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