src/audio/netbsd/SDL_netbsdaudio.c - third_party/sdl - Git at Google

 /*
   Simple DirectMedia Layer
   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you must not
      claim that you wrote the original software. If you use this software
      in a product, an acknowledgment in the product documentation would be
      appreciated but is not required.
   2. Altered source versions must be plainly marked as such, and must not be
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
 #include "../../SDL_internal.h"

 #if SDL_AUDIO_DRIVER_NETBSD

 /*
  * Driver for native NetBSD audio(4).
  * nia@NetBSD.org
  */

 #include <errno.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/time.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/audioio.h>

 #include "SDL_timer.h"
 #include "SDL_audio.h"
 #include "../../core/unix/SDL_poll.h"
 #include "../SDL_audio_c.h"
 #include "../SDL_audiodev_c.h"
 #include "SDL_netbsdaudio.h"

 /* #define DEBUG_AUDIO */

 static void
 NETBSDAUDIO_DetectDevices(void)
 {
     SDL_EnumUnixAudioDevices(0, NULL);
 }


 static void
 NETBSDAUDIO_Status(_THIS)
 {
 #ifdef DEBUG_AUDIO
     /* *INDENT-OFF* */
     audio_info_t info;
     const struct audio_prinfo *prinfo;

     if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
         fprintf(stderr, "AUDIO_GETINFO failed.\n");
         return;
     }

     prinfo = this->iscapture ? &info.record : &info.play;

     fprintf(stderr, "\n"
             "[%s info]\n"
             "buffer size	:   %d bytes\n"
             "sample rate	:   %i Hz\n"
             "channels	:   %i\n"
             "precision	:   %i-bit\n"
             "encoding	:   0x%x\n"
             "seek		:   %i\n"
             "sample count	:   %i\n"
             "EOF count	:   %i\n"
             "paused		:   %s\n"
             "error occured	:   %s\n"
             "waiting		:   %s\n"
             "active		:   %s\n"
             "",
             this->iscapture ? "record" : "play",
             prinfo->buffer_size,
             prinfo->sample_rate,
             prinfo->channels,
             prinfo->precision,
             prinfo->encoding,
             prinfo->seek,
             prinfo->samples,
             prinfo->eof,
             prinfo->pause ? "yes" : "no",
             prinfo->error ? "yes" : "no",
             prinfo->waiting ? "yes" : "no",
             prinfo->active ? "yes" : "no");

     fprintf(stderr, "\n"
             "[audio info]\n"
             "monitor_gain	:   %i\n"
             "hw block size	:   %d bytes\n"
             "hi watermark	:   %i\n"
             "lo watermark	:   %i\n"
             "audio mode	:   %s\n"
             "",
             info.monitor_gain,
             info.blocksize,
             info.hiwat, info.lowat,
             (info.mode == AUMODE_PLAY) ? "PLAY"
             : (info.mode = AUMODE_RECORD) ? "RECORD"
             : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" : "?"));

     fprintf(stderr, "\n"
             "[audio spec]\n"
             "format		:   0x%x\n"
             "size		:   %u\n"
             "",
             this->spec.format,
             this->spec.size);
     /* *INDENT-ON* */
 #endif /* DEBUG_AUDIO */
 }


 static void
 NETBSDAUDIO_PlayDevice(_THIS)
 {
     struct SDL_PrivateAudioData *h = this->hidden;
     int written;

     /* Write the audio data */
     written = write(h->audio_fd, h->mixbuf, h->mixlen);
     if (written == -1) {
         /* Non recoverable error has occurred. It should be reported!!! */
         SDL_OpenedAudioDeviceDisconnected(this);
         perror("audio");
         return;
     }

 #ifdef DEBUG_AUDIO
     fprintf(stderr, "Wrote %d bytes of audio data\n", written);
 #endif
 }

 static Uint8 *
 NETBSDAUDIO_GetDeviceBuf(_THIS)
 {
     return (this->hidden->mixbuf);
 }


 static int
 NETBSDAUDIO_CaptureFromDevice(_THIS, void *_buffer, int buflen)
 {
     Uint8 *buffer = (Uint8 *) _buffer;
     int br;

     br = read(this->hidden->audio_fd, buffer, buflen);
     if (br == -1) {
         /* Non recoverable error has occurred. It should be reported!!! */
         perror("audio");
         return -1;
     }

