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mpv/stream/stream.h
wm4 2bb5ab07b7 stream: rearrange open functions
Add yet another variant of the stream open function. This time, make it
so that it's possible to add new open parameters in an extendable way,
which should put an end to having to change this every other year.

Effectively get rid of the overly special stream_create_instance()
function and use the new one instead, which requires changes in
stream_concat.c and stream_memory.c. The function is still in private in
stream.c, but I preferred to make the mentioned users go through the new
function for orthogonality. The error handling (mostly logging) was
adjusted accordingly.

This should not have any functional changes. (To preempt any excuses, I
didn't actually test stream_concat and stream_memory.)
2019-09-29 00:46:54 +02:00

210 lines
6.8 KiB
C

/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MPLAYER_STREAM_H
#define MPLAYER_STREAM_H
#include "common/msg.h"
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <fcntl.h>
#include "misc/bstr.h"
#define STREAM_BUFFER_SIZE 2048
// stream->mode
#define STREAM_READ 0
#define STREAM_WRITE 1
// flags for stream_open_ext (this includes STREAM_READ and STREAM_WRITE)
#define STREAM_SAFE_ONLY 4
#define STREAM_NETWORK_ONLY 8
#define STREAM_SILENT 16
#define STREAM_UNSAFE -3
#define STREAM_NO_MATCH -2
#define STREAM_UNSUPPORTED -1
#define STREAM_ERROR 0
#define STREAM_OK 1
enum stream_ctrl {
STREAM_CTRL_GET_SIZE = 1,
// Certain network protocols
STREAM_CTRL_AVSEEK,
STREAM_CTRL_HAS_AVSEEK,
STREAM_CTRL_GET_METADATA,
// Garbage compatibility for obnoxious users
STREAM_CTRL_OPTICAL_CRAP_HACK1,
STREAM_CTRL_OPTICAL_CRAP_HACK2,
};
// for STREAM_CTRL_AVSEEK
struct stream_avseek {
int stream_index;
int64_t timestamp;
int flags;
};
struct stream;
struct stream_open_args;
typedef struct stream_info_st {
const char *name;
// opts is set from ->opts
int (*open)(struct stream *st);
// Alternative to open(). Only either open() or open2() can be set.
int (*open2)(struct stream *st, struct stream_open_args *args);
const char *const *protocols;
bool can_write; // correctly checks for READ/WRITE modes
bool is_safe; // opening is no security issue, even with remote provided URLs
bool is_network; // used to restrict remote playlist entries to remote URLs
} stream_info_t;
typedef struct stream {
const struct stream_info_st *info;
// Read
int (*fill_buffer)(struct stream *s, char *buffer, int max_len);
// Write
int (*write_buffer)(struct stream *s, char *buffer, int len);
// Seek
int (*seek)(struct stream *s, int64_t pos);
// Control
int (*control)(struct stream *s, int cmd, void *arg);
// Close
void (*close)(struct stream *s);
int read_chunk; // maximum amount of data to read at once to limit latency
unsigned int buf_pos, buf_len;
int64_t pos;
int eof;
int mode; //STREAM_READ or STREAM_WRITE
void *priv; // used for DVD, TV, RTSP etc
char *url; // filename/url (possibly including protocol prefix)
char *path; // filename (url without protocol prefix)
char *mime_type; // when HTTP streaming is used
char *demuxer; // request demuxer to be used
char *lavf_type; // name of expected demuxer type for lavf
bool streaming : 1; // known to be a network stream if true
bool seekable : 1; // presence of general byte seeking support
bool fast_skip : 1; // consider stream fast enough to fw-seek by skipping
bool is_network : 1; // original stream_info_t.is_network flag
bool is_local_file : 1; // from the filesystem
bool is_directory : 1; // directory on the filesystem
bool access_references : 1; // open other streams
struct mp_log *log;
struct mpv_global *global;
struct mp_cancel *cancel; // cancellation notification
// Read statistic for fill_buffer calls. All bytes read by fill_buffer() are
// added to this. The user can reset this as needed.
uint64_t total_unbuffered_read_bytes;
uint8_t *buffer;
int buffer_alloc;
uint8_t buffer_inline[STREAM_BUFFER_SIZE];
} stream_t;
int stream_fill_buffer(stream_t *s);
int stream_write_buffer(stream_t *s, unsigned char *buf, int len);
inline static int stream_read_char(stream_t *s)
{
return (s->buf_pos < s->buf_len) ? s->buffer[s->buf_pos++] :
(stream_fill_buffer(s) ? s->buffer[s->buf_pos++] : -256);
}
unsigned char *stream_read_line(stream_t *s, unsigned char *mem, int max,
int utf16);
int stream_skip_bom(struct stream *s);
inline static int stream_eof(stream_t *s)
{
return s->eof;
}
inline static int64_t stream_tell(stream_t *s)
{
return s->pos + s->buf_pos - s->buf_len;
}
bool stream_skip(stream_t *s, int64_t len);
bool stream_seek(stream_t *s, int64_t pos);
int stream_read(stream_t *s, char *mem, int total);
int stream_read_partial(stream_t *s, char *buf, int buf_size);
struct bstr stream_peek(stream_t *s, int len);
void stream_drop_buffers(stream_t *s);
int64_t stream_get_size(stream_t *s);
struct mpv_global;
struct bstr stream_read_complete(struct stream *s, void *talloc_ctx,
int max_size);
struct bstr stream_read_file(const char *filename, void *talloc_ctx,
struct mpv_global *global, int max_size);
int stream_control(stream_t *s, int cmd, void *arg);
void free_stream(stream_t *s);
struct stream_open_args {
struct mpv_global *global;
struct mp_cancel *cancel; // aborting stream access (used directly)
const char *url;
int flags; // STREAM_READ etc.
const stream_info_t *sinfo; // NULL = autoprobe, otherwise force stream impl.
void *special_arg; // specific to impl., use only with sinfo
};
int stream_create_with_args(struct stream_open_args *args, struct stream **ret);
struct stream *stream_create(const char *url, int flags,
struct mp_cancel *c, struct mpv_global *global);
struct stream *stream_open(const char *filename, struct mpv_global *global);
stream_t *open_output_stream(const char *filename, struct mpv_global *global);
void mp_url_unescape_inplace(char *buf);
char *mp_url_escape(void *talloc_ctx, const char *s, const char *ok);
// stream_memory.c
struct stream *stream_memory_open(struct mpv_global *global, void *data, int len);
// stream_concat.c
struct stream *stream_concat_open(struct mpv_global *global, struct mp_cancel *c,
struct stream **streams, int num_streams);
// stream_file.c
char *mp_file_url_to_filename(void *talloc_ctx, bstr url);
char *mp_file_get_path(void *talloc_ctx, bstr url);
// stream_lavf.c
struct AVDictionary;
void mp_setup_av_network_options(struct AVDictionary **dict,
struct mpv_global *global,
struct mp_log *log);
void stream_print_proto_list(struct mp_log *log);
char **stream_get_proto_list(void);
bool stream_has_proto(const char *proto);
#endif /* MPLAYER_STREAM_H */