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AAudio and MMAP | Android Open Source Project
https://source.android.com/devices/audio/aaudio
System property "aaudio.mmap_policy" should be set to 2 (AAUDIO_POLICY_AUTO) so the audio framework knows that MMAP mode is supported by the audio HAL. (see "Enabling AAudio MMAP Data Path" below.) audio_policy_configuration.xml file must also contain an output and input profile specific to MMAP/NO IRQ mode so that the …
mmap support for Raspberry Pi bcm2835 ALSA driver | Blog ...
https://blog.dowhile0.org/2013/04/27/mmap-support-for-raspberry-pi-bcm2835-alsa-driver/
mmap support for Raspberry Pi bcm2835 ALSA driver. Posted on April 27, 2013. by Javier Martinez Canillas. Because I work on an awesome company I spent last week improving the Raspberry Pi ALSA driver. A long standing issue was that the driver did not support memory-mapped I/O mode for audio stream transfers. ALSA supports two transfers methods for PCM …
linux - Is MMAP what I need from ALSA to play …
https://stackoverflow.com/questions/36906981/is-mmap-what-i-need-from-alsa-to-play-simultaneous-immediate-sounds-in-my-game
In any case, there's no way to modify audio data that you've already submitted to the alsa driver (snd_pcm_mmap_commit/writei/writen). The trick to have audio sound immediately is just to use very low buffer sizes, < 10ms will do. For this you'll want to use hw: devices, other device types usually add latency.
Alsa api: how to use mmap in c? - Stack Overflow
https://stackoverflow.com/questions/30279326/alsa-api-how-to-use-mmap-in-c
First you need to set the access type one of the MMAP types (typically, SND_PCM_ACCESS_MMAP_INTERLEAVED instead of SND_PCM_ACCESS_RW_INTERLEAVED). When you want to write to the buffer, call snd_pcm_mmap_begin() with the number of frames you want to write. If this function succeeds, it returns a pointer to the buffer (areas[0].addr, or …
Writing an ALSA Driver — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/sound/kernel-api/writing-an-alsa-driver.html
If the control is closely associated with some specific device on the sound card, use HWDEP, PCM, RAWMIDI, TIMER, or SEQUENCER, and specify the device number with the device and subdevice fields. The name is the name identifier string. Since ALSA 0.9.x, the control name is very important, because its role is classified from its name.
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