mirror of
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315 lines
8.8 KiB
C++
315 lines
8.8 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/modules/audio_coding/main/acm2/acm_amr.h"
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#ifdef WEBRTC_CODEC_AMR
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// NOTE! GSM AMR is not included in the open-source package. The following
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// interface file is needed:
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#include "webrtc/modules/audio_coding/main/codecs/amr/interface/amr_interface.h"
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#include "webrtc/modules/audio_coding/main/interface/audio_coding_module_typedefs.h"
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#include "webrtc/modules/audio_coding/main/acm2/acm_common_defs.h"
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#include "webrtc/system_wrappers/interface/rw_lock_wrapper.h"
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#include "webrtc/system_wrappers/interface/trace.h"
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// The API in the header file should match the one below.
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//
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// int16_t WebRtcAmr_CreateEnc(AMR_encinst_t_** enc_inst);
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// int16_t WebRtcAmr_CreateDec(AMR_decinst_t_** dec_inst);
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// int16_t WebRtcAmr_FreeEnc(AMR_encinst_t_* enc_inst);
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// int16_t WebRtcAmr_FreeDec(AMR_decinst_t_* dec_inst);
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// int16_t WebRtcAmr_Encode(AMR_encinst_t_* enc_inst,
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// int16_t* input,
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// int16_t len,
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// int16_t*output,
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// int16_t mode);
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// int16_t WebRtcAmr_EncoderInit(AMR_encinst_t_* enc_inst,
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// int16_t dtx_mode);
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// int16_t WebRtcAmr_EncodeBitmode(AMR_encinst_t_* enc_inst,
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// int format);
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// int16_t WebRtcAmr_Decode(AMR_decinst_t_* dec_inst);
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// int16_t WebRtcAmr_DecodePlc(AMR_decinst_t_* dec_inst);
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// int16_t WebRtcAmr_DecoderInit(AMR_decinst_t_* dec_inst);
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// int16_t WebRtcAmr_DecodeBitmode(AMR_decinst_t_* dec_inst,
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// int format);
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#endif
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namespace webrtc {
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namespace acm2 {
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#ifndef WEBRTC_CODEC_AMR
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ACMAMR::ACMAMR(int16_t /* codec_id */)
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: encoder_inst_ptr_(NULL),
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encoding_mode_(-1), // Invalid value.
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encoding_rate_(0), // Invalid value.
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encoder_packing_format_(AMRBandwidthEfficient) {
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return;
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}
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ACMAMR::~ACMAMR() { return; }
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int16_t ACMAMR::InternalEncode(uint8_t* /* bitstream */,
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int16_t* /* bitstream_len_byte */) {
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return -1;
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}
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int16_t ACMAMR::EnableDTX() { return -1; }
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int16_t ACMAMR::DisableDTX() { return -1; }
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int16_t ACMAMR::InternalInitEncoder(WebRtcACMCodecParams* /* codec_params */) {
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return -1;
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}
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ACMGenericCodec* ACMAMR::CreateInstance(void) { return NULL; }
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int16_t ACMAMR::InternalCreateEncoder() { return -1; }
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void ACMAMR::DestructEncoderSafe() { return; }
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int16_t ACMAMR::SetBitRateSafe(const int32_t /* rate */) { return -1; }
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void ACMAMR::InternalDestructEncoderInst(void* /* ptr_inst */) { return; }
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int16_t ACMAMR::SetAMREncoderPackingFormat(
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ACMAMRPackingFormat /* packing_format */) {
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return -1;
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}
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ACMAMRPackingFormat ACMAMR::AMREncoderPackingFormat() const {
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return AMRUndefined;
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}
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int16_t ACMAMR::SetAMRDecoderPackingFormat(
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ACMAMRPackingFormat /* packing_format */) {
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return -1;
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}
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ACMAMRPackingFormat ACMAMR::AMRDecoderPackingFormat() const {
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return AMRUndefined;
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}
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#else //===================== Actual Implementation =======================
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#define WEBRTC_AMR_MR475 0
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#define WEBRTC_AMR_MR515 1
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#define WEBRTC_AMR_MR59 2
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#define WEBRTC_AMR_MR67 3
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#define WEBRTC_AMR_MR74 4
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#define WEBRTC_AMR_MR795 5
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#define WEBRTC_AMR_MR102 6
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#define WEBRTC_AMR_MR122 7
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ACMAMR::ACMAMR(int16_t codec_id)
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: encoder_inst_ptr_(NULL),
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encoding_mode_(-1), // invalid value
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encoding_rate_(0) { // invalid value
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codec_id_ = codec_id;
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has_internal_dtx_ = true;
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encoder_packing_format_ = AMRBandwidthEfficient;
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return;
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}
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ACMAMR::~ACMAMR() {
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if (encoder_inst_ptr_ != NULL) {
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WebRtcAmr_FreeEnc(encoder_inst_ptr_);
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encoder_inst_ptr_ = NULL;
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}
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return;
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}
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int16_t ACMAMR::InternalEncode(uint8_t* bitstream,
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int16_t* bitstream_len_byte) {
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int16_t vad_decision = 1;
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// sanity check, if the rate is set correctly. we might skip this
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// sanity check. if rate is not set correctly, initialization flag
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// should be false and should not be here.
