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 #if defined __cplusplus 56 extern "C" { 57 #endif 58 59 struct hfp_codec { 60 uint8_t sco_packet[60]; 61 uint16_t read_pos; 62 uint16_t write_pos; 63 uint16_t samples_per_frame; 64 hfp_h2_framing_t h2_framing; 65 void (*encode)(struct hfp_codec * hfp_codec, int16_t * pcm_samples); 66 #ifdef ENABLE_HFP_WIDE_BAND_SPEECH 67 btstack_sbc_encoder_state_t msbc_state; 68 #endif 69 }; 70 71 /* API_START */ 72 73 typedef struct hfp_codec hfp_codec_t; 74 75 /** 76 * @brief Initialize HFP Audio Codec 77 * @note btstack_assert if codec_id is not supported 78 * @param hfp_codec 79 * @param codec_id see HFP_CODEC_xxx in hfp.h 80 * @return status 81 */ 82 void hfp_codec_init(hfp_codec_t * hfp_codec, uint8_t codec_id); 83 84 /** 85 * @brief Get number of audio samples per HFP SCO frame 86 * @param hfp_codec 87 * @return num audio samples per 7.5ms SCO packet 88 */ 89 uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec); 90 91 /** 92 * @brief Checks if next frame can be encoded 93 * @param hfp_codec 94 */ 95 bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec); 96 97 /** 98 * Get number of bytes ready for sending 99 * @param hfp_codec 100 * @return num bytes ready for current packet 101 */ 102 uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec); 103 104 /** 105 * Encode audio samples for HFP SCO packet 106 * @param hfp_codec 107 * @param pcm_samples - complete audio frame of hfp_msbc_num_audio_samples_per_frame int16 samples 108 */ 109 void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples); 110 111 /** 112 * Read from stream into SCO packet buffer 113 * @param hfp_codec 114 * @param buffer to store stream 115 * @param size num bytes to read from stream 116 */ 117 void hfp_codec_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buffer, uint16_t size); 118 119 /** 120 * @param hfp_codec 121 */ 122 void hfp_codec_deinit(hfp_codec_t * hfp_codec); 123 124 /* API_END */ 125 126 #if defined __cplusplus 127 } 128 #endif 129 130 #endif 131