src/modules/audio_coding/main/source/acm_cng.cc

/*
 *  Copyright (c) 2011 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 "acm_cng.h"
#include "acm_codec_database.h"
#include "acm_common_defs.h"
#include "acm_neteq.h"
#include "trace.h"
#include "webrtc_cng.h"
#include "webrtc_neteq.h"
#include "webrtc_neteq_help_macros.h"

namespace webrtc {

ACMCNG::ACMCNG(WebRtc_Word16 codecID) {
  _encoderInstPtr = NULL;
  _decoderInstPtr = NULL;
  _codecID = codecID;
  _sampFreqHz = ACMCodecDB::CodecFreq(_codecID);
  return;
}

ACMCNG::~ACMCNG() {
  if (_encoderInstPtr != NULL) {
    WebRtcCng_FreeEnc(_encoderInstPtr);
    _encoderInstPtr = NULL;
  }
  if (_decoderInstPtr != NULL) {
    WebRtcCng_FreeDec(_decoderInstPtr);
    _decoderInstPtr = NULL;
  }
  return;
}

// CNG is not like a regular encoder, this function
// should not be called normally
// instead the following function is called from inside
// ACMGenericCodec::ProcessFrameVADDTX
WebRtc_Word16 ACMCNG::InternalEncode(WebRtc_UWord8* /* bitStream */,
                                     WebRtc_Word16* /* bitStreamLenByte */) {
  return -1;
}

WebRtc_Word16 ACMCNG::DecodeSafe(WebRtc_UWord8* /* bitStream */,
                                 WebRtc_Word16 /* bitStreamLenByte */,
                                 WebRtc_Word16* /* audio */,
                                 WebRtc_Word16* /* audioSamples */,
                                 WebRtc_Word8* /* speechType */) {
  return 0;
}

// CNG is not like a regular encoder,
// this function should not be called normally
// instead the following function is called from inside
// ACMGenericCodec::ProcessFrameVADDTX
WebRtc_Word16 ACMCNG::InternalInitEncoder(
    WebRtcACMCodecParams* /* codecParams */) {
  return -1;
}

WebRtc_Word16 ACMCNG::InternalInitDecoder(
    WebRtcACMCodecParams* /* codecParams */) {
  return WebRtcCng_InitDec(_decoderInstPtr);
}

WebRtc_Word32 ACMCNG::CodecDef(WebRtcNetEQ_CodecDef& codecDef,
                               const CodecInst& codecInst) {
  if (!_decoderInitialized) {
    // TODO (tlegrand): log error
    return -1;
  }
  // Fill up the structure by calling
  // "SET_CODEC_PAR" & "SET_CNG_FUNCTION."
  // Then return the structure back to NetEQ to add the codec to it's
  // database.

  if (_sampFreqHz == 8000 || _sampFreqHz == 16000 || _sampFreqHz == 32000) {
    SET_CODEC_PAR((codecDef), kDecoderCNG, codecInst.pltype,
        _decoderInstPtr, _sampFreqHz);
    SET_CNG_FUNCTIONS((codecDef));
    return 0;
  } else {
    return -1;
  }
}

ACMGenericCodec* ACMCNG::CreateInstance(void) {
  return NULL;
}

WebRtc_Word16 ACMCNG::InternalCreateEncoder() {
  if (WebRtcCng_CreateEnc(&_encoderInstPtr) < 0) {
    _encoderInstPtr = NULL;
    return -1;
  } else {
    return 0;
  }
}

void ACMCNG::DestructEncoderSafe() {
  if (_encoderInstPtr != NULL) {
    WebRtcCng_FreeEnc(_encoderInstPtr);
    _encoderInstPtr = NULL;
  }
  _encoderExist = false;
  _encoderInitialized = false;
}

WebRtc_Word16 ACMCNG::InternalCreateDecoder() {
  if (WebRtcCng_CreateDec(&_decoderInstPtr) < 0) {
    _decoderInstPtr = NULL;
    return -1;
  } else {
    return 0;
  }
}

void ACMCNG::DestructDecoderSafe() {
  if (_decoderInstPtr != NULL) {
    WebRtcCng_FreeDec(_decoderInstPtr);
    _decoderInstPtr = NULL;
  }
  _decoderExist = false;
  _decoderInitialized = false;
}

void ACMCNG::InternalDestructEncoderInst(void* ptrInst) {
  if (ptrInst != NULL) {
    WebRtcCng_FreeEnc(static_cast<CNG_enc_inst*>(ptrInst));
  }
  return;
}

WebRtc_Word16 ACMCNG::UnregisterFromNetEqSafe(ACMNetEQ* netEq,
                                              WebRtc_Word16 payloadType) {
  if (payloadType != _decoderParams.codecInstant.pltype) {
    WEBRTC_TRACE(
                 webrtc::kTraceError,
                 webrtc::kTraceAudioCoding,
                 _uniqueID,
                 "Cannot unregister codec %s given payload-type %d does not "
                 "match the stored payload type",
                 _decoderParams.codecInstant.plname, payloadType,
                 _decoderParams.codecInstant.pltype);
    return -1;
  }
  return netEq->RemoveCodec(kDecoderCNG);
}

} // namespace webrtc