541 lines
14 KiB
ReStructuredText
541 lines
14 KiB
ReStructuredText
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耳机(Headset)
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======================================
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:link_to_translation:`en:[English]`
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1. 功能概述
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-------------------------------------
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本工程用于耳机等设备场景，主要功能有
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| 1.作为a2dp sink接收对端传输的音乐数据
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| 2.作为avrcp ct/tg对端进行控制（播放暂停等）
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| 3.作为hfp hf接收对端传输的语音数据
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| 4.ble gatt server/gatt client（可以详见Central工程相关介绍）
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1.1 软件规格
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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* a2dp:
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* avdtp sink
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* avrcp:
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* tg
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* ct
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* hfp:
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* hf
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* ble:
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* gap
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* gatt server
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* gatt client
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* smp legacy pair/secure connection pair
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1.2 代码路径及编译命令
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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Demo路径：`./projects/bluetooth/headset <https://gitlab.bekencorp.com/wifi/armino/-/tree/main/projects/bluetooth/headset>`_
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编译命令：``make bk7258 PROJECT=bluetooth/headset``
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2. cmd命令简介
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-------------------------------------
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2.1 a2dp/avrcp
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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+-------------------------------------------+---------------------+
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| headset connect <xx:xx:xx:xx:xx:xx> | 主动连接对端设备 |
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+-------------------------------------------+---------------------+
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| headset disconnect <xx:xx:xx:xx:xx:xx> | 断开连接 |
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+-------------------------------------------+---------------------+
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| headset play | 播放 |
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+-------------------------------------------+---------------------+
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| headset pause | 暂停 |
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+-------------------------------------------+---------------------+
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| headset next | 下一曲 |
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+-------------------------------------------+---------------------+
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| headset prev | 上一曲 |
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+-------------------------------------------+---------------------+
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| headset rewind [msec] | 快退，可指定时间 |
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+-------------------------------------------+---------------------+
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| headset fast_forward [msec] | 快进，可指定时间 |
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+-------------------------------------------+---------------------+
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| headset vol_up | 音量增加 |
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+-------------------------------------------+---------------------+
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| headset vol_down | 音量减少 |
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+-------------------------------------------+---------------------+
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| headset pair_mode | 进入配对模式 |
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+-------------------------------------------+---------------------+
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3. 框架图
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---------------------------------
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3.1 软件模块架构图
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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如下图所示，bluetooth负责音乐数据接收以及语音数据接收和发送；audio负责对音乐和语音数据解码播放以及采集MIC数据并编码；storage负责蓝牙关键信息存储，比如加密key
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.. figure:: ../../../../_static/bluetooth_headset_arch.png
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:align: center
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:alt: module architecture Overview
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:figclass: align-center
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Figure 1. software module architecture
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3.2 流程图
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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A2DP工作流程和HFP工作流程见下图
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.. figure:: ../../../../_static/bluetooth_headset_a2dp_flow.png
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:align: center
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:alt: a2dp flow Overview
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:figclass: align-center
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Figure 2. a2dp flow chart
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.. figure:: ../../../../_static/bluetooth_headset_hfp_flow.png
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:align: center
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:alt: hfp flow Overview
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:figclass: align-center
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Figure 3. hfp flow chart
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4. 配置
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---------------------------------
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4.1 demo开启配置
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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在工程路径下config/bk7258/config，修改宏来配置是否开启A2DP和HFP demo，当前默认开启A2DP demo；
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| //开启A2DP demo
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| CONFIG_A2DP_SINK_DEMO=y
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| //开启HFP demo
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| CONFIG_HFP_HF_DEMO=y
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4.2 codec方式配置
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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4.2.1 A2DP
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.................................
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+-----------+--------------+----------------------+-----------------------------+
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| | CONFIG_SBC | CONFIG_AAC_DECODER | a2dp_sink_demo_init的参数 |
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+-----------+--------------+----------------------+-----------------------------+
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| 支持SBC | Y | N | 0 |
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+-----------+--------------+----------------------+-----------------------------+
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| 支持AAC | Y | Y | 1 |
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+-----------+--------------+----------------------+-----------------------------+
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4.2.1 HFP
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.................................
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+-----------+--------------+--------------------------+
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| | CONFIG_SBC | hfp_hf_demo_init的参数 |
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+-----------+--------------+--------------------------+
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| 支持CVSD | N | 0 |
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+-----------+--------------+--------------------------+
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| 支持mSBC | Y | 1 |
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+-----------+--------------+--------------------------+
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5. 代码讲解
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---------------------------------
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5.1 A2DP demo
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,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
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5.1.1 获得蓝牙上报的音乐数据
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.................................
