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_INTERNAL_H

#define AVFORMAT_INTERNAL_H

#include <stdint.h>

#include "avformat.h"

#define MAX_URL_SIZE 4096

typedef struct AVCodecTag {

    enum CodecID id;

    unsigned int tag;

} AVCodecTag;

void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t 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 */\

    ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\

} while(0)

#else

#define dynarray_add(tab, nb_ptr, elem)\

do {\

    ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(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);

char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);

/**

 * Parse a string of hexadecimal strings. Any space between the hexadecimal

 * digits is ignored.

 *

 * @param data if non-null, the parsed data is written to this pointer

 * @param p the string to parse

 * @return the number of bytes written (or to be written, if data is null)

 */

int ff_hex_to_data(uint8_t *data, const char *p);

void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);

/**

 * Add packet to AVFormatContext->packet_buffer list, determining its

 * interleaved position using compare() function argument.

 */

void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,

                              int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));

void ff_read_frame_flush(AVFormatContext *s);

#define NTP_OFFSET 2208988800ULL

#define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)

/** Get the current time since NTP epoch in microseconds. */

uint64_t ff_ntp_time(void);

/**

 * Probe a bytestream to determine the input format. Each time a probe returns

 * with a score that is too low, the probe buffer size is increased and another

 * attempt is made. When the maximum probe size is reached, the input format

 * with the highest score is returned.

 *

 * @param pb the bytestream to probe

 * @param fmt the input format is put here

 * @param filename the filename of the stream

 * @param logctx the log context

 * @param offset the offset within the bytestream to probe from

 * @param max_probe_size the maximum probe buffer size (zero for default)

 * @return 0 in case of success, a negative value corresponding to an

 * AVERROR code otherwise

 */

int ff_probe_input_buffer(ByteIOContext *pb, AVInputFormat **fmt,

                          const char *filename, void *logctx,

                          unsigned int offset, unsigned int max_probe_size);

#if FF_API_URL_SPLIT

/**

 * @deprecated use av_url_split() instead

 */

void ff_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);

#endif

/**

 * Assemble a URL string from components. This is the reverse operation

 * of av_url_split.

 *

 * Note, this requires networking to be initialized, so the caller must

 * ensure ff_network_init has been called.

 *

 * @see av_url_split

 *

 * @param str the buffer to fill with the url

 * @param size the size of the str buffer

 * @param proto the protocol identifier, if null, the separator

 *              after the identifier is left out, too

 * @param authorization an optional authorization string, may be null.

 *                      An empty string is treated the same as a null string.

 * @param hostname the host name string

 * @param port the port number, left out from the string if negative

 * @param fmt a generic format string for everything to add after the

 *            host/port, may be null

 * @return the number of characters written to the destination buffer

 */

int ff_url_join(char *str, int size, const char *proto,

                const char *authorization, const char *hostname,

                int port, const char *fmt, ...);

/**

 * Append the media-specific SDP fragment for the media stream c

 * to the buffer buff.

 *

 * Note, the buffer needs to be initialized, since it is appended to

 * existing content.

 *

 * @param buff the buffer to append the SDP fragment to

 * @param size the size of the buff buffer

 * @param c the AVCodecContext of the media to describe

 * @param dest_addr the destination address of the media stream, may be NULL

 * @param dest_type the destination address type, may be NULL

 * @param port the destination port of the media stream, 0 if unknown

 * @param ttl the time to live of the stream, 0 if not multicast

 */

void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,

                        const char *dest_addr, const char *dest_type,

                        int port, int ttl);

/**

 * Write a packet to another muxer than the one the user originally

 * intended. Useful when chaining muxers, where one muxer internally

 * writes a received packet to another muxer.

 *

 * @param dst the muxer to write the packet to

 * @param dst_stream the stream index within dst to write the packet to

 * @param pkt the packet to be written

 * @param src the muxer the packet originally was intended for

 * @return the value av_write_frame returned

 */

int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,

                     AVFormatContext *src);

/**

 * Get the length in bytes which is needed to store val as v.

 */

int ff_get_v_length(uint64_t val);

/**

 * Put val using a variable number of bytes.

 */

void ff_put_v(ByteIOContext *bc, uint64_t val);

/**

 * Read a whole line of text from ByteIOContext. Stop reading after reaching

 * either a \n, a \0 or EOF. The returned string is always \0 terminated,

 * and may be truncated if the buffer is too small.

 *

 * @param s the read-only ByteIOContext

 * @param buf buffer to store the read line

 * @param maxlen size of the buffer

 * @return the length of the string written in the buffer, not including the

 *         final \0

 */

int ff_get_line(ByteIOContext *s, char *buf, int maxlen);

#define SPACE_CHARS " \t\r\n"

/**

 * Callback function type for ff_parse_key_value.

 *

 * @param key a pointer to the key

 * @param key_len the number of bytes that belong to the key, including the '='

 *                char

 * @param dest return the destination pointer for the value in *dest, may

 *             be null to ignore the value

 * @param dest_len the length of the *dest buffer

 */

typedef void (*ff_parse_key_val_cb)(void *context, const char *key,

                                    int key_len, char **dest, int *dest_len);

/**

 * Parse a string with comma-separated key=value pairs. The value strings

 * may be quoted and may contain escaped characters within quoted strings.

 *

 * @param str the string to parse

 * @param callback_get_buf function that returns where to store the

 *                         unescaped value string.

 * @param context the opaque context pointer to pass to callback_get_buf

 */

void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,

                        void *context);

/**

 * Find stream index based on format-specific stream ID

 * @return stream index, or < 0 on error

 */

int ff_find_stream_index(AVFormatContext *s, int id);

/**

 * Internal version of av_index_search_timestamp

 */

int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,

                              int64_t wanted_timestamp, int flags);

/**

 * Internal version of av_add_index_entry

 */

int ff_add_index_entry(AVIndexEntry **index_entries,

                       int *nb_index_entries,

                       unsigned int *index_entries_allocated_size,

                       int64_t pos, int64_t timestamp, int size, int distance, int flags);

/**

 * Add a new chapter.

 *

 * @param s media file handle

 * @param id unique ID for this chapter

 * @param start chapter start time in time_base units

 * @param end chapter end time in time_base units

 * @param title chapter title

 *

 * @return AVChapter or NULL on error

 */

AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,

                          int64_t start, int64_t end, const char *title);

/**

 * Ensure the index uses less memory than the maximum specified in

 * AVFormatContext.max_index_size by discarding entries if it grows

 * too large.

 */

void ff_reduce_index(AVFormatContext *s, int stream_index);

#endif /* AVFORMAT_INTERNAL_H */