🎵 Sol-Aud(io)

Sol-Aud(io) is a proof-of-concept Solana dApp that uploads and plays back on-chain audio — one chunked transaction at a time.
It uses a Pinocchio program and a Rust CLI for uploading and playback.

⚠️ Disclaimer This project is a proof of concept (POC) meant to demonstrate the feasibility of on-chain audio storage and playback on Solana. It is not optimized for production use . There are far more efficient approaches, for examle using Audio compression before chunking. For the best results during testing, try using short audio clips (up to ~10 seconds) to keep upload and playback smooth. Expect slower performance and higher transaction counts for longer files. Please take in consideration RPC limits when uploading and fetching a file.

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Architecture

Component	Description
sol-record/	Solana on-chain program (Pinocchio). Stores audio chunks in PDA accounts.
sol-record-player/	CLI client to upload (upload) or play (play) audio. Uses Symphonia for decoding and Rodio for playback.

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Uploading Audio

1. Build the CLI:

   cargo build -p sol-record-player --release

2. Run upload (replace values accordingly):

RUST_LOG=info ./target/release/sol-record-player upload \
  --input ./sound.wav \
  --name "My First Track" \
  --keypair ./keypair.json \
  --rpc-url "https://devnet.YOUR_RPC.com/?api-key=YOUR_KEY" \
  --max-chunk 750

This will:

• Decode your audio to raw PCM.
• Split it into 750-byte aligned chunks.
• Upload each chunk as a Solana transaction.
• Derive a deterministic PDA for the track.

3. Playing Audio

Once uploaded, you can fetch and play a record directly from its PDA.

PDA key of a record uploaded: FnGWo9cs4ZXZ5gpvEBj38Tyd5tihuCn5ehYvzT1JsjRK

./target/release/sol-record-player play \
  --pda 2d15eQs9j9JVgDQYWFGg91CH28KxBrrpwxNXqTH4pQTd \
  --rpc-url "https://devnet.helius-rpc.com/?api-key=fc421f09-346e-447f-92e6-045a45a55301"

The CLI will:

• Stream chunk transactions from chain.
• Reassemble and verify by audio_id.
• Start playback once the buffer is ready.

Notes

• Uploads are sequential to preserve order.
• Each transaction stores exactly one chunk in the PDA.