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 struct hfp_codec { 64 uint8_t sco_packet[60]; 65 uint16_t read_pos; 66 uint16_t write_pos; 67 uint16_t samples_per_frame; 68 hfp_h2_framing_t h2_framing; 69 void (*encode)(struct hfp_codec * hfp_codec, int16_t * pcm_samples); 70 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 71 btstack_sbc_encoder_state_t msbc_state; 72 #endif 73 #ifdef ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 74 const btstack_lc3_encoder_t * lc3_encoder; 75 btstack_lc3_encoder_google_t lc3_encoder_context; 76 #endif 77 }; 78 79 /* API_START */ 80 81 typedef struct hfp_codec hfp_codec_t; 82 83 /** 84 * @brief Initialize HFP Audio Codec 85 * @note btstack_assert if codec_id is not supported 86 * @param hfp_codec 87 * @param codec_id see HFP_CODEC_xxx in hfp.h 88 * @return status 89 */ 90 void hfp_codec_init(hfp_codec_t * hfp_codec, uint8_t codec_id); 91 92 /** 93 * @brief Get number of audio samples per HFP SCO frame 94 * @param hfp_codec 95 * @return num audio samples per 7.5ms SCO packet 96 */ 97 uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec); 98 99 /** 100 * @brief Checks if next frame can be encoded 101 * @param hfp_codec 102 */ 103 bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec); 104 105 /** 106 * Get number of bytes ready for sending 107 * @param hfp_codec 108 * @return num bytes ready for current packet 109 */ 110 uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec); 111 112 /** 113 * Encode audio samples for HFP SCO packet 114 * @param hfp_codec 115 * @param pcm_samples - complete audio frame of hfp_msbc_num_audio_samples_per_frame int16 samples 116 */ 117 void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples); 118 119 /** 120 * Read from stream into SCO packet buffer 121 * @param hfp_codec 122 * @param buffer to store stream 123 * @param size num bytes to read from stream 124 */ 125 void hfp_codec_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buffer, uint16_t size); 126 127 /** 128 * @param hfp_codec 129 */ 130 void hfp_codec_deinit(hfp_codec_t * hfp_codec); 131 132 /* API_END */ 133 134 #if defined __cplusplus 135 } 136 #endif 137 138 #endif 139