79 строки
2.3 KiB
C
79 строки
2.3 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 <stdlib.h>
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#include <string.h>
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#include "./ivfdec.h"
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#include "./video_reader.h"
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#include "aom_ports/mem_ops.h"
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static const char *const kIVFSignature = "DKIF";
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struct VpxVideoReaderStruct {
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VpxVideoInfo info;
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FILE *file;
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uint8_t *buffer;
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size_t buffer_size;
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size_t frame_size;
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};
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VpxVideoReader *aom_video_reader_open(const char *filename) {
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char header[32];
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VpxVideoReader *reader = NULL;
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FILE *const file = fopen(filename, "rb");
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if (!file) return NULL; // Can't open file
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if (fread(header, 1, 32, file) != 32) return NULL; // Can't read file header
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if (memcmp(kIVFSignature, header, 4) != 0)
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return NULL; // Wrong IVF signature
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if (mem_get_le16(header + 4) != 0) return NULL; // Wrong IVF version
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reader = calloc(1, sizeof(*reader));
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if (!reader) return NULL; // Can't allocate VpxVideoReader
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reader->file = file;
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reader->info.codec_fourcc = mem_get_le32(header + 8);
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reader->info.frame_width = mem_get_le16(header + 12);
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reader->info.frame_height = mem_get_le16(header + 14);
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reader->info.time_base.numerator = mem_get_le32(header + 16);
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reader->info.time_base.denominator = mem_get_le32(header + 20);
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return reader;
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}
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void aom_video_reader_close(VpxVideoReader *reader) {
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if (reader) {
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fclose(reader->file);
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free(reader->buffer);
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free(reader);
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}
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}
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int aom_video_reader_read_frame(VpxVideoReader *reader) {
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return !ivf_read_frame(reader->file, &reader->buffer, &reader->frame_size,
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&reader->buffer_size);
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}
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const uint8_t *aom_video_reader_get_frame(VpxVideoReader *reader,
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size_t *size) {
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if (size) *size = reader->frame_size;
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return reader->buffer;
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}
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const VpxVideoInfo *aom_video_reader_get_info(VpxVideoReader *reader) {
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return &reader->info;
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}
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