| /* |
| * Copyright (c) 2014 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. |
| */ |
| |
| #include "webrtc/modules/audio_processing/beamformer/pcm_utils.h" |
| |
| #include "webrtc/base/checks.h" |
| #include "webrtc/common_audio/include/audio_util.h" |
| #include "webrtc/modules/audio_processing/channel_buffer.h" |
| |
| namespace webrtc { |
| |
| size_t PcmRead(FILE* file, |
| size_t length, |
| int num_channels, |
| int16_t* const* buffer) { |
| CHECK_GE(num_channels, 1); |
| |
| scoped_ptr<int16_t[]> interleaved_buffer(new int16_t[length]); |
| size_t elements_read = fread(interleaved_buffer.get(), sizeof(int16_t), |
| length, file); |
| if (elements_read != length) { |
| // This is only an error if we haven't reached the end of the file. |
| CHECK_NE(0, feof(file)); |
| } |
| |
| Deinterleave(interleaved_buffer.get(), |
| static_cast<int>(elements_read) / num_channels, |
| num_channels, |
| buffer); |
| return elements_read; |
| } |
| |
| size_t PcmReadToFloat(FILE* file, |
| size_t length, |
| int num_channels, |
| float* const* buffer) { |
| CHECK_GE(num_channels, 1); |
| |
| int num_frames = static_cast<int>(length) / num_channels; |
| scoped_ptr<ChannelBuffer<int16_t> > deinterleaved_buffer( |
| new ChannelBuffer<int16_t>(num_frames, num_channels)); |
| |
| size_t elements_read = |
| PcmRead(file, length, num_channels, deinterleaved_buffer->channels()); |
| |
| for (int i = 0; i < num_channels; ++i) { |
| S16ToFloat(deinterleaved_buffer->channel(i), num_frames, buffer[i]); |
| } |
| return elements_read; |
| } |
| |
| void PcmWrite(FILE* file, |
| size_t length, |
| int num_channels, |
| const int16_t* const* buffer) { |
| CHECK_GE(num_channels, 1); |
| |
| scoped_ptr<int16_t[]> interleaved_buffer(new int16_t[length]); |
| Interleave(buffer, |
| static_cast<int>(length) / num_channels, |
| num_channels, |
| interleaved_buffer.get()); |
| CHECK_EQ(length, |
| fwrite(interleaved_buffer.get(), sizeof(int16_t), length, file)); |
| } |
| |
| void PcmWriteFromFloat(FILE* file, |
| size_t length, |
| int num_channels, |
| const float* const* buffer) { |
| CHECK_GE(num_channels, 1); |
| |
| int num_frames = static_cast<int>(length) / num_channels; |
| scoped_ptr<ChannelBuffer<int16_t> > deinterleaved_buffer( |
| new ChannelBuffer<int16_t>(num_frames, num_channels)); |
| |
| for (int i = 0; i < num_channels; ++i) { |
| FloatToS16(buffer[i], num_frames, deinterleaved_buffer->channel(i)); |
| } |
| PcmWrite(file, length, num_channels, deinterleaved_buffer->channels()); |
| } |
| |
| } // namespace webrtc |