sndfile-play.c

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	audio_data = (MacOSXAudioData*) client_data ;

	size = data_out->mBuffers [0].mDataByteSize ;
	sample_count = size / sizeof (float) ;

	buffer = (float*) data_out->mBuffers [0].mData ;

	if (audio_data->fake_stereo != 0)
	{	read_count = sf_read_float (audio_data->sndfile, buffer, sample_count / 2) ;

		for (k = read_count - 1 ; k >= 0 ; k--)
		{	buffer [2 * k	] = buffer [k] ;
			buffer [2 * k + 1] = buffer [k] ;
			} ;
		read_count *= 2 ;
		}
	else
		read_count = sf_read_float (audio_data->sndfile, buffer, sample_count) ;

	/* Fill the remainder with zeroes. */
	if (read_count < sample_count)
	{	if (audio_data->fake_stereo == 0)
			memset (&(buffer [read_count]), 0, (sample_count - read_count) * sizeof (float)) ;
		/* Tell the main application to terminate. */
		audio_data->done_playing = SF_TRUE ;
		} ;

	return noErr ;
} /* macosx_audio_out_callback */

static void
macosx_play (int argc, char *argv [])
{	MacOSXAudioData 	audio_data ;
	OSStatus	err ;
	UInt32		count, buffer_size ;
	int 		k ;

	audio_data.fake_stereo = 0 ;
	audio_data.device = kAudioDeviceUnknown ;

	/*  get the default output device for the HAL */
	count = sizeof (AudioDeviceID) ;
	if ((err = AudioHardwareGetProperty (kAudioHardwarePropertyDefaultOutputDevice,
				&count, (void *) &(audio_data.device))) != noErr)
	{	printf ("AudioHardwareGetProperty (kAudioDevicePropertyDefaultOutputDevice) failed.\n") ;
		return ;
		} ;

	/*  get the buffersize that the default device uses for IO */
	count = sizeof (UInt32) ;
	if ((err = AudioDeviceGetProperty (audio_data.device, 0, false, kAudioDevicePropertyBufferSize,
				&count, &buffer_size)) != noErr)
	{	printf ("AudioDeviceGetProperty (kAudioDevicePropertyBufferSize) failed.\n") ;
		return ;
		} ;

	/*  get a description of the data format used by the default device */
	count = sizeof (AudioStreamBasicDescription) ;
	if ((err = AudioDeviceGetProperty (audio_data.device, 0, false, kAudioDevicePropertyStreamFormat,
				&count, &(audio_data.format))) != noErr)
	{	printf ("AudioDeviceGetProperty (kAudioDevicePropertyStreamFormat) failed.\n") ;
		return ;
		} ;

	/* Base setup completed. Now play files. */
	for (k = 1 ; k < argc ; k++)
	{	printf ("Playing %s\n", argv [k]) ;
		if (! (audio_data.sndfile = sf_open (argv [k], SFM_READ, &(audio_data.sfinfo))))
		{	puts (sf_strerror (NULL)) ;
			continue ;
			} ;

		if (audio_data.sfinfo.channels < 1 || audio_data.sfinfo.channels > 2)
		{	printf ("Error : channels = %d.\n", audio_data.sfinfo.channels) ;
			continue ;
			} ;

		audio_data.format.mSampleRate = audio_data.sfinfo.samplerate ;

		if (audio_data.sfinfo.channels == 1)
		{	audio_data.format.mChannelsPerFrame = 2 ;
			audio_data.fake_stereo = 1 ;
			}
		else
		audio_data.format.mChannelsPerFrame = audio_data.sfinfo.channels ;

		if ((err = AudioDeviceSetProperty (audio_data.device, NULL, 0, false, kAudioDevicePropertyStreamFormat,
					sizeof (AudioStreamBasicDescription), &(audio_data.format))) != noErr)
		{	printf ("AudioDeviceSetProperty (kAudioDevicePropertyStreamFormat) failed.\n") ;
			return ;
			} ;

		/*  we want linear pcm */
		if (audio_data.format.mFormatID != kAudioFormatLinearPCM)
			return ;

