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author | Jean-Michel Trivi <jmtrivi@google.com> | 2015-09-24 02:15:28 +0000 |
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committer | Android Git Automerger <android-git-automerger@android.com> | 2015-09-24 02:15:28 +0000 |
commit | da3d511f7d5313cfcbfc8f496e1801d9dcf3c2d2 (patch) | |
tree | d7050eb57115e6de96b68512c63e28253e6d109a | |
parent | 550f6d33701c3f5ed5dd3ac40e9e1e6b5de680e5 (diff) | |
parent | 88cbad341d2dd920ac74c2296f319482bd53a33d (diff) | |
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am 88cbad34: Ramp speaker gain when swapping L/R channels for ACDB change
* commit '88cbad341d2dd920ac74c2296f319482bd53a33d':
Ramp speaker gain when swapping L/R channels for ACDB change
-rw-r--r-- | hal/msm8974/platform.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/hal/msm8974/platform.c b/hal/msm8974/platform.c index 83e2f912..7078a1dd 100644 --- a/hal/msm8974/platform.c +++ b/hal/msm8974/platform.c @@ -2428,6 +2428,67 @@ done: return ret; } +#define DEFAULT_NOMINAL_SPEAKER_GAIN 20 +int ramp_speaker_gain(struct audio_device *adev, bool ramp_up, int target_ramp_up_gain) { + // backup_gain: gain to try to set in case of an error during ramp + int start_gain, end_gain, step, backup_gain, i; + bool error = false; + const struct mixer_ctl *ctl; + const char *mixer_ctl_name_gain_left = "Left Speaker Gain"; + const char *mixer_ctl_name_gain_right = "Right Speaker Gain"; + struct mixer_ctl *ctl_left = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name_gain_left); + struct mixer_ctl *ctl_right = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name_gain_right); + if (!ctl_left || !ctl_right) { + ALOGE("%s: Could not get ctl for mixer cmd - %s or %s, not applying speaker gain ramp", + __func__, mixer_ctl_name_gain_left, mixer_ctl_name_gain_right); + return -EINVAL; + } else if ((mixer_ctl_get_num_values(ctl_left) != 1) + || (mixer_ctl_get_num_values(ctl_right) != 1)) { + ALOGE("%s: Unexpected num values for mixer cmd - %s or %s, not applying speaker gain ramp", + __func__, mixer_ctl_name_gain_left, mixer_ctl_name_gain_right); + return -EINVAL; + } + if (ramp_up) { + start_gain = 0; + end_gain = target_ramp_up_gain > 0 ? target_ramp_up_gain : DEFAULT_NOMINAL_SPEAKER_GAIN; + step = +1; + backup_gain = end_gain; + } else { + // using same gain on left and right + const int left_gain = mixer_ctl_get_value(ctl_left, 0); + start_gain = left_gain > 0 ? left_gain : DEFAULT_NOMINAL_SPEAKER_GAIN; + end_gain = 0; + step = -1; + backup_gain = start_gain; + } + for (i = start_gain ; i != (end_gain + step) ; i += step) { + //ALOGV("setting speaker gain to %d", i); + if (mixer_ctl_set_value(ctl_left, 0, i)) { + ALOGE("%s: error setting %s to %d during gain ramp", + __func__, mixer_ctl_name_gain_left, i); + error = true; + break; + } + if (mixer_ctl_set_value(ctl_right, 0, i)) { + ALOGE("%s: error setting %s to %d during gain ramp", + __func__, mixer_ctl_name_gain_right, i); + error = true; + break; + } + usleep(1000); + } + if (error) { + // an error occured during the ramp, let's still try to go back to a safe volume + if (mixer_ctl_set_value(ctl_left, 0, backup_gain)) { + ALOGE("%s: error restoring left gain to %d", __func__, backup_gain); + } + if (mixer_ctl_set_value(ctl_right, 0, backup_gain)) { + ALOGE("%s: error restoring right gain to %d", __func__, backup_gain); + } + } + return start_gain; +} + int platform_swap_lr_channels(struct audio_device *adev, bool swap_channels) { // only update if there is active pcm playback on speaker @@ -2449,7 +2510,11 @@ int platform_swap_lr_channels(struct audio_device *adev, bool swap_channels) */ if (acdb_device_table[SND_DEVICE_OUT_SPEAKER] != acdb_device_table[SND_DEVICE_OUT_SPEAKER_REVERSE]) { + const int initial_skpr_gain = ramp_speaker_gain(adev, false /*ramp_up*/, -1); select_devices(adev, usecase->id); + if (initial_skpr_gain != -EINVAL) { + ramp_speaker_gain(adev, true /*ramp_up*/, initial_skpr_gain); + } } else { const char *mixer_path; if (swap_channels) { |