1 /* 2 * Copyright (c) 2014 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include <stdlib.h> 12 #include <string.h> 13 14 #include "./ivfdec.h" 15 #include "./video_reader.h" 16 17 #include "vpx_ports/mem_ops.h" 18 19 static const char *const kIVFSignature = "DKIF"; 20 21 struct VpxVideoReaderStruct { 22 VpxVideoInfo info; 23 FILE *file; 24 uint8_t *buffer; 25 size_t buffer_size; 26 size_t frame_size; 27 }; 28 29 VpxVideoReader *vpx_video_reader_open(const char *filename) { 30 char header[32]; 31 VpxVideoReader *reader = NULL; 32 FILE *const file = fopen(filename, "rb"); 33 if (!file) return NULL; // Can't open file 34 35 if (fread(header, 1, 32, file) != 32) return NULL; // Can't read file header 36 37 if (memcmp(kIVFSignature, header, 4) != 0) 38 return NULL; // Wrong IVF signature 39 40 if (mem_get_le16(header + 4) != 0) return NULL; // Wrong IVF version 41 42 reader = calloc(1, sizeof(*reader)); 43 if (!reader) return NULL; // Can't allocate VpxVideoReader 44 45 reader->file = file; 46 reader->info.codec_fourcc = mem_get_le32(header + 8); 47 reader->info.frame_width = mem_get_le16(header + 12); 48 reader->info.frame_height = mem_get_le16(header + 14); 49 reader->info.time_base.numerator = mem_get_le32(header + 16); 50 reader->info.time_base.denominator = mem_get_le32(header + 20); 51 52 return reader; 53 } 54 55 void vpx_video_reader_close(VpxVideoReader *reader) { 56 if (reader) { 57 fclose(reader->file); 58 free(reader->buffer); 59 free(reader); 60 } 61 } 62 63 int vpx_video_reader_read_frame(VpxVideoReader *reader) { 64 return !ivf_read_frame(reader->file, &reader->buffer, &reader->frame_size, 65 &reader->buffer_size); 66 } 67 68 const uint8_t *vpx_video_reader_get_frame(VpxVideoReader *reader, 69 size_t *size) { 70 if (size) *size = reader->frame_size; 71 72 return reader->buffer; 73 } 74 75 const VpxVideoInfo *vpx_video_reader_get_info(VpxVideoReader *reader) { 76 return &reader->info; 77 } 78
