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68 lines
2.5 KiB
68 lines
2.5 KiB
/*
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** Copyright 2011, 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_ECHO_REFERENCE_H
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#define ANDROID_ECHO_REFERENCE_H
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#include <stdint.h>
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#include <sys/time.h>
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__BEGIN_DECLS
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/** Buffer descriptor used by read() and write() methods, including the time stamp and delay. */
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struct echo_reference_buffer {
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void *raw; // pointer to audio frame
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size_t frame_count; // number of frames in buffer
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int32_t delay_ns; // delay for this buffer (see comment below)
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struct timespec time_stamp; // time stamp for this buffer (see comment below)
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// default ALSA gettimeofday() format
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};
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/**
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* + as input:
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* - delay_ns is the delay introduced by playback buffers
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* - time_stamp is the time stamp corresponding to the delay calculation
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* + as output:
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* unused
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* when used for EchoReference::read():
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* + as input:
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* - delay_ns is the delay introduced by capture buffers
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* - time_stamp is the time stamp corresponding to the delay calculation
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* + as output:
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* - delay_ns is the delay between the returned frames and the capture time derived from
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* delay and time stamp indicated as input. This delay is to be communicated to the AEC.
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* - frame_count is updated with the actual number of frames returned
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*/
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struct echo_reference_itfe {
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int (*read)(struct echo_reference_itfe *echo_reference, struct echo_reference_buffer *buffer);
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int (*write)(struct echo_reference_itfe *echo_reference, struct echo_reference_buffer *buffer);
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};
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int create_echo_reference(audio_format_t rdFormat,
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uint32_t rdChannelCount,
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uint32_t rdSamplingRate,
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audio_format_t wrFormat,
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uint32_t wrChannelCount,
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uint32_t wrSamplingRate,
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struct echo_reference_itfe **);
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void release_echo_reference(struct echo_reference_itfe *echo_reference);
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__END_DECLS
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#endif // ANDROID_ECHO_REFERENCE_H
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