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request : working sbl pcm player function
vbt - Oct 13, 2006
  vbt Oct 13, 2006
if somebody can help, I'd like a simple and working sample to play a waveform file or buffer

 vbt Nov 7, 2006
Request cancelled, I did it myself

 RockinB Nov 12, 2006

vbt said:
Request cancelled, I did it myself


Due to the limitations of SGL PCM playback and because the SBL sound playback functions can be used together with SGL, the pcm player demo you mentioned is very interesting.

I'm thinking about MOD players and custom ADPCM (MP3, OGG, what ever) decoders. A MOD player is something we'd need as urgent as an SDL port. Now that you managed to output sound with an emu on Saturn, the same approach can be used for a MOD player. Can you release the source code of the SBL pcm player demo?

 vbt Nov 18, 2006

RockinB said:
Due to the limitations of SGL PCM playback and because the SBL sound playback functions can be used together with SGL, the pcm player demo you mentioned is very interesting.


I'm thinking about MOD players and custom ADPCM (MP3, OGG, what ever) decoders. A MOD player is something we'd need as urgent as an SDL port. Now that you managed to output sound with an emu on Saturn, the same approach can be used for a MOD player. Can you release the source code of the SBL pcm player demo?



In fact the sound of the sms is converted to wave so I didn't develop my own function to play sound and the function used to read wave in SBL is pcm_AudioMix. I haven't developed a sound player sample but I can give what I did for sound playing from memory :


Code: 
  
#include "sega_pcm.h"

#include "sega_snd.h"

...


#define	RING_BUF_SIZE	(2048L*10)

#define	PCM_ADDR	((void*)0x25a20000)

#define	PCM_SIZE	(4096L*2)	

Sint8 *g_movie_buf = (Sint8 *)0x25a20000;


PcmHn pcm;

int delta;

int frame;

...

void	UsrVblankIn( void )

{

	PCM_MeVblIn();

}


static void sndInit(void)

{

	SndIniDt 	snd_init;

	char sound_map[]={0xFF,0xFF};


#ifndef ACTION_REPLAY

	GFS_Load(GFS_NameToId(SDDRV_NAME),0,(void *) SDDRV_ADDR,SDDRV_SIZE);

	SND_INI_PRG_ADR(snd_init) = (Uint16 *)SDDRV_ADDR;

	SND_INI_PRG_SZ(snd_init)  = (Uint16)  SDDRV_SIZE;

#else

	

	SND_INI_PRG_ADR(snd_init) = (Uint16 *)snddrv;

	SND_INI_PRG_SZ(snd_init)  = (Uint16)  sizeof(snddrv);

#endif


	SND_INI_ARA_ADR(snd_init) 	= (Uint16 *)sound_map;

	SND_INI_ARA_SZ(snd_init) 	= (Uint16)sizeof(sound_map);


	SND_Init(&snd_init);

	SND_ChgMap(0);

}


static PcmHn createHandle(PcmCreatePara *para)

{

	PcmHn pcm;


	pcm = PCM_CreateMemHandle(para);

	if (pcm == NULL) {

		return NULL;

	}

	PCM_NotifyWriteSize(pcm, 7680*2);


	return pcm;

}


void main()

{

	delta=0;

	frame=0;

	sndInit();

	PCM_MeInit();

	PcmCreatePara	para;

	PcmInfo 		info;

	PcmStatus	*st;

	static PcmWork g_movie_work;


	PCM_PARA_WORK(¶) = (struct PcmWork *)&g_movie_work;

	PCM_PARA_RING_ADDR(¶) = (Sint8 *)g_movie_buf;

	PCM_PARA_RING_SIZE(¶) = RING_BUF_SIZE;

	PCM_PARA_PCM_ADDR(¶) = PCM_ADDR;

	PCM_PARA_PCM_SIZE(¶) = PCM_SIZE;

 	st = &g_movie_work.status;


	memset((Sint8 *)g_movie_buf,0,7680L*4);


	st->need_ci = PCM_ON;

	PCM_INFO_FILE_TYPE(&info) = PCM_FILE_TYPE_NO_HEADER;			

	PCM_INFO_DATA_TYPE(&info)=PCM_DATA_TYPE_RLRLRL;//PCM_DATA_TYPE_LRLRLR;

	PCM_INFO_FILE_SIZE(&info) = 7680L*2;

	PCM_INFO_CHANNEL(&info) = 0x01;

	PCM_INFO_SAMPLING_BIT(&info) = 16;

	PCM_INFO_SAMPLING_RATE(&info)	= 7680L;

	PCM_INFO_SAMPLE_FILE(&info) = 7680L*2;

			

	pcm = createHandle(¶);


	PCM_SetPcmStreamNo(pcm, 0);


	PCM_SetInfo(pcm, &info);

	PCM_ChangePcmPara(pcm);


	PCM_MeSetLoop(pcm, 7680L);


	if (pcm == NULL) {

		return;

	}


	PCM_Start(pcm);


	while(1)

	{

		SN76496Update(&g_movie_buf[delta],128);

		delta+=256; 

		frame++;


		if(frame==60)

		{

			frame=0;

			delta=0;

		}


		PCM_Task(pcm);

	}



}

  RockinB Nov 18, 2006
That's cool, thanks a lot, vbt! Some portions of SBL code remind me of the AIF playback stuff.

 vbt Nov 18, 2006

RockinB said:
That's cool, thanks a lot, vbt! Some portions of SBL code remind me of the AIF playback stuff.


Sure but I found your code "hard" to read also I had no problem to read AIF/Tone/SEQ using samples. I didn't manage to read raw PCM with the SBL because of wrong settings and no sample for this.


About your idea to make a MOD/MP3,etc player, my code could help but ADPCM libs are more interesting. Instead of calling pcm_AudioMix it uses pcm_AudioAdpcmSct.


pcm_AudioAdpcmSct calls ADP_DecStereo/ADP_DecMono to play files. Unfortunatly the sources are not given with the SBL.


I have to check DUK sound play maybe there are specific sound functions.


So I'd say the good way would be to define PCM_ID and extend the PCM lib to play new format(easy to say ) with the same way as pcm_AudioAdpcmSct.


Here are PCM_IDs of the SBL :


PCM_ID_AIFF 'AIFF'

PCM_ID_AIFC 'AIFC'

PCM_ID_FORMAT_VERSION 'FVER'

PCM_ID_COMMON 'COMM'

PCM_ID_FORM 'FORM'

PCM_ID_SOUND_DATA 'SSND'

PCM_ID_ADPCM 'APCM'

PCM_ID_MARKER 'MARK'

PCM_ID_INS_TRUMENT 'INST'

PCM_ID_MIDI_DATA 'MIDI'

PCM_ID_AUDIO_RECORDING 'AESD'

PCM_ID_APPLICATION_SPECIFIC 'APPL'

PCM_ID_COMMENT 'COMT'

PCM_ID_NAME 'NAME'

PCM_ID_AUTHOR 'AUTH'

PCM_ID_COPYRIGHT '(c) '

PCM_ID_ANNOTATION 'ANNO'