video_reader.c

   1 /*
   2  * Copyright (c) 2016, Alliance for Open Media. All rights reserved
   3  *
   4  * This source code is subject to the terms of the BSD 2 Clause License and
   5  * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
   6  * was not distributed with this source code in the LICENSE file, you can
   7  * obtain it at www.aomedia.org/license/software. If the Alliance for Open
   8  * Media Patent License 1.0 was not distributed with this source code in the
   9  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  10  */
  11
  12 #include <stdlib.h>
  13 #include <string.h>
  14
  15 #include "./ivfdec.h"
  16 #include "./video_reader.h"
  17
  18 #include "aom_ports/mem_ops.h"
  19
  20 static const char *const kIVFSignature = "DKIF";
  21
  22 struct AvxVideoReaderStruct {
  23   AvxVideoInfo info;
  24   FILE *file;
  25   uint8_t *buffer;
  26   size_t buffer_size;
  27   size_t frame_size;
  28 };
  29
  30 AvxVideoReader *aom_video_reader_open(const char *filename) {
  31   char header[32];
  32   AvxVideoReader *reader = NULL;
  33   FILE *const file = fopen(filename, "rb");
  34   if (!file) return NULL;  // Can't open file
  35
  36   if (fread(header, 1, 32, file) != 32) return NULL;  // Can't read file header
  37
  38   if (memcmp(kIVFSignature, header, 4) != 0)
  39     return NULL;  // Wrong IVF signature
  40
  41   if (mem_get_le16(header + 4) != 0) return NULL;  // Wrong IVF version
  42
  43   reader = (AvxVideoReader *)calloc(1, sizeof(*reader));
  44   if (!reader) return NULL;  // Can't allocate AvxVideoReader
  45
  46   reader->file = file;
  47   reader->info.codec_fourcc = mem_get_le32(header + 8);
  48   reader->info.frame_width = mem_get_le16(header + 12);
  49   reader->info.frame_height = mem_get_le16(header + 14);
  50   reader->info.time_base.numerator = mem_get_le32(header + 16);
  51   reader->info.time_base.denominator = mem_get_le32(header + 20);
  52
  53   return reader;
  54 }
  55
  56 void aom_video_reader_close(AvxVideoReader *reader) {
  57   if (reader) {
  58     fclose(reader->file);
  59     free(reader->buffer);
  60     free(reader);
  61   }
  62 }
  63
  64 int aom_video_reader_read_frame(AvxVideoReader *reader) {
  65   return !ivf_read_frame(reader->file, &reader->buffer, &reader->frame_size,
  66                          &reader->buffer_size);
  67 }
  68
  69 const uint8_t *aom_video_reader_get_frame(AvxVideoReader *reader,
  70                                           size_t *size) {
  71   if (size) *size = reader->frame_size;
  72
  73   return reader->buffer;
  74 }
  75
  76 const AvxVideoInfo *aom_video_reader_get_info(AvxVideoReader *reader) {
  77   return &reader->info;
  78 }