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ffmpeg/libavformat/avformat.h
Reimar Döffinger 22ffac707e Try to find out correct start time to make seeking faster and add some 
extra checks to make sure the seeking function will not hang forever.

Originally committed as revision 5814 to svn://svn.ffmpeg.org/ffmpeg/trunk
2006-07-23 18:19:33 +00:00

566 lines
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C
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#ifndef AVFORMAT_H
#define AVFORMAT_H
#ifdef __cplusplus
extern "C" {
#endif
#define LIBAVFORMAT_VERSION_INT ((50<<16)+(5<<8)+0)
#define LIBAVFORMAT_VERSION 50.5.0
#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;
/*************************************************/
/* 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
int loop_input;
} 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;
/* XXX: use automatic init with either ELF sections or C file parser */
/* modules */
#include "rtp.h"
#include "rtsp.h"
/* yuv4mpeg.c */
extern AVOutputFormat yuv4mpegpipe_muxer;
/* 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, const 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);
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_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 */
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