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SDL2Bridge.hpp
265 lines (227 loc) · 8.9 KB
/
SDL2Bridge.hpp
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/*
* SDL Bridge for DPF
* Copyright (C) 2021-2023 Filipe Coelho <falktx@falktx.com>
*
* Permission to use, copy, modify, and/or distribute this software for any purpose with
* or without fee is hereby granted, provided that the above copyright notice and this
* permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
* TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef SDL_BRIDGE_HPP_INCLUDED
#define SDL_BRIDGE_HPP_INCLUDED
#include "NativeBridge.hpp"
#include "../../extra/ScopedDenormalDisable.hpp"
#include <SDL.h>
#ifndef SDL_HINT_AUDIO_DEVICE_APP_NAME
# define SDL_HINT_AUDIO_DEVICE_APP_NAME "SDL_AUDIO_DEVICE_APP_NAME"
#endif
#ifndef SDL_HINT_AUDIO_DEVICE_STREAM_NAME
# define SDL_HINT_AUDIO_DEVICE_STREAM_NAME "SDL_AUDIO_DEVICE_STREAM_NAME"
#endif
#if DISTRHO_PLUGIN_NUM_INPUTS+DISTRHO_PLUGIN_NUM_OUTPUTS == 0
# error SDL without audio does not make sense
#endif
struct SDL2Bridge : NativeBridge {
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
SDL_AudioDeviceID captureDeviceId;
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
SDL_AudioDeviceID playbackDeviceId;
#endif
SDL2Bridge()
: NativeBridge()
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
, captureDeviceId(0)
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
, playbackDeviceId(0)
#endif
{}
bool open(const char* const clientName) override
{
SDL_InitSubSystem(SDL_INIT_AUDIO);
SDL_AudioSpec requested;
std::memset(&requested, 0, sizeof(requested));
requested.format = AUDIO_F32SYS;
requested.freq = 48000;
requested.samples = 512;
requested.userdata = this;
SDL_SetHint(SDL_HINT_AUDIO_DEVICE_APP_NAME, clientName);
// SDL_SetHint(SDL_HINT_AUDIO_RESAMPLING_MODE, "1");
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
SDL_SetHint(SDL_HINT_AUDIO_DEVICE_STREAM_NAME, "Capure");
requested.channels = DISTRHO_PLUGIN_NUM_INPUTS_2;
requested.callback = AudioInputCallback;
SDL_AudioSpec receivedCapture;
captureDeviceId = SDL_OpenAudioDevice(nullptr, 1, &requested, &receivedCapture,
SDL_AUDIO_ALLOW_FREQUENCY_CHANGE|SDL_AUDIO_ALLOW_SAMPLES_CHANGE);
if (captureDeviceId == 0)
{
d_stderr2("Failed to open SDL capture device, error was: %s", SDL_GetError());
#if DISTRHO_PLUGIN_NUM_OUTPUTS == 0
return false;
#endif
}
else if (receivedCapture.channels != DISTRHO_PLUGIN_NUM_INPUTS_2)
{
SDL_CloseAudioDevice(captureDeviceId);
captureDeviceId = 0;
d_stderr2("Invalid or missing audio input channels");
return false;
}
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
SDL_AudioSpec receivedPlayback;
SDL_SetHint(SDL_HINT_AUDIO_DEVICE_STREAM_NAME, "Playback");
requested.channels = DISTRHO_PLUGIN_NUM_OUTPUTS_2;
requested.callback = AudioOutputCallback;
playbackDeviceId = SDL_OpenAudioDevice(nullptr, 0, &requested, &receivedPlayback,
SDL_AUDIO_ALLOW_FREQUENCY_CHANGE|SDL_AUDIO_ALLOW_SAMPLES_CHANGE);
if (playbackDeviceId == 0)
{
d_stderr2("Failed to open SDL playback device, error was: %s", SDL_GetError());
return false;
}
if (receivedPlayback.channels != DISTRHO_PLUGIN_NUM_OUTPUTS_2)
{
SDL_CloseAudioDevice(playbackDeviceId);
playbackDeviceId = 0;
d_stderr2("Invalid or missing audio output channels");
return false;
}
#endif
#if DISTRHO_PLUGIN_NUM_INPUTS > 0 && DISTRHO_PLUGIN_NUM_OUTPUTS > 0
// if using both input and output, make sure they match
if (receivedCapture.samples != receivedPlayback.samples && captureDeviceId != 0)
{
SDL_CloseAudioDevice(captureDeviceId);
SDL_CloseAudioDevice(playbackDeviceId);
captureDeviceId = playbackDeviceId = 0;
d_stderr2("Mismatch buffer size %u vs %u", receivedCapture.samples, receivedPlayback.samples);
