1 /* 2 * Copyright (C) 2023 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "hfp_codec.c" 39 40 // ***************************************************************************** 41 // 42 // HFP Codec 43 // 44 // ***************************************************************************** 45 46 #include "btstack_config.h" 47 48 #include <string.h> 49 50 #include "hfp_codec.h" 51 #include "btstack_debug.h" 52 53 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 54 #include "btstack_sbc.h" 55 #define FRAME_SIZE_MSBC 57 56 static void hfp_codec_encode_msbc(hfp_codec_t * hfp_codec, int16_t * pcm_samples); 57 #endif 58 59 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 60 #define LC3_SWB_OCTETS_PER_FRAME 58 61 static void hfp_codec_encode_lc3swb(hfp_codec_t * hfp_codec, int16_t * pcm_samples); 62 #endif 63 64 #include "hfp_codec.h" 65 66 void hfp_codec_init(hfp_codec_t * hfp_codec, uint8_t codec_id){ 67 memset(hfp_codec, 0, sizeof(hfp_codec_t)); 68 hfp_h2_framing_init(&hfp_codec->h2_framing); 69 switch (codec_id){ 70 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 71 case HFP_CODEC_MSBC: 72 hfp_codec->samples_per_frame = 120; 73 hfp_codec->encode = &hfp_codec_encode_msbc; 74 btstack_sbc_encoder_init(&hfp_codec->msbc_state, SBC_MODE_mSBC, 16, 8, SBC_ALLOCATION_METHOD_LOUDNESS, 16000, 26, SBC_CHANNEL_MODE_MONO); 75 break; 76 #endif 77 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 78 case HFP_CODEC_LC3_SWB: 79 hfp_codec->samples_per_frame = 240; 80 hfp_codec->encode = &hfp_codec_encode_lc3swb; 81 // init lc3 encoder 82 hfp_codec->lc3_encoder = btstack_lc3_encoder_google_init_instance(&hfp_codec->lc3_encoder_context); 83 hfp_codec->lc3_encoder->configure(&hfp_codec->lc3_encoder_context, 32000, BTSTACK_LC3_FRAME_DURATION_7500US, LC3_SWB_OCTETS_PER_FRAME); 84 break; 85 #endif 86 default: 87 btstack_assert(false); 88 break; 89 } 90 } 91 92 bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec){ 93 return hfp_codec->read_pos == hfp_codec->write_pos; 94 } 95 96 uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec){ 97 return hfp_codec->samples_per_frame; 98 } 99 100 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 101 static void hfp_codec_encode_msbc(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 102 // Synchronization Header H2 103 hfp_h2_framing_add_header(&hfp_codec->h2_framing, hfp_codec->sco_packet); 104 hfp_codec->write_pos += 2; 105 106 // Encode SBC Frame 107 btstack_sbc_encoder_process_data(pcm_samples); 108 (void)memcpy(&hfp_codec->sco_packet[hfp_codec->write_pos], 109 btstack_sbc_encoder_sbc_buffer(), FRAME_SIZE_MSBC); 110 hfp_codec->write_pos += FRAME_SIZE_MSBC; 111 112 // Final padding to use 60 bytes 113 hfp_codec->sco_packet[hfp_codec->write_pos++] = 0; 114 } 115 #endif 116 117 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 118 static void hfp_codec_encode_lc3swb(hfp_codec_t * hfp_codec, int16_t * pcm_samples) { 119 // Synchronization Header H2 120 hfp_h2_framing_add_header(&hfp_codec->h2_framing, hfp_codec->sco_packet); 121 hfp_codec->write_pos += 2; 122 123 // Encode LC3 Frame 124 hfp_codec->lc3_encoder->encode_signed_16(&hfp_codec->lc3_encoder_context, pcm_samples, 1, &hfp_codec->sco_packet[hfp_codec->write_pos]); 125 hfp_codec->write_pos += LC3_SWB_OCTETS_PER_FRAME; 126 } 127 #endif 128 129 void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 130 btstack_assert(hfp_codec_can_encode_audio_frame_now(hfp_codec)); 131 132 // reset packet buffer 133 hfp_codec->read_pos = 0; 134 hfp_codec->write_pos = 0; 135 136 // encode 137 hfp_codec->encode(hfp_codec, pcm_samples); 138 } 139 140 uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec){ 141 return hfp_codec->write_pos - hfp_codec->read_pos; 142 } 143 void hfp_codec_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buf, uint16_t size){ 144 uint16_t num_bytes_available = hfp_codec_num_bytes_available(hfp_codec); 145 btstack_assert(num_bytes_available >= size); 146 147 uint16_t num_bytes_to_copy = btstack_min(num_bytes_available, size); 148 149 memcpy(buf, &hfp_codec->sco_packet[hfp_codec->read_pos], num_bytes_to_copy); 150 hfp_codec->read_pos += num_bytes_to_copy; 151 } 152 153 void hfp_codec_deinit(hfp_codec_t * hfp_codec){ 154 UNUSED(hfp_codec); 155 } 156