1 /* 2 * Copyright (C) 2014 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 MATTHIAS 24 * RINGWALD 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 // 40 // HFP mSBC encoder wrapper 41 // 42 // ***************************************************************************** 43 44 #include "btstack_config.h" 45 46 #include <string.h> 47 48 #include "btstack_debug.h" 49 #include "btstack_sbc_encoder.h" 50 #include "hfp_msbc.h" 51 52 #define MSBC_FRAME_SIZE 57 53 54 static btstack_sbc_encoder_state_t state; 55 static uint8_t msbc_padding[] = {0,0,0}; 56 57 static uint8_t msbc_buffer[2*(MSBC_FRAME_SIZE + sizeof(msbc_padding))]; 58 static int msbc_buffer_offset = 0; 59 60 void hfp_msbc_init(void){ 61 btstack_sbc_encoder_init(&state, SBC_MODE_mSBC, 16, 8, 0, 16000, 26); 62 msbc_buffer_offset = 0; 63 } 64 65 int hfp_msbc_can_encode_audio_frame_now(void){ 66 return sizeof(msbc_buffer) - msbc_buffer_offset >= MSBC_FRAME_SIZE + sizeof(msbc_padding); 67 } 68 69 void hfp_msbc_encode_audio_frame(int16_t * pcm_samples){ 70 if (!hfp_msbc_can_encode_audio_frame_now()) return; 71 72 btstack_sbc_encoder_process_data(pcm_samples); 73 74 memcpy(msbc_buffer + msbc_buffer_offset, msbc_padding, sizeof(msbc_padding)); 75 msbc_buffer_offset += sizeof(msbc_padding); 76 77 memcpy(msbc_buffer + msbc_buffer_offset, btstack_sbc_encoder_sbc_buffer(), MSBC_FRAME_SIZE); 78 msbc_buffer_offset += MSBC_FRAME_SIZE; 79 } 80 81 void hfp_msbc_read_from_stream(uint8_t * buf, int size){ 82 int bytes_to_copy = size; 83 if (size > msbc_buffer_offset){ 84 bytes_to_copy = msbc_buffer_offset; 85 log_error("sbc frame storage is smaller then the output buffer"); 86 return; 87 } 88 89 memcpy(buf, msbc_buffer, bytes_to_copy); 90 memmove(msbc_buffer, msbc_buffer + bytes_to_copy, sizeof(msbc_buffer) - bytes_to_copy); 91 msbc_buffer_offset -= bytes_to_copy; 92 } 93 94 int hfp_msbc_num_bytes_in_stream(void){ 95 return msbc_buffer_offset; 96 } 97 98 int hfp_msbc_num_audio_samples_per_frame(void){ 99 return btstack_sbc_encoder_num_audio_samples(); 100 } 101 102 103