New _CreateBinaryDelayEstimator() and removed _history_size()

Changed create function to match malloc() in functionality.
Removed unused function.

Tested with audioproc_unittest

BUG=
TEST=

Review URL: https://webrtc-codereview.appspot.com/491010

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2048 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/audio_processing/utility/delay_estimator.c

@@ -83,35 +83,19 @@ void WebRtc_FreeBinaryDelayEstimator(BinaryDelayEstimator* handle) {
   free(handle);
 }
 
-int WebRtc_CreateBinaryDelayEstimator(BinaryDelayEstimator** handle,
-                                      int max_delay,
+BinaryDelayEstimator* WebRtc_CreateBinaryDelayEstimator(int max_delay,
                                                         int lookahead) {
   BinaryDelayEstimator* self = NULL;
-  int history_size = max_delay + lookahead;
-  int return_value = 0;
-
-  if (handle == NULL) {
-    return -1;
-  }
-  *handle = NULL;
-
-  if (max_delay < 0) {
-    return -1;
-  }
-  if (lookahead < 0) {
-    return -1;
-  }
-  if (history_size < 2) {
-    // Must be this large for buffer shifting.
-    return -1;
-  }
+  int history_size = max_delay + lookahead;  // Must be > 1 for buffer shifting.
 
+  if ((max_delay >= 0) && (lookahead >= 0) && (history_size > 1)) {
+    // Sanity conditions fulfilled.
     self = malloc(sizeof(BinaryDelayEstimator));
-  *handle = self;
-  if (self == NULL) {
-    return -1;
   }
 
+  if (self != NULL) {
+    int malloc_fail = 0;
+
     self->mean_bit_counts = NULL;
     self->bit_counts = NULL;
     self->binary_far_history = NULL;
@@ -123,33 +107,28 @@ int WebRtc_CreateBinaryDelayEstimator(BinaryDelayEstimator** handle,
 
     // Allocate memory for spectrum buffers.
     self->mean_bit_counts = malloc(history_size * sizeof(int32_t));
-  if (self->mean_bit_counts == NULL) {
-    return_value = -1;
-  }
+    malloc_fail |= (self->mean_bit_counts == NULL);
+
     self->bit_counts = malloc(history_size * sizeof(int32_t));
-  if (self->bit_counts == NULL) {
-    return_value = -1;
-  }
+    malloc_fail |= (self->bit_counts == NULL);
+
     // Allocate memory for history buffers.
     self->binary_far_history = malloc(history_size * sizeof(uint32_t));
-  if (self->binary_far_history == NULL) {
-    return_value = -1;
-  }
-  self->binary_near_history = malloc(self->near_history_size *
-      sizeof(uint32_t));
-  if (self->binary_near_history == NULL) {
-    return_value = -1;
-  }
+    malloc_fail |= (self->binary_far_history == NULL);
+
+    self->binary_near_history = malloc((lookahead + 1) * sizeof(uint32_t));
+    malloc_fail |= (self->binary_near_history == NULL);
+
     self->far_bit_counts = malloc(history_size * sizeof(int));
-  if (self->far_bit_counts == NULL) {
-    return_value = -1;
+    malloc_fail |= (self->far_bit_counts == NULL);
+
+    if (malloc_fail) {
+      WebRtc_FreeBinaryDelayEstimator(self);
+      self = NULL;
+    }
   }
 
-  if (return_value == -1) {
-    WebRtc_FreeBinaryDelayEstimator(self);
-    *handle = NULL;
-  }
-  return return_value;
+  return self;
 }
 
 int WebRtc_InitBinaryDelayEstimator(BinaryDelayEstimator* handle) {
@@ -292,11 +271,6 @@ int WebRtc_binary_last_delay(BinaryDelayEstimator* handle) {
   return handle->last_delay;
 }
 
-int WebRtc_history_size(BinaryDelayEstimator* handle) {
-  assert(handle != NULL);
-  return handle->history_size;
-}
-
 void WebRtc_MeanEstimatorFix(int32_t new_value,
                              int factor,
                              int32_t* mean_value) {

src/modules/audio_processing/utility/delay_estimator.h

@@ -45,13 +45,14 @@ typedef struct {
 
 // Releases the memory allocated by WebRtc_CreateBinaryDelayEstimator(...).
 // Input:
-//    - handle            : Pointer to the delay estimation instance.
+//    - handle            : Pointer to the binary delay estimation instance
+//                          which is the return value of
+//                          WebRtc_CreateBinaryDelayEstimator().
 //
 void WebRtc_FreeBinaryDelayEstimator(BinaryDelayEstimator* handle);
 
 // Refer to WebRtc_CreateDelayEstimator() in delay_estimator_wrapper.h.
-int WebRtc_CreateBinaryDelayEstimator(BinaryDelayEstimator** handle,
-                                      int max_delay,
+BinaryDelayEstimator* WebRtc_CreateBinaryDelayEstimator(int max_delay,
                                                         int lookahead);
 
 // Initializes the delay estimation instance created with
@@ -97,18 +98,6 @@ int WebRtc_ProcessBinarySpectrum(BinaryDelayEstimator* handle,
 //
 int WebRtc_binary_last_delay(BinaryDelayEstimator* handle);
 
-// Returns the history size used in the far-end buffers to calculate the delay
-// over.
-//
-// Input:
-//    - handle                : Pointer to the delay estimation instance.
-//
-// Return value:
-//    - history_size          :  > 0  - Far-end history size.
-//                              -1    - Error.
-//
-int WebRtc_history_size(BinaryDelayEstimator* handle);
-
 // Updates the |mean_value| recursively with a step size of 2^-|factor|. This
 // function is used internally in the Binary Delay Estimator as well as the
 // Fixed point wrapper.

src/modules/audio_processing/utility/delay_estimator_wrapper.c

@@ -188,12 +188,11 @@ int WebRtc_CreateDelayEstimator(void** handle,
   self->mean_far_spectrum = NULL;
   self->mean_near_spectrum = NULL;
 
-  // Create binary delay estimator.
-  if (WebRtc_CreateBinaryDelayEstimator(&self->binary_handle,
-                                        max_delay,
-                                        lookahead) != 0) {
+  self->binary_handle = WebRtc_CreateBinaryDelayEstimator(max_delay, lookahead);
+  if (self->binary_handle == NULL) {
     return_value = -1;
   }
+
   // Allocate memory for spectrum buffers.
   self->mean_far_spectrum = malloc(spectrum_size * sizeof(SpectrumType));
   if (self->mean_far_spectrum == NULL) {