mirror of
https://github.com/mpv-player/mpv
synced 2024-08-24 07:21:49 +02:00
430 lines
14 KiB
C
430 lines
14 KiB
C
/*
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* PulseAudio audio output driver.
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* Copyright (C) 2006 Lennart Poettering
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* Copyright (C) 2007 Reimar Doeffinger
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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 <string.h>
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#include <stdlib.h>
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#include <pulse/pulseaudio.h>
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#include "config.h"
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#include "libaf/af_format.h"
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#include "mp_msg.h"
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#include "audio_out.h"
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#include "audio_out_internal.h"
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#define PULSE_CLIENT_NAME "MPlayer"
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/** General driver info */
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static const ao_info_t info = {
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"PulseAudio audio output",
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"pulse",
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"Lennart Poettering",
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""
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};
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/** PulseAudio playback stream object */
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static struct pa_stream *stream;
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/** PulseAudio connection context */
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static struct pa_context *context;
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/** Main event loop object */
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static struct pa_threaded_mainloop *mainloop;
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static int broken_pause;
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LIBAO_EXTERN(pulse)
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#define GENERIC_ERR_MSG(ctx, str) \
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] "str": %s\n", \
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pa_strerror(pa_context_errno(ctx)))
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static void context_state_cb(pa_context *c, void *userdata) {
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switch (pa_context_get_state(c)) {
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case PA_CONTEXT_READY:
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case PA_CONTEXT_TERMINATED:
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case PA_CONTEXT_FAILED:
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pa_threaded_mainloop_signal(mainloop, 0);
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break;
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}
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}
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static void stream_state_cb(pa_stream *s, void *userdata) {
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switch (pa_stream_get_state(s)) {
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case PA_STREAM_READY:
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case PA_STREAM_FAILED:
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case PA_STREAM_TERMINATED:
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pa_threaded_mainloop_signal(mainloop, 0);
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break;
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}
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}
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static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
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pa_threaded_mainloop_signal(mainloop, 0);
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}
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static void stream_latency_update_cb(pa_stream *s, void *userdata) {
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pa_threaded_mainloop_signal(mainloop, 0);
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}
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static void success_cb(pa_stream *s, int success, void *userdata) {
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if (userdata)
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*(int *)userdata = success;
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pa_threaded_mainloop_signal(mainloop, 0);
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}
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/**
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* \brief waits for a pulseaudio operation to finish, frees it and
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* unlocks the mainloop
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* \param op operation to wait for
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* \return 1 if operation has finished normally (DONE state), 0 otherwise
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*/
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static int waitop(pa_operation *op) {
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pa_operation_state_t state;
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if (!op) {
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pa_threaded_mainloop_unlock(mainloop);
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return 0;
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}
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state = pa_operation_get_state(op);
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while (state == PA_OPERATION_RUNNING) {
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pa_threaded_mainloop_wait(mainloop);
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state = pa_operation_get_state(op);
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}
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pa_operation_unref(op);
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pa_threaded_mainloop_unlock(mainloop);
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return state == PA_OPERATION_DONE;
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}
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static const struct format_map_s {
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int mp_format;
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pa_sample_format_t pa_format;
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} format_maps[] = {
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{AF_FORMAT_S16_LE, PA_SAMPLE_S16LE},
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{AF_FORMAT_S16_BE, PA_SAMPLE_S16BE},
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#ifdef PA_SAMPLE_S32NE
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{AF_FORMAT_S32_LE, PA_SAMPLE_S32LE},
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{AF_FORMAT_S32_BE, PA_SAMPLE_S32BE},
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#endif
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#ifdef PA_SAMPLE_FLOAT32NE
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{AF_FORMAT_FLOAT_LE, PA_SAMPLE_FLOAT32LE},
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{AF_FORMAT_FLOAT_BE, PA_SAMPLE_FLOAT32BE},
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#endif
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{AF_FORMAT_U8, PA_SAMPLE_U8},
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{AF_FORMAT_MU_LAW, PA_SAMPLE_ULAW},
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{AF_FORMAT_A_LAW, PA_SAMPLE_ALAW},
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{AF_FORMAT_UNKNOWN, 0}
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};
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static int init(int rate_hz, int channels, int format, int flags) {
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struct pa_sample_spec ss;
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struct pa_channel_map map;
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const struct format_map_s *fmt_map;
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char *devarg = NULL;
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char *host = NULL;
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char *sink = NULL;
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const char *version = pa_get_library_version();
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if (ao_subdevice) {
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devarg = strdup(ao_subdevice);
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sink = strchr(devarg, ':');
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if (sink) *sink++ = 0;
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if (devarg[0]) host = devarg;
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}
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broken_pause = 0;
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// not sure which versions are affected, assume 0.9.11* to 0.9.14*
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// known bad: 0.9.14, 0.9.13
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// known good: 0.9.9, 0.9.10, 0.9.15
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// to test: pause, wait ca. 5 seconds framestep and see if MPlayer hangs somewhen
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if (strncmp(version, "0.9.1", 5) == 0 && version[5] >= '1' && version[5] <= '4') {
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mp_msg(MSGT_AO, MSGL_WARN, "[pulse] working around probably broken pause functionality,\n"
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" see http://www.pulseaudio.org/ticket/440\n");
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broken_pause = 1;
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}
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ss.channels = channels;
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ss.rate = rate_hz;
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ao_data.samplerate = rate_hz;
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ao_data.channels = channels;
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fmt_map = format_maps;
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while (fmt_map->mp_format != format) {
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if (fmt_map->mp_format == AF_FORMAT_UNKNOWN) {
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mp_msg(MSGT_AO, MSGL_V, "AO: [pulse] Unsupported format, using default\n");
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fmt_map = format_maps;
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break;
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}
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fmt_map++;
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}
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ao_data.format = fmt_map->mp_format;
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ss.format = fmt_map->pa_format;
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if (!pa_sample_spec_valid(&ss)) {
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Invalid sample spec\n");
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goto fail;
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}
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pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
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ao_data.bps = pa_bytes_per_second(&ss);
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if (!(mainloop = pa_threaded_mainloop_new())) {
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Failed to allocate main loop\n");
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goto fail;
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}
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if (!(context = pa_context_new(pa_threaded_mainloop_get_api(mainloop), PULSE_CLIENT_NAME))) {
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mp_msg(MSGT_AO, MSGL_ERR, "AO: [pulse] Failed to allocate context\n");
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goto fail;
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}
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pa_context_set_state_callback(context, context_state_cb, NULL);
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if (pa_context_connect(context, host, 0, NULL) < 0)
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goto fail;
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pa_threaded_mainloop_lock(mainloop);
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if (pa_threaded_mainloop_start(mainloop) < 0)
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goto unlock_and_fail;
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/* Wait until the context is ready */
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pa_threaded_mainloop_wait(mainloop);
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if (pa_context_get_state(context) != PA_CONTEXT_READY)
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goto unlock_and_fail;
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if (!(stream = pa_stream_new(context, "audio stream", &ss, &map)))
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goto unlock_and_fail;
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pa_stream_set_state_callback(stream, stream_state_cb, NULL);
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pa_stream_set_write_callback(stream, stream_request_cb, NULL);
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pa_stream_set_latency_update_callback(stream, stream_latency_update_cb, NULL);
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if (pa_stream_connect_playback(stream, sink, NULL, PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_AUTO_TIMING_UPDATE, NULL, NULL) < 0)
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goto unlock_and_fail;
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/* Wait until the stream is ready */
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pa_threaded_mainloop_wait(mainloop);
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if (pa_stream_get_state(stream) != PA_STREAM_READY)
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goto unlock_and_fail;
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pa_threaded_mainloop_unlock(mainloop);
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free(devarg);
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return 1;
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unlock_and_fail:
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if (mainloop)
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pa_threaded_mainloop_unlock(mainloop);
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fail:
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if (context)
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GENERIC_ERR_MSG(context, "Init failed");
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free(devarg);
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uninit(1);
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return 0;
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}
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/** Destroy libao driver */
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static void uninit(int immed) {
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if (stream && !immed) {
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pa_threaded_mainloop_lock(mainloop);
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waitop(pa_stream_drain(stream, success_cb, NULL));
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}
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if (mainloop)
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pa_threaded_mainloop_stop(mainloop);
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if (stream) {
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pa_stream_disconnect(stream);
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pa_stream_unref(stream);
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stream = NULL;
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}
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if (context) {
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pa_context_disconnect(context);
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pa_context_unref(context);
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context = NULL;
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}
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if (mainloop) {
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pa_threaded_mainloop_free(mainloop);
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mainloop = NULL;
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}
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}
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/** Play the specified data to the pulseaudio server */
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static int play(void* data, int len, int flags) {
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pa_threaded_mainloop_lock(mainloop);
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if (pa_stream_write(stream, data, len, NULL, 0, PA_SEEK_RELATIVE) < 0) {
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GENERIC_ERR_MSG(context, "pa_stream_write() failed");
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len = -1;
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}
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pa_threaded_mainloop_unlock(mainloop);
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return len;
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}
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static void cork(int b) {
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int success = 0;
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pa_threaded_mainloop_lock(mainloop);
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if (!waitop(pa_stream_cork(stream, b, success_cb, &success)) ||
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!success)
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GENERIC_ERR_MSG(context, "pa_stream_cork() failed");
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}
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/** Pause the audio stream by corking it on the server */
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static void audio_pause(void) {
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cork(1);
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}
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/** Resume the audio stream by uncorking it on the server */
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static void audio_resume(void) {
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// without this, certain versions will cause an infinite hang because
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// pa_stream_writable_size returns 0 always.
