/****************************************************************************** * * Copyright (C) 2002-2012 Broadcom Corporation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * ******************************************************************************/ /****************************************************************************** * * Utility functions to help build and parse SBC Codec Information Element * and Media Payload. * ******************************************************************************/ #define LOG_TAG "a2dp_sbc" #include "bt_target.h" #include "a2dp_sbc.h" #include #include #include "a2dp_sbc_encoder.h" #include "bt_utils.h" #include "embdrv/sbc/encoder/include/sbc_encoder.h" #include "osi/include/log.h" #include "osi/include/osi.h" #define A2DP_SBC_MAX_BITPOOL 53 /* data type for the SBC Codec Information Element */ typedef struct { uint8_t samp_freq; /* Sampling frequency */ uint8_t ch_mode; /* Channel mode */ uint8_t block_len; /* Block length */ uint8_t num_subbands; /* Number of subbands */ uint8_t alloc_method; /* Allocation method */ uint8_t min_bitpool; /* Minimum bitpool */ uint8_t max_bitpool; /* Maximum bitpool */ btav_a2dp_codec_bits_per_sample_t bits_per_sample; } tA2DP_SBC_CIE; /* SBC SRC codec capabilities */ static const tA2DP_SBC_CIE a2dp_sbc_caps = { A2DP_SBC_IE_SAMP_FREQ_44, /* samp_freq */ A2DP_SBC_IE_CH_MD_JOINT, /* ch_mode */ A2DP_SBC_IE_BLOCKS_16, /* block_len */ A2DP_SBC_IE_SUBBAND_8, /* num_subbands */ A2DP_SBC_IE_ALLOC_MD_L, /* alloc_method */ A2DP_SBC_IE_MIN_BITPOOL, /* min_bitpool */ A2DP_SBC_MAX_BITPOOL, /* max_bitpool */ BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16 /* bits_per_sample */ }; /* SBC SINK codec capabilities */ static const tA2DP_SBC_CIE a2dp_sbc_sink_caps = { (A2DP_SBC_IE_SAMP_FREQ_48 | A2DP_SBC_IE_SAMP_FREQ_44), /* samp_freq */ (A2DP_SBC_IE_CH_MD_MONO | A2DP_SBC_IE_CH_MD_STEREO | A2DP_SBC_IE_CH_MD_JOINT | A2DP_SBC_IE_CH_MD_DUAL), /* ch_mode */ (A2DP_SBC_IE_BLOCKS_16 | A2DP_SBC_IE_BLOCKS_12 | A2DP_SBC_IE_BLOCKS_8 | A2DP_SBC_IE_BLOCKS_4), /* block_len */ (A2DP_SBC_IE_SUBBAND_4 | A2DP_SBC_IE_SUBBAND_8), /* num_subbands */ (A2DP_SBC_IE_ALLOC_MD_L | A2DP_SBC_IE_ALLOC_MD_S), /* alloc_method */ A2DP_SBC_IE_MIN_BITPOOL, /* min_bitpool */ A2DP_SBC_MAX_BITPOOL, /* max_bitpool */ BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16 /* bits_per_sample */ }; /* Default SBC codec configuration */ const tA2DP_SBC_CIE a2dp_sbc_default_config = { A2DP_SBC_IE_SAMP_FREQ_44, /* samp_freq */ A2DP_SBC_IE_CH_MD_JOINT, /* ch_mode */ A2DP_SBC_IE_BLOCKS_16, /* block_len */ A2DP_SBC_IE_SUBBAND_8, /* num_subbands */ A2DP_SBC_IE_ALLOC_MD_L, /* alloc_method */ A2DP_SBC_IE_MIN_BITPOOL, /* min_bitpool */ A2DP_SBC_MAX_BITPOOL, /* max_bitpool */ BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16 /* bits_per_sample */ }; static const tA2DP_ENCODER_INTERFACE a2dp_encoder_interface_sbc = { a2dp_sbc_encoder_init, a2dp_sbc_encoder_cleanup, a2dp_sbc_feeding_reset, a2dp_sbc_feeding_flush, a2dp_sbc_get_encoder_interval_ms, a2dp_sbc_send_frames, nullptr // set_transmit_queue_length }; static tA2DP_STATUS A2DP_CodecInfoMatchesCapabilitySbc( const tA2DP_SBC_CIE* p_cap, const uint8_t* p_codec_info, bool is_capability); static void A2DP_ParseMplHeaderSbc(uint8_t* p_src, bool* p_frag, bool* p_start, bool* p_last, uint8_t* p_num); // Builds the SBC Media Codec Capabilities byte sequence beginning from the // LOSC octet. |media_type| is the media type |AVDT_MEDIA_TYPE_*|. // |p_ie| is a pointer to the SBC Codec Information Element information. // The result is stored in |p_result|. Returns A2DP_SUCCESS on success, // otherwise the corresponding A2DP error status code. static tA2DP_STATUS A2DP_BuildInfoSbc(uint8_t media_type, const tA2DP_SBC_CIE* p_ie, uint8_t* p_result) { if (p_ie == NULL || p_result == NULL || (p_ie->samp_freq & ~A2DP_SBC_IE_SAMP_FREQ_MSK) || (p_ie->ch_mode & ~A2DP_SBC_IE_CH_MD_MSK) || (p_ie->block_len & ~A2DP_SBC_IE_BLOCKS_MSK) || (p_ie->num_subbands & ~A2DP_SBC_IE_SUBBAND_MSK) || (p_ie->alloc_method & ~A2DP_SBC_IE_ALLOC_MD_MSK) || (p_ie->min_bitpool > p_ie->max_bitpool) || (p_ie->min_bitpool < A2DP_SBC_IE_MIN_BITPOOL) || (p_ie->min_bitpool > A2DP_SBC_IE_MAX_BITPOOL) || (p_ie->max_bitpool < A2DP_SBC_IE_MIN_BITPOOL) || (p_ie->max_bitpool > A2DP_SBC_IE_MAX_BITPOOL)) { /* if any unused bit is set */ return A2DP_INVALID_PARAMS; } *p_result++ = A2DP_SBC_INFO_LEN; *p_result++ = (media_type << 4); *p_result++ = A2DP_MEDIA_CT_SBC; /* Media Codec Specific Information Element */ *p_result++ = p_ie->samp_freq | p_ie->ch_mode; *p_result++ = p_ie->block_len | p_ie->num_subbands | p_ie->alloc_method; *p_result++ = p_ie->min_bitpool; *p_result = p_ie->max_bitpool; return A2DP_SUCCESS; } // Parses the SBC Media Codec Capabilities byte sequence beginning from the // LOSC octet. The result is stored in |p_ie|. The byte sequence to parse is // |p_codec_info|. If |is_capability| is true, the byte sequence contains // codec capability. // Returns A2DP_SUCCESS on success, otherwise the corresponding A2DP error // status code. static tA2DP_STATUS A2DP_ParseInfoSbc(tA2DP_SBC_CIE* p_ie, const uint8_t* p_codec_info, bool is_capability) { uint8_t losc; uint8_t media_type; tA2DP_CODEC_TYPE codec_type; if (p_ie == NULL || p_codec_info == NULL) return A2DP_INVALID_PARAMS; // Check the codec capability length losc = *p_codec_info++; if (losc != A2DP_SBC_INFO_LEN) return A2DP_WRONG_CODEC; media_type = (*p_codec_info++) >> 4; codec_type = *p_codec_info++; /* Check the Media Type and Media Codec Type */ if (media_type != AVDT_MEDIA_TYPE_AUDIO || codec_type != A2DP_MEDIA_CT_SBC) { return A2DP_WRONG_CODEC; } p_ie->samp_freq = *p_codec_info & A2DP_SBC_IE_SAMP_FREQ_MSK; p_ie->ch_mode = *p_codec_info & A2DP_SBC_IE_CH_MD_MSK; p_codec_info++; p_ie->block_len = *p_codec_info & A2DP_SBC_IE_BLOCKS_MSK; p_ie->num_subbands = *p_codec_info & A2DP_SBC_IE_SUBBAND_MSK; p_ie->alloc_method = *p_codec_info & A2DP_SBC_IE_ALLOC_MD_MSK; p_codec_info++; p_ie->min_bitpool = *p_codec_info++; p_ie->max_bitpool = *p_codec_info++; if (p_ie->min_bitpool < A2DP_SBC_IE_MIN_BITPOOL || p_ie->min_bitpool > A2DP_SBC_IE_MAX_BITPOOL) { return