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Platform: Rockchip OS: Android 7.1.2 Kernel: 4.4 问题分析 当插上USB录音设备开机时,由于USB声卡被优先挂载,导致系统声卡不出声音,因此需要将系统声卡固定成默认播放声卡 解决方案 1、使用cat proc/asound/cards命令打印出系统声卡的名字。 2、在系统中强制使用系统声卡做为默认声卡 --- a/hardware/rockchip/audio/tinyalsa_hal/alsa_route.c +++ b/hardware/rockchip/audio/tinyalsa_hal/alsa_route.c @@ -58,26 +58,26 @@ struct mixer* mMixerCapture; */ int route_init(void) { - char soundCardID[20] = ""; + char soundCardID[20] = "rockchipes8316c"; static FILE * fp; unsigned i, config_count = sizeof(sound_card_config_list) / sizeof(struct alsa_sound_card_config); - size_t read_size; + size_t read_size=15; ALOGV("route_init()"); - fp = fopen("/proc/asound/card0/id", "rt"); - if (!fp) { - ALOGE("Open sound card0 id error!"); - } else { - read_size = fread(soundCardID, sizeof(char), sizeof(soundCardID), fp); - fclose(fp); + //fp = fopen("/proc/asound/card0/id", "rt"); + //if (!fp) { + // ALOGE("Open sound card0 id error!"); + //} else { + // read_size = fread(soundCardID, sizeof(char), sizeof(soundCardID), fp); + // fclose(fp); if (soundCardID[read_size - 1] == 'n') { read_size--; soundCardID[read_size] = ' |