2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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.
17 static const char *IVF_SIGNATURE = "DKIF";
19 static void fix_framerate(int *num, int *den) {
20 // Some versions of vpxenc used 1/(2*fps) for the timebase, so
21 // we can guess the framerate using only the timebase in this
22 // case. Other files would require reading ahead to guess the
23 // timebase, like we do for webm.
25 // Correct for the factor of 2 applied to the timebase in the encoder.
31 // Don't know FPS for sure, and don't have readahead code
32 // (yet?), so just default to 30fps.
38 int file_is_ivf(struct VpxInputContext *input_ctx) {
42 if (fread(raw_hdr, 1, 32, input_ctx->file) == 32) {
43 if (memcmp(IVF_SIGNATURE, raw_hdr, 4) == 0) {
46 if (mem_get_le16(raw_hdr + 4) != 0) {
47 fprintf(stderr, "Error: Unrecognized IVF version! This file may not"
51 input_ctx->fourcc = mem_get_le32(raw_hdr + 8);
52 input_ctx->width = mem_get_le16(raw_hdr + 12);
53 input_ctx->height = mem_get_le16(raw_hdr + 14);
54 input_ctx->framerate.numerator = mem_get_le32(raw_hdr + 16);
55 input_ctx->framerate.denominator = mem_get_le32(raw_hdr + 20);
56 fix_framerate(&input_ctx->framerate.numerator,
57 &input_ctx->framerate.denominator);
62 rewind(input_ctx->file);
63 input_ctx->detect.buf_read = 0;
65 input_ctx->detect.position = 4;
70 int ivf_read_frame(FILE *infile, uint8_t **buffer,
71 size_t *bytes_read, size_t *buffer_size) {
72 char raw_header[IVF_FRAME_HDR_SZ] = {0};
73 size_t frame_size = 0;
75 if (fread(raw_header, IVF_FRAME_HDR_SZ, 1, infile) != 1) {
77 warn("Failed to read frame size\n");
79 frame_size = mem_get_le32(raw_header);
81 if (frame_size > 256 * 1024 * 1024) {
82 warn("Read invalid frame size (%u)\n", (unsigned int)frame_size);
86 if (frame_size > *buffer_size) {
87 uint8_t *new_buffer = realloc(*buffer, 2 * frame_size);
91 *buffer_size = 2 * frame_size;
93 warn("Failed to allocate compressed data buffer\n");
100 if (fread(*buffer, 1, frame_size, infile) != frame_size) {
101 warn("Failed to read full frame\n");
105 *bytes_read = frame_size;
114 unsigned char *buffer;
122 vpx_video_t *vpx_video_open_file(FILE *file) {
126 if (fread(raw_hdr, 1, 32, file) != 32)
127 return NULL; // Can't read file header;
129 if (memcmp(IVF_SIGNATURE, raw_hdr, 4) != 0)
130 return NULL; // Wrong IVF signature
132 if (mem_get_le16(raw_hdr + 4) != 0)
133 return NULL; // Wrong IVF version
135 video = (vpx_video_t *)malloc(sizeof(*video));
137 video->buffer = NULL;
138 video->buffer_size = 0;
139 video->frame_size = 0;
140 video->fourcc = mem_get_le32(raw_hdr + 8);
141 video->width = mem_get_le16(raw_hdr + 12);
142 video->height = mem_get_le16(raw_hdr + 14);
146 void vpx_video_close(vpx_video_t *video) {
153 int vpx_video_get_width(vpx_video_t *video) {
157 int vpx_video_get_height(vpx_video_t *video) {
158 return video->height;
161 unsigned int vpx_video_get_fourcc(vpx_video_t *video) {
162 return video->fourcc;
165 int vpx_video_read_frame(vpx_video_t *video) {
166 return !ivf_read_frame(video->file, &video->buffer, &video->frame_size,
167 &video->buffer_size);
170 const unsigned char *vpx_video_get_frame(vpx_video_t *video, size_t *size) {
172 *size = video->frame_size;
174 return video->buffer;