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+
+/*
+ * inptstrm.hh: Input stream classes for MPEG multiplexing
+ * TODO: Split into the base classes and the different types of
+ * actual input stream.
+ *
+ * Copyright (C) 2001 Andrew Stevens <andrew.stevens@philips.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __AUDIOSTRM_H__
+#define __AUDIOSTRM_H__
+
+#include "inputstrm.hh"
+
+class AudioStream:public ElementaryStream
+{
+public:
+ AudioStream (IBitStream & ibs, OutputStream & into);
+ virtual void Init (const int stream_num) = 0;
+ virtual void Close () = 0;
+
+ void OutputSector ();
+ bool RunOutComplete ();
+ virtual unsigned int NominalBitRate () = 0;
+
+ unsigned int num_syncword;
+ unsigned int num_frames[2];
+ unsigned int size_frames[2];
+ unsigned int version_id;
+ unsigned int layer;
+ unsigned int protection;
+ unsigned int bit_rate_code;
+ unsigned int frequency;
+ unsigned int mode;
+ unsigned int mode_extension;
+ unsigned int copyright;
+ unsigned int original_copy;
+ unsigned int emphasis;
+
+protected:
+ virtual bool AUBufferNeedsRefill ();
+ virtual void FillAUbuffer (unsigned int frames_to_buffer) = 0;
+ void InitAUbuffer ();
+
+ /* State variables for scanning source bit-stream */
+ unsigned int framesize;
+ unsigned int skip;
+ unsigned int samples_per_second;
+ unsigned long long int length_sum;
+ AAunit access_unit;
+};
+
+class MPAStream:public AudioStream
+{
+public:
+ MPAStream (IBitStream & ibs, OutputStream & into);
+ virtual void Init (const int stream_num);
+ static bool Probe (IBitStream & bs);
+ virtual void Close ();
+ virtual unsigned int NominalBitRate ();
+
+
+private:
+ void OutputHdrInfo ();
+ unsigned int SizeFrame (int bit_rate, int padding_bit);
+ virtual void FillAUbuffer (unsigned int frames_to_buffer);
+
+
+ /* State variables for scanning source bit-stream */
+ unsigned int framesize;
+ unsigned int skip;
+ unsigned int samples_per_second;
+};
+
+
+
+class AC3Stream:public AudioStream
+{
+public:
+ AC3Stream (IBitStream & ibs, OutputStream & into);
+ virtual void Init (const int stream_num);
+ static bool Probe (IBitStream & bs);
+ virtual void Close ();
+ virtual unsigned int NominalBitRate ();
+
+ virtual unsigned int ReadPacketPayload (uint8_t * dst, unsigned int to_read);
+ virtual unsigned int StreamHeaderSize ()
+ {
+ return 4;
+ }
+
+
+private:
+ void OutputHdrInfo ();
+ virtual void FillAUbuffer (unsigned int frames_to_buffer);
+
+ static const unsigned int default_buffer_size = 16 * 1024;
+
+ /* State variables for scanning source bit-stream */
+ unsigned int framesize;
+ unsigned int samples_per_second;
+ unsigned int bit_rate;
+ unsigned int stream_num;
+};
+
+class LPCMStream:public AudioStream
+{
+public:
+ LPCMStream (IBitStream & ibs, OutputStream & into);
+ virtual void Init (const int stream_num);
+ static bool Probe (IBitStream & bs);
+ virtual void Close ();
+ virtual unsigned int NominalBitRate ();
+
+ virtual unsigned int ReadPacketPayload (uint8_t * dst, unsigned int to_read);
+ virtual unsigned int StreamHeaderSize ()
+ {
+ return 7;
+ }
+
+
+private:
+ void OutputHdrInfo ();
+ virtual void FillAUbuffer (unsigned int frames_to_buffer);
+
+ static const unsigned int default_buffer_size = 232 * 1024;
+ static const unsigned int ticks_per_frame_90kHz = 150;
+
+ /* State variables for scanning source bit-stream */
+ unsigned int stream_num;
+ unsigned int samples_per_second;
+ unsigned int channels;
+ unsigned int bits_per_sample;
+ unsigned int bytes_per_frame;
+ unsigned int frame_index;
+ unsigned int dynamic_range_code;
+};
+
+
+#endif // __AUDIOSTRM_H__
+
+
+/*
+ * Local variables:
+ * c-file-style: "stroustrup"
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */