插着耳机看TV或听MP4时，来闹铃或电话等打断后，耳机端声音突然变大
[SOLUTION]来自半导体社区
问题原因：
插着耳机进TV，此时是耳机模式，输出设备是耳机，而来闹铃后，因为闹铃是耳机和外放都有声音，输出设备是耳机和
外放一起，
当闹铃停掉后再进TV，在获取音量时使用的device是both即耳机和外放，所以导致获取的音频参数值是用normal的音频
参数，音量变大。
修改方法：
在aud_audio.c文件中aud_audio_set_volume_req_hdlr函数里修改，去掉红色字体部分的code
void aud_audio_set_volume_req_hdlr(ilm_struct *ilm_ptr)
{
...
case AUD_VOLUME_MEDIA:
if (req_p->apply)
{
#ifdef __MED_VID_DEC_MOD__
if (vid_is_dummy_aud_playing() == KAL_FALSE)
#endif /* __MED_VID_DEC_MOD__ */
{
/* if it's headset mode and output to both earphone & loud speaker, use normal mode
gain value */
if (aud_context_p->audio_mode == AUD_MODE_HEADSET &&
aud_context_p->melody_output_device == AUDIO_DEVICE_SPEAKER_BOTH)
{
aud_melody_set_volume_by_mode(VOL_NORMAL, req_p->volume);
}
#if defined(TV_OUT_SUPPORT)
/* TV out is on, and audio output to TV only */
else if (audio_tv_cable_in &&
!audio_tv_loud_speaker &&
aud_context_p->melody_output_device != AUDIO_DEVICE_SPEAKER_BOTH)
{
aud_melody_set_volume_by_mode(VOL_TV_OUT, req_p->volume);
}
#endif /* TV_OUT_SUPPORT */
else
{
aud_melody_set_volume_by_mode(aud_context_p->audio_mode, req_p->volume);
}
current_playing_melody_volume_level = req_p->volume;
}
/* disable audio mute when the volume is set again */
aud_context_p->audio_mute = KAL_FALSE;
}
break;
...
#ifdef __ATV_SUPPORT__
case AUD_VOLUME_ATV:
/* if it's headset mode and output to both earphone & loud speaker, use normal mode gain
value */
if (aud_context_p->audio_mode == AUD_MODE_HEADSET &&
aud_context_p->melody_output_device == AUDIO_DEVICE_SPEAKER_BOTH)
{
aud_atv_set_volume_by_mode(VOL_NORMAL, req_p->volume);
}
#if defined(TV_OUT_SUPPORT)
/* TV out is on, and audio output to TV only */
else if (audio_tv_cable_in &&
!audio_tv_loud_speaker &&
aud_context_p->melody_output_device != AUDIO_DEVICE_SPEAKER_BOTH)
{
aud_atv_set_volume_by_mode(VOL_TV_OUT, req_p->volume);
}
#endif /* TV_OUT_SUPPORT */
else
{
aud_atv_set_volume_by_mode(aud_context_p->audio_mode, req_p->volume);
}
current_playing_melody_volume_level = req_p->volume;
/* disable audio mute when the volume is set again */
aud_context_p->audio_mute = KAL_FALSE;
break;
#endif /* __ATV_SUPPORT__ */
...
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