1/*
2 *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include <stdlib.h>
12#include <string.h>
13
14#include "./ivfdec.h"
15#include "./video_reader.h"
16
17#include "vpx_ports/mem_ops.h"
18
19static const char *const kIVFSignature = "DKIF";
20
21struct VpxVideoReaderStruct {
22  VpxVideoInfo info;
23  FILE *file;
24  uint8_t *buffer;
25  size_t buffer_size;
26  size_t frame_size;
27};
28
29VpxVideoReader *vpx_video_reader_open(const char *filename) {
30  char header[32];
31  VpxVideoReader *reader = NULL;
32  FILE *const file = fopen(filename, "rb");
33  if (!file) return NULL;  // Can't open file
34
35  if (fread(header, 1, 32, file) != 32) return NULL;  // Can't read file header
36
37  if (memcmp(kIVFSignature, header, 4) != 0)
38    return NULL;  // Wrong IVF signature
39
40  if (mem_get_le16(header + 4) != 0) return NULL;  // Wrong IVF version
41
42  reader = calloc(1, sizeof(*reader));
43  if (!reader) return NULL;  // Can't allocate VpxVideoReader
44
45  reader->file = file;
46  reader->info.codec_fourcc = mem_get_le32(header + 8);
47  reader->info.frame_width = mem_get_le16(header + 12);
48  reader->info.frame_height = mem_get_le16(header + 14);
49  reader->info.time_base.numerator = mem_get_le32(header + 16);
50  reader->info.time_base.denominator = mem_get_le32(header + 20);
51
52  return reader;
53}
54
55void vpx_video_reader_close(VpxVideoReader *reader) {
56  if (reader) {
57    fclose(reader->file);
58    free(reader->buffer);
59    free(reader);
60  }
61}
62
63int vpx_video_reader_read_frame(VpxVideoReader *reader) {
64  return !ivf_read_frame(reader->file, &reader->buffer, &reader->frame_size,
65                         &reader->buffer_size);
66}
67
68const uint8_t *vpx_video_reader_get_frame(VpxVideoReader *reader,
69                                          size_t *size) {
70  if (size) *size = reader->frame_size;
71
72  return reader->buffer;
73}
74
75const VpxVideoInfo *vpx_video_reader_get_info(VpxVideoReader *reader) {
76  return &reader->info;
77}
78