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if ((encoding_mode_ < WEBRTC_AMR_MR475) ||
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(encoding_mode_ > WEBRTC_AMR_MR122)) {
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*bitstream_len_byte = 0;
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return -1;
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}
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*bitstream_len_byte = WebRtcAmr_Encode(encoder_inst_ptr_,
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&in_audio_[in_audio_ix_read_],
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frame_len_smpl_,
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reinterpret_cast<int16_t*>(bitstream),
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encoding_mode_);
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// Update VAD, if internal DTX is used
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if (has_internal_dtx_ && dtx_enabled_) {
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if (*bitstream_len_byte <= (7 * frame_len_smpl_ / 160)) {
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vad_decision = 0;
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}
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for (int16_t n = 0; n < MAX_FRAME_SIZE_10MSEC; n++) {
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vad_label_[n] = vad_decision;
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}
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}
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// increment the read index
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in_audio_ix_read_ += frame_len_smpl_;
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return *bitstream_len_byte;
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}
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int16_t ACMAMR::EnableDTX() {
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if (dtx_enabled_) {
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return 0;
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} else if (encoder_exist_) { // check if encoder exist
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// enable DTX
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if (WebRtcAmr_EncoderInit(encoder_inst_ptr_, 1) < 0) {
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return -1;
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}
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dtx_enabled_ = true;
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return 0;
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} else {
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return -1;
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}
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}
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int16_t ACMAMR::DisableDTX() {
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if (!dtx_enabled_) {
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return 0;
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} else if (encoder_exist_) { // check if encoder exist
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// disable DTX
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if (WebRtcAmr_EncoderInit(encoder_inst_ptr_, 0) < 0) {
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return -1;
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}
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dtx_enabled_ = false;
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return 0;
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} else {
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// encoder doesn't exists, therefore disabling is harmless
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return 0;
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}
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}
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int16_t ACMAMR::InternalInitEncoder(WebRtcACMCodecParams* codec_params) {
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int16_t status = SetBitRateSafe((codec_params->codec_inst).rate);
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status += (WebRtcAmr_EncoderInit(encoder_inst_ptr_,
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((codec_params->enable_dtx) ? 1 : 0)) < 0)
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? -1
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: 0;
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status +=
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(WebRtcAmr_EncodeBitmode(encoder_inst_ptr_, encoder_packing_format_) < 0)
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? -1
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: 0;
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return (status < 0) ? -1 : 0;
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}
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ACMGenericCodec* ACMAMR::CreateInstance(void) { return NULL; }
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int16_t ACMAMR::InternalCreateEncoder() {
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return WebRtcAmr_CreateEnc(&encoder_inst_ptr_);
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}
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void ACMAMR::DestructEncoderSafe() {
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if (encoder_inst_ptr_ != NULL) {
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WebRtcAmr_FreeEnc(encoder_inst_ptr_);
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encoder_inst_ptr_ = NULL;
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}
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// there is no encoder set the following
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encoder_exist_ = false;
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encoder_initialized_ = false;
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encoding_mode_ = -1; // invalid value
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encoding_rate_ = 0; // invalid value
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}
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int16_t ACMAMR::SetBitRateSafe(const int32_t rate) {
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switch (rate) {
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case 4750: {
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encoding_mode_ = WEBRTC_AMR_MR475;
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encoding_rate_ = 4750;
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break;
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}
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case 5150: {
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encoding_mode_ = WEBRTC_AMR_MR515;
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encoding_rate_ = 5150;
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break;
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}
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case 5900: {
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encoding_mode_ = WEBRTC_AMR_MR59;
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encoding_rate_ = 5900;
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break;
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}
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case 6700: {
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encoding_mode_ = WEBRTC_AMR_MR67;
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encoding_rate_ = 6700;
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break;
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}
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case 7400: {
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encoding_mode_ = WEBRTC_AMR_MR74;
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encoding_rate_ = 7400;
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break;
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}
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case 7950: {
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encoding_mode_ = WEBRTC_AMR_MR795;
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encoding_rate_ = 7950;
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break;
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}
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case 10200: {
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encoding_mode_ = WEBRTC_AMR_MR102;
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encoding_rate_ = 10200;
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break;
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}
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case 12200: {
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encoding_mode_ = WEBRTC_AMR_MR122;
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encoding_rate_ = 12200;
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break;
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}
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default: {
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return -1;
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}
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}
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return 0;
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}
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void ACMAMR::InternalDestructEncoderInst(void* ptr_inst) {
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// Free the memory where ptr_inst is pointing to
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if (ptr_inst != NULL) {
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WebRtcAmr_FreeEnc(static_cast<AMR_encinst_t_*>(ptr_inst));
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}
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return;
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}
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int16_t ACMAMR::SetAMREncoderPackingFormat(ACMAMRPackingFormat packing_format) {
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if ((packing_format != AMRBandwidthEfficient) &&
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(packing_format != AMROctetAlligned) &&
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(packing_format != AMRFileStorage)) {
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WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, unique_id_,
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"Invalid AMR Encoder packing-format.");
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return -1;
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} else {
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if (WebRtcAmr_EncodeBitmode(encoder_inst_ptr_, packing_format) < 0) {
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return -1;
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} else {
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encoder_packing_format_ = packing_format;
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return 0;
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}
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}
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}
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ACMAMRPackingFormat ACMAMR::AMREncoderPackingFormat() const {
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return encoder_packing_format_;
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}
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int16_t ACMAMR::SetAMRDecoderPackingFormat(
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ACMAMRPackingFormat /* packing_format */) {
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// Not implemented.
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return -1;
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}
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ACMAMRPackingFormat ACMAMR::AMRDecoderPackingFormat() const {
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// Not implemented.
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return AMRUndefined;
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}
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#endif
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} // namespace acm2
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} // namespace webrtc
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