hikey960: Add hifi dsp audio example of increasing PCM Gain
In this example output stream buffer is send to DSP through
HIFI_MISC_IOCTL_PCM_GAIN Ioctl for increasing gain.
Bug: 64395692
Test: Manual
Change-Id: I1e931d985335d6d236c0edf84978170f651feffd
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index 33c569e..87fc4c6 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -40,6 +40,8 @@
#include <hardware/audio_alsaops.h>
#include <audio_effects/effect_aec.h>
+#include <sys/ioctl.h>
+#include <linux/audio_hifi.h>
#define CARD_OUT 0
#define PORT_CODEC 0
@@ -69,6 +71,7 @@
struct alsa_stream_in *active_input;
struct alsa_stream_out *active_output;
bool mic_mute;
+ int hifi_dsp_fd;
};
struct alsa_stream_out {
@@ -249,6 +252,7 @@
size_t frame_size = audio_stream_out_frame_size(stream);
size_t out_frames = bytes / frame_size;
int kernel_frames;
+ struct misc_io_pcm_buf_param pcmbuf;
/* acquiring hw device mutex systematically is useful if a low priority thread is waiting
* on the output stream mutex - e.g. executing select_mode() while holding the hw device
@@ -267,6 +271,15 @@
pthread_mutex_unlock(&adev->lock);
+ if (adev->hifi_dsp_fd >= 0) {
+ pcmbuf.buf = (uint64_t)buffer;
+ pcmbuf.buf_size = bytes;
+ ret = ioctl(adev->hifi_dsp_fd, HIFI_MISC_IOCTL_PCM_GAIN, &pcmbuf);
+ if (ret) {
+ ALOGV("hifi_dsp: Error buffer processing: %d", errno);
+ }
+ }
+
ret = pcm_mmap_write(out->pcm, buffer, out_frames * frame_size);
if (ret == 0) {
out->written += out_frames;
@@ -630,7 +643,11 @@
static int adev_close(hw_device_t *device)
{
+ struct alsa_audio_device *adev = (struct alsa_audio_device *)device;
+
ALOGV("adev_close");
+ if (adev->hifi_dsp_fd >= 0)
+ close(adev->hifi_dsp_fd);
free(device);
return 0;
}
@@ -676,6 +693,12 @@
*device = &adev->hw_device.common;
+ adev->hifi_dsp_fd = open(HIFI_DSP_MISC_DRIVER, O_WRONLY, 0);
+ if (adev->hifi_dsp_fd < 0) {
+ ALOGW("hifi_dsp: Error opening device %d", errno);
+ } else {
+ ALOGI("hifi_dsp: Open device");
+ }
return 0;
}