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 // enable to send test data 54 // #define HFP_CODEC_TEST 55 56 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 57 #include "btstack_sbc.h" 58 #define FRAME_SIZE_MSBC 57 59 static void hfp_codec_encode_msbc(hfp_codec_t * hfp_codec, int16_t * pcm_samples); 60 #endif 61 62 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 63 #define LC3_SWB_OCTETS_PER_FRAME 58 64 static void hfp_codec_encode_lc3swb(hfp_codec_t * hfp_codec, int16_t * pcm_samples); 65 #endif 66 67 // HFP H2 Framing - might get moved into a hfp_h2.c 68 69 // const 70 static const uint8_t hfp_h2_header_h2_byte_0 = 1; 71 static const uint8_t hfp_h2_header_h2_byte_1_table[] = {0x08, 0x38, 0xc8, 0xf8 }; 72 73 void hfp_h2_framing_init(hfp_h2_framing_t * hfp_h2_framing){ 74 hfp_h2_framing->sequence_number = 0; 75 } 76 77 /** 78 * @brief Add next H2 Header 79 * @param hfp_h2_framing 80 * @param buffer [2] 81 */ 82 void hfp_h2_framing_add_header(hfp_h2_framing_t * hfp_h2_framing, uint8_t * buffer){ 83 // Synchronization Header H2 84 buffer[0] = hfp_h2_header_h2_byte_0; 85 buffer[1] = hfp_h2_header_h2_byte_1_table[hfp_h2_framing->sequence_number]; 86 hfp_h2_framing->sequence_number = (hfp_h2_framing->sequence_number + 1) & 3; 87 } 88 89 90 void hfp_codec_init(hfp_codec_t * hfp_codec, uint8_t codec_id){ 91 memset(hfp_codec, 0, sizeof(hfp_codec_t)); 92 hfp_h2_framing_init(&hfp_codec->h2_framing); 93 switch (codec_id){ 94 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 95 case HFP_CODEC_MSBC: 96 hfp_codec->samples_per_frame = 120; 97 hfp_codec->encode = &hfp_codec_encode_msbc; 98 btstack_sbc_encoder_init(&hfp_codec->msbc_state, SBC_MODE_mSBC, 16, 8, SBC_ALLOCATION_METHOD_LOUDNESS, 16000, 26, SBC_CHANNEL_MODE_MONO); 99 break; 100 #endif 101 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 102 case HFP_CODEC_LC3_SWB: 103 hfp_codec->samples_per_frame = 240; 104 hfp_codec->encode = &hfp_codec_encode_lc3swb; 105 // init lc3 encoder 106 hfp_codec->lc3_encoder = btstack_lc3_encoder_google_init_instance(&hfp_codec->lc3_encoder_context); 107 hfp_codec->lc3_encoder->configure(&hfp_codec->lc3_encoder_context, 32000, BTSTACK_LC3_FRAME_DURATION_7500US, LC3_SWB_OCTETS_PER_FRAME); 108 break; 109 #endif 110 default: 111 btstack_assert(false); 112 break; 113 } 114 } 115 116 bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec){ 117 return hfp_codec->write_pos <= SCO_FRAME_SIZE; 118 } 119 120 uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec){ 121 return hfp_codec->samples_per_frame; 122 } 123 124 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 125 static void hfp_codec_encode_msbc(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 126 // Encode SBC Frame 127 btstack_sbc_encoder_process_data(pcm_samples); 128 (void)memcpy(&hfp_codec->sco_packet[hfp_codec->write_pos], btstack_sbc_encoder_sbc_buffer(), FRAME_SIZE_MSBC); 129 hfp_codec->write_pos += FRAME_SIZE_MSBC; 130 // Final padding to use SCO_FRAME_SIZE bytes 131 hfp_codec->sco_packet[hfp_codec->write_pos++] = 0; 132 } 133 #endif 134 135 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 136 static void hfp_codec_encode_lc3swb(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 137 // Encode LC3 Frame 138 hfp_codec->lc3_encoder->encode_signed_16(&hfp_codec->lc3_encoder_context, pcm_samples, 1, &hfp_codec->sco_packet[hfp_codec->write_pos]); 139 hfp_codec->write_pos += LC3_SWB_OCTETS_PER_FRAME; 140 } 141 #endif 142 143 void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 144 btstack_assert(hfp_codec_can_encode_audio_frame_now(hfp_codec)); 145 // Synchronization Header H2 146 hfp_h2_framing_add_header(&hfp_codec->h2_framing, &hfp_codec->sco_packet[hfp_codec->write_pos]); 147 hfp_codec->write_pos += 2; 148 // encode 149 #ifdef HFP_CODEC_TEST 150 // packet counter 151 static uint8_t counter = 0; 152 hfp_codec->sco_packet[hfp_codec->write_pos++] = counter++; 153 // test data 154 uint8_t i; 155 for (i=3;i<SCO_FRAME_SIZE;i++){ 156 hfp_codec->sco_packet[hfp_codec->write_pos++] = i; 157 } 158 #else 159 hfp_codec->encode(hfp_codec, pcm_samples); 160 #endif 161 log_info("Encode frame, read %u, write %u", hfp_codec->read_pos, hfp_codec->write_pos); 162 } 163 164 uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec){ 165 return hfp_codec->write_pos - hfp_codec->read_pos; 166 } 167 168 void hfp_codec_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buf, uint16_t size){ 169 uint16_t num_bytes_available = hfp_codec_num_bytes_available(hfp_codec); 170 btstack_assert(num_bytes_available >= size); 171 172 uint16_t num_bytes_to_copy = btstack_min(num_bytes_available, size); 173 174 memcpy(buf, &hfp_codec->sco_packet[hfp_codec->read_pos], num_bytes_to_copy); 175 hfp_codec->read_pos += num_bytes_to_copy; 176 177 // reset buffer 178 if (hfp_codec->read_pos == hfp_codec->write_pos){ 179 hfp_codec->read_pos = 0; 180 hfp_codec->write_pos = 0; 181 } 182 183 log_info("Read %u from stream, read %u, write %u", size, hfp_codec->read_pos, hfp_codec->write_pos); 184 } 185 186 void hfp_codec_deinit(hfp_codec_t * hfp_codec){ 187 UNUSED(hfp_codec); 188 } 189