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Make FLAC encoder bit depth depend on input sample format, add sampleFormat audio transformation option, fix incorrect bitrate validation for FLAC (closes #357)

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This commit is contained in:
Vanilagy
2026-04-29 16:27:20 +02:00
parent 2d49122277
commit f3dec587fd
15 changed files with 384 additions and 143 deletions
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packages/flac-encoder/build/flac.js
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packages/flac-encoder/src/bridge.c
+9 -16
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@@ -12,7 +12,6 @@
#include <stdlib.h>
#include <string.h>
#define BITS_PER_SAMPLE 16
#define COMPRESSION_LEVEL 5
typedef struct {
@@ -23,14 +22,10 @@ typedef struct {
typedef struct {
FLAC__StreamEncoder *encoder;
// Input buffer for interleaved int16 samples from JS
int16_t *input_buffer;
// Input buffer for interleaved int32 samples from JS
FLAC__int32 *input_buffer;
int input_buffer_size;
// Widened to int32 for libFLAC
FLAC__int32 *int32_buffer;
int int32_buffer_size;
// Contiguous output buffer for encoded frame data
uint8_t *output_buffer;
int output_size;
@@ -48,6 +43,7 @@ typedef struct {
bool header_done;
int channels;
int bits_per_sample;
} EncoderContext;
static void ensure_output_capacity(EncoderContext *ctx, int needed) {
@@ -120,13 +116,14 @@ static void reset_output(EncoderContext *ctx) {
}
EMSCRIPTEN_KEEPALIVE
int init_encoder(int channels, int sample_rate) {
int init_encoder(int channels, int sample_rate, int bits_per_sample) {
EncoderContext *ctx = calloc(1, sizeof(EncoderContext));
if (!ctx) {
return 0;
}
ctx->channels = channels;
ctx->bits_per_sample = bits_per_sample;
ctx->encoder = FLAC__stream_encoder_new();
if (!ctx->encoder) {
@@ -136,7 +133,7 @@ int init_encoder(int channels, int sample_rate) {
FLAC__stream_encoder_set_channels(ctx->encoder, channels);
FLAC__stream_encoder_set_sample_rate(ctx->encoder, sample_rate);
FLAC__stream_encoder_set_bits_per_sample(ctx->encoder, BITS_PER_SAMPLE);
FLAC__stream_encoder_set_bits_per_sample(ctx->encoder, bits_per_sample);
FLAC__stream_encoder_set_compression_level(ctx->encoder, COMPRESSION_LEVEL);
FLAC__stream_encoder_set_verify(ctx->encoder, false);
@@ -174,19 +171,15 @@ EMSCRIPTEN_KEEPALIVE
int send_samples(int ctx_ptr, int num_samples) {
EncoderContext *ctx = (EncoderContext *)ctx_ptr;
// Widen int16 to int32 for libFLAC
int total = num_samples * ctx->channels;
if (total > ctx->int32_buffer_size) {
ctx->int32_buffer = realloc(ctx->int32_buffer, total * sizeof(FLAC__int32));
ctx->int32_buffer_size = total;
}
int shift = 32 - ctx->bits_per_sample;
for (int i = 0; i < total; i++) {
ctx->int32_buffer[i] = ctx->input_buffer[i];
ctx->input_buffer[i] >>= shift;
}
reset_output(ctx);
FLAC__bool ok = FLAC__stream_encoder_process_interleaved(ctx->encoder, ctx->int32_buffer, num_samples);
FLAC__bool ok = FLAC__stream_encoder_process_interleaved(ctx->encoder, ctx->input_buffer, num_samples);
return ok ? 0 : -1;
}
packages/flac-encoder/src/encode.worker.ts
+5 -4
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@@ -16,7 +16,7 @@ type ExtendedEmscriptenModule = EmscriptenModule & {
let module: ExtendedEmscriptenModule;
let modulePromise: Promise<ExtendedEmscriptenModule> | null = null;
let initEncoderFn: (channels: number, sampleRate: number) => number;
let initEncoderFn: (channels: number, sampleRate: number, bitsPerSample: number) => number;
let getEncodeInputPtr: (ctx: number, size: number) => number;
let sendSamplesFn: (ctx: number, numSamples: number) => number;
let getOutputData: (ctx: number) => number;
@@ -37,7 +37,7 @@ const ensureModule = async () => {
module = await modulePromise;
modulePromise = null;
initEncoderFn = module.cwrap('init_encoder', 'number', ['number', 'number']);
initEncoderFn = module.cwrap('init_encoder', 'number', ['number', 'number', 'number']);
