mpd/src/audioOutputs/audioOutput_mvp.c

/* the Music Player Daemon (MPD)
 * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
 * This project's homepage is: http://www.musicpd.org
 *
 * Media MVP audio output based on code from MVPMC project:
 * http://mvpmc.sourceforge.net/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "../audioOutput.h"

#include <stdlib.h>

#ifdef HAVE_MVP

#include "../conf.h"
#include "../log.h"
#include "../sig_handlers.h"

#include <string.h>
#include <assert.h>
#include <signal.h>

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

typedef struct {
	unsigned long dsp_status;
	unsigned long stream_decode_type;
	unsigned long sample_rate;
	unsigned long bit_rate;
	unsigned long raw[64/sizeof(unsigned long)];
} aud_status_t;

#define MVP_SET_AUD_STOP		_IOW('a',1,int)
#define MVP_SET_AUD_PLAY		_IOW('a',2,int)
#define MVP_SET_AUD_PAUSE	_IOW('a',3,int)
#define MVP_SET_AUD_UNPAUSE	_IOW('a',4,int)
#define MVP_SET_AUD_SRC		_IOW('a',5,int)
#define MVP_SET_AUD_MUTE		_IOW('a',6,int)
#define MVP_SET_AUD_BYPASS	_IOW('a',8,int)
#define MVP_SET_AUD_CHANNEL	_IOW('a',9,int)
#define MVP_GET_AUD_STATUS	_IOR('a',10,aud_status_t)
#define MVP_SET_AUD_VOLUME	_IOW('a',13,int)
#define MVP_GET_AUD_VOLUME	_IOR('a',14,int)
#define MVP_SET_AUD_STREAMTYPE	_IOW('a',15,int)
#define MVP_SET_AUD_FORMAT	_IOW('a',16,int)
#define MVP_GET_AUD_SYNC		_IOR('a',21,pts_sync_data_t*)
#define MVP_SET_AUD_STC		_IOW('a',22,long long int *)
#define MVP_SET_AUD_SYNC		_IOW('a',23,int)
#define MVP_SET_AUD_END_STREAM	_IOW('a',25,int)
#define MVP_SET_AUD_RESET	_IOW('a',26,int)
#define MVP_SET_AUD_DAC_CLK	_IOW('a',27,int)
#define MVP_GET_AUD_REGS		_IOW('a',28,aud_ctl_regs_t*)


typedef struct _MvpData {
	int fd;
} MvpData;

static int pcmfrequencies[][3] = {
              {9 ,8000 ,32000},
				  {10,11025,44100},
				  {11,12000,48000},
				  {1 ,16000,32000},
				  {2 ,22050,44100},
				  {3 ,24000,48000},
				  {5 ,32000,32000},
				  {0 ,44100,44100},
				  {7 ,48000,48000},
				  {13,64000,32000},
				  {14,88200,44100},
				  {15,96000,48000}};

static int numfrequencies = sizeof(pcmfrequencies)/12;

static int mvp_testDefault() {
	int fd;

	fd = open("/dev/adec_pcm", O_WRONLY);

	if(fd) {
		close(fd);
		return 0;
	}

	WARNING("Error opening PCM device \"/dev/adec_pcm\": %s\n",
			strerror(errno));

	return -1;
}

static int mvp_initDriver(AudioOutput * audioOutput, ConfigParam * param) {
	MvpData * md = malloc(sizeof(MvpData));
   md->fd = -1;
	audioOutput->data = md;

	return 0;
}

static void mvp_finishDriver(AudioOutput * audioOutput) {
   MvpData *md = audioOutput->data;
   free(md);
}

static int mvp_setPcmParams(MvpData *md, unsigned long rate, int channels, int big_endian, int bits){
   int iloop;
	int mix[5];

	if (channels == 1)
		mix[0] = 1;
	else if (channels == 2)
		mix[0] = 0;
	else
		return -1;

	/* 0,1=24bit(24) , 2,3=16bit */
	if (bits == 16)
		mix[1] = 2;
	else if (bits == 24)
		mix[1] = 0;
	else
		return -1;

	mix[3] = 0; /* stream type? */

	if (big_endian == 1)
		mix[4] = 1;
	else if (big_endian == 0)
		mix[4] = 0;
	else
		return -1;

