mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 15:52:25 +00:00
ca9964a4fb
The main reason for this was compatibility; but some associated problems have been solved in the previous commit.
203 lines
7.9 KiB
C
203 lines
7.9 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 General Public License as published by
|
|
* the Free Software Foundation; either version 2 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with mpv. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef MP_AO_INTERNAL_H_
|
|
#define MP_AO_INTERNAL_H_
|
|
|
|
#include <stdbool.h>
|
|
#include <pthread.h>
|
|
|
|
#include "osdep/atomics.h"
|
|
#include "audio/out/ao.h"
|
|
|
|
/* global data used by ao.c and ao drivers */
|
|
struct ao {
|
|
int samplerate;
|
|
struct mp_chmap channels;
|
|
int format; // one of AF_FORMAT_...
|
|
int bps; // bytes per second (per plane)
|
|
int sstride; // size of a sample on each plane
|
|
// (format_size*num_channels/num_planes)
|
|
int num_planes;
|
|
bool probing; // if true, don't fail loudly on init
|
|
bool untimed; // don't assume realtime playback
|
|
int device_buffer; // device buffer in samples (guessed by
|
|
// common init code if not set by driver)
|
|
const struct ao_driver *api; // entrypoints to the wrapper (push.c/pull.c)
|
|
const struct ao_driver *driver;
|
|
void *priv;
|
|
struct encode_lavc_context *encode_lavc_ctx;
|
|
struct input_ctx *input_ctx;
|
|
struct mp_log *log; // Using e.g. "[ao/coreaudio]" as prefix
|
|
|
|
// The device as selected by the user, usually using ao_device_desc.name
|
|
// from an entry from the list returned by driver->list_devices. If the
|
|
// default device should be used, this is set to NULL.
|
|
char *device;
|
|
|
|
// Device actually chosen by the AO
|
|
char *detected_device;
|
|
|
|
// Application name to report to the audio API.
|
|
char *client_name;
|
|
|
|
// Used during init: if init fails, redirect to this ao
|
|
char *redirect;
|
|
|
|
// Internal events (use ao_request_reload(), ao_hotplug_event())
|
|
atomic_int events_;
|
|
|
|
int buffer;
|
|
double def_buffer;
|
|
void *api_priv;
|
|
};
|
|
|
|
extern const struct ao_driver ao_api_push;
|
|
extern const struct ao_driver ao_api_pull;
|
|
|
|
|
|
/* Note:
|
|
*
|
|
* In general, there are two types of audio drivers:
|
|
* a) push based (the user queues data that should be played)
|
|
* b) pull callback based (the audio API calls a callback to get audio)
|
|
*
|
|
* The ao.c code can handle both. It basically implements two audio paths
|
|
* and provides a uniform API for them. If ao_driver->play is NULL, it assumes
|
|
* that the driver uses a callback based audio API, otherwise push based.
|
|
*
|
|
* Requirements:
|
|
* a) ->play is called to queue audio. push.c creates a thread to regularly
|
|
* refill audio device buffers with ->play, but all driver functions are
|
|
* always called under an exclusive lock.
|
|
* Mandatory:
|
|
* init
|
|
* uninit
|
|
* reset
|
|
* get_space
|
|
* play
|
|
* get_delay
|
|
* pause
|
|
* resume
|
|
* Optional:
|
|
* control
|
|
* drain
|
|
* wait
|
|
* wakeup
|
|
* b) ->play must be NULL. ->resume must be provided, and should make the
|
|
* audio API start calling the audio callback. Your audio callback should
|
|
* in turn call ao_read_data() to get audio data. Most functions are
|
|
* optional and will be emulated if missing (e.g. pausing is emulated as
|
|
* silence). ->get_delay and ->get_space are never called.
|
|
* Mandatory:
|
|
* init
|
|
* uninit
|
|
* resume (starts the audio callback)
|
|
* Also, the following optional callbacks can be provided:
|
|
* reset (stops the audio callback, resume() restarts it)
|
|
* control
|
|
*/
|
|
struct ao_driver {
|
|
// If true, use with encoding only.
|
|
bool encode;
|
|
// Name used for --ao.
|
|
const char *name;
|
|
// Description shown with --ao=help.
|
|
const char *description;
|
|
// Init the device using ao->format/ao->channels/ao->samplerate. If the
|
|
// device doesn't accept these parameters, you can attempt to negotiate
|
|
// fallback parameters, and set the ao format fields accordingly.
