Hello, I am writing an application that uses ALSA, and I don't want to write code to support all possible sample formats. On IRC, I asked whether it is OK to support only S24 format internally and rely on the "plug" to do the required conversion. I got a positive answer, but, when testing my application against my SAA7134-based tuner as a capture device, found that it doesn't work. The problem is also reproducible with "arecord". Given that plughw:1 refers to a SAA7134-based tuner (which obviously doesn't support S24_LE natively), running the following command arecord -vvv -f S24_LE -c 2 -r 32000 -D plughw:1 /dev/null produces the following output: ALSA lib pcm_mmap.c:369:(snd_pcm_mmap) mmap failed: Invalid argument arecord: set_params:961: Unable to install hw params: ACCESS: RW_INTERLEAVED FORMAT: S24_LE SUBFORMAT: STD SAMPLE_BITS: 32 FRAME_BITS: 64 CHANNELS: 2 RATE: 32000 PERIOD_TIME: 125000 PERIOD_SIZE: 4000 PERIOD_BYTES: 32000 PERIODS: 4 BUFFER_TIME: 500000 BUFFER_SIZE: 16000 BUFFER_BYTES: 128000 TICK_TIME: 4000 This is on Debian, the kernel is 2.6.22-2-amd64, libasound2 is 1.0.14a-2. Same for S32_LE. -- Alexander E. Patrakov _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