	/*
	 * if there is an exact match for the frequency, use it.
	 */
	for(iloop = 0;iloop<numfrequencies;iloop++)
	{
		if(rate == pcmfrequencies[iloop][1])
		{
			mix[2] = pcmfrequencies[iloop][0];
			break;
		}
	}

	if (iloop >= numfrequencies) {
		ERROR("Can not find suitable output frequency for %ld\n",
			rate);
		return -1;
	}

	if (ioctl(md->fd, MVP_SET_AUD_FORMAT, &mix) < 0){
      ERROR("Can not set audio format\n");
		return -1;
   }
   
   if (ioctl(md->fd, MVP_SET_AUD_SYNC, 2) != 0){
      ERROR("Can not set audio sync\n");
		return -1;
   }

	if (ioctl(md->fd, MVP_SET_AUD_PLAY, 0) < 0){
      ERROR("Can not set audio play mode\n");
		return -1;
   }

	return 0;
}


static int mvp_openDevice(AudioOutput * audioOutput) 
{
   int ret = -1;
   MvpData * md = audioOutput->data;
   AudioFormat * audioFormat = &audioOutput->outAudioFormat;
   int mix[5] = { 0, 2, 7, 1, 0 };

   if ((md->fd=open("/dev/adec_pcm",
               O_RDWR|O_NONBLOCK)) < 0){
      ERROR("Error opening /dev/adec_pcm: %s\n", strerror(errno));
      return -1;
   }
   if (ioctl(md->fd, MVP_SET_AUD_SRC, 1) < 0){
      ERROR("Error setting audio source: %s\n", strerror(errno));
      return -1;
   }
   if (ioctl(md->fd, MVP_SET_AUD_STREAMTYPE, 0) < 0){
      ERROR("Error setting audio streamtype: %s\n", strerror(errno));
      return -1;
   }
   if (ioctl(md->fd, MVP_SET_AUD_FORMAT, &mix) < 0){
      ERROR("Error setting audio format: %s\n", strerror(errno));
      return -1;
   }
   long long int stc = 0;
   ioctl(md->fd, MVP_SET_AUD_STC, &stc);
   if (ioctl(md->fd, MVP_SET_AUD_BYPASS, 1) < 0){
      ERROR("Error setting audio streamtype: %s\n", strerror(errno));
      return -1;
   }
#ifdef WORDS_BIGENDIAN
   mvp_setPcmParams(md, audioFormat->sampleRate, audioFormat->channels, 0, audioFormat->bits);
#else
   mvp_setPcmParams(md, audioFormat->sampleRate, audioFormat->channels, 1, audioFormat->bits);
#endif
   audioOutput->open = 1;
   return 0;
}

static void mvp_closeDevice(AudioOutput * audioOutput) {
   MvpData * md = audioOutput->data;
   if(md->fd >= 0) close(md->fd);
	md->fd = -1;
   audioOutput->open = 0;
}

static void mvp_dropBufferedAudio(AudioOutput * audioOutput) {
   MvpData * md = audioOutput->data;
   if(md->fd >=0){
      ioctl(md->fd, MVP_SET_AUD_RESET, 0x11);
      close(md->fd);
      md->fd = -1;
      audioOutput->open = 0;
   }
}

static int mvp_playAudio(AudioOutput * audioOutput, char * playChunk, 
      int size) 
{
   MvpData * md = audioOutput->data;
   int ret;

   /* reopen the device since it was closed by dropBufferedAudio */
   if(md->fd < 0) mvp_openDevice(audioOutput);

   while (size > 0) {
      ret = write(md->fd, playChunk, size);
      if(ret<0) {
         if(errno == EINTR) continue;
         ERROR("closing mvp PCM device due to write error: "
               "%s\n", strerror(errno));
         mvp_closeDevice(audioOutput);
         return -1;
      }
      playChunk += ret;
      size -= ret;
   }
   return 0;
}

AudioOutputPlugin mvpPlugin =
{
   "mvp",
   mvp_testDefault,
   mvp_initDriver,
   mvp_finishDriver,
   mvp_openDevice,
   mvp_playAudio,
   mvp_dropBufferedAudio,
   mvp_closeDevice,
   NULL /* sendMetadataFunc */
};

#else /* HAVE_MVP */

AudioOutputPlugin mvpPlugin =
{
       NULL,
       NULL,
       NULL,
       NULL,
       NULL,
       NULL,
       NULL,
       NULL,
       NULL /* sendMetadataFunc */
};     

#endif /* HAVE_MVP */