avformat.h
上传用户:luocongwen
上传日期:2007-11-25
资源大小:1022k
文件大小:23k
- #ifndef AVFORMAT_H
- #define AVFORMAT_H
- #ifdef __cplusplus
- extern "C" {
- #endif
- #define LIBAVFORMAT_VERSION_INT ((50<<16)+(4<<8)+0)
- #define LIBAVFORMAT_VERSION 50.4.0
- #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
- #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
- #include <time.h>
- #include <stdio.h> /* FILE */
- #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
- typedef struct AVPacket {
- int64_t pts; ///< presentation time stamp in time_base units
- int64_t dts; ///< decompression time stamp in time_base units
- uint8_t *data;
- int size;
- int stream_index;
- int flags;
- int duration; ///< presentation duration in time_base units (0 if not available)
- void (*destruct)(struct AVPacket *);
- void *priv;
- int64_t pos; ///< byte position in stream, -1 if unknown
- } AVPacket;
- #define PKT_FLAG_KEY 0x0001
- void av_destruct_packet_nofree(AVPacket *pkt);
- void av_destruct_packet(AVPacket *pkt);
- /* initialize optional fields of a packet */
- static inline void av_init_packet(AVPacket *pkt)
- {
- pkt->pts = AV_NOPTS_VALUE;
- pkt->dts = AV_NOPTS_VALUE;
- pkt->pos = -1;
- pkt->duration = 0;
- pkt->flags = 0;
- pkt->stream_index = 0;
- pkt->destruct= av_destruct_packet_nofree;
- }
- int av_new_packet(AVPacket *pkt, int size);
- int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
- int av_dup_packet(AVPacket *pkt);
- /**
- * 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 {
- AVRational time_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; /* video, audio or DV device */
- const char *standard; /* tv standard, NTSC, PAL, SECAM */
- int mpeg2ts_raw:1; /* force raw MPEG2 transport stream output, if possible */
- int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
- stream packet (only meaningful if
- mpeg2ts_raw is TRUE */
- int initial_pause:1; /* do not begin to play the stream
- immediately (RTSP only) */
- enum CodecID video_codec_id;
- enum CodecID audio_codec_id;
- } AVFormatParameters;
- #define AVFMT_NOFILE 0x0001 /* no file should be opened */
- #define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
- #define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
- #define AVFMT_RAWPICTURE 0x0020 /* format wants AVPicture structure for
- raw picture data */
- #define AVFMT_GLOBALHEADER 0x0040 /* format wants global header */
- 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 *, AVPacket *pkt);
- int (*write_trailer)(struct AVFormatContext *);
- /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
- int flags;
- /* currently only used to set pixel format if not YUV420P */
- int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
- int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
- /* 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
- AVFMTCTX_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 to a given timestamp relative to the frames in
- * stream component stream_index
- * @param stream_index must not be -1
- * @param flags selects which direction should be preferred if no exact
- * match is available
- */
- int (*read_seek)(struct AVFormatContext *,
- int stream_index, int64_t timestamp, int flags);
- /**
- * gets the next timestamp in AV_TIME_BASE units.
- */
- int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
- int64_t *pos, int64_t pos_limit);
- /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
- 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;
- /* start/resume playing - only meaningful if using a network based format
- (RTSP) */
- int (*read_play)(struct AVFormatContext *);
- /* pause playing - only meaningful if using a network based format
- (RTSP) */
- int (*read_pause)(struct AVFormatContext *);
- /* private fields */
- struct AVInputFormat *next;
- } AVInputFormat;
- typedef struct AVIndexEntry {
- int64_t pos;
- int64_t timestamp;
- #define AVINDEX_KEYFRAME 0x0001
- int flags:2;
- int size:30; //yeah trying to keep the size of this small to reduce memory requirements (its 24 vs 32 byte due to possible 8byte align)
- int min_distance; /* min distance between this and the previous keyframe, used to avoid unneeded searching */
- } AVIndexEntry;
- typedef struct AVStream {
- int index; /* stream index in AVFormatContext */
- int id; /* format specific stream id */
- AVCodecContext *codec; /* codec context */
- /**
- * real base frame rate of the stream.
- * for example if the timebase is 1/90000 and all frames have either
- * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
- */
- AVRational r_frame_rate;
- void *priv_data;
- /* internal data used in av_find_stream_info() */
- int64_t codec_info_duration;
- int codec_info_nb_frames;
- /* encoding: PTS generation when outputing stream */
- AVFrac pts;
- /**
- * this is the fundamental unit of time (in seconds) in terms
- * of which frame timestamps are represented. for fixed-fps content,
- * timebase should be 1/framerate and timestamp increments should be
- * identically 1.
- */
- AVRational time_base;
- int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
- /* ffmpeg.c private use */
- int stream_copy; /* if TRUE, just copy stream */
- enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
- //FIXME move stuff to a flags field?
