PeerStreamer

/*

 * copyright (c) 2001 Fabrice Bellard

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#ifndef AVFORMAT_H

#define AVFORMAT_H

#ifdef __cplusplus

extern "C" {

#endif

#define LIBAVFORMAT_VERSION_INT ((51<<16)+(8<<8)+0)

#define LIBAVFORMAT_VERSION     51.8.0

#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 */

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 attribute_deprecated;

/*************************************************/

/* input/output formats */

struct AVCodecTag;

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               ///< max score, half of that is used for file extension based detection

typedef struct AVFormatParameters {

    AVRational time_base;

    int sample_rate;

    int channels;

    int width;

    int height;

    enum PixelFormat pix_fmt;

    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) */

    int prealloced_context:1;

    enum CodecID video_codec_id;

    enum CodecID audio_codec_id;

} AVFormatParameters;

//! demuxer will use url_fopen, no opened file should be provided by the caller

#define AVFMT_NOFILE        0x0001

#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 */

#define AVFMT_NOTIMESTAMPS  0x0080 /* format doesnt need / has any timestamps */

#define AVFMT_GENERIC_INDEX 0x0100 /* use generic index building code */

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);

    /**

     * list of supported codec_id-codec_tag pairs, ordered by "better choice first"

     * the arrays are all CODEC_ID_NONE terminated

     */

    const struct AVCodecTag **codec_tag;

    /* 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 *);

    const struct AVCodecTag **codec_tag;

    /* 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.

     * this is the lowest framerate with which all timestamps can be

     * represented accurately (its the least common multiple of all

     * framerates in the stream), Note, this value is just a guess!

     * 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;

    unsigned int index_entries_allocated_size;

    int64_t nb_frames;                 ///< number of frames in this stream if known or 0

#define MAX_REORDER_DELAY 4

    int64_t pts_buffer[MAX_REORDER_DELAY+1];

} 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;

    unsigned 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;

    /**

     * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()

     */

    int max_analyze_duration;

} AVFormatContext;

typedef struct AVPacketList {

    AVPacket pkt;

    struct AVPacketList *next;

} AVPacketList;

extern AVInputFormat *first_iformat;

extern AVOutputFormat *first_oformat;

enum CodecID av_guess_image2_codec(const char *filename);

/* 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);

/* codec tag <-> codec id */

enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);

unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);

/* 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);

int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));

/* 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 */