| 24 | } |
| 25 | |
| 26 | std::vector<float> resample_interleaved_to_rate( |
| 27 | const std::vector<float> & samples, |
| 28 | int source_rate, |
| 29 | int channels, |
| 30 | int target_rate) { |
| 31 | if (source_rate == target_rate) { |
| 32 | return samples; |
| 33 | } |
| 34 | const int64_t frames = static_cast<int64_t>(samples.size() / static_cast<size_t>(channels)); |
| 35 | std::vector<std::vector<float>> channel_outputs; |
| 36 | channel_outputs.reserve(static_cast<size_t>(channels)); |
| 37 | int64_t output_frames = -1; |
| 38 | for (int ch = 0; ch < channels; ++ch) { |
| 39 | std::vector<float> mono(static_cast<size_t>(frames), 0.0F); |
| 40 | for (int64_t frame = 0; frame < frames; ++frame) { |
| 41 | mono[static_cast<size_t>(frame)] = samples[static_cast<size_t>(frame * channels + ch)]; |
| 42 | } |
| 43 | SoxrResampleOptions options; |
| 44 | options.profile = SoxrResampleProfile::QualityOnly; |
| 45 | options.output_length_policy = SoxrOutputLengthPolicy::ExactExpected; |
| 46 | options.warning_context = "audio mix"; |
| 47 | options.fallback_description = "linear resampling"; |
| 48 | auto resampled = resample_mono_soxr_or_linear(mono, source_rate, target_rate, options); |
| 49 | if (output_frames < 0) { |
| 50 | output_frames = static_cast<int64_t>(resampled.size()); |
| 51 | } else if (output_frames != static_cast<int64_t>(resampled.size())) { |
| 52 | throw std::runtime_error("audio mix resampled channels produced inconsistent lengths"); |
| 53 | } |
| 54 | channel_outputs.push_back(std::move(resampled)); |
| 55 | } |
| 56 | std::vector<float> out(static_cast<size_t>(output_frames * channels), 0.0F); |
| 57 | for (int64_t frame = 0; frame < output_frames; ++frame) { |
| 58 | for (int ch = 0; ch < channels; ++ch) { |
| 59 | out[static_cast<size_t>(frame * channels + ch)] = channel_outputs[static_cast<size_t>(ch)][static_cast<size_t>(frame)]; |
| 60 | } |
| 61 | } |
| 62 | return out; |
| 63 | } |
| 64 | |
| 65 | std::vector<float> adapt_audio( |
| 66 | const WavData & input, |
no test coverage detected