/* * copyright (c) 2001 Fabrice Bellard * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 #ifdef DEBUG # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size) #else # define hex_dump_debug(class, buf, size) #endif typedef struct AVCodecTag { enum CodecID id; unsigned int tag; } AVCodecTag; typedef struct CodecMime{ char str[32]; enum CodecID id; } CodecMime; 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 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. */ 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); /** * 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 CodecID 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); #endif /* AVFORMAT_INTERNAL_H */