A2DP_BAD_MIN_BITPOOL; } if (p_ie->max_bitpool < A2DP_SBC_IE_MIN_BITPOOL || p_ie->max_bitpool > A2DP_SBC_IE_MAX_BITPOOL || p_ie->max_bitpool < p_ie->min_bitpool) { return A2DP_BAD_MAX_BITPOOL; } if (is_capability) return A2DP_SUCCESS; if (A2DP_BitsSet(p_ie->samp_freq) != A2DP_SET_ONE_BIT) return A2DP_BAD_SAMP_FREQ; if (A2DP_BitsSet(p_ie->ch_mode) != A2DP_SET_ONE_BIT) return A2DP_BAD_CH_MODE; if (A2DP_BitsSet(p_ie->block_len) != A2DP_SET_ONE_BIT) return A2DP_BAD_BLOCK_LEN; if (A2DP_BitsSet(p_ie->num_subbands) != A2DP_SET_ONE_BIT) return A2DP_BAD_SUBBANDS; if (A2DP_BitsSet(p_ie->alloc_method) != A2DP_SET_ONE_BIT) return A2DP_BAD_ALLOC_METHOD; return A2DP_SUCCESS; } // Build the SBC Media Payload Header. // |p_dst| points to the location where the header should be written to. // If |frag| is true, the media payload frame is fragmented. // |start| is true for the first packet of a fragmented frame. // |last| is true for the last packet of a fragmented frame. // If |frag| is false, |num| is the number of number of frames in the packet, // otherwise is the number of remaining fragments (including this one). static void A2DP_BuildMediaPayloadHeaderSbc(uint8_t* p_dst, bool frag, bool start, bool last, uint8_t num) { if (p_dst == NULL) return; *p_dst = 0; if (frag) *p_dst |= A2DP_SBC_HDR_F_MSK; if (start) *p_dst |= A2DP_SBC_HDR_S_MSK; if (last) *p_dst |= A2DP_SBC_HDR_L_MSK; *p_dst |= (A2DP_SBC_HDR_NUM_MSK & num); } /****************************************************************************** * * Function A2DP_ParseMplHeaderSbc * * Description This function is called by an application to parse * the SBC Media Payload header. * Input Parameters: * p_src: the byte sequence to parse.. * * Output Parameters: * frag: 1, if fragmented. 0, otherwise. * * start: 1, if the starting packet of a fragmented frame. * * last: 1, if the last packet of a fragmented frame. * * num: If frag is 1, this is the number of remaining * fragments * (including this fragment) of this frame. * If frag is 0, this is the number of frames in * this packet. * * Returns void. *****************************************************************************/ UNUSED_ATTR static void A2DP_ParseMplHeaderSbc(uint8_t* p_src, bool* p_frag, bool* p_start, bool* p_last, uint8_t* p_num) { if (p_src && p_frag && p_start && p_last && p_num) { *p_frag = (*p_src & A2DP_SBC_HDR_F_MSK) ? true : false; *p_start = (*p_src & A2DP_SBC_HDR_S_MSK) ? true : false; *p_last = (*p_src & A2DP_SBC_HDR_L_MSK) ? true : false; *p_num = (*p_src & A2DP_SBC_HDR_NUM_MSK); } } const char* A2DP_CodecNameSbc(UNUSED_ATTR const uint8_t* p_codec_info) { return "SBC"; } bool A2DP_IsSourceCodecValidSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE cfg_cie; /* Use a liberal check when parsing the codec info */ return (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) || (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS); } bool A2DP_IsSinkCodecValidSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE cfg_cie; /* Use a liberal check when parsing the codec info */ return (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) || (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS); } bool A2DP_IsPeerSourceCodecValidSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE cfg_cie; /* Use a liberal check when parsing the codec info */ return (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) || (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS); } bool A2DP_IsPeerSinkCodecValidSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE cfg_cie; /* Use a liberal check when parsing the codec info */ return (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, false) == A2DP_SUCCESS) || (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, true) == A2DP_SUCCESS); } bool A2DP_IsSinkCodecSupportedSbc(const uint8_t* p_codec_info) { return (A2DP_CodecInfoMatchesCapabilitySbc(&a2dp_sbc_sink_caps, p_codec_info, false) == A2DP_SUCCESS); } bool A2DP_IsPeerSourceCodecSupportedSbc(const uint8_t* p_codec_info) { return (A2DP_CodecInfoMatchesCapabilitySbc(&a2dp_sbc_sink_caps, p_codec_info, true) == A2DP_SUCCESS); } void A2DP_InitDefaultCodecSbc(uint8_t* p_codec_info) { if (A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &a2dp_sbc_default_config, p_codec_info) != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: A2DP_BuildInfoSbc failed", __func__); } } // Checks whether A2DP SBC codec configuration matches with a device's codec // capabilities. |p_cap| is the SBC codec configuration. |p_codec_info| is // the device's codec capabilities. |is_capability| is true if // |p_codec_info| contains A2DP codec capability. // Returns A2DP_SUCCESS if the codec configuration matches with capabilities, // otherwise the corresponding A2DP error status code. static tA2DP_STATUS A2DP_CodecInfoMatchesCapabilitySbc( const tA2DP_SBC_CIE* p_cap, const uint8_t* p_codec_info, bool is_capability) { tA2DP_STATUS status; tA2DP_SBC_CIE cfg_cie; /* parse configuration */ status = A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, is_capability); if (status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: parsing failed %d", __func__, status); return status; } /* verify that each parameter is in range */ LOG_DEBUG(LOG_TAG, "%s: FREQ peer: 0x%x, capability 0x%x", __func__, cfg_cie.samp_freq, p_cap->samp_freq); LOG_DEBUG(LOG_TAG, "%s: CH_MODE peer: 0x%x, capability 0x%x", __func__, cfg_cie.ch_mode, p_cap->ch_mode); LOG_DEBUG(LOG_TAG, "%s: BLOCK_LEN peer: 0x%x, capability 0x%x", __func__, cfg_cie.block_len, p_cap->block_len); LOG_DEBUG(LOG_TAG, "%s: SUB_BAND peer: 0x%x, capability 0x%x", __func__, cfg_cie.num_subbands, p_cap->num_subbands); LOG_DEBUG(LOG_TAG, "%s: ALLOC_METHOD peer: 0x%x, capability 0x%x", __func__, cfg_cie.alloc_method, p_cap->alloc_method); LOG_DEBUG(LOG_TAG, "%s: MIN_BitPool peer: 0x%x, capability 0x%x", __func__, cfg_cie.min_bitpool, p_cap->min_bitpool); LOG_DEBUG(LOG_TAG, "%s: MAX_BitPool peer: 0x%x, capability 0x%x", __func__, cfg_cie.max_bitpool, p_cap->max_bitpool); /* sampling frequency */ if ((cfg_cie.samp_freq & p_cap->samp_freq) == 0) return A2DP_NS_SAMP_FREQ; /* channel mode */ if ((cfg_cie.ch_mode & p_cap->ch_mode) == 0) return A2DP_NS_CH_MODE; /* block length */ if ((cfg_cie.block_len & p_cap->block_len) == 0) return A2DP_BAD_BLOCK_LEN; /* subbands */ if ((cfg_cie.num_subbands & p_cap->num_subbands) == 0) return A2DP_NS_SUBBANDS; /* allocation method */ if ((cfg_cie.alloc_method & p_cap->alloc_method) == 0) return A2DP_NS_ALLOC_METHOD; /* min bitpool */ if (cfg_cie.min_bitpool > p_cap->max_bitpool) return A2DP_NS_MIN_BITPOOL; /* max bitpool */ if (cfg_cie.max_bitpool < p_cap->min_bitpool) return A2DP_NS_MAX_BITPOOL; return A2DP_SUCCESS; } tA2DP_STATUS A2DP_BuildSrc2SinkConfigSbc(const uint8_t* p_src_cap, uint8_t* p_pref_cfg) { tA2DP_SBC_CIE src_cap; tA2DP_SBC_CIE pref_cap; /* initialize it to default SBC configuration */ A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &a2dp_sbc_default_config, p_pref_cfg); /* now try to build a preferred one */ /* parse configuration */ tA2DP_STATUS status = A2DP_ParseInfoSbc(&src_cap, p_src_cap, true); if (status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: can't parse src cap ret = %d", __func__, status); return A2DP_FAIL; } if (src_cap.samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) pref_cap.samp_freq = A2DP_SBC_IE_SAMP_FREQ_48; else if (src_cap.samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) pref_cap.samp_freq = A2DP_SBC_IE_SAMP_FREQ_44; if (src_cap.ch_mode & A2DP_SBC_IE_CH_MD_JOINT) pref_cap.ch_mode = A2DP_SBC_IE_CH_MD_JOINT; else if (src_cap.ch_mode & A2DP_SBC_IE_CH_MD_STEREO) pref_cap.ch_mode = A2DP_SBC_IE_CH_MD_STEREO; else if (src_cap.ch_mode & A2DP_SBC_IE_CH_MD_DUAL) pref_cap.ch_mode = A2DP_SBC_IE_CH_MD_DUAL; else if (src_cap.ch_mode & A2DP_SBC_IE_CH_MD_MONO) pref_cap.ch_mode = A2DP_SBC_IE_CH_MD_MONO; if (src_cap.block_len & A2DP_SBC_IE_BLOCKS_16) pref_cap.block_len = A2DP_SBC_IE_BLOCKS_16; else if (src_cap.block_len & A2DP_SBC_IE_BLOCKS_12) pref_cap.block_len = A2DP_SBC_IE_BLOCKS_12; else if (src_cap.block_len & A2DP_SBC_IE_BLOCKS_8) pref_cap.block_len = A2DP_SBC_IE_BLOCKS_8; else if (src_cap.block_len & A2DP_SBC_IE_BLOCKS_4) pref_cap.block_len = A2DP_SBC_IE_BLOCKS_4; if (src_cap.num_subbands & A2DP_SBC_IE_SUBBAND_8) pref_cap.num_subbands = A2DP_SBC_IE_SUBBAND_8; else if (src_cap.num_subbands & A2DP_SBC_IE_SUBBAND_4) pref_cap.num_subbands = A2DP_SBC_IE_SUBBAND_4; if (src_cap.alloc_method & A2DP_SBC_IE_ALLOC_MD_L) pref_cap.alloc_method = A2DP_SBC_IE_ALLOC_MD_L; else if (src_cap.alloc_method & A2DP_SBC_IE_ALLOC_MD_S) pref_cap.alloc_method = A2DP_SBC_IE_ALLOC_MD_S; pref_cap.min_bitpool = src_cap.min_bitpool; pref_cap.max_bitpool = src_cap.max_bitpool; A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &pref_cap, p_pref_cfg); return A2DP_SUCCESS; } bool A2DP_CodecTypeEqualsSbc(const uint8_t* p_codec_info_a, const uint8_t* p_codec_info_b) { tA2DP_SBC_CIE sbc_cie_a; tA2DP_SBC_CIE sbc_cie_b; // Check whether the codec info contains valid data tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie_a, p_codec_info_a, true); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return false; } a2dp_status = A2DP_ParseInfoSbc(&sbc_cie_b, p_codec_info_b, true); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return false; } tA2DP_CODEC_TYPE codec_type_a = A2DP_GetCodecType(p_codec_info_a); tA2DP_CODEC_TYPE codec_type_b = A2DP_GetCodecType(p_codec_info_b); return (codec_type_a == codec_type_b) && (codec_type_a == A2DP_MEDIA_CT_SBC); } bool A2DP_CodecEqualsSbc(const uint8_t* p_codec_info_a, const uint8_t* p_codec_info_b) { tA2DP_SBC_CIE sbc_cie_a; tA2DP_SBC_CIE sbc_cie_b; // Check whether the codec info contains valid data tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie_a, p_codec_info_a, true); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return false; } a2dp_status = A2DP_ParseInfoSbc(&sbc_cie_b, p_codec_info_b, true); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return false; } tA2DP_CODEC_TYPE codec_type_a = A2DP_GetCodecType(p_codec_info_a); tA2DP_CODEC_TYPE codec_type_b = A2DP_GetCodecType(p_codec_info_b); if ((codec_type_a != codec_type_b) || (codec_type_a != A2DP_MEDIA_CT_SBC)) return false; return (sbc_cie_a.samp_freq == sbc_cie_b.samp_freq) && (sbc_cie_a.ch_mode == sbc_cie_b.ch_mode) && (sbc_cie_a.block_len == sbc_cie_b.block_len) && (sbc_cie_a.num_subbands == sbc_cie_b.num_subbands) && (sbc_cie_a.alloc_method == sbc_cie_b.alloc_method) && (sbc_cie_a.min_bitpool == sbc_cie_b.min_bitpool) && (sbc_cie_a.max_bitpool == sbc_cie_b.max_bitpool); } int A2DP_GetTrackSampleRateSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.samp_freq) { case A2DP_SBC_IE_SAMP_FREQ_16: return 16000; case A2DP_SBC_IE_SAMP_FREQ_32: return 32000; case A2DP_SBC_IE_SAMP_FREQ_44: return 44100; case A2DP_SBC_IE_SAMP_FREQ_48: return 48000; default: break; } return -1; } int A2DP_GetTrackBitsPerSampleSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } return 16; // For SBC we always use 16 bits per audio sample } int A2DP_GetTrackChannelCountSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.ch_mode) { case A2DP_SBC_IE_CH_MD_MONO: return 1; case A2DP_SBC_IE_CH_MD_DUAL: case A2DP_SBC_IE_CH_MD_STEREO: case A2DP_SBC_IE_CH_MD_JOINT: return 2; default: break; } return -1; } int A2DP_GetNumberOfSubbandsSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.num_subbands) { case A2DP_SBC_IE_SUBBAND_4: return 4; case A2DP_SBC_IE_SUBBAND_8: return 8; default: break; } return -1; } int A2DP_GetNumberOfBlocksSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.block_len) { case A2DP_SBC_IE_BLOCKS_4: return 4; case A2DP_SBC_IE_BLOCKS_8: return 8; case A2DP_SBC_IE_BLOCKS_12: return 12; case A2DP_SBC_IE_BLOCKS_16: return 16; default: break; } return -1; } int A2DP_GetAllocationMethodCodeSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.alloc_method) { case A2DP_SBC_IE_ALLOC_MD_S: return SBC_SNR; case A2DP_SBC_IE_ALLOC_MD_L: return SBC_LOUDNESS; default: break; } return -1; } int A2DP_GetChannelModeCodeSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.ch_mode) { case A2DP_SBC_IE_CH_MD_MONO: return SBC_MONO; case A2DP_SBC_IE_CH_MD_DUAL: return SBC_DUAL; case A2DP_SBC_IE_CH_MD_STEREO: return SBC_STEREO; case A2DP_SBC_IE_CH_MD_JOINT: return SBC_JOINT_STEREO; default: