77 lines
3.1 KiB
C
77 lines
3.1 KiB
C
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/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_AUDIO_CHANNELS_H
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#define ANDROID_AUDIO_CHANNELS_H
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/** \cond */
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__BEGIN_DECLS
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/** \endcond */
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/**
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* Expands or contracts sample data from one interleaved channel format to another.
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* Expanded channels are filled with zeros and put at the end of each audio frame.
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* Contracted channels are omitted from the end of each audio frame.
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*
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* \param in_buff points to the buffer of samples
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* \param in_buff_chans Specifies the number of channels in the input buffer.
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* \param out_buff points to the buffer to receive converted samples.
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* \param out_buff_chans Specifies the number of channels in the output buffer.
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* \param sample_size_in_bytes Specifies the number of bytes per sample. 1, 2, 3, 4 are
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* currently valid.
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* \param num_in_bytes size of input buffer in BYTES
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*
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* \return
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* the number of BYTES of output data or 0 if an error occurs.
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*
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* \note
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* The out and sums buffers must either be completely separate (non-overlapping), or
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* they must both start at the same address. Partially overlapping buffers are not supported.
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*/
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size_t adjust_channels(const void* in_buff, size_t in_buff_chans,
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void* out_buff, size_t out_buff_chans,
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unsigned sample_size_in_bytes, size_t num_in_bytes);
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/**
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* Expands or contracts sample data from one interleaved channel format to another.
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* Extra expanded channels are left alone in the output buffer.
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* Contracted channels are omitted from the end of each audio frame.
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*
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* \param in_buff points to the buffer of samples
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* \param in_buff_chans Specifies the number of channels in the input buffer.
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* \param out_buff points to the buffer to receive converted samples.
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* \param out_buff_chans Specifies the number of channels in the output buffer.
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* \param sample_size_in_bytes Specifies the number of bytes per sample. 1, 2, 3, 4 are
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* currently valid.
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* \param num_in_bytes size of input buffer in BYTES
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*
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* \return
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* the number of BYTES of output data or 0 if an error occurs.
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*
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* \note
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* The out and in buffers must either be completely separate (non-overlapping), or
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* they must both start at the same address. Partially overlapping buffers are not supported.
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*/
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size_t adjust_selected_channels(const void* in_buff, size_t in_buff_chans,
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void* out_buff, size_t out_buff_chans,
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unsigned sample_size_in_bytes, size_t num_in_bytes);
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/** \cond */
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__END_DECLS
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/** \endcond */
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#endif
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