mirror of
https://github.com/FFmpeg/FFmpeg.git
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3fd79833e2
Signed-off-by: Paul B Mahol <onemda@gmail.com>
374 lines
13 KiB
C
374 lines
13 KiB
C
/*
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* copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_INTERNAL_H
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#define AVFORMAT_INTERNAL_H
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#include <stdint.h>
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#include "avformat.h"
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#define MAX_URL_SIZE 4096
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/** size of probe buffer, for guessing file type from file contents */
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#define PROBE_BUF_MIN 2048
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#define PROBE_BUF_MAX (1<<20)
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#ifdef DEBUG
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# define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size)
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#else
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# define hex_dump_debug(class, buf, size)
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#endif
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typedef struct AVCodecTag {
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enum AVCodecID id;
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unsigned int tag;
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} AVCodecTag;
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typedef struct CodecMime{
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char str[32];
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enum AVCodecID id;
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} CodecMime;
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#ifdef __GNUC__
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#define dynarray_add(tab, nb_ptr, elem)\
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do {\
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__typeof__(tab) _tab = (tab);\
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__typeof__(elem) _elem = (elem);\
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(void)sizeof(**_tab == _elem); /* check that types are compatible */\
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av_dynarray_add(_tab, nb_ptr, _elem);\
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} while(0)
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#else
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#define dynarray_add(tab, nb_ptr, elem)\
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do {\
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av_dynarray_add((tab), nb_ptr, (elem));\
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} while(0)
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#endif
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struct tm *ff_brktimegm(time_t secs, struct tm *tm);
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char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase);
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/**
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* Parse a string of hexadecimal strings. Any space between the hexadecimal
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* digits is ignored.
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*
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* @param data if non-null, the parsed data is written to this pointer
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* @param p the string to parse
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* @return the number of bytes written (or to be written, if data is null)
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*/
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int ff_hex_to_data(uint8_t *data, const char *p);
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void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
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/**
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* Add packet to AVFormatContext->packet_buffer list, determining its
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* interleaved position using compare() function argument.
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* @return 0, or < 0 on error
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*/
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int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
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int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
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void ff_read_frame_flush(AVFormatContext *s);
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#define NTP_OFFSET 2208988800ULL
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#define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL)
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/** Get the current time since NTP epoch in microseconds. */
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uint64_t ff_ntp_time(void);
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/**
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* Append the media-specific SDP fragment for the media stream c
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* to the buffer buff.
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*
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* Note, the buffer needs to be initialized, since it is appended to
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* existing content.
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*
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* @param buff the buffer to append the SDP fragment to
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* @param size the size of the buff buffer
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* @param st the AVStream of the media to describe
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* @param idx the global stream index
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* @param dest_addr the destination address of the media stream, may be NULL
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* @param dest_type the destination address type, may be NULL
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* @param port the destination port of the media stream, 0 if unknown
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* @param ttl the time to live of the stream, 0 if not multicast
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* @param fmt the AVFormatContext, which might contain options modifying
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* the generated SDP
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*/
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void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx,
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const char *dest_addr, const char *dest_type,
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int port, int ttl, AVFormatContext *fmt);
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/**
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* Write a packet to another muxer than the one the user originally
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* intended. Useful when chaining muxers, where one muxer internally
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* writes a received packet to another muxer.
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*
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* @param dst the muxer to write the packet to
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* @param dst_stream the stream index within dst to write the packet to
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* @param pkt the packet to be written
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* @param src the muxer the packet originally was intended for
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* @return the value av_write_frame returned
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*/
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int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
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AVFormatContext *src);
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/**
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* Get the length in bytes which is needed to store val as v.
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*/
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int ff_get_v_length(uint64_t val);
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/**
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* Put val using a variable number of bytes.
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*/
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void ff_put_v(AVIOContext *bc, uint64_t val);
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/**
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* Read a whole line of text from AVIOContext. Stop reading after reaching
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* either a \\n, a \\0 or EOF. The returned string is always \\0-terminated,
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* and may be truncated if the buffer is too small.
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*
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* @param s the read-only AVIOContext
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* @param buf buffer to store the read line
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* @param maxlen size of the buffer
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* @return the length of the string written in the buffer, not including the
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* final \\0
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*/
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int ff_get_line(AVIOContext *s, char *buf, int maxlen);
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#define SPACE_CHARS " \t\r\n"
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/**
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* Callback function type for ff_parse_key_value.
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*
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* @param key a pointer to the key
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* @param key_len the number of bytes that belong to the key, including the '='
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* char
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* @param dest return the destination pointer for the value in *dest, may
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* be null to ignore the value
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* @param dest_len the length of the *dest buffer
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*/
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typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
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int key_len, char **dest, int *dest_len);
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/**
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* Parse a string with comma-separated key=value pairs. The value strings
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* may be quoted and may contain escaped characters within quoted strings.
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*
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* @param str the string to parse
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* @param callback_get_buf function that returns where to store the
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* unescaped value string.
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* @param context the opaque context pointer to pass to callback_get_buf
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*/
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void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
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void *context);
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/**
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* Find stream index based on format-specific stream ID
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* @return stream index, or < 0 on error
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*/
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int ff_find_stream_index(AVFormatContext *s, int id);
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/**
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* Internal version of av_index_search_timestamp
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*/
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int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
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int64_t wanted_timestamp, int flags);
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/**
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* Internal version of av_add_index_entry
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*/
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int ff_add_index_entry(AVIndexEntry **index_entries,
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int *nb_index_entries,
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unsigned int *index_entries_allocated_size,
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int64_t pos, int64_t timestamp, int size, int distance, int flags);
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/**
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* Add a new chapter.