break; } return -1; } int A2DP_GetSamplingFrequencyCodeSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.samp_freq) { case A2DP_SBC_IE_SAMP_FREQ_16: return SBC_sf16000; case A2DP_SBC_IE_SAMP_FREQ_32: return SBC_sf32000; case A2DP_SBC_IE_SAMP_FREQ_44: return SBC_sf44100; case A2DP_SBC_IE_SAMP_FREQ_48: return SBC_sf48000; default: break; } return -1; } int A2DP_GetMinBitpoolSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, true); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } return sbc_cie.min_bitpool; } int A2DP_GetMaxBitpoolSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, true); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } return sbc_cie.max_bitpool; } int A2DP_GetSinkTrackChannelTypeSbc(const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } switch (sbc_cie.ch_mode) { case A2DP_SBC_IE_CH_MD_MONO: return 1; case A2DP_SBC_IE_CH_MD_DUAL: case A2DP_SBC_IE_CH_MD_STEREO: case A2DP_SBC_IE_CH_MD_JOINT: return 3; default: break; } return -1; } int A2DP_GetSinkFramesCountToProcessSbc(uint64_t time_interval_ms, const uint8_t* p_codec_info) { tA2DP_SBC_CIE sbc_cie; uint32_t freq_multiple; uint32_t num_blocks; uint32_t num_subbands; int frames_to_process; tA2DP_STATUS a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, false); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: cannot decode codec information: %d", __func__, a2dp_status); return -1; } // Check the sample frequency switch (sbc_cie.samp_freq) { case A2DP_SBC_IE_SAMP_FREQ_16: LOG_VERBOSE(LOG_TAG, "%s: samp_freq:%d (16000)", __func__, sbc_cie.samp_freq); freq_multiple = 16 * time_interval_ms; break; case A2DP_SBC_IE_SAMP_FREQ_32: LOG_VERBOSE(LOG_TAG, "%s: samp_freq:%d (32000)", __func__, sbc_cie.samp_freq); freq_multiple = 32 * time_interval_ms; break; case A2DP_SBC_IE_SAMP_FREQ_44: LOG_VERBOSE(LOG_TAG, "%s: samp_freq:%d (44100)", __func__, sbc_cie.samp_freq); freq_multiple = (441 * time_interval_ms) / 10; break; case A2DP_SBC_IE_SAMP_FREQ_48: LOG_VERBOSE(LOG_TAG, "%s: samp_freq:%d (48000)", __func__, sbc_cie.samp_freq); freq_multiple = 48 * time_interval_ms; break; default: LOG_ERROR(LOG_TAG, "%s: unknown frequency: %d", __func__, sbc_cie.samp_freq); return -1; } // Check the channel mode switch (sbc_cie.ch_mode) { case A2DP_SBC_IE_CH_MD_MONO: LOG_VERBOSE(LOG_TAG, "%s: ch_mode:%d (Mono)", __func__, sbc_cie.ch_mode); break; case A2DP_SBC_IE_CH_MD_DUAL: LOG_VERBOSE(LOG_TAG, "%s: ch_mode:%d (DUAL)", __func__, sbc_cie.ch_mode); break; case A2DP_SBC_IE_CH_MD_STEREO: LOG_VERBOSE(LOG_TAG, "%s: ch_mode:%d (STEREO)", __func__, sbc_cie.ch_mode); break; case A2DP_SBC_IE_CH_MD_JOINT: LOG_VERBOSE(LOG_TAG, "%s: ch_mode:%d (JOINT)", __func__, sbc_cie.ch_mode); break; default: LOG_ERROR(LOG_TAG, "%s: unknown channel mode: %d", __func__, sbc_cie.ch_mode); return -1; } // Check the block length switch (sbc_cie.block_len) { case A2DP_SBC_IE_BLOCKS_4: LOG_VERBOSE(LOG_TAG, "%s: block_len:%d (4)", __func__, sbc_cie.block_len); num_blocks = 4; break; case A2DP_SBC_IE_BLOCKS_8: LOG_VERBOSE(LOG_TAG, "%s: block_len:%d (8)", __func__, sbc_cie.block_len); num_blocks = 8; break; case A2DP_SBC_IE_BLOCKS_12: LOG_VERBOSE(LOG_TAG, "%s: block_len:%d (12)", __func__, sbc_cie.block_len); num_blocks = 12; break; case A2DP_SBC_IE_BLOCKS_16: LOG_VERBOSE(LOG_TAG, "%s: block_len:%d (16)", __func__, sbc_cie.block_len); num_blocks = 16; break; default: LOG_ERROR(LOG_TAG, "%s: unknown block length: %d", __func__, sbc_cie.block_len); return -1; } // Check the number of sub-bands switch (sbc_cie.num_subbands) { case A2DP_SBC_IE_SUBBAND_4: LOG_VERBOSE(LOG_TAG, "%s: num_subbands:%d (4)", __func__, sbc_cie.num_subbands); num_subbands = 4; break; case A2DP_SBC_IE_SUBBAND_8: LOG_VERBOSE(LOG_TAG, "%s: num_subbands:%d (8)", __func__, sbc_cie.num_subbands); num_subbands = 8; break; default: LOG_ERROR(LOG_TAG, "%s: unknown number of subbands: %d", __func__, sbc_cie.num_subbands); return -1; } // Check the allocation method switch (sbc_cie.alloc_method) { case A2DP_SBC_IE_ALLOC_MD_S: LOG_VERBOSE(LOG_TAG, "%s: alloc_method:%d (SNR)", __func__, sbc_cie.alloc_method); break; case A2DP_SBC_IE_ALLOC_MD_L: LOG_VERBOSE(LOG_TAG, "%s: alloc_method:%d (Loudness)", __func__, sbc_cie.alloc_method); break; default: LOG_ERROR(LOG_TAG, "%s: unknown allocation method: %d", __func__, sbc_cie.alloc_method); return -1; } LOG_VERBOSE(LOG_TAG, "%s: Bit pool Min:%d Max:%d", __func__, sbc_cie.min_bitpool, sbc_cie.max_bitpool); frames_to_process = ((freq_multiple) / (num_blocks * num_subbands)) + 1; return frames_to_process; } bool A2DP_GetPacketTimestampSbc(UNUSED_ATTR const uint8_t* p_codec_info, const uint8_t* p_data, uint32_t* p_timestamp) { *p_timestamp = *(const uint32_t*)p_data; return true; } bool A2DP_BuildCodecHeaderSbc(UNUSED_ATTR const uint8_t* p_codec_info, BT_HDR* p_buf, uint16_t frames_per_packet) { uint8_t* p; p_buf->offset -= A2DP_SBC_MPL_HDR_LEN; p = (uint8_t*)(p_buf + 1) + p_buf->offset; p_buf->len += A2DP_SBC_MPL_HDR_LEN; A2DP_BuildMediaPayloadHeaderSbc(p, false, false, false, (uint8_t)frames_per_packet); return true; } void A2DP_DumpCodecInfoSbc(const uint8_t* p_codec_info) { tA2DP_STATUS a2dp_status; tA2DP_SBC_CIE sbc_cie; LOG_DEBUG(LOG_TAG, "%s", __func__); a2dp_status = A2DP_ParseInfoSbc(&sbc_cie, p_codec_info, true); if (a2dp_status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: A2DP_ParseInfoSbc fail:%d", __func__, a2dp_status); return; } LOG_DEBUG(LOG_TAG, "\tsamp_freq: 0x%x", sbc_cie.samp_freq); if (sbc_cie.samp_freq & A2DP_SBC_IE_SAMP_FREQ_16) { LOG_DEBUG(LOG_TAG, "\tsamp_freq: (16000)"); } if (sbc_cie.samp_freq & A2DP_SBC_IE_SAMP_FREQ_32) { LOG_DEBUG(LOG_TAG, "\tsamp_freq: (32000)"); } if (sbc_cie.samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) { LOG_DEBUG(LOG_TAG, "\tsamp_freq: (44100)"); } if (sbc_cie.samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) { LOG_DEBUG(LOG_TAG, "\tsamp_freq: (48000)"); } LOG_DEBUG(LOG_TAG, "\tch_mode: 0x%x", sbc_cie.ch_mode); if (sbc_cie.ch_mode & A2DP_SBC_IE_CH_MD_MONO) { LOG_DEBUG(LOG_TAG, "\tch_mode: (Mono)"); } if (sbc_cie.ch_mode & A2DP_SBC_IE_CH_MD_DUAL) { LOG_DEBUG(LOG_TAG, "\tch_mode: (Dual)"); } if (sbc_cie.ch_mode & A2DP_SBC_IE_CH_MD_STEREO) { LOG_DEBUG(LOG_TAG, "\tch_mode: (Stereo)"); } if (sbc_cie.ch_mode & A2DP_SBC_IE_CH_MD_JOINT) { LOG_DEBUG(LOG_TAG, "\tch_mode: (Joint)"); } LOG_DEBUG(LOG_TAG, "\tblock_len: 0x%x", sbc_cie.block_len); if (sbc_cie.block_len & A2DP_SBC_IE_BLOCKS_4) { LOG_DEBUG(LOG_TAG, "\tblock_len: (4)"); } if (sbc_cie.block_len & A2DP_SBC_IE_BLOCKS_8) { LOG_DEBUG(LOG_TAG, "\tblock_len: (8)"); } if (sbc_cie.block_len & A2DP_SBC_IE_BLOCKS_12) { LOG_DEBUG(LOG_TAG, "\tblock_len: (12)"); } if (sbc_cie.block_len & A2DP_SBC_IE_BLOCKS_16) { LOG_DEBUG(LOG_TAG, "\tblock_len: (16)"); } LOG_DEBUG(LOG_TAG, "\tnum_subbands: 0x%x", sbc_cie.num_subbands); if (sbc_cie.num_subbands & A2DP_SBC_IE_SUBBAND_4) { LOG_DEBUG(LOG_TAG, "\tnum_subbands: (4)"); } if (sbc_cie.num_subbands & A2DP_SBC_IE_SUBBAND_8) { LOG_DEBUG(LOG_TAG, "\tnum_subbands: (8)"); } LOG_DEBUG(LOG_TAG, "\talloc_method: 0x%x)", sbc_cie.alloc_method); if (sbc_cie.alloc_method & A2DP_SBC_IE_ALLOC_MD_S) { LOG_DEBUG(LOG_TAG, "\talloc_method: (SNR)"); } if (sbc_cie.alloc_method & A2DP_SBC_IE_ALLOC_MD_L) { LOG_DEBUG(LOG_TAG, "\talloc_method: (Loundess)"); } LOG_DEBUG(LOG_TAG, "\tBit pool Min:%d Max:%d", sbc_cie.min_bitpool, sbc_cie.max_bitpool); } const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceSbc( const uint8_t* p_codec_info) { if (!A2DP_IsSourceCodecValidSbc(p_codec_info)) return NULL; return &a2dp_encoder_interface_sbc; } bool A2DP_AdjustCodecSbc(uint8_t* p_codec_info) { tA2DP_SBC_CIE cfg_cie; if (A2DP_ParseInfoSbc(&cfg_cie, p_codec_info, true) != A2DP_SUCCESS) return false; // Updated the max bitpool if (cfg_cie.max_bitpool > A2DP_SBC_MAX_BITPOOL) { LOG_WARN(LOG_TAG, "%s: Updated the SBC codec max bitpool from %d to %d", __func__, cfg_cie.max_bitpool, A2DP_SBC_MAX_BITPOOL); cfg_cie.max_bitpool = A2DP_SBC_MAX_BITPOOL; } return (A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &cfg_cie, p_codec_info) == A2DP_SUCCESS); } btav_a2dp_codec_index_t A2DP_SourceCodecIndexSbc( UNUSED_ATTR const uint8_t* p_codec_info) { return BTAV_A2DP_CODEC_INDEX_SOURCE_SBC; } const char* A2DP_CodecIndexStrSbc(void) { return "SBC"; } const char* A2DP_CodecIndexStrSbcSink(void) { return "SBC SINK"; } bool A2DP_InitCodecConfigSbc(tAVDT_CFG* p_cfg) { if (A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &a2dp_sbc_caps, p_cfg->codec_info) != A2DP_SUCCESS) { return false; } #if (BTA_AV_CO_CP_SCMS_T == TRUE) /* Content protection info - support SCMS-T */ uint8_t* p = p_cfg->protect_info; *p++ = AVDT_CP_LOSC; UINT16_TO_STREAM(p, AVDT_CP_SCMS_T_ID); p_cfg->num_protect = 1; #endif return true; } bool A2DP_InitCodecConfigSbcSink(tAVDT_CFG* p_cfg) { if (A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &a2dp_sbc_sink_caps, p_cfg->codec_info) != A2DP_SUCCESS) { return false; } return true; } UNUSED_ATTR static void build_codec_config(const tA2DP_SBC_CIE& config_cie, btav_a2dp_codec_config_t* result) { if (config_cie.samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) result->sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100; if (config_cie.samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) result->sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000; result->bits_per_sample = config_cie.bits_per_sample; if (config_cie.ch_mode & A2DP_SBC_IE_CH_MD_MONO) result->channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO; if (config_cie.ch_mode & (A2DP_SBC_IE_CH_MD_STEREO | A2DP_SBC_IE_CH_MD_JOINT | A2DP_SBC_IE_CH_MD_DUAL)) { result->channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } } A2dpCodecConfigSbc::A2dpCodecConfigSbc( btav_a2dp_codec_priority_t codec_priority) : A2dpCodecConfig(BTAV_A2DP_CODEC_INDEX_SOURCE_SBC, "SBC", codec_priority) { // Compute the local capability if (a2dp_sbc_caps.samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) { codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100; } if (a2dp_sbc_caps.samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) { codec_local_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000; } codec_local_capability_.bits_per_sample = a2dp_sbc_caps.bits_per_sample; if (a2dp_sbc_caps.ch_mode & A2DP_SBC_IE_CH_MD_MONO) { codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO; } if (a2dp_sbc_caps.ch_mode & A2DP_SBC_IE_CH_MD_JOINT) { codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } if (a2dp_sbc_caps.ch_mode & A2DP_SBC_IE_CH_MD_STEREO) { codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } if (a2dp_sbc_caps.ch_mode & A2DP_SBC_IE_CH_MD_DUAL) { codec_local_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } } A2dpCodecConfigSbc::~A2dpCodecConfigSbc() {} bool A2dpCodecConfigSbc::init() { if (!isValid()) return false; // Load the encoder if (!A2DP_LoadEncoderSbc()) { LOG_ERROR(LOG_TAG, "%s: cannot load the encoder", __func__); return false; } return true; } bool A2dpCodecConfigSbc::useRtpHeaderMarkerBit() const { return false; } // // Selects the best sample rate from |samp_freq|. // The result is stored in |p_result| and |p_codec_config|. // Returns true if a selection was made, otherwise false. // static bool select_best_sample_rate(uint8_t samp_freq, tA2DP_SBC_CIE* p_result, btav_a2dp_codec_config_t* p_codec_config) { if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) { p_result->samp_freq = A2DP_SBC_IE_SAMP_FREQ_48; p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_48000; return true; } if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) { p_result->samp_freq = A2DP_SBC_IE_SAMP_FREQ_44; p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_44100; return true; } return false; } // // Selects the audio sample rate from |p_codec_audio_config|. // |samp_freq| contains the capability. // The result is stored in |p_result| and |p_codec_config|. // Returns true if a selection was made, otherwise false. // static bool select_audio_sample_rate( const btav_a2dp_codec_config_t* p_codec_audio_config, uint8_t samp_freq, tA2DP_SBC_CIE* p_result, btav_a2dp_codec_config_t* p_codec_config) { switch (p_codec_audio_config->sample_rate) { case BTAV_A2DP_CODEC_SAMPLE_RATE_44100: if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) { p_result->samp_freq = A2DP_SBC_IE_SAMP_FREQ_44; p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_44100; return