MPD  0.20.18
Buffer.hxx
Go to the documentation of this file.
1 /*
2  * Copyright 2003-2017 The Music Player Daemon Project
3  * http://www.musicpd.org
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
20 #ifndef MPD_FFMPEG_BUFFER_HXX
21 #define MPD_FFMPEG_BUFFER_HXX
22 
23 extern "C" {
24 #include <libavutil/mem.h>
25 
26 #if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(52, 18, 0)
27 #define HAVE_AV_FAST_MALLOC
28 #else
29 #include <libavcodec/avcodec.h>
30 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52, 25, 0)
31 #define HAVE_AV_FAST_MALLOC
32 #endif
33 #endif
34 }
35 
36 #include <stddef.h>
37 
38 /* suppress the ffmpeg compatibility macro */
39 #ifdef SampleFormat
40 #undef SampleFormat
41 #endif
42 
43 class FfmpegBuffer {
44  void *data;
45  unsigned size;
46 
47 public:
48  FfmpegBuffer():data(nullptr), size(0) {}
49 
51  av_free(data);
52  }
53 
55  void *Get(size_t min_size) {
56 #ifdef HAVE_AV_FAST_MALLOC
57  av_fast_malloc(&data, &size, min_size);
58 #else
59  void *new_data = av_fast_realloc(data, &size, min_size);
60  if (new_data == nullptr)
61  return AVERROR(ENOMEM);
62  data = new_data;
63 #endif
64  return data;
65  }
66 
67  template<typename T>
68  T *GetT(size_t n) {
69  return (T *)Get(n * sizeof(T));
70  }
71 };
72 
73 #endif
~FfmpegBuffer()
Definition: Buffer.hxx:50
#define gcc_malloc
Definition: Compiler.h:112
FfmpegBuffer()
Definition: Buffer.hxx:48
T * GetT(size_t n)
Definition: Buffer.hxx:68
gcc_malloc void * Get(size_t min_size)
Definition: Buffer.hxx:55