159 lines
4.0 KiB
C
159 lines
4.0 KiB
C
/*
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* simpleaudio-pulse.c
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*
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* Copyright (C) 2011-2012 Kamal Mostafa <kamal@whence.com>
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*
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* This program 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 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#if USE_PULSEAUDIO
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <pulse/simple.h>
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#include <pulse/error.h>
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#include <pulse/gccmacro.h>
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#include "simpleaudio.h"
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#include "simpleaudio_internal.h"
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/*
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* pulseaudio[pa_simple] backend for simpleaudio
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*/
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static ssize_t
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sa_pulse_read( simpleaudio *sa, void *buf, size_t nframes )
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{
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int error;
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pa_simple *s = (pa_simple *)sa->backend_handle;
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size_t nbytes = nframes * sa->backend_framesize;
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/* N.B. pa_simple_read always returns 0 or -1, not the number of
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* read bytes!*/
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if (pa_simple_read(s, buf, nbytes, &error) < 0) {
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fprintf(stderr, "pa_simple_read: %s\n", pa_strerror(error));
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return -1;
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}
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return nframes;
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}
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static ssize_t
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sa_pulse_write( simpleaudio *sa, void *buf, size_t nframes )
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{
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int error;
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pa_simple *s = (pa_simple *)sa->backend_handle;
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size_t nbytes = nframes * sa->backend_framesize;
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/* ????? N.B. pa_simple_write always returns 0 or -1, not the number of
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* written bytes!*/
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if (pa_simple_write(s, buf, nbytes, &error) < 0) {
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fprintf(stderr, "pa_simple_write: %s\n", pa_strerror(error));
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return -1;
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}
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return nframes;
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}
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static void
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sa_pulse_close( simpleaudio *sa )
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{
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pa_simple_drain(sa->backend_handle, NULL);
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pa_simple_free(sa->backend_handle);
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}
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static int
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sa_pulse_open_stream(
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simpleaudio *sa,
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const char *backend_device,
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sa_direction_t sa_stream_direction,
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sa_format_t sa_format,
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unsigned int rate, unsigned int channels,
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char *app_name, char *stream_name )
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{
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int error;
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// FIXME - use source for something
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// just take the default pulseaudio source for now
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pa_sample_format_t pa_format;
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switch ( sa->format ) {
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case SA_SAMPLE_FORMAT_FLOAT:
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pa_format = PA_SAMPLE_FLOAT32;
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break;
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case SA_SAMPLE_FORMAT_S16:
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pa_format = PA_SAMPLE_S16LE; // FIXME: handle S16BE
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break;
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default:
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assert(0);
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}
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/* The sample type to use */
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pa_sample_spec ss = {
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.format = pa_format,
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.rate = rate,
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.channels = channels,
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};
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pa_buffer_attr attr = {
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.maxlength = (uint32_t)-1,
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.tlength = (uint32_t)-1,
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.prebuf = (uint32_t)-1,
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.minreq = (uint32_t)-1,
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.fragsize = (uint32_t)-1,
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};
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attr.fragsize = 0; /* set for lowest possible capture latency */
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attr.tlength = 0; /* set lowest possible playback latency */
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// Do not mess with attr.prebuf! Setting it =1 causes some playback (--tx)
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// sessions to be wiped out by noise (I do not know why).
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/* Create the playback or recording stream */
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pa_simple *s;
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s = pa_simple_new(NULL, app_name,
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sa_stream_direction == SA_STREAM_RECORD ? PA_STREAM_RECORD : PA_STREAM_PLAYBACK,
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NULL, stream_name,
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&ss, NULL, &attr, &error);
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if ( !s ) {
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fprintf(stderr, "E: Cannot create PulseAudio stream: %s\n ", pa_strerror(error));
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return 0;
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}
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/* good or bad to override these? */
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sa->rate = ss.rate;
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sa->channels = ss.channels;
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sa->backend_handle = s;
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sa->backend_framesize = pa_frame_size(&ss);
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return 1;
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}
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const struct simpleaudio_backend simpleaudio_backend_pulseaudio = {
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sa_pulse_open_stream,
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sa_pulse_read,
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sa_pulse_write,
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sa_pulse_close,
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};
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#endif /* USE_PULSEAUDIO */
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