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多个音频文件向下混叠（Down-mix）例程

例程简介

本例程利用 ADF 多输入管道实现了多个音频文件向下混叠 (Down-mix) 的功能，多个管道结构如下图：

mp3 base input stream ---> resample ---> down-mix ---> I2S output stream ---> codec chip
                                           ^
                                           |
mp3 new come input stream ---> resample ---

本例程使用的是双通道 44.1 kHz 采样率的 mp3 为基础音乐，单通道 16 kHz 采样率的 mp3 为混入音频。先对两首音频分别解码和重采样到 48 kHz，然后对 48 kHz 采样率的 PCM 进行了 Down-mix 的功能演示。

本例程的 Downmixing 过程如下图：

        ^
    gain|
        |
        |
        |
        |        base music                       newcome music                         base music
     0dB|—————————————————————————        —————————————————————————————        —————————————————————————————>
        |                          \    /                               \    /
        |                           \  /                                 \  /
        |                            \/                                   \/
        |                            /\                                   /\
        |                           /  \                                 /  \
        |        newcome music     /    \          base music           /    \         newcome music
   -10dB|-------------------------        —————————————————————————————        ------------------------------
        |                         |< t1 >|                             |< t2 >|
        |                       TRANSMITTIME                         TRANSMITTIME
        |                         |
        |                   [mode-key event]
        |
        |----------------------------------------------------------------------------------------------------------->
        |                                                                                                  timeline
        |

环境配置

硬件要求

本例程支持的开发板在 $ADF_PATH/examples/README_CN.md 文档中例程与乐鑫音频开发板的兼容性表格中有标注，表格中标有绿色复选框的开发板均可运行本例程。请记住，如下面的 配置 一节所述，可以在 menuconfig 中选择开发板。

编译和下载

IDF 默认分支

本例程支持 IDF release/v5.0 及以后的分支，例程默认使用 ADF 的內建分支 $ADF_PATH/esp-idf。

配置

本例程需要准备一张 micro sdcard，准备一首音乐作为基础的音乐播放，另再准备一个短小的提示音作为插入混音使用。

本例中需要播放的文件名是固定的，基础音乐命名为 music.mp3 ，插入混音的提示音命名为 tone.mp3。

本例程默认选择的开发板是 ESP32-Lyrat V4.3，如果需要在其他的开发板上运行此例程，则需要在 menuconfig 中选择开发板的配置，例如选择 ESP32-Lyrat-Mini V1.1。

