1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef MEDIA_FFMPEG_FFMPEG_COMMON_H_
6 #define MEDIA_FFMPEG_FFMPEG_COMMON_H_
7
8 // Used for FFmpeg error codes.
9 #include <cerrno>
10
11 #include "base/compiler_specific.h"
12 #include "base/time/time.h"
13 #include "media/base/audio_decoder_config.h"
14 #include "media/base/channel_layout.h"
15 #include "media/base/media_export.h"
16 #include "media/base/video_decoder_config.h"
17 #include "media/base/video_frame.h"
18 #include "media/ffmpeg/ffmpeg_deleters.h"
19
20 // Include FFmpeg header files.
21 extern "C" {
22 // Disable deprecated features which result in spammy compile warnings. This
23 // list of defines must mirror those in the 'defines' section of the ffmpeg.gyp
24 // file or the headers below will generate different structures.
25 #define FF_API_PIX_FMT_DESC 0
26 #define FF_API_OLD_DECODE_AUDIO 0
27 #define FF_API_DESTRUCT_PACKET 0
28 #define FF_API_GET_BUFFER 0
29
30 // Temporarily disable possible loss of data warning.
31 // TODO(scherkus): fix and upstream the compiler warnings.
32 MSVC_PUSH_DISABLE_WARNING(4244);
33 #include <libavcodec/avcodec.h>
34 #include <libavformat/avformat.h>
35 #include <libavformat/avio.h>
36 #include <libavutil/avutil.h>
37 #include <libavutil/imgutils.h>
38 #include <libavutil/log.h>
39 #include <libavutil/mathematics.h>
40 #include <libavutil/opt.h>
41 MSVC_POP_WARNING();
42 } // extern "C"
43
44 namespace media {
45
46 class AudioDecoderConfig;
47 class VideoDecoderConfig;
48
49 // The following implement the deleters declared in ffmpeg_deleters.h (which
50 // contains the declarations needed for use with |scoped_ptr| without #include
51 // "pollution").
52
operator()53 inline void ScopedPtrAVFree::operator()(void* x) const {
54 av_free(x);
55 }
56
operator()57 inline void ScopedPtrAVFreePacket::operator()(void* x) const {
58 AVPacket* packet = static_cast<AVPacket*>(x);
59 av_free_packet(packet);
60 delete packet;
61 }
62
operator()63 inline void ScopedPtrAVFreeContext::operator()(void* x) const {
64 AVCodecContext* codec_context = static_cast<AVCodecContext*>(x);
65 avcodec_free_context(&codec_context);
66 }
67
operator()68 inline void ScopedPtrAVFreeFrame::operator()(void* x) const {
69 AVFrame* frame = static_cast<AVFrame*>(x);
70 av_frame_free(&frame);
71 }
72
73 // Converts an int64 timestamp in |time_base| units to a base::TimeDelta.
74 // For example if |timestamp| equals 11025 and |time_base| equals {1, 44100}
75 // then the return value will be a base::TimeDelta for 0.25 seconds since that
76 // is how much time 11025/44100ths of a second represents.
77 MEDIA_EXPORT base::TimeDelta ConvertFromTimeBase(const AVRational& time_base,
78 int64 timestamp);
79
80 // Converts a base::TimeDelta into an int64 timestamp in |time_base| units.
81 // For example if |timestamp| is 0.5 seconds and |time_base| is {1, 44100}, then
82 // the return value will be 22050 since that is how many 1/44100ths of a second
83 // represent 0.5 seconds.
84 MEDIA_EXPORT int64 ConvertToTimeBase(const AVRational& time_base,
85 const base::TimeDelta& timestamp);
86
87 void AVStreamToAudioDecoderConfig(
88 const AVStream* stream,
89 AudioDecoderConfig* config,
90 bool record_stats);
91 void AudioDecoderConfigToAVCodecContext(
92 const AudioDecoderConfig& config,
93 AVCodecContext* codec_context);
94
95 void AVStreamToVideoDecoderConfig(
96 const AVStream* stream,
97 VideoDecoderConfig* config,
98 bool record_stats);
99 void VideoDecoderConfigToAVCodecContext(
100 const VideoDecoderConfig& config,
101 AVCodecContext* codec_context);
102
103 MEDIA_EXPORT void AVCodecContextToAudioDecoderConfig(
104 const AVCodecContext* codec_context,
105 bool is_encrypted,
106 AudioDecoderConfig* config,
107 bool record_stats);
108
109 // Converts FFmpeg's channel layout to chrome's ChannelLayout. |channels| can
110 // be used when FFmpeg's channel layout is not informative in order to make a
111 // good guess about the plausible channel layout based on number of channels.
112 MEDIA_EXPORT ChannelLayout ChannelLayoutToChromeChannelLayout(int64_t layout,
113 int channels);
114
115 // Converts FFmpeg's audio sample format to Chrome's SampleFormat.
116 MEDIA_EXPORT SampleFormat
117 AVSampleFormatToSampleFormat(AVSampleFormat sample_format);
118
119 // Converts FFmpeg's pixel formats to its corresponding supported video format.
120 MEDIA_EXPORT VideoFrame::Format PixelFormatToVideoFormat(
121 PixelFormat pixel_format);
122
123 // Converts video formats to its corresponding FFmpeg's pixel formats.
124 PixelFormat VideoFormatToPixelFormat(VideoFrame::Format video_format);
125
126 // Convert FFmpeg UTC representation (YYYY-MM-DD HH:MM:SS) to base::Time.
127 // Returns true and sets |*out| if |date_utc| contains a valid
128 // date string. Otherwise returns fals and timeline_offset is unmodified.
129 MEDIA_EXPORT bool FFmpegUTCDateToTime(const char* date_utc, base::Time* out);
130
131 } // namespace media
132
133 #endif // MEDIA_FFMPEG_FFMPEG_COMMON_H_
134