Adolfo Reyna
ef9d4e8de9
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Close and re-creating the codec on every page change caused an audible pop between pages. Now open_output_stream reuses an already-open stream when the format matches, the codec is left open on a natural page finish (only torn down on user stop / back / app close), and a short fade-in/out is applied at each page boundary. Also fixes pre-existing device API renames (device_find_* -> device_get_* out-param style). Docs: record where the Tactility SDK actually lives and that the fresh CDN 0.8.0-dev SDK is broken for this setup (app-module resolution), with the cached working copy workaround.
Tactility Book Player App
The Book Player app for Tactility OS plays children's books stored on the SD card. Each book is organized in its own subfolder and contains a sequential layout of pages with both visual illustrations (images) and narration (audio).
SD Card Layout
Books must be stored under /sdcard/books/ on the device SD card with the following structure:
/sdcard/books/
book_slug_1/
manifest.json
page001.png
page001.mp3
page002.png
page002.mp3
...
book_slug_2/
manifest.json
page001.jpg
page001.wav
page002.jpg
page002.wav
...
Manifest Format
Each book subfolder must contain a manifest.json file. Here is a sample format:
{
"title": "Princess Grace and Poppy",
"author": "Reyna Family",
"id": "grace-poppy",
"format": "tactility-book-manifest-v1",
"display": {
"width": 320,
"height": 240
},
"audio": {
"encoding": "mp3",
"sample_rate_hz": 16000,
"channels": 1,
"bitrate_kbps": 24
},
"pages": [
{
"image": "page001.png",
"audio": "page001.mp3",
"caption": "Once upon a time, in a magnificent castle perched high on a hill above the sea, there lived five princesses..."
},
{
"image": "page002.png",
"audio": "page002.mp3",
"caption": "This is the story of Princess Grace..."
}
]
}
Content Requirements
- Images: PNG or JPG format. Recommended size is
320×240pixels (or scaled to match standard aspect ratios). - Audio: Mono
MP3or uncompressed standardWAVfiles. For ESP32-S3 systems, lower sampling rates (e.g. 16 kHz mono) are recommended for memory efficiency.