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🎥 Command line media player
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C
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#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_AVSEEKstruct 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.cstruct stream *stream_memory_open(struct mpv_global *global, void *data, int len);
// stream_concat.cstruct stream *stream_concat_open(struct mpv_global *global, struct mp_cancel *c, struct stream **streams, int num_streams);
// stream_file.cchar *mp_file_url_to_filename(void *talloc_ctx, bstr url);char *mp_file_get_path(void *talloc_ctx, bstr url);
// stream_lavf.cstruct 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 */