 #ifdef DEBUG_AUDIO
     fprintf(stderr, "Captured %d bytes of audio data\n", br);
 #endif
     return 0;
 }

 static void
 NETBSDAUDIO_FlushCapture(_THIS)
 {
     audio_info_t info;
     size_t remain;
     Uint8 buf[512];

     if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
         return;  /* oh well. */
     }

     remain = (size_t) (info.record.samples * (SDL_AUDIO_BITSIZE(this->spec.format) / 8));
     while (remain > 0) {
         const size_t len = SDL_min(sizeof (buf), remain);
         const int br = read(this->hidden->audio_fd, buf, len);
         if (br <= 0) {
             return;  /* oh well. */
         }
         remain -= br;
     }
 }

 static void
 NETBSDAUDIO_CloseDevice(_THIS)
 {
     if (this->hidden->audio_fd >= 0) {
         close(this->hidden->audio_fd);
     }
     SDL_free(this->hidden->mixbuf);
     SDL_free(this->hidden);
 }

 static int
 NETBSDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
 {
     SDL_AudioFormat format = 0;
     audio_info_t info;
     struct audio_prinfo *prinfo = iscapture ? &info.record : &info.play;

     /* We don't care what the devname is...we'll try to open anything. */
     /*  ...but default to first name in the list... */
     if (devname == NULL) {
         devname = SDL_GetAudioDeviceName(0, iscapture);
         if (devname == NULL) {
             return SDL_SetError("No such audio device");
         }
     }

     /* Initialize all variables that we clean on shutdown */
     this->hidden = (struct SDL_PrivateAudioData *)
         SDL_malloc((sizeof *this->hidden));
     if (this->hidden == NULL) {
         return SDL_OutOfMemory();
     }
     SDL_zerop(this->hidden);

     /* Open the audio device */
     this->hidden->audio_fd = open(devname, iscapture ? O_RDONLY : O_WRONLY);
     if (this->hidden->audio_fd < 0) {
         return SDL_SetError("Couldn't open %s: %s", devname, strerror(errno));
     }

     AUDIO_INITINFO(&info);

     prinfo->encoding = AUDIO_ENCODING_NONE;

     for (format = SDL_FirstAudioFormat(this->spec.format); format;) {
         switch (format) {
         case AUDIO_U8:
             prinfo->encoding = AUDIO_ENCODING_ULINEAR;
             prinfo->precision = 8;
             break;
         case AUDIO_S8:
             prinfo->encoding = AUDIO_ENCODING_SLINEAR;
             prinfo->precision = 8;
             break;
         case AUDIO_S16LSB:
             prinfo->encoding = AUDIO_ENCODING_SLINEAR_LE;
             prinfo->precision = 16;
             break;
         case AUDIO_S16MSB:
             prinfo->encoding = AUDIO_ENCODING_SLINEAR_BE;
             prinfo->precision = 16;
             break;
         case AUDIO_U16LSB:
             prinfo->encoding = AUDIO_ENCODING_ULINEAR_LE;
             prinfo->precision = 16;
             break;
         case AUDIO_U16MSB:
             prinfo->encoding = AUDIO_ENCODING_ULINEAR_BE;
             prinfo->precision = 16;
             break;
         case AUDIO_S32LSB:
             prinfo->encoding = AUDIO_ENCODING_SLINEAR_LE;
             prinfo->precision = 32;
             break;
         case AUDIO_S32MSB:
             prinfo->encoding = AUDIO_ENCODING_SLINEAR_BE;
             prinfo->precision = 32;
             break;
         }
         if (prinfo->encoding != AUDIO_ENCODING_NONE) {
             break;
         }
         format = SDL_NextAudioFormat();
     }

     if (prinfo->encoding == AUDIO_ENCODING_NONE) {
         return SDL_SetError("No supported encoding for 0x%x", this->spec.format);
     }

     this->spec.format = format;

