114 строки
3.2 KiB
C
114 строки
3.2 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "aom_ports/mem_ops.h"
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#include "./ivfdec.h"
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static const char *IVF_SIGNATURE = "DKIF";
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static void fix_framerate(int *num, int *den) {
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// Some versions of aomenc used 1/(2*fps) for the timebase, so
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// we can guess the framerate using only the timebase in this
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// case. Other files would require reading ahead to guess the
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// timebase, like we do for webm.
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if (*den > 0 && *den < 1000000000 && *num > 0 && *num < 1000) {
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// Correct for the factor of 2 applied to the timebase in the encoder.
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if (*num & 1)
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*den *= 2;
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else
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*num /= 2;
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} else {
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// Don't know FPS for sure, and don't have readahead code
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// (yet?), so just default to 30fps.
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*num = 30;
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*den = 1;
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}
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}
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int file_is_ivf(struct AvxInputContext *input_ctx) {
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char raw_hdr[32];
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int is_ivf = 0;
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if (fread(raw_hdr, 1, 32, input_ctx->file) == 32) {
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if (memcmp(IVF_SIGNATURE, raw_hdr, 4) == 0) {
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is_ivf = 1;
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if (mem_get_le16(raw_hdr + 4) != 0) {
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fprintf(stderr,
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"Error: Unrecognized IVF version! This file may not"
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" decode properly.");
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}
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input_ctx->fourcc = mem_get_le32(raw_hdr + 8);
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input_ctx->width = mem_get_le16(raw_hdr + 12);
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input_ctx->height = mem_get_le16(raw_hdr + 14);
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input_ctx->framerate.numerator = mem_get_le32(raw_hdr + 16);
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input_ctx->framerate.denominator = mem_get_le32(raw_hdr + 20);
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fix_framerate(&input_ctx->framerate.numerator,
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&input_ctx->framerate.denominator);
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}
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}
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if (!is_ivf) {
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rewind(input_ctx->file);
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input_ctx->detect.buf_read = 0;
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} else {
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input_ctx->detect.position = 4;
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}
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return is_ivf;
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}
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int ivf_read_frame(FILE *infile, uint8_t **buffer, size_t *bytes_read,
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size_t *buffer_size) {
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char raw_header[IVF_FRAME_HDR_SZ] = { 0 };
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size_t frame_size = 0;
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if (fread(raw_header, IVF_FRAME_HDR_SZ, 1, infile) != 1) {
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if (!feof(infile)) warn("Failed to read frame size\n");
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} else {
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frame_size = mem_get_le32(raw_header);
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if (frame_size > 256 * 1024 * 1024) {
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warn("Read invalid frame size (%u)\n", (unsigned int)frame_size);
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frame_size = 0;
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}
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if (frame_size > *buffer_size) {
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uint8_t *new_buffer = realloc(*buffer, 2 * frame_size);
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if (new_buffer) {
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*buffer = new_buffer;
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*buffer_size = 2 * frame_size;
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} else {
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warn("Failed to allocate compressed data buffer\n");
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frame_size = 0;
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}
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}
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}
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if (!feof(infile)) {
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if (fread(*buffer, 1, frame_size, infile) != frame_size) {
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warn("Failed to read full frame\n");
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return 1;
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}
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*bytes_read = frame_size;
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return 0;
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}
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return 1;
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}
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