common/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