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::
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void bt_audio_sink_media_data_ind(const uint8_t *data, uint16_t data_len)
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{
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bt_audio_sink_demo_msg_t demo_msg;
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int rc = -1;
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os_memset(&demo_msg, 0x0, sizeof(bt_audio_sink_demo_msg_t));
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if (bt_audio_sink_demo_msg_que == NULL)
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{
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return;
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}
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demo_msg.data = (char *) os_malloc(data_len);
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if (demo_msg.data == NULL)
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{
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LOGE("%s, malloc failed\r\n", __func__);
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return;
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}
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os_memcpy(demo_msg.data, data, data_len);
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demo_msg.type = BT_AUDIO_D2DP_DATA_IND_MSG;
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demo_msg.len = data_len;
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//发送给audio_sink_demo task
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rc = rtos_push_to_queue(&bt_audio_sink_demo_msg_que, &demo_msg, BEKEN_NO_WAIT);
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...
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}
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5.1.2 把音乐数据按帧暂存ring buffer
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............................................
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::
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void bt_audio_sink_demo_main(void *arg)
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{
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...
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case BT_AUDIO_D2DP_DATA_IND_MSG:
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{
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...
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uint8 *fb = (uint8_t *)msg.data;
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if(s_spk_is_started)
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{
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//对sbc格式数据按帧存入ring buffer
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if (CODEC_AUDIO_SBC == bt_audio_a2dp_sink_codec.type)
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{
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uint8_t payload_header = *fb++;
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uint8_t frame_num = payload_header&0xF;
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if(msg.len - 1 != frame_length*frame_num)
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{
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LOGI("recv undef sbc, payload_header %d, payload_len: %d, frame_num:%d \r\n", payload_header, msg.len - 1, frame_num);
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}
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for(uint8_t i=0;i<frame_num;i++)
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{
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if (ring_buffer_node_get_free_nodes(&s_a2dp_frame_nodes))
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{
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uint8_t *node = ring_buffer_node_get_write_node(&s_a2dp_frame_nodes);
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os_memcpy(node, fb, frame_length);
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fb += frame_length;
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}
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else
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{
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LOGI("A2DP frame nodes buffer(sbc) is full\n");
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//os_free(msg.data);
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break;
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}
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}
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}
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#if CONFIG_AAC_DECODER
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//先解析出AAC格式数据的帧长度，再按帧长度存入ring buffer
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else if(CODEC_AUDIO_AAC == bt_audio_a2dp_sink_codec.type)
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{
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// LOGI("-> %d \n", msg.len);
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uint8_t *inbuf = &fb[9];
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uint32_t inlen = 0;
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uint8_t len = 255;
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do
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{
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inlen += len = *inbuf++;
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}
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while (len == 255);
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{
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if (ring_buffer_node_get_free_nodes(&s_a2dp_frame_nodes))
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{
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uint8_t *node = ring_buffer_node_get_write_node(&s_a2dp_frame_nodes);
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*((uint32_t *)node) = inlen;
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os_memcpy(node + 4, inbuf, inlen);
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}
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else
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{
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LOGI("A2DP frame nodes buffer(aac) is full\n");
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os_free(msg.data);
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break;
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}
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}
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}
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#endif
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else
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{
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LOGE("%s, Unsupported a2dp codec %d \r\n", __func__, bt_audio_a2dp_sink_codec.type);
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}
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if(a2dp_speaker_sema)
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{
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rtos_set_semaphore(&a2dp_speaker_sema);
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}
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}
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...
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}
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break;
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...
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}
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5.1.3 解码音乐数据
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.................................
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::
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static void speaker_task(void *arg)
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{
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...
