields */
    struct AVOutputFormat *next;
} AVOutputFormat;

typedef struct AVInputFormat {
    const char *name;
    const char *long_name;
    /* size of private data so that it can be allocated in the wrapper */
    int priv_data_size;
    /* tell if a given file has a chance of being parsing by this format */
    int (*read_probe)(AVProbeData *);
    /* read the format header and initialize the AVFormatContext
       structure. Return 0 if OK. 'ap' if non NULL contains
       additionnal paramters. Only used in raw format right
       now. 'av_new_stream' should be called to create new streams.  */
    int (*read_header)(struct AVFormatContext *,
                       AVFormatParameters *ap);
    /* read one packet and put it in 'pkt'. pts and flags are also
       set. 'av_new_stream' can be called only if the flag
       AVFMT_NOHEADER is used. */
    int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
    /* close the stream. The AVFormatContext and AVStreams are not
       freed by this function */
    int (*read_close)(struct AVFormatContext *);
    /* seek at or before a given pts (given in microsecond). The pts
       origin is defined by the stream */
    int (*read_seek)(struct AVFormatContext *, int64_t pts);
    /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_NOHEADER */
    int flags;
    /* if extensions are defined, then no probe is done. You should
       usually not use extension format guessing because it is not
       reliable enough */
    const char *extensions;
    /* general purpose read only value that the format can use */
    int value;
    /* private fields */
    struct AVInputFormat *next;
} AVInputFormat;

typedef struct AVStream {
    int index;    /* stream index in AVFormatContext */
    int id;       /* format specific stream id */
    AVCodecContext codec; /* codec context */
    int r_frame_rate;     /* real frame rate of the stream */
    int r_frame_rate_base;/* real frame rate base of the stream */
    void *priv_data;
    /* internal data used in av_find_stream_info() */
    int codec_info_state;     
    int codec_info_nb_repeat_frames;
    int codec_info_nb_real_frames;
    /* PTS generation when outputing stream */
    AVFrac pts;
    /* ffmpeg.c private use */
    int stream_copy; /* if TRUE, just copy stream */
    /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
     * MN:dunno if thats the right place, for it */
    float quality; 
    /* decoding: position of the first frame of the component, in
       AV_TIME_BASE fractional seconds. */
    int64_t start_time; 
    /* decoding: duration of the stream, in AV_TIME_BASE fractional
       seconds. */
    int64_t duration;
} AVStream;

#define MAX_STREAMS 20

/* format I/O context */
typedef struct AVFormatContext {
    /* can only be iformat or oformat, not both at the same time */
    struct AVInputFormat *iformat;
    struct AVOutputFormat *oformat;
    void *priv_data;
    ByteIOContext pb;
    int nb_streams;
    AVStream *streams[MAX_STREAMS];
    char filename[1024]; /* input or output filename */
    /* stream info */
    char title[512];
    char author[512];
    char copyright[512];
    char comment[512];
    char album[512];
    int year;  /* ID3 year, 0 if none */
    int track; /* track number, 0 if none */
    char genre[32]; /* ID3 genre */

    int flags; /* format specific flags */
    /* private data for pts handling (do not modify directly) */
    int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
    int pts_num, pts_den; /* value to convert to seconds */
    /* This buffer is only needed when packets were already buffered but
       not decoded, for example to get the codec parameters in mpeg
       streams */
    struct AVPacketList *packet_buffer;

    /* decoding: position of the first frame of the component, in
       AV_TIME_BASE fractional seconds. NEVER set this value directly:
       it is deduced from the AVStream values.  */
    int64_t start_time; 
    /* decoding: duration of the stream, in AV_TIME_BASE fractional
       seconds. NEVER set this value directly: it is deduced from the
       AVStream values.  */
    int64_t duration;
    /* decoding: total file size. 0 if unknown */
    int64_t file_size;
    /* decoding: total stream bitrate in bit/s, 0 if not
       available. Never set it directly if the file_size and the
       duration are known as ffmpeg can compute it automatically. */
    int bit_rate;
} AVFormatContext;

typedef struct AVPacketList {
    AVPacket pkt;
    struct AVPacketList *next;
} AVPacketList;

extern AVInputFormat *first_iformat;
extern AVOutputFormat *first_oformat;

/* still image support */
struct AVInputImageContext;
typedef struct AVInputImageContext AVInputImageContext;

typedef struct AVImageInfo {
    enum PixelFormat pix_fmt; /* requested pixel format */
    int width; /* requested width */
    int height; /* requested height */
    int interleaved; /* image is interleaved (e.g. interleaved GIF) */
    AVPicture pict; /* returned allocated image */
} AVImageInfo;

/* AVImageFormat.flags field constants */
#define AVIMAGE_INTERLEAVED 0x0001 /* image format support interleaved output */

typedef struct AVImageFormat {
    const char *name;
    const char *extensions;
    /* tell if a given file has a chance of being parsing by this format */
    int (*img_probe)(AVProbeData *);