		/* Fire off the device. */
		if ((err = AudioDeviceAddIOProc (audio_data.device, macosx_audio_out_callback,
				(void *) &audio_data)) != noErr)
		{	printf ("AudioDeviceAddIOProc failed.\n") ;
			return ;
			} ;

		err = AudioDeviceStart (audio_data.device, macosx_audio_out_callback) ;
		if	(err != noErr)
			return ;

		audio_data.done_playing = SF_FALSE ;

		while (audio_data.done_playing == SF_FALSE)
			usleep (10 * 1000) ; /* 10 000 milliseconds. */

		if ((err = AudioDeviceStop (audio_data.device, macosx_audio_out_callback)) != noErr)
		{	printf ("AudioDeviceStop failed.\n") ;
			return ;
			} ;

		err = AudioDeviceRemoveIOProc (audio_data.device, macosx_audio_out_callback) ;
		if (err != noErr)
		{	printf ("AudioDeviceRemoveIOProc failed.\n") ;
			return ;
			} ;

		sf_close (audio_data.sndfile) ;
		} ;

	return ;
} /* macosx_play */

#endif /* MacOSX */


/*------------------------------------------------------------------------------
**	Win32 functions for playing a sound.
**
**	This API sucks. Its needlessly complicated and is *WAY* too loose with
**	passing pointers arounf in integers and and using char* pointers to
**  point to data instead of short*. It plain sucks!
*/

#if (OS_IS_WIN32 == 1)

#define	WIN32_BUFFER_LEN	(1<<15)

typedef struct
{	HWAVEOUT	hwave ;
	WAVEHDR		whdr [2] ;

	CRITICAL_SECTION	mutex ;		/* to control access to BuffersInUSe */
	HANDLE		Event ;			/* signal that a buffer is free */

	short		buffer [WIN32_BUFFER_LEN / sizeof (short)] ;
	int			current, bufferlen ;
	int			BuffersInUse ;

	SNDFILE 	*sndfile ;
	SF_INFO 	sfinfo ;

	sf_count_t	remaining ;
} Win32_Audio_Data ;


static void
win32_play_data (Win32_Audio_Data *audio_data)
{	int thisread, readcount ;

	/* fill a buffer if there is more data and we can read it sucessfully */
	readcount = (audio_data->remaining > audio_data->bufferlen) ? audio_data->bufferlen : (int) audio_data->remaining ;

	thisread = (int) sf_read_short (audio_data->sndfile, (short *) (audio_data->whdr [audio_data->current].lpData), readcount) ;

	audio_data->remaining -= thisread ;

	if (thisread > 0)
	{	/* Fix buffer length if this is only a partial block. */
		if (thisread < audio_data->bufferlen)
			audio_data->whdr [audio_data->current].dwBufferLength = thisread * sizeof (short) ;

		/* Queue the WAVEHDR */
		waveOutWrite (audio_data->hwave, (LPWAVEHDR) &(audio_data->whdr [audio_data->current]), sizeof (WAVEHDR)) ;

		/* count another buffer in use */
		EnterCriticalSection (&audio_data->mutex) ;
		audio_data->BuffersInUse ++ ;
		LeaveCriticalSection (&audio_data->mutex) ;

		/* use the other buffer next time */
		audio_data->current = (audio_data->current + 1) % 2 ;
		} ;

	return ;
} /* win32_play_data */

static void CALLBACK
win32_audio_out_callback (HWAVEOUT hwave, UINT msg, DWORD data, DWORD param1, DWORD param2)
{	Win32_Audio_Data	*audio_data ;

	/* Prevent compiler warnings. */
	hwave = hwave ;
	param1 = param2 ;

	if (data == 0)
		return ;

	/*
	** I consider this technique of passing a pointer via an integer as
	** fundamentally broken but thats the way microsoft has defined the
	** interface.
	*/
	audio_data = (Win32_Audio_Data*) data ;

	/* let main loop know a buffer is free */
	if (msg == MM_WOM_DONE)
	{	EnterCriticalSection (&audio_data->mutex) ;
		audio_data->BuffersInUse -- ;
		LeaveCriticalSection (&audio_data->mutex) ;
		SetEvent (audio_data->Event) ;
		} ;

	return ;
} /* win32_audio_out_callback */

/* This is needed for earlier versions of the M$ development tools. */
#ifndef DWORD_PTR
#define DWORD_PTR DWORD
#endif

static void
win32_play (int argc, char *argv [])
{	Win32_Audio_Data	audio_data ;

