According to A2DP specification; section SBC; Codec Specific Information
Elements; Minimum / Maximum Bitpool Value, range for Bitpool value is from
2 to 250.
A2DP specification also defines bitpool values for two SBC modes: Middle
Quality and High Quality. They depends on channel mode and frequency. So
add definitions for them into a2dp-codecs file too.
File android/hal-audio-sbc.c was updated to use High Quality mode for
chosen frequency.
---
android/hal-audio-sbc.c | 6 +++---
profiles/audio/a2dp-codecs.h | 12 +++++++++++-
2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/android/hal-audio-sbc.c b/android/hal-audio-sbc.c
index 80e271ed6..b06cafb7b 100644
--- a/android/hal-audio-sbc.c
+++ b/android/hal-audio-sbc.c
@@ -92,7 +92,7 @@ static const a2dp_sbc_t sbc_presets[] = {
.block_length = SBC_BLOCK_LENGTH_4 | SBC_BLOCK_LENGTH_8 |
SBC_BLOCK_LENGTH_12 | SBC_BLOCK_LENGTH_16,
.min_bitpool = SBC_MIN_BITPOOL,
- .max_bitpool = SBC_MAX_BITPOOL
+ .max_bitpool = SBC_BITPOOL_HQ_JOINT_STEREO_44100,
},
{
.frequency = SBC_SAMPLING_FREQ_44100,
@@ -101,7 +101,7 @@ static const a2dp_sbc_t sbc_presets[] = {
.allocation_method = SBC_ALLOCATION_LOUDNESS,
.block_length = SBC_BLOCK_LENGTH_16,
.min_bitpool = SBC_MIN_BITPOOL,
- .max_bitpool = SBC_MAX_BITPOOL
+ .max_bitpool = SBC_BITPOOL_HQ_JOINT_STEREO_44100,
},
{
.frequency = SBC_SAMPLING_FREQ_48000,
@@ -110,7 +110,7 @@ static const a2dp_sbc_t sbc_presets[] = {
.allocation_method = SBC_ALLOCATION_LOUDNESS,
.block_length = SBC_BLOCK_LENGTH_16,
.min_bitpool = SBC_MIN_BITPOOL,
- .max_bitpool = SBC_MAX_BITPOOL
+ .max_bitpool = SBC_BITPOOL_HQ_JOINT_STEREO_48000,
},
};
diff --git a/profiles/audio/a2dp-codecs.h b/profiles/audio/a2dp-codecs.h
index 16088dc26..0d2cc155b 100644
--- a/profiles/audio/a2dp-codecs.h
+++ b/profiles/audio/a2dp-codecs.h
@@ -53,8 +53,18 @@
#define SBC_ALLOCATION_SNR (1 << 1)
#define SBC_ALLOCATION_LOUDNESS 1
-#define SBC_MAX_BITPOOL 64
#define SBC_MIN_BITPOOL 2
+#define SBC_MAX_BITPOOL 250
+
+/* Other settings: Block length = 16, Allocation method = Loudness, Subbands = 8 */
+#define SBC_BITPOOL_MQ_MONO_44100 19
+#define SBC_BITPOOL_MQ_MONO_48000 18
+#define SBC_BITPOOL_MQ_JOINT_STEREO_44100 35
+#define SBC_BITPOOL_MQ_JOINT_STEREO_48000 33
+#define SBC_BITPOOL_HQ_MONO_44100 31
+#define SBC_BITPOOL_HQ_MONO_48000 29
+#define SBC_BITPOOL_HQ_JOINT_STEREO_44100 53
+#define SBC_BITPOOL_HQ_JOINT_STEREO_48000 51
#define MPEG_CHANNEL_MODE_MONO (1 << 3)
#define MPEG_CHANNEL_MODE_DUAL_CHANNEL (1 << 2)
--
2.11.0
