RK平台上的声卡是怎样进行切换的求解

先把packages/apps/Settings/src/com/android/settings/notification/NotificationSettings.java中如下部分注释掉。Setting把UI打开。
         mSoundDevices = findPreference(KEY_SOUND_DEVICES);
161 /*paul change        if(!"box".equals(SystemProperties.get("ro.target.product","tablet"))){
162 //          getPreferenceScreen().removePreference(mSoundDevices);
163   //        getPreferenceScreen().removePreference(soundmange);
164     //      soundmange = null;
165       //    mSoundDevices = null;
166         //  Log.d(TAG,"remove SoundDevices======");
167 */ //paul change         }
168         /*$_rbox_$_modify_$_zhangxueguang_$_end_$_20120409_$*/
169     }
将如下补丁打入hardware/rockchip/audio/tinyalsa_hal/audio_hw.c文件中。
diff --git a/tinyalsa_hal/audio_hw.c b/tinyalsa_hal/audio_hw.c
index 6cc0a1c..3b38f9f 100755
--- a/tinyalsa_hal/audio_hw.c
+++ b/tinyalsa_hal/audio_hw.c
@@ -509,6 +509,10 @@ static int start_output_stream(struct stream_out *out)
         /*BOX hdmi & codec use the same i2s,so only config the codec card*/
         out->device &= ~AUDIO_DEVICE_OUT_SPEAKER;
     }
+    property_get("persist.audio.currentplayback", value, "");
+    if (8 == atoi(value)) {
+        out->device = AUDIO_DEVICE_OUT_SPDIF;
+    }
#endif
     ALOGD("Audio HAL start_output_stream  out->device = 0x%x",out->device);
     route_pcm_open(getRouteFromDevice(out->device));
并且在 hardware/rockchip/audio/tinyalsa_hal/audio_hw.h中定义“BOX_HAL”这个宏。
驱动中rk3288.dtsi如下部分对原来的进行替换
spdif: rockchip-spdif@0xff8b0000 {
compatible = "rockchip-spdif";
//reg = <0xff8b0000 0x10000>;  //8channel
reg = <0xff880000 0x10000>;//2channel
clocks = <&clk_spdif>, <&clk_spdif_8ch>,<&clk_gates10 10>;
clock-names = "spdif_mclk","spdif_8ch_mclk","spdif_hclk";
interrupts = ;
dmas = <&pdma0 2>;
//dmas = <&pdma0 2>; //2channel
//#dma-cells = <1>;
dma-names = "tx";
pinctrl-names = "default";
pinctrl-0 = <&spdif_tx>;
};
rk3288-tb_8846.dts中 format = "i2s"注释去掉。
154     rockchip-hdmi-i2s {
155         status = "okay";
156         compatible = "rockchip-hdmi-i2s";
157         dais {
158             dai0 {
159                 audio-codec = <&codec_hdmi_i2s>;
160                 audio-controller = <&i2s>;
161                 format = "i2s";
162                 //continuous-clock;
163                 //bitclock-inversion;
164                 //frame-inversion;
165                 //bitclock-master;
166                 //frame-master;
167             };
168         };
169     };
然后将附件中audio_policy.conf  push到/etc目录下。
audio_policy.conf内容如下
# Global configuration section: lists input and output devices always present on the device
# as well as the output device selected by default.
# Devices are designated by a string that corresponds to the enum in audio.h
global_configuration {
attached_output_devices AUDIO_DEVICE_OUT_SPEAKER
default_output_device AUDIO_DEVICE_OUT_SPEAKER
attached_input_devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_REMOTE_SUBMIX
}
# audio hardware module section: contains descriptors for all audio hw modules present on the
# device. Each hw module node is named after the corresponding hw module library base name.
# For instance, "primary" corresponds to audio.primary..so.
# The "primary" module is mandatory and must include at least one output with
# AUDIO_OUTPUT_FLAG_PRIMARY flag.
# Each module descriptor contains one or more output profile descriptors and zero or more
# input profile descriptors. Each profile lists all the parameters supported by a given output
# or input stream category.
# The "channel_masks", "formats", "devices" and "flags" are specified using strings corresponding
# to enums in audio.h and audio_policy.h. They are concatenated by use of "|" without space or "n".
audio_hw_modules {
primary {
outputs {
primary {
sampling_rates 44100|48000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_EARPIECE|AUDIO_DEVICE_OUT_SPEAKER|AUDIO_DEVICE_OUT_WIRED_HEADSET|AUDIO_DEVICE_OUT_WIRED_HEADPHONE|AUDIO_DEVICE_OUT_ALL_SCO|AUDIO_DEVICE_OUT_AUX_DIGITAL|AUDIO_DEVICE_OUT_SPDIF
flags AUDIO_OUTPUT_FLAG_PRIMARY
}
spdif_passthrough {
sampling_rates 44100|48000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_SPDIF
flags AUDIO_OUTPUT_FLAG_DIRECT
}
hdmi {
sampling_rates 44100|48000|192000
channel_masks AUDIO_CHANNEL_OUT_5POINT1|AUDIO_CHANNEL_OUT_STEREO|AUDIO_CHANNEL_OUT_7POINT1
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_AUX_DIGITAL
flags AUDIO_OUTPUT_FLAG_DIRECT
}
}
inputs {
primary {
sampling_rates 8000|11025|16000|22050|32000|44100|48000
channel_masks AUDIO_CHANNEL_IN_MONO|AUDIO_CHANNEL_IN_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_IN_BUILTIN_MIC|AUDIO_DEVICE_IN_BLUETOOTH_SCO_HEADSET|AUDIO_DEVICE_IN_WIRED_HEADSET
}
}
}
a2dp {
outputs {
a2dp {
sampling_rates 44100
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_ALL_A2DP
}
}
}
u*** {
outputs {
u***_accessory {
sampling_rates 44100
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_USB_ACCESSORY
}
u***_device {
sampling_rates dynamic
channel_masks dynamic
formats dynamic
devices AUDIO_DEVICE_OUT_USB_DEVICE
}
}
inputs {
u***_device {
sampling_rates dynamic
channel_masks AUDIO_CHANNEL_IN_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_IN_USB_DEVICE
}
}
}
r_submix {
outputs {
submix {
sampling_rates 48000
channel_masks AUDIO_CHANNEL_OUT_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_OUT_REMOTE_SUBMIX
}
}
inputs {
submix {
sampling_rates 48000
channel_masks AUDIO_CHANNEL_IN_STEREO
formats AUDIO_FORMAT_PCM_16_BIT
devices AUDIO_DEVICE_IN_REMOTE_SUBMIX
}
}
}
}

原作者：胡杨122

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