Adding video reader/writer APIs.

Right now only IVF format is supported which is enough for example code.
Other formats like y4m, webm, raw yuv will be supported later.

Change-Id: I34c6f20731c1851947587ca5c589d7856b675164

1 files changed, 80 insertions, 0 deletions

diff --git a/video_writer.c b/video_writer.c
new file mode 100644
index 000000000..3695236bf
--- /dev/null
+++ b/video_writer.c
@@ -0,0 +1,80 @@
+/*
+ *  Copyright (c) 2014 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 <stdlib.h>
+
+#include "./ivfenc.h"
+#include "./video_writer.h"
+#include "vpx/vpx_encoder.h"
+
+struct VpxVideoWriterStruct {
+  VpxVideoInfo info;
+  FILE *file;
+  int frame_count;
+};
+
+static void write_header(FILE *file, const VpxVideoInfo *info,
+                         int frame_count) {
+  struct vpx_codec_enc_cfg cfg;
+  cfg.g_w = info->frame_width;
+  cfg.g_h = info->frame_height;
+  cfg.g_timebase.num = info->time_base.numerator;
+  cfg.g_timebase.den = info->time_base.denominator;
+
+  ivf_write_file_header(file, &cfg, info->codec_fourcc, frame_count);
+}
+
+VpxVideoWriter *vpx_video_writer_open(const char *filename,
+                                      VpxContainer container,
+                                      const VpxVideoInfo *info) {
+  if (container == kContainerIVF) {
+    VpxVideoWriter *writer = NULL;
+    FILE *const file = fopen(filename, "wb");
+    if (!file)
+      return NULL;
+
+    writer = malloc(sizeof(*writer));
+    if (!writer)
+      return NULL;
+
+    writer->frame_count = 0;
+    writer->info = *info;
+    writer->file = file;
+
+    write_header(writer->file, info, 0);
+
+    return writer;
+  }
+
+  return NULL;
+}
+
+void vpx_video_writer_close(VpxVideoWriter *writer) {
+  if (writer) {
+    // Rewriting frame header with real frame count
+    rewind(writer->file);
+    write_header(writer->file, &writer->info, writer->frame_count);
+
+    fclose(writer->file);
+    free(writer);
+  }
+}
+
+int vpx_video_writer_write_frame(VpxVideoWriter *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;
+
+  ++writer->frame_count;
+
+  return 1;
+}