/* * Copyright (c) 2016, Alliance for Open Media. All rights reserved * * This source code is subject to the terms of the BSD 2 Clause License and * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License * was not distributed with this source code in the LICENSE file, you can * obtain it at www.aomedia.org/license/software. If the Alliance for Open * Media Patent License 1.0 was not distributed with this source code in the * PATENTS file, you can obtain it at www.aomedia.org/license/patent. */ #include #include #include #include "aom_ports/mem_ops.h" #include "./ivfdec.h" static const char *IVF_SIGNATURE = "DKIF"; static void fix_framerate(int *num, int *den) { if (*den <= 0 || *den >= 1000000000 || *num <= 0 || *num >= 1000) { // framerate seems to be invalid, just default to 30fps. *num = 30; *den = 1; } } int file_is_ivf(struct AvxInputContext *input_ctx) { char raw_hdr[32]; int is_ivf = 0; if (fread(raw_hdr, 1, 32, input_ctx->file) == 32) { if (memcmp(IVF_SIGNATURE, raw_hdr, 4) == 0) { is_ivf = 1; if (mem_get_le16(raw_hdr + 4) != 0) { fprintf(stderr, "Error: Unrecognized IVF version! This file may not" " decode properly."); } input_ctx->fourcc = mem_get_le32(raw_hdr + 8); input_ctx->width = mem_get_le16(raw_hdr + 12); input_ctx->height = mem_get_le16(raw_hdr + 14); input_ctx->framerate.numerator = mem_get_le32(raw_hdr + 16); input_ctx->framerate.denominator = mem_get_le32(raw_hdr + 20); fix_framerate(&input_ctx->framerate.numerator, &input_ctx->framerate.denominator); } } if (!is_ivf) { rewind(input_ctx->file); input_ctx->detect.buf_read = 0; } else { input_ctx->detect.position = 4; } return is_ivf; } int ivf_read_frame(FILE *infile, uint8_t **buffer, size_t *bytes_read, size_t *buffer_size) { char raw_header[IVF_FRAME_HDR_SZ] = { 0 }; size_t frame_size = 0; if (fread(raw_header, IVF_FRAME_HDR_SZ, 1, infile) != 1) { if (!feof(infile)) warn("Failed to read frame size\n"); } else { frame_size = mem_get_le32(raw_header); if (frame_size > 256 * 1024 * 1024) { warn("Read invalid frame size (%u)\n", (unsigned int)frame_size); frame_size = 0; } if (frame_size > *buffer_size) { uint8_t *new_buffer = realloc(*buffer, 2 * frame_size); if (new_buffer) { *buffer = new_buffer; *buffer_size = 2 * frame_size; } else { warn("Failed to allocate compressed data buffer\n"); frame_size = 0; } } } if (!feof(infile)) { if (fread(*buffer, 1, frame_size, infile) != frame_size) { warn("Failed to read full frame\n"); return 1; } *bytes_read = frame_size; return 0; } return 1; }