menuconfig > Audio HAL > ESP32-Lyrat-Mini V1.1

本例程建议同时打开 FATFS 长文件名支持。

menuconfig > Component config > FAT Filesystem support > Long filename support

编译和下载

请先编译版本并烧录到开发板上，然后运行 monitor 工具来查看串口输出 (替换 PORT 为端口名称)：

idf.py -p PORT flash monitor

退出调试界面使用 Ctrl-]。

有关配置和使用 ESP-IDF 生成项目的完整步骤，请参阅 《ESP-IDF 编程指南》。

如何使用例程

功能和用法

  • 例程开始运行后，自动播放 sdcard 中的 music.mp3 音乐文件，打印如下：
I (998) AUDIO_ELEMENT: [base_file] AEL_MSG_CMD_RESUME,state:1
I (1005) AUDIO_ELEMENT: [base_mp3] AEL_MSG_CMD_RESUME,state:1
I (1011) MP3_DECODER: MP3 opened
I (1015) ADF_BIT_STREAM: The element is 0x3f8093c4. The reserve data 2 is 0x0.
I (1024) AUDIO_ELEMENT: [base_filter] AEL_MSG_CMD_RESUME,state:1
I (1126) RSP_FILTER: sample rate of source data : 44100, channel of source data : 2, sample rate of destination data : 48000, channel of destination data : 1
I (1133) AUDIO_PIPELINE: Pipeline started
I (1134) FATFS_STREAM: File size: 2911638 byte, file position: 0
I (1143) AUDIO_ELEMENT: [mixer-0x3f806c74] Element task created
I (1165) AUDIO_ELEMENT: [i2s-0x3f806f4c] Element task created
I (1166) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:4300152 Bytes, Inter:307160 Bytes, Dram:236708 Bytes
  • 按下 [mode] 按键后，提示音 tone.mp3 会被混音进来，并且在程序设定的 TRANSMIT TIME 时间内逐渐变化到设定的增益值。
I (1264) DOWNMIX_PIPELINE: [6.0] Base stream pipeline running
I (10923) AUDIO_ELEMENT: [newcome_file-0x3f809238] Element task created
I (10924) AUDIO_ELEMENT: [newcome_mp3-0x3f809534] Element task created
I (10927) AUDIO_ELEMENT: [newcome_filter-0x3f80980c] Element task created
I (10947) AUDIO_ELEMENT: [newcome_raw-0x3f809a54] Element task created
I (10948) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:4277292 Bytes, Inter:293780 Bytes, Dram:223328 Bytes
I (10958) AUDIO_ELEMENT: [newcome_file] AEL_MSG_CMD_RESUME,state:1
I (10965) AUDIO_ELEMENT: [newcome_mp3] AEL_MSG_CMD_RESUME,state:1
I (10971) MP3_DECODER: MP3 opened
I (10976) ADF_BIT_STREAM: The element is 0x3f809534. The reserve data 2 is 0x0.
I (10990) FATFS_STREAM: File size: 20864 byte, file position: 0
I (10991) AUDIO_ELEMENT: [newcome_filter] AEL_MSG_CMD_RESUME,state:1
I (10998) RSP_FILTER: sample rate of source data : 16000, channel of source data : 1, sample rate of destination data : 48000, channel of destination data : 1
I (11016) AUDIO_PIPELINE: Pipeline started
I (11017) DOWNMIX_PIPELINE: New come music running...
I (11082) DOWNMIX: Reopen downmix
W (12009) FATFS_STREAM: No more data, ret:0
I (12009) AUDIO_ELEMENT: IN-[newcome_file] AEL_IO_DONE,0
I (14056) AUDIO_ELEMENT: IN-[newcome_mp3] AEL_IO_DONE,-2
I (14561) MP3_DECODER: Closed
I (14628) AUDIO_ELEMENT: IN-[newcome_filter] AEL_IO_DONE,-2
E (14638) AUDIO_ELEMENT: [newcome_file] Element already stopped
E (14638) AUDIO_ELEMENT: [newcome_mp3] Element already stopped
E (14640) AUDIO_ELEMENT: [newcome_filter] Element already stopped

日志输出

以下为本例程的完整日志。

I (62) boot: Chip Revision: 3
I (71) boot_comm: chip revision: 3, min. bootloader chip revision: 0
I (42) boot: ESP-IDF v3.3.2-107-g722043f73 2nd stage bootloader
I (42) boot: compile time 20:04:22
I (42) boot: Enabling RNG early entropy source...
I (48) boot: SPI Speed      : 80MHz
I (52) boot: SPI Mode       : DIO
I (56) boot: SPI Flash Size : 8MB
I (60) boot: Partition Table:
I (63) boot: ## Label            Usage          Type ST Offset   Length
I (71) boot:  0 nvs              WiFi data        01 02 00009000 00006000
I (78) boot:  1 phy_init         RF data          01 01 0000f000 00001000
I (86) boot:  2 factory          factory app      00 00 00010000 00300000
I (93) boot: End of partition table
I (97) boot_comm: chip revision: 3, min. application chip revision: 0
I (104) esp_image: segment 0: paddr=0x00010020 vaddr=0x3f400020 size=0x17424 ( 95268) map
I (140) esp_image: segment 1: paddr=0x0002744c vaddr=0x3ffb0000 size=0x020e4 (  8420) load
I (143) esp_image: segment 2: paddr=0x00029538 vaddr=0x40080000 size=0x00400 (  1024) load
0x40080000: _WindowOverflow4 at /repo/adfs/bugfix/esp-adf-internal/esp-idf/components/freertos/xtensa_vectors.S:1779

I (147) esp_image: segment 3: paddr=0x00029940 vaddr=0x40080400 size=0x066d0 ( 26320) load
I (164) esp_image: segment 4: paddr=0x00030018 vaddr=0x400d0018 size=0x397b8 (235448) map
0x400d0018: _flash_cache_start at ??:?

