关于left / right / stereo / mono

本文详细解释了机顶盒中音频设置的工作原理,包括Left、Right、Stereo和Mono模式下不同节目源的处理方式,并通过图表清晰展示各种设置下的音频输出效果。

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机顶盒、DVD等类似的家庭娱乐多媒体产品里有音频设置:Left / Right / Stereo / Mono,简单说说在机顶盒里是如何处理的。

1)如果节目源是立体声(Stereo)的。有左(L)右(R)两个声道。

1.1)机顶盒设置为Stereo模式。
机顶盒把左声道数据送到音频输出(譬如莲花端子RCA)的左声道(譬如RCA的白色端口,标记L),把右声道数据送到音频输出的右声道(RCA的红色端口,标记R)。输出到电视上收听时,有立体声效果。

1.2)机顶盒设置为Left模式。
机顶盒把左声道数据同时送到音频输出的左右两个声道。这时只能收听到左声道声音。

1.3)机顶盒设置为Right模式。
机顶盒把右声道数据同时送到音频输出的左右两个声道。这时只能收听到右声道声音。

1.4)机顶盒设置为Mono模式。
机顶盒把左右声道数据复合(我不知道用复合这个词是否准确),同时送到音频输出的左右两个声道。这时,能听到左右声道的声音,但是没有立体声效果。

2)如果节目源只有左声道音频。

2.1)机顶盒设置为Stereo模式。
机顶盒把左声道数据送到音频输出的左声道,右声道没有数据,音频输出的右声道没有声音。

1.2)机顶盒设置为Left模式。
机顶盒把左声道数据同时送到音频输出的左右两个声道。右声道输出能听到左声道的声音。

1.3)机顶盒设置为Right模式。
右声道没有数据,音频输出的左右两个声道都没有声音。这时听不到声音。

1.4)机顶盒设置为Mono模式。
机顶盒把左右声道数据复合,这里等于只有左声道数据,同时送到音频输出的左右两个声道。音频输出的左右声道都有声音。

下面用两张表来重复描述上述情况。音频输出左和音频输出右分别表示只连接左或者右某一个输出端口测试结果。Y表示有声音,N表示没有声音。

节目源STB设置STB音频输出左STB音频输出右
LLeftY(L)Y(L)
LRightN(R)N(R)
LStereoY(L)N(R)
LMonoY(L+0)Y(L+0)

 

 

 

 

 

 

 

 

节目源STB设置STB音频输出左STB音频输出右
R+LLeftLL
R+LRightRR
R+LStereoLR
R+LMonoR+LR+L

 

 

 

 

 

 

 

参考链接:
RCA端子:http://zh.wikipedia.org/zh-cn/RCA%E7%AB%AF%E5%AD%90
关于立体声收音机的“SETREO—MONO”开关:http://blog.sina.com.cn/s/blog_59b9faf10100ag2n.html
RCA:http://en.wikipedia.org/wiki/RCA
Sound Systems:Mono versus Stereo:http://www.mcsquared.com/mono-stereo.htm

