Glow Singing Voice Conversion

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Disclaimer

The project is so-vits-svc non-end-to-end version, Acoustic model is Glow-TTS, is currently a Beta version, there are a lot of bug (didn't even change the Readme).

📏 Terms of Use

Warning: Please ensure that you address any authorization issues related to the dataset on your own. You bear full responsibility for any problems arising from the usage of non-authorized datasets for training, as well as any resulting consequences. The repository and its maintainerdisclaim any association with or liability for the consequences.

1. This project is exclusively established for academic purposes, aiming to facilitate communication and learning. It is not intended for deployment in production environments.
2. Any Glow-SVC-based video posted to a video platform must clearly specify in the introduction the input source vocals and audio used for the voice changer conversion, e.g., if you use someone else's video/audio and convert it by separating the vocals as the input source, you must give a clear link to the original video or music; if you use your own vocals or a voice synthesized by another voice synthesis engine as the input source, you must also state this in your introduction.
3. You are solely responsible for any infringement issues caused by the input source and all consequences. When using other commercial vocal synthesis software as an input source, please ensure that you comply with the regulations of that software, noting that the regulations of many vocal synthesis engines explicitly state that they cannot be used to convert input sources!
4. Engaging in illegal activities, as well as religious and political activities, is strictly prohibited when using this project. The project developers vehemently oppose the aforementioned activities. If you disagree with this provision, the usage of the project is prohibited.
5. If you continue to use the program, you will be deemed to have agreed to the terms and conditions set forth in README and README has discouraged you and is not responsible for any subsequent problems.
6. If you intend to employ this project for any other purposes, kindly contact and inform the maintainers of this repository in advance.

📝 Model Introduction

The project is so-vits-svc non-end-to-end version, Acoustic model is Glow-TTS, is currently a Beta version, there are a lot of bug (didn't even change the Readme).

🆕 Shallow diffusion

💬 Python Version

Based on our testing, we have determined that the project runs stable on Python 3.8.9.

📥 Pre-trained Model Files

Required

NSF-HIFIGAN

• Pre-trained NSF-HIFIGAN Vocoder: nsf_hifigan_20221211.zip
  • Unzip and place the four files under the pretrain/nsf_hifigan directory

# nsf_hifigan
wget -P pretrain/ https://github.com/openvpi/vocoders/releases/download/nsf-hifigan-v1/nsf_hifigan_20221211.zip
unzip -od pretrain/nsf_hifigan pretrain/nsf_hifigan_20221211.zip
# Alternatively, you can manually download and place it in the pretrain/nsf_hifigan directory
# URL: https://github.com/openvpi/vocoders/releases/tag/nsf-hifigan-v1

You need to select one encoder from the list below

1. If using contentvec as speech encoder(recommended)

vec768l12 and vec256l9 require the encoder

• ContentVec: checkpoint_best_legacy_500.pt
  • Place it under the pretrain directory

Or download the following ContentVec, which is only 199MB in size but has the same effect:

• ContentVec: hubert_base.pt
  • Change the file name to checkpoint_best_legacy_500.pt and place it in the pretrain directory

# contentvec
wget -P pretrain/ https://huggingface.co/lj1995/VoiceConversionWebUI/resolve/main/hubert_base.pt -O checkpoint_best_legacy_500.pt
# Alternatively, you can manually download and place it in the hubert directory

2. If hubertsoft is used as the speech encoder

• soft vc hubert: hubert-soft-0d54a1f4.pt
  • Place it under the pretrain directory

3. If whisper-ppg as the encoder

• download model at medium.pt, the model fits whisper-ppg
• or download model at large-v2.pt, the model fits whisper-ppg-large
  • Place it under the pretrain directory

4. If cnhubertlarge as the encoder

• download model at chinese-hubert-large-fairseq-ckpt.pt
  • Place it under the pretrain directory

5. If dphubert as the encoder

• download model at DPHuBERT-sp0.75.pth
  • Place it under the pretrain directory

6. If WavLM is used as the encoder

• download model at WavLM-Base+.pt, the model fits wavlmbase+
  • Place it under the pretrain directory

List of Encoders

• "vec768l12"
• "vec256l9"
• "hubertsoft"
• "whisper-ppg"
• "cnhubertlarge"
• "dphubert"
• "whisper-ppg-large"
• "wavlmbase+"

Optional(Strongly recommend)

• Pre-trained model files: G_0.pth D_0.pth

  • Place them under the logs/44k directory

• Diffusion model pretraining base model file: model_0.pt

  • Put it in the logs/44k/diffusion directory

Get Glow-SVC Pre-trained models from this repository or anywhere else.