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for (; i < s_frame; i++)
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{
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//从ring buffer读取
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uint8_t *inbuf = ring_buffer_node_get_read_node(&s_a2dp_frame_nodes);
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bk_err_t ret;
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if (CODEC_AUDIO_SBC == bt_audio_a2dp_sink_codec.type)
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{
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//进行sbc解码
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ret = bk_sbc_decoder_frame_decode(&bt_audio_sink_sbc_decoder, inbuf, frame_length);
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if (ret < 0)
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{
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LOGE("sbc_decoder_decode error <%d>\n", ret);
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continue;
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}
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int16_t *dst = (int16_t*)bt_audio_sink_sbc_decoder.pcm_sample;
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int16_t w_len = bt_audio_sink_sbc_decoder.pcm_length * 4;
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if(CONFIG_BOARD_AUDIO_CHANNLE_NUM == 1)
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{
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for(int i=0; i<bt_audio_sink_sbc_decoder.pcm_length * 2; i++)
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{
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dst[i] = dst[i*2];
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}
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w_len = bt_audio_sink_sbc_decoder.pcm_length * 2;
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}
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//发送解码数据给speaker
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int size = raw_stream_write(raw_write, (char *)dst, w_len);
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if (size <= 0)
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{
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LOGE("raw_stream_write size fail: %d \n", size);
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break;
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}
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else
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{
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//LOGI("raw_stream_write size: %d \n", size);
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}
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}
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#if (CONFIG_AAC_DECODER)
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else if(CODEC_AUDIO_AAC == bt_audio_a2dp_sink_codec.type)
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{
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uint32_t len = *(uint32_t *)inbuf;
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// LOGI("<- %d \n", len);
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uint8_t *out_buf = 0;
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uint32_t out_len = 0;
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//进行aac解码
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ret = bk_aac_decoder_decode(&bt_audio_sink_aac_decoder, (inbuf+4), len, &out_buf, &out_len);
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if(ret == 0)
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{
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int16_t *dst = (int16_t*)out_buf;
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int16_t w_len = out_len;
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if(CONFIG_BOARD_AUDIO_CHANNLE_NUM == 1)
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{
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for(uint16_t i=0;i<out_len/2;i++)
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{
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dst[i] = dst[i*2];
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}
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w_len = out_len/2;
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}
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//发送解码数据给speaker
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int size = raw_stream_write(raw_write, (char *)dst, w_len);
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if (size <= 0)
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{
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LOGE("raw_stream_write size fail: %d \n", size);
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break;
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}
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else
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{
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// LOGI("raw_stream_write size: %d \n", size);
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}
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}else
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{
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LOGE("sbc_decoder_decode error <%d>\n", ret);
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|||
|
|
}
|
|||
|
|
}
|
|||
|
|
#endif
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
LOGE("unsupported codec!! /n");
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
...
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
5.2 HFP demo
|
|||
|
|
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
|
|||
|
|
|
|||
|
|
5.2.1 获得蓝牙上报的语音数据
|
|||
|
|
.................................
|
|||
|
|
|
|||
|
|
::
|
|||
|
|
|
|||
|
|
void bt_audio_hfp_client_voice_data_ind(const uint8_t *data, uint16_t data_len)
|
|||
|
|
{
|
|||
|
|
bt_audio_hf_demo_msg_t demo_msg;
|
|||
|
|
int rc = -1;
|
|||
|
|
|
|||
|
|
os_memset(&demo_msg, 0x0, sizeof(bt_audio_hf_demo_msg_t));
|
|||
|
|
if (bt_audio_hf_demo_msg_que == NULL)
|
|||
|
|
return;
|
|||
|
|
|
|||
|
|
demo_msg.data = (char *) os_malloc(data_len);
|
|||
|
|
if (demo_msg.data == NULL)
|
|||
|
|
{
|
|||
|
|
LOGI("%s, malloc failed\r\n", __func__);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
os_memcpy(demo_msg.data, data, data_len);
|
|||
|
|
demo_msg.type = BT_AUDIO_VOICE_IND_MSG;
|
|||
|
|
demo_msg.len = data_len;
|
|||
|
|
|
|||
|
|
//发送给audio_hf_demo task
|
|||
|
|
rc = rtos_push_to_queue(&bt_audio_hf_demo_msg_que, &demo_msg, BEKEN_NO_WAIT);
|
|||
|
|
...
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
5.2.2 解码语音数据
|
|||
|
|
............................................
|
|||
|
|
|
|||
|
|
::
|
|||
|
|
|
|||
|
|
void bt_audio_hf_demo_main(void *arg)
|
|||
|
|
{
|
|||
|
|
...
|
|||
|
|
|
|||
|
|
case BT_AUDIO_VOICE_IND_MSG:
|
|||
|
|
{
|
|||
|
|
...
|
|||
|
|
//对msbc格式语音数据进行解码
|
|||
|
|
if (CODEC_VOICE_MSBC == bt_audio_hfp_hf_codec)
|
|||
|
|
{
|
|||
|
|
fb += 2; //Skip Synchronization Header
|
|||
|
|
ret = bk_sbc_decoder_frame_decode(&bt_audio_hf_sbc_decoder, fb, msg.len - 2);
|
|||
|
|
// LOGI("sbc decod %d \n", ret);
|
|||
|
|
if (ret < 0)
|
|||
|
|
{
|
|||
|
|
LOGE("msbc decode fail, ret:%d\n", ret);
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
ret = BK_OK;
|
|||
|
|
fb = (uint8_t*)bt_audio_hf_sbc_decoder.pcm_sample;
|
|||
|
|
packet_len = r_len = SCO_MSBC_SAMPLES_PER_FRAME*2;
|
|||
|
|
packet_num = 4;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
packet_len = r_len = SCO_CVSD_SAMPLES_PER_FRAME * 2;
|
|||
|
|
packet_num = 8;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if(ret == BK_OK)
|
|||
|
|
{
|
|||
|
|
...
