1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
|
/*
* mpeg.c: Frontend Status Monitor plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#include "tools.h"
#include "mpeg.h"
#define IS_EXTENSION_START(buf) (((buf)[0] == 0x00) && ((buf)[1] == 0x00) && ((buf)[2] == 0x01) && ((buf)[3] == 0xB5))
int cFemonMPEG::bitrateS[2][3][16] =
{
{
{0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, -1}, // MPEG-2 Layer I
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1}, // MPEG-2 Layer II/III
{0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1} // MPEG-2 Layer II/III
},
{
{0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, -1}, // MPEG-1 Layer I
{0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, -1}, // MPEG-1 Layer II
{0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, -1} // MPEG-1 Layer III
}
};
int cFemonMPEG::sampleRateS[2][4] =
{
{22050, 24000, 16000, -1}, // MPEG-2
{44100, 48000, 32000, -1} // MPEG-1
};
eAudioCodec cFemonMPEG::formatS[2][4] =
{
{AUDIO_CODEC_MPEG2_I, AUDIO_CODEC_MPEG2_II, AUDIO_CODEC_MPEG2_III, AUDIO_CODEC_UNKNOWN}, // MPEG-2
{AUDIO_CODEC_MPEG1_I, AUDIO_CODEC_MPEG1_II, AUDIO_CODEC_MPEG1_III, AUDIO_CODEC_UNKNOWN} // MPEG-1
};
cFemonMPEG::cFemonMPEG(cFemonVideoIf *videoHandlerP, cFemonAudioIf *audioHandlerP)
: videoHandlerM(videoHandlerP),
audioHandlerM(audioHandlerP)
{
}
cFemonMPEG::~cFemonMPEG()
{
}
bool cFemonMPEG::processAudio(const uint8_t *bufP, int lenP)
{
cFemonBitStream bs(bufP, lenP * 8);
if (!audioHandlerM)
return false;
// skip PES header
if (!PesLongEnough(lenP))
return false;
bs.SkipBits(8 * PesPayloadOffset(bufP));
// MPEG audio detection
if (bs.GetBits(12) != 0xFFF) // syncword
return false;
int id = bs.GetBit(); // id: MPEG-2=0, MPEG-1=1
int layer = 3 - bs.GetBits(2); // layer: I=11, II=10, III=01
bs.SkipBit(); // protection bit
int bit_rate_index = bs.GetBits(4); // bitrate index
int sampling_frequency = bs.GetBits(2); // sampling frequency
bs.SkipBit(); // padding bit
bs.SkipBit(); // private pid
int mode = bs.GetBits(2); // mode
audioHandlerM->SetAudioCodec(formatS[id][layer]);
switch (mode) {
case 0:
audioHandlerM->SetAudioChannel(AUDIO_CHANNEL_MODE_STEREO);
break;
case 1:
audioHandlerM->SetAudioChannel(AUDIO_CHANNEL_MODE_JOINT_STEREO);
break;
case 2:
audioHandlerM->SetAudioChannel(AUDIO_CHANNEL_MODE_DUAL);
break;
case 3:
audioHandlerM->SetAudioChannel(AUDIO_CHANNEL_MODE_SINGLE);
break;
default:
audioHandlerM->SetAudioChannel(AUDIO_CHANNEL_MODE_INVALID);
break;
}
switch (bit_rate_index) {
case 0:
audioHandlerM->SetAudioBitrate(AUDIO_BITRATE_FREE);
break;
case 0xF:
audioHandlerM->SetAudioBitrate(AUDIO_BITRATE_RESERVED);
break;
default:
audioHandlerM->SetAudioBitrate(1000 * bitrateS[id][layer][bit_rate_index]);
break;
}
switch (sampling_frequency) {
case 3:
audioHandlerM->SetAudioSamplingFrequency(AUDIO_SAMPLING_FREQUENCY_RESERVED);
break;
default:
audioHandlerM->SetAudioSamplingFrequency(sampleRateS[id][sampling_frequency]);
break;
}
return true;
}
bool cFemonMPEG::processVideo(const uint8_t *bufP, int lenP)
{
cFemonBitStream bs(bufP, lenP * 8);
if (!videoHandlerM)
return false;
// skip PES header
if (!PesLongEnough(lenP))
return false;
bs.SkipBits(8 * PesPayloadOffset(bufP));
// MPEG-2 video detection, search for start code