Diffusion model references Diffusion-SVC diffusion model. The pre-trained diffusion model is universal with the DDSP-SVC's. You can go to Diffusion-SVC's repo to get the pre-trained diffusion model.

While the pretrained model typically does not pose copyright concerns, it is essential to remain vigilant. It is advisable to consult with the author beforehand or carefully review the description to ascertain the permissible usage of the model. This helps ensure compliance with any specified guidelines or restrictions regarding its utilization.

Optional(Select as Required)

RMVPE

If you are using the rmvpe F0 Predictor, you will need to download the pre-trained RMVPE model.

• download model at rmvpe.pt
  • Place it under the pretrain directory

📊 Dataset Preparation

Simply place the dataset in the dataset_raw directory with the following file structure:

dataset_raw
├───speaker0
│   ├───xxx1-xxx1.wav
│   ├───...
│   └───Lxx-0xx8.wav
└───speaker1
    ├───xx2-0xxx2.wav
    ├───...
    └───xxx7-xxx007.wav

There are no specific restrictions on the format of the name for each audio file (naming conventions such as 000001.wav to 999999.wav are also valid), but the file type must be `WAV``.

You can customize the speaker's name as showed below:

dataset_raw
└───suijiSUI
    ├───1.wav
    ├───...
    └───25788785-20221210-200143-856_01_(Vocals)_0_0.wav

🛠️ Preprocessing

0. Slice audio

To avoid video memory overflow during training or pre-processing, it is recommended to limit the length of audio clips. Cutting the audio to a length of "5s - 15s" is more recommended. Slightly longer times are acceptable, however, excessively long clips may cause problems such as torch.cuda.OutOfMemoryError.

To facilitate the slicing process, you can use audio-slicer-GUI or audio-slicer-CLI

In general, only the Minimum Interval needs to be adjusted. For spoken audio, the default value usually suffices, while for singing audio, it can be adjusted to around 100 or even 50, depending on the specific requirements.

After slicing, it is recommended to remove any audio clips that are excessively long or too short.

If you are using whisper-ppg encoder for training, the audio clips must shorter than 30s.

1. Resample to 44100Hz and mono

python resample.py

Cautions

Although this project has resample.py scripts for resampling, mono and loudness matching, the default loudness matching is to match to 0db. This can cause damage to the sound quality. While python's loudness matching package pyloudnorm does not limit the level, this can lead to sonic boom. Therefore, it is recommended to consider using professional sound processing software, such as adobe audition for loudness matching. If you are already using other software for loudness matching, add the parameter -skip_loudnorm to the run command:

python resample.py --skip_loudnorm

2. Automatically split the dataset into training and validation sets, and generate configuration files.

python preprocess_flist_config.py --speech_encoder vec768l12

speech_encoder has the following options

vec768l12
vec256l9
hubertsoft
whisper-ppg
cnhubertlarge
dphubert
whisper-ppg-large
wavlmbase+

If the speech_encoder argument is omitted, the default value is vec768l12

Use loudness embedding

Add --vol_aug if you want to enable loudness embedding:

python preprocess_flist_config.py --speech_encoder vec768l12 --vol_aug

After enabling loudness embedding, the trained model will match the loudness of the input source; otherwise, it will match the loudness of the training set.

You can modify some parameters in the generated config.json and diffusion.yaml

• keep_ckpts: Keep the the the number of previous models during training. Set to 0 to keep them all. Default is 3.

• all_in_mem: Load all dataset to RAM. It can be enabled when the disk IO of some platforms is too low and the system memory is much larger than your dataset.

• batch_size: The amount of data loaded to the GPU for a single training session can be adjusted to a size lower than the GPU memory capacity.

• vocoder_name: Select a vocoder. The default is nsf-hifigan.

diffusion.yaml

• cache_all_data: Load all dataset to RAM. It can be enabled when the disk IO of some platforms is too low and the system memory is much larger than your dataset.

• duration: The duration of the audio slicing during training, can be adjusted according to the size of the video memory, Note: this value must be less than the minimum time of the audio in the training set!

• batch_size: The amount of data loaded to the GPU for a single training session can be adjusted to a size lower than the video memory capacity.

• timesteps: The total number of steps in the diffusion model, which defaults to 1000.

• k_step_max: Training can only train k_step_max step diffusion to save training time, note that the value must be less than timesteps, 0 is to train the entire diffusion model, Note: if you do not train the entire diffusion model will not be able to use only_diffusion!

