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# csplugincommon/sndsys/convert.h

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    00001 /*
    00002     Copyright (C) 2004 by Andrew Mann
    00003
    00004     This library is free software; you can redistribute it and/or
    00005     modify it under the terms of the GNU Library General Public
    00006     License as published by the Free Software Foundation; either
    00007     version 2 of the License, or (at your option) any later version.
    00008
    00009     This library is distributed in the hope that it will be useful,
    00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00012     Library General Public License for more details.
    00013
    00014     You should have received a copy of the GNU Library General Public
    00015     License along with this library; if not, write to the Free
    00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
    00017 */
    00018
    00019 #ifndef __CS_SNDSYS_CONVERT_H__
    00020 #define __CS_SNDSYS_CONVERT_H__
    00021
    00032 #define CS_SOUND_ELEMENT_MAX_CHANNELS 8
    00033
    00056 #define CS_SOUND_INTERNAL_FREQUENCY_DIVISOR 1024
    00057
    00058 namespace CrystalSpace
    00059 {
    00060
    00100 class PCMSampleConverter
    00101 {
    00102 public:
    00104   PCMSampleConverter(int source_channels, int source_bitspersample,
    00105     int source_frequency, bool swap16=false);
    00106   ~PCMSampleConverter();
    00107
    00120   int GetRequiredOutputBufferMultiple(int dest_channels,
    00121     int dest_bitspersample, int dest_frequency);
    00122
    00123
    00134   int ConvertBuffer(const void *source, size_t source_len, void *dest,
    00135     int dest_channels, int dest_bitspersample, int dest_frequency);
    00136
    00151   void SetSourceProperties(int source_channels, int source_bitspersample,
    00152     int source_frequency);
    00153
    00154 protected:
    00155   bool ReadFullSample8(const void **source, size_t *source_len,
    00156     int *sample_buffer);
    00157   bool ReadFullSample16(const void **source, size_t *source_len,
    00158     int *sample_buffer);
    00159   bool ReadFullSample(const void **source, size_t  *source_len,
    00160     int *sample_buffer);
    00161   int WriteSample8(int *sample_buffer, void **dest, int dest_channels);
    00162   int WriteSample16(int *sample_buffer, void **dest, int dest_channels);
    00163   int WriteSample(int *sample_buffer, void **dest, int dest_channels,
    00164     int dest_bitspersample);
    00165   size_t AdvanceSourceSamples(const void **source, size_t *source_len,
    00166     size_t samples_to_advance, int *sample_buffer);
    00167
    00168 protected:
    00169   int last_sample[CS_SOUND_ELEMENT_MAX_CHANNELS];
    00170   int position_offset;
    00171   int src_channels,src_bytes,src_frequency;
    00172   bool swap_16;
    00173 };
    00174
    00175 } // namespace CrystalSpace
    00176
    00177 #endif // __CS_SNDSYS_CONVERT_H__