+++ /dev/null
-/*
- * unbuffered io for ffmpeg system
- * 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 AVIO_H
-#define AVIO_H
-
-/* output byte stream handling */
-
-typedef int64_t offset_t;
-
-/* unbuffered I/O */
-
-struct URLContext {
- struct URLProtocol *prot;
- int flags;
- int is_streamed; /**< true if streamed (no seek possible), default = false */
- int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */
- void *priv_data;
-#if LIBAVFORMAT_VERSION_INT >= (52<<16)
- char *filename; /**< specified filename */
-#else
- char filename[1]; /**< specified filename */
-#endif
-};
-
-typedef struct URLContext URLContext;
-
-typedef struct URLPollEntry {
- URLContext *handle;
- int events;
- int revents;
-} URLPollEntry;
-
-#define URL_RDONLY 0
-#define URL_WRONLY 1
-#define URL_RDWR 2
-
-typedef int URLInterruptCB(void);
-
-int url_open(URLContext **h, const char *filename, int flags);
-int url_read(URLContext *h, unsigned char *buf, int size);
-int url_write(URLContext *h, unsigned char *buf, int size);
-offset_t url_seek(URLContext *h, offset_t pos, int whence);
-int url_close(URLContext *h);
-int url_exist(const char *filename);
-offset_t url_filesize(URLContext *h);
-
-/**
- * Return the maximum packet size associated to packetized file
- * handle. If the file is not packetized (stream like http or file on
- * disk), then 0 is returned.
- *
- * @param h file handle
- * @return maximum packet size in bytes
- */
-int url_get_max_packet_size(URLContext *h);
-void url_get_filename(URLContext *h, char *buf, int buf_size);
-
-/**
- * the callback is called in blocking functions to test regulary if
- * asynchronous interruption is needed. AVERROR(EINTR) is returned
- * in this case by the interrupted function. 'NULL' means no interrupt
- * callback is given. i
- */
-void url_set_interrupt_cb(URLInterruptCB *interrupt_cb);
-
-/* not implemented */
-int url_poll(URLPollEntry *poll_table, int n, int timeout);
-
-/**
- * passing this as the "whence" parameter to a seek function causes it to
- * return the filesize without seeking anywhere, supporting this is optional
- * if its not supprted then the seek function will return <0
- */
-#define AVSEEK_SIZE 0x10000
-
-typedef struct URLProtocol {
- const char *name;
- int (*url_open)(URLContext *h, const char *filename, int flags);
- int (*url_read)(URLContext *h, unsigned char *buf, int size);
- int (*url_write)(URLContext *h, unsigned char *buf, int size);
- offset_t (*url_seek)(URLContext *h, offset_t pos, int whence);
- int (*url_close)(URLContext *h);
- struct URLProtocol *next;
-} URLProtocol;
-
-extern URLProtocol *first_protocol;
-extern URLInterruptCB *url_interrupt_cb;
-
-int register_protocol(URLProtocol *protocol);
-
-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);
- offset_t (*seek)(void *opaque, offset_t offset, int whence);
- offset_t pos; /**< position in the file of the current buffer */
- int must_flush; /**< true if the next seek should flush */
- int eof_reached; /**< true if eof reached */
- int write_flag; /**< true if open for writing */
- 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; ///< contains the error code or 0 if no error happened
-} ByteIOContext;
-
-int init_put_byte(ByteIOContext *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),
- offset_t (*seek)(void *opaque, offset_t offset, int whence));
-
-void put_byte(ByteIOContext *s, int b);
-void put_buffer(ByteIOContext *s, const unsigned char *buf, int size);
-void put_le64(ByteIOContext *s, uint64_t val);
-void put_be64(ByteIOContext *s, uint64_t val);
-void put_le32(ByteIOContext *s, unsigned int val);
-void put_be32(ByteIOContext *s, unsigned int val);
-void put_le24(ByteIOContext *s, unsigned int val);
-void put_be24(ByteIOContext *s, unsigned int val);
-void put_le16(ByteIOContext *s, unsigned int val);
-void put_be16(ByteIOContext *s, unsigned int val);
