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/*
* Copyright (C) 2022 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2022 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-units
* Created on: 24 нояб. 2022 г.
*
* lsp-dsp-units 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 3 of the License, or
* any later version.
*
* lsp-dsp-units 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-units. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_DSP_UNITS_SAMPLING_HELPERS_PLAYBACK_H_
#define LSP_PLUG_IN_DSP_UNITS_SAMPLING_HELPERS_PLAYBACK_H_
#include <lsp-plug.in/dsp-units/version.h>
#include <lsp-plug.in/common/types.h>
#include <lsp-plug.in/dsp-units/iface/IStateDumper.h>
#include <lsp-plug.in/dsp-units/sampling/helpers/batch.h>
#include <lsp-plug.in/dsp-units/sampling/types.h>
#include <lsp-plug.in/dsp-units/sampling/Sample.h>
#include <lsp-plug.in/dsp-units/sampling/PlaySettings.h>
namespace lsp
{
namespace dspu
{
namespace playback
{
/**
* The actual state of the playback of the sample
*/
enum playback_state_t
{
STATE_NONE, // No active state
STATE_PLAY, // Regular play
STATE_STOP, // Playback till the end of the sample, do not loop
STATE_CANCEL // Immediately cancel the playback
};
/**
* Low-level data structure that holds the state of the finite machine
* that introduces the playback of the single sample
*/
typedef struct playback_t
{
wsize_t nTimestamp; // The actual playback timestamp in stamples
wsize_t nCancelTime; // The actual cancel timestamp
Sample *pSample; // Pointer to the sample
size_t nSerial; // Serial version of playback object
ssize_t nID; // ID of instrument
size_t nChannel; // Channel to play
playback_state_t enState; // State of the playback
float fVolume; // The volume of the sample
bool bReverse; // The reverse playback flag
ssize_t nPosition; // Current playback position
size_t nFadeout; // Fadeout length for cancelling
sample_loop_t enLoopMode; // Loop mode
size_t nLoopStart; // Start of the loop
size_t nLoopEnd; // End of the loop
size_t nXFade; // The crossfade time in stamples
sample_crossfade_t enXFadeType; // The crossfade type
play_batch_t sBatch[2]; // Batch queue for execution
} playback_t;
LSP_DSP_UNITS_PUBLIC
void compute_initial_batch(playback_t *pb, const PlaySettings *settings);
LSP_DSP_UNITS_PUBLIC
void compute_next_batch(playback_t *pb);
LSP_DSP_UNITS_PUBLIC
void recompute_next_batch(playback_t *pb);
LSP_DSP_UNITS_PUBLIC
void complete_current_batch(playback_t *pb);
LSP_DSP_UNITS_PUBLIC
size_t execute_batch(float *dst, const batch_t *b, playback_t *pb, size_t samples);
LSP_DSP_UNITS_PUBLIC
size_t apply_fade_out(float *dst, playback_t *pb, size_t samples);
LSP_DSP_UNITS_PUBLIC
void clear_playback(playback_t *pb);
LSP_DSP_UNITS_PUBLIC
void reset_playback(playback_t *pb);
LSP_DSP_UNITS_PUBLIC
void start_playback(playback_t *pb, Sample *sample, const PlaySettings *settings);
LSP_DSP_UNITS_PUBLIC
size_t process_playback(float *dst, playback_t *pb, size_t samples);
LSP_DSP_UNITS_PUBLIC
void stop_playback(playback_t *pb, size_t delay = 0);
LSP_DSP_UNITS_PUBLIC
bool cancel_playback(playback_t *pb, size_t fadeout = 0, size_t delay = 0);
LSP_DSP_UNITS_PUBLIC
void dump_playback_plain(IStateDumper *v, const playback_t *pb);
LSP_DSP_UNITS_PUBLIC
void dump_playback(IStateDumper *v, const playback_t *pb);
LSP_DSP_UNITS_PUBLIC
void dump_playback(IStateDumper *v, const char *name, const playback_t *pb);
} /* namespace playback */
} /* namespace dspu */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_DSP_UNITS_SAMPLING_HELPERS_PLAYBACK_H_ */
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