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Diffstat (limited to 'akode/lib/audioframe.h')
| -rw-r--r-- | akode/lib/audioframe.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/akode/lib/audioframe.h b/akode/lib/audioframe.h new file mode 100644 index 0000000..d4cd09b --- /dev/null +++ b/akode/lib/audioframe.h @@ -0,0 +1,148 @@ +/* aKode AudioFrame + + Copyright (C) 2004,2006 Allan Sandfeld Jensen <kde@carewolf.com> + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public License + along with this library; see the file COPYING.LIB. If not, write to + the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor, + Boston, MA 02110-1301, USA. +*/ + +#ifndef _AKODE_AUDIOFRAME_H +#define _AKODE_AUDIOFRAME_H + +#include "akodelib.h" +#include "audioconfiguration.h" +#include <assert.h> + +namespace aKode { + +#define AKODE_POS_UNKNOWN -1 +#define AKODE_POS_EOF -2 +#define AKODE_POS_ERROR -3 + +//! The internal audio format + +/*! + * AudioFrames are used through-out akodelib as the mean of audiotransport. + * It derives from AudioConfiguration because it caries its own interpretation + * around with it. + */ +struct AudioFrame : public AudioConfiguration { +public: + AudioFrame() : length(0), max(0), data(0) {}; + ~AudioFrame() { freeSpace(); } + /*! + * Reserves space in the frame for atleast \a iLength samples of the + * configuration \a config. + */ + void reserveSpace(const AudioConfiguration *config, long iLength) { + reserveSpace(config->channels, iLength, config->sample_width); + sample_rate = config->sample_rate; + channel_config = config->channel_config; + surround_config = config->surround_config; + } + void reserveSpace(uint8_t iChannels, long iLength, int8_t iWidth) { + // Sanity + assert(iChannels > 0); + assert(iWidth != 0 && iWidth >= -64 && iWidth <= 32); + + // No reallocation needed + if ( data != 0 && channels == iChannels && + max >= iLength && sample_width == iWidth) + { + length = iLength; + return; + } + + // Reallocate + freeSpace(); + channels = iChannels; + length = max = iLength; + sample_width = iWidth; + if (length == 0) { + data = 0; + return; + } + data = new int8_t*[channels+1]; + int bytes = 0; + if (sample_width < 0) { + if (sample_width == -32) + bytes = 4; + else + if (sample_width == -64) + bytes = 8; + else + assert(false); + } + else { + bytes = (sample_width+7) / 8; + if (bytes == 3) bytes = 4; // 24bit uses 4 bytes + } + + for(int i=0; i<iChannels; i++) + data[i] = new int8_t[length*bytes]; + data[iChannels] = 0; + } + /*! + * Frees the space allocated for the buffer. + */ + void freeSpace() + { + if (!data) return; + int8_t** tmp = data; + while(*tmp) { + delete[] *tmp; + tmp++; + } + delete[] data; + pos = 0; + data = 0; + channels = 0; + length = 0; + max = 0; + } + /*! + * The current position in stream (measured in milliseconds) + * -1 if unknown + */ + long pos; + /*! + * The length of the frame in samples. + */ + long length; + /*! + * The maximum number of samples currently reserved in the frame. + */ + long max; + /*! + * The buffer is accessed according sample-width + * 1-8bit: int8_t, 9-16bit: int16_t, 17-32bit: int32_t + * -32bit: float, -64bit: double + */ + int8_t** data; +}; + +// evil function to swap the contents of two frames +inline void swapFrames(AudioFrame* toFrame, AudioFrame* fromFrame) { + AudioFrame tmpFrame; + + tmpFrame = *toFrame; + *toFrame = *fromFrame; + *fromFrame = tmpFrame; + tmpFrame.data = 0; +} + +} // namespace + +#endif |