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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

 * 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 

#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;

    int inject_global_side_data;

    int avoid_negative_ts_use_pts;

};

#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);

/**

 * 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);

/**

 * 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);

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_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(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

 * at least as precise as 1/min_precision would be.

 */

AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision);

/**

 * Chooses a timebase for muxing the specified stream.

 */

enum AVChromaLocation ff_choose_chroma_location(AVFormatContext *s, AVStream *st);

/**

 * Generate standard extradata for AVC-Intra based on width/height and field

 * order.

 */

int ff_generate_avci_extradata(AVStream *st);

/**

 * Wrap errno on rename() error.

 *

 * @param oldpath source path

 * @param newpath destination path

 * @return        0 or AVERROR on failure

 */

static inline int ff_rename(const char *oldpath, const char *newpath, void *logctx)

{

    int ret = 0;

    if (rename(oldpath, newpath) == -1) {

        ret = AVERROR(errno);

        if (logctx)

            av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s\n", oldpath, newpath);

    }

    return ret;

}

/**

 * Add new side data to a stream. If a side data of this type already exists, it

 * is replaced.

 */

uint8_t *ff_stream_new_side_data(AVStream *st, enum AVPacketSideDataType type,

                                 int size);

/**

 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end

 * which is always set to 0.

 *

 * @param size size of extradata

 * @return 0 if OK, AVERROR_xxx on error

 */

int ff_alloc_extradata(AVCodecContext *avctx, int size);

/**

 * Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end

 * which is always set to 0 and fill it from pb.

 *

 * @param size size of extradata

 * @return >= 0 if OK, AVERROR_xxx on error

 */

int ff_get_extradata(AVCodecContext *avctx, AVIOContext *pb, int size);

/**

 * add frame for rfps calculation.

 *

 * @param dts timestamp of the i-th frame

 * @return 0 if OK, AVERROR_xxx on error

 */

int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);

void ff_rfps_calculate(AVFormatContext *ic);

/**

 * Flags for AVFormatContext.write_uncoded_frame()

 */

enum AVWriteUncodedFrameFlags {

    /**

     * Query whether the feature is possible on this stream.

     * The frame argument is ignored.

     */

    AV_WRITE_UNCODED_FRAME_QUERY           = 0x0001,

};

/**

 * Copies the whilelists from one context to the other

 */

int ff_copy_whitelists(AVFormatContext *dst, AVFormatContext *src);

int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,

                       const AVIOInterruptCB *int_cb, AVDictionary **options);

#endif /* AVFORMAT_INTERNAL_H */