-void put_tag(ByteIOContext *s, const char *tag);
-
-void put_strz(ByteIOContext *s, const char *buf);
-
-offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence);
-void url_fskip(ByteIOContext *s, offset_t offset);
-offset_t url_ftell(ByteIOContext *s);
-offset_t url_fsize(ByteIOContext *s);
-int url_feof(ByteIOContext *s);
-int url_ferror(ByteIOContext *s);
-
-#define URL_EOF (-1)
-/** @note return URL_EOF (-1) if EOF */
-int url_fgetc(ByteIOContext *s);
-
-/** @warning currently size is limited */
-#ifdef __GNUC__
-int url_fprintf(ByteIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3)));
-#else
-int url_fprintf(ByteIOContext *s, const char *fmt, ...);
-#endif
-
-/** @note unlike fgets, the EOL character is not returned and a whole
- line is parsed. return NULL if first char read was EOF */
-char *url_fgets(ByteIOContext *s, char *buf, int buf_size);
-
-void put_flush_packet(ByteIOContext *s);
-
-int get_buffer(ByteIOContext *s, unsigned char *buf, int size);
-int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size);
-
-/** @note return 0 if EOF, so you cannot use it if EOF handling is
- necessary */
-int get_byte(ByteIOContext *s);
-unsigned int get_le24(ByteIOContext *s);
-unsigned int get_le32(ByteIOContext *s);
-uint64_t get_le64(ByteIOContext *s);
-unsigned int get_le16(ByteIOContext *s);
-
-char *get_strz(ByteIOContext *s, char *buf, int maxlen);
-unsigned int get_be16(ByteIOContext *s);
-unsigned int get_be24(ByteIOContext *s);
-unsigned int get_be32(ByteIOContext *s);
-uint64_t get_be64(ByteIOContext *s);
-
-static inline int url_is_streamed(ByteIOContext *s)
-{
- return s->is_streamed;
-}
-
-int url_fdopen(ByteIOContext *s, URLContext *h);
-
-/** @warning must be called before any I/O */
-int url_setbufsize(ByteIOContext *s, int buf_size);
-
-/** @note when opened as read/write, the buffers are only used for
- reading */
-int url_fopen(ByteIOContext *s, const char *filename, int flags);
-int url_fclose(ByteIOContext *s);
-URLContext *url_fileno(ByteIOContext *s);
-
-/**
- * Return the maximum packet size associated to packetized buffered file
- * handle. If the file is not packetized (stream like http or file on
- * disk), then 0 is returned.
- *
- * @param h buffered file handle
- * @return maximum packet size in bytes
- */
-int url_fget_max_packet_size(ByteIOContext *s);
-
-int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags);
-
-/** return the written or read size */
-int url_close_buf(ByteIOContext *s);
-
-/**
- * Open a write only memory stream.
- *
- * @param s new IO context
- * @return zero if no error.
- */
-int url_open_dyn_buf(ByteIOContext *s);
-
-/**
- * Open a write only packetized memory stream with a maximum packet
- * size of 'max_packet_size'. The stream is stored in a memory buffer
- * with a big endian 4 byte header giving the packet size in bytes.
- *
- * @param s new IO context
- * @param max_packet_size maximum packet size (must be > 0)
- * @return zero if no error.
- */
-int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size);
-
-/**
- * Return the written size and a pointer to the buffer. The buffer
- * must be freed with av_free().
- * @param s IO context
- * @param pointer to a byte buffer
- * @return the length of the byte buffer
- */
-int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer);
-
-unsigned long get_checksum(ByteIOContext *s);
-void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum);
-
-/* file.c */
-extern URLProtocol file_protocol;
-extern URLProtocol pipe_protocol;
-
-/* udp.c */
-extern URLProtocol udp_protocol;
-int udp_set_remote_url(URLContext *h, const char *uri);
-int udp_get_local_port(URLContext *h);
-int udp_get_file_handle(URLContext *h);
-
-/* tcp.c */
-extern URLProtocol tcp_protocol;
-
-/* http.c */
-extern URLProtocol http_protocol;
-
-#endif
-
projects / opencv / blobdiff