I (230) esp_image: segment 5: paddr=0x000697d8 vaddr=0x40086ad0 size=0x081d8 ( 33240) load
0x40086ad0: prvGetItemDefault at /repo/adfs/bugfix/esp-adf-internal/esp-idf/components/esp_ringbuf/ringbuf.c:969

I (250) boot: Loaded app from partition at offset 0x10000
I (251) boot: Disabling RNG early entropy source...
I (251) psram: This chip is ESP32-D0WD
I (255) spiram: Found 64MBit SPI RAM device
I (260) spiram: SPI RAM mode: flash 80m sram 80m
I (265) spiram: PSRAM initialized, cache is in low/high (2-core) mode.
I (273) cpu_start: Pro cpu up.
I (276) cpu_start: Application information:
I (281) cpu_start: Project name:     downmix_pipeline
I (287) cpu_start: App version:      v2.2-112-g7f633143-dirty
I (293) cpu_start: Compile time:     Apr 28 2021 20:04:20
I (299) cpu_start: ELF file SHA256:  3bd9c54c2b4cff94...
I (305) cpu_start: ESP-IDF:          v3.3.2-107-g722043f73
I (312) cpu_start: Starting app cpu, entry point is 0x40081478
0x40081478: call_start_cpu1 at /repo/adfs/bugfix/esp-adf-internal/esp-idf/components/esp32/cpu_start.c:268

I (0) cpu_start: App cpu up.
I (799) spiram: SPI SRAM memory test OK
I (800) heap_init: Initializing. RAM available for dynamic allocation:
I (800) heap_init: At 3FFAE6E0 len 00001920 (6 KiB): DRAM
I (806) heap_init: At 3FFB2B08 len 0002D4F8 (181 KiB): DRAM
I (812) heap_init: At 3FFE0440 len 00003AE0 (14 KiB): D/IRAM
I (818) heap_init: At 3FFE4350 len 0001BCB0 (111 KiB): D/IRAM
I (825) heap_init: At 4008ECA8 len 00011358 (68 KiB): IRAM
I (831) cpu_start: Pro cpu start user code
I (836) spiram: Adding pool of 4096K of external SPI memory to heap allocator
I (185) cpu_start: Starting scheduler on PRO CPU.
I (0) cpu_start: Starting scheduler on APP CPU.
I (186) spiram: Reserving pool of 32K of internal memory for DMA/internal allocations
I (194) DOWNMIX_PIPELINE: [1.0] Start audio codec chip
I (200) gpio: GPIO[19]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (221) gpio: GPIO[21]| InputEn: 0| OutputEn: 1| OpenDrain: 0| Pullup: 0| Pulldown: 0| Intr:0
I (222) ES8388_DRIVER: init,out:02, in:00
I (232) AUDIO_HAL: Codec mode is 2, Ctrl:1
I (235) DOWNMIX_PIPELINE: [2.0] Start and wait for SDCARD to mount
E (237) gpio: gpio_install_isr_service(412): GPIO isr service already installed
I (245) SDCARD: Using 1-line SD mode, 4-line SD mode,  base path=/sdcard
I (300) SDCARD: CID name NCard!

