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-rw-r--r--third_party/aom/common/ivfdec.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/third_party/aom/common/ivfdec.c b/third_party/aom/common/ivfdec.c
new file mode 100644
index 000000000..80d73b04c
--- /dev/null
+++ b/third_party/aom/common/ivfdec.c
@@ -0,0 +1,110 @@
+/*
+ * 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 "common/ivfdec.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom_ports/mem_ops.h"
+#include "aom_ports/sanitizer.h"
+
+static const char *IVF_SIGNATURE = "DKIF";
+
+static void fix_framerate(int *num, int *den) {
+ if (*den <= 0 || *den >= 1000000000 || *num <= 0 || *num >= 1000) {
+ // framerate seems to be invalid, just default to 30fps.
+ *num = 30;
+ *den = 1;
+ }
+}
+
+int file_is_ivf(struct AvxInputContext *input_ctx) {
+ char raw_hdr[32];
+ int is_ivf = 0;
+
+ if (fread(raw_hdr, 1, 32, input_ctx->file) == 32) {
+ if (memcmp(IVF_SIGNATURE, raw_hdr, 4) == 0) {
+ is_ivf = 1;
+
+ if (mem_get_le16(raw_hdr + 4) != 0) {
+ fprintf(stderr,
+ "Error: Unrecognized IVF version! This file may not"
+ " decode properly.");
+ }
+
+ input_ctx->fourcc = mem_get_le32(raw_hdr + 8);
+ input_ctx->width = mem_get_le16(raw_hdr + 12);
+ input_ctx->height = mem_get_le16(raw_hdr + 14);
+ input_ctx->framerate.numerator = mem_get_le32(raw_hdr + 16);
+ input_ctx->framerate.denominator = mem_get_le32(raw_hdr + 20);
+ fix_framerate(&input_ctx->framerate.numerator,
+ &input_ctx->framerate.denominator);
+ }
+ }
+
+ if (!is_ivf) {
+ rewind(input_ctx->file);
+ input_ctx->detect.buf_read = 0;
+ } else {
+ input_ctx->detect.position = 4;
+ }
+ return is_ivf;
+}
+
+int ivf_read_frame(FILE *infile, uint8_t **buffer, size_t *bytes_read,
+ size_t *buffer_size, aom_codec_pts_t *pts) {
+ char raw_header[IVF_FRAME_HDR_SZ] = { 0 };
+ size_t frame_size = 0;
+
+ if (fread(raw_header, IVF_FRAME_HDR_SZ, 1, infile) != 1) {
+ if (!feof(infile)) warn("Failed to read frame size");
+ } else {
+ frame_size = mem_get_le32(raw_header);
+
+ if (frame_size > 256 * 1024 * 1024) {
+ warn("Read invalid frame size (%u)", (unsigned int)frame_size);
+ frame_size = 0;
+ }
+
+ if (frame_size > *buffer_size) {
+ uint8_t *new_buffer = (uint8_t *)realloc(*buffer, 2 * frame_size);
+
+ if (new_buffer) {
+ *buffer = new_buffer;
+ *buffer_size = 2 * frame_size;
+ } else {
+ warn("Failed to allocate compressed data buffer");
+ frame_size = 0;
+ }
+ }
+
+ if (pts) {
+ *pts = mem_get_le32(&raw_header[4]);
+ *pts += ((aom_codec_pts_t)mem_get_le32(&raw_header[8]) << 32);
+ }
+ }
+
+ if (!feof(infile)) {
+ ASAN_UNPOISON_MEMORY_REGION(*buffer, *buffer_size);
+ if (fread(*buffer, 1, frame_size, infile) != frame_size) {
+ warn("Failed to read full frame");
+ return 1;
+ }
+
+ ASAN_POISON_MEMORY_REGION(*buffer + frame_size, *buffer_size - frame_size);
+ *bytes_read = frame_size;
+ return 0;
+ }
+
+ return 1;
+}