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component/bt: modify the SBC encoder to support mSBC mode

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This commit is contained in:
wangmengyang 2018-05-25 14:23:38 +08:00 committed by baohongde
parent f15323b453
commit 7c28611a3d
4 changed files with 117 additions and 77 deletions
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3
components/bt/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c
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@ -820,7 +820,7 @@ static void btc_a2dp_source_enc_init(BT_HDR *p_msg)
btc_aa_src_cb.timestamp = 0;
/* SBC encoder config (enforced even if not used) */
btc_sbc_encoder.sbc_mode = SBC_MODE_STD;
btc_sbc_encoder.s16ChannelMode = pInitAudio->ChannelMode;
btc_sbc_encoder.s16NumOfSubBands = pInitAudio->NumOfSubBands;
btc_sbc_encoder.s16NumOfBlocks = pInitAudio->NumOfBlocks;
@ -879,7 +879,6 @@ static void btc_a2dp_source_enc_update(BT_HDR *p_msg)
BTC_MEDIA_AA_SBC_OFFSET - sizeof(BT_HDR))
< pUpdateAudio->MinMtuSize) ? (BTC_MEDIA_AA_BUF_SIZE - BTC_MEDIA_AA_SBC_OFFSET
- sizeof(BT_HDR)) : pUpdateAudio->MinMtuSize;
/* Set the initial target bit rate */
pstrEncParams->u16BitRate = btc_a2dp_source_get_sbc_rate();

7
components/bt/bluedroid/external/sbc/encoder/include/sbc_encoder.h vendored
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@ -67,6 +67,12 @@
#define SBC_NULL 0
#define SBC_MODE_STD 0
#define SBC_MODE_MSBC 1
#define SBC_SYNC_WORD_STD (0x9C)
#define SBC_SYNC_WORD_MSBC (0xAD)
#ifndef SBC_MAX_NUM_FRAME
#define SBC_MAX_NUM_FRAME 1
#endif
@ -161,6 +167,7 @@ typedef struct SBC_ENC_PARAMS_TAG {
SINT16 s16BitPool; /* 16*numOfSb for mono & dual;
32*numOfSb for stereo & joint stereo */
UINT16 u16BitRate;
UINT8 sbc_mode; /* SBC_MODE_STD or SBC_MODE_MSBC */
UINT8 u8NumPacketToEncode; /* number of sbc frame to encode. Default is 1 */
#if (SBC_JOINT_STE_INCLUDED == TRUE)
SINT16 as16Join[SBC_MAX_NUM_OF_SUBBANDS]; /*1 if JS, 0 otherwise*/

29
components/bt/bluedroid/external/sbc/encoder/srce/sbc_encoder.c vendored
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@ -184,7 +184,6 @@ void SBC_Encoder(SBC_ENC_PARAMS *pstrEncParams)
/* Quantize the encoded audio */
EncPacking(pstrEncParams);
} while (--(pstrEncParams->u8NumPacketToEncode));
pstrEncParams->u8NumPacketToEncode = 1; /* default is one for retrocompatibility purpose */
@ -206,6 +205,7 @@ void SBC_Encoder_Init(SBC_ENC_PARAMS *pstrEncParams)
pstrEncParams->u8NumPacketToEncode = 1; /* default is one for retrocompatibility purpose */
if (pstrEncParams->sbc_mode != SBC_MODE_MSBC) {
/* Required number of channels */
if (pstrEncParams->s16ChannelMode == SBC_MONO) {
pstrEncParams->s16NumOfChannels = 1;
@ -281,7 +281,34 @@ void SBC_Encoder_Init(SBC_ENC_PARAMS *pstrEncParams)
/* Loudness or SNR */
HeaderParams |= ((pstrEncParams->s16AllocationMethod & 1) << 1);
HeaderParams |= ((pstrEncParams->s16NumOfSubBands >> 3) & 1); /*4 or 8*/
pstrEncParams->FrameHeader = HeaderParams;
} else {
// mSBC
// Use mSBC encoding parameters to reset the control field
/* Required number of channels: 1 */
pstrEncParams->s16ChannelMode = SBC_MONO;
pstrEncParams->s16NumOfChannels = 1;
/* Required Sampling frequency : 16KHz */
pstrEncParams->s16SamplingFreq = SBC_sf16000;
/* Bit pool value: 26 */
pstrEncParams->s16BitPool = 26;
/* number of subbands: 8 */
pstrEncParams->s16NumOfSubBands = 8;
/* number of blocks: 15 */
pstrEncParams->s16NumOfBlocks = 15;
/* allocation method: loudness */
pstrEncParams->s16AllocationMethod = SBC_LOUDNESS;
/* set the header paramers, unused for mSBC */
pstrEncParams->FrameHeader = 0;
}
if (pstrEncParams->s16NumOfSubBands == 4) {
if (pstrEncParams->s16NumOfChannels == 1) {

9
components/bt/bluedroid/external/sbc/encoder/srce/sbc_packing.c vendored
View File

@ -84,10 +84,17 @@ void EncPacking(SBC_ENC_PARAMS *pstrEncParams)
#endif
pu8PacketPtr = pstrEncParams->pu8NextPacket; /*Initialize the ptr*/
*pu8PacketPtr++ = (UINT8)0x9C; /*Sync word*/
if (pstrEncParams->sbc_mode != SBC_MODE_MSBC) {
*pu8PacketPtr++ = (UINT8)SBC_SYNC_WORD_STD; /*Sync word*/
*pu8PacketPtr++ = (UINT8)(pstrEncParams->FrameHeader);
*pu8PacketPtr = (UINT8)(pstrEncParams->s16BitPool & 0x00FF);
} else {
*pu8PacketPtr++ = (UINT8)SBC_SYNC_WORD_MSBC; /*Sync word*/
// two reserved bytes
*pu8PacketPtr++ = 0;
*pu8PacketPtr = 0;
}
pu8PacketPtr += 2; /*skip for CRC*/
/*here it indicate if it is byte boundary or nibble boundary*/