	WAVEFORMATEX wf ;
	int	k, error ;

	audio_data.sndfile = NULL ;
	audio_data.hwave = 0 ;

	for (k = 1 ; k < argc ; k++)
	{	printf ("Playing %s\n", argv [k]) ;

		if (! (audio_data.sndfile = sf_open (argv [k], SFM_READ, &(audio_data.sfinfo))))
		{	puts (sf_strerror (NULL)) ;
			continue ;
			} ;

		audio_data.remaining = audio_data.sfinfo.frames ;
		audio_data.current = 0 ;

		InitializeCriticalSection (&audio_data.mutex) ;
		audio_data.Event = CreateEvent (0, FALSE, FALSE, 0) ;

		wf.nChannels = audio_data.sfinfo.channels ;
		wf.wFormatTag = WAVE_FORMAT_PCM ;
		wf.cbSize = 0 ;
		wf.wBitsPerSample = 16 ;

		wf.nSamplesPerSec = audio_data.sfinfo.samplerate ;

		wf.nBlockAlign = audio_data.sfinfo.channels * sizeof (short) ;

		wf.nAvgBytesPerSec = wf.nBlockAlign * wf.nSamplesPerSec ;

		error = waveOutOpen (&(audio_data.hwave), WAVE_MAPPER, &wf, (DWORD_PTR) win32_audio_out_callback,
							(DWORD_PTR) &audio_data, CALLBACK_FUNCTION) ;
		if (error)
		{	puts ("waveOutOpen failed.") ;
			audio_data.hwave = 0 ;
			continue ;
			} ;

		audio_data.whdr [0].lpData = (char*) audio_data.buffer ;
		audio_data.whdr [1].lpData = ((char*) audio_data.buffer) + sizeof (audio_data.buffer) / 2 ;

		audio_data.whdr [0].dwBufferLength = sizeof (audio_data.buffer) / 2 ;
		audio_data.whdr [1].dwBufferLength = sizeof (audio_data.buffer) / 2 ;

		audio_data.whdr [0].dwFlags = 0 ;
		audio_data.whdr [1].dwFlags = 0 ;

		/* length of each audio buffer in samples */
		audio_data.bufferlen = sizeof (audio_data.buffer) / 2 / sizeof (short) ;

		/* Prepare the WAVEHDRs */
		if ((error = waveOutPrepareHeader (audio_data.hwave, &(audio_data.whdr [0]), sizeof (WAVEHDR))))
		{	printf ("waveOutPrepareHeader [0] failed : %08X\n", error) ;
			waveOutClose (audio_data.hwave) ;
			continue ;
			} ;

		if ((error = waveOutPrepareHeader (audio_data.hwave, &(audio_data.whdr [1]), sizeof (WAVEHDR))))
		{	printf ("waveOutPrepareHeader [1] failed : %08X\n", error) ;
			waveOutUnprepareHeader (audio_data.hwave, &(audio_data.whdr [0]), sizeof (WAVEHDR)) ;
			waveOutClose (audio_data.hwave) ;
			continue ;
			} ;

		/* Fill up both buffers with audio data */
		audio_data.BuffersInUse = 0 ;
		win32_play_data (&audio_data) ;
		win32_play_data (&audio_data) ;

		/* loop until both buffers are released */
		while (audio_data.BuffersInUse > 0)
		{
			/* wait for buffer to be released */
			WaitForSingleObject (audio_data.Event, INFINITE) ;

			/* refill the buffer if there is more data to play */
			win32_play_data (&audio_data) ;
			} ;

		waveOutUnprepareHeader (audio_data.hwave, &(audio_data.whdr [0]), sizeof (WAVEHDR)) ;
		waveOutUnprepareHeader (audio_data.hwave, &(audio_data.whdr [1]), sizeof (WAVEHDR)) ;

		waveOutClose (audio_data.hwave) ;
		audio_data.hwave = 0 ;

		DeleteCriticalSection (&audio_data.mutex) ;

		sf_close (audio_data.sndfile) ;
		} ;

} /* win32_play */

#endif /* Win32 */

/*------------------------------------------------------------------------------
**	Solaris.
*/

#if (defined (sun) && defined (unix)) /* ie Solaris */

static void
solaris_play (int argc, char *argv [])
{	static short 	buffer [BUFFER_LEN] ;
	audio_info_t	audio_info ;
	SNDFILE			*sndfile ;
	SF_INFO			sfinfo ;
	unsigned long	delay_time ;
	long			k, start_count, output_count, write_count, read_count ;
	int				audio_fd, error, done ;

	for (k = 1 ; k < argc ; k++)
	{	printf ("Playing %s\n", argv [k]) ;
		if (! (sndfile = sf_open (argv [k], SFM_READ, &sfinfo)))
		{	puts (sf_strerror (NULL)) ;
			continue ;
			} ;

		if (sfinfo.channels < 1 || sfinfo.channels > 2)
		{	printf ("Error : channels = %d.\n", sfinfo.channels) ;
			continue ;
			} ;

		/* open the audio device - write only, non-blocking */
		if ((audio_fd = open ("/dev/audio", O_WRONLY | O_NONBLOCK)) < 0)
		{	perror ("open (/dev/audio) failed") ;
			return ;
			} ;

		/*	Retrive standard values. */
		AUDIO_INITINFO (&audio_info) ;

		audio_info.play.sample_rate = sfinfo.samplerate ;
		audio_info.play.channels = sfinfo.channels ;
		audio_info.play.precision = 16 ;
		audio_info.play.encoding = AUDIO_ENCODING_LINEAR ;
		audio_info.play.gain = AUDIO_MAX_GAIN ;
		audio_info.play.balance = AUDIO_MID_BALANCE ;

		if ((error = ioctl (audio_fd, AUDIO_SETINFO, &audio_info)))
		{	perror ("ioctl (AUDIO_SETINFO) failed") ;
			return ;
			} ;

		/* Delay time equal to 1/4 of a buffer in microseconds. */
		delay_time = (BUFFER_LEN * 1000000) / (audio_info.play.sample_rate * 4) ;

		done = 0 ;
		while (! done)
		{	read_count = sf_read_short (sndfile, buffer, BUFFER_LEN) ;
			if (read_count < BUFFER_LEN)
			{	memset (&(buffer [read_count]), 0, (BUFFER_LEN - read_count) * sizeof (short)) ;
				/* Tell the main application to terminate. */
				done = SF_TRUE ;
				} ;

			start_count = 0 ;
			output_count = BUFFER_LEN * sizeof (short) ;

			while (output_count > 0)
			{	/* write as much data as possible */
				write_count = write (audio_fd, &(buffer [start_count]), output_count) ;
				if (write_count > 0)
				{	output_count -= write_count ;
					start_count += write_count ;
					}
				else
				{	/*	Give the audio output time to catch up. */
					usleep (delay_time) ;
					} ;
				} ; /* while (outpur_count > 0) */
			} ; /* while (! done) */

		close (audio_fd) ;
		} ;

	return ;
} /* solaris_play */

#endif /* Solaris */

/*==============================================================================
**	Main function.
*/

int
main (int argc, char *argv [])
{
	if (argc < 2)
	{
		printf ("\nUsage : %s <input sound file>\n\n", argv [0]) ;
#if (OS_IS_WIN32 == 1)
		printf ("This is a Unix style command line application which\n"
				"should be run in a MSDOS box or Command Shell window.\n\n") ;
		printf ("Sleeping for 5 seconds before exiting.\n\n") ;

		/* This is the officially blessed by microsoft way but I can't get
		** it to link.
		**     Sleep (15) ;
		** Instead, use this:
		*/
		_sleep (5 * 1000) ;
#endif
		return 1 ;
		} ;

#if defined (__linux__)
	#if HAVE_ALSA_ASOUNDLIB_H
		if (access ("/proc/asound/cards", R_OK) == 0)
			alsa_play (argc, argv) ;
		else
	#endif
		linux_play (argc, argv) ;
#elif (defined (__MACH__) && defined (__APPLE__))
	macosx_play (argc, argv) ;
#elif (defined (sun) && defined (unix))
	solaris_play (argc, argv) ;
#elif (OS_IS_WIN32 == 1)
	win32_play (argc, argv) ;
#elif defined (__BEOS__)
	printf ("This program cannot be compiled on BeOS.\n") ;
	printf ("Instead, compile the file sfplay_beos.cpp.\n") ;
	return 1 ;
#else
	puts ("*** Playing sound not yet supported on this platform.") ;
	puts ("*** Please feel free to submit a patch.") ;
	return 1 ;
#endif

	return 0 ;
} /* main */
/*
** Do not edit or modify anything in this comment block.
** The arch-tag line is a file identity tag for the GNU Arch
** revision control system.
**
** arch-tag: 8fc4110d-6cec-4e03-91df-0f384cabedac
*/