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classic: introduce hfp_codec.c, replacing hfp_msbc, ready for other codecs
This commit is contained in:
Matthias Ringwald
parent
515a576f9b
commit
a602f23dae
130
src/classic/hfp_codec.c
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130
src/classic/hfp_codec.c
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/*
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* Copyright (C) 2023 BlueKitchen GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* 4. Any redistribution, use, or modification is done solely for
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* personal benefit and not for any commercial purpose or for
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* monetary gain.
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*
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* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
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* GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Please inquire about commercial licensing options at
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* contact@bluekitchen-gmbh.com
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*
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*/
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#define BTSTACK_FILE__ "hfp_codec.c"
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// *****************************************************************************
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//
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// HFP Codec
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//
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// *****************************************************************************
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#include "btstack_config.h"
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#include <string.h>
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#include "hfp_codec.h"
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#include "btstack_debug.h"
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#ifdef ENABLE_HFP_WIDE_BAND_SPEECH
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#include "btstack_sbc.h"
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#define FRAME_SIZE_MSBC 57
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static void hfp_codec_encode_msbc(hfp_codec_t * hfp_codec, int16_t * pcm_samples);
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#endif
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#include "hfp_codec.h"
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void hfp_codec_init(hfp_codec_t * hfp_codec, uint8_t codec_id){
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memset(hfp_codec, 0, sizeof(hfp_codec_t));
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hfp_h2_framing_init(&hfp_codec->h2_framing);
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switch (codec_id){
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#ifdef ENABLE_HFP_WIDE_BAND_SPEECH
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case HFP_CODEC_MSBC:
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hfp_codec->samples_per_frame = 120;
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hfp_codec->encode = &hfp_codec_encode_msbc;
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btstack_sbc_encoder_init(&hfp_codec->msbc_state, SBC_MODE_mSBC, 16, 8, SBC_ALLOCATION_METHOD_LOUDNESS, 16000, 26, SBC_CHANNEL_MODE_MONO);
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break;
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#endif
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default:
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btstack_assert(false);
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break;
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}
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}
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bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec){
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return hfp_codec->read_pos == hfp_codec->write_pos;
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}
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uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec){
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return hfp_codec->samples_per_frame;
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}
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#ifdef ENABLE_HFP_WIDE_BAND_SPEECH
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static void hfp_codec_encode_msbc(hfp_codec_t * hfp_codec, int16_t * pcm_samples){
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// Synchronization Header H2
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hfp_h2_framing_add_header(&hfp_codec->h2_framing, hfp_codec->sco_packet);
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hfp_codec->write_pos += 2;
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// Encode SBC Frame
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btstack_sbc_encoder_process_data(pcm_samples);
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(void)memcpy(&hfp_codec->sco_packet[hfp_codec->write_pos],
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btstack_sbc_encoder_sbc_buffer(), FRAME_SIZE_MSBC);
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hfp_codec->write_pos += FRAME_SIZE_MSBC;
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// Final padding to use 60 bytes
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hfp_codec->sco_packet[hfp_codec->write_pos++] = 0;
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}
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#endif
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void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples){
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btstack_assert(hfp_codec_can_encode_audio_frame_now(hfp_codec));
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// reset packet buffer
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hfp_codec->read_pos = 0;
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hfp_codec->write_pos = 0;
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// encode
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hfp_codec->encode(hfp_codec, pcm_samples);
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}
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uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec){
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return hfp_codec->write_pos - hfp_codec->read_pos;
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}
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void hfp_msbc_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buf, int size){
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uint16_t num_bytes_available = hfp_codec_num_bytes_available(hfp_codec);
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btstack_assert(num_bytes_available >= size);
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uint16_t num_bytes_to_copy = btstack_min(num_bytes_available, size);
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memcpy(buf, &hfp_codec->sco_packet[hfp_codec->read_pos], num_bytes_to_copy);
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hfp_codec->read_pos += num_bytes_to_copy;
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}
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void hfp_codec_deinit(hfp_codec_t * hfp_codec){
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UNUSED(hfp_codec);
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}
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130
src/classic/hfp_codec.h
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130
src/classic/hfp_codec.h
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@ -0,0 +1,130 @@
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/*
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* Copyright (C) 2023 BlueKitchen GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* 4. Any redistribution, use, or modification is done solely for
|
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* personal benefit and not for any commercial purpose or for
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* monetary gain.
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*
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* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
|
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
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* GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Please inquire about commercial licensing options at
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* contact@bluekitchen-gmbh.com
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*
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*/
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/**
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* @title HFP Audio Encoder
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* @brief Create SCO packet with H2 Synchronization Header and encoded audio samples
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*/
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#ifndef HFP_CODEC_H
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#define HFP_CODEC_H
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#include "btstack_config.h"
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#include "hfp.h" // hfp_h2_framing
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#include <stdint.h>
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#ifdef ENABLE_HFP_WIDE_BAND_SPEECH
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#include "btstack_sbc.h"
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#endif
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#if defined __cplusplus
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extern "C" {
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#endif
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struct hfp_codec {
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uint8_t sco_packet[60];
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uint16_t read_pos;
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uint16_t write_pos;
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uint16_t samples_per_frame;
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hfp_h2_framing_t h2_framing;
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void (*encode)(struct hfp_codec * hfp_codec, int16_t * pcm_samples);
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#ifdef ENABLE_HFP_WIDE_BAND_SPEECH
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btstack_sbc_encoder_state_t msbc_state;
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#endif
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};
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/* API_START */
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typedef struct hfp_codec hfp_codec_t;
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/**
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* @brief Initialize HFP Audio Codec
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* @note btstack_assert if codec_id is not supported
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* @param hfp_codec
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* @param codec_id see HFP_CODEC_xxx in hfp.h
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* @return status
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*/
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void hfp_codec_init(hfp_codec_t * hfp_codec, uint8_t codec_id);
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/**
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* @brief Get number of audio samples per HFP SCO frame
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* @param hfp_codec
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* @return num audio samples per 7.5ms SCO packet
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*/
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uint16_t hfp_codec_num_audio_samples_per_frame(const hfp_codec_t * hfp_codec);
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/**
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* @brief Checks if next frame can be encoded
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* @param hfp_codec
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*/
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bool hfp_codec_can_encode_audio_frame_now(const hfp_codec_t * hfp_codec);
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/**
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* Get number of bytes ready for sending
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* @param hfp_codec
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* @return num bytes ready for current packet
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*/
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uint16_t hfp_codec_num_bytes_available(const hfp_codec_t * hfp_codec);
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/**
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* Encode audio samples for HFP SCO packet
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* @param hfp_codec
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* @param pcm_samples - complete audio frame of hfp_msbc_num_audio_samples_per_frame int16 samples
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*/
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void hfp_codec_encode_audio_frame(hfp_codec_t * hfp_codec, int16_t * pcm_samples);
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/**
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* Read from stream into SCO packet buffer
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* @param hfp_codec
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* @param buffer to store stream
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* @param size num bytes to read from stream
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*/
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void hfp_codec_read_from_stream(hfp_codec_t * hfp_codec, uint8_t * buffer, uint16_t size);
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/**
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* @param hfp_codec
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*/
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void hfp_codec_deinit(hfp_codec_t * hfp_codec);
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/* API_END */
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#if defined __cplusplus
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}
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#endif
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#endif
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