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Diffstat (limited to 'drumgizmo/output/alsa/alsa.cc')
-rw-r--r-- | drumgizmo/output/alsa/alsa.cc | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/drumgizmo/output/alsa/alsa.cc b/drumgizmo/output/alsa/alsa.cc new file mode 100644 index 0000000..7b3a395 --- /dev/null +++ b/drumgizmo/output/alsa/alsa.cc @@ -0,0 +1,230 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/*************************************************************************** + * audiooutputenginedummy.cc + * + * Sat Apr 30 21:12:02 CEST 2011 + * Copyright 2011 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 <stdlib.h> + +#include <audiotypes.h> +#include <string> + +// Use the newer ALSA API +#define ALSA_PCM_NEW_HW_PARAMS_API + +#include <asoundlib.h> + +#define T(x, msg) if(x < 0) { printf("%s failed: %s\n", msg, snd_strerror(x)); fflush(stdout); return false; } + +#define BUFSZ 40960 + +class Alsa { +public: + Alsa(); + ~Alsa(); + bool init(int channels, char *cnames[]); + void setParm(std::string parm, std::string value); + bool start(); + void stop(); + void pre(size_t size); + void run(int channel, sample_t* data, size_t size); + void post(size_t size); + +private: + snd_pcm_t *handle; + snd_pcm_hw_params_t *params; + sample_t *data; + size_t channels; + + // Parameters + std::string device; + unsigned int srate; + snd_pcm_uframes_t frames; +}; + +Alsa::Alsa() +{ + handle = NULL; + data = NULL; + + device = "default"; + srate = 44100; + frames = 32; +} + +Alsa::~Alsa() +{ + if(handle) snd_pcm_close(handle); + if(data) free(data); +} + +bool Alsa::init(int channels, char *cnames[]) +{ + int rc; + + rc = snd_pcm_open(&handle, device.c_str(), SND_PCM_STREAM_PLAYBACK, 0); + T(rc, "snd_pcm_open"); + + this->channels = channels; + if(!handle) { + printf("No handle!\n"); + return false; + } + + // Allocate a hardware parameters object. + snd_pcm_hw_params_alloca(¶ms); + // 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_RW_INTERLEAVED); + 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); + 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"); + + data = (sample_t*)malloc(sizeof(sample_t) * BUFSZ * channels); + + return true; +} + +void Alsa::setParm(std::string parm, std::string value) +{ + if(parm == "dev") device = value; + if(parm == "frames") frames = atoi(value.c_str()); + if(parm == "srate") srate = atoi(value.c_str()); +} + +bool Alsa::start() +{ + return true; +} + +void Alsa::stop() +{ +} + +void Alsa::pre(size_t size) +{ +} + +void Alsa::run(int channel, sample_t* cdata, size_t csize) +{ + // Write channel data in interleaved buffer. + for(size_t i = 0; i < csize; i++) { + data[i * channels + channel] = cdata[i]; + } +} + +void Alsa::post(size_t size) +{ + // Write the interleaved buffer to the soundcard + snd_pcm_writei(handle, data, size); +} + +extern "C" { + void *create() + { + return new Alsa(); + } + + void destroy(void *h) + { + Alsa *alsa = (Alsa*)h; + delete alsa; + } + + bool init(void *h, int cs, char *cnames[]) + { + Alsa *alsa = (Alsa*)h; + return alsa->init(cs, cnames); + } + + void setparm(void *h, const char *parm, const char *value) + { + Alsa *alsa = (Alsa*)h; + alsa->setParm(parm, value); + } + + bool start(void *h) + { + Alsa *alsa = (Alsa*)h; + return alsa->start(); + } + + void stop(void *h) + { + Alsa *alsa = (Alsa*)h; + alsa->stop(); + } + + void pre(void *h, size_t s) + { + Alsa *alsa = (Alsa*)h; + alsa->pre(s); + } + + void run(void *h, int ch, sample_t *data, size_t size) + { + Alsa *alsa = (Alsa*)h; + alsa->run(ch, data, size); + } + + void post(void *h, size_t s) + { + Alsa *alsa = (Alsa*)h; + alsa->post(s); + } +} + +#ifdef TEST_AUDIOOUTPUTENGINEALSA +//Additional dependency files +//deps: +//Required cflags (autoconf vars may be used) +//cflags: +//Required link options (autoconf vars may be used) +//libs: +#include "test.h" + +TEST_BEGIN; + +// TODO: Put some testcode here (see test.h for usable macros). + +TEST_END; + +#endif/*TEST_AUDIOOUTPUTENGINEALSA*/ |