Jack2: JackAC3Encoder.h Source File

Jack2 1.9.12

JackAC3Encoder.h
1 /*
2 Copyright (C) 2006 Jesse Chappell <jesse@essej.net> (AC3Jack)
3 Copyright (C) 2012 Grame
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
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18
19 */
20
21 #ifndef __JackAC3Encoder__
22 #define __JackAC3Encoder__
23
24 #include <aften/aften.h>
25 #include <aften/aften-types.h>
26
27 #include "ringbuffer.h"
28 #include "types.h"
29
30 #define MAX_AC3_CHANNELS 6
31
32 #define SPDIF_HEADER_SIZE 8
33 #define SPDIF_FRAME_SIZE 6144
34
35 #define SAMPLE_MAX_16BIT 32768.0f
36 #define SAMPLE_MAX_24BIT 8388608.0f
37
38 namespace Jack
39 {
40
41 struct JackAC3EncoderParams
42 {
43 int64_t duration;
44 unsigned int channels;
45 int bitdepth;
46 int bitrate;
47 unsigned int sample_rate;
48 bool lfe;
49 };
50
51 class JackAC3Encoder
52 {
53
54 private:
55
56 AftenContext fAftenContext;
57 jack_ringbuffer_t* fRingBuffer;
58
59 float* fSampleBuffer;
60 unsigned char* fAC3Buffer;
61 unsigned char* fZeroBuffer;
62
63 int fOutSizeByte;
64
65 jack_nframes_t fFramePos;
66 jack_nframes_t fSampleRate;
67 jack_nframes_t fByteRate;
68
69 void FillSpdifHeader(unsigned char* buf, int outsize);
70 int Output2Driver(float** outputs, jack_nframes_t nframes);
71
72 void sample_move_dS_s16(jack_default_audio_sample_t* dst, char *src, jack_nframes_t nsamples, unsigned long src_skip);
73 void sample_move_dS_s16_24ph(jack_default_audio_sample_t* dst, char *src, jack_nframes_t nsamples, unsigned long src_skip);
74
75 public:
76
77 #ifdef __ppc__
78 JackAC3Encoder(const JackAC3EncoderParams& params) {}
79 virtual ~JackAC3Encoder() {}
80
81 bool Init(jack_nframes_t sample_rate) {return false;}
82
83 void Process(float** inputs, float** outputs, int nframes) {}
84 void GetChannelName(const char* name, const char* alias, char* portname, int channel) {}
85 #else
86 JackAC3Encoder(const JackAC3EncoderParams& params);
87 virtual ~JackAC3Encoder();
88
89 bool Init(jack_nframes_t sample_rate);
90
91 void Process(float** inputs, float** outputs, int nframes);
92 void GetChannelName(const char* name, const char* alias, char* portname, int channel);
93 #endif
94 };
95
96 typedef JackAC3Encoder * JackAC3EncoderPtr;
97
98 } // end of namespace
99
100 #endif
ringbuffer.h
Jack::JackAC3EncoderParams
Definition: JackAC3Encoder.h:41
Jack::JackAC3Encoder
Definition: JackAC3Encoder.h:51
jack_ringbuffer_t
Definition: ringbuffer.h:51