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role="source" flags="VOIP_RX"> <profile samplingRates="8000 16000 32000 48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <mixPort name="in_call_music" role="source" flags="INCALL_MUSIC"> <profile samplingRates="8000 16000 32000 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <!-- end of source mixports--> <!-- start of sink mixports--> <mixPort name="primary_in" role="sink" maxOpenCount="2" maxActiveCount="2"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <!-- #ifndef OPLUS_BUG_STABILITY // Jianfeng.Qiu@MULTIMEDIA.AUDIODRIVER.HAL, 2024/05/15, Remove compress-input avoid camera record stop fail <mixPort name="compress_in" role="sink" flags="DIRECT"> <profile name="compress-capture-AAC-LC" samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_STEREO LAYOUT_MONO LAYOUT_FRONT_BACK" formatType="NON_PCM" encoding="audio/mp4a.40.02" /> <profile name="compress-capture-AAC-HE-V1" samplingRates="24000 32000 44100 48000" channelLayouts="LAYOUT_STEREO LAYOUT_MONO LAYOUT_FRONT_BACK" formatType="NON_PCM" encoding="audio/aac-adts.05" /> <profile name="compress-capture-AAC-HE-V2" samplingRates="24000 32000 44100 48000" channelLayouts="LAYOUT_STEREO" formatType="NON_PCM" encoding="audio/aac-adts.29" /> </mixPort> #endif OPLUS_BUG_STABILITY --> <mixPort name="fast_input" role="sink" flags="FAST"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_2POINT1 LAYOUT_2POINT0POINT2 LAYOUT_3POINT0POINT2 LAYOUT_5POINT1" channelMasks="INDEX_MASK_3" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <mixPort name="fast_raw_input" role="sink" flags="FAST RAW"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_2POINT1 LAYOUT_2POINT0POINT2 LAYOUT_3POINT0POINT2 LAYOUT_5POINT1" channelMasks="INDEX_MASK_3" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <mixPort name="voip_record" role="sink" flags="VOIP_TX"> <profile samplingRates="8000 16000 32000 48000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <mixPort name="usb_surround_sound_input" role="sink"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000 88200 96000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK LAYOUT_5POINT1" channelMasks="INDEX_MASK_3 INDEX_MASK_4 INDEX_MASK_6 INDEX_MASK_8" formatType="PCM" pcmType="INT_16_BIT" /> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000 88200 96000 176400 192000" channelLayouts="LAYOUT_5POINT1" channelMasks="INDEX_MASK_6 INDEX_MASK_8" formatType="PCM" pcmType="INT_32_BIT" /> <!-- #ifndef OPLUS_BUG_STABILITY // Jianfeng.Qiu@MULTIMEDIA.AUDIODRIVER.HAL, 2024/05/15, case:2588000, CR-3089619-gerrit-3904059-ps-3.patch fix USB Audio Peripheral Record Test issue <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000 88200 96000 176400 192000" channelLayouts="LAYOUT_5POINT1" channelMasks="INDEX_MASK_6 INDEX_MASK_8" formatType="PCM" pcmType="FLOAT_32_BIT" /> #else /* OPLUS_BUG_STABILITY */ --> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000 88200 96000 176400 192000" channelLayouts="LAYOUT_STEREO LAYOUT_5POINT1" channelMasks="INDEX_MASK_2 INDEX_MASK_6 INDEX_MASK_8" formatType="PCM" pcmType="FLOAT_32_BIT" /> <!-- #endif OPLUS_BUG_STABILITY --> </mixPort> <!-- #ifdef OPLUS_FEATURE_AEC_RECORD --> <!-- Jianfeng.Qiu@MULTIMEDIA.AUDIODRIVER.HAL, 2024/05/15, Add for 4ch aec --> <mixPort name="record_4ch_aec" role="sink"> <profile samplingRates="16000" channelLayouts="LAYOUT_2POINT0POINT2" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <!-- #endif OPLUS_FEATURE_AEC_RECORD --> <!-- #ifdef OPLUS_FEATURE_OCAR_AUDIO --> <!-- Jianfeng.Qiu@MULTIMEDIA.AUDIODRIVER.HAL, 2024/05/15, Modify for support call record in ocar mode --> <!-- <mixPort name="voice_rx" role="sink"> --> <mixPort name="voice_rx" role="sink" maxOpenCount="2" maxActiveCount="2"> <!-- #endif OPLUS_FEATURE_OCAR_AUDIO --> <profile samplingRates="8000 16000 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <mixPort name="mmap_no_irq_in" role="sink" maxOpenCount="1" maxActiveCount="1" flags="MMAP_NOIRQ"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" channelMasks="INDEX_MASK_3" formatType="PCM" pcmType="INT_16_BIT" /> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" channelMasks="INDEX_MASK_3" formatType="PCM" pcmType="INT_24_BIT" /> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" channelMasks="INDEX_MASK_3" formatType="PCM" pcmType="FIXED_Q_8_24" /> </mixPort> <mixPort name="hotword_input" role="sink" flags="HW_HOTWORD"> <profile samplingRates="16000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </mixPort> <!-- end of sink mixports--> </mixPorts> <devicePorts> <!