voice_engine/utility.h

/*
 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

/*
 *  Contains functions often used by different parts of VoiceEngine.
 */

#ifndef WEBRTC_VOICE_ENGINE_UTILITY_H_
#define WEBRTC_VOICE_ENGINE_UTILITY_H_

#include "webrtc/common_audio/resampler/include/push_resampler.h"
#include "webrtc/typedefs.h"

namespace webrtc {

class AudioFrame;

namespace voe {

// Upmix or downmix and resample the audio in |src_frame| to |dst_frame|.
// Expects |dst_frame| to have its sample rate and channels members set to the
// desired values. Updates the samples per channel member accordingly. No other
// members will be changed.
void RemixAndResample(const AudioFrame& src_frame,
                      PushResampler<int16_t>* resampler,
                      AudioFrame* dst_frame);

// Downmix and downsample the audio in |src_data| to |dst_af| as necessary,
// specified by |codec_num_channels| and |codec_rate_hz|. |mono_buffer| is
// temporary space and must be of sufficient size to hold the downmixed source
// audio (recommend using a size of kMaxMonoDataSizeSamples).
//
// |dst_af| will have its data and format members (sample rate, channels and
// samples per channel) set appropriately. No other members will be changed.
// TODO(ajm): For now, this still calls Reset() on |dst_af|. Remove this, as
// it shouldn't be needed.
void DownConvertToCodecFormat(const int16_t* src_data,
                              int samples_per_channel,
                              int num_channels,
                              int sample_rate_hz,
                              int codec_num_channels,
                              int codec_rate_hz,
                              int16_t* mono_buffer,
                              PushResampler<int16_t>* resampler,
                              AudioFrame* dst_af);

void MixWithSat(int16_t target[],
                int target_channel,
                const int16_t source[],
                int source_channel,
                int source_len);

}  // namespace voe
}  // namespace webrtc

#endif  // WEBRTC_VOICE_ENGINE_UTILITY_H_