if (bs.GetBits(32) != 0x000001B3) // sequence header
return false;
int scan = VIDEO_SCAN_UNKNOWN;
int format = VIDEO_FORMAT_UNKNOWN;
int aspect = VIDEO_ASPECT_RATIO_RESERVED;
int horizontal_size = bs.GetBits(12); // horizontal size value
int vertical_size = bs.GetBits(12); // vertical size value
switch (bs.GetBits(4)) { // aspect ratio information
case 1:
aspect = VIDEO_ASPECT_RATIO_1_1;
break;
case 2:
aspect = VIDEO_ASPECT_RATIO_4_3;
break;
case 3:
aspect = VIDEO_ASPECT_RATIO_16_9;
break;
case 4:
aspect = VIDEO_ASPECT_RATIO_2_21_1;
break;
case 5 ... 15:
default:
aspect = VIDEO_ASPECT_RATIO_RESERVED;
break;
}
double frame_rate = 0;
switch (bs.GetBits(4)) { // frame rate code
case 1:
frame_rate = 24000 / 1001.0;
format = VIDEO_FORMAT_UNKNOWN;
break;
case 2:
frame_rate = 24.0;
format = VIDEO_FORMAT_UNKNOWN;
break;
case 3:
frame_rate = 25.0;
format = VIDEO_FORMAT_PAL;
break;
case 4:
frame_rate = 30000 / 1001.0;
format = VIDEO_FORMAT_NTSC;
break;
case 5:
frame_rate = 30.0;
format = VIDEO_FORMAT_NTSC;
break;
case 6:
frame_rate = 50.0;
format = VIDEO_FORMAT_PAL;
break;
case 7:
frame_rate = 60.0;
format = VIDEO_FORMAT_NTSC;
break;
case 8:
frame_rate = 60000 / 1001.0;
format = VIDEO_FORMAT_NTSC;
break;
case 9 ... 15:
default:
frame_rate = 0;
format = VIDEO_FORMAT_UNKNOWN;
break;
}
int bit_rate = bs.GetBits(18); // bit rate value
bs.SkipBit(); // marker bit
bs.SkipBits(10); // vbv buffer size value
bs.SkipBit(); // constrained parameters value
if (bs.GetBit()) // load intra quantizer matrix
bs.SkipBits(8 * 64); // intra quantizer matrix
if (bs.GetBit()) // load non-intra quantizer matrix
bs.SkipBits(8 * 64); // non-intra quantizer matrix
if (bs.GetBits(32) != 0x000001B5) { // extension start
bs.SkipBits(4); // extension start code identifier
bs.SkipBits(8); // profile and level indicator
scan = bs.GetBit() ? VIDEO_SCAN_PROGRESSIVE :
VIDEO_SCAN_INTERLACED; // progressive sequence
bs.SkipBits(2); // chroma format
horizontal_size |= (bs.GetBits(2) << 12); // horizontal size extension
vertical_size |= (bs.GetBits(2) << 12); // vertical size extension
bit_rate |= (bs.GetBits(12) << 18); // bit rate extension
bs.SkipBit(); // marker bit
bs.SkipBits(8); // vpv buffer size extension
bs.SkipBit(); // low delay
bs.SkipBits(2); // frame rate extension n
bs.SkipBits(5); // frame rate extension d
if ((bs.GetBits(32) != 0x000001B5) && // extension start code
(bs.GetBits(4) == 0x0010)) { // sequence display extension id
switch (bs.GetBits(3)) { // video format
case 0x000:
format = VIDEO_FORMAT_COMPONENT;
break;
case 0x001:
format = VIDEO_FORMAT_PAL;
break;
case 0x010:
format = VIDEO_FORMAT_NTSC;
break;
case 0x011:
format = VIDEO_FORMAT_SECAM;
break;
case 0x100:
format = VIDEO_FORMAT_MAC;
break;
case 0x101:
format = VIDEO_FORMAT_UNKNOWN;
break;
case 0x110:
case 0x111:
format = VIDEO_FORMAT_RESERVED;
break;
default:
format = VIDEO_FORMAT_INVALID;
break;
}
}
}
videoHandlerM->SetVideoCodec(VIDEO_CODEC_MPEG2);
videoHandlerM->SetVideoSize(horizontal_size, vertical_size);
videoHandlerM->SetVideoBitrate(400.0 * (double)(bit_rate));
videoHandlerM->SetVideoFramerate(frame_rate);
videoHandlerM->SetVideoScan(eVideoScan(scan));
videoHandlerM->SetVideoAspectRatio(eVideoAspectRatio(aspect));
videoHandlerM->SetVideoFormat(eVideoFormat(format));
return true;
}
|
