| /* |
| * 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. |
| */ |
| |
| #include "webrtc/modules/audio_coding/main/source/acm_pcma.h" |
| |
| #include "webrtc/modules/audio_coding/codecs/g711/include/g711_interface.h" |
| #include "webrtc/modules/audio_coding/main/source/acm_common_defs.h" |
| #include "webrtc/modules/audio_coding/main/source/acm_neteq.h" |
| #include "webrtc/modules/audio_coding/neteq/interface/webrtc_neteq.h" |
| #include "webrtc/modules/audio_coding/neteq/interface/webrtc_neteq_help_macros.h" |
| #include "webrtc/system_wrappers/interface/trace.h" |
| |
| // Codec interface |
| |
| namespace webrtc { |
| |
| namespace acm1 { |
| |
| ACMPCMA::ACMPCMA(int16_t codec_id) { |
| codec_id_ = codec_id; |
| } |
| |
| ACMPCMA::~ACMPCMA() { |
| return; |
| } |
| |
| int16_t ACMPCMA::InternalEncode(uint8_t* bitstream, |
| int16_t* bitstream_len_byte) { |
| *bitstream_len_byte = WebRtcG711_EncodeA(NULL, &in_audio_[in_audio_ix_read_], |
| frame_len_smpl_ * num_channels_, |
| (int16_t*) bitstream); |
| // Increment the read index this tell the caller that how far |
| // we have gone forward in reading the audio buffer. |
| in_audio_ix_read_ += frame_len_smpl_ * num_channels_; |
| return *bitstream_len_byte; |
| } |
| |
| int16_t ACMPCMA::DecodeSafe(uint8_t* /* bitstream */, |
| int16_t /* bitstream_len_byte */, |
| int16_t* /* audio */, |
| int16_t* /* audio_samples */, |
| int8_t* /* speech_type */) { |
| return 0; |
| } |
| |
| int16_t ACMPCMA::InternalInitEncoder( |
| WebRtcACMCodecParams* /* codec_params */) { |
| // This codec does not need initialization, PCM has no instance. |
| return 0; |
| } |
| |
| int16_t ACMPCMA::InternalInitDecoder( |
| WebRtcACMCodecParams* /* codec_params */) { |
| // This codec does not need initialization, PCM has no instance. |
| return 0; |
| } |
| |
| int32_t ACMPCMA::CodecDef(WebRtcNetEQ_CodecDef& codec_def, |
| const CodecInst& codec_inst) { |
| // Fill up the structure by calling |
| // "SET_CODEC_PAR" & "SET_PCMA_FUNCTION." |
| // Then call NetEQ to add the codec to it's database. |
| if (codec_inst.channels == 1) { |
| // Mono mode. |
| SET_CODEC_PAR(codec_def, kDecoderPCMa, codec_inst.pltype, NULL, 8000); |
| } else { |
| // Stereo mode. |
| SET_CODEC_PAR(codec_def, kDecoderPCMa_2ch, codec_inst.pltype, NULL, 8000); |
| } |
| SET_PCMA_FUNCTIONS(codec_def); |
| return 0; |
| } |
| |
| ACMGenericCodec* ACMPCMA::CreateInstance(void) { |
| return NULL; |
| } |
| |
| int16_t ACMPCMA::InternalCreateEncoder() { |
| // PCM has no instance. |
| return 0; |
| } |
| |
| int16_t ACMPCMA::InternalCreateDecoder() { |
| // PCM has no instance. |
| return 0; |
| } |
| |
| void ACMPCMA::InternalDestructEncoderInst(void* /* ptr_inst */) { |
| // PCM has no instance. |
| return; |
| } |
| |
| void ACMPCMA::DestructEncoderSafe() { |
| // PCM has no instance. |
| return; |
| } |
| |
| void ACMPCMA::DestructDecoderSafe() { |
| // PCM has no instance. |
| decoder_initialized_ = false; |
| decoder_exist_ = false; |
| return; |
| } |
| |
| // Split the stereo packet and place left and right channel after each other |
| // in the payload vector. |
| void ACMPCMA::SplitStereoPacket(uint8_t* payload, int32_t* payload_length) { |
| uint8_t right_byte; |
| |
| // Check for valid inputs. |
| assert(payload != NULL); |
| assert(*payload_length > 0); |
| |
| // Move one bytes representing right channel each loop, and place it at the |
| // end of the bytestream vector. After looping the data is reordered to: |
| // l1 l2 l3 l4 ... l(N-1) lN r1 r2 r3 r4 ... r(N-1) r(N), |
| // where N is the total number of samples. |
| for (int i = 0; i < *payload_length / 2; i++) { |
| right_byte = payload[i + 1]; |
| memmove(&payload[i + 1], &payload[i + 2], *payload_length - i - 2); |
| payload[*payload_length - 1] = right_byte; |
| } |
| } |
| |
| } // namespace acm1 |
| |
| } // namespace webrtc |