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* 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
* 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
#include <stdint.h>
#include "avformat.h"
#define MAX_URL_SIZE 4096
#ifdef DEBUG
# define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
# define hex_dump_debug(class, buf, size)
typedef struct AVCodecTag {
enum AVCodecID id;
unsigned int tag;
} AVCodecTag;
typedef struct CodecMime{
char str[32];
enum AVCodecID id;
} CodecMime;
#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 */\
av_dynarray_add(_tab, nb_ptr, _elem);\
} while(0)
#define dynarray_add(tab, nb_ptr, elem)\
do {\
av_dynarray_add((tab), nb_ptr, (elem));\
} while(0)
struct tm *ff_brktimegm(time_t secs, struct tm *tm);
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.
* @return 0, or < 0 on error
int 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);
* 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, ...) av_printf_format(7, 8);
* 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
* @param fmt the AVFormatContext, which might contain options modifying
* the generated SDP
void ff_sdp_write_media(char *buff, int size, AVCodecContext *c,
const char *dest_addr, const char *dest_type,
int port, int ttl, AVFormatContext *fmt);
* 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(AVIOContext *bc, uint64_t val);
* Read a whole line of text from AVIOContext. 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 AVIOContext
* @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(AVIOContext *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 *avpriv_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);
* Convert a relative url into an absolute url, given a base url.
* @param buf the buffer where output absolute url is written
* @param size the size of buf
* @param base the base url, may be equal to buf.
* @param rel the new url, which is interpreted relative to base
void ff_make_absolute_url(char *buf, int size, const char *base,
const char *rel);
enum AVCodecID ff_guess_image2_codec(const char *filename);
* Convert a date string in ISO8601 format to Unix timestamp.
int64_t ff_iso8601_to_unix_time(const char *datestr);
* Perform a binary search using av_index_search_timestamp() and
* AVInputFormat.read_timestamp().
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
int64_t target_ts, int flags);
* Update cur_dts of all streams based on the given timestamp and AVStream.
* Stream ref_st unchanged, others set cur_dts in their native time base.
* Only needed for timestamp wrapping or if (dts not set and pts!=dts).
* @param timestamp new dts expressed in time_base of param ref_st
* @param ref_st reference stream giving time_base of param timestamp
void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
* Perform a binary search using read_timestamp().
* @param target_ts target timestamp in the time base of the given stream
* @param stream_index stream number
int64_t ff_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 ));
* Set the pts for a given stream. If the new values would be invalid
* (<= 0), it leaves the AVStream unchanged.
* @param s stream
* @param pts_wrap_bits number of bits effectively used by the pts
* (used for wrap control, 33 is the value for MPEG)
* @param pts_num numerator to convert to seconds (MPEG: 1)
* @param pts_den denominator to convert to seconds (MPEG: 90000)
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
unsigned int pts_num, unsigned int pts_den);
* Add side data to a packet for changing parameters to the given values.
* Parameters set to 0 aren't included in the change.
int ff_add_param_change(AVPacket *pkt, int32_t channels,
uint64_t channel_layout, int32_t sample_rate,
int32_t width, int32_t height);
* Set the timebase for each stream from the corresponding codec timebase and
* print it.
int ff_framehash_write_header(AVFormatContext *s);
* Read a transport packet from a media file.
* @param s media file handle
* @param pkt is filled
* @return 0 if OK, AVERROR_xxx on error
int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
* Interleave a packet per dts in an output media file.
* Packets with pkt->destruct == av_destruct_packet will be freed inside this
* function, so they cannot be used after it. Note that calling av_free_packet()
* on them is still safe.
* @param s media file handle
* @param out the interleaved packet will be output here
* @param pkt the input packet
* @param flush 1 if no further packets are available as input and all
* remaining packets should be output
* @return 1 if a packet was output, 0 if no packet could be output,
* < 0 if an error occurred
int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
AVPacket *pkt, int flush);
void ff_free_stream(AVFormatContext *s, AVStream *st);
* Return the frame duration in seconds. Return 0 if not available.
void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st,
AVCodecParserContext *pc, AVPacket *pkt);
int ff_get_audio_frame_size(AVCodecContext *enc, int size, int mux);
* Chooses a timebase for muxing the specified stream.
* The choosen timebase allows sample accurate timestamps based
* on the framerate or sample rate for audio streams. It also is
* at least as precisse as 1/min_precission would be.
AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precission);
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