/* * 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 "libavutil/bprint.h"#include "avformat.h"#include "os_support.h" #define MAX_URL_SIZE 4096 /** size of probe buffer, for guessing file type from file contents */#define PROBE_BUF_MIN 2048#define PROBE_BUF_MAX (1 << 20) #define MAX_PROBE_PACKETS 2500 #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) do { if (0) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size); } while(0)#endif typedef struct AVCodecTag {    enum AVCodecID id;    unsigned int tag;} AVCodecTag; typedef struct CodecMime{    char str[32];    enum AVCodecID id;} CodecMime; /*************************************************//* fractional numbers for exact pts handling */ /** * The exact value of the fractional number is: 'val + num / den'. * num is assumed to be 0 <= num < den. */typedef struct FFFrac {    int64_t val, num, den;} FFFrac;  struct AVFormatInternal {    /**     * Number of streams relevant for interleaving.     * Muxing only.     */    int nb_interleaved_streams;     /**     * This buffer is only needed when packets were already buffered but     * not decoded, for example to get the codec parameters in MPEG     * streams.     */    struct AVPacketList *packet_buffer;    struct AVPacketList *packet_buffer_end;     /* av_seek_frame() support */    int64_t data_offset; /**< offset of the first packet */     /**     * Raw packets from the demuxer, prior to parsing and decoding.     * This buffer is used for buffering packets until the codec can     * be identified, as parsing cannot be done without knowing the     * codec.     */    struct AVPacketList *raw_packet_buffer;    struct AVPacketList *raw_packet_buffer_end;    /**     * Packets split by the parser get queued here.     */    struct AVPacketList *parse_queue;    struct AVPacketList *parse_queue_end;    /**     * Remaining size available for raw_packet_buffer, in bytes.     */#define RAW_PACKET_BUFFER_SIZE 2500000    int raw_packet_buffer_remaining_size;     /**     * Offset to remap timestamps to be non-negative.     * Expressed in timebase units.     * @see AVStream.mux_ts_offset     */    int64_t offset;     /**     * Timebase for the timestamp offset.     */    AVRational offset_timebase; #if FF_API_COMPUTE_PKT_FIELDS2    int missing_ts_warning;#endif     int inject_global_side_data;     int avoid_negative_ts_use_pts;     /**     * Whether or not a header has already been written     */    int header_written;    int write_header_ret;     /**     * Timestamp of the end of the shortest stream.     */    int64_t shortest_end;     /**     * Whether or not avformat_init_output has already been called     */    int initialized;     /**     * Whether or not avformat_init_output fully initialized streams     */    int streams_initialized;     /**     * ID3v2 tag useful for MP3 demuxing     */    AVDictionary *id3v2_meta;     /*     * Prefer the codec framerate for avg_frame_rate computation.     */    int prefer_codec_framerate;}; struct AVStreamInternal {    /**     * Set to 1 if the codec allows reordering, so pts can be different     * from dts.     */    int reorder;     /**     * bitstream filters to run on stream     * - encoding: Set by muxer using ff_stream_add_bitstream_filter     * - decoding: unused     */    AVBSFContext **bsfcs;    int nb_bsfcs;     /**     * Whether or not check_bitstream should still be run on each packet     */    int bitstream_checked;     /**     * The codec context used by avformat_find_stream_info, the parser, etc.     */    AVCodecContext *avctx;    /**     * 1 if avctx has been initialized with the values from the codec parameters     */    int avctx_inited;     enum AVCodecID orig_codec_id;     /* the context for extracting extradata in find_stream_info()     * inited=1/bsf=NULL signals that extracting is not possible (codec not     * supported) */    struct {        AVBSFContext *bsf;        AVPacket     *pkt;        int inited;    } extract_extradata;     /**     * Whether the internal avctx needs to be updated from codecpar (after a late change to codecpar)     */    int need_context_update;}; #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); /** * 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); /** * 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 * @param interleave 0->use av_write_frame, 1->av_interleaved_write_frame * @return the value av_write_frame returned */int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,                     AVFormatContext *src, int interleave); /** * 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); void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance); /** * 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); enum AVCodecID ff_guess_image2_codec(const char *filename); /** * 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); int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos,                    int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t )); /** * 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_packet_unref() * 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(AVFormatContext *s, int *pnum, int *pden, AVStream *st,                               AVCodecParserContext *pc, AVPacket *pkt); 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 chosen timebase allows sample accurate timestamps based * on the framerate or sample rate for audio streams. It also is

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