Libav
avio_internal.h
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1 /*
2  *
3  * This file is part of Libav.
4  *
5  * Libav is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
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12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
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18  */
19 
20 #ifndef AVFORMAT_AVIO_INTERNAL_H
21 #define AVFORMAT_AVIO_INTERNAL_H
22 
23 #include "avio.h"
24 #include "url.h"
25 
26 #include "libavutil/log.h"
27 
28 extern const AVClass ffio_url_class;
29 
31  unsigned char *buffer,
32  int buffer_size,
33  int write_flag,
34  void *opaque,
35  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
36  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
37  int64_t (*seek)(void *opaque, int64_t offset, int whence));
38 
39 
55 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
56 
63 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);
64 
65 void ffio_fill(AVIOContext *s, int b, int count);
66 
68 {
69  avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
70 }
71 
84 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size);
85 
86 uint64_t ffio_read_varlen(AVIOContext *bc);
87 
89 int ffio_set_buf_size(AVIOContext *s, int buf_size);
90 
92  unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
93  unsigned long checksum);
94 unsigned long ffio_get_checksum(AVIOContext *s);
95 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
96  unsigned int len);
97 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
98  unsigned int len);
99 
109 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
110 
122 int ffio_fdopen(AVIOContext **s, URLContext *h);
123 
133 
141 
142 #endif /* AVFORMAT_AVIO_INTERNAL_H */
uint64_t ffio_read_varlen(AVIOContext *bc)
Definition: aviobuf.c:679
Bytestream IO Context.
Definition: avio.h:68
Buffered I/O operations.
int size
int ffio_close_null_buf(AVIOContext *s)
Close a null buffer.
Definition: aviobuf.c:1025
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: assenc.c:58
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:271
uint8_t
#define b
Definition: input.c:52
const char data[16]
Definition: mxf.c:70
int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data)
Read size bytes from AVIOContext, returning a pointer.
Definition: aviobuf.c:510
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:67
int ffio_set_buf_size(AVIOContext *s, int buf_size)
Definition: aviobuf.c:721
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:522
void ffio_init_checksum(AVIOContext *s, unsigned long(*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum)
Definition: aviobuf.c:442
void ffio_fill(AVIOContext *s, int b, int count)
Definition: aviobuf.c:151
int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
Open a write only packetized memory stream with a maximum packet size of 'max_packet_size'.
Definition: aviobuf.c:970
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:422
static char buffer[20]
Definition: seek-test.c:31
int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file...
Definition: aviobuf.c:750
unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:428
const AVClass ffio_url_class
Definition: aviobuf.c:58
Definition: url.h:41
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
Describe the class of an AVClass context structure.
Definition: log.h:33
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:434
int ffio_open_null_buf(AVIOContext **s)
Open a write-only fake memory stream.
Definition: aviobuf.c:1015
int ffio_init_context(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))
Definition: aviobuf.c:70
int len
int ffio_fdopen(AVIOContext **s, URLContext *h)
Create and initialize a AVIOContext for accessing the resource referenced by the URLContext h...
Definition: aviobuf.c:690
unbuffered private I/O API
#define av_always_inline
Definition: attributes.h:40
#define MKTAG(a, b, c, d)
Definition: common.h:238