getEncodeInputPtr = module.cwrap('get_encode_input_ptr', 'number', ['number', 'number']);
sendSamplesFn = module.cwrap('send_samples', 'number', ['number', 'number']);
getOutputData = module.cwrap('get_output_data', 'number', ['number']);
@@ -50,10 +50,10 @@ const ensureModule = async () => {
}
};
const initEncoder = async (numberOfChannels: number, sampleRate: number) => {
const initEncoder = async (numberOfChannels: number, sampleRate: number, bitsPerSample: 16 | 24) => {
await ensureModule();
const ctx = initEncoderFn(numberOfChannels, sampleRate);
const ctx = initEncoderFn(numberOfChannels, sampleRate, bitsPerSample);
if (ctx === 0) {
throw new Error('Failed to initialize FLAC encoder.');
}
@@ -121,6 +121,7 @@ const onMessage = (data: { id: number; command: WorkerCommand }) => {
const { ctx, header } = await initEncoder(
command.data.numberOfChannels,
command.data.sampleRate,
command.data.bitsPerSample,
);
result = { type: command.type, ctx, header };
transferables.push(header);
packages/flac-encoder/src/encoder.ts
+49 -18
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@@ -29,7 +29,7 @@ class FlacEncoder extends CustomAudioEncoder {
reject: (reason?: unknown) => void;
}>();
private ctx = 0;
private ctx: number | null = null;
private chunkMetadata: EncodedAudioChunkMetadata = {};
private description: Uint8Array | null = null;
private nextTimestampInSamples: number | null = null;
@@ -65,19 +65,6 @@ class FlacEncoder extends CustomAudioEncoder {
};
nodeWorker.on('message', onMessage);
}
const result = await this.sendCommand({
type: 'init',
data: {
numberOfChannels: this.config.numberOfChannels,
sampleRate: this.config.sampleRate,
},
});
this.ctx = result.ctx;
this.description = new Uint8Array(result.header);
this.resetInternalState();
}
private resetInternalState() {
@@ -94,15 +81,50 @@ class FlacEncoder extends CustomAudioEncoder {
}
async encode(audioSample: AudioSample) {
if (this.ctx === null) {
// This is the first sample, let's do some init
let bitsPerSample: 16 | 24;
switch (audioSample.format) {
case 'u8':
case 'u8-planar':
case 's16':
case 's16-planar':
bitsPerSample = 16;
break;
case 's32':
case 's32-planar':
case 'f32':
case 'f32-planar':
bitsPerSample = 24;
break;
default:
assertNever(audioSample.format);
assert(false);
}
const result = await this.sendCommand({
type: 'init',
data: {
numberOfChannels: this.config.numberOfChannels,
sampleRate: this.config.sampleRate,
bitsPerSample,
},
});
this.ctx = result.ctx;
this.description = new Uint8Array(result.header);
this.resetInternalState();
}
if (this.nextTimestampInSamples === null) {
this.nextTimestampInSamples = Math.round(audioSample.timestamp * this.config.sampleRate);
}
const totalBytes = audioSample.allocationSize({ format: 's16', planeIndex: 0 });
const audioBytes = new Uint8Array(totalBytes);
audioSample.copyTo(audioBytes, { format: 's16', planeIndex: 0 });
const totalBytes = audioSample.allocationSize({ format: 's32', planeIndex: 0 });
const audioData = new ArrayBuffer(totalBytes);
audioSample.copyTo(audioData, { format: 's32', planeIndex: 0 });
const audioData = audioBytes.buffer;
const result = await this.sendCommand({
type: 'encode',
data: {
@@ -116,6 +138,10 @@ class FlacEncoder extends CustomAudioEncoder {
}
async flush() {
if (this.ctx === null) {
return;
}
const result = await this.sendCommand({ type: 'flush', data: { ctx: this.ctx } });
this.emitPackets(result.packets);
@@ -198,3 +224,8 @@ function assert(x: unknown): asserts x {
throw new Error('Assertion failed.');
}
}
export const assertNever = (x: never) => {
// eslint-disable-next-line @typescript-eslint/restrict-template-expressions
throw new Error(`Unexpected value: ${x}`);
};
packages/flac-encoder/src/shared.ts
+1
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@@ -16,6 +16,7 @@ export type WorkerCommand = {
data: {
numberOfChannels: number;
sampleRate: number;
bitsPerSample: 16 | 24;
};
} | {
type: 'encode';