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Merged
shubhammalhotra28 merged 4 commits into from
Feb 6, 2026
Merged

Testing #333

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8caec34
Optimise resampling and heap thrashing
VyasGuru Feb 5, 2026
2bea5e4
Merge branch 'testing' of https://github.com/VyasGuru/runanywhere-sdk…
VyasGuru Feb 5, 2026
f901cf0
improved even more for integer ratios
VyasGuru Feb 5, 2026
3367adb
Update whispercpp_backend.cpp
VyasGuru Feb 5, 2026
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78 changes: 63 additions & 15 deletions sdk/runanywhere-commons/src/backends/whispercpp/whispercpp_backend.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -274,35 +274,41 @@ STTResult WhisperCppSTT::transcribe_internal(const std::vector<float>& audio,

const int n_segments = whisper_full_n_segments(ctx_);
std::string full_text;
full_text.reserve(n_segments * 64);

result.segments.reserve(n_segments);

if (word_timestamps) {
result.word_timings.reserve(n_segments * 15);
}

for (int i = 0; i < n_segments; ++i) {
const char* text = whisper_full_get_segment_text(ctx_, i);
if (text) {
full_text += text;

AudioSegment segment;
result.segments.emplace_back();
AudioSegment& segment = result.segments.back();
segment.text = text;
segment.start_time_ms = whisper_full_get_segment_t0(ctx_, i) * 10.0;
segment.end_time_ms = whisper_full_get_segment_t1(ctx_, i) * 10.0;

float no_speech_prob = whisper_full_get_segment_no_speech_prob(ctx_, i);
segment.confidence = 1.0f - no_speech_prob;

result.segments.push_back(segment);

if (word_timestamps) {
const int n_tokens = whisper_full_n_tokens(ctx_, i);
for (int j = 0; j < n_tokens; ++j) {
whisper_token_data token_data = whisper_full_get_token_data(ctx_, i, j);
const char* token_text = whisper_full_get_token_text(ctx_, i, j);

if (token_text && token_text[0] != '\0' && token_text[0] != '<') {
WordTiming word;
result.word_timings.emplace_back();
WordTiming& word = result.word_timings.back();
word.word = token_text;
word.start_time_ms = token_data.t0 * 10.0;
word.end_time_ms = token_data.t1 * 10.0;
word.confidence = token_data.p;
result.word_timings.push_back(word);
}
}
}
Expand Down Expand Up @@ -547,22 +553,64 @@ std::vector<std::string> WhisperCppSTT::get_supported_languages() const {

std::vector<float> WhisperCppSTT::resample_to_16khz(const std::vector<float>& samples,
int source_rate) {
if (source_rate == WHISPER_SAMPLE_RATE) {
if (source_rate == WHISPER_SAMPLE_RATE || samples.empty()) {
return samples;
}

const double ratio = static_cast<double>(WHISPER_SAMPLE_RATE) / source_rate;
const size_t output_size = static_cast<size_t>(samples.size() * ratio);
const double step = static_cast<double>(source_rate) / WHISPER_SAMPLE_RATE;

size_t output_size = static_cast<size_t>(samples.size() / step);
if (output_size == 0) {
output_size = 1;
}

std::vector<float> output;

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Blank line with trailing whitespace after declaration

Suggested change
std::vector<float> output;

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

Prompt To Fix With AI 
This is a comment left during a code review.
Path: sdk/runanywhere-commons/src/backends/whispercpp/whispercpp_backend.cpp
Line: 564:564

Comment:
Blank line with trailing whitespace after declaration

```suggestion
    std::vector<float> output;
```

<sub>Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!</sub>

How can I resolve this? If you propose a fix, please make it concise.

if (source_rate % WHISPER_SAMPLE_RATE == 0) {
const int stride = source_rate / WHISPER_SAMPLE_RATE;
const size_t out_len = std::max<size_t>(1, samples.size() / stride);

output.resize(out_len);
for (size_t i = 0; i < out_len; ++i) {
output[i] = samples[i * stride];
}
return output;
}

output.resize(output_size);

const float* __restrict src_ptr = samples.data();
const size_t src_size = samples.size();

const size_t safe_output_limit = (output_size > 0) ? output_size - 1 : 0;

double pos = 0.0;
size_t i = 0;

for (; i < safe_output_limit; ++i) {
size_t idx0 = static_cast<size_t>(pos);
if (idx0 >= src_size - 1) break;

double frac = pos - idx0;
float val0 = src_ptr[idx0];
float val1 = src_ptr[idx0 + 1];

output[i] = val0 + static_cast<float>(frac) * (val1 - val0);
pos += step;
}

for (; i < output_size; ++i) {
size_t idx0 = static_cast<size_t>(pos);
if (idx0 >= src_size) idx0 = src_size - 1;

std::vector<float> output(output_size);
size_t idx1 = (idx0 + 1 < src_size) ? idx0 + 1 : src_size - 1;

for (size_t i = 0; i < output_size; ++i) {
const double src_idx = i / ratio;
const size_t idx0 = static_cast<size_t>(src_idx);
const size_t idx1 = std::min(idx0 + 1, samples.size() - 1);
const double frac = src_idx - idx0;
double frac = pos - static_cast<double>(idx0);
float val0 = src_ptr[idx0];
float val1 = src_ptr[idx1];

output[i] = static_cast<float>(samples[idx0] * (1.0 - frac) + samples[idx1] * frac);
output[i] = val0 + static_cast<float>(frac) * (val1 - val0);
pos += step;
}

LOGI("Resampled audio from %d Hz to %d Hz (%zu -> %zu samples)", source_rate,
Expand Down
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