I (753) DOWNMIX_PIPELINE: [3.0] Create pipeline_mix to mix
I (753) DOWNMIX_PIPELINE: [3.1] Create downmixer element
I (754) DOWNMIX_PIPELINE: [3.2] Create i2s stream to read audio data from codec chip
I (761) gpio: GPIO[36]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
I (772) gpio: GPIO[39]| InputEn: 1| OutputEn: 0| OpenDrain: 0| Pullup: 1| Pulldown: 0| Intr:3
W (798) PERIPH_TOUCH: _touch_init
I (799) I2S: DMA Malloc info, datalen=blocksize=1200, dma_buf_count=3
I (799) I2S: DMA Malloc info, datalen=blocksize=1200, dma_buf_count=3
I (807) I2S: APLL: Req RATE: 44100, real rate: 44099.988, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 11289597.000, SCLK: 1411199.625000, diva: 1, divb: 0
I (819) LYRAT_V4_3: I2S0, MCLK output by GPIO0
I (824) DOWNMIX_PIPELINE: [3.3] Link elements together downmixer-->i2s_writer
I (832) DOWNMIX_PIPELINE: [3.4] Link elements together downmixer-->i2s_stream-->[codec_chip]
I (842) AUDIO_PIPELINE: link el->rb, el:0x3f806c74, tag:mixer, rb:0x3f8070a0
I (848) DOWNMIX_PIPELINE: [4.0] Create Fatfs stream to read input data
I (856) DOWNMIX_PIPELINE: [4.1] Create mp3 decoder to decode mp3 file
I (863) MP3_DECODER: MP3 init
I (866) MP3_DECODER: MP3 init
I (870) DOWNMIX_PIPELINE: [4.1] Create resample element
I (876) DOWNMIX_PIPELINE: [4.2] Create raw stream of base wav to write data
I (884) DOWNMIX_PIPELINE: [5.0] Set up  event listener
I (890) AUDIO_PIPELINE: link el->rb, el:0x3f8090e8, tag:base_file, rb:0x3f809c58
I (897) AUDIO_PIPELINE: link el->rb, el:0x3f8093c4, tag:base_mp3, rb:0x3f80bc98
I (905) AUDIO_PIPELINE: link el->rb, el:0x3f80969c, tag:base_filter, rb:0x3f80c4d8
I (914) AUDIO_PIPELINE: link el->rb, el:0x3f809238, tag:newcome_file, rb:0x3f80ce14
I (922) AUDIO_PIPELINE: link el->rb, el:0x3f809534, tag:newcome_mp3, rb:0x3f80ee54
I (930) AUDIO_PIPELINE: link el->rb, el:0x3f80980c, tag:newcome_filter, rb:0x3f80f694
I (939) DOWNMIX_PIPELINE: [5.1] Listening event from peripherals
I (948) I2S: APLL: Req RATE: 48000, real rate: 47999.961, BITS: 16, CLKM: 1, BCK_M: 8, MCLK: 12287990.000, SCLK: 1535998.750000, diva: 1, divb: 0
I (960) AUDIO_ELEMENT: [base_file-0x3f8090e8] Element task created
I (967) AUDIO_ELEMENT: [base_mp3-0x3f8093c4] Element task created
I (974) AUDIO_ELEMENT: [base_filter-0x3f80969c] Element task created
I (980) AUDIO_ELEMENT: [base_raw-0x3f809934] Element task created
I (986) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:4364052 Bytes, Inter:332996 Bytes, Dram:262544 Bytes

I (998) AUDIO_ELEMENT: [base_file] AEL_MSG_CMD_RESUME,state:1
I (1005) AUDIO_ELEMENT: [base_mp3] AEL_MSG_CMD_RESUME,state:1
I (1011) MP3_DECODER: MP3 opened
I (1015) ADF_BIT_STREAM: The element is 0x3f8093c4. The reserve data 2 is 0x0.
I (1024) AUDIO_ELEMENT: [base_filter] AEL_MSG_CMD_RESUME,state:1
I (1126) RSP_FILTER: sample rate of source data : 44100, channel of source data : 2, sample rate of destination data : 48000, channel of destination data : 1
I (1133) AUDIO_PIPELINE: Pipeline started
I (1134) FATFS_STREAM: File size: 2911638 byte, file position: 0
I (1143) AUDIO_ELEMENT: [mixer-0x3f806c74] Element task created
I (1165) AUDIO_ELEMENT: [i2s-0x3f806f4c] Element task created
I (1166) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:4300152 Bytes, Inter:307160 Bytes, Dram:236708 Bytes

I (1174) AUDIO_ELEMENT: [mixer] AEL_MSG_CMD_RESUME,state:1
I (1251) AUDIO_ELEMENT: [i2s] AEL_MSG_CMD_RESUME,state:1
I (1252) I2S_STREAM: AUDIO_STREAM_WRITER
I (1263) AUDIO_PIPELINE: Pipeline started
I (1264) DOWNMIX_PIPELINE: [6.0] Base stream pipeline running
I (10923) AUDIO_ELEMENT: [newcome_file-0x3f809238] Element task created
I (10924) AUDIO_ELEMENT: [newcome_mp3-0x3f809534] Element task created
I (10927) AUDIO_ELEMENT: [newcome_filter-0x3f80980c] Element task created
I (10947) AUDIO_ELEMENT: [newcome_raw-0x3f809a54] Element task created
I (10948) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:4277292 Bytes, Inter:293780 Bytes, Dram:223328 Bytes

