AudioSPDIF.h File Reference

S/PDIF output. More...

#include "AudioConfig.h"
#include "AudioTools/AudioLogger.h"
#include "AudioTools/AudioStreams.h"
#include "AudioI2S/I2SConfig.h"
#include "AudioI2S/I2SStream.h"

Go to the source code of this file.

Classes
struct	SPDIFConfig
	SPDIF configuration. More...
class	SPDIFOutput
	Output as 16 bit stereo SPDIF on the I2S data output pin. More...

Namespaces
	audio_tools
	Generic Implementation of sound input and output for desktop environments using portaudio.

Macros
#define	BMC_B   0x33173333
#define	BMC_BITS_FACTOR   (BMC_BITS_PER_SAMPLE / I2S_BITS_PER_SAMPLE)
#define	BMC_BITS_PER_SAMPLE   64
#define	BMC_M   0x331d3333
#define	BMC_MW_DIF   (BMC_M ^ BMC_W)
#define	BMC_W   0x331b3333
#define	DMA_BUF_COUNT   2
#define	DMA_BUF_LEN
#define	I2S_BITS_PER_SAMPLE   (32)
#define	I2S_BUG_MAGIC   (26 * 1000 * 1000)
#define	I2S_CHANNELS   2
#define	I2S_NUM   ((i2s_port_t)0)
#define	SPDIF_BLOCK_SAMPLES   192
#define	SPDIF_BLOCK_SIZE    (SPDIF_BLOCK_SAMPLES * (BMC_BITS_PER_SAMPLE / 8) * I2S_CHANNELS)
#define	SPDIF_BUF_ARRAY_SIZE   (SPDIF_BUF_SIZE / sizeof(uint32_t))
#define	SPDIF_BUF_DIV   2
#define	SPDIF_BUF_SIZE   (SPDIF_BLOCK_SIZE / SPDIF_BUF_DIV)
#define	SPDIF_DATA_PIN   23
#define	SYNC_FLIP   ((BMC_B ^ BMC_M) >> (SYNC_OFFSET * 8))
#define	SYNC_OFFSET   2

Typedefs
using	SPDIFStream = SPDIFOutput

Variables
static const int16_t *	bmc_tab = (int16_t *)bmc_tab_uint
static const uint16_t	bmc_tab_uint [256]
static uint32_t	spdif_buf [(((192 *(64/8) *2)/2)/sizeof(uint32_t))]
static uint32_t *	spdif_ptr = nullptr

Detailed Description

S/PDIF output.

Author

amedes / Phil Schatzmann

This example code is in the Public Domain (or CC0 licensed, at your option.) Unless required by applicable law or agreed to in writing, this software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

Date

2022-01-30

Copyright

(C) 2020 AMEDES, 2022 Phil Schatzmann

Macro Definition Documentation

DMA_BUF_LEN

#define DMA_BUF_LEN

Value:

  (SPDIF_BLOCK_SAMPLES * BMC_BITS_PER_SAMPLE / I2S_BITS_PER_SAMPLE / \
   SPDIF_BUF_DIV)