Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 78 insertions, 0 deletions

diff --git a/third_party/aom/video_reader.c b/third_party/aom/video_reader.c
new file mode 100644
index 000000000..6a96af967
--- /dev/null
+++ b/third_party/aom/video_reader.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "./ivfdec.h"
+#include "./video_reader.h"
+
+#include "aom_ports/mem_ops.h"
+
+static const char *const kIVFSignature = "DKIF";
+
+struct AvxVideoReaderStruct {
+  AvxVideoInfo info;
+  FILE *file;
+  uint8_t *buffer;
+  size_t buffer_size;
+  size_t frame_size;
+};
+
+AvxVideoReader *aom_video_reader_open(const char *filename) {
+  char header[32];
+  AvxVideoReader *reader = NULL;
+  FILE *const file = fopen(filename, "rb");
+  if (!file) return NULL;  // Can't open file
+
+  if (fread(header, 1, 32, file) != 32) return NULL;  // Can't read file header
+
+  if (memcmp(kIVFSignature, header, 4) != 0)
+    return NULL;  // Wrong IVF signature
+
+  if (mem_get_le16(header + 4) != 0) return NULL;  // Wrong IVF version
+
+  reader = (AvxVideoReader *)calloc(1, sizeof(*reader));
+  if (!reader) return NULL;  // Can't allocate AvxVideoReader
+
+  reader->file = file;
+  reader->info.codec_fourcc = mem_get_le32(header + 8);
+  reader->info.frame_width = mem_get_le16(header + 12);
+  reader->info.frame_height = mem_get_le16(header + 14);
+  reader->info.time_base.numerator = mem_get_le32(header + 16);
+  reader->info.time_base.denominator = mem_get_le32(header + 20);
+
+  return reader;
+}
+
+void aom_video_reader_close(AvxVideoReader *reader) {
+  if (reader) {
+    fclose(reader->file);
+    free(reader->buffer);
+    free(reader);
+  }
+}
+
+int aom_video_reader_read_frame(AvxVideoReader *reader) {
+  return !ivf_read_frame(reader->file, &reader->buffer, &reader->frame_size,
+                         &reader->buffer_size);
+}
+
+const uint8_t *aom_video_reader_get_frame(AvxVideoReader *reader,
+                                          size_t *size) {
+  if (size) *size = reader->frame_size;
+
+  return reader->buffer;
+}
+
+const AvxVideoInfo *aom_video_reader_get_info(AvxVideoReader *reader) {
+  return &reader->info;
+}