vpx[dec|enc]: Extract IVF support from the apps.
- Move IVF reading support into ivfdec.c and ivfdec.h
- Move IVF writing support into ivfenc.c and ivfenc.h
- Removed IVF writing code from the SVC example in favor of ivfenc.
Change-Id: I70adf6240d0320fdd232d8546ed573f0f68dd793
diff --git a/ivfdec.c b/ivfdec.c
new file mode 100644
index 0000000..51f4a09
--- /dev/null
+++ b/ivfdec.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "./ivfdec.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int file_is_ivf(struct VpxInputContext *input_ctx) {
+ char raw_hdr[32];
+ int is_ivf = 0;
+
+ // TODO(tomfinegan): This can eventually go away, but for now it's required
+ // because the means by which file types are detected differ in vpxdec and
+ // vpxenc.
+ rewind(input_ctx->file);
+
+ if (fread(raw_hdr, 1, 32, input_ctx->file) == 32) {
+ if (raw_hdr[0] == 'D' && raw_hdr[1] == 'K' &&
+ raw_hdr[2] == 'I' && raw_hdr[3] == 'F') {
+ 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);
+
+ /* Some versions of vpxenc used 1/(2*fps) for the timebase, so
+ * we can guess the framerate using only the timebase in this
+ * case. Other files would require reading ahead to guess the
+ * timebase, like we do for webm.
+ */
+ if (input_ctx->framerate.numerator < 1000) {
+ /* Correct for the factor of 2 applied to the timebase in the
+ * encoder.
+ */
+ if (input_ctx->framerate.numerator & 1)
+ input_ctx->framerate.denominator <<= 1;
+ else
+ input_ctx->framerate.numerator >>= 1;
+ } else {
+ /* Don't know FPS for sure, and don't have readahead code
+ * (yet?), so just default to 30fps.
+ */
+ input_ctx->framerate.numerator = 30;
+ input_ctx->framerate.denominator = 1;
+ }
+ }
+ }
+
+ if (!is_ivf)
+ rewind(input_ctx->file);
+ else
+ input_ctx->detect.position = 4;
+
+ return is_ivf;
+}
+
+int ivf_read_frame(struct VpxInputContext *input_ctx,
+ uint8_t **buffer,
+ size_t *bytes_read,
+ size_t *buffer_size) {
+ char raw_header[IVF_FRAME_HDR_SZ] = {0};
+ size_t frame_size = 0;
+ FILE *infile = input_ctx->file;
+
+ if (input_ctx->file_type != FILE_TYPE_IVF)
+ return 0;
+
+ if (fread(raw_header, IVF_FRAME_HDR_SZ, 1, infile) != 1) {
+ if (!feof(infile))
+ warn("Failed to read frame size\n");
+ } else {
+ frame_size = mem_get_le32(raw_header);
+
+ if (frame_size > 256 * 1024 * 1024) {
+ warn("Read invalid frame size (%u)\n", (unsigned int)frame_size);
+ frame_size = 0;
+ }
+
+ if (frame_size > *buffer_size) {
+ uint8_t *new_buffer = realloc(*buffer, 2 * frame_size);
+
+ if (new_buffer) {
+ *buffer = new_buffer;
+ *buffer_size = 2 * frame_size;
+ } else {
+ warn("Failed to allocate compressed data buffer\n");
+ frame_size = 0;
+ }
+ }
+ }
+
+ if (!feof(infile)) {
+ if (fread(*buffer, 1, frame_size, infile) != frame_size) {
+ warn("Failed to read full frame\n");
+ return 1;
+ }
+
+ *bytes_read = frame_size;
+ return 0;
+ }
+
+ return 1;
+}
