mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 15:52:25 +00:00
4d3a2c7e0d
The core didn't use these fields, and use of them was inconsistent accross AOs. Some didn't use them at all. Some only set them; the values were completely unused by the core. Some made full use of them. Remove these fields. In places where they are still needed, make them private AO state. Remove the --abs option. It set the buffer size for ao_oss and ao_dsound (being ignored by all other AOs), and was already marked as obsolete. If it turns out that it's still needed for ao_oss or ao_dsound, their default buffer sizes could be adjusted, and if even that doesn't help, AO suboptions could be added in these cases.
136 lines
3.3 KiB
C
136 lines
3.3 KiB
C
/*
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* null audio output driver
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*
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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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#include <stdio.h>
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#include <stdlib.h>
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#include "talloc.h"
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#include "config.h"
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#include "osdep/timer.h"
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#include "audio/format.h"
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#include "ao.h"
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struct priv {
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double last_time;
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float buffered_bytes;
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int buffersize;
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int outburst;
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};
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static void drain(struct ao *ao)
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{
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struct priv *priv = ao->priv;
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double now = mp_time_sec();
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priv->buffered_bytes -= (now - priv->last_time) * ao->bps;
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if (priv->buffered_bytes < 0)
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priv->buffered_bytes = 0;
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priv->last_time = now;
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}
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static int init(struct ao *ao, char *params)
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{
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struct priv *priv = talloc_zero(ao, struct priv);
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ao->priv = priv;
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struct mp_chmap_sel sel = {0};
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mp_chmap_sel_add_any(&sel);
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if (!ao_chmap_sel_adjust(ao, &sel, &ao->channels))
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return -1;
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int samplesize = af_fmt2bits(ao->format) / 8;
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priv->outburst = 256 * ao->channels.num * samplesize;
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// A "buffer" for about 0.2 seconds of audio
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priv->buffersize = (int)(ao->samplerate * 0.2 / 256 + 1) * priv->outburst;
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priv->last_time = mp_time_sec();
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return 0;
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}
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// close audio device
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static void uninit(struct ao *ao, bool cut_audio)
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{
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}
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// stop playing and empty buffers (for seeking/pause)
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static void reset(struct ao *ao)
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{
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struct priv *priv = ao->priv;
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priv->buffered_bytes = 0;
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}
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// stop playing, keep buffers (for pause)
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static void pause(struct ao *ao)
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{
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// for now, just call reset();
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reset(ao);
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}
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// resume playing, after audio_pause()
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static void resume(struct ao *ao)
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{
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}
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static int get_space(struct ao *ao)
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{
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struct priv *priv = ao->priv;
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drain(ao);
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return priv->buffersize - priv->buffered_bytes;
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}
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static int play(struct ao *ao, void *data, int len, int flags)
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{
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struct priv *priv = ao->priv;
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int maxbursts = (priv->buffersize - priv->buffered_bytes) / priv->outburst;
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int playbursts = len / priv->outburst;
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int bursts = playbursts > maxbursts ? maxbursts : playbursts;
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priv->buffered_bytes += bursts * priv->outburst;
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return bursts * priv->outburst;
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}
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static float get_delay(struct ao *ao)
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{
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struct priv *priv = ao->priv;
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drain(ao);
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return priv->buffered_bytes / ao->bps;
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}
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const struct ao_driver audio_out_null = {
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.info = &(const struct ao_info) {
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"Null audio output",
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"null",
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"Tobias Diedrich <ranma+mplayer@tdiedrich.de>",
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"",
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},
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.init = init,
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.uninit = uninit,
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.reset = reset,
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.get_space = get_space,
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.play = play,
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.get_delay = get_delay,
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.pause = pause,
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.resume = resume,
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};
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