|
|||
|
|
//把原生语音数据存入hf_speaker_buffer
|
|||
|
|
os_memcpy(hf_speaker_buffer + hf_speaker_data_count, fb, r_len);
|
|||
|
|
hf_speaker_data_count += r_len;
|
|||
|
|
if (hf_speaker_data_count >= packet_len * packet_num)
|
|||
|
|
{
|
|||
|
|
if (hf_speaker_sema)
|
|||
|
|
{
|
|||
|
|
rtos_set_semaphore(&hf_speaker_sema);
|
|||
|
|
}
|
|||
|
|
hf_speaker_data_count -= packet_len * packet_num;
|
|||
|
|
}
|
|||
|
|
}else
|
|||
|
|
{
|
|||
|
|
//LOGE("write spk data fail \r\n");
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
os_free(msg.data);
|
|||
|
|
}
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
...
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
5.2.3 播放语音数据
|
|||
|
|
............................................
|
|||
|
|
|
|||
|
|
::
|
|||
|
|
|
|||
|
|
static void speaker_task(void *arg)
|
|||
|
|
{
|
|||
|
|
...
|
|||
|
|
|
|||
|
|
while (hf_auido_start)
|
|||
|
|
{
|
|||
|
|
rtos_get_semaphore(&hf_speaker_sema, BEKEN_WAIT_FOREVER);
|
|||
|
|
|
|||
|
|
//把hf_speaker_buffer中的语音数据发给SPEAKER
|
|||
|
|
int size = raw_stream_write(raw_write, (char *)hf_speaker_buffer, packet_len);
|
|||
|
|
|
|||
|
|
if (size <= 0)
|
|||
|
|
{
|
|||
|
|
LOGE("raw_stream_write size: %d \n", size);
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
//LOGI("raw_stream_write size: %d \n", size);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
...
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
5.2.4 获取上行MIC数据
|
|||
|
|
.................................
|
|||
|
|
|
|||
|
|
::
|
|||
|
|
|
|||
|
|
static void mic_task(void *arg)
|
|||
|
|
{
|
|||
|
|
...
|
|||
|
|
|
|||
|
|
while (hf_auido_start)
|
|||
|
|
{
|
|||
|
|
if (hf_mic_data_count+read_size < sizeof(hf_mic_sco_data))
|
|||
|
|
{
|
|||
|
|
//获取MIC数据
|
|||
|
|
int size = raw_stream_read(raw_read, (char *)(hf_mic_sco_data + hf_mic_data_count), read_size);
|
|||
|
|
if (size > 0)
|
|||
|
|
{
|
|||
|
|
...
|
|||
|
|
|
|||
|
|
while (hf_mic_data_count >= send_len)
|
|||
|
|
{
|
|||
|
|
//根据选用的编码格式决定是否进行msbc编码
|
|||
|
|
if (CODEC_VOICE_MSBC == bt_audio_hfp_hf_codec)
|
|||
|
|
{
|
|||
|
|
int32_t produced = sbc_encoder_encode(&bt_audio_hf_sbc_encoder, (int16_t *)(hf_mic_sco_data + send_len * i));
|
|||
|
|
// LOGI("[send_mic_data_to_air_msbc] %d \r\n",produced);
|
|||
|
|
//发送编码后的语音数据给蓝牙
|
|||
|
|
bk_bt_hf_client_voice_out_write(hfp_peer_addr, (uint8_t *)&bt_audio_hf_sbc_encoder.stream [ -2 ], produced + 2);
|
|||
|
|
}else
|
|||
|
|
{
|
|||
|
|
//发送未编码的语音数据给蓝牙
|
|||
|
|
bk_bt_hf_client_voice_out_write(hfp_peer_addr, hf_mic_sco_data + send_len * i, send_len);
|
|||
|
|
}
|
|||
|
|
i++;
|
|||
|
|
hf_mic_data_count -= send_len;
|
|||
|
|
}
|
|||
|
|
if (hf_mic_data_count)
|
|||
|
|
{
|
|||
|
|
os_memmove(hf_mic_sco_data, hf_mic_sco_data + send_len * i, hf_mic_data_count);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
LOGE("MIC BUFFER FULL \r\n");
|
|||
|
|
hf_mic_data_count = 0;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
...
|
|||
|
|
}
|