internal.h

/*
 * 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

#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 */

typedef struct FFFrac {
    int64_t val, num, den;
} FFFrac;


struct AVFormatInternal {
    int nb_interleaved_streams;

    struct AVPacketList *packet_buffer;
    struct AVPacketList *packet_buffer_end;

    /* av_seek_frame() support */
    int64_t data_offset; 
    struct AVPacketList *raw_packet_buffer;
    struct AVPacketList *raw_packet_buffer_end;
    struct AVPacketList *parse_queue;
    struct AVPacketList *parse_queue_end;
#define RAW_PACKET_BUFFER_SIZE 2500000
    int raw_packet_buffer_remaining_size;

    int64_t 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;

    int64_t shortest_end;

    int initialized;

    int streams_initialized;

    AVDictionary *id3v2_meta;

    /*
     * Prefer the codec framerate for avg_frame_rate computation.
     */
    int prefer_codec_framerate;
};

struct AVStreamInternal {
    int reorder;

    AVBSFContext **bsfcs;
    int nb_bsfcs;

    int bitstream_checked;

    AVCodecContext *avctx;
    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;

    int need_context_update;

    FFFrac *priv_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);

int ff_hex_to_data(uint8_t *data, const char *p);

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)

uint64_t ff_ntp_time(void);

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);

int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt,
                     AVFormatContext *src, int interleave);

int ff_get_v_length(uint64_t val);

void ff_put_v(AVIOContext *bc, uint64_t val);

int ff_get_line(AVIOContext *s, char *buf, int maxlen);

int ff_get_chomp_line(AVIOContext *s, char *buf, int maxlen);

int64_t ff_read_line_to_bprint(AVIOContext *s, AVBPrint *bp);

int64_t ff_read_line_to_bprint_overwrite(AVIOContext *s, AVBPrint *bp);

#define SPACE_CHARS " \t\r\n"

typedef void (*ff_parse_key_val_cb)(void *context, const char *key,
                                    int key_len, char **dest, int *dest_len);
void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf,
                        void *context);

int ff_find_stream_index(AVFormatContext *s, int id);

int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries,
                              int64_t wanted_timestamp, int flags);

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);

AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
                              int64_t start, int64_t end, const char *title);

void ff_reduce_index(AVFormatContext *s, int stream_index);

enum AVCodecID ff_guess_image2_codec(const char *filename);

int ff_seek_frame_binary(AVFormatContext *s, int stream_index,
                         int64_t target_ts, int flags);

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 ));

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 ));

void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits,
                         unsigned int pts_num, unsigned int pts_den);

int ff_add_param_change(AVPacket *pkt, int32_t channels,
                        uint64_t channel_layout, int32_t sample_rate,
                        int32_t width, int32_t height);

int ff_framehash_write_header(AVFormatContext *s);

int ff_read_packet(AVFormatContext *s, AVPacket *pkt);

int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
                                 AVPacket *pkt, int flush);

void ff_free_stream(AVFormatContext *s, AVStream *st);

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);

enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags);

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

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

int ff_generate_avci_extradata(AVStream *st);

int ff_stream_add_bitstream_filter(AVStream *st, const char *name, const char *args);

int ff_stream_encode_params_copy(AVStream *dst, const AVStream *src);

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) {
            char err[AV_ERROR_MAX_STRING_SIZE] = {0};
            av_make_error_string(err, AV_ERROR_MAX_STRING_SIZE, ret);
            av_log(logctx, AV_LOG_ERROR, "failed to rename file %s to %s: %s\n", oldpath, newpath, err);
        }
    }
    return ret;
}

int ff_alloc_extradata(AVCodecParameters *par, int size);

int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size);

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

void ff_rfps_calculate(AVFormatContext *ic);

enum AVWriteUncodedFrameFlags {

    AV_WRITE_UNCODED_FRAME_QUERY           = 0x0001,

};

int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src);

int ffio_open2_wrapper(struct AVFormatContext *s, AVIOContext **pb, const char *url, int flags,
                       const AVIOInterruptCB *int_cb, AVDictionary **options);

#define FFERROR_REDO FFERRTAG('R','E','D','O')

int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);

/*
 * A wrapper around AVFormatContext.io_close that should be used
 * instead of calling the pointer directly.
 */
void ff_format_io_close(AVFormatContext *s, AVIOContext **pb);

int ff_is_http_proto(char *filename);

int ff_parse_creation_time_metadata(AVFormatContext *s, int64_t *timestamp, int return_seconds);

int ff_standardize_creation_time(AVFormatContext *s);

#define CONTAINS_PAL 2

int ff_reshuffle_raw_rgb(AVFormatContext *s, AVPacket **ppkt, AVCodecParameters *par, int expected_stride);

int ff_get_packet_palette(AVFormatContext *s, AVPacket *pkt, int ret, uint32_t *palette);

int ff_bprint_to_codecpar_extradata(AVCodecParameters *par, struct AVBPrint *buf);

int ff_interleaved_peek(AVFormatContext *s, int stream,
                        AVPacket *pkt, int add_offset);


int ff_lock_avformat(void);
int ff_unlock_avformat(void);

void ff_format_set_url(AVFormatContext *s, char *url);

#define FF_PACKETLIST_FLAG_REF_PACKET (1 << 0) 
int ff_packet_list_put(AVPacketList **head, AVPacketList **tail,
                       AVPacket *pkt, int flags);

int ff_packet_list_get(AVPacketList **head, AVPacketList **tail,
                       AVPacket *pkt);

void ff_packet_list_free(AVPacketList **head, AVPacketList **tail);

void avpriv_register_devices(const AVOutputFormat * const o[], const AVInputFormat * const i[]);

#endif /* AVFORMAT_INTERNAL_H */