Sorry to keep spamming about slPCMOn(). I'm struggling with the documentation in the "SGL Developer's Manual." I'm trying to port code that currently uses Alsa with the following parameters: SND_PCM_FORMAT_S16_LE, SND_PCM_ACCESS_RW_INTERLEAVED, 1 channel, and I can modify the rate to 8000 or 44100.
1) I don't understand what format slPCMOn() takes in. Passing in my PCM stream in doesn't sound correct at all and the length feels shorter. I have tried swapping the endianness of the PCM stream and it sounds worse. I'm guessing the SND_PCM_ACCESS_INTERLEAVED is the problem but if I'm only outputting on one channel that shouldn't be the issue correct?
2) Jo Engine doesn't seem to set the PCM frequency anywhere:
Code: | | | typedef struct { Uint8 mode ; /* Mode */ Uint8 channel ; /* PCM Channel Number */ Uint8 level ; /* 0 ~ 127 */ Sint8 pan ; /* -128 ~ +127 */ Uint16 pitch ; Uint8 eflevelR ; /* Effect level for Right(mono) 0 ~ 7 */ Uint8 efselectR ; /* Effect select for Right(mono) 0 ~ 15 */ Uint8 eflevelL ; /* Effect level for Left 0 ~ 7 */ Uint8 efselectL ; /* Effect select for Left 0 ~ 15 */ } PCM ; static PCM __jo_internal_pcm[JO_SOUND_MAX_CHANNEL] = { {(_Stereo | _PCM16Bit), 0, 127, 0, 0x0, 0, 0, 0, 0}, {(_Stereo | _PCM16Bit), 2, 127, 0, 0x0, 0, 0, 0, 0}, {(_Stereo | _PCM16Bit), 4, 127, 0, 0x0, 0, 0, 0, 0}, {(_Stereo | _PCM16Bit), 6, 127, 0, 0x0, 0, 0, 0, 0}, {(_Stereo | _PCM16Bit), 8, 127, 0, 0x0, 0, 0, 0, 0}, {(_Stereo | _PCM16Bit), 10, 127, 0, 0x0, 0, 0, 0, 0}, }; |
Clearly the pitch is set to 0 and I don't see it get changed anywhere. What frequency does that correspond to? I've looked at Ponut's lib and I think I understand how to set the pitch value now.
Thanks in advance. |
