libavformat/avio.h

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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_AVIO_H
#define AVFORMAT_AVIO_H

#include <stdint.h>

#include "libavutil/common.h"
#include "libavutil/log.h"

#include "libavformat/version.h"

/* unbuffered I/O */

typedef struct URLContext {
#if FF_API_URL_CLASS
    const AVClass *av_class; 
#endif
    struct URLProtocol *prot;
    int flags;
    int is_streamed;  
    int max_packet_size;  
    void *priv_data;
    char *filename; 
    int is_connected;
} URLContext;

typedef struct URLPollEntry {
    URLContext *handle;
    int events;
    int revents;
} URLPollEntry;

#define URL_RDONLY 0  
#define URL_WRONLY 1  
#define URL_RDWR   2  
#define URL_FLAG_NONBLOCK 4

typedef int URLInterruptCB(void);

int url_open_protocol (URLContext **puc, struct URLProtocol *up,
                       const char *url, int flags);

int url_alloc(URLContext **h, const char *url, int flags);

int url_connect(URLContext *h);

int url_open(URLContext **h, const char *url, int flags);

int url_read(URLContext *h, unsigned char *buf, int size);

int url_read_complete(URLContext *h, unsigned char *buf, int size);

int url_write(URLContext *h, const unsigned char *buf, int size);

#define AVSEEK_SIZE 0x10000

int64_t url_seek(URLContext *h, int64_t pos, int whence);

int url_close(URLContext *h);

int url_exist(const char *url);

int64_t url_filesize(URLContext *h);

int url_get_file_handle(URLContext *h);

int url_get_max_packet_size(URLContext *h);

void url_get_filename(URLContext *h, char *buf, int buf_size);

void url_set_interrupt_cb(URLInterruptCB *interrupt_cb);

/* not implemented */
int url_poll(URLPollEntry *poll_table, int n, int timeout);

int av_url_read_pause(URLContext *h, int pause);

int64_t av_url_read_seek(URLContext *h, int stream_index,
                         int64_t timestamp, int flags);

#define AVSEEK_FORCE 0x20000

#define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */

typedef struct URLProtocol {
    const char *name;
    int (*url_open)(URLContext *h, const char *url, int flags);
    int (*url_read)(URLContext *h, unsigned char *buf, int size);
    int (*url_write)(URLContext *h, const unsigned char *buf, int size);
    int64_t (*url_seek)(URLContext *h, int64_t pos, int whence);
    int (*url_close)(URLContext *h);
    struct URLProtocol *next;
    int (*url_read_pause)(URLContext *h, int pause);
    int64_t (*url_read_seek)(URLContext *h, int stream_index,
                             int64_t timestamp, int flags);
    int (*url_get_file_handle)(URLContext *h);
    int priv_data_size;
    const AVClass *priv_data_class;
    int flags;
} URLProtocol;

#if FF_API_REGISTER_PROTOCOL
extern URLProtocol *first_protocol;
#endif

extern URLInterruptCB *url_interrupt_cb;

URLProtocol *av_protocol_next(URLProtocol *p);

#if FF_API_REGISTER_PROTOCOL

attribute_deprecated int register_protocol(URLProtocol *protocol);

attribute_deprecated int av_register_protocol(URLProtocol *protocol);
#endif

int av_register_protocol2(URLProtocol *protocol, int size);

typedef struct {
    unsigned char *buffer;
    int buffer_size;
    unsigned char *buf_ptr, *buf_end;
    void *opaque;
    int (*read_packet)(void *opaque, uint8_t *buf, int buf_size);
    int (*write_packet)(void *opaque, uint8_t *buf, int buf_size);
    int64_t (*seek)(void *opaque, int64_t offset, int whence);
    int64_t pos; 
    int must_flush; 
    int eof_reached; 
    int write_flag;  
    int is_streamed;
    int max_packet_size;
    unsigned long checksum;
    unsigned char *checksum_ptr;
    unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size);
    int error;         
    int (*read_pause)(void *opaque, int pause);
    int64_t (*read_seek)(void *opaque, int stream_index,
                         int64_t timestamp, int flags);
} AVIOContext;

#if FF_API_OLD_AVIO
typedef attribute_deprecated AVIOContext ByteIOContext;

attribute_deprecated int init_put_byte(AVIOContext *s,
                  unsigned char *buffer,
                  int buffer_size,
                  int write_flag,
                  void *opaque,
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
                  int64_t (*seek)(void *opaque, int64_t offset, int whence));
attribute_deprecated AVIOContext *av_alloc_put_byte(
                  unsigned char *buffer,
                  int buffer_size,
                  int write_flag,
                  void *opaque,
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
                  int64_t (*seek)(void *opaque, int64_t offset, int whence));

attribute_deprecated int          get_buffer(AVIOContext *s, unsigned char *buf, int size);
attribute_deprecated int          get_partial_buffer(AVIOContext *s, unsigned char *buf, int size);
attribute_deprecated int          get_byte(AVIOContext *s);
attribute_deprecated unsigned int get_le16(AVIOContext *s);
attribute_deprecated unsigned int get_le24(AVIOContext *s);
attribute_deprecated unsigned int get_le32(AVIOContext *s);
attribute_deprecated uint64_t     get_le64(AVIOContext *s);
attribute_deprecated unsigned int get_be16(AVIOContext *s);
attribute_deprecated unsigned int get_be24(AVIOContext *s);
attribute_deprecated unsigned int get_be32(AVIOContext *s);
attribute_deprecated uint64_t     get_be64(AVIOContext *s);

