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.
16 static void fix_framerate(int *num, int *den) {
17 // Some versions of vpxenc used 1/(2*fps) for the timebase, so
18 // we can guess the framerate using only the timebase in this
19 // case. Other files would require reading ahead to guess the
20 // timebase, like we do for webm.
22 // Correct for the factor of 2 applied to the timebase in the encoder.
28 // Don't know FPS for sure, and don't have readahead code
29 // (yet?), so just default to 30fps.
35 int file_is_ivf(struct VpxInputContext *input_ctx) {
39 if (fread(raw_hdr, 1, 32, input_ctx->file) == 32) {
40 if (raw_hdr[0] == 'D' && raw_hdr[1] == 'K' &&
41 raw_hdr[2] == 'I' && raw_hdr[3] == 'F') {
44 if (mem_get_le16(raw_hdr + 4) != 0) {
45 fprintf(stderr, "Error: Unrecognized IVF version! This file may not"
49 input_ctx->fourcc = mem_get_le32(raw_hdr + 8);
50 input_ctx->width = mem_get_le16(raw_hdr + 12);
51 input_ctx->height = mem_get_le16(raw_hdr + 14);
52 input_ctx->framerate.numerator = mem_get_le32(raw_hdr + 16);
53 input_ctx->framerate.denominator = mem_get_le32(raw_hdr + 20);
54 fix_framerate(&input_ctx->framerate.numerator,
55 &input_ctx->framerate.denominator);
60 rewind(input_ctx->file);
61 input_ctx->detect.buf_read = 0;
63 input_ctx->detect.position = 4;
68 int ivf_read_frame(FILE *infile, uint8_t **buffer,
69 size_t *bytes_read, size_t *buffer_size) {
70 char raw_header[IVF_FRAME_HDR_SZ] = {0};
71 size_t frame_size = 0;
73 if (fread(raw_header, IVF_FRAME_HDR_SZ, 1, infile) != 1) {
75 warn("Failed to read frame size\n");
77 frame_size = mem_get_le32(raw_header);
79 if (frame_size > 256 * 1024 * 1024) {
80 warn("Read invalid frame size (%u)\n", (unsigned int)frame_size);
84 if (frame_size > *buffer_size) {
85 uint8_t *new_buffer = realloc(*buffer, 2 * frame_size);
89 *buffer_size = 2 * frame_size;
91 warn("Failed to allocate compressed data buffer\n");
98 if (fread(*buffer, 1, frame_size, infile) != frame_size) {
99 warn("Failed to read full frame\n");
103 *bytes_read = frame_size;