3. Generate hubert and f0

python preprocess_hubert_f0.py --f0_predictor dio

f0_predictor has the following options

crepe
dio
pm
harvest
rmvpe

If the training set is too noisy,it is recommended to use crepe to handle f0

If the f0_predictor parameter is omitted, the default value is dio

If you want shallow diffusion (optional), you need to add the --use_diff parameter, for example:

python preprocess_hubert_f0.py --f0_predictor dio --use_diff

After completing the above steps, the dataset directory will contain the preprocessed data, and the dataset_raw folder can be deleted.

🏋️‍ Training

Glow-SVC Model

python train.py -c configs/config.json -m 44k

Diffusion Model (optional)

If the shallow diffusion function is needed, the diffusion model needs to be trained. The diffusion model training method is as follows:

python train_diff.py -c configs/diffusion.yaml

During training, the model files will be saved to logs/44k, and the diffusion model will be saved to logs/44k/diffusion

🤖 Inference

Use inference_main.py

# Example
python inference_main.py -m "logs/44k/G_30400.pth" -c "configs/config.json" -n "君の知らない物語-src.wav" -t 0 -s "nen"

Required parameters:

• -m | --model_path: path to the model.
• -c | --config_path: path to the configuration file.
• -n | --clean_names: a list of wav file names located in the raw folder.
• -t | --trans: pitch shift, supports positive and negative (semitone) values.
• -s | --spk_list: Select the speaker ID to use for conversion.
• -cl | --clip: Forced audio clipping, set to 0 to disable(default), setting it to a non-zero value (duration in seconds) to enable.

Optional parameters: see the next section

• -lg | --linear_gradient: The cross fade length of two audio slices in seconds. If there is a discontinuous voice after forced slicing, you can adjust this value. Otherwise, it is recommended to use the default value of 0.
• -f0p | --f0_predictor: Select a F0 predictor, options are crepe, pm, dio, harvest, rmvpe, default value is pm(note: f0 mean pooling will be enable when using crepe)
• -a | --auto_predict_f0: automatic pitch prediction, do not enable this when converting singing voices as it can cause serious pitch issues.
• -cm | --cluster_model_path: Cluster model or feature retrieval index path, if left blank, it will be automatically set as the default path of these models. If there is no training cluster or feature retrieval, fill in at will.
• -cr | --cluster_infer_ratio: The proportion of clustering scheme or feature retrieval ranges from 0 to 1. If there is no training clustering model or feature retrieval, the default is 0.
• -eh | --enhance: Whether to use NSF_HIFIGAN enhancer, this option has certain effect on sound quality enhancement for some models with few training sets, but has negative effect on well-trained models, so it is disabled by default.
• -shd | --shallow_diffusion: Whether to use shallow diffusion, which can solve some electrical sound problems after use. This option is disabled by default. When this option is enabled, NSF_HIFIGAN enhancer will be disabled
• -usm | --use_spk_mix: whether to use dynamic voice fusion
• -lea | --loudness_envelope_adjustment：The adjustment of the input source's loudness envelope in relation to the fusion ratio of the output loudness envelope. The closer to 1, the more the output loudness envelope is used
• -fr | --feature_retrieval：Whether to use feature retrieval If clustering model is used, it will be disabled, and cm and cr parameters will become the index path and mixing ratio of feature retrieval

Shallow diffusion settings:

• -dm | --diffusion_model_path: Diffusion model path
• -dc | --diffusion_config_path: Diffusion config file path
• -ks | --k_step: The larger the number of k_steps, the closer it is to the result of the diffusion model. The default is 100
• -od | --only_diffusion: Whether to use Only diffusion mode, which does not load the Glow-SVC model to only use diffusion model inference
• -se | --second_encoding：which involves applying an additional encoding to the original audio before shallow diffusion. This option can yield varying results - sometimes positive and sometimes negative.

Cautions

If inferencing using whisper-ppg speech encoder, you need to set --clip to 25 and -lg to 1. Otherwise it will fail to infer properly.

🤔 Optional Settings

If you are satisfied with the previous results, or if you do not feel you understand what follows, you can skip it and it will have no effect on the use of the model. The impact of these optional settings mentioned is relatively small, and while they may have some impact on specific datasets, in most cases the difference may not be significant.

Automatic f0 prediction

During the training of the 4.0 model, an f0 predictor is also trained, which enables automatic pitch prediction during voice conversion. However, if the results are not satisfactory, manual pitch prediction can be used instead. Please note that when converting singing voices, it is advised not to enable this feature as it may cause significant pitch shifting.

• Set auto_predict_f0 to true in inference_main.py.