     /* Calculate spec parameters based on our chosen format */
     SDL_CalculateAudioSpec(&this->spec);

     info.mode = iscapture ? AUMODE_RECORD : AUMODE_PLAY;
     info.blocksize = this->spec.size;
     info.hiwat = 5;
     info.lowat = 3;
     prinfo->sample_rate = this->spec.freq;
     prinfo->channels = this->spec.channels;
     (void) ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info);

     (void) ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info);
     this->spec.freq = prinfo->sample_rate;
     this->spec.channels = prinfo->channels;

     if (!iscapture) {
         /* Allocate mixing buffer */
         this->hidden->mixlen = this->spec.size;
         this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen);
         if (this->hidden->mixbuf == NULL) {
             return SDL_OutOfMemory();
         }
         SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
     }

     NETBSDAUDIO_Status(this);

     /* We're ready to rock and roll. :-) */
     return 0;
 }

 static int
 NETBSDAUDIO_Init(SDL_AudioDriverImpl * impl)
 {
     /* Set the function pointers */
     impl->DetectDevices = NETBSDAUDIO_DetectDevices;
     impl->OpenDevice = NETBSDAUDIO_OpenDevice;
     impl->PlayDevice = NETBSDAUDIO_PlayDevice;
     impl->GetDeviceBuf = NETBSDAUDIO_GetDeviceBuf;
     impl->CloseDevice = NETBSDAUDIO_CloseDevice;
     impl->CaptureFromDevice = NETBSDAUDIO_CaptureFromDevice;
     impl->FlushCapture = NETBSDAUDIO_FlushCapture;

     impl->HasCaptureSupport = SDL_TRUE;
     impl->AllowsArbitraryDeviceNames = 1;

     return 1;   /* this audio target is available. */
 }


 AudioBootStrap NETBSDAUDIO_bootstrap = {
     "netbsd", "NetBSD audio", NETBSDAUDIO_Init, 0
 };

 #endif /* SDL_AUDIO_DRIVER_NETBSD */

 /* vi: set ts=4 sw=4 expandtab: */
	/*
	Simple DirectMedia Layer
	Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>

	This software is provided 'as-is', without any express or implied
	warranty. In no event will the authors be held liable for any damages
	arising from the use of this software.

	Permission is granted to anyone to use this software for any purpose,
	including commercial applications, and to alter it and redistribute it
	freely, subject to the following restrictions:

	1. The origin of this software must not be misrepresented; you must not
	claim that you wrote the original software. If you use this software
	in a product, an acknowledgment in the product documentation would be
	appreciated but is not required.
	2. Altered source versions must be plainly marked as such, and must not be
	misrepresented as being the original software.
	3. This notice may not be removed or altered from any source distribution.
	*/
	#include "../../SDL_internal.h"

	#if SDL_AUDIO_DRIVER_NETBSD

	/*
	* Driver for native NetBSD audio(4).
	* nia@NetBSD.org
	*/

	#include <errno.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <sys/time.h>
	#include <sys/ioctl.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/audioio.h>

	#include "SDL_timer.h"
	#include "SDL_audio.h"
	#include "../../core/unix/SDL_poll.h"
	#include "../SDL_audio_c.h"
	#include "../SDL_audiodev_c.h"
	#include "SDL_netbsdaudio.h"

	/* #define DEBUG_AUDIO */

	static void
	NETBSDAUDIO_DetectDevices(void)
	{
	SDL_EnumUnixAudioDevices(0, NULL);
	}


	static void
	NETBSDAUDIO_Status(_THIS)
	{
	#ifdef DEBUG_AUDIO
	/* INDENT-OFF */
	audio_info_t info;
	const struct audio_prinfo *prinfo;

	if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
	fprintf(stderr, "AUDIO_GETINFO failed.\n");
	return;
	}

	prinfo = this->iscapture ? &info.record : &info.play;

	fprintf(stderr, "\n"
	"[%s info]\n"
	"buffer size : %d bytes\n"
	"sample rate : %i Hz\n"
	"channels : %i\n"
	"precision : %i-bit\n"
	"encoding : 0x%x\n"
	"seek : %i\n"
	"sample count : %i\n"
	"EOF count : %i\n"
	"paused : %s\n"
	"error occured : %s\n"
	"waiting : %s\n"
	"active : %s\n"
	"",
	this->iscapture ? "record" : "play",
	prinfo->buffer_size,
	prinfo->sample_rate,
	prinfo->channels,
	prinfo->precision,
	prinfo->encoding,
	prinfo->seek,
	prinfo->samples,
	prinfo->eof,
	prinfo->pause ? "yes" : "no",
	prinfo->error ? "yes" : "no",
	prinfo->waiting ? "yes" : "no",
	prinfo->active ? "yes" : "no");