- /* 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;
- char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
- /* av_read_frame() support */
- int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
- struct AVCodecParserContext *parser;
- int64_t cur_dts;
- int last_IP_duration;
- int64_t last_IP_pts;
- /* av_seek_frame() support */
- AVIndexEntry *index_entries; /* only used if the format does not
- support seeking natively */
- int nb_index_entries;
- int index_entries_allocated_size;
- int64_t nb_frames; ///< number of frames in this stream if known or 0
- } 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
- } 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 *);
- /* 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;
- void av_register_image_format(AVImageFormat *img_fmt);
- AVImageFormat *av_probe_image_format(AVProbeData *pd);
- AVImageFormat *guess_image_format(const char *filename);
- 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);
- int av_write_image(ByteIOContext *pb, AVImageFormat *fmt, AVImageInfo *img);
- extern AVImageFormat *first_image_format;
- extern AVImageFormat pnm_image_format;
- extern AVImageFormat pbm_image_format;
- extern AVImageFormat pgm_image_format;
- extern AVImageFormat ppm_image_format;
- extern AVImageFormat pam_image_format;
- extern AVImageFormat pgmyuv_image_format;
- extern AVImageFormat yuv_image_format;
- #ifdef CONFIG_ZLIB
- extern AVImageFormat png_image_format;
- #endif
- extern AVImageFormat jpeg_image_format;
- extern AVImageFormat gif_image_format;
- extern AVImageFormat sgi_image_format;
- /* XXX: use automatic init with either ELF sections or C file parser */
- /* modules */
- /* mpeg.c */
- extern AVInputFormat mpegps_demux;
- int mpegps_init(void);
- /* mpegts.c */
- extern AVInputFormat mpegts_demux;
- int mpegts_init(void);
- /* rm.c */
- int rm_init(void);
- /* crc.c */
- int crc_init(void);
- /* img.c */
- int img_init(void);
- /* img2.c */
- int img2_init(void);
- /* asf.c */
- int asf_init(void);
- /* avienc.c */
- int avienc_init(void);
- /* avidec.c */
- int avidec_init(void);
- /* swf.c */
- int swf_init(void);
- /* mov.c */
- int mov_init(void);
- /* movenc.c */
- int movenc_init(void);
- /* flvenc.c */
- int flvenc_init(void);
- /* flvdec.c */
- int flvdec_init(void);
- /* jpeg.c */
- int jpeg_init(void);
- /* gif.c */
- int gif_init(void);
- /* au.c */
- int au_init(void);
- /* amr.c */
- int amr_init(void);
- /* wav.c */
- int ff_wav_init(void);
- /* mmf.c */
- int ff_mmf_init(void);
- /* raw.c */
- int pcm_read_seek(AVFormatContext *s,
- int stream_index, int64_t timestamp, int flags);
- int raw_init(void);
- /* mp3.c */
- int mp3_init(void);
- /* yuv4mpeg.c */
- int yuv4mpeg_init(void);
- /* ogg2.c */
- int ogg_init(void);
- /* ogg.c */
- int libogg_init(void);
- /* dv.c */
- int ff_dv_init(void);
- /* ffm.c */
- int ffm_init(void);
- /* rtsp.c */
- extern AVInputFormat redir_demux;
- int redir_open(AVFormatContext **ic_ptr, ByteIOContext *f);
- /* 4xm.c */
- int fourxm_init(void);
- /* psxstr.c */
- int str_init(void);
- /* idroq.c */
- int roq_init(void);
- /* ipmovie.c */
- int ipmovie_init(void);
- /* nut.c */
- int nut_init(void);
- /* wc3movie.c */
- int wc3_init(void);
- /* westwood.c */
- int westwood_init(void);
- /* segafilm.c */
- int film_init(void);
- /* idcin.c */
- int idcin_init(void);
- /* flic.c */
- int flic_init(void);
- /* sierravmd.c */
- int vmd_init(void);
- /* matroska.c */
- int matroska_init(void);
- /* sol.c */
- int sol_init(void);
- /* electronicarts.c */
- int ea_init(void);
- /* nsvdec.c */
- int nsvdec_init(void);
- /* daud.c */
- int daud_init(void);
- /* nuv.c */
- int nuv_init(void);
- /* aiff.c */
- int ff_aiff_init(void);
- /* voc.c */
- int voc_init(void);
- /* tta.c */
- int tta_init(void);
- /* adts.c */
- int ff_adts_init(void);
- /* mm.c */
- int mm_init(void);
- /* avs.c */
- int avs_init(void);
- /* smacker.c */
- int smacker_init(void);
- #include "rtp.h"
- #include "rtsp.h"
- /* yuv4mpeg.c */
- extern AVOutputFormat yuv4mpegpipe_oformat;
- /* 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);
- typedef struct FifoBuffer {
- uint8_t *buffer;
- uint8_t *rptr, *wptr, *end;
- } FifoBuffer;
- int fifo_init(FifoBuffer *f, int size);
- void fifo_free(FifoBuffer *f);
- int fifo_size(FifoBuffer *f, uint8_t *rptr);
- int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr);
- void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr);
- int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr);
- void fifo_realloc(FifoBuffer *f, unsigned int size);
- /* 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);
- /* 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_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 get_frame_filename(char *buf, int buf_size,
- const char *path, int number);
- int 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 */