c06c6ffa81
Add basic sample rate conversion to the CXD56 Spresense audio driver using libsamplerate. Currently conversion is only done during playback and all output is fixed at 48 kHz. Issues: - 16 kHz SRC has glitches (unless data dump is enabled) - 44.1 kHz SRC gets stuck Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
121 lines
4.0 KiB
C
121 lines
4.0 KiB
C
/****************************************************************************
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* drivers/audio/cxd56_src.h
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*
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* Copyright 2020 Sony Semiconductor Solutions Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __DRIVERS_AUDIO_CXD56_SRC_H
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#define __DRIVERS_AUDIO_CXD56_SRC_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <pthread.h>
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#include <mqueue.h>
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#include <nuttx/audio/audio.h>
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#include <nuttx/config.h>
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#ifdef CONFIG_AUDIO
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_CXD56_AUDIO_SRC_STACKSIZE
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# define CONFIG_CXD56_AUDIO_SRC_STACKSIZE 768
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#endif
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#ifndef CONFIG_CXD56_SRC_MSG_PRIO
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# define CONFIG_CXD56_SRC_MSG_PRIO 1
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#endif
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#ifndef SRC_SINC_BEST_QUALITY
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# define SRC_SINC_BEST_QUALITY 0
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#endif
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#ifndef SRC_SINC_MEDIUM_QUALITY
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# define SRC_SINC_MEDIUM_QUALITY 1
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#endif
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#ifndef SRC_SINC_FASTEST
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# define SRC_SINC_FASTEST 2
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#endif
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#ifndef SRC_ZERO_ORDER_HOLD
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# define SRC_ZERO_ORDER_HOLD 3
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#endif
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#ifndef SRC_LINEAR
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# define SRC_LINEAR 4
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#endif
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#define AUDIO_APB_SRC_FINAL (1 << 4) /* Last buffer in SRC processing */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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typedef struct SRC_STATE_TAG SRC_STATE;
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typedef struct
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{
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const float *data_in;
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float *data_out;
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long input_frames;
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long output_frames;
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long input_frames_used;
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long output_frames_gen;
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int end_of_input;
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double src_ratio;
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} SRC_DATA;
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SRC_STATE *src_new (int converter_type, int channels, int *error);
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SRC_STATE *src_delete (SRC_STATE *state);
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int src_process (SRC_STATE *state, SRC_DATA *data);
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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int cxd56_src_init(FAR struct cxd56_dev_s *dev, FAR struct dq_queue_s *inq,
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FAR struct dq_queue_s *outq);
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int cxd56_src_deinit(void);
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int cxd56_src_enqueue(FAR struct ap_buffer_s *apb);
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int cxd56_src_stop(void);
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#endif /* CONFIG_AUDIO */
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#endif /* __DRIVERS_AUDIO_CXD56_SRC_H */
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