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

Mon, 04 Sep 2017 20:47:43 -0700 

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
<[email protected]>
---
  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.
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