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import { localError } from './errors.js';
import { toUint8, isBytesLike, isPlainObject } from './util.js';
const EXT_FORMAT = {
wav: 'wav', wave: 'wav', mp3: 'mp3', pcm: 'pcm', raw: 'pcm', aac: 'aac', m4a: 'm4a', mp4: 'm4a',
ogg: 'ogg', opus: 'ogg', amr: 'amr', webm: 'webm', flac: 'flac',
};
const CONTENT_TYPE = {
wav: 'audio/wav', mp3: 'audio/mpeg', aac: 'audio/aac', m4a: 'audio/mp4', ogg: 'audio/ogg',
amr: 'audio/amr', webm: 'audio/webm', flac: 'audio/flac',
};
const IMAGE_TYPE = { jpg: 'image/jpeg', png: 'image/png', gif: 'image/gif', webp: 'image/webp', bmp: 'image/bmp' };
function ascii(b, off, len) {
let s = '';
for (let i = off; i < off + len && i < b.length; i++) s += String.fromCharCode(b[i]);
return s;
}
function u16(b, off) {
return b[off] | (b[off + 1] << 8);
}
function u32(b, off) {
return (b[off] | (b[off + 1] << 8) | (b[off + 2] << 16) | (b[off + 3] << 24)) >>> 0;
}
/** Container format from magic bytes, or null when the bytes are not recognised (raw PCM included). */
export function detectFormat(b) {
if (b.length >= 12 && ascii(b, 0, 4) === 'RIFF' && ascii(b, 8, 4) === 'WAVE') return 'wav';
if (b.length >= 3 && ascii(b, 0, 3) === 'ID3') return 'mp3';
if (b.length >= 4 && ascii(b, 0, 4) === 'OggS') return 'ogg';
if (b.length >= 4 && ascii(b, 0, 4) === 'fLaC') return 'flac';
if (b.length >= 5 && ascii(b, 0, 5) === '#!AMR') return 'amr';
if (b.length >= 8 && ascii(b, 4, 4) === 'ftyp') return 'm4a';
if (b.length >= 4 && b[0] === 0x1a && b[1] === 0x45 && b[2] === 0xdf && b[3] === 0xa3) return 'webm';
if (b.length >= 2 && b[0] === 0xff && (b[1] & 0xf6) === 0xf0) return 'aac';
if (b.length >= 2 && b[0] === 0xff && (b[1] & 0xe0) === 0xe0) return 'mp3';
return null;
}
export function formatFromPath(path) {
const m = /\.([a-z0-9]+)(?:[?#].*)?$/i.exec(String(path || ''));
return m ? EXT_FORMAT[m[1].toLowerCase()] || null : null;
}
/**
* Parses the RIFF chunks of a WAV file. Returns null when the bytes are not RIFF WAVE, or
* {ok, audioFormat, channels, sampleRate, bitsPerSample, blockAlign, dataOffset, dataLength}.
* ok is false when the fmt or data chunk is missing.
*/
export function parseWav(bytes) {
const b = toUint8(bytes);
if (!b || b.length < 12 || ascii(b, 0, 4) !== 'RIFF' || ascii(b, 8, 4) !== 'WAVE') return null;
let off = 12;
let fmt = null;
let data = null;
while (off + 8 <= b.length) {
const id = ascii(b, off, 4);
const size = u32(b, off + 4);
const body = off + 8;
if (id === 'fmt ' && size >= 16 && body + 16 <= b.length) {
fmt = {
audioFormat: u16(b, body),
channels: u16(b, body + 2),
sampleRate: u32(b, body + 4),
blockAlign: u16(b, body + 12),
bitsPerSample: u16(b, body + 14),
};
// WAVE_FORMAT_EXTENSIBLE: the real format tag starts the SubFormat GUID.
