mpv/stream/stream.h

264 lines
9.5 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"
// Minimum guaranteed buffer and seek-back size. For any reads <= of this size,
// it's guaranteed that you can seek back by <= of this size again.
#define STREAM_BUFFER_SIZE 2048
// flags for stream_open_ext (this includes STREAM_READ and STREAM_WRITE)
// stream->mode
#define STREAM_READ 0
#define STREAM_WRITE (1 << 0)
#define STREAM_SILENT (1 << 1)
// Origin value for "security". This is an integer within the flags bit-field.
#define STREAM_ORIGIN_DIRECT (1 << 2) // passed from cmdline or loadfile
#define STREAM_ORIGIN_FS (2 << 2) // referenced from playlist on unix FS
#define STREAM_ORIGIN_NET (3 << 2) // referenced from playlist on network
#define STREAM_ORIGIN_UNSAFE (4 << 2) // from a grotesque source
#define STREAM_ORIGIN_MASK (7 << 2) // for extracting origin value from flags
// end flags for stream_open_ext (the naming convention sucks)
#define STREAM_UNSAFE -3
#define STREAM_NO_MATCH -2
#define STREAM_UNSUPPORTED -1
#define STREAM_ERROR 0
#define STREAM_OK 1
enum stream_ctrl {
// Certain network protocols
STREAM_CTRL_AVSEEK,
STREAM_CTRL_HAS_AVSEEK,
STREAM_CTRL_GET_METADATA,
// Optical discs (internal interface between streams and demux_disc)
STREAM_CTRL_GET_TIME_LENGTH,
STREAM_CTRL_GET_DVD_INFO,
STREAM_CTRL_GET_DISC_NAME,
STREAM_CTRL_GET_NUM_CHAPTERS,
STREAM_CTRL_GET_CURRENT_TIME,
STREAM_CTRL_GET_CHAPTER_TIME,
STREAM_CTRL_SEEK_TO_TIME,
STREAM_CTRL_GET_ASPECT_RATIO,
STREAM_CTRL_GET_NUM_ANGLES,
STREAM_CTRL_GET_ANGLE,
STREAM_CTRL_SET_ANGLE,
STREAM_CTRL_GET_NUM_TITLES,
STREAM_CTRL_GET_TITLE_LENGTH, // double* (in: title number, out: len)
STREAM_CTRL_GET_LANG,
STREAM_CTRL_GET_CURRENT_TITLE,
STREAM_CTRL_SET_CURRENT_TITLE,
};
struct stream_lang_req {
int type; // STREAM_AUDIO, STREAM_SUB
int id;
char name[50];
};
struct stream_dvd_info_req {
unsigned int palette[16];
int num_subs;
};
// 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
int stream_origin; // 0 or set of STREAM_ORIGIN_*; if 0, the same origin
// is set, or the stream's open() function handles it
} stream_info_t;
typedef struct stream {
const struct stream_info_st *info;
// Read
int (*fill_buffer)(struct stream *s, void *buffer, int max_len);
// Write
int (*write_buffer)(struct stream *s, void *buffer, int len);
// Seek
int (*seek)(struct stream *s, int64_t pos);
// Total stream size in bytes (negative if unavailable)
int64_t (*get_size)(struct stream *s);
// Control
int (*control)(struct stream *s, int cmd, void *arg);
// Close
void (*close)(struct stream *s);
int64_t pos;
int eof; // valid only after read calls that returned a short result
int mode; //STREAM_READ or STREAM_WRITE
int stream_origin; // any STREAM_ORIGIN_*
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; // I really don't know what this is for
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;
// Seek statistics. The user can reset this as needed.
uint64_t total_stream_seeks;
// Buffer size requested by user; s->buffer may have a different size
int requested_buffer_size;
// This is a ring buffer. It is reset only on seeks (or when buffers are
// dropped). Otherwise old contents always stay valid.
// The valid buffer is from buf_start to buf_end; buf_end can be larger
// than the buffer size (requires wrap around). buf_cur is a value in the
// range [buf_start, buf_end].
// When reading more data from the stream, buf_start is advanced as old
// data is overwritten with new data.
// Example:
// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
// +===========================+---------------------------+
// + 05 06 07 08 | 01 02 03 04 + 05 06 07 08 | 01 02 03 04 +
// +===========================+---------------------------+
// ^ buf_start (4) | |
// | ^ buf_end (12 % 8 => 4)
// ^ buf_cur (9 % 8 => 1)
// Here, the entire 8 byte buffer is filled, i.e. buf_end - buf_start = 8.
// buffer_mask == 7, so (x & buffer_mask) == (x % buffer_size)
unsigned int buf_start; // index of oldest byte in buffer (is <= buffer_mask)
unsigned int buf_cur; // current read pos (can be > buffer_mask)
unsigned int buf_end; // end position (can be > buffer_mask)
unsigned int buffer_mask; // buffer_size-1, where buffer_size == 2**n
uint8_t *buffer;
} stream_t;
// Non-inline version of stream_read_char().
int stream_read_char_fallback(stream_t *s);
int stream_write_buffer(stream_t *s, void *buf, int len);
inline static int stream_read_char(stream_t *s)
{
return s->buf_cur < s->buf_end
? s->buffer[(s->buf_cur++) & s->buffer_mask]
: stream_read_char_fallback(s);
}
int stream_skip_bom(struct stream *s);
inline static int64_t stream_tell(stream_t *s)
{
return s->pos + s->buf_cur - s->buf_end;
}
bool stream_seek_skip(stream_t *s, int64_t pos);
bool stream_seek(stream_t *s, int64_t pos);
int stream_read(stream_t *s, void *mem, int total);
int stream_read_partial(stream_t *s, void *buf, int buf_size);
int stream_read_peek(stream_t *s, void *buf, int buf_size);
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);
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,
const char *target_fmt,
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 */