I (10958) AUDIO_ELEMENT: [newcome_file] AEL_MSG_CMD_RESUME,state:1
I (10965) AUDIO_ELEMENT: [newcome_mp3] AEL_MSG_CMD_RESUME,state:1
I (10971) MP3_DECODER: MP3 opened
I (10976) ADF_BIT_STREAM: The element is 0x3f809534. The reserve data 2 is 0x0.
I (10990) FATFS_STREAM: File size: 20864 byte, file position: 0
I (10991) AUDIO_ELEMENT: [newcome_filter] AEL_MSG_CMD_RESUME,state:1
I (10998) RSP_FILTER: sample rate of source data : 16000, channel of source data : 1, sample rate of destination data : 48000, channel of destination data : 1
I (11016) AUDIO_PIPELINE: Pipeline started
I (11017) DOWNMIX_PIPELINE: New come music running...
I (11082) DOWNMIX: Reopen downmix
W (12009) FATFS_STREAM: No more data, ret:0
I (12009) AUDIO_ELEMENT: IN-[newcome_file] AEL_IO_DONE,0
I (14056) AUDIO_ELEMENT: IN-[newcome_mp3] AEL_IO_DONE,-2
I (14561) MP3_DECODER: Closed
I (14628) AUDIO_ELEMENT: IN-[newcome_filter] AEL_IO_DONE,-2
E (14638) AUDIO_ELEMENT: [newcome_file] Element already stopped
E (14638) AUDIO_ELEMENT: [newcome_mp3] Element already stopped
E (14640) AUDIO_ELEMENT: [newcome_filter] Element already stopped
I (14707) DOWNMIX: Reopen downmix
I (14756) DOWNMIX_PIPELINE: New come music stoped or finsihed
W (14756) AUDIO_PIPELINE: Without stop, st:1
W (14756) AUDIO_PIPELINE: Without wait stop, st:1
W (14778) AUDIO_ELEMENT: [newcome_file] Element has not create when AUDIO_ELEMENT_TERMINATE
W (14780) AUDIO_ELEMENT: [newcome_mp3] Element has not create when AUDIO_ELEMENT_TERMINATE
W (14788) AUDIO_ELEMENT: [newcome_filter] Element has not create when AUDIO_ELEMENT_TERMINATE
W (14811) AUDIO_ELEMENT: [newcome_raw] Element has not create when AUDIO_ELEMENT_TERMINATE
I (14811) DOWNMIX_PIPELINE: New come music stoped or finsihed
I (19858) AUDIO_ELEMENT: [newcome_file-0x3f809238] Element task created
I (19861) AUDIO_ELEMENT: [newcome_mp3-0x3f809534] Element task created
I (19864) AUDIO_ELEMENT: [newcome_filter-0x3f80980c] Element task created
I (19885) AUDIO_ELEMENT: [newcome_raw-0x3f809a54] Element task created
I (19885) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:4277224 Bytes, Inter:294296 Bytes, Dram:223844 Bytes

I (19894) AUDIO_ELEMENT: [newcome_file] AEL_MSG_CMD_RESUME,state:1
I (19902) AUDIO_ELEMENT: [newcome_mp3] AEL_MSG_CMD_RESUME,state:1
I (19908) MP3_DECODER: MP3 opened
I (19912) ADF_BIT_STREAM: The element is 0x3f809534. The reserve data 2 is 0x0.
I (19933) FATFS_STREAM: File size: 20864 byte, file position: 0
I (19946) AUDIO_ELEMENT: [newcome_filter] AEL_MSG_CMD_RESUME,state:1
I (19949) RSP_FILTER: sample rate of source data : 16000, channel of source data : 1, sample rate of destination data : 48000, channel of destination data : 1
I (19973) AUDIO_PIPELINE: Pipeline started
I (19974) DOWNMIX_PIPELINE: New come music running...
I (20045) DOWNMIX: Reopen downmix
W (20979) FATFS_STREAM: No more data, ret:0
I (20979) AUDIO_ELEMENT: IN-[newcome_file] AEL_IO_DONE,0
I (23016) AUDIO_ELEMENT: IN-[newcome_mp3] AEL_IO_DONE,-2
I (23525) MP3_DECODER: Closed
I (23588) AUDIO_ELEMENT: IN-[newcome_filter] AEL_IO_DONE,-2
E (23598) AUDIO_ELEMENT: [newcome_file] Element already stopped
E (23600) AUDIO_ELEMENT: [newcome_mp3] Element already stopped
E (23602) AUDIO_ELEMENT: [newcome_filter] Element already stopped
I (23669) DOWNMIX: Reopen downmix
I (23732) DOWNMIX_PIPELINE: New come music stoped or finsihed
W (23732) AUDIO_PIPELINE: Without stop, st:1
W (23740) AUDIO_PIPELINE: Without wait stop, st:1
W (23740) AUDIO_ELEMENT: [newcome_file] Element has not create when AUDIO_ELEMENT_TERMINATE
W (23749) AUDIO_ELEMENT: [newcome_mp3] Element has not create when AUDIO_ELEMENT_TERMINATE
W (23758) AUDIO_ELEMENT: [newcome_filter] Element has not create when AUDIO_ELEMENT_TERMINATE
W (23789) AUDIO_ELEMENT: [newcome_raw] Element has not create when AUDIO_ELEMENT_TERMINATE
I (23795) DOWNMIX_PIPELINE: New come music stoped or finsihed
I (36208) AUDIO_ELEMENT: [newcome_file-0x3f809238] Element task created
I (36223) AUDIO_ELEMENT: [newcome_mp3-0x3f809534] Element task created
I (36226) AUDIO_ELEMENT: [newcome_filter-0x3f80980c] Element task created
I (36232) AUDIO_ELEMENT: [newcome_raw-0x3f809a54] Element task created
I (36245) AUDIO_PIPELINE: Func:audio_pipeline_run, Line:359, MEM Total:4277224 Bytes, Inter:294296 Bytes, Dram:223844 Bytes