	fprintf(stderr, "\n"
	"[audio info]\n"
	"monitor_gain : %i\n"
	"hw block size : %d bytes\n"
	"hi watermark : %i\n"
	"lo watermark : %i\n"
	"audio mode : %s\n"
	"",
	info.monitor_gain,
	info.blocksize,
	info.hiwat, info.lowat,
	(info.mode == AUMODE_PLAY) ? "PLAY"
	: (info.mode = AUMODE_RECORD) ? "RECORD"
	: (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" : "?"));

	fprintf(stderr, "\n"
	"[audio spec]\n"
	"format : 0x%x\n"
	"size : %u\n"
	"",
	this->spec.format,
	this->spec.size);
	/* INDENT-ON */
	#endif /* DEBUG_AUDIO */
	}


	static void
	NETBSDAUDIO_PlayDevice(_THIS)
	{
	struct SDL_PrivateAudioData *h = this->hidden;
	int written;

	/* Write the audio data */
	written = write(h->audio_fd, h->mixbuf, h->mixlen);
	if (written == -1) {
	/* Non recoverable error has occurred. It should be reported!!! */
	SDL_OpenedAudioDeviceDisconnected(this);
	perror("audio");
	return;
	}

	#ifdef DEBUG_AUDIO
	fprintf(stderr, "Wrote %d bytes of audio data\n", written);
	#endif
	}

	static Uint8 *
	NETBSDAUDIO_GetDeviceBuf(_THIS)
	{
	return (this->hidden->mixbuf);
	}


	static int
	NETBSDAUDIO_CaptureFromDevice(_THIS, void *_buffer, int buflen)
	{
	Uint8 buffer = (Uint8 ) _buffer;
	int br;

	br = read(this->hidden->audio_fd, buffer, buflen);
	if (br == -1) {
	/* Non recoverable error has occurred. It should be reported!!! */
	perror("audio");
	return -1;
	}

	#ifdef DEBUG_AUDIO
	fprintf(stderr, "Captured %d bytes of audio data\n", br);
	#endif
	return 0;
	}

	static void
	NETBSDAUDIO_FlushCapture(_THIS)
	{
	audio_info_t info;
	size_t remain;
	Uint8 buf[512];

	if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
	return; /* oh well. */
	}

	remain = (size_t) (info.record.samples * (SDL_AUDIO_BITSIZE(this->spec.format) / 8));
	while (remain > 0) {
	const size_t len = SDL_min(sizeof (buf), remain);
	const int br = read(this->hidden->audio_fd, buf, len);
	if (br <= 0) {
	return; /* oh well. */
	}
	remain -= br;
	}
	}

	static void
	NETBSDAUDIO_CloseDevice(_THIS)
	{
	if (this->hidden->audio_fd >= 0) {
	close(this->hidden->audio_fd);
	}
	SDL_free(this->hidden->mixbuf);
	SDL_free(this->hidden);
	}

	static int
	NETBSDAUDIO_OpenDevice(_THIS, void handle, const char devname, int iscapture)
	{
	SDL_AudioFormat format = 0;
	audio_info_t info;
	struct audio_prinfo *prinfo = iscapture ? &info.record : &info.play;

	/* We don't care what the devname is...we'll try to open anything. */
	/* ...but default to first name in the list... */
	if (devname == NULL) {
	devname = SDL_GetAudioDeviceName(0, iscapture);
	if (devname == NULL) {
	return SDL_SetError("No such audio device");
	}
	}

	/* Initialize all variables that we clean on shutdown */
	this->hidden = (struct SDL_PrivateAudioData *)
	SDL_malloc((sizeof *this->hidden));
	if (this->hidden == NULL) {
	return SDL_OutOfMemory();
	}
	SDL_zerop(this->hidden);

