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 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 90 void hfp_codec_init_msbc(hfp_codec_t * hfp_codec, btstack_sbc_encoder_state_t * msbc_encoder_context){ 91 memset(hfp_codec, 0, sizeof(hfp_codec_t)); 92 hfp_h2_framing_init(&hfp_codec->h2_framing); 93 hfp_codec->samples_per_frame = 120; 94 hfp_codec->encode = &hfp_codec_encode_msbc; 95 hfp_codec->msbc_encoder_context = msbc_encoder_context; 96 btstack_sbc_encoder_init(hfp_codec->msbc_encoder_context, SBC_MODE_mSBC, 16, 8, SBC_ALLOCATION_METHOD_LOUDNESS, 16000, 26, SBC_CHANNEL_MODE_MONO); 97 } 98 #endif 99 100 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 101 void hfp_codec_init_lc3_swb(hfp_codec_t * hfp_codec, const btstack_lc3_encoder_t * lc3_encoder, void * lc3_encoder_context){ 102 memset(hfp_codec, 0, sizeof(hfp_codec_t)); 103 hfp_h2_framing_init(&hfp_codec->h2_framing); 104 hfp_codec->samples_per_frame = 240; 105 hfp_codec->encode = &hfp_codec_encode_lc3swb; 106 // init lc3 encoder 107 hfp_codec->lc3_encoder = lc3_encoder; 108 hfp_codec->lc3_encoder_context = lc3_encoder_context; 109 hfp_codec->lc3_encoder->configure(&hfp_codec->lc3_encoder_context, 32000, BTSTACK_LC3_FRAME_DURATION_7500US, LC3_SWB_OCTETS_PER_FRAME); 110 } 111 #endif 112 113 bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec){ 114 return hfp_codec->write_pos <= SCO_FRAME_SIZE; 115 } 116 117 uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec){ 118 return hfp_codec->samples_per_frame; 119 } 120 121 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 122 static void hfp_codec_encode_msbc(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 123 // Encode SBC Frame 124 btstack_sbc_encoder_process_data(pcm_samples); 125 (void)memcpy(&hfp_codec->sco_packet[hfp_codec->write_pos], btstack_sbc_encoder_sbc_buffer(), FRAME_SIZE_MSBC); 126 hfp_codec->write_pos += FRAME_SIZE_MSBC; 127 // Final padding to use SCO_FRAME_SIZE bytes 128 hfp_codec->sco_packet[hfp_codec->write_pos++] = 0; 129 } 130 #endif 131 132 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 133 static void hfp_codec_encode_lc3swb(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 134 // Encode LC3 Frame 135 hfp_codec->lc3_encoder->encode_signed_16(&hfp_codec->lc3_encoder_context, pcm_samples, 1, &hfp_codec->sco_packet[hfp_codec->write_pos]); 136 hfp_codec->write_pos += LC3_SWB_OCTETS_PER_FRAME; 137 } 138 #endif 139 140 void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples){ 141 btstack_assert(hfp_codec_can_encode_audio_frame_now(hfp_codec)); 142 // Synchronization Header H2 143 hfp_h2_framing_add_header(&hfp_codec->h2_framing, &hfp_codec->sco_packet[hfp_codec->write_pos]); 144 hfp_codec->write_pos += 2; 145 // encode 146 #ifdef HFP_CODEC_TEST 147 // packet counter 148 static uint8_t counter = 0; 149 hfp_codec->sco_packet[hfp_codec->write_pos++] = counter++; 150 // test data 151 uint8_t i; 152 for (i=3;i<SCO_FRAME_SIZE;i++){ 153 hfp_codec->sco_packet[hfp_codec->write_pos++] = i; 154 } 155 #else 156 hfp_codec->encode(hfp_codec, pcm_samples); 157 #endif 158 log_info("Encode frame, read %u, write %u", hfp_codec->read_pos, hfp_codec->write_pos); 159 } 160 161 uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec){ 162 return hfp_codec->write_pos - hfp_codec->read_pos; 163 } 164 165 void hfp_codec_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buf, uint16_t size){ 166 uint16_t num_bytes_available = hfp_codec_num_bytes_available(hfp_codec); 167 btstack_assert(num_bytes_available >= size); 168 169 uint16_t num_bytes_to_copy = btstack_min(num_bytes_available, size); 170 171 memcpy(buf, &hfp_codec->sco_packet[hfp_codec->read_pos], num_bytes_to_copy); 172 hfp_codec->read_pos += num_bytes_to_copy; 173 174 // reset buffer 175 if (hfp_codec->read_pos == hfp_codec->write_pos){ 176 hfp_codec->read_pos = 0; 177 hfp_codec->write_pos = 0; 178 } 179 180 log_info("Read %u from stream, read %u, write %u", size, hfp_codec->read_pos, hfp_codec->write_pos); 181 } 182 183 void hfp_codec_deinit(hfp_codec_t * hfp_codec){ 184 UNUSED(hfp_codec); 185 } 186