avformat.h

ffmpeg full sdk v2.0 完整版

} AVStream;

#define AVFMTCTX_NOHEADER      0x0001 /* signal that no header is present
                                         (streams are added dynamically) */

#define MAX_STREAMS 20

/* format I/O context */
typedef struct AVFormatContext {
    const AVClass *av_class; /* set by av_alloc_format_context */
    /* 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 */
    int64_t timestamp;
    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 ctx_flags; /* format specific flags, see AVFMTCTX_xx */
    /* private data for pts handling (do not modify directly) */
    /* 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;

    /* av_read_frame() support */
    AVStream *cur_st;
    const uint8_t *cur_ptr;
    int cur_len;
    AVPacket cur_pkt;

    /* av_seek_frame() support */
    int64_t data_offset; /* offset of the first packet */
    int index_built;

    int mux_rate;
    int packet_size;
    int preload;
    int max_delay;

#define AVFMT_NOOUTPUTLOOP -1
#define AVFMT_INFINITEOUTPUTLOOP 0
    /* number of times to loop output in formats that support it */
    int loop_output;

    int flags;
#define AVFMT_FLAG_GENPTS       0x0001 ///< generate pts if missing even if it requires parsing future frames
#define AVFMT_FLAG_IGNIDX       0x0002 ///< ignore index

    int loop_input;
    /* decoding: size of data to probe; encoding unused */
    unsigned int probesize;
} AVFormatContext;

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

extern AVInputFormat *first_iformat;
extern AVOutputFormat *first_oformat;

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

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 attribute_deprecated;

/* 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 *);
    /* read a whole image. 'alloc_cb' is called when the image size is
       known so that the caller can allocate the image. If 'allo_cb'
       returns non zero, then the parsing is aborted. Return '0' if
       OK. */
    int (*img_read)(ByteIOContext *,
                    int (*alloc_cb)(void *, AVImageInfo *info), void *);
    /* write the image */
    int supported_pixel_formats; /* mask of supported formats for output */
    int (*img_write)(ByteIOContext *, AVImageInfo *);
    int flags;
    struct AVImageFormat *next;
} AVImageFormat attribute_deprecated;

void av_register_image_format(AVImageFormat *img_fmt) attribute_deprecated;
AVImageFormat *av_probe_image_format(AVProbeData *pd) attribute_deprecated;
AVImageFormat *guess_image_format(const char *filename) attribute_deprecated;
enum CodecID av_guess_image2_codec(const char *filename);
int av_read_image(ByteIOContext *pb, const char *filename,
                  AVImageFormat *fmt,
                  int (*alloc_cb)(void *, AVImageInfo *info), void *opaque) attribute_deprecated;
int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img) attribute_deprecated;

extern AVImageFormat *first_image_format attribute_deprecated;

/* XXX: use automatic init with either ELF sections or C file parser */
/* modules */

#include "rtp.h"

#include "rtsp.h"

/* utils.c */
void av_register_input_format(AVInputFormat *format);
void av_register_output_format(AVOutputFormat *format);
AVOutputFormat *guess_stream_format(const char *short_name,
                                    const char *filename, const char *mime_type);
AVOutputFormat *guess_format(const char *short_name,
                             const char *filename, const char *mime_type);
enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
                            const char *filename, const char *mime_type, enum CodecType type);

void av_hex_dump(FILE *f, uint8_t *buf, int size);
void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);

void av_register_all(void);

/* media file input */
AVInputFormat *av_find_input_format(const char *short_name);
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
int av_open_input_stream(AVFormatContext **ic_ptr,
                         ByteIOContext *pb, const char *filename,
                         AVInputFormat *fmt, AVFormatParameters *ap);
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
                       AVInputFormat *fmt,
                       int buf_size,
                       AVFormatParameters *ap);
/* no av_open for output, so applications will need this: */
AVFormatContext *av_alloc_format_context(void);

#define AVERROR_UNKNOWN     (-1)  /* unknown error */
#define AVERROR_IO          (-2)  /* i/o error */
#define AVERROR_NUMEXPECTED (-3)  /* number syntax expected in filename */
#define AVERROR_INVALIDDATA (-4)  /* invalid data found */
#define AVERROR_NOMEM       (-5)  /* not enough memory */
#define AVERROR_NOFMT       (-6)  /* unknown format */
#define AVERROR_NOTSUPP     (-7)  /* operation not supported */

int av_find_stream_info(AVFormatContext *ic);
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
int av_read_frame(AVFormatContext *s, AVPacket *pkt);
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
int av_read_play(AVFormatContext *s);
int av_read_pause(AVFormatContext *s);
void av_close_input_file(AVFormatContext *s);
AVStream *av_new_stream(AVFormatContext *s, int id);
void av_set_pts_info(AVStream *s, int pts_wrap_bits,
                     int pts_num, int pts_den);

#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
#define AVSEEK_FLAG_BYTE     2 ///< seeking based on position in bytes
#define AVSEEK_FLAG_ANY      4 ///< seek to any frame, even non keyframes

int av_find_default_stream_index(AVFormatContext *s);
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
int av_add_index_entry(AVStream *st,
                       int64_t pos, int64_t timestamp, int size, int distance, int flags);
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);

/* media file output */
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
int av_write_header(AVFormatContext *s);
int av_write_frame(AVFormatContext *s, AVPacket *pkt);
int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);

int av_write_trailer(AVFormatContext *s);

void dump_format(AVFormatContext *ic,
                 int index,
                 const char *url,
                 int is_output);
int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
int64_t parse_date(const char *datestr, int duration);

int64_t av_gettime(void);

/* ffm specific for ffserver */
#define FFM_PACKET_SIZE 4096
offset_t ffm_read_write_index(int fd);
void ffm_write_write_index(int fd, offset_t pos);
void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);

int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);

int av_get_frame_filename(char *buf, int buf_size,
                          const char *path, int number);
int av_filename_number_test(const char *filename);

/* grab specific */
int video_grab_init(void);
int audio_init(void);

/* DV1394 */
int dv1394_init(void);
int dc1394_init(void);

#ifdef HAVE_AV_CONFIG_H

#include "os_support.h"

int strstart(const char *str, const char *val, const char **ptr);
int stristart(const char *str, const char *val, const char **ptr);
void pstrcpy(char *buf, int buf_size, const char *str);
char *pstrcat(char *buf, int buf_size, const char *s);

void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);

#ifdef __GNUC__
#define dynarray_add(tab, nb_ptr, elem)\
do {\
    typeof(tab) _tab = (tab);\
    typeof(elem) _elem = (elem);\
    (void)sizeof(**_tab == _elem); /* check that types are compatible */\
    __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
} while(0)
#else
#define dynarray_add(tab, nb_ptr, elem)\
do {\
    __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
} while(0)
#endif

time_t mktimegm(struct tm *tm);
struct tm *brktimegm(time_t secs, struct tm *tm);
const char *small_strptime(const char *p, const char *fmt,
                           struct tm *dt);

struct in_addr;
int resolve_host(struct in_addr *sin_addr, const char *hostname);

void url_split(char *proto, int proto_size,
               char *authorization, int authorization_size,
               char *hostname, int hostname_size,
               int *port_ptr,
               char *path, int path_size,
               const char *url);

int match_ext(const char *filename, const char *extensions);

#endif /* HAVE_AV_CONFIG_H */

#ifdef __cplusplus
}
#endif

#endif /* AVFORMAT_H */