attribute_deprecated void         put_byte(AVIOContext *s, int b);
attribute_deprecated void         put_nbyte(AVIOContext *s, int b, int count);
attribute_deprecated void         put_buffer(AVIOContext *s, const unsigned char *buf, int size);
attribute_deprecated void         put_le64(AVIOContext *s, uint64_t val);
attribute_deprecated void         put_be64(AVIOContext *s, uint64_t val);
attribute_deprecated void         put_le32(AVIOContext *s, unsigned int val);
attribute_deprecated void         put_be32(AVIOContext *s, unsigned int val);
attribute_deprecated void         put_le24(AVIOContext *s, unsigned int val);
attribute_deprecated void         put_be24(AVIOContext *s, unsigned int val);
attribute_deprecated void         put_le16(AVIOContext *s, unsigned int val);
attribute_deprecated void         put_be16(AVIOContext *s, unsigned int val);
attribute_deprecated void         put_tag(AVIOContext *s, const char *tag);
attribute_deprecated int url_fopen( AVIOContext **s, const char *url, int flags);
attribute_deprecated int url_fclose(AVIOContext *s);
attribute_deprecated int64_t url_fseek(AVIOContext *s, int64_t offset, int whence);
attribute_deprecated int url_fskip(AVIOContext *s, int64_t offset);
attribute_deprecated int64_t url_ftell(AVIOContext *s);
attribute_deprecated int64_t url_fsize(AVIOContext *s);
#define URL_EOF (-1)
attribute_deprecated int url_fgetc(AVIOContext *s);
attribute_deprecated int url_setbufsize(AVIOContext *s, int buf_size);
#ifdef __GNUC__
attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3)));
#else
attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...);
#endif
attribute_deprecated void put_flush_packet(AVIOContext *s);
attribute_deprecated int url_ferror(AVIOContext *s);
#endif

AVIOContext *avio_alloc_context(
                  unsigned char *buffer,
                  int buffer_size,
                  int write_flag,
                  void *opaque,
                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
                  int64_t (*seek)(void *opaque, int64_t offset, int whence));

void avio_w8(AVIOContext *s, int b);
void avio_write(AVIOContext *s, const unsigned char *buf, int size);
void avio_wl64(AVIOContext *s, uint64_t val);
void avio_wb64(AVIOContext *s, uint64_t val);
void avio_wl32(AVIOContext *s, unsigned int val);
void avio_wb32(AVIOContext *s, unsigned int val);
void avio_wl24(AVIOContext *s, unsigned int val);
void avio_wb24(AVIOContext *s, unsigned int val);
void avio_wl16(AVIOContext *s, unsigned int val);
void avio_wb16(AVIOContext *s, unsigned int val);

#if FF_API_OLD_AVIO
attribute_deprecated void put_strz(AVIOContext *s, const char *buf);
#endif

int avio_put_str(AVIOContext *s, const char *str);

int avio_put_str16le(AVIOContext *s, const char *str);

int64_t avio_seek(AVIOContext *s, int64_t offset, int whence);

int64_t avio_skip(AVIOContext *s, int64_t offset);

static av_always_inline int64_t avio_tell(AVIOContext *s)
{
    return avio_seek(s, 0, SEEK_CUR);
}

int64_t avio_size(AVIOContext *s);

int url_feof(AVIOContext *s);

int av_url_read_fpause(AVIOContext *h, int pause);
int64_t av_url_read_fseek(AVIOContext *h, int stream_index,
                          int64_t timestamp, int flags);

#ifdef __GNUC__
int avio_printf(AVIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3)));
#else
int avio_printf(AVIOContext *s, const char *fmt, ...);
#endif

#if FF_API_OLD_AVIO

attribute_deprecated char *url_fgets(AVIOContext *s, char *buf, int buf_size);
#endif

void avio_flush(AVIOContext *s);


int avio_read(AVIOContext *s, unsigned char *buf, int size);

int          avio_r8  (AVIOContext *s);
unsigned int avio_rl16(AVIOContext *s);
unsigned int avio_rl24(AVIOContext *s);
unsigned int avio_rl32(AVIOContext *s);
uint64_t     avio_rl64(AVIOContext *s);

int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen);

int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen);
int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen);

#if FF_API_OLD_AVIO

attribute_deprecated char *get_strz(AVIOContext *s, char *buf, int maxlen);
#endif
unsigned int avio_rb16(AVIOContext *s);
unsigned int avio_rb24(AVIOContext *s);
unsigned int avio_rb32(AVIOContext *s);
uint64_t     avio_rb64(AVIOContext *s);

static inline int url_is_streamed(AVIOContext *s)
{
    return s->is_streamed;
}

int url_fdopen(AVIOContext **s, URLContext *h);

#if FF_API_URL_RESETBUF

int url_resetbuf(AVIOContext *s, int flags);
#endif

int avio_open(AVIOContext **s, const char *url, int flags);

int avio_close(AVIOContext *s);
URLContext *url_fileno(AVIOContext *s);

#if FF_API_OLD_AVIO

attribute_deprecated int url_fget_max_packet_size(AVIOContext *s);

attribute_deprecated int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags);

attribute_deprecated int url_close_buf(AVIOContext *s);
#endif

int url_open_dyn_buf(AVIOContext **s);

int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);

int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);

unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
                                    unsigned int len);
unsigned long get_checksum(AVIOContext *s);
void init_checksum(AVIOContext *s,
                   unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
                   unsigned long checksum);

/* udp.c */
int udp_set_remote_url(URLContext *h, const char *uri);
int udp_get_local_port(URLContext *h);
#if FF_API_UDP_GET_FILE
int udp_get_file_handle(URLContext *h);
#endif

#endif /* AVFORMAT_AVIO_H */

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