1 /*
2 MIT License
3
4 Copyright (c) 2016 Błażej Szczygieł
5
6 Permission is hereby granted, free of charge, to any person obtaining a copy
7 of this software and associated documentation files (the "Software"), to deal
8 in the Software without restriction, including without limitation the rights
9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 copies of the Software, and to permit persons to whom the Software is
11 furnished to do so, subject to the following conditions:
12
13 The above copyright notice and this permission notice shall be included in all
14 copies or substantial portions of the Software.
15
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 SOFTWARE.
23 */
24
25 #include "WebMDemuxer.hpp"
26
27 #include "mkvparser/mkvparser.h"
28
29 #include <assert.h>
30 #include <stdlib.h>
31 #include <string.h>
32
WebMFrame()33 WebMFrame::WebMFrame() :
34 bufferSize(0), bufferCapacity(0),
35 buffer(NULL),
36 time(0),
37 key(false)
38 {}
~WebMFrame()39 WebMFrame::~WebMFrame()
40 {
41 free(buffer);
42 }
43
44 /**/
45
WebMDemuxer(mkvparser::IMkvReader * reader,int videoTrack,int audioTrack)46 WebMDemuxer::WebMDemuxer(mkvparser::IMkvReader *reader, int videoTrack, int audioTrack) :
47 m_reader(reader),
48 m_segment(NULL),
49 m_cluster(NULL), m_block(NULL), m_blockEntry(NULL),
50 m_blockFrameIndex(0),
51 m_videoTrack(NULL), m_vCodec(NO_VIDEO),
52 m_audioTrack(NULL), m_aCodec(NO_AUDIO),
53 m_isOpen(false),
54 m_eos(false)
55 {
56 long long pos = 0;
57 if (mkvparser::EBMLHeader().Parse(m_reader, pos))
58 return;
59
60 if (mkvparser::Segment::CreateInstance(m_reader, pos, m_segment))
61 return;
62
63 if (m_segment->Load() < 0)
64 return;
65
66 const mkvparser::Tracks *tracks = m_segment->GetTracks();
67 const unsigned long tracksCount = tracks->GetTracksCount();
68 int currVideoTrack = -1, currAudioTrack = -1;
69 for (unsigned long i = 0; i < tracksCount; ++i)
70 {
71 const mkvparser::Track *track = tracks->GetTrackByIndex(i);
72 if (const char *codecId = track->GetCodecId())
73 {
74 if ((!m_videoTrack || currVideoTrack != videoTrack) && track->GetType() == mkvparser::Track::kVideo)
75 {
76 if (!strcmp(codecId, "V_VP8"))
77 m_vCodec = VIDEO_VP8;
78 else if (!strcmp(codecId, "V_VP9"))
79 m_vCodec = VIDEO_VP9;
80 if (m_vCodec != NO_VIDEO)
81 m_videoTrack = static_cast<const mkvparser::VideoTrack *>(track);
82 ++currVideoTrack;
83 }
84 if ((!m_audioTrack || currAudioTrack != audioTrack) && track->GetType() == mkvparser::Track::kAudio)
85 {
86 if (!strcmp(codecId, "A_VORBIS"))
87 m_aCodec = AUDIO_VORBIS;
88 else if (!strcmp(codecId, "A_OPUS"))
89 m_aCodec = AUDIO_OPUS;
90 if (m_aCodec != NO_AUDIO)
91 m_audioTrack = static_cast<const mkvparser::AudioTrack *>(track);
92 ++currAudioTrack;
93 }
94 }
95 }
96 if (!m_videoTrack && !m_audioTrack)
97 return;
98
99 m_isOpen = true;
100 }
~WebMDemuxer()101 WebMDemuxer::~WebMDemuxer()
102 {
103 delete m_segment;
104 delete m_reader;
105 }
106
getLength() const107 double WebMDemuxer::getLength() const
108 {
109 return m_segment->GetDuration() / 1e9;
110 }
111
getVideoCodec() const112 WebMDemuxer::VIDEO_CODEC WebMDemuxer::getVideoCodec() const
113 {
114 return m_vCodec;
115 }
getWidth() const116 int WebMDemuxer::getWidth() const
117 {
118 return m_videoTrack->GetWidth();
119 }
getHeight() const120 int WebMDemuxer::getHeight() const
121 {
122 return m_videoTrack->GetHeight();
123 }
124
getAudioCodec() const125 WebMDemuxer::AUDIO_CODEC WebMDemuxer::getAudioCodec() const
126 {
127 return m_aCodec;
128 }