true; } break; case BTAV_A2DP_CODEC_SAMPLE_RATE_48000: if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) { p_result->samp_freq = A2DP_SBC_IE_SAMP_FREQ_48; p_codec_config->sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_48000; return true; } break; case BTAV_A2DP_CODEC_SAMPLE_RATE_88200: case BTAV_A2DP_CODEC_SAMPLE_RATE_96000: case BTAV_A2DP_CODEC_SAMPLE_RATE_176400: case BTAV_A2DP_CODEC_SAMPLE_RATE_192000: case BTAV_A2DP_CODEC_SAMPLE_RATE_NONE: break; } return false; } // // Selects the best bits per sample. // The result is stored in |p_codec_config|. // Returns true if a selection was made, otherwise false. // static bool select_best_bits_per_sample( btav_a2dp_codec_config_t* p_codec_config) { p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16; return true; } // // Selects the audio bits per sample from |p_codec_audio_config|. // The result is stored in |p_codec_config|. // Returns true if a selection was made, otherwise false. // static bool select_audio_bits_per_sample( const btav_a2dp_codec_config_t* p_codec_audio_config, btav_a2dp_codec_config_t* p_codec_config) { switch (p_codec_audio_config->bits_per_sample) { case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16: p_codec_config->bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16; return true; case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24: case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32: case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE: break; } return false; } // // Selects the best channel mode from |ch_mode|. // The result is stored in |p_result| and |p_codec_config|. // Returns true if a selection was made, otherwise false. // static bool select_best_channel_mode(uint8_t ch_mode, tA2DP_SBC_CIE* p_result, btav_a2dp_codec_config_t* p_codec_config) { if (ch_mode & A2DP_SBC_IE_CH_MD_JOINT) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_JOINT; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; return true; } if (ch_mode & A2DP_SBC_IE_CH_MD_STEREO) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_STEREO; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; return true; } if (ch_mode & A2DP_SBC_IE_CH_MD_DUAL) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_DUAL; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; return true; } if (ch_mode & A2DP_SBC_IE_CH_MD_MONO) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_MONO; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_MONO; return true; } return false; } // // Selects the audio channel mode from |p_codec_audio_config|. // |ch_mode| contains the capability. // The result is stored in |p_result| and |p_codec_config|. // Returns true if a selection was made, otherwise false. // static bool select_audio_channel_mode( const btav_a2dp_codec_config_t* p_codec_audio_config, uint8_t ch_mode, tA2DP_SBC_CIE* p_result, btav_a2dp_codec_config_t* p_codec_config) { switch (p_codec_audio_config->channel_mode) { case BTAV_A2DP_CODEC_CHANNEL_MODE_MONO: if (ch_mode & A2DP_SBC_IE_CH_MD_MONO) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_MONO; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_MONO; return true; } break; case BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO: if (ch_mode & A2DP_SBC_IE_CH_MD_JOINT) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_JOINT; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; return true; } if (ch_mode & A2DP_SBC_IE_CH_MD_STEREO) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_STEREO; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; return true; } if (ch_mode & A2DP_SBC_IE_CH_MD_DUAL) { p_result->ch_mode = A2DP_SBC_IE_CH_MD_DUAL; p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; return true; } break; case BTAV_A2DP_CODEC_CHANNEL_MODE_NONE: break; } return false; } bool A2dpCodecConfigSbc::setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability, uint8_t* p_result_codec_config) { std::lock_guard lock(codec_mutex_); tA2DP_SBC_CIE sink_info_cie; tA2DP_SBC_CIE result_config_cie; uint8_t samp_freq; uint8_t ch_mode; uint8_t block_len; uint8_t num_subbands; uint8_t alloc_method; // Save the internal state btav_a2dp_codec_config_t saved_codec_config = codec_config_; btav_a2dp_codec_config_t saved_codec_capability = codec_capability_; btav_a2dp_codec_config_t saved_codec_selectable_capability = codec_selectable_capability_; btav_a2dp_codec_config_t saved_codec_user_config = codec_user_config_; btav_a2dp_codec_config_t saved_codec_audio_config = codec_audio_config_; uint8_t saved_ota_codec_config[AVDT_CODEC_SIZE]; uint8_t saved_ota_codec_peer_capability[AVDT_CODEC_SIZE]; uint8_t saved_ota_codec_peer_config[AVDT_CODEC_SIZE]; memcpy(saved_ota_codec_config, ota_codec_config_, sizeof(ota_codec_config_)); memcpy(saved_ota_codec_peer_capability, ota_codec_peer_capability_, sizeof(ota_codec_peer_capability_)); memcpy(saved_ota_codec_peer_config, ota_codec_peer_config_, sizeof(ota_codec_peer_config_)); tA2DP_STATUS status = A2DP_ParseInfoSbc(&sink_info_cie, p_peer_codec_info, is_capability); if (status != A2DP_SUCCESS) { LOG_ERROR(LOG_TAG, "%s: can't parse peer's Sink capabilities: error = %d", __func__, status); goto fail; } // Try using the prefered peer codec config (if valid), instead of the peer // capability. if (is_capability && A2DP_IsPeerSinkCodecValidSbc(ota_codec_peer_config_)) { status = A2DP_ParseInfoSbc(&sink_info_cie, ota_codec_peer_config_, false); if (status != A2DP_SUCCESS) { // Use the peer codec capability status = A2DP_ParseInfoSbc(&sink_info_cie, p_peer_codec_info, is_capability); CHECK(status == A2DP_SUCCESS); } } // // Build the preferred configuration // memset(&result_config_cie, 0, sizeof(result_config_cie)); // // Select the sample frequency // samp_freq = a2dp_sbc_caps.samp_freq & sink_info_cie.samp_freq; codec_config_.sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_NONE; switch (codec_user_config_.sample_rate) { case BTAV_A2DP_CODEC_SAMPLE_RATE_44100: if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) { result_config_cie.samp_freq = A2DP_SBC_IE_SAMP_FREQ_44; codec_capability_.sample_rate = codec_user_config_.sample_rate; codec_config_.sample_rate = codec_user_config_.sample_rate; } break; case BTAV_A2DP_CODEC_SAMPLE_RATE_48000: if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) { result_config_cie.samp_freq = A2DP_SBC_IE_SAMP_FREQ_48; codec_capability_.sample_rate = codec_user_config_.sample_rate; codec_config_.sample_rate = codec_user_config_.sample_rate; } break; case BTAV_A2DP_CODEC_SAMPLE_RATE_88200: case BTAV_A2DP_CODEC_SAMPLE_RATE_96000: case BTAV_A2DP_CODEC_SAMPLE_RATE_176400: case BTAV_A2DP_CODEC_SAMPLE_RATE_192000: case BTAV_A2DP_CODEC_SAMPLE_RATE_NONE: codec_capability_.sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_NONE; codec_config_.sample_rate = BTAV_A2DP_CODEC_SAMPLE_RATE_NONE; break; } // Select the sample frequency if there is no user preference do { // Compute the selectable capability if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) { codec_selectable_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100; } if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) { codec_selectable_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000; } if (codec_config_.sample_rate != BTAV_A2DP_CODEC_SAMPLE_RATE_NONE) break; // Compute the common capability if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_44) codec_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_44100; if (samp_freq & A2DP_SBC_IE_SAMP_FREQ_48) codec_capability_.sample_rate |= BTAV_A2DP_CODEC_SAMPLE_RATE_48000; // No user preference - try the codec audio config if (select_audio_sample_rate(&codec_audio_config_, samp_freq, &result_config_cie, &codec_config_)) { break; } // No user preference - try the default config if (select_best_sample_rate( a2dp_sbc_default_config.samp_freq & sink_info_cie.samp_freq, &result_config_cie, &codec_config_)) { break; } // No user preference - use the best match if (select_best_sample_rate(samp_freq, &result_config_cie, &codec_config_)) { break; } } while (false); if (codec_config_.sample_rate == BTAV_A2DP_CODEC_SAMPLE_RATE_NONE) { LOG_ERROR(LOG_TAG, "%s: cannot match sample frequency: source caps = 0x%x " "sink info = 0x%x", __func__, a2dp_sbc_caps.samp_freq, sink_info_cie.samp_freq); goto fail; } // // Select the bits per sample // // NOTE: this information is NOT included in the SBC A2DP codec description // that is sent OTA. codec_config_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE; switch (codec_user_config_.bits_per_sample) { case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16: codec_capability_.bits_per_sample = codec_user_config_.bits_per_sample; codec_config_.bits_per_sample = codec_user_config_.bits_per_sample; break; case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24: case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32: case BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE: codec_capability_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE; codec_config_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE; break; } // Select the bits per sample if there is no user preference do { // Compute the selectable capability codec_selectable_capability_.bits_per_sample = a2dp_sbc_caps.bits_per_sample; if (codec_config_.bits_per_sample != BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE) break; // Compute the common capability codec_capability_.bits_per_sample = BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16; // No user preference - try the codec audio config if (select_audio_bits_per_sample(&codec_audio_config_, &codec_config_)) { break; } // No user preference - try the default config if (select_best_bits_per_sample(&codec_config_)) { break; } // No user preference - use the best match // TODO: no-op - temporary kept here for consistency if (select_best_bits_per_sample(&codec_config_)) { break; } } while (false); if (codec_config_.bits_per_sample == BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE) { LOG_ERROR(LOG_TAG, "%s: cannot match bits per sample: user preference = 0x%x", __func__, codec_user_config_.bits_per_sample); goto fail; } // // Select the channel mode // ch_mode = a2dp_sbc_caps.ch_mode & sink_info_cie.ch_mode; codec_config_.channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_NONE; switch (codec_user_config_.channel_mode) { case BTAV_A2DP_CODEC_CHANNEL_MODE_MONO: if (ch_mode & A2DP_SBC_IE_CH_MD_MONO) { result_config_cie.ch_mode = A2DP_SBC_IE_CH_MD_MONO; codec_capability_.channel_mode = codec_user_config_.channel_mode; codec_config_.channel_mode = codec_user_config_.channel_mode; } break; case BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO: if (ch_mode & A2DP_SBC_IE_CH_MD_JOINT) { result_config_cie.ch_mode = A2DP_SBC_IE_CH_MD_JOINT; codec_capability_.channel_mode = codec_user_config_.channel_mode; codec_config_.channel_mode = codec_user_config_.channel_mode; break; } if (ch_mode & A2DP_SBC_IE_CH_MD_STEREO) { result_config_cie.ch_mode = A2DP_SBC_IE_CH_MD_STEREO; codec_capability_.channel_mode = codec_user_config_.channel_mode; codec_config_.channel_mode = codec_user_config_.channel_mode; break; } if (ch_mode & A2DP_SBC_IE_CH_MD_DUAL) { result_config_cie.ch_mode = A2DP_SBC_IE_CH_MD_DUAL; codec_capability_.channel_mode = codec_user_config_.channel_mode; codec_config_.channel_mode = codec_user_config_.channel_mode; break; } break; case BTAV_A2DP_CODEC_CHANNEL_MODE_NONE: codec_capability_.channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_NONE; codec_config_.channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_NONE; break; } // Select the channel mode if there is no user preference do { // Compute the selectable capability if (ch_mode & A2DP_SBC_IE_CH_MD_MONO) { codec_selectable_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO; } if (ch_mode & A2DP_SBC_IE_CH_MD_JOINT) { codec_selectable_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } if (ch_mode & A2DP_SBC_IE_CH_MD_STEREO) { codec_selectable_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } if (ch_mode & A2DP_SBC_IE_CH_MD_DUAL) { codec_selectable_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } if (codec_config_.channel_mode != BTAV_A2DP_CODEC_CHANNEL_MODE_NONE) break; // Compute the common capability if (ch_mode & A2DP_SBC_IE_CH_MD_MONO) codec_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_MONO; if (ch_mode & (A2DP_SBC_IE_CH_MD_JOINT | A2DP_SBC_IE_CH_MD_STEREO | A2DP_SBC_IE_CH_MD_DUAL)) { codec_capability_.channel_mode |= BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO; } // No user preference - use the codec audio config if (select_audio_channel_mode(&codec_audio_config_, ch_mode, &result_config_cie, &codec_config_)) { break; } // No user preference - try the default config if (select_best_channel_mode( a2dp_sbc_default_config.ch_mode & sink_info_cie.ch_mode, &result_config_cie, &codec_config_)) { break; } // No user preference - use the best match if (select_best_channel_mode(ch_mode, &result_config_cie, &codec_config_)) { break; } } while (false); if (codec_config_.channel_mode == BTAV_A2DP_CODEC_CHANNEL_MODE_NONE) { LOG_ERROR(LOG_TAG, "%s: cannot match channel mode: source caps = 0x%x " "sink info = 0x%x", __func__, a2dp_sbc_caps.ch_mode, sink_info_cie.ch_mode); goto fail; } // // Select the block length // block_len = a2dp_sbc_caps.block_len & sink_info_cie.block_len; if (block_len & A2DP_SBC_IE_BLOCKS_16) { result_config_cie.block_len = A2DP_SBC_IE_BLOCKS_16; } else if (block_len & A2DP_SBC_IE_BLOCKS_12) { result_config_cie.block_len = A2DP_SBC_IE_BLOCKS_12; } else if (block_len & A2DP_SBC_IE_BLOCKS_8) { result_config_cie.block_len = A2DP_SBC_IE_BLOCKS_8; } else if (block_len & A2DP_SBC_IE_BLOCKS_4) { result_config_cie.block_len = A2DP_SBC_IE_BLOCKS_4; } else { LOG_ERROR(LOG_TAG, "%s: cannot match block length: source caps = 0x%x " "sink info = 0x%x", __func__, a2dp_sbc_caps.block_len, sink_info_cie.block_len); goto fail; } // // Select the number of sub-bands // num_subbands = a2dp_sbc_caps.num_subbands & sink_info_cie.num_subbands; if (num_subbands & A2DP_SBC_IE_SUBBAND_8) { result_config_cie.num_subbands = A2DP_SBC_IE_SUBBAND_8; } else if (num_subbands & A2DP_SBC_IE_SUBBAND_4) { result_config_cie.num_subbands = A2DP_SBC_IE_SUBBAND_4; } else { LOG_ERROR(LOG_TAG, "%s: cannot match number of sub-bands: source caps = 0x%x " "sink info = 0x%x", __func__, a2dp_sbc_caps.num_subbands, sink_info_cie.num_subbands); goto fail; } // // Select the allocation method // alloc_method = a2dp_sbc_caps.alloc_method & sink_info_cie.alloc_method; if (alloc_method & A2DP_SBC_IE_ALLOC_MD_L) { result_config_cie.alloc_method = A2DP_SBC_IE_ALLOC_MD_L; } else if (alloc_method & A2DP_SBC_IE_ALLOC_MD_S) { result_config_cie.alloc_method = A2DP_SBC_IE_ALLOC_MD_S; } else { LOG_ERROR(LOG_TAG, "%s: cannot match allocation method: source caps = 0x%x " "sink info = 0x%x", __func__, a2dp_sbc_caps.alloc_method, sink_info_cie.alloc_method); goto fail; } // // Select the min/max bitpool // result_config_cie.min_bitpool = a2dp_sbc_caps.min_bitpool; if (result_config_cie.min_bitpool < sink_info_cie.min_bitpool) result_config_cie.min_bitpool = sink_info_cie.min_bitpool; result_config_cie.max_bitpool = a2dp_sbc_caps.max_bitpool; if (result_config_cie.max_bitpool > sink_info_cie.max_bitpool) result_config_cie.max_bitpool = sink_info_cie.max_bitpool; if (result_config_cie.min_bitpool > result_config_cie.max_bitpool) { LOG_ERROR(LOG_TAG, "%s: cannot match min/max bitpool: " "source caps min/max = 0x%x/0x%x sink info min/max = 0x%x/0x%x", __func__, a2dp_sbc_caps.min_bitpool, a2dp_sbc_caps.max_bitpool, sink_info_cie.min_bitpool, sink_info_cie.max_bitpool); goto fail; } if (A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &result_config_cie, p_result_codec_config) != A2DP_SUCCESS) { goto fail; } // // Copy the codec-specific fields if they are not zero // if (codec_user_config_.codec_specific_1 != 0) codec_config_.codec_specific_1 = codec_user_config_.codec_specific_1; if (codec_user_config_.codec_specific_2 != 0) codec_config_.codec_specific_2 = codec_user_config_.codec_specific_2; if (codec_user_config_.codec_specific_3 != 0) codec_config_.codec_specific_3 = codec_user_config_.codec_specific_3; if (codec_user_config_.codec_specific_4 != 0) codec_config_.codec_specific_4 = codec_user_config_.codec_specific_4; // Create a local copy of the peer codec capability/config, and the // result codec config. if (is_capability) { memcpy(ota_codec_peer_capability_, p_peer_codec_info, sizeof(ota_codec_peer_capability_)); } else { memcpy(ota_codec_peer_config_, p_peer_codec_info, sizeof(ota_codec_peer_config_)); } status = A2DP_BuildInfoSbc(AVDT_MEDIA_TYPE_AUDIO, &result_config_cie, ota_codec_config_); CHECK(status == A2DP_SUCCESS); return true; fail: // Restore the internal state codec_config_ = saved_codec_config; codec_capability_ = saved_codec_capability; codec_selectable_capability_ = saved_codec_selectable_capability; codec_user_config_ = saved_codec_user_config; codec_audio_config_ = saved_codec_audio_config; memcpy(ota_codec_config_, saved_ota_codec_config, sizeof(ota_codec_config_)); memcpy(ota_codec_peer_capability_, saved_ota_codec_peer_capability, sizeof(ota_codec_peer_capability_)); memcpy(ota_codec_peer_config_, saved_ota_codec_peer_config, sizeof(ota_codec_peer_config_)); return false; } A2dpCodecConfigSbcSink::A2dpCodecConfigSbcSink( btav_a2dp_codec_priority_t codec_priority) : A2dpCodecConfig(BTAV_A2DP_CODEC_INDEX_SINK_SBC, "SBC(Sink)", codec_priority) {} A2dpCodecConfigSbcSink::~A2dpCodecConfigSbcSink() {} bool A2dpCodecConfigSbcSink::init() { if (!isValid()) return false; return true; } bool A2dpCodecConfigSbcSink::useRtpHeaderMarkerBit() const { // TODO: This method applies only to Source codecs return false; } bool A2dpCodecConfigSbcSink::setCodecConfig( UNUSED_ATTR const uint8_t* p_peer_codec_info, UNUSED_ATTR bool is_capability, UNUSED_ATTR uint8_t* p_result_codec_config) { // TODO: This method applies only to Source codecs return false; } bool A2dpCodecConfigSbcSink::updateEncoderUserConfig( UNUSED_ATTR const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params, UNUSED_ATTR bool* p_restart_input, UNUSED_ATTR bool* p_restart_output, UNUSED_ATTR bool* p_config_updated) { // TODO: This method applies only to Source codecs return false; } period_ms_t A2dpCodecConfigSbcSink::encoderIntervalMs() const { // TODO: This method applies only to Source codecs return 0; }