video_writer.c

   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
  13 #include "./ivfenc.h"
  14 #include "./video_writer.h"
  15 #include "vpx/vpx_encoder.h"
  16
  17 struct VpxVideoWriterStruct {
  18   VpxVideoInfo info;
  19   FILE *file;
  20   int frame_count;
  21 };
  22
  23 static void write_header(FILE *file, const VpxVideoInfo *info,
  24                          int frame_count) {
  25   struct vpx_codec_enc_cfg cfg;
  26   cfg.g_w = info->frame_width;
  27   cfg.g_h = info->frame_height;
  28   cfg.g_timebase.num = info->time_base.numerator;
  29   cfg.g_timebase.den = info->time_base.denominator;
  30
  31   ivf_write_file_header(file, &cfg, info->codec_fourcc, frame_count);
  32 }
  33
  34 VpxVideoWriter *vpx_video_writer_open(const char *filename,
  35                                       VpxContainer container,
  36                                       const VpxVideoInfo *info) {
  37   if (container == kContainerIVF) {
  38     VpxVideoWriter *writer = NULL;
  39     FILE *const file = fopen(filename, "wb");
  40     if (!file)
  41       return NULL;
  42
  43     writer = malloc(sizeof(*writer));
  44     if (!writer)
  45       return NULL;
  46
  47     writer->frame_count = 0;
  48     writer->info = *info;
  49     writer->file = file;
  50
  51     write_header(writer->file, info, 0);
  52
  53     return writer;
  54   }
  55
  56   return NULL;
  57 }
  58
  59 void vpx_video_writer_close(VpxVideoWriter *writer) {
  60   if (writer) {
  61     // Rewriting frame header with real frame count
  62     rewind(writer->file);
  63     write_header(writer->file, &writer->info, writer->frame_count);
  64
  65     fclose(writer->file);
  66     free(writer);
  67   }
  68 }
  69
  70 int vpx_video_writer_write_frame(VpxVideoWriter *writer,
  71                                  const uint8_t *buffer, size_t size,
  72                                  int64_t pts) {
  73   ivf_write_frame_header(writer->file, pts, size);
  74   if (fwrite(buffer, 1, size, writer->file) != size)
  75     return 0;
  76
  77   ++writer->frame_count;
  78
  79   return 1;
  80 }