I (36253) AUDIO_ELEMENT: [newcome_file] AEL_MSG_CMD_RESUME,state:1
I (36270) AUDIO_ELEMENT: [newcome_mp3] AEL_MSG_CMD_RESUME,state:1
I (36271) MP3_DECODER: MP3 opened
I (36273) ADF_BIT_STREAM: The element is 0x3f809534. The reserve data 2 is 0x0.
I (36282) AUDIO_ELEMENT: [newcome_filter] AEL_MSG_CMD_RESUME,state:1
I (36290) RSP_FILTER: sample rate of source data : 16000, channel of source data : 1, sample rate of destination data : 48000, channel of destination data : 1
I (36313) AUDIO_PIPELINE: Pipeline started
I (36313) DOWNMIX_PIPELINE: New come music running...
I (36315) FATFS_STREAM: File size: 20864 byte, file position: 0
I (36382) DOWNMIX: Reopen downmix
W (37317) FATFS_STREAM: No more data, ret:0
I (37317) AUDIO_ELEMENT: IN-[newcome_file] AEL_IO_DONE,0
I (39354) AUDIO_ELEMENT: IN-[newcome_mp3] AEL_IO_DONE,-2
I (39862) MP3_DECODER: Closed
I (39929) AUDIO_ELEMENT: IN-[newcome_filter] AEL_IO_DONE,-2
E (39937) AUDIO_ELEMENT: [newcome_file] Element already stopped
E (39937) AUDIO_ELEMENT: [newcome_mp3] Element already stopped
E (39939) AUDIO_ELEMENT: [newcome_filter] Element already stopped
I (40007) DOWNMIX: Reopen downmix
I (40056) DOWNMIX_PIPELINE: New come music stoped or finsihed
W (40058) AUDIO_PIPELINE: Without stop, st:1
W (40078) AUDIO_PIPELINE: Without wait stop, st:1
W (40078) AUDIO_ELEMENT: [newcome_file] Element has not create when AUDIO_ELEMENT_TERMINATE
W (40083) AUDIO_ELEMENT: [newcome_mp3] Element has not create when AUDIO_ELEMENT_TERMINATE
W (40092) AUDIO_ELEMENT: [newcome_filter] Element has not create when AUDIO_ELEMENT_TERMINATE
W (40111) AUDIO_ELEMENT: [newcome_raw] Element has not create when AUDIO_ELEMENT_TERMINATE
I (40114) DOWNMIX_PIPELINE: New come music stoped or finsihed

故障排除

Down-mix 算法本身的 CPU loading 很低。如果基础音乐和混入音乐解码均为 CPU loading 很高的音频文件（如基础音乐和混入音乐均为 48 kHz 且双通道的 mp3 音频），那么 Down-mix 过程可能出现数据读写的 time out 错误， 听感上有卡顿。建议选择合适的输入音频。

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