Cluster-based timbre leakage control

Introduction: The clustering scheme implemented in this model aims to reduce timbre leakage and enhance the similarity of the trained model to the target's timbre, although the effect may not be very pronounced. However, relying solely on clustering can reduce the model's clarity and make it sound less distinct. Therefore, a fusion method is adopted in this model to control the balance between the clustering and non-clustering approaches. This allows manual adjustment of the trade-off between "sounding like the target's timbre" and "have clear enunciation" to find an optimal balance.

No changes are required in the existing steps. Simply train an additional clustering model, which incurs relatively low training costs.

• Training process:
  • Train on a machine with good CPU performance. According to extant experience, it takes about 4 minutes to train each speaker on a Tencent Cloud machine with 6-core CPU.
  • Execute python cluster/train_cluster.py. The output model will be saved in logs/44k/kmeans_10000.pt.
  • The clustering model can currently be trained using the gpu by executing python cluster/train_cluster.py --gpu
• Inference process:
  • Specify cluster_model_path in inference_main.py. If not specified, the default is logs/44k/kmeans_10000.pt.
  • Specify cluster_infer_ratio in inference_main.py, where 0 means not using clustering at all, 1 means only using clustering, and usually 0.5 is sufficient.

Feature retrieval

Introduction: As with the clustering scheme, the timbre leakage can be reduced, the enunciation is slightly better than clustering, but it will reduce the inference speed. By employing the fusion method, it becomes possible to linearly control the balance between feature retrieval and non-feature retrieval, allowing for fine-tuning of the desired proportion.

• Training process: First, it needs to be executed after generating hubert and f0:

python train_index.py -c configs/config.json

The output of the model will be in logs/44k/feature_and_index.pkl

• Inference process:
  • The --feature_retrieval needs to be formulated first, and the clustering mode automatically switches to the feature retrieval mode.
  • Specify cluster_model_path in inference_main.py. If not specified, the default is logs/44k/feature_and_index.pkl.
  • Specify cluster_infer_ratio in inference_main.py, where 0 means not using feature retrieval at all, 1 means only using feature retrieval, and usually 0.5 is sufficient.

🗜️ Model compression

The generated model contains data that is needed for further training. If you confirm that the model is final and not be used in further training, it is safe to remove these data to get smaller file size (about 1/3).

# Example
python compress_model.py -c="configs/config.json" -i="logs/44k/G_30400.pth" -o="logs/44k/release.pth"

👨‍🔧 Timbre mixing

Static Tone Mixing

Refer to webUI.py file for stable Timbre mixing of the gadget/lab feature.

Introduction: This function can combine multiple models into one model (convex combination or linear combination of multiple model parameters) to create mixed voice that do not exist in reality

Note:

1. This feature is only supported for single-speaker models
2. If you force a multi-speaker model, it is critical to make sure there are the same number of speakers in each model. This will ensure that sounds with the same SpeakerID can be mixed correctly.
3. Ensure that the model fields in config.json of all models to be mixed are the same
4. The mixed model can use any config.json file from the models being synthesized. However, the clustering model will not be functional after mixed.
5. When batch uploading models, it is best to put the models into a folder and upload them together after selecting them
6. It is suggested to adjust the mixing ratio between 0 and 100, or to other numbers, but unknown effects will occur in the linear combination mode
7. After mixing, the file named output.pth will be saved in the root directory of the project
8. Convex combination mode will perform Softmax to add the mix ratio to 1, while linear combination mode will not

Dynamic timbre mixing

Refer to the spkmix.py file for an introduction to dynamic timbre mixing

Character mix track writing rules:

Role ID: [[Start time 1, end time 1, start value 1, start value 1], [Start time 2, end time 2, start value 2]]

The start time must be the same as the end time of the previous one. The first start time must be 0, and the last end time must be 1 (time ranges from 0 to 1).

All roles must be filled in. For unused roles, fill [[0., 1., 0., 0.]]

The fusion value can be filled in arbitrarily, and the linear change from the start value to the end value within the specified period of time. The

internal linear combination will be automatically guaranteed to be 1 (convex combination condition), so it can be used safely

Use the --use_spk_mix parameter when reasoning to enable dynamic timbre mixing

📤 Exporting to Onnx

Use onnx_export.py

• Create a folder named checkpoints and open it
• Create a folder in the checkpoints folder as your project folder, naming it after your project, for example aziplayer
• Rename your model as model.pth, the configuration file as config.json, and place them in the aziplayer folder you just created
• Modify "NyaruTaffy" in path = "NyaruTaffy" in onnx_export.py to your project name, path = "aziplayer"（onnx_export_speaker_mix makes you can mix speaker's voice）
• Run onnx_export.py
• Wait for it to finish running. A model.onnx will be generated in your project folder, which is the exported model.

