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Diffstat (limited to 'ffmpeg/libavformat/internal.h')
| -rw-r--r-- | ffmpeg/libavformat/internal.h | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/internal.h b/ffmpeg/libavformat/internal.h new file mode 100644 index 0000000..4d56388 --- /dev/null +++ b/ffmpeg/libavformat/internal.h @@ -0,0 +1,395 @@ +/* + * 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 + +#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 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) +#else +#define dynarray_add(tab, nb_ptr, elem)\ +do {\ + av_dynarray_add((tab), nb_ptr, (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. + * @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 st the AVStream of the media to describe + * @param idx the global stream index + * @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, AVStream *st, int idx, + 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 time base and wrapping info for a given stream. This will be used + * to interpret the stream's timestamps. If the new time base is invalid + * (numerator or denominator are non-positive), it leaves the stream + * unchanged. + * + * @param s stream + * @param pts_wrap_bits number of bits effectively used by the pts + * (used for wrap control) + * @param pts_num time base numerator + * @param pts_den time base denominator + */ +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); + +unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id); + +enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag); + +/** + * Select a PCM codec based on the given parameters. + * + * @param bps bits-per-sample + * @param flt floating-point + * @param be big-endian + * @param sflags signed flags. each bit corresponds to one byte of bit depth. + * e.g. the 1st bit indicates if 8-bit should be signed or + * unsigned, the 2nd bit indicates if 16-bit should be signed or + * unsigned, etc... This is useful for formats such as WAVE where + * only 8-bit is unsigned and all other bit depths are signed. + * @return a PCM codec id or AV_CODEC_ID_NONE + */ +enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags); + +/** + * 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); + +/** + * Generate standard extradata for AVC-Intra based on width/height and field order. + */ +void ff_generate_avci_extradata(AVStream *st); + +int ff_http_match_no_proxy(const char *no_proxy, const char *hostname); + +#endif /* AVFORMAT_INTERNAL_H */ |