ahal: fix invalid pcm offload position when SSR happens

When SSR happens, postion queried from DSP could be invalid,
instead, frames written could be returned as current position.
Also cache the current position as compensation, when sound
card is online, return current DSP position plus the compensation.

Change-Id: Iff1b1ae9e5217f384d6ae0460b3acee5f8881aa5

1 files changed, 13 insertions, 0 deletions

diff --git a/hal/AudioStream.cpp b/hal/AudioStream.cpp
index bcfb3a78..d320f155 100644
--- a/hal/AudioStream.cpp
+++ b/hal/AudioStream.cpp
@@ -2806,6 +2806,19 @@ int StreamOutPrimary::GetFrames(uint64_t *frames)
         *frames = 0;
         return 0;
     }
+    /*
+     * when ssr happens, dsp position for pcm offload could be 0,
+     * so return written frames instead
+     */
+    if ((PAL_STREAM_PCM_OFFLOAD == streamAttributes_.type) &&
+        (CARD_STATUS_OFFLINE == AudioDevice::sndCardState)) {
+        struct timespec ts;
+        *frames = GetFramesWritten(&ts);
+        mCachedPosition = *frames;
+        AHAL_DBG("card is offline, return written frames %lld", (long long) *frames);
+        goto exit;
+    }
+
     ret = pal_get_timestamp(pal_stream_handle_, &tstamp);
     if (ret != 0) {
        AHAL_ERR("pal_get_timestamp failed %d", ret);