[V2X]音频数据流图

Playback / Recording / Voice 三种场景的音频数据流框图：
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span{fill:#e3f2fd!important;stroke:#1565c0!important;}#mermaid-svg-nAP2CEPsCFL66meU .bpStyle>*{fill:#fff3e0!important;stroke:#e65100!important;}#mermaid-svg-nAP2CEPsCFL66meU .bpStyle span{fill:#fff3e0!important;stroke:#e65100!important;}#mermaid-svg-nAP2CEPsCFL66meU .hwStyle>*{fill:#e8f5e9!important;stroke:#2e7d32!important;}#mermaid-svg-nAP2CEPsCFL66meU .hwStyle span{fill:#e8f5e9!important;stroke:#2e7d32!important;}#mermaid-svg-nAP2CEPsCFL66meU .bridgeStyle>*{fill:#fce4ec!important;stroke:#c62828!important;}#mermaid-svg-nAP2CEPsCFL66meU .bridgeStyle span{fill:#fce4ec!important;stroke:#c62828!important;}#mermaid-svg-nAP2CEPsCFL66meU .voiceStyle>*{fill:#f3e5f5!important;stroke:#7b1fa2!important;}#mermaid-svg-nAP2CEPsCFL66meU .voiceStyle span{fill:#f3e5f5!important;stroke:#7b1fa2!important;} 硬件层
BP 侧 (SPF on Modem DSP)
AP ↔ BP 边界
AP 侧 (AudioReach)
Voice 专用 (VCPM)
SPF 容器 (gen_cntr)
APM 音频处理管理器
GPR 接收
ALSA / Kernel
AGM 层
PAL 层
① Playback PCM
pcm_write
pcm_read
② Recording PCM
控制: 图配置
App / TelSDK
pal_stream_open/write/read
StreamPCM
SessionAlsaPcm / SessionAlsaVoice
graph_open/start
graph_write → gsl_write(SHMEM)
pcm_write / pcm_read

虚拟 FE PCM
gpr-lite.c

gpr_send_pkt → rpmsg
audio-pkt.c

共享内存映射
snd-soc-dummy-dai

虚拟 DAI
GPR 共享内存 Ring Buffer

SHMEM_ENDPOINT
glink modem_apps

控制命令 + 数据通知
gpr_lx.c
apm_gpr_cmd_handler

CREATE/OPEN/START/STOP
apm_graph_db
rt_proxy

读/写共享内存
模块链

gain → MFC → MBDRC → IIR
AudioIF

LPAIF I2S 驱动
VCPM 语音容器
VOICE_FLUENCE_SMECNS

EC + NS
Modem Baseband

AMR/EVS 编解码
PRI/SEC/TERT MI2S_RX

播放
PRI/SEC/TERT MI2S_TX

录音
Codec (ES8311/AK7759)

DAC / ADC
Speaker / Handset
Mic
Network

三种场景对比

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┌─────────────────────────────────────────────────────────────────────────────┐
│                        音频数据流三种模式对比                                │
├─────────────┬──────────────────────┬──────────────────────────────────────┤
│   场景      │   数据是否过 AP 内存    │   数据通道                            │
├─────────────┼──────────────────────┼──────────────────────────────────────┤
│  Playback   │  ✅ 必过              │  App → pcm_write → GPR共享内存         │
│  (播放)     │                      │  → rt_proxy → SPF模块链 → I2S → Codec │
├─────────────┼──────────────────────┼──────────────────────────────────────┤
│  Recording  │  ✅ 必过              │  Mic → Codec → I2S → SPF模块链       │
│  (录音)     │                      │  → rt_proxy → GPR共享内存 → pcm_read  │
├─────────────┼──────────────────────┼──────────────────────────────────────┤
│  Voice Call │  ❌ 不过              │  Mic → Codec → I2S → LPASS/Modem     │
│  (通话)     │  (AP仅发配置命令)      │  → 网络 (全在 Modem 域内闭环)         │
└─────────────┴──────────────────────┴──────────────────────────────────────┘

分层架构简图

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┌─────────────────────────────────────────────────────────────────┐
│  Application Layer          TelSDK / 第三方 App                  │
├─────────────────────────────────────────────────────────────────┤
│  PAL (策略层)               StreamPCM / SessionAlsaVoice       │
│                             resourcemanager.xml 设备路由        │
├─────────────────────────────────────────────────────────────────┤
│  AGM (图管理层)             graph_open/write + ACDB GKV/CKV    │
├─────────────────────────────────────────────────────────────────┤
│  ALSA / Kernel (AP)         虚拟 FE PCM + gpr-lite + audio-pkt   │
├═════════════════════════════╪═══════════════════════════════════┤  ← AP/BP 边界
│  GPR 共享内存 + glink       SHMEM_ENDPOINT / modem_apps        │
├═════════════════════════════╪═══════════════════════════════════┤
│  GPR (BP)                   gpr_lx.c 接收                       │
├─────────────────────────────────────────────────────────────────┤
│  APM (图管理)               apm_gpr_cmd_handler 生命周期管理    │
├─────────────────────────────────────────────────────────────────┤
│  SPF 容器                   gen_cntr / VCPM + 模块链            │
│                             rt_proxy / gain / MFC / AudioIF     │
├─────────────────────────────────────────────────────────────────┤
│  AudioIF / LPAIF            I2S BCLK/WS/DATA 硬件接口控制        │
├─────────────────────────────────────────────────────────────────┤
│  Codec (外接)               ES8311 / AK7759  DAC/ADC            │
├─────────────────────────────────────────────────────────────────┤
│  物理设备                    Speaker / Mic / Handset / Headset  │
└─────────────────────────────────────────────────────────────────┘

设备路由（MI2S 接口分配）

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                    ┌──────────────┐
                    │  LPASS I2S   │
                    └──────┬───────┘
           ┌───────────────┼───────────────┐
           ▼               ▼               ▼
    PRI_MI2S          SEC_MI2S        TERT_MI2S
    (PRIMARY)        (SECONDARY)      (TERTIARY)
           │               │               │
    ┌──────┴──────┐ ┌──────┴──────┐ ┌──────┴──────┐
    │ ES8311      │ │ NAU8810     │ │ ES8311      │
    │ Speaker     │ │ Handset     │ │ Headphone   │
    │ Speaker Mic │ │ Handset Mic │ │ Headset Mic │
    └─────────────┘ └─────────────┘ └─────────────┘

    AUXPCM ─── Bluetooth SCO 通话