-- start of sink DEVICE PORT --> <devicePort tagName="earpiece" role="sink" attached="true" deviceType="OUT_SPEAKER_EARPIECE"> <profile samplingRates="48000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="speaker" role="sink" attached="true" defaultDevice="true" deviceType="OUT_SPEAKER"> <profile samplingRates="48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="wired_headset" deviceType="OUT_HEADSET" role="sink" connection="analog"> <profile samplingRates="48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="wired_headphones" deviceType="OUT_HEADPHONE" role="sink" connection="analog"> <profile samplingRates="48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="line_out" deviceType="OUT_DEVICE" role="sink" connection="analog"> <profile samplingRates="48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_sco_out" deviceType="OUT_DEVICE" connection="bt-sco" role="sink"> <profile samplingRates="8000 48000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_sco_headset" deviceType="OUT_HEADSET" connection="bt-sco" role="sink"> <profile samplingRates="8000 16000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_sco_car_kit" deviceType="OUT_CARKIT" connection="bt-sco" role="sink"> <profile samplingRates="8000 16000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="telephony_tx" deviceType="OUT_TELEPHONY_TX" role="sink" attached="true"> <profile samplingRates="8000 16000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- Todo check the sanity of below later w.r.t channel layouts --> <devicePort tagName="hdmi_out" deviceType="OUT_DEVICE" connection="hdmi" role="sink"> <profile samplingRates="8000 11025 16000 22050 32000 44100 48000 64000 88200 96000 128000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- Todo check the sanity of below later w.r.t channel layouts --> <devicePort tagName="proxy_out" deviceType="OUT_AFE_PROXY" connection="virtual" role="sink"> <profile samplingRates="8000 11025 16000 22050 32000 44100 48000 64000 88200 96000 128000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- OUT_DEVICE(ip-v4): Usage are not as per android expectation. Due to minimal use of device in regular use case, it is getting used for proxy device in playback usecase --> <devicePort tagName="ip_out" deviceType="OUT_DEVICE" connection="ip-v4" role="sink"> <profile samplingRates="8000 11025 16000 22050 32000 44100 48000 64000 88200 96000 128000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- #ifdef OPLUS_BUG_STABILITY --> <!-- chenwenxiao@MULTIMEDIA.AUDIOSERVER.FRAMEWORK, 2024/08/08, Modify for link to window --> <!-- devicePort tagName="fm_out" deviceType="OUT_FM" role="sink" attached="true"> <profile samplingRates="48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort --> <!-- #endif OPLUS_BUG_STABILITY --> <devicePort tagName="bt_a2dp_out" deviceType="OUT_DEVICE" connection="bt-a2dp" role="sink" encodings="audio/x-sbc audio/mp4a.40 audio/aptx audio/vnd.qcom.aptx.hd audio/vnd.sony.ldac audio/x-celt audio/vnd.qcom.aptx.adaptive audio/vnd.qcom.aptx.twsp audio/x-lc3"> <profile samplingRates="48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_a2dp_headphones" deviceType="OUT_HEADPHONE" connection="bt-a2dp" role="sink" encodings="audio/x-sbc audio/mp4a.40 audio/aptx audio/vnd.qcom.aptx.hd audio/vnd.sony.ldac audio/x-celt audio/vnd.qcom.aptx.adaptive audio/vnd.qcom.aptx.twsp audio/x-lc3"> <profile samplingRates="48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_a2dp_speaker" deviceType="OUT_SPEAKER" connection="bt-a2dp" role="sink" encodings="audio/x-sbc audio/mp4a.40 audio/aptx audio/vnd.qcom.aptx.hd audio/vnd.sony.ldac audio/x-celt audio/vnd.qcom.aptx.adaptive audio/vnd.qcom.aptx.twsp audio/x-lc3"> <profile samplingRates="48000" channelLayouts="LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_ble_headset" deviceType="OUT_HEADSET" connection="bt-le" role="sink" encodings="audio/x-lc3 audio/vnd.qcom.aptx.adaptive.r3 audio/vnd.qcom.aptx.adaptive.r4"> <profile samplingRates="8000 16000 32000 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_ble_speaker" deviceType="OUT_SPEAKER" connection="bt-le" role="sink" encodings="audio/x-lc3 audio/vnd.qcom.aptx.adaptive.r3 audio/vnd.qcom.aptx.adaptive.r4"> <profile samplingRates="8000 16000 32000 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_ble_broadcast" deviceType="OUT_BROADCAST" connection="bt-le" role="sink" encodings="audio/x-lc3"> <profile samplingRates="8000 16000 32000 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="usb_device_out" deviceType="OUT_DEVICE" connection="usb" role="sink"> <profile samplingRates="44100 48000 64000 88200 96000 128000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="usb_headset" deviceType="OUT_HEADSET" connection="usb" role="sink"> <profile samplingRates="44100 48000 64000 88200 96000 128000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- end of sink DEVICE PORT --> <!-- start of source DEVICE PORT --> <devicePort tagName="built_in_mic" deviceType="IN_MICROPHONE" role="source" attached="true" defaultDevice="true" address="bottom"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" formatType="PCM" pcmType="INT_24_BIT" /> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" formatType="PCM" pcmType="INT_16_BIT" /> <!