fix(audio): decode full-speed isochronous bInterval

Treat isochronous bInterval as a power-of-two exponent for both full and high speed, using the appropriate frame unit. Packet sizing and fractional scheduling now use the actual service interval.

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

1 files changed, 38 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 37b35dae8..b64335910 100644
--- a/test/unit-test/test/host/audio/test_audio_host.c
+++ b/test/unit-test/test/host/audio/test_audio_host.c
@@ -444,6 +444,17 @@ static const uint8_t playback_44100_max_packets_only[] = {
   TEST_UAC1_CS_DATA_EP_ATTR(AUDIO10_CS_AS_ISO_DATA_EP_ATT_MAX_PACKETS_ONLY),
 };
 
+static const uint8_t playback_11025_interval4[] = {
+  TEST_UAC1_AC_HEADER,
+  TEST_UAC1_INPUT_TERM(PLAYBACK_INPUT_TERM, AUDIO_TERM_TYPE_USB_STREAMING, 2),
+  TEST_UAC1_AS_ALT0,
+  TEST_UAC1_AS_INTERFACE(1, 1),
+  TEST_UAC1_AS_GENERAL(PLAYBACK_INPUT_TERM),
+  TEST_UAC1_FORMAT(2, 2, 16, 11025),
+  TEST_UAC1_DATA_EP(0x01, TUSB_ISO_EP_ATT_ADAPTIVE, 180, 3),
+  TEST_UAC1_CS_DATA_EP,
+};
+
 static uint8_t   fu_cb_count;
 static uintptr_t fu_cb_user_data;
 
@@ -814,6 +825,33 @@ void test_audio_host_schedules_44100_hz_fractional_packets_with_max_packets_only
   TEST_ASSERT_EQUAL_UINT16(180, edpt_xfer_bytes[9]);
 }
 
+void test_audio_host_uses_exponential_full_speed_iso_interval(void) {
+  uint8_t samples[441 * 4] = {0};
+  mount_descriptors(playback_11025_interval4, sizeof(playback_11025_interval4));
+
+  TEST_ASSERT_TRUE(tuh_audio_configure(0, 0, 0));
+  TEST_ASSERT_TRUE(tuh_audio_start(0, 0));
+  TEST_ASSERT_EQUAL_UINT32(256, tuh_audio_write(0, 0, samples, 256));
+  complete_interface_set(XFER_RESULT_SUCCESS);
+
+  while (edpt_xfer_count < 5) {
+    edpt_busy = false;
+    TEST_ASSERT_TRUE(audioh_xfer_cb(AUDIO_DEV_ADDR, 0x01, XFER_RESULT_SUCCESS,
+                                    edpt_xfer_bytes[edpt_xfer_count - 1]));
+  }
+  TEST_ASSERT_EQUAL_UINT32(185, tuh_audio_write(0, 0, samples, 185));
+  while (edpt_xfer_count < 10) {
+    edpt_busy = false;
+    TEST_ASSERT_TRUE(audioh_xfer_cb(AUDIO_DEV_ADDR, 0x01, XFER_RESULT_SUCCESS,
+                                    edpt_xfer_bytes[edpt_xfer_count - 1]));
+  }
+
+  for (uint8_t i = 0; i < 9; i++) {
+    TEST_ASSERT_EQUAL_UINT16(176, edpt_xfer_bytes[i]);
+  }
+  TEST_ASSERT_EQUAL_UINT16(180, edpt_xfer_bytes[9]);
+}
+
 void test_audio_host_sends_silence_when_playback_fifo_has_too_few_frames(void) {
   uint8_t sample[4] = {1, 2, 3, 4};
   uint8_t more_samples[43 * 4];