libav/avio.h

   1 #ifndef AVIO_H
   2 #define AVIO_H
   3
   4 /* output byte stream handling */
   5
   6 typedef INT64 offset_t;
   7
   8 /* unbuffered I/O */
   9
  10 struct URLContext {
  11     struct URLProtocol *prot;
  12     int flags;
  13     int is_streamed;  /* true if streamed (no seek possible), default = false */
  14     int max_packet_size;  /* if non zero, the stream is packetized with this max packet size */
  15     void *priv_data;
  16 };
  17
  18 typedef struct URLContext URLContext;
  19
  20 typedef struct URLPollEntry {
  21     URLContext *handle;
  22     int events;
  23     int revents;
  24 } URLPollEntry;
  25
  26 #define URL_RDONLY 0
  27 #define URL_WRONLY 1
  28 #define URL_RDWR   2
  29
  30 int url_open(URLContext **h, const char *filename, int flags);
  31 int url_read(URLContext *h, unsigned char *buf, int size);
  32 int url_write(URLContext *h, unsigned char *buf, int size);
  33 offset_t url_seek(URLContext *h, offset_t pos, int whence);
  34 int url_close(URLContext *h);
  35 int url_exist(const char *filename);
  36 offset_t url_filesize(URLContext *h);
  37 int url_get_max_packet_size(URLContext *h);
  38 /* not implemented */
  39 int url_poll(URLPollEntry *poll_table, int n, int timeout);
  40
  41 typedef struct URLProtocol {
  42     const char *name;
  43     int (*url_open)(URLContext *h, const char *filename, int flags);
  44     int (*url_read)(URLContext *h, unsigned char *buf, int size);
  45     int (*url_write)(URLContext *h, unsigned char *buf, int size);
  46     offset_t (*url_seek)(URLContext *h, offset_t pos, int whence);
  47     int (*url_close)(URLContext *h);
  48     struct URLProtocol *next;
  49 } URLProtocol;
  50
  51 extern URLProtocol *first_protocol;
  52
  53 int register_protocol(URLProtocol *protocol);
  54
  55 typedef struct {
  56     unsigned char *buffer;
  57     int buffer_size;
  58     unsigned char *buf_ptr, *buf_end;
  59     void *opaque;
  60     int (*read_packet)(void *opaque, UINT8 *buf, int buf_size);
  61     void (*write_packet)(void *opaque, UINT8 *buf, int buf_size);
  62     int (*seek)(void *opaque, offset_t offset, int whence);
  63     offset_t pos; /* position in the file of the current buffer */
  64     int must_flush; /* true if the next seek should flush */
  65     int eof_reached; /* true if eof reached */
  66     int write_flag;  /* true if open for writing */
  67     int is_streamed;
  68     int max_packet_size;
  69 } ByteIOContext;
  70
  71 int init_put_byte(ByteIOContext *s,
  72                   unsigned char *buffer,
  73                   int buffer_size,
  74                   int write_flag,
  75                   void *opaque,
  76                   int (*read_packet)(void *opaque, UINT8 *buf, int buf_size),
  77                   void (*write_packet)(void *opaque, UINT8 *buf, int buf_size),
  78                   int (*seek)(void *opaque, offset_t offset, int whence));
  79
  80 void put_byte(ByteIOContext *s, int b);
  81 void put_buffer(ByteIOContext *s, unsigned char *buf, int size);
  82 void put_le64(ByteIOContext *s, UINT64 val);
  83 void put_be64(ByteIOContext *s, UINT64 val);
  84 void put_le32(ByteIOContext *s, unsigned int val);
  85 void put_be32(ByteIOContext *s, unsigned int val);
  86 void put_le16(ByteIOContext *s, unsigned int val);
  87 void put_be16(ByteIOContext *s, unsigned int val);
  88 void put_tag(ByteIOContext *s, char *tag);
  89
  90 offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence);
  91 void url_fskip(ByteIOContext *s, offset_t offset);
  92 offset_t url_ftell(ByteIOContext *s);
  93 int url_feof(ByteIOContext *s);
  94
  95 #define URL_EOF (-1)
  96 int url_fgetc(ByteIOContext *s);
  97 int url_fprintf(ByteIOContext *s, const char *fmt, ...);
  98 char *url_fgets(ByteIOContext *s, char *buf, int buf_size);
  99
 100 void put_flush_packet(ByteIOContext *s);
 101
 102 int get_buffer(ByteIOContext *s, unsigned char *buf, int size);
 103 int get_byte(ByteIOContext *s);
 104 unsigned int get_le32(ByteIOContext *s);
 105 UINT64 get_le64(ByteIOContext *s);
 106 unsigned int get_le16(ByteIOContext *s);
 107
 108 unsigned int get_be16(ByteIOContext *s);
 109 unsigned int get_be32(ByteIOContext *s);
 110 UINT64 get_be64(ByteIOContext *s);
 111
 112 static inline int url_is_streamed(ByteIOContext *s)
 113 {
 114     return s->is_streamed;
 115 }
 116
 117 int url_fdopen(ByteIOContext *s, URLContext *h);
 118 int url_setbufsize(ByteIOContext *s, int buf_size);
 119 int url_fopen(ByteIOContext *s, const char *filename, int flags);
 120 int url_fclose(ByteIOContext *s);
 121 URLContext *url_fileno(ByteIOContext *s);
 122 int url_fget_max_packet_size(ByteIOContext *s);
 123
 124 int url_open_buf(ByteIOContext *s, UINT8 *buf, int buf_size, int flags);
 125 int url_close_buf(ByteIOContext *s);
 126
 127 int url_open_dyn_buf(ByteIOContext *s);
 128 int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size);
 129 int url_close_dyn_buf(ByteIOContext *s, UINT8 **pbuffer);
 130
 131 /* file.c */
 132 extern URLProtocol file_protocol;
 133 extern URLProtocol pipe_protocol;
 134
 135 /* udp.c */
 136 extern URLProtocol udp_protocol;
 137 int udp_set_remote_url(URLContext *h, const char *uri);
 138 int udp_get_local_port(URLContext *h);
 139 int udp_get_file_handle(URLContext *h);
 140
 141 /* tcp.c  */
 142 extern URLProtocol tcp_protocol;
 143
 144 /* http.c */
 145 extern URLProtocol http_protocol;
 146
 147 #endif
 148