|
|
int (*init)(struct ao *ao);
|
|
// Optional. See ao_control() etc. in ao.c
|
|
int (*control)(struct ao *ao, enum aocontrol cmd, void *arg);
|
|
void (*uninit)(struct ao *ao);
|
|
// push based: see ao_reset()
|
|
// pull based: stop the audio callback
|
|
void (*reset)(struct ao*ao);
|
|
// push based: see ao_pause()
|
|
void (*pause)(struct ao *ao);
|
|
// push based: see ao_resume()
|
|
// pull based: start the audio callback
|
|
void (*resume)(struct ao *ao);
|
|
// push based: see ao_play()
|
|
int (*get_space)(struct ao *ao);
|
|
// push based: see ao_play()
|
|
int (*play)(struct ao *ao, void **data, int samples, int flags);
|
|
// push based: see ao_get_delay()
|
|
double (*get_delay)(struct ao *ao);
|
|
// push based: block until all queued audio is played (optional)
|
|
void (*drain)(struct ao *ao);
|
|
// Optional. Return true if audio has stopped in any way.
|
|
bool (*get_eof)(struct ao *ao);
|
|
// Wait until the audio buffer needs to be refilled. The lock is the
|
|
// internal mutex usually protecting the internal AO state (and used to
|
|
// protect driver calls), and must be temporarily unlocked while waiting.
|
|
// ->wakeup will be called (with lock held) if the wait should be canceled.
|
|
// Returns 0 on success, -1 on error.
|
|
// Optional; if this is not provided, generic code using audio timing is
|
|
// used to estimate when the AO needs to be refilled.
|
|
// Warning: it's only called if the feed thread truly needs to know when
|
|
// the audio thread takes data again. Often, it will just copy
|
|
// the complete soft-buffer to the AO, and then wait for the
|
|
// decoder instead. Don't do necessary work in this callback.
|
|
int (*wait)(struct ao *ao, pthread_mutex_t *lock);
|
|
// In combination with wait(). Lock may or may not be held.
|
|
void (*wakeup)(struct ao *ao);
|
|
|
|
// Return the list of devices currently available in the system. Use
|
|
// ao_device_list_add() to add entries. The selected device will be set as
|
|
// ao->device (using ao_device_desc.name).
|
|
// Warning: the ao struct passed is not initialized with ao_driver->init().
|
|
// Instead, hotplug_init/hotplug_uninit is called. If these
|
|
// callbacks are not set, no driver initialization call is done
|
|
// on the ao struct.
|
|
void (*list_devs)(struct ao *ao, struct ao_device_list *list);
|
|
|
|
// If set, these are called before/after ao_driver->list_devs is called.
|
|
// It is also assumed that the driver can do hotplugging - which means
|
|
// it is expected to call ao_hotplug_event(ao) whenever the system's
|
|
// audio device list changes. The player will then call list_devs() again.
|
|
int (*hotplug_init)(struct ao *ao);
|
|
void (*hotplug_uninit)(struct ao *ao);
|
|
|
|
// For option parsing (see vo.h)
|
|
int priv_size;
|
|
const void *priv_defaults;
|
|
const struct m_option *options;
|
|
};
|
|
|
|
// These functions can be called by AOs.
|
|
|
|
int ao_play_silence(struct ao *ao, int samples);
|
|
int ao_read_data(struct ao *ao, void **data, int samples, int64_t out_time_us);
|
|
struct pollfd;
|
|
int ao_wait_poll(struct ao *ao, struct pollfd *fds, int num_fds,
|
|
pthread_mutex_t *lock);
|
|
void ao_wakeup_poll(struct ao *ao);
|
|
|
|
bool ao_chmap_sel_adjust(struct ao *ao, const struct mp_chmap_sel *s,
|
|
struct mp_chmap *map);
|
|
bool ao_chmap_sel_get_def(struct ao *ao, const struct mp_chmap_sel *s,
|
|
struct mp_chmap *map, int num);
|
|
|
|
// Add a deep copy of e to the list.
|
|
// Call from ao_driver->list_devs callback only.
|
|
void ao_device_list_add(struct ao_device_list *list, struct ao *ao,
|
|
struct ao_device_desc *e);
|
|
|
|
#endif
|