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*
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* @param s media file handle
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* @param id unique ID for this chapter
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* @param start chapter start time in time_base units
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* @param end chapter end time in time_base units
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* @param title chapter title
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*
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* @return AVChapter or NULL on error
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*/
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AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
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int64_t start, int64_t end, const char *title);
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/**
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* Ensure the index uses less memory than the maximum specified in
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* AVFormatContext.max_index_size by discarding entries if it grows
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* too large.
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*/
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void ff_reduce_index(AVFormatContext *s, int stream_index);
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enum AVCodecID ff_guess_image2_codec(const char *filename);
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/**
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* Convert a date string in ISO8601 format to Unix timestamp.
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*/
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int64_t ff_iso8601_to_unix_time(const char *datestr);
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/**
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* Perform a binary search using av_index_search_timestamp() and
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* AVInputFormat.read_timestamp().
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*
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* @param target_ts target timestamp in the time base of the given stream
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* @param stream_index stream number
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*/
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int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
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int64_t target_ts, int flags);
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/**
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* Update cur_dts of all streams based on the given timestamp and AVStream.
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*
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* Stream ref_st unchanged, others set cur_dts in their native time base.
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* Only needed for timestamp wrapping or if (dts not set and pts!=dts).
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* @param timestamp new dts expressed in time_base of param ref_st
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* @param ref_st reference stream giving time_base of param timestamp
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*/
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void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,
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int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
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/**
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* Perform a binary search using read_timestamp().
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*
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* @param target_ts target timestamp in the time base of the given stream
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* @param stream_index stream number
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*/
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int64_t ff_gen_search(AVFormatContext *s, int stream_index,
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int64_t target_ts, int64_t pos_min,
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int64_t pos_max, int64_t pos_limit,
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int64_t ts_min, int64_t ts_max,
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int flags, int64_t *ts_ret,
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int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
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/**
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* Set the time base and wrapping info for a given stream. This will be used
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* to interpret the stream's timestamps. If the new time base is invalid
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* (numerator or denominator are non-positive), it leaves the stream
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* unchanged.
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*
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* @param s stream
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* @param pts_wrap_bits number of bits effectively used by the pts
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* (used for wrap control)
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* @param pts_num time base numerator
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* @param pts_den time base denominator
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*/
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void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
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unsigned int pts_num, unsigned int pts_den);
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/**
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* Add side data to a packet for changing parameters to the given values.
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* Parameters set to 0 aren't included in the change.
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*/
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int ff_add_param_change(AVPacket *pkt, int32_t channels,
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uint64_t channel_layout, int32_t sample_rate,
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int32_t width, int32_t height);
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/**
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* Set the timebase for each stream from the corresponding codec timebase and
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* print it.
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*/
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int ff_framehash_write_header(AVFormatContext *s);
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/**
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* Read a transport packet from a media file.
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*
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* @param s media file handle
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* @param pkt is filled
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* @return 0 if OK, AVERROR_xxx on error
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*/
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int ff_read_packet(AVFormatContext *s, AVPacket *pkt);
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/**
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* Interleave a packet per dts in an output media file.
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*
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* Packets with pkt->destruct == av_destruct_packet will be freed inside this
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* function, so they cannot be used after it. Note that calling av_free_packet()
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* on them is still safe.
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*
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* @param s media file handle
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* @param out the interleaved packet will be output here
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* @param pkt the input packet
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* @param flush 1 if no further packets are available as input and all
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* remaining packets should be output
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* @return 1 if a packet was output, 0 if no packet could be output,
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* < 0 if an error occurred
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*/
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int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
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AVPacket *pkt, int flush);
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void ff_free_stream(AVFormatContext *s, AVStream *st);
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/**
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* Return the frame duration in seconds. Return 0 if not available.
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*/
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void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st,
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AVCodecParserContext *pc, AVPacket *pkt);
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int ff_get_audio_frame_size(AVCodecContext *enc, int size, int mux);
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unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id);
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enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag);
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/**
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* Select a PCM codec based on the given parameters.
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*
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* @param bps bits-per-sample
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* @param flt floating-point
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* @param be big-endian
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* @param sflags signed flags. each bit corresponds to one byte of bit depth.
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* e.g. the 1st bit indicates if 8-bit should be signed or
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* unsigned, the 2nd bit indicates if 16-bit should be signed or
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* unsigned, etc... This is useful for formats such as WAVE where
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* only 8-bit is unsigned and all other bit depths are signed.
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* @return a PCM codec id or AV_CODEC_ID_NONE
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*/
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enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);
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/**
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* Chooses a timebase for muxing the specified stream.
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*
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* The choosen timebase allows sample accurate timestamps based
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* on the framerate or sample rate for audio streams. It also is
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* at least as precisse as 1/min_precission would be.
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*/
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AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precission);
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/**
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* Generate standard extradata for AVC-Intra based on width/height and field order.
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*/
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void ff_generate_avci_extradata(AVStream *st);
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/**
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* Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end
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* which is always set to 0.
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*
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* @param size size of extradata
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* @return 0 if OK, AVERROR_xxx on error
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*/
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int ff_alloc_extradata(AVCodecContext *avctx, int size);
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#endif /* AVFORMAT_INTERNAL_H */
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