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// Note that this workaround causes A-V desync after pause
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if (broken_pause) reset();
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cork(0);
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}
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/** Reset the audio stream, i.e. flush the playback buffer on the server side */
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static void reset(void) {
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int success = 0;
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pa_threaded_mainloop_lock(mainloop);
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if (!waitop(pa_stream_flush(stream, success_cb, &success)) ||
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!success)
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GENERIC_ERR_MSG(context, "pa_stream_flush() failed");
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}
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/** Return number of bytes that may be written to the server without blocking */
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static int get_space(void) {
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size_t l;
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pa_threaded_mainloop_lock(mainloop);
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l = pa_stream_writable_size(stream);
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pa_threaded_mainloop_unlock(mainloop);
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return l;
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}
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/** Return the current latency in seconds */
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static float get_delay(void) {
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pa_usec_t latency = (pa_usec_t) -1;
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pa_threaded_mainloop_lock(mainloop);
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while (pa_stream_get_latency(stream, &latency, NULL) < 0) {
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if (pa_context_errno(context) != PA_ERR_NODATA) {
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GENERIC_ERR_MSG(context, "pa_stream_get_latency() failed");
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break;
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}
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/* Wait until latency data is available again */
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pa_threaded_mainloop_wait(mainloop);
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}
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pa_threaded_mainloop_unlock(mainloop);
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return latency == (pa_usec_t) -1 ? 0 : latency / 1000000.0;
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}
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/** A callback function that is called when the
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* pa_context_get_sink_input_info() operation completes. */
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static void info_func(struct pa_context *c, const struct pa_sink_input_info *i, int is_last, void *userdata) {
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struct pa_sink_input_info *pi = userdata;
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if (is_last < 0) {
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GENERIC_ERR_MSG(context, "Failed to get sink input info");
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return;
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}
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if (!i)
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return;
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*pi = *i;
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pa_threaded_mainloop_signal(mainloop, 0);
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}
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static int control(int cmd, void *arg) {
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switch (cmd) {
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case AOCONTROL_GET_MUTE: // fallthrough
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case AOCONTROL_GET_VOLUME: {
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struct pa_sink_input_info pi;
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ao_control_vol_t *vol = arg;
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uint32_t devidx = pa_stream_get_index(stream);
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pa_threaded_mainloop_lock(mainloop);
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if (!waitop(pa_context_get_sink_input_info(context, devidx, info_func, &pi))) {
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GENERIC_ERR_MSG(context, "pa_stream_get_sink_input_info() failed");
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return CONTROL_ERROR;
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}
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// Warning: some information in pi might be unaccessible, because
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// we naively copied the struct, without updating pointers etc.
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// Pointers might point to invalid data, accessors might fail.
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if (cmd == AOCONTROL_GET_VOLUME) {
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if (pi.volume.channels != 2)
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vol->left = vol->right = pa_cvolume_avg(&pi.volume)*100/PA_VOLUME_NORM;
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else {
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vol->left = pi.volume.values[0]*100/PA_VOLUME_NORM;
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vol->right = pi.volume.values[1]*100/PA_VOLUME_NORM;
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}
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} else if (cmd == AOCONTROL_GET_MUTE) {
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vol->left = vol->right = pi.mute ? 0.0f : 1.0f;
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}
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return CONTROL_OK;
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}
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case AOCONTROL_SET_MUTE: // fallthrough
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case AOCONTROL_SET_VOLUME: {
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const ao_control_vol_t *vol = arg;
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pa_operation *o;
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struct pa_cvolume volume;
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pa_cvolume_reset(&volume, ao_data.channels);
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if (volume.channels != 2)
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pa_cvolume_set(&volume, volume.channels, (pa_volume_t)vol->left*PA_VOLUME_NORM/100);
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else {
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volume.values[0] = (pa_volume_t)vol->left*PA_VOLUME_NORM/100;
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volume.values[1] = (pa_volume_t)vol->right*PA_VOLUME_NORM/100;
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}
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pa_threaded_mainloop_lock(mainloop);
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if (cmd == AOCONTROL_SET_VOLUME) {
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o = pa_context_set_sink_input_volume(context, pa_stream_get_index(stream), &volume, NULL, NULL);
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if (!o) {
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pa_threaded_mainloop_unlock(mainloop);
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GENERIC_ERR_MSG(context, "pa_context_set_sink_input_volume() failed");
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return CONTROL_ERROR;
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}
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} else if (cmd == AOCONTROL_SET_MUTE) {
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int mute = vol->left == 0.0f || vol->right == 0.0f;
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o = pa_context_set_sink_input_mute(context, pa_stream_get_index(stream), mute, NULL, NULL);
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if (!o) {
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pa_threaded_mainloop_unlock(mainloop);
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GENERIC_ERR_MSG(context, "pa_context_set_sink_input_mute() failed");
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return CONTROL_ERROR;
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}
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} else
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abort();
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/* We don't wait for completion here */
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pa_operation_unref(o);
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pa_threaded_mainloop_unlock(mainloop);
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return CONTROL_OK;
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}
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default:
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return CONTROL_UNKNOWN;
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}
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}
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