Fixes for GSM decoder

Use larger buffer size, since otherwise it won't work with MediaExtractor
which batches up GSM frames.
Support reset and flush.

Change-Id: I3a87e3744c088f7a40bbc428187fc44c073c63ec

2 files changed, 28 insertions, 3 deletions

diff --git a/media/libstagefright/codecs/gsm/dec/SoftGSM.cpp b/media/libstagefright/codecs/gsm/dec/SoftGSM.cpp
index 4debc48..bd01a1a 100644
--- a/media/libstagefright/codecs/gsm/dec/SoftGSM.cpp
+++ b/media/libstagefright/codecs/gsm/dec/SoftGSM.cpp
@@ -34,6 +34,9 @@ static void InitOMXParams(T *params) {
     params->nVersion.s.nStep = 0;
 }
 
+// Microsoft WAV GSM encoding packs two GSM frames into 65 bytes.
+static const int kMSGSMFrameSize = 65;
+
 SoftGSM::SoftGSM(
         const char *name,
         const OMX_CALLBACKTYPE *callbacks,
@@ -64,7 +67,7 @@ void SoftGSM::initPorts() {
     def.eDir = OMX_DirInput;
     def.nBufferCountMin = kNumBuffers;
     def.nBufferCountActual = def.nBufferCountMin;
-    def.nBufferSize = sizeof(gsm_frame);
+    def.nBufferSize = 1024 / kMSGSMFrameSize * kMSGSMFrameSize;
     def.bEnabled = OMX_TRUE;
     def.bPopulated = OMX_FALSE;
     def.eDomain = OMX_PortDomainAudio;
@@ -207,8 +210,8 @@ void SoftGSM::onQueueFilled(OMX_U32 /* portIndex */) {
             mSignalledError = true;
         }
 
-        if(((inHeader->nFilledLen / 65) * 65) != inHeader->nFilledLen) {
-            ALOGE("input buffer not multiple of 65 (%d).", inHeader->nFilledLen);
+        if(((inHeader->nFilledLen / kMSGSMFrameSize) * kMSGSMFrameSize) != inHeader->nFilledLen) {
+            ALOGE("input buffer not multiple of %d (%d).", kMSGSMFrameSize, inHeader->nFilledLen);
             notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
             mSignalledError = true;
         }
@@ -258,6 +261,25 @@ int SoftGSM::DecodeGSM(gsm handle,
     return ret;
 }
 
+void SoftGSM::onPortFlushCompleted(OMX_U32 portIndex) {
+    if (portIndex == 0) {
+        gsm_destroy(mGsm);
+        mGsm = gsm_create();
+        int msopt = 1;
+        gsm_option(mGsm, GSM_OPT_WAV49, &msopt);
+    }
+}
+
+void SoftGSM::onReset() {
+    gsm_destroy(mGsm);
+    mGsm = gsm_create();
+    int msopt = 1;
+    gsm_option(mGsm, GSM_OPT_WAV49, &msopt);
+    mSignalledError = false;
+}
+
+
+
 
 }  // namespace android
 
diff --git a/media/libstagefright/codecs/gsm/dec/SoftGSM.h b/media/libstagefright/codecs/gsm/dec/SoftGSM.h
index 8ab6116..0303dea 100644
--- a/media/libstagefright/codecs/gsm/dec/SoftGSM.h
+++ b/media/libstagefright/codecs/gsm/dec/SoftGSM.h
@@ -43,6 +43,9 @@ protected:
 
     virtual void onQueueFilled(OMX_U32 portIndex);
 
+    virtual void onPortFlushCompleted(OMX_U32 portIndex);
+    virtual void onReset();
+
 private:
     enum {
         kNumBuffers = 4,