mirror of https://github.com/mpv-player/mpv
264 lines
9.5 KiB
C
264 lines
9.5 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MPLAYER_STREAM_H
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#define MPLAYER_STREAM_H
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#include "common/msg.h"
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include "misc/bstr.h"
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// Minimum guaranteed buffer and seek-back size. For any reads <= of this size,
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// it's guaranteed that you can seek back by <= of this size again.
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#define STREAM_BUFFER_SIZE 2048
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// flags for stream_open_ext (this includes STREAM_READ and STREAM_WRITE)
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// stream->mode
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#define STREAM_READ 0
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#define STREAM_WRITE (1 << 0)
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#define STREAM_SILENT (1 << 1)
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// Origin value for "security". This is an integer within the flags bit-field.
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#define STREAM_ORIGIN_DIRECT (1 << 2) // passed from cmdline or loadfile
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#define STREAM_ORIGIN_FS (2 << 2) // referenced from playlist on unix FS
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#define STREAM_ORIGIN_NET (3 << 2) // referenced from playlist on network
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#define STREAM_ORIGIN_UNSAFE (4 << 2) // from a grotesque source
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#define STREAM_ORIGIN_MASK (7 << 2) // for extracting origin value from flags
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// end flags for stream_open_ext (the naming convention sucks)
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#define STREAM_UNSAFE -3
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#define STREAM_NO_MATCH -2
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#define STREAM_UNSUPPORTED -1
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#define STREAM_ERROR 0
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#define STREAM_OK 1
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enum stream_ctrl {
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// Certain network protocols
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STREAM_CTRL_AVSEEK,
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STREAM_CTRL_HAS_AVSEEK,
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STREAM_CTRL_GET_METADATA,
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// Optical discs (internal interface between streams and demux_disc)
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STREAM_CTRL_GET_TIME_LENGTH,
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STREAM_CTRL_GET_DVD_INFO,
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STREAM_CTRL_GET_DISC_NAME,
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STREAM_CTRL_GET_NUM_CHAPTERS,
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STREAM_CTRL_GET_CURRENT_TIME,
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STREAM_CTRL_GET_CHAPTER_TIME,
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STREAM_CTRL_SEEK_TO_TIME,
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STREAM_CTRL_GET_ASPECT_RATIO,
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STREAM_CTRL_GET_NUM_ANGLES,
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STREAM_CTRL_GET_ANGLE,
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STREAM_CTRL_SET_ANGLE,
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STREAM_CTRL_GET_NUM_TITLES,
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STREAM_CTRL_GET_TITLE_LENGTH, // double* (in: title number, out: len)
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STREAM_CTRL_GET_LANG,
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STREAM_CTRL_GET_CURRENT_TITLE,
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STREAM_CTRL_SET_CURRENT_TITLE,
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};
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struct stream_lang_req {
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int type; // STREAM_AUDIO, STREAM_SUB
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int id;
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char name[50];
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};
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struct stream_dvd_info_req {
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unsigned int palette[16];
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int num_subs;
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};
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// for STREAM_CTRL_AVSEEK
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struct stream_avseek {
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int stream_index;
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int64_t timestamp;
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int flags;
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};
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struct stream;
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struct stream_open_args;
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typedef struct stream_info_st {
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const char *name;
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// opts is set from ->opts
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int (*open)(struct stream *st);
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// Alternative to open(). Only either open() or open2() can be set.
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int (*open2)(struct stream *st, struct stream_open_args *args);
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const char *const *protocols;
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bool can_write; // correctly checks for READ/WRITE modes
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int stream_origin; // 0 or set of STREAM_ORIGIN_*; if 0, the same origin
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// is set, or the stream's open() function handles it
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} stream_info_t;
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typedef struct stream {
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const struct stream_info_st *info;
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// Read
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int (*fill_buffer)(struct stream *s, void *buffer, int max_len);
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// Write
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int (*write_buffer)(struct stream *s, void *buffer, int len);
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// Seek
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int (*seek)(struct stream *s, int64_t pos);
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// Total stream size in bytes (negative if unavailable)
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int64_t (*get_size)(struct stream *s);
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// Control
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int (*control)(struct stream *s, int cmd, void *arg);
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// Close
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void (*close)(struct stream *s);
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int64_t pos;
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int eof; // valid only after read calls that returned a short result
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int mode; //STREAM_READ or STREAM_WRITE
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int stream_origin; // any STREAM_ORIGIN_*
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void *priv; // used for DVD, TV, RTSP etc
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char *url; // filename/url (possibly including protocol prefix)
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char *path; // filename (url without protocol prefix)
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char *mime_type; // when HTTP streaming is used
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char *demuxer; // request demuxer to be used
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char *lavf_type; // name of expected demuxer type for lavf
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bool streaming : 1; // known to be a network stream if true
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bool seekable : 1; // presence of general byte seeking support
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bool fast_skip : 1; // consider stream fast enough to fw-seek by skipping
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bool is_network : 1; // I really don't know what this is for
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bool is_local_file : 1; // from the filesystem
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bool is_directory : 1; // directory on the filesystem
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bool access_references : 1; // open other streams
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struct mp_log *log;
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struct mpv_global *global;
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struct mp_cancel *cancel; // cancellation notification
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// Read statistic for fill_buffer calls. All bytes read by fill_buffer() are
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// added to this. The user can reset this as needed.
