Libav
avio_internal.h
Go to the documentation of this file.
1 /*
2  * This file is part of Libav.
3  *
4  * Libav is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * Libav is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with Libav; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVFORMAT_AVIO_INTERNAL_H
20 #define AVFORMAT_AVIO_INTERNAL_H
21 
22 #include "avio.h"
23 #include "url.h"
24 
25 #include "libavutil/log.h"
26 
27 extern const AVClass ff_avio_class;
28 
30  unsigned char *buffer,
31  int buffer_size,
32  int write_flag,
33  void *opaque,
34  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
35  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
36  int64_t (*seek)(void *opaque, int64_t offset, int whence));
37 
38 
54 int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
55 
62 int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);
63 
64 void ffio_fill(AVIOContext *s, int b, int count);
65 
67 {
68  avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
69 }
70 
83 int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size);
84 
85 uint64_t ffio_read_varlen(AVIOContext *bc);
86 
92 int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
93 
95 int ffio_set_buf_size(AVIOContext *s, int buf_size);
96 
98  unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
99  unsigned long checksum);
100 unsigned long ffio_get_checksum(AVIOContext *s);
101 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
102  unsigned int len);
103 unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
104  unsigned int len);
105 
115 int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
116 
128 int ffio_fdopen(AVIOContext **s, URLContext *h);
129 
139 
147 
154 
155 #endif /* AVFORMAT_AVIO_INTERNAL_H */
uint64_t ffio_read_varlen(AVIOContext *bc)
Definition: aviobuf.c:769
Bytestream IO Context.
Definition: avio.h:104
Buffered I/O operations.
int size
int ffio_close_null_buf(AVIOContext *s)
Close a null buffer.
Definition: aviobuf.c:1213
int ffio_read_size(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:592
static char buffer[20]
Definition: seek.c:32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:316
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:600
const AVClass ff_avio_class
Definition: aviobuf.c:97
static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
Definition: avio_internal.h:66
int ffio_set_buf_size(AVIOContext *s, int buf_size)
Definition: aviobuf.c:860
int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:612
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:524
void ffio_fill(AVIOContext *s, int b, int count)
Definition: aviobuf.c:207
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:1148
unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:504
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:889
unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf, unsigned int len)
Definition: aviobuf.c:510
static volatile int checksum
Definition: adler32.c:27
void ffio_free_dyn_buf(AVIOContext **s)
Free a dynamic buffer.
Definition: aviobuf.c:1183
static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost)
Definition: avconv.c:278
Definition: url.h:38
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
Describe the class of an AVClass context structure.
Definition: log.h:34
unsigned long ffio_get_checksum(AVIOContext *s)
Definition: aviobuf.c:516
int ffio_open_null_buf(AVIOContext **s)
Open a write-only fake memory stream.
Definition: aviobuf.c:1203
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:109
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:814
unbuffered private I/O API
#define av_always_inline
Definition: attributes.h:40
#define MKTAG(a, b, c, d)
Definition: common.h:256