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      1 /*
      2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include "webrtc/modules/audio_coding/main/acm2/acm_pcm16b.h"
     12 
     13 #ifdef WEBRTC_CODEC_PCM16
     14 #include "webrtc/modules/audio_coding/codecs/pcm16b/include/pcm16b.h"
     15 #include "webrtc/modules/audio_coding/main/acm2/acm_codec_database.h"
     16 #include "webrtc/modules/audio_coding/main/acm2/acm_common_defs.h"
     17 #include "webrtc/system_wrappers/interface/trace.h"
     18 #endif
     19 
     20 namespace webrtc {
     21 
     22 namespace acm2 {
     23 
     24 #ifndef WEBRTC_CODEC_PCM16
     25 
     26 ACMPCM16B::ACMPCM16B(int16_t /* codec_id */) { return; }
     27 
     28 ACMPCM16B::~ACMPCM16B() { return; }
     29 
     30 int16_t ACMPCM16B::InternalEncode(uint8_t* /* bitstream */,
     31                                   int16_t* /* bitstream_len_byte */) {
     32   return -1;
     33 }
     34 
     35 int16_t ACMPCM16B::InternalInitEncoder(
     36     WebRtcACMCodecParams* /* codec_params */) {
     37   return -1;
     38 }
     39 
     40 ACMGenericCodec* ACMPCM16B::CreateInstance(void) { return NULL; }
     41 
     42 int16_t ACMPCM16B::InternalCreateEncoder() { return -1; }
     43 
     44 void ACMPCM16B::InternalDestructEncoderInst(void* /* ptr_inst */) { return; }
     45 
     46 void ACMPCM16B::DestructEncoderSafe() { return; }
     47 
     48 #else  //===================== Actual Implementation =======================
     49 ACMPCM16B::ACMPCM16B(int16_t codec_id) {
     50   codec_id_ = codec_id;
     51   sampling_freq_hz_ = ACMCodecDB::CodecFreq(codec_id_);
     52 }
     53 
     54 ACMPCM16B::~ACMPCM16B() { return; }
     55 
     56 int16_t ACMPCM16B::InternalEncode(uint8_t* bitstream,
     57                                   int16_t* bitstream_len_byte) {
     58   *bitstream_len_byte = WebRtcPcm16b_Encode(&in_audio_[in_audio_ix_read_],
     59                                             frame_len_smpl_ * num_channels_,
     60                                             bitstream);
     61   // Increment the read index to tell the caller that how far
     62   // we have gone forward in reading the audio buffer.
     63   in_audio_ix_read_ += frame_len_smpl_ * num_channels_;
     64   return *bitstream_len_byte;
     65 }
     66 
     67 int16_t ACMPCM16B::InternalInitEncoder(
     68     WebRtcACMCodecParams* /* codec_params */) {
     69   // This codec does not need initialization, PCM has no instance.
     70   return 0;
     71 }
     72 
     73 ACMGenericCodec* ACMPCM16B::CreateInstance(void) { return NULL; }
     74 
     75 int16_t ACMPCM16B::InternalCreateEncoder() {
     76   // PCM has no instance.
     77   return 0;
     78 }
     79 
     80 void ACMPCM16B::InternalDestructEncoderInst(void* /* ptr_inst */) {
     81   // PCM has no instance.
     82   return;
     83 }
     84 
     85 void ACMPCM16B::DestructEncoderSafe() {
     86   // PCM has no instance.
     87   encoder_exist_ = false;
     88   encoder_initialized_ = false;
     89   return;
     90 }
     91 
     92 #endif
     93 
     94 }  // namespace acm2
     95 
     96 }  // namespace webrtc
     97