Remove unused buffer_size

Manually cherry-picked from libvpx/nextgenv2:
fa99c376

Change-Id: Ia614aaa784c405a3d0f815846a584dd358008b18

aomdec.c

@@ -218,8 +218,7 @@ static int read_frame(struct AvxDecInputContext *input, uint8_t **buf,
   switch (input->aom_input_ctx->file_type) {
 #if CONFIG_WEBM_IO
     case FILE_TYPE_WEBM:
-      return webm_read_frame(input->webm_ctx, buf, bytes_in_buffer,
-                             buffer_size);
+      return webm_read_frame(input->webm_ctx, buf, bytes_in_buffer);
 #endif
     case FILE_TYPE_RAW:
       return raw_read_frame(input->aom_input_ctx->file, buf, bytes_in_buffer,

test/webm_video_source.h

@@ -56,7 +56,7 @@ class WebMVideoSource : public CompressedVideoSource {
 
   void FillFrame() {
     ASSERT_TRUE(aom_ctx_->file != NULL);
-    const int status = webm_read_frame(webm_ctx_, &buf_, &buf_sz_, &buf_sz_);
+    const int status = webm_read_frame(webm_ctx_, &buf_, &buf_sz_);
     ASSERT_GE(status, 0) << "webm_read_frame failed";
     if (status == 1) {
       end_of_file_ = true;
@@ -66,7 +66,7 @@ class WebMVideoSource : public CompressedVideoSource {
   void SeekToNextKeyFrame() {
     ASSERT_TRUE(aom_ctx_->file != NULL);
     do {
-      const int status = webm_read_frame(webm_ctx_, &buf_, &buf_sz_, &buf_sz_);
+      const int status = webm_read_frame(webm_ctx_, &buf_, &buf_sz_);
       ASSERT_GE(status, 0) << "webm_read_frame failed";
       ++frame_;
       if (status == 1) {

webmdec.cc

@@ -118,7 +118,7 @@ int file_is_webm(struct WebmInputContext *webm_ctx,
 }
 
 int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
-                    size_t *bytes_in_buffer, size_t *buffer_size) {
+                    size_t *buffer_size) {
   // This check is needed for frame parallel decoding, in which case this
   // function could be called even after it has reached end of input stream.
   if (webm_ctx->reached_eos) {
@@ -142,7 +142,7 @@ int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
     } else if (block_entry_eos || block_entry->EOS()) {
       cluster = segment->GetNext(cluster);
       if (cluster == NULL || cluster->EOS()) {
-        *bytes_in_buffer = 0;
+        *buffer_size = 0;
         webm_ctx->reached_eos = 1;
         return 1;
       }
@@ -159,7 +159,7 @@ int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
       }
       get_new_block = true;
     }
-    if (status) {
+    if (status || block_entry == NULL) {
       return -1;
     }
     if (get_new_block) {
@@ -182,10 +182,9 @@ int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
     if (*buffer == NULL) {
       return -1;
     }
-    *buffer_size = frame.len;
     webm_ctx->buffer = *buffer;
   }
-  *bytes_in_buffer = frame.len;
+  *buffer_size = frame.len;
   webm_ctx->timestamp_ns = block->GetTime(cluster);
   webm_ctx->is_key_frame = block->IsKey();
 
@@ -198,10 +197,9 @@ int webm_guess_framerate(struct WebmInputContext *webm_ctx,
                          struct AvxInputContext *aom_ctx) {
   uint32_t i = 0;
   uint8_t *buffer = NULL;
-  size_t bytes_in_buffer = 0;
   size_t buffer_size = 0;
   while (webm_ctx->timestamp_ns < 1000000000 && i < 50) {
-    if (webm_read_frame(webm_ctx, &buffer, &bytes_in_buffer, &buffer_size)) {
+    if (webm_read_frame(webm_ctx, &buffer, &buffer_size)) {
       break;
     }
     ++i;

webmdec.h

@@ -43,21 +43,18 @@ int file_is_webm(struct WebmInputContext *webm_ctx,
 
 // Reads a WebM Video Frame. Memory for the buffer is created, owned and managed
 // by this function. For the first call, |buffer| should be NULL and
-// |*bytes_in_buffer| should be 0. Once all the frames are read and used,
+// |*buffer_size| should be 0. Once all the frames are read and used,
 // webm_free() should be called, otherwise there will be a leak.
 // Parameters:
 //      webm_ctx - WebmInputContext object
 //      buffer - pointer where the frame data will be filled.
-//      bytes_in_buffer - pointer to buffer size.
-//      buffer_size - unused TODO(vigneshv): remove this
+//      buffer_size - pointer to buffer size.
 // Return values:
 //      0 - Success
 //      1 - End of Stream
 //     -1 - Error
-// TODO(vigneshv): Make the return values consistent across all functions in
-// this file.
 int webm_read_frame(struct WebmInputContext *webm_ctx, uint8_t **buffer,
-                    size_t *bytes_in_buffer, size_t *buffer_size);
+                    size_t *buffer_size);
 
 // Guesses the frame rate of the input file based on the container timestamps.
 int webm_guess_framerate(struct WebmInputContext *webm_ctx,