Return correct input buffer size.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

1 files changed, 25 insertions, 1 deletions

diff --git a/audio_hw.c b/audio_hw.c
index 0292216..cfe4058 100644
--- a/audio_hw.c
+++ b/audio_hw.c
@@ -310,9 +310,33 @@ static char *audio_hw_get_parameters(const struct audio_hw_device *dev,
 static size_t audio_hw_get_input_buffer_size(const struct audio_hw_device *dev,
 	uint32_t sample_rate, int format, int channel_count)
 {
+	struct tinyalsa_audio_device *device;
+	struct tinyalsa_mixer_io_props *mixer_props;
+	size_t size;
+
 	LOGD("%s(%p, %d, %d, %d)", __func__, dev, sample_rate, format, channel_count);
 
-	return 320;
+	if(dev == NULL)
+		return -1;
+
+	device = (struct tinyalsa_audio_device *) dev;
+
+	if(device->mixer == NULL)
+		return -1;
+
+	mixer_props = tinyalsa_mixer_get_input_props(device->mixer);
+	if(mixer_props == NULL)
+		return -1;
+
+	// Default value
+	if(mixer_props->rate == 0)
+		mixer_props->rate = 44100;
+
+	size = (mixer_props->period_size * sample_rate) / mixer_props->rate;
+	size = ((size + 15) / 16) * 16;
+	size = size * channel_count * audio_bytes_per_sample(format);
+
+	return size;
 }
 
 static int audio_hw_dump(const audio_hw_device_t *device, int fd)