	/* Open the audio device */
	this->hidden->audio_fd = open(devname, iscapture ? O_RDONLY : O_WRONLY);
	if (this->hidden->audio_fd < 0) {
	return SDL_SetError("Couldn't open %s: %s", devname, strerror(errno));
	}

	AUDIO_INITINFO(&info);

	prinfo->encoding = AUDIO_ENCODING_NONE;

	for (format = SDL_FirstAudioFormat(this->spec.format); format;) {
	switch (format) {
	case AUDIO_U8:
	prinfo->encoding = AUDIO_ENCODING_ULINEAR;
	prinfo->precision = 8;
	break;
	case AUDIO_S8:
	prinfo->encoding = AUDIO_ENCODING_SLINEAR;
	prinfo->precision = 8;
	break;
	case AUDIO_S16LSB:
	prinfo->encoding = AUDIO_ENCODING_SLINEAR_LE;
	prinfo->precision = 16;
	break;
	case AUDIO_S16MSB:
	prinfo->encoding = AUDIO_ENCODING_SLINEAR_BE;
	prinfo->precision = 16;
	break;
	case AUDIO_U16LSB:
	prinfo->encoding = AUDIO_ENCODING_ULINEAR_LE;
	prinfo->precision = 16;
	break;
	case AUDIO_U16MSB:
	prinfo->encoding = AUDIO_ENCODING_ULINEAR_BE;
	prinfo->precision = 16;
	break;
	case AUDIO_S32LSB:
	prinfo->encoding = AUDIO_ENCODING_SLINEAR_LE;
	prinfo->precision = 32;
	break;
	case AUDIO_S32MSB:
	prinfo->encoding = AUDIO_ENCODING_SLINEAR_BE;
	prinfo->precision = 32;
	break;
	}
	if (prinfo->encoding != AUDIO_ENCODING_NONE) {
	break;
	}
	format = SDL_NextAudioFormat();
	}

	if (prinfo->encoding == AUDIO_ENCODING_NONE) {
	return SDL_SetError("No supported encoding for 0x%x", this->spec.format);
	}

	this->spec.format = format;

	/* Calculate spec parameters based on our chosen format */
	SDL_CalculateAudioSpec(&this->spec);

	info.mode = iscapture ? AUMODE_RECORD : AUMODE_PLAY;
	info.blocksize = this->spec.size;
	info.hiwat = 5;
	info.lowat = 3;
	prinfo->sample_rate = this->spec.freq;
	prinfo->channels = this->spec.channels;
	(void) ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info);

	(void) ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info);
	this->spec.freq = prinfo->sample_rate;
	this->spec.channels = prinfo->channels;

	if (!iscapture) {
	/* Allocate mixing buffer */
	this->hidden->mixlen = this->spec.size;
	this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen);
	if (this->hidden->mixbuf == NULL) {
	return SDL_OutOfMemory();
	}
	SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
	}

	NETBSDAUDIO_Status(this);

	/* We're ready to rock and roll. :-) */
	return 0;
	}

	static int
	NETBSDAUDIO_Init(SDL_AudioDriverImpl * impl)
	{
	/* Set the function pointers */
	impl->DetectDevices = NETBSDAUDIO_DetectDevices;
	impl->OpenDevice = NETBSDAUDIO_OpenDevice;
	impl->PlayDevice = NETBSDAUDIO_PlayDevice;
	impl->GetDeviceBuf = NETBSDAUDIO_GetDeviceBuf;
	impl->CloseDevice = NETBSDAUDIO_CloseDevice;
	impl->CaptureFromDevice = NETBSDAUDIO_CaptureFromDevice;
	impl->FlushCapture = NETBSDAUDIO_FlushCapture;

	impl->HasCaptureSupport = SDL_TRUE;
	impl->AllowsArbitraryDeviceNames = 1;

	return 1; /* this audio target is available. */
	}


	AudioBootStrap NETBSDAUDIO_bootstrap = {
	"netbsd", "NetBSD audio", NETBSDAUDIO_Init, 0
	};

	#endif /* SDL_AUDIO_DRIVER_NETBSD */

	/* vi: set ts=4 sw=4 expandtab: */