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uint64_t total_unbuffered_read_bytes;
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// Seek statistics. The user can reset this as needed.
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uint64_t total_stream_seeks;
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// Buffer size requested by user; s->buffer may have a different size
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int requested_buffer_size;
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// This is a ring buffer. It is reset only on seeks (or when buffers are
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// dropped). Otherwise old contents always stay valid.
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// The valid buffer is from buf_start to buf_end; buf_end can be larger
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// than the buffer size (requires wrap around). buf_cur is a value in the
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// range [buf_start, buf_end].
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// When reading more data from the stream, buf_start is advanced as old
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// data is overwritten with new data.
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// Example:
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// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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// +===========================+---------------------------+
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// + 05 06 07 08 | 01 02 03 04 + 05 06 07 08 | 01 02 03 04 +
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// +===========================+---------------------------+
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// ^ buf_start (4) | |
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// | ^ buf_end (12 % 8 => 4)
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// ^ buf_cur (9 % 8 => 1)
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// Here, the entire 8 byte buffer is filled, i.e. buf_end - buf_start = 8.
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// buffer_mask == 7, so (x & buffer_mask) == (x % buffer_size)
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unsigned int buf_start; // index of oldest byte in buffer (is <= buffer_mask)
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unsigned int buf_cur; // current read pos (can be > buffer_mask)
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unsigned int buf_end; // end position (can be > buffer_mask)
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unsigned int buffer_mask; // buffer_size-1, where buffer_size == 2**n
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uint8_t *buffer;
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} stream_t;
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// Non-inline version of stream_read_char().
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int stream_read_char_fallback(stream_t *s);
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int stream_write_buffer(stream_t *s, void *buf, int len);
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inline static int stream_read_char(stream_t *s)
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{
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return s->buf_cur < s->buf_end
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? s->buffer[(s->buf_cur++) & s->buffer_mask]
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: stream_read_char_fallback(s);
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}
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int stream_skip_bom(struct stream *s);
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inline static int64_t stream_tell(stream_t *s)
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{
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return s->pos + s->buf_cur - s->buf_end;
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}
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bool stream_seek_skip(stream_t *s, int64_t pos);
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bool stream_seek(stream_t *s, int64_t pos);
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int stream_read(stream_t *s, void *mem, int total);
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int stream_read_partial(stream_t *s, void *buf, int buf_size);
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int stream_read_peek(stream_t *s, void *buf, int buf_size);
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void stream_drop_buffers(stream_t *s);
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int64_t stream_get_size(stream_t *s);
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struct mpv_global;
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struct bstr stream_read_complete(struct stream *s, void *talloc_ctx,
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int max_size);
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struct bstr stream_read_file(const char *filename, void *talloc_ctx,
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struct mpv_global *global, int max_size);
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int stream_control(stream_t *s, int cmd, void *arg);
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void free_stream(stream_t *s);
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struct stream_open_args {
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struct mpv_global *global;
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struct mp_cancel *cancel; // aborting stream access (used directly)
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const char *url;
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int flags; // STREAM_READ etc.
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const stream_info_t *sinfo; // NULL = autoprobe, otherwise force stream impl.
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void *special_arg; // specific to impl., use only with sinfo
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};
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int stream_create_with_args(struct stream_open_args *args, struct stream **ret);
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struct stream *stream_create(const char *url, int flags,
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struct mp_cancel *c, struct mpv_global *global);
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stream_t *open_output_stream(const char *filename, struct mpv_global *global);
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void mp_url_unescape_inplace(char *buf);
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char *mp_url_escape(void *talloc_ctx, const char *s, const char *ok);
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// stream_memory.c
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struct stream *stream_memory_open(struct mpv_global *global, void *data, int len);
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// stream_concat.c
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struct stream *stream_concat_open(struct mpv_global *global, struct mp_cancel *c,
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struct stream **streams, int num_streams);
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// stream_file.c
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char *mp_file_url_to_filename(void *talloc_ctx, bstr url);
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char *mp_file_get_path(void *talloc_ctx, bstr url);
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// stream_lavf.c
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struct AVDictionary;
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void mp_setup_av_network_options(struct AVDictionary **dict,
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const char *target_fmt,
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struct mpv_global *global,
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struct mp_log *log);
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void stream_print_proto_list(struct mp_log *log);
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char **stream_get_proto_list(void);
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bool stream_has_proto(const char *proto);
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#endif /* MPLAYER_STREAM_H */
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