mirror of
https://github.com/RetroDECK/Duckstation.git
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374 lines
13 KiB
C++
374 lines
13 KiB
C++
/*
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* Copyright © 2014 Mozilla Foundation
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*
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* This program is made available under an ISC-style license. See the
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* accompanying file LICENSE for details.
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*/
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif // NOMINMAX
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#include "cubeb_resampler.h"
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#include "cubeb-speex-resampler.h"
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#include "cubeb_resampler_internal.h"
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#include "cubeb_utils.h"
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#include <algorithm>
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#include <cassert>
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#include <cmath>
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#include <cstddef>
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#include <cstdio>
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#include <cstring>
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int
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to_speex_quality(cubeb_resampler_quality q)
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{
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switch (q) {
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case CUBEB_RESAMPLER_QUALITY_VOIP:
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return SPEEX_RESAMPLER_QUALITY_VOIP;
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case CUBEB_RESAMPLER_QUALITY_DEFAULT:
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return SPEEX_RESAMPLER_QUALITY_DEFAULT;
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case CUBEB_RESAMPLER_QUALITY_DESKTOP:
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return SPEEX_RESAMPLER_QUALITY_DESKTOP;
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default:
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assert(false);
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return 0XFFFFFFFF;
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}
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}
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uint32_t
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min_buffered_audio_frame(uint32_t sample_rate)
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{
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return sample_rate / 20;
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}
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template <typename T>
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passthrough_resampler<T>::passthrough_resampler(cubeb_stream * s,
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cubeb_data_callback cb,
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void * ptr,
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uint32_t input_channels,
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uint32_t sample_rate)
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: processor(input_channels), stream(s), data_callback(cb), user_ptr(ptr),
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sample_rate(sample_rate)
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{
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}
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template <typename T>
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long
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passthrough_resampler<T>::fill(void * input_buffer, long * input_frames_count,
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void * output_buffer, