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 /** 39 * @title HFP Audio Encoder 40 * @brief Create SCO packet with H2 Synchronization Header and encoded audio samples 41 */ 42 43 #ifndef HFP_CODEC_H 44 #define HFP_CODEC_H 45 46 #include "btstack_config.h" 47 #include "hfp.h" // hfp_h2_framing 48 49 #include <stdint.h> 50 51 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 52 #include "btstack_sbc.h" 53 #endif 54 55 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 56 #include "btstack_lc3_google.h" 57 #endif 58 59 #if defined __cplusplus 60 extern "C" { 61 #endif 62 63 #define SCO_FRAME_SIZE 60 64 65 struct hfp_codec { 66 // to allow for 24 byte USB payloads, we encode up to two SCO packets 67 uint8_t sco_packet[2*SCO_FRAME_SIZE]; 68 uint16_t read_pos; 69 uint16_t write_pos; 70 uint16_t samples_per_frame; 71 hfp_h2_framing_t h2_framing; 72 void (*encode)(struct hfp_codec * hfp_codec, int16_t * pcm_samples); 73 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 74 btstack_sbc_encoder_state_t msbc_state; 75 #endif 76 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 77 const btstack_lc3_encoder_t * lc3_encoder; 78 btstack_lc3_encoder_google_t lc3_encoder_context; 79 #endif 80 }; 81 82 /* API_START */ 83 84 typedef struct hfp_codec hfp_codec_t; 85 86 /** 87 * @brief Initialize HFP Audio Codec 88 * @note btstack_assert if codec_id is not supported 89 * @param hfp_codec 90 * @param codec_id see HFP_CODEC_xxx in hfp.h 91 * @return status 92 */ 93 void hfp_codec_init(hfp_codec_t * hfp_codec, uint8_t codec_id); 94 95 /** 96 * @brief Get number of audio samples per HFP SCO frame 97 * @param hfp_codec 98 * @return num audio samples per 7.5ms SCO packet 99 */ 100 uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec); 101 102 /** 103 * @brief Checks if next frame can be encoded 104 * @param hfp_codec 105 */ 106 bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec); 107 108 /** 109 * Get number of bytes ready for sending 110 * @param hfp_codec 111 * @return num bytes ready for current packet 112 */ 113 uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec); 114 115 /** 116 * Encode audio samples for HFP SCO packet 117 * @param hfp_codec 118 * @param pcm_samples - complete audio frame of hfp_msbc_num_audio_samples_per_frame int16 samples 119 */ 120 void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples); 121 122 /** 123 * Read from stream into SCO packet buffer 124 * @param hfp_codec 125 * @param buffer to store stream 126 * @param size num bytes to read from stream 127 */ 128 void hfp_codec_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buffer, uint16_t size); 129 130 /** 131 * @param hfp_codec 132 */ 133 void hfp_codec_deinit(hfp_codec_t * hfp_codec); 134 135 /* API_END */ 136 137 #if defined __cplusplus 138 } 139 #endif 140 141 #endif 142