From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <374E372F.25549C60@jlc.net> Date: Fri, 28 May 1999 02:26:55 -0400 From: Dan Malek MIME-Version: 1.0 To: linuxppc-dev Subject: G3 sound recording Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: I just updated the PowerPC Mac dmasound driver so it will also record. It still needs some work, but the framework is there for anyone to update and it is useful. I did the development on my PowerBook G3, and will soon test it on my iMac. The driver supports the standard sample rates and the signed/unsigned 8- and 16-bit PCM data format. It does not support A-law or u-law because I have not yet taken the time to integrate the conversion algorithm. To the mixer read/write recording source I added the SOUND_MASK_MONITOR because the AWACS has the "loop through" capability. When this is set, along with your recording input selection, the audio input will be sent to your selected audio output (along with giving you the data). This is the way the audio CD players work, so if you turn this off don't be surprised when an audio CD program may not play. If this was not the right mask to use for this purpose, will someone with more knowledge please tell me what is correct. The driver runs full duplex, you can play and record at the same time. In fact, I tested it this way with a loop back program. Multiple threads and an extra slop buffer help out here. I left plenty of things for others to do :-). Also, be careful when requesting data formats. The driver will report more than are supported by the recording side, since it can also play A-law and u-law. I don't know the "right" thing to do here, since there is only one method to get formats (I know, fix the record side :-). Thanks to everyone that helped out, including the folks that started the work and to Paul for the documentation. Now, back to the 8xx and 82xx updates....... Have fun. -- Dan [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. Please check http://lists.linuxppc.org/ ]] [[ and http://www.linuxppc.org/ for useful information before posting. ]]