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-rw-r--r--src/audiooutputenginealsa.cc194
1 files changed, 0 insertions, 194 deletions
diff --git a/src/audiooutputenginealsa.cc b/src/audiooutputenginealsa.cc
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-/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/***************************************************************************
- * audiooutputenginealsa.cc
- *
- * Thu Sep 16 11:22:52 CEST 2010
- * Copyright 2010 Bent Bisballe Nyeng
- * deva@aasimon.org
- ****************************************************************************/
-
-/*
- * This file is part of DrumGizmo.
- *
- * DrumGizmo 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.
- *
- * DrumGizmo 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 DrumGizmo; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- */
-#include "audiooutputenginealsa.h"
-
-#include "drumgizmo.h"
-
-#include <string>
-#include <math.h>
-#include <sys/time.h>
-
-#define T(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); return false; }
-#define T_(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); return; }
-
-AudioOutputEngineAlsa::AudioOutputEngineAlsa()
-{
- printf("AudioOutputEngineAlsa\n");
- int rc;
-
- std::string pcmname = "default";
-
- rc = snd_pcm_open(&handle, pcmname.c_str(),
- SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
- T_(rc, "snd_pcm_open");
-}
-
-AudioOutputEngineAlsa::~AudioOutputEngineAlsa()
-{
- printf("~AudioOutputEngineAlsa\n");
- if(handle) snd_pcm_close(handle);
-}
-
-bool AudioOutputEngineAlsa::init(Channels *channels)
-{
- this->channels = channels;
-
- if(!handle) {
- printf("No handle!\n");
- return false;
- }
-
- int rc;
- unsigned int srate = 44100;
- snd_pcm_uframes_t frames = 32;
-
- // Allocate a hardware parameters object.
- snd_pcm_hw_params_alloca(&params);
- // if(rc < 0) return false;
-
- // Fill it in with default values.
- rc = snd_pcm_hw_params_any(handle, params);
- T(rc, "snd_pcm_hw_params_any");
-
- rc = snd_pcm_hw_params_set_access(handle, params,
- SND_PCM_ACCESS_MMAP_NONINTERLEAVED);
- T(rc, "snd_pcm_hw_params_set_access");
-
- rc = snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_FLOAT);
- T(rc, "snd_pcm_hw_params_set_format");
-
- rc = snd_pcm_hw_params_set_channels(handle, params, channels->size());
- T(rc, "snd_pcm_hw_params_set_channels");
-
- rc = snd_pcm_hw_params_set_rate_near(handle, params, &srate, 0);
- T(rc, "snd_pcm_hw_params_set_rate_near");
-
- rc = snd_pcm_hw_params_set_period_size_near(handle, params, &frames, 0);
- T(rc, "snd_pcm_hw_params_set_period_size_near");
-
- rc = snd_pcm_hw_params(handle, params);
- T(rc, "snd_pcm_hw_params");
-
- // SW Params:
- /*
- rc = snd_pcm_sw_params_current(pcm, sw);
- rc = snd_pcm_sw_params_set_start_threshold(pcm, sw, ~0U);
- rc = snd_pcm_sw_params_set_stop_threshold(pcm, sw, ~0U);
- rc = snd_pcm_sw_params(pcm, sw);
- rc = snd_pcm_hw_params_get_buffer_size(hw, &buffer_size);
- */
-
- channels_t nchannels;
- rc = snd_pcm_hw_params_get_channels(params, &nchannels);
- printf("channels: %d rc: %d\n", nchannels, rc);
- T(rc, "snd_pcm_hw_params_get_channels");
- if(nchannels != channels->size()) return false;
-
- channel_t c = 0;
- Channels::iterator i = channels->begin();
- while(i != channels->end()) {
- i->num = c;
-
- i++;
- c++;
- }
-
- return true;
-}
-
-#define MICRO 1000000
-void AudioOutputEngineAlsa::run(DrumGizmo *drumgizmo)
-{
- int rc;
-
- snd_pcm_uframes_t nframes;
-
- while(drumgizmo->isRunning()) {
- timeval tim;
- gettimeofday(&tim, NULL);
- useconds_t t1 = tim.tv_sec * MICRO + tim.tv_usec;
-
- snd_pcm_uframes_t offset = 0;
-
- // unsigned int nchannels = 2;
- // rc = snd_pcm_hw_params_get_channels(params, &nchannels);
- // printf("channels: %d rc: %d\n", nchannels, rc);
- // T_(rc, "snd_pcm_hw_params_get_channels");
- nframes = snd_pcm_avail_update(handle);
- // printf("%d\n", rc);
- // T_(rc, "snd_pcm_avail_update");
-
- // rc = snd_pcm_hw_params_get_buffer_size(params, &nframes);
- // T_(rc, "nd_pcm_hw_params_get_buffer_size");
-
- // nframes = 960;
-
- const snd_pcm_channel_area_t *areas;
- rc = snd_pcm_mmap_begin(handle, &areas, &offset, &nframes);
- T_(rc, "snd_pcm_mmap_begin");
-
- drumgizmo->pre((size_t)nframes);
-
- Channels::iterator i = channels->begin();
- while(i != channels->end()) {
- const snd_pcm_channel_area_t *a = &areas[i->num];
- sample_t *p = (sample_t*)a->addr + offset;
- memset(p, 0, nframes * sizeof(sample_t));
- drumgizmo->getSamples(&(*i), p, (size_t)nframes);
-
- i++;
- }
- drumgizmo->post((size_t)nframes);
-
- switch(snd_pcm_state(handle)) {
- case SND_PCM_STATE_PREPARED:
- rc = snd_pcm_mmap_commit(handle, offset, nframes);
- T_(rc, "snd_pcm_mmap_commit");
- rc = snd_pcm_start(handle);
- T_(rc, "snd_pcm_start");
- break;
- case SND_PCM_STATE_RUNNING:
- rc = snd_pcm_mmap_commit(handle, offset, nframes);
- T_(rc, "snd_pcm_mmap_commit");
- break;
- default:
- break;
- }
-
- useconds_t msec = ((useconds_t)nframes * MICRO)/44100;
-
- gettimeofday(&tim, NULL);
- useconds_t t2 = tim.tv_sec * MICRO + tim.tv_usec;
-
- struct timespec slp;
- slp.tv_sec = 0;
- slp.tv_nsec = (msec - (t2 - t1)) * 1000;
-
- nanosleep(&slp, NULL);
-
- }
-}
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