audio: normalize Feature Unit volume requests

Accept the defined silence value and round ordinary volume requests to the nearest supported resolution step within the cached range. Add tests for silence, clamping, and step alignment.

Signed-off-by: HiFiPHile <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/test/unit-test/test/host/audio/test_audio_host.c b/test/unit-test/test/host/audio/test_audio_host.c
index 55b5e8ef6..aa2f70f9b 100644
--- a/test/unit-test/test/host/audio/test_audio_host.c
+++ b/test/unit-test/test/host/audio/test_audio_host.c
@@ -1536,6 +1536,22 @@ void test_audio_host_typed_mute_and_volume_controls(void) {
   TEST_ASSERT_EQUAL_HEX32(0x4567, fu_cb_user_data);
 }
 
+void test_audio_host_volume_set_accepts_silence_and_rounds_unaligned_values(void) {
+  tuh_audio_volume_range_t range;
+  mount_descriptors(playback_fu_before_terminal, sizeof(playback_fu_before_terminal));
+  TEST_ASSERT_TRUE(tuh_audio_volume_range_get(0, 0, &range));
+
+  TEST_ASSERT_TRUE(tuh_audio_volume_set(0, 0, (int16_t)(-6 * 256 + 100), feature_unit_complete, 0));
+  TEST_ASSERT_EQUAL_UINT8(1, control_xfer_count);
+  TEST_ASSERT_EQUAL_HEX8_ARRAY(((uint8_t[]){0x00, 0xFA}), control_buffer, 2);
+  complete_control_xfer(XFER_RESULT_SUCCESS);
+
+  TEST_ASSERT_TRUE(tuh_audio_volume_set(0, 0, TUH_AUDIO_VOLUME_SILENCE, feature_unit_complete, 0));
+  TEST_ASSERT_EQUAL_UINT8(2, control_xfer_count);
+  TEST_ASSERT_EQUAL_HEX8_ARRAY(((uint8_t[]){0x00, 0x80}), control_buffer, 2);
+  complete_control_xfer(XFER_RESULT_SUCCESS);
+}
+
 void test_audio_host_schedules_44100_hz_fractional_packets_with_max_packets_only(void) {
   uint8_t samples[441 * 4] = {0};
   mount_descriptors(playback_44100_max_packets_only, sizeof(playback_44100_max_packets_only));