> > > > > as suggested by > > ><a href="https://bugs.freedesktop.org/show_bug.cgi?id=84804">https://bugs.freedesktop.org/show_bug.cgi?id=84804</a> > > > > > > Signed-off-by: Peter Meerwald <<a href="mailto:pmeerw@pmeerw.net">pmeerw@pmeerw.net</a>> > > > --- > > > src/modules/alsa/alsa-util.c | 15 +++++++++++++++ > > > 1 file changed, 15 insertions(+) > > > > > > diff --git a/src/modules/alsa/alsa-util.c b/src/modules/alsa/alsa-util.c > > > index 4131cff..e382d4f 100644 > > > --- a/src/modules/alsa/alsa-util.c > > > +++ b/src/modules/alsa/alsa-util.c > > > @@ -183,6 +183,19 @@ static int set_buffer_size(snd_pcm_t *pcm_handle, > > snd_pcm_hw_params_t *hwparams, > > > return 0; > > > } > > > > > > +static void check_access(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t > > *hwparams, bool use_mmap) { > > > + if ((use_mmap && !snd_pcm_hw_params_test_access(pcm_handle, > > hwparams, SND_PCM_ACCESS_MMAP_INTERLEAVED)) || > > > + !snd_pcm_hw_params_test_access(pcm_handle, hwparams, > > SND_PCM_ACCESS_RW_INTERLEAVED)) > > > + pa_log_error("Weird, PCM claims to support interleaved access, > > but snd_pcm_hw_params_set_access() failed."); > > > > HW Params of device "hw:0,0": > > -------------------- > > ACCESS: MMAP_NONINTERLEAVED RW_NONINTERLEAVED > > FORMAT: S32_LE > > SUBFORMAT: STD > > SAMPLE_BITS: 32 > > FRAME_BITS: [448 832] > > CHANNELS: [14 26] > > RATE: [32000 96000] > > PERIOD_TIME: (666 256000] > > PERIOD_SIZE: [64 8192] > > PERIOD_BYTES: [3584 851968] > > PERIODS: 2 > > BUFFER_TIME: (1333 512000] > > BUFFER_SIZE: [128 16384] > > BUFFER_BYTES: [7168 1703936] > > TICK_TIME: ALL > > > > if use of test_access is to prevent set_access corrupt the configuration > > space of hw_param when access is not supported, > > I am not sure if I understand your comment correctly > > the idea of the patch is to improve the logging in case _INTERLEAVED is > not supported (but NONINTERLEAVED is) > > I don't want to change the current behaviour in the normal case, hence > check_access() is called after trying to set the access method Do pulseaudio assume all profiles of the sink use same access type ? Do pulseaudio allow sink and source use different access type? surround40, surround51 of those creative sound cards emu10k1, ca0106 use multi plugin of front, rear and clfe devices ><a href="http://pastebin.com/NnDvQ2kU">http://pastebin.com/NnDvQ2kU</a>> :~$ aplay --dump-hw-params -D surround40:CARD=Live /usr/share/sounds/alsa/Front_Left.wav appropriate number of channels is not available WAVE '/usr/share/sounds/alsa/Front_Left.wav' : Signed 16 bit Little Endian, frequency 48000 Hz, Mono HW Params of device "surround40:CARD=Live": -------------------- ACCESS: MMAP_COMPLEX RW_INTERLEAVED RW_NONINTERLEAVED FORMAT: U8 S16_LE SUBFORMAT: STD SAMPLE_BITS: [8 16] FRAME_BITS: [32 64] CHANNELS: 4 RATE: [4000 96000] PERIOD_TIME: (166 8192000] PERIOD_SIZE: [16 32768] PERIOD_BYTES: [64 262144] PERIODS: [1 1024] BUFFER_TIME: (666 8192000] BUFFER_SIZE: [64 32768] BUFFER_BYTES: [256 262144] TICK_TIME: ALL -------------------- This mean that front, rear, clfe (mono and stereo profile) support MMAP_INTERLEAVED and RW_INTERLEAVED But. surround40 and surround51 support MMAP_COMPLEX or RW_INTERLEAVED Seem no way to force pulseaudio to try RW_INTERLEAVED first since udev-detect only has tsched flag <a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/module-udev-detect.c">http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/module-udev-detect.c</a> What is the purpose of bool *use_mmap in pa_alsa_set_hw_params int pa_alsa_set_hw_params( snd_pcm_t *pcm_handle, pa_sample_spec *ss, snd_pcm_uframes_t *period_size, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t tsched_size, bool *use_mmap, bool *use_tsched, bool require_exact_channel_number) { <a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/module-alsa-card.c">http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/module-alsa-card.c</a> "mmap=<enable memory mapping?> " <a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/module-alsa-sink.c">http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/module-alsa-sink.c</a> "mmap=<enable memory mapping?> " <a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/module-alsa-source.c">http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/module-alsa-source.c</a> "mmap=<enable memory mapping?> "