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/* Libvisual-plugins - Standard plugins for libvisual
*
* Copyright (C) 2023 Sebastian Pipping <sebastian@pipping.org>
*
* Authors: Sebastian Pipping <sebastian@pipping.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program 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 Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdlib.h> // malloc
#include <libvisual/libvisual.h>
#include "gettext.h"
#include <portaudio.h>
VISUAL_PLUGIN_API_VERSION_VALIDATOR
#define SAMPLE_RATE 44100
#define SAMPLE_RATE_TYPE_LV VISUAL_AUDIO_SAMPLE_RATE_44100
#define SAMPLE_FORMAT_BITS 16
#define SAMPLE_FORMAT_PA paInt16
#define SAMPLE_FORMAT_LV VISUAL_AUDIO_SAMPLE_FORMAT_S16
#define FRAMES 1024
typedef struct {
PaStream *stream;
unsigned int channel_count; // 0 (unknown), 1 (mono) or 2 (stereo)
void * buffer;
} PortAudioPrivate;
static int inp_portaudio_init (VisPluginData *plugin);
static int inp_portaudio_cleanup (VisPluginData *plugin);
static int inp_portaudio_upload (VisPluginData *plugin, VisAudio *audio);
const VisPluginInfo *get_plugin_info (int *count)
{
static VisInputPlugin input[] = {{
.upload = inp_portaudio_upload
}};
static VisPluginInfo info[] = {{
.type = VISUAL_PLUGIN_TYPE_INPUT,
.plugname = "portaudio",
.name = "portaudio",
.author = "Sebastian Pipping <sebastian@pipping.org>",
.version = "1.0",
.about = N_("PortAudio capture plugin"),
.help = N_("Use this plugin to capture PCM data from the PortAudio record device"),
.license = VISUAL_PLUGIN_LICENSE_LGPL,
.init = inp_portaudio_init,
.cleanup = inp_portaudio_cleanup,
.plugin = VISUAL_OBJECT (&input[0])
}};
*count = sizeof (info) / sizeof (*info);
return info;
}
int inp_portaudio_init (VisPluginData *plugin)
{
#if ENABLE_NLS
bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
#endif
PortAudioPrivate * const priv = visual_mem_new0 (PortAudioPrivate, 1);
visual_log_return_val_if_fail(priv != NULL, -1);
visual_object_set_private (VISUAL_OBJECT (plugin), priv);
// Init PortAudio
const PaError init_error = Pa_Initialize();
visual_log_return_val_if_fail (init_error == paNoError, -2);
// Select input device
const PaDeviceIndex input_device = Pa_GetDefaultInputDevice ();
visual_log_return_val_if_fail (input_device != paNoDevice, -3);
// Open stream
// Try stereo first, fall back to mono as needed
priv->channel_count = 2; // i.e. stereo
const double latency_seconds = 1.0 / SAMPLE_RATE * FRAMES;
PaStreamParameters input_parameters = {
.device = input_device,
.channelCount = priv->channel_count,
.sampleFormat = SAMPLE_FORMAT_PA,
.suggestedLatency = latency_seconds,
.hostApiSpecificStreamInfo = NULL};
const PaError stereo_open_error =
Pa_OpenStream (&priv->stream, &input_parameters, NULL,
SAMPLE_RATE, FRAMES, paClipOff, NULL, NULL);
if (stereo_open_error != paNoError) {
if (stereo_open_error != paInvalidChannelCount) {
visual_log (VISUAL_LOG_CRITICAL,
"PortAudio: Could not open stereo input stream, error %d \"%s\".",
stereo_open_error, Pa_GetErrorText (stereo_open_error));
return -3;
}
// Try again with mono
assert(stereo_open_error == paInvalidChannelCount);
visual_log (VISUAL_LOG_INFO, "PortAudio: Could not open stereo input stream, trying again with mono.");
priv->channel_count = 1; // i.e. mono
input_parameters.channelCount = priv->channel_count;
const PaError mono_open_error =
Pa_OpenStream (&priv->stream, &input_parameters, NULL,
SAMPLE_RATE, FRAMES, paClipOff, NULL, NULL);
if (mono_open_error != paNoError) {
visual_log (VISUAL_LOG_CRITICAL,
"PortAudio: Could not open mono input stream, error %d \"%s\".",
mono_open_error, Pa_GetErrorText (mono_open_error));
return -3;
}
}
visual_log (VISUAL_LOG_INFO, "PortAudio: Input stream opened with %d channel(s).", priv->channel_count);
// Allocate buffer
const visual_size_t buffer_size_bytes = FRAMES * priv->channel_count * (SAMPLE_FORMAT_BITS / 8);
priv->buffer = malloc (buffer_size_bytes);
visual_log_return_val_if_fail (priv->buffer != NULL, -4);
// Start stream
const PaError input_start_error = Pa_StartStream (priv->stream);
visual_log_return_val_if_fail (input_start_error == paNoError, -5);
return 0;
}
int inp_portaudio_cleanup (VisPluginData *plugin)
{
visual_log_return_val_if_fail (plugin != NULL, -1);
PortAudioPrivate * const priv = visual_object_get_private (VISUAL_OBJECT (plugin));
visual_log_return_val_if_fail (priv != NULL, -2);
free (priv->buffer);
priv->buffer = NULL;
Pa_StopStream (priv->stream);
Pa_CloseStream (priv->stream);
priv->stream = NULL;
Pa_Terminate ();
visual_mem_free (priv);
return 0;
}
int inp_portaudio_upload (VisPluginData *plugin, VisAudio *audio)
{
visual_log_return_val_if_fail (plugin != NULL, -1);
visual_log_return_val_if_fail (audio != NULL, -2);
PortAudioPrivate * const priv = visual_object_get_private (VISUAL_OBJECT (plugin));
visual_log_return_val_if_fail (priv != NULL, -3);
visual_log_return_val_if_fail (priv->stream != NULL, -4);
for (;;) {
long frames_to_read = Pa_GetStreamReadAvailable (priv->stream);
if (frames_to_read < 1) {
return 0;
}
if (frames_to_read > FRAMES) {
frames_to_read = FRAMES; // because that's all that priv->buffer has space for
}
const PaError read_error = Pa_ReadStream(priv->stream, priv->buffer, frames_to_read);
if (read_error != paNoError) {
return 0;
}
const visual_size_t bytes_to_write = frames_to_read * priv->channel_count * (SAMPLE_FORMAT_BITS / 8);
VisBuffer buffer;
visual_buffer_init(&buffer, priv->buffer, bytes_to_write, NULL);
if (priv->channel_count == 2) {
visual_audio_samplepool_input(audio->samplepool, &buffer, SAMPLE_RATE_TYPE_LV,
SAMPLE_FORMAT_LV, VISUAL_AUDIO_SAMPLE_CHANNEL_STEREO);
} else {
assert(priv->channel_count == 1);
// Let's feed the same mono input to both the left and right channel.
// This helps actors plugins that call
// "visual_audio_get_sample ([..], [..], VISUAL_AUDIO_CHANNEL_RIGHT)"
// explicitly without checking return values.
const char * const channels[] = {
VISUAL_AUDIO_CHANNEL_LEFT,
VISUAL_AUDIO_CHANNEL_RIGHT
};
for (size_t i = 0; i < sizeof(channels) / sizeof(channels[0]); i++) {
visual_audio_samplepool_input_channel(audio->samplepool, &buffer, SAMPLE_RATE_TYPE_LV,
SAMPLE_FORMAT_LV, channels[i]);
}
}
}
// we never get here
}
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