if (fmt.audioFormat === 0xfffe && size >= 40 && body + 26 <= b.length) fmt.audioFormat = u16(b, body + 24);
} else if (id === 'data') {
const avail = b.length - body;
data = { offset: body, length: size === 0 || size === 0xffffffff ? avail : Math.min(size, avail) };
break;
}
off = body + size + (size & 1);
}
if (!fmt || !data) {
return { ok: false, audioFormat: fmt ? fmt.audioFormat : 0, channels: fmt ? fmt.channels : 0,
sampleRate: fmt ? fmt.sampleRate : 0, bitsPerSample: fmt ? fmt.bitsPerSample : 0, blockAlign: 0,
dataOffset: data ? data.offset : 0, dataLength: data ? data.length : 0 };
}
return {
ok: true,
audioFormat: fmt.audioFormat,
channels: fmt.channels,
sampleRate: fmt.sampleRate,
bitsPerSample: fmt.bitsPerSample,
blockAlign: fmt.blockAlign,
dataOffset: data.offset,
dataLength: data.length,
};
}
/** Wraps raw little-endian PCM in a 44 byte WAV header. */
export function pcmToWav(pcm, sampleRate, channels, bitsPerSample) {
const data = toUint8(pcm);
const sr = sampleRate || 16000;
const ch = channels || 1;
const bits = bitsPerSample || 16;
const blockAlign = ch * (bits / 8);
const out = new Uint8Array(44 + data.length);
const dv = new DataView(out.buffer);
const tag = (off, s) => {
for (let i = 0; i < 4; i++) out[off + i] = s.charCodeAt(i);
};
tag(0, 'RIFF');
dv.setUint32(4, 36 + data.length, true);
tag(8, 'WAVE');
tag(12, 'fmt ');
dv.setUint32(16, 16, true);
dv.setUint16(20, 1, true);
dv.setUint16(22, ch, true);
dv.setUint32(24, sr, true);
dv.setUint32(28, sr * blockAlign, true);
dv.setUint16(32, blockAlign, true);
dv.setUint16(34, bits, true);
tag(36, 'data');
dv.setUint32(40, data.length, true);
out.set(data, 44);
return out;
}
/** Reads a local file (tempFilePath, wxfile:// or user data path) through wx.getFileSystemManager(). */
export function readFile(wxApi, filePath) {
return new Promise((resolve, reject) => {
let fsm;
try {
fsm = wxApi.getFileSystemManager();
} catch (e) {
reject(localError(90010, 'wx.getFileSystemManager is not available', { cause: e }));
return;
}
fsm.readFile({
filePath,
success: (res) => {
const u8 = toUint8(res && res.data);
if (u8) resolve(u8);
else reject(localError(90010, 'readFile returned no binary data for ' + filePath));
},
fail: (err) => {
reject(localError(90010, 'cannot read file ' + filePath + ': ' + ((err && err.errMsg) || 'unknown error'), { cause: err }));
},
});
});
}
function describe(input) {
if (typeof input === 'string') return { path: input };
if (isBytesLike(input)) return { data: input };
if (isPlainObject(input)) {
return {
data: input.data,
path: input.tempFilePath || input.filePath || input.path,
format: input.format,
sampleRate: input.sampleRate,
numberOfChannels: input.numberOfChannels,
};
}
return null;
}
async function loadBytes(input, wxApi, what) {
const d = describe(input);
if (!d) throw localError(90010, what + ' must be an ArrayBuffer, a typed array, a tempFilePath or {tempFilePath}');
let bytes;
if (d.data !== undefined && d.data !== null) {
bytes = toUint8(d.data);
if (!bytes) throw localError(90010, what + '.data must be an ArrayBuffer or a typed array');
} else if (typeof d.path === 'string' && d.path) {
bytes = await readFile(wxApi, d.path);
} else {
throw localError(90010, what + ' is required');
}
if (bytes.length === 0) throw localError(90010, what + ' is empty');
return { bytes, d };
}
/**
* Loads caller audio into bytes ready for the `audio` part.
* hints: {format, sampleRate, numberOfChannels}. Raw PCM (format "pcm", a .pcm path or a recording
* result of the SDK recorder) is wrapped in a WAV header, 16000 Hz mono 16 bit unless told otherwise.
* Returns {bytes, format, sourceFormat, filename, contentType, wav}.
*/
export async function loadAudio(input, wxApi, hints) {
const h = hints || {};
const loaded = await loadBytes(input, wxApi, 'audio');
const d = loaded.d;
let bytes = loaded.bytes;
const hint = String(h.format || d.format || '').toLowerCase() || null;
const detected = detectFormat(bytes);
let format = detected;
if (!format && hint) format = EXT_FORMAT[hint] || hint;
if (!format && d.path) format = formatFromPath(d.path);
if (hint === 'pcm' && detected !== 'wav') format = 'pcm';
if (!format) format = 'unknown';
const sourceFormat = format;
if (format === 'pcm') {
bytes = pcmToWav(bytes, h.sampleRate || d.sampleRate || 16000, h.numberOfChannels || d.numberOfChannels || 1, 16);
format = 'wav';
}
return {
bytes,
format,
sourceFormat,
filename: 'audio.' + (format === 'unknown' ? 'bin' : format),
contentType: CONTENT_TYPE[format] || 'application/octet-stream',
wav: format === 'wav' ? parseWav(bytes) : null,
};
}
/** Loads the optional picture of open questions (coreType open, taskType picture). */
export async function loadImage(input, wxApi) {
const loaded = await loadBytes(input, wxApi, 'image');
const b = loaded.bytes;
let ext = 'bin';
if (b.length >= 3 && b[0] === 0xff && b[1] === 0xd8 && b[2] === 0xff) ext = 'jpg';
else if (b.length >= 4 && b[0] === 0x89 && ascii(b, 1, 3) === 'PNG') ext = 'png';
else if (b.length >= 4 && ascii(b, 0, 4) === 'GIF8') ext = 'gif';
else if (b.length >= 12 && ascii(b, 0, 4) === 'RIFF' && ascii(b, 8, 4) === 'WEBP') ext = 'webp';
else if (b.length >= 2 && ascii(b, 0, 2) === 'BM') ext = 'bmp';
return { bytes: b, filename: 'image.' + ext, contentType: IMAGE_TYPE[ext] || 'application/octet-stream' };
}
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