mirror of https://github.com/mpv-player/mpv
133 lines
4.8 KiB
C
133 lines
4.8 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MP_AO_INTERNAL_H_
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#define MP_AO_INTERNAL_H_
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#include <stdbool.h>
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#include "audio/chmap.h"
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#include "audio/chmap_sel.h"
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// Minimum buffer size in seconds.
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#define MIN_BUFFER 0.2
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/* global data used by ao.c and ao drivers */
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struct ao {
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int samplerate;
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struct mp_chmap channels;
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int format; // one of AF_FORMAT_...
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int bps; // bytes per second (per plane)
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int sstride; // size of a sample on each plane
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// (format_size*num_channels/num_planes)
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int num_planes;
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bool probing; // if true, don't fail loudly on init
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bool untimed; // don't assume realtime playback
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bool no_persistent_volume; // the AO does the equivalent of af_volume
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bool per_application_mixer; // like above, but volume persists (per app)
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int device_buffer; // device buffer in samples (guessed by
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// common init code if not set by driver)
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const struct ao_driver *api; // entrypoints to the wrapper (push.c/pull.c)
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const struct ao_driver *driver;
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void *priv;
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struct encode_lavc_context *encode_lavc_ctx;
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struct input_ctx *input_ctx;
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struct mp_log *log; // Using e.g. "[ao/coreaudio]" as prefix
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int buffer;
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void *api_priv;
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};
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extern const struct ao_driver ao_api_push;
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extern const struct ao_driver ao_api_pull;
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/* Note:
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*
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* In general, there are two types of audio drivers:
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* a) push based (the user queues data that should be played)
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* b) pull callback based (the audio API calls a callback to get audio)
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*
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* The ao.c code can handle both. It basically implements two audio paths
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* and provides a uniform API for them. If ao_driver->play is NULL, it assumes
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* that the driver uses a callback based audio API, otherwise push based.
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*
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* Requirements:
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* a) Most functions (except ->control) must be provided. ->play is called to
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* queue audio. ao.c creates a thread to regularly refill audio device
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* buffers with ->play, but all driver functions are always called under
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* an exclusive lock.
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* Mandatory:
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* init
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* uninit
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* reset
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* get_space
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* play
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* get_delay
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* pause
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* resume
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* b) ->play must be NULL. The driver can start the audio API in init(). The
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* audio API in turn will start a thread and call a callback provided by the
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* driver. That callback calls ao_read_data() to get audio data. Most
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* functions are optional and will be emulated if missing (e.g. pausing
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* is emulated as silence). ->get_delay and ->get_space are never called.
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* Mandatory:
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* init
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* uninit
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*/
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struct ao_driver {
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// If true, use with encoding only.
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bool encode;
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// Name used for --ao.
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const char *name;
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// Description shown with --ao=help.
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const char *description;
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// Init the device using ao->format/ao->channels/ao->samplerate. If the
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// device doesn't accept these parameters, you can attempt to negotiate
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// fallback parameters, and set the ao format fields accordingly.
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int (*init)(struct ao *ao);
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// Optional. See ao_control() etc. in ao.c
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int (*control)(struct ao *ao, enum aocontrol cmd, void *arg);
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void (*uninit)(struct ao *ao);
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void (*reset)(struct ao*ao);
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int (*get_space)(struct ao *ao);
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int (*play)(struct ao *ao, void **data, int samples, int flags);
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float (*get_delay)(struct ao *ao);
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void (*pause)(struct ao *ao);
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void (*resume)(struct ao *ao);
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void (*drain)(struct ao *ao);
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// For option parsing (see vo.h)
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int priv_size;
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const void *priv_defaults;
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const struct m_option *options;
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};
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// These functions can be called by AOs.
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int ao_play_silence(struct ao *ao, int samples);
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void ao_wait_drain(struct ao *ao);
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int ao_read_data(struct ao *ao, void **data, int samples, int64_t out_time_us);
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bool ao_chmap_sel_adjust(struct ao *ao, const struct mp_chmap_sel *s,
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struct mp_chmap *map);
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bool ao_chmap_sel_get_def(struct ao *ao, const struct mp_chmap_sel *s,
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struct mp_chmap *map, int num);
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#endif
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