[pulseaudio-discuss] [RFC PATCH 2/2] alsa: add support for Dolby TrueHD and DTS-HD HBR passthrough

[Arun Raghavan]

On Tue, 5 Sep 2017, at 09:17 AM, Pierre-Louis Bossart wrote:
> On 9/3/17 12:59 AM, Arun Raghavan wrote:
> > On Tue, 29 Aug 2017, at 04:19 AM, Pierre-Louis Bossart wrote:
> >> Add definitions and fixups for channel count
> >>
> >> Signed-off-by: Pierre-Louis Bossart
> >> <pierre-louis.bossart at linux.intel.com>
> >> ---
> >>   src/pulse/format.c          | 2 ++
> >>   src/pulse/format.h          | 8 ++++++++
> >>   src/pulsecore/core-format.c | 6 +++++-
> >>   3 files changed, 15 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/src/pulse/format.c b/src/pulse/format.c
> >> index 8474978..07b4420 100644
> >> --- a/src/pulse/format.c
> >> +++ b/src/pulse/format.c
> >> @@ -47,6 +47,8 @@ static const char* const _encoding_str_table[]= {
> >>       [PA_ENCODING_MPEG_IEC61937] = "mpeg-iec61937",
> >>       [PA_ENCODING_DTS_IEC61937] = "dts-iec61937",
> >>       [PA_ENCODING_MPEG2_AAC_IEC61937] = "mpeg2-aac-iec61937",
> >> +    [PA_ENCODING_TRUEHD_IEC61937] = "truehd-iec61937",
> >> +    [PA_ENCODING_DTSHD_IEC61937] = "dtshd-iec61937",
> >>       [PA_ENCODING_ANY] = "any",
> >>   };
> >>   
> >> diff --git a/src/pulse/format.h b/src/pulse/format.h
> >> index f606b3b..6122abe 100644
> >> --- a/src/pulse/format.h
> >> +++ b/src/pulse/format.h
> >> @@ -56,6 +56,12 @@ typedef enum pa_encoding {
> >>       PA_ENCODING_MPEG2_AAC_IEC61937,
> >>       /**< MPEG-2 AAC data encapsulated in IEC 61937 header/padding.
> >>       \since 4.0 */
> >>   
> >> +    PA_ENCODING_TRUEHD_IEC61937,
> >> +    /**< Dolby TrueHd data encapsulated in IEC 61937 header/padding.
> >> \since 11.0 */
> >> +
> >> +    PA_ENCODING_DTSHD_IEC61937,
> >> +    /**< DTS HD-MasterAudio encapsulated in IEC 61937 header/padding.
> >> \since 11.0 */
> >> +
> >>       PA_ENCODING_MAX,
> >>       /**< Valid encoding types must be less than this value */
> >>   
> >> @@ -71,6 +77,8 @@ typedef enum pa_encoding {
> >>   #define PA_ENCODING_MPEG_IEC61937 PA_ENCODING_MPEG_IEC61937
> >>   #define PA_ENCODING_DTS_IEC61937 PA_ENCODING_DTS_IEC61937
> >>   #define PA_ENCODING_MPEG2_AAC_IEC61937 PA_ENCODING_MPEG2_AAC_IEC61937
> >> +#define PA_ENCODING_DOLBY_TRUEHD_IEC61937
> >> PA_ENCODING_DOLBY_TRUEHD_IEC61937
> >> +#define PA_ENCODING_DTS_MA_IEC61937 PA_ENCODING_DTS_MA_IEC61937
> >>   #define PA_ENCODING_MAX PA_ENCODING_MAX
> >>   #define PA_ENCODING_INVALID PA_ENCODING_INVALID
> >>   /** \endcond */
> >> diff --git a/src/pulsecore/core-format.c b/src/pulsecore/core-format.c
> >> index 9d3c8d6..c3db267 100644
> >> --- a/src/pulsecore/core-format.c
> >> +++ b/src/pulsecore/core-format.c
> >> @@ -226,7 +226,11 @@ int pa_format_info_to_sample_spec_fake(const
> >> pa_format_info *f, pa_sample_spec *
> >>        * formats, this function should return a non-zero values for these.
> >>        */
> >>   
> >>       ss->format = PA_SAMPLE_S16LE;
> >> -    ss->channels = 2;
> >> +    if ((f->encoding == PA_ENCODING_TRUEHD_IEC61937) ||
> >> +       (f->encoding == PA_ENCODING_DTSHD_IEC61937))
> >> +       ss->channels = 8;
> >> +    else
> >> +       ss->channels = 2;
> >>   
> >>       if (map)
> >>           pa_channel_map_init_stereo(map);
> >> -- 
> > 
> > I don't have access to any hardware that does this (my laptop no longer
> > has an S/PDIF out :)), but for EAC3, instead of quadrupling the channel
> > count, I we quadruple the sample rate. I'm guessing this won't work for
> > HBR because those already might have high sample rates?
> 
> yep. ALSA needs 8ch at 192kHz + AES0=0x6 so enable HBR playback.

Okay, then we should be able to at least get changing the channel count
working on top of my last patch to replace update_rate() with
reconfigure(). Attaching a small WIP patch for that. If it works fine,
then we can figure out how to deal with the whole profile vs. channel
count thing.

Regards,
Arun
-------------- next part --------------
A non-text attachment was scrubbed...
Name: wip-hbr-passthrough.patch
Type: text/x-patch
Size: 1121 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20170905/9ede7a10/attachment.bin>