getAudioExtradata(size_t & size) const129 const unsigned char *WebMDemuxer::getAudioExtradata(size_t &size) const
130 {
131 return m_audioTrack->GetCodecPrivate(size);
132 }
getSampleRate() const133 double WebMDemuxer::getSampleRate() const
134 {
135 return m_audioTrack->GetSamplingRate();
136 }
getChannels() const137 int WebMDemuxer::getChannels() const
138 {
139 return m_audioTrack->GetChannels();
140 }
getAudioDepth() const141 int WebMDemuxer::getAudioDepth() const
142 {
143 return m_audioTrack->GetBitDepth();
144 }
145
readFrame(WebMFrame * videoFrame,WebMFrame * audioFrame)146 bool WebMDemuxer::readFrame(WebMFrame *videoFrame, WebMFrame *audioFrame)
147 {
148 const long videoTrackNumber = (videoFrame && m_videoTrack) ? m_videoTrack->GetNumber() : 0;
149 const long audioTrackNumber = (audioFrame && m_audioTrack) ? m_audioTrack->GetNumber() : 0;
150 bool blockEntryEOS = false;
151
152 if (videoFrame)
153 videoFrame->bufferSize = 0;
154 if (audioFrame)
155 audioFrame->bufferSize = 0;
156
157 if (videoTrackNumber == 0 && audioTrackNumber == 0)
158 return false;
159
160 if (m_eos)
161 return false;
162
163 if (!m_cluster)
164 m_cluster = m_segment->GetFirst();
165
166 do
167 {
168 bool getNewBlock = false;
169 long status = 0;
170 if (!m_blockEntry && !blockEntryEOS)
171 {
172 status = m_cluster->GetFirst(m_blockEntry);
173 getNewBlock = true;
174 }
175 else if (blockEntryEOS || m_blockEntry->EOS())
176 {
177 m_cluster = m_segment->GetNext(m_cluster);
178 if (!m_cluster || m_cluster->EOS())
179 {
180 m_eos = true;
181 return false;
182 }
183 status = m_cluster->GetFirst(m_blockEntry);
184 blockEntryEOS = false;
185 getNewBlock = true;
186 }
187 else if (!m_block || m_blockFrameIndex == m_block->GetFrameCount() || notSupportedTrackNumber(videoTrackNumber, audioTrackNumber))
188 {
189 status = m_cluster->GetNext(m_blockEntry, m_blockEntry);
190 if (!m_blockEntry || m_blockEntry->EOS())
191 {
192 blockEntryEOS = true;
193 continue;
194 }
195 getNewBlock = true;
196 }
197 if (status || !m_blockEntry)
198 return false;
199 if (getNewBlock)
200 {
201 m_block = m_blockEntry->GetBlock();
202 m_blockFrameIndex = 0;
203 }
204 } while (blockEntryEOS || notSupportedTrackNumber(videoTrackNumber, audioTrackNumber));
205
206 WebMFrame *frame = NULL;
207
208 const long trackNumber = m_block->GetTrackNumber();
209 if (trackNumber == videoTrackNumber)
210 frame = videoFrame;
211 else if (trackNumber == audioTrackNumber)
212 frame = audioFrame;
213 else
214 {
215 //Should not be possible
216 assert(trackNumber == videoTrackNumber || trackNumber == audioTrackNumber);
217 return false;
218 }
219
220 const mkvparser::Block::Frame &blockFrame = m_block->GetFrame(m_blockFrameIndex++);
221 if (blockFrame.len > frame->bufferCapacity)
222 {
223 unsigned char *newBuff = (unsigned char *)realloc(frame->buffer, frame->bufferCapacity = blockFrame.len);
224 if (newBuff)
225 frame->buffer = newBuff;
226 else // Out of memory
227 return false;
228 }
229 frame->bufferSize = blockFrame.len;
230
231 frame->time = m_block->GetTime(m_cluster) / 1e9;
232 frame->key = m_block->IsKey();
233
234 return !blockFrame.Read(m_reader, frame->buffer);
235 }
236
notSupportedTrackNumber(long videoTrackNumber,long audioTrackNumber) const237 inline bool WebMDemuxer::notSupportedTrackNumber(long videoTrackNumber, long audioTrackNumber) const
238 {
239 const long trackNumber = m_block->GetTrackNumber();
240 return (trackNumber != videoTrackNumber && trackNumber != audioTrackNumber);
241 }
242