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
19 static const char *const kIVFSignature = "DKIF";
20
21 struct VpxVideoReaderStruct {
22 VpxVideoInfo info;
23 FILE *file;
24 uint8_t *buffer;
25 size_t buffer_size;
26 size_t frame_size;
27 };
28
vpx_video_reader_open(const char * filename)29 VpxVideoReader *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
vpx_video_reader_close(VpxVideoReader * reader)55 void vpx_video_reader_close(VpxVideoReader *reader) {
56 if (reader) {
57 fclose(reader->file);
58 free(reader->buffer);
59 free(reader);
60 }
61 }
62
vpx_video_reader_read_frame(VpxVideoReader * reader)63 int 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
vpx_video_reader_get_frame(VpxVideoReader * reader,size_t * size)68 const 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
vpx_video_reader_get_info(VpxVideoReader * reader)75 const VpxVideoInfo *vpx_video_reader_get_info(VpxVideoReader *reader) {
76 return &reader->info;
77 }
78