| /* |
| * Copyright (c) 2013 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "./ivfdec.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| int file_is_ivf(struct VpxInputContext *input_ctx) { |
| char raw_hdr[32]; |
| int is_ivf = 0; |
| |
| // TODO(tomfinegan): This can eventually go away, but for now it's required |
| // because the means by which file types are detected differ in vpxdec and |
| // vpxenc. |
| rewind(input_ctx->file); |
| |
| if (fread(raw_hdr, 1, 32, input_ctx->file) == 32) { |
| if (raw_hdr[0] == 'D' && raw_hdr[1] == 'K' && |
| raw_hdr[2] == 'I' && raw_hdr[3] == 'F') { |
| 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); |
| |
| /* Some versions of vpxenc used 1/(2*fps) for the timebase, so |
| * we can guess the framerate using only the timebase in this |
| * case. Other files would require reading ahead to guess the |
| * timebase, like we do for webm. |
| */ |
| if (input_ctx->framerate.numerator < 1000) { |
| /* Correct for the factor of 2 applied to the timebase in the |
| * encoder. |
| */ |
| if (input_ctx->framerate.numerator & 1) |
| input_ctx->framerate.denominator <<= 1; |
| else |
| input_ctx->framerate.numerator >>= 1; |
| } else { |
| /* Don't know FPS for sure, and don't have readahead code |
| * (yet?), so just default to 30fps. |
| */ |
| input_ctx->framerate.numerator = 30; |
| input_ctx->framerate.denominator = 1; |
| } |
| } |
| } |
| |
| 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(struct VpxInputContext *input_ctx, |
| uint8_t **buffer, |
| size_t *bytes_read, |
| size_t *buffer_size) { |
| char raw_header[IVF_FRAME_HDR_SZ] = {0}; |
| size_t frame_size = 0; |
| FILE *infile = input_ctx->file; |
| |
| if (input_ctx->file_type != FILE_TYPE_IVF) |
| return 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; |
| } |