Re: [alsa-devel] [PATCH 05/44] firewire-lib: Add support for MIDI capture/playback

Takashi Sakamoto wrote:

For capturing/playbacking MIDI messages, this commit adds one MIDI conformant data channel.

+++ b/sound/firewire/amdtp.c +static void amdtp_pull_midi(struct amdtp_stream *s,

• 	    __be32 *buffer, unsigned int frames)
  

+{

• unsigned int f, port;

• int len;

• u8 *b;

• for (f = 0; f < frames; f++) {

• port = (s->data_block_counter + f) % 8;
  

• b = (u8 *)&buffer[s->pcm_channels + 1];
  
  

• len = b[0] - 0x80;
  

• if ((len > 1) &&  (3 < len) && (s->midi[port]))
  

This condition is true only for len==2.

• 	snd_rawmidi_receive(s->midi[port], b + 1, len);
  

• buffer += s->data_block_quadlets;
  

• }

}

Regards, Clemens