-- To support compress offload capture such that client can query --> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" formatType="NON_PCM" encoding="audio/mp4a.40.02" /> <profile samplingRates="24000 32000 44100 48000" channelLayouts="LAYOUT_STEREO LAYOUT_MONO LAYOUT_FRONT_BACK" formatType="NON_PCM" encoding="audio/aac-adts.05" /> <profile samplingRates="24000 32000 44100 48000" channelLayouts="LAYOUT_STEREO" formatType="NON_PCM" encoding="audio/aac-adts.29" /> </devicePort> <devicePort tagName="built_in_back_mic" deviceType="IN_MICROPHONE_BACK" role="source" attached="true" address="back"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- #ifdef OPLUS_BUG_STABILITY --> <!-- chenwenxiao@MULTIMEDIA.AUDIOSERVER.FRAMEWORK, 2024/08/08, Modify for link to window --> <!-- <devicePort tagName="fm_tuner_mic" deviceType="IN_FM_TUNER" role="source" attached="true"> <profile samplingRates="48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> --> <!-- #endif OPLUS_BUG_STABILITY --> <devicePort tagName="wired_headset_mic" deviceType="IN_HEADSET" connection="analog" role="source"> <profile samplingRates="8000 11025 12000 16000 22050 24000 32000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO LAYOUT_FRONT_BACK" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="proxy_input_device" deviceType="IN_AFE_PROXY" connection="virtual" role="source"> <profile samplingRates="8000 11025 16000 22050 32000 44100 48000 64000 88200 96000 128000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- IN_DEVICE(ip-v4): Usage are not as per android expectation. Due to minimal use of device in regular use case, it is getting used for proxy device in record usecase --> <devicePort tagName="ip_input_device" deviceType="IN_DEVICE" connection="ip-v4" role="source"> <profile samplingRates="8000 11025 16000 22050 32000 44100 48000 64000 88200 96000 128000 176400 192000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_sco_headset_mic" deviceType="IN_HEADSET" connection="bt-sco" role="source"> <profile samplingRates="8000 16000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="telephony_rx" deviceType="IN_TELEPHONY_RX" role="source" attached="true"> <profile samplingRates="8000 16000 48000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="usb_mic" deviceType="IN_DEVICE" connection="usb" role="source" > </devicePort> <devicePort tagName="usb_headset_mic" deviceType="IN_HEADSET" connection="usb" role="source" > </devicePort> <devicePort tagName="bt_a2dp_mic" deviceType="IN_DEVICE" connection="bt-a2dp" role="source" encodings="audio/x-lc3"> <profile samplingRates="44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="bt_le_mic" deviceType="IN_HEADSET" connection="bt-le" role="source" encodings="audio/x-lc3"> <profile samplingRates="8000 16000 24000 44100 48000" channelLayouts="LAYOUT_MONO LAYOUT_STEREO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <devicePort tagName="echo_reference_mic" deviceType="IN_ECHO_REFERENCE" role="source" attached="true"> <profile samplingRates="48000" channelLayouts="LAYOUT_MONO" formatType="PCM" pcmType="INT_16_BIT" /> </devicePort> <!-- end of source DEVICE PORT --> </devicePorts> <routes> <route type="mix" sink="earpiece" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out,telephony_rx" /> <route type="mix" sink="speaker" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out,telephony_rx,spatializer" /> <route type="mix" sink="wired_headset" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out,telephony_rx,spatializer" /> <route type="mix" sink="wired_headphones" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,mmap_no_irq_out,haptics_out,telephony_rx,spatializer" /> <route type="mix" sink="usb_device_out" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out,hifi_playback,telephony_rx,spatializer" /> <route type="mix" sink="usb_headset" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out,hifi_playback,telephony_rx,spatializer" /> <route type="mix" sink="bt_sco_out" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,haptics_out,telephony_rx" /> <route type="mix" sink="bt_sco_headset" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,haptics_out,telephony_rx" /> <route type="mix" sink="bt_sco_car_kit" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,haptics_out,telephony_rx" /> <route type="mix" sink="bt_a2dp_out" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out,spatializer" /> <route type="mix" sink="bt_a2dp_headphones" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out,spatializer" /> <route type="mix" sink="bt_a2dp_speaker" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_playback,raw_out,mmap_no_irq_out,haptics_out" /> <route type="mix" sink="bt_ble_speaker" sources="low_latency_out,deep_buffer_out,direct_pcm_out,compress_offload_out,voip_ 以上文件路径:/odm/etc/audio/audio_module_config_primary.xml 一加13 Coloros15,安卓版本15,修改该文件,绕过安卓音频SRC实现系统全局自适应采样率(Dynamic sampling rates)、自适应位深(Bit_perfect)(保持音频文件原始位深,16bit文件不升级位深)、禁用升频和重采样,关闭所有音频音效(effect)以及影响音频质量无损输出的一切音频处理,最大程度上抑制并降低音频抖动(jitter)(最大化优化时钟管理和同步)、最大程度降低音频失真和噪声以及电源纹波和噪声,以输出输入最干净无污染最高质量的HIFI无损原始音频信号直出,输出修改过的完整文件
最新发布
08-12
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