return false;
}
if (receivedCapture.freq != receivedPlayback.freq && captureDeviceId != 0)
{
SDL_CloseAudioDevice(captureDeviceId);
SDL_CloseAudioDevice(playbackDeviceId);
captureDeviceId = playbackDeviceId = 0;
d_stderr2("Mismatch sample rate %u vs %u", receivedCapture.freq, receivedPlayback.freq);
return false;
}
#endif
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
if (captureDeviceId != 0)
{
bufferSize = receivedCapture.samples;
sampleRate = receivedCapture.freq;
}
#endif
#if DISTRHO_PLUGIN_NUM_INPUTS > 0 && DISTRHO_PLUGIN_NUM_OUTPUTS > 0
else
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
{
bufferSize = receivedPlayback.samples;
sampleRate = receivedPlayback.freq;
}
#endif
allocBuffers(true, false);
return true;
}
bool close() override
{
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
if (captureDeviceId != 0)
{
SDL_CloseAudioDevice(captureDeviceId);
captureDeviceId = 0;
}
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
DISTRHO_SAFE_ASSERT_RETURN(playbackDeviceId != 0, false);
SDL_CloseAudioDevice(playbackDeviceId);
playbackDeviceId = 0;
#endif
freeBuffers();
return true;
}
bool activate() override
{
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
if (captureDeviceId != 0)
SDL_PauseAudioDevice(captureDeviceId, 0);
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
DISTRHO_SAFE_ASSERT_RETURN(playbackDeviceId != 0, false);
SDL_PauseAudioDevice(playbackDeviceId, 0);
#endif
return true;
}
bool deactivate() override
{
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
if (captureDeviceId != 0)
SDL_PauseAudioDevice(captureDeviceId, 1);
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
DISTRHO_SAFE_ASSERT_RETURN(playbackDeviceId != 0, false);
SDL_PauseAudioDevice(playbackDeviceId, 1);
#endif
return true;
}
#if DISTRHO_PLUGIN_NUM_INPUTS > 0
static void AudioInputCallback(void* const userData, uchar* const stream, const int len)
{
NativeBridge* const self = static_cast<NativeBridge*>(userData);
// safety checks
DISTRHO_SAFE_ASSERT_RETURN(stream != nullptr,);
DISTRHO_SAFE_ASSERT_RETURN(len > 0,);
if (self->jackProcessCallback == nullptr)
return;
const uint numFrames = static_cast<uint>(len / sizeof(float) / DISTRHO_PLUGIN_NUM_INPUTS_2);
DISTRHO_SAFE_ASSERT_UINT2_RETURN(numFrames == self->bufferSize, numFrames, self->bufferSize,);
const float* const fstream = (const float*)stream;
for (uint i=0; i<DISTRHO_PLUGIN_NUM_INPUTS_2; ++i)
{
for (uint j=0; j<numFrames; ++j)
self->audioBuffers[i][j] = fstream[j * DISTRHO_PLUGIN_NUM_INPUTS_2 + i];
}
#if DISTRHO_PLUGIN_NUM_OUTPUTS == 0
// if there are no outputs, run process callback now
const ScopedDenormalDisable sdd;
self->jackProcessCallback(numFrames, self->jackProcessArg);
#endif
}
#endif
#if DISTRHO_PLUGIN_NUM_OUTPUTS > 0
static void AudioOutputCallback(void* const userData, uchar* const stream, const int len)
{
NativeBridge* const self = static_cast<NativeBridge*>(userData);
// safety checks
DISTRHO_SAFE_ASSERT_RETURN(stream != nullptr,);
DISTRHO_SAFE_ASSERT_RETURN(len > 0,);
if (self->jackProcessCallback == nullptr)
{
std::memset(stream, 0, len);
return;
}
const uint numFrames = static_cast<uint>(len / sizeof(float) / DISTRHO_PLUGIN_NUM_OUTPUTS_2);
DISTRHO_SAFE_ASSERT_UINT2_RETURN(numFrames == self->bufferSize, numFrames, self->bufferSize,);
const ScopedDenormalDisable sdd;
self->jackProcessCallback(numFrames, self->jackProcessArg);
float* const fstream = (float*)stream;
for (uint i=0; i < DISTRHO_PLUGIN_NUM_OUTPUTS_2; ++i)
{
for (uint j=0; j < numFrames; ++j)
fstream[j * DISTRHO_PLUGIN_NUM_OUTPUTS_2 + i] = self->audioBuffers[DISTRHO_PLUGIN_NUM_INPUTS + i][j];
}
}
#endif
};
#endif // SDL_BRIDGE_HPP_INCLUDED