Port renaming changes from AOMedia

Cherry-Picked the following commits:
0defd8f Changed "WebM" to "AOMedia" & "webm" to "aomedia"
54e6676 Replace "VPx" by "AVx"
5082a36 Change "Vpx" to "Avx"
7df44f1 Replace "Vp9" w/ "Av1"
967f722 Remove kVp9CodecId
828f30c Change "Vp8" to "AOM"
030b5ff AUTHORS regenerated
2524cae Add ref-mv experimental flag
016762b Change copyright notice to AOMedia form
81e5526 Replace vp9 w/ av1
9b94565 Add missing files
fa8ca9f Change "vp9" to "av1"
ec838b7  Convert "vp8" to "aom"
80edfa0 Change "VP9" to "AV1"
d1a11fb Change "vp8" to "aom"
7b58251 Point to WebM test data
dd1a5c8 Replace "VP8" with "AOM"
ff00fc0 Change "VPX" to "AOM"
01dee0b Change "vp10" to "av1" in source code
cebe6f0 Convert "vpx" to "aom"
17b0567 rename vp10*.mk to av1_*.mk
fe5f8a8 rename files vp10_* to av1_*

Change-Id: I6fc3d18eb11fc171e46140c836ad5339cf6c9419
diff --git a/video_writer.c b/video_writer.c
index c0c292f..5e2df64 100644
--- a/video_writer.c
+++ b/video_writer.c
@@ -12,17 +12,17 @@
 
 #include "./ivfenc.h"
 #include "./video_writer.h"
-#include "aom/vpx_encoder.h"
+#include "aom/aom_encoder.h"
 
-struct VpxVideoWriterStruct {
-  VpxVideoInfo info;
+struct AvxVideoWriterStruct {
+  AvxVideoInfo info;
   FILE *file;
   int frame_count;
 };
 
-static void write_header(FILE *file, const VpxVideoInfo *info,
+static void write_header(FILE *file, const AvxVideoInfo *info,
                          int frame_count) {
-  struct vpx_codec_enc_cfg cfg;
+  struct aom_codec_enc_cfg cfg;
   cfg.g_w = info->frame_width;
   cfg.g_h = info->frame_height;
   cfg.g_timebase.num = info->time_base.numerator;
@@ -31,11 +31,11 @@
   ivf_write_file_header(file, &cfg, info->codec_fourcc, frame_count);
 }
 
-VpxVideoWriter *vpx_video_writer_open(const char *filename,
-                                      VpxContainer container,
-                                      const VpxVideoInfo *info) {
+AvxVideoWriter *aom_video_writer_open(const char *filename,
+                                      AvxContainer container,
+                                      const AvxVideoInfo *info) {
   if (container == kContainerIVF) {
-    VpxVideoWriter *writer = NULL;
+    AvxVideoWriter *writer = NULL;
     FILE *const file = fopen(filename, "wb");
     if (!file) return NULL;
 
@@ -54,7 +54,7 @@
   return NULL;
 }
 
-void vpx_video_writer_close(VpxVideoWriter *writer) {
+void aom_video_writer_close(AvxVideoWriter *writer) {
   if (writer) {
     // Rewriting frame header with real frame count
     rewind(writer->file);
@@ -65,7 +65,7 @@
   }
 }
 
-int vpx_video_writer_write_frame(VpxVideoWriter *writer, const uint8_t *buffer,
+int aom_video_writer_write_frame(AvxVideoWriter *writer, const uint8_t *buffer,
                                  size_t size, int64_t pts) {
   ivf_write_frame_header(writer->file, pts, size);
   if (fwrite(buffer, 1, size, writer->file) != size) return 0;