On Tue, 22 May 2018, at 4:32 PM, Alexander E. Patrakov wrote: > There is some Microsoft documentation that contradicts this code. > > https://msdn.microsoft.com/en-us/library/windows/desktop/dd316761(v=vs.85).aspx > > """ > Dolby TrueHD (MAT) > > Dolby TrueHD content is transmitted over IEC 60958 at 176.4 kHz / 8 > channels (requiring an IEC 60958 frame rate of 705.6 kHz) for content > sample rates of 44.1, 88.2 and 176.4 kHz, and 192 kHz / 8 channels > (requiring an IEC 60958 frame rate of 768 kHz) for content sample > rates of 48, 96 and 192 kHz. > """ Based on Peter's input in a private thread, seems this is not the case on Linux: https://github.com/xbmc/xbmc/blob/master/xbmc/cores/AudioEngine/Sinks/AESinkALSA.cpp#L135 https://github.com/xbmc/xbmc/blob/master/xbmc/cores/AudioEngine/Sinks/AESinkALSA.cpp#L486 Cheers, Arun > 2018-05-22 12:13 GMT+08:00 Arun Raghavan <arun at arunraghavan.net>: > > In high bitrate mode, we force 192kHz/8ch as the sample format, which is > > the expectation for HBR formats (as that is what allows for the largest > > possible packet size). > > --- > > src/pulsecore/core-format.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/src/pulsecore/core-format.c b/src/pulsecore/core-format.c > > index 862a74b5d..096acc3a2 100644 > > --- a/src/pulsecore/core-format.c > > +++ b/src/pulsecore/core-format.c > > @@ -248,6 +248,9 @@ int pa_format_info_to_sample_spec_fake(const pa_format_info *f, pa_sample_spec * > > > > if (f->encoding == PA_ENCODING_EAC3_IEC61937) > > ss->rate *= 4; > > + else if ((f->encoding == PA_ENCODING_TRUEHD_IEC61937) || > > + (f->encoding == PA_ENCODING_DTSHD_IEC61937)) > > + ss->rate = 192000; > > > > return 0; > > } > > -- > > 2.17.0 > > > > _______________________________________________ > > pulseaudio-discuss mailing list > > pulseaudio-discuss at lists.freedesktop.org > > https://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss > > > > -- > Alexander E. Patrakov