Note: For Hubert Onnx models, please use the models provided by MoeSS. Currently, they cannot be exported on their own (Hubert in fairseq has many unsupported operators and things involving constants that can cause errors or result in problems with the input/output shape and results when exported.)

📎 Reference

URL	Designation	Title	Implementation Source
2106.06103	VITS (Synthesizer)	Conditional Variational Autoencoder with Adversarial Learning for End-to-End Text-to-Speech	jaywalnut310/vits
2111.02392	SoftVC (Speech Encoder)	A Comparison of Discrete and Soft Speech Units for Improved Voice Conversion	bshall/hubert
2204.09224	ContentVec (Speech Encoder)	ContentVec: An Improved Self-Supervised Speech Representation by Disentangling Speakers	auspicious3000/contentvec
2212.04356	Whisper (Speech Encoder)	Robust Speech Recognition via Large-Scale Weak Supervision	openai/whisper
2110.13900	WavLM (Speech Encoder)	WavLM: Large-Scale Self-Supervised Pre-Training for Full Stack Speech Processing	microsoft/unilm/wavlm
2305.17651	DPHubert (Speech Encoder)	DPHuBERT: Joint Distillation and Pruning of Self-Supervised Speech Models	pyf98/DPHuBERT
DOI:10.21437/Interspeech.2017-68	Harvest (F0 Predictor)	Harvest: A high-performance fundamental frequency estimator from speech signals	mmorise/World/harvest
aes35-000039	Dio (F0 Predictor)	Fast and reliable F0 estimation method based on the period extraction of vocal fold vibration of singing voice and speech	mmorise/World/dio
8461329	Crepe (F0 Predictor)	Crepe: A Convolutional Representation for Pitch Estimation	maxrmorrison/torchcrepe
DOI:10.1016/j.wocn.2018.07.001	Parselmouth (F0 Predictor)	Introducing Parselmouth: A Python interface to Praat	YannickJadoul/Parselmouth
2306.15412v2	RMVPE (F0 Predictor)	RMVPE: A Robust Model for Vocal Pitch Estimation in Polyphonic Music	Dream-High/RMVPE
2010.05646	HIFIGAN (Vocoder)	HiFi-GAN: Generative Adversarial Networks for Efficient and High Fidelity Speech Synthesis	jik876/hifi-gan
1810.11946	NSF (Vocoder)	Neural source-filter-based waveform model for statistical parametric speech synthesis	openvpi/DiffSinger/modules/nsf_hifigan
2006.08195	Snake (Vocoder)	Neural Networks Fail to Learn Periodic Functions and How to Fix It	EdwardDixon/snake
2105.02446v3	Shallow Diffusion (PostProcessing)	DiffSinger: Singing Voice Synthesis via Shallow Diffusion Mechanism	CNChTu/Diffusion-SVC
K-means	Feature K-means Clustering (PreProcessing)	Some methods for classification and analysis of multivariate observations	This repo
	Feature TopK Retrieval (PreProcessing)	Retrieval based Voice Conversion	RVC-Project/Retrieval-based-Voice-Conversion-WebUI

📚 Some legal provisions for reference

Any country, region, organization, or individual using this project must comply with the following laws.

《民法典》

第一千零一十九条

任何组织或者个人不得以丑化、污损，或者利用信息技术手段伪造等方式侵害他人的肖像权。未经肖像权人同意，不得制作、使用、公开肖像权人的肖像，但是法律另有规定的除外。未经肖像权人同意，肖像作品权利人不得以发表、复制、发行、出租、展览等方式使用或者公开肖像权人的肖像。对自然人声音的保护，参照适用肖像权保护的有关规定。

第一千零二十四条

【名誉权】民事主体享有名誉权。任何组织或者个人不得以侮辱、诽谤等方式侵害他人的名誉权。

第一千零二十七条

【作品侵害名誉权】行为人发表的文学、艺术作品以真人真事或者特定人为描述对象，含有侮辱、诽谤内容，侵害他人名誉权的，受害人有权依法请求该行为人承担民事责任。行为人发表的文学、艺术作品不以特定人为描述对象，仅其中的情节与该特定人的情况相似的，不承担民事责任。

《中华人民共和国宪法》

《中华人民共和国刑法》

《中华人民共和国民法典》

《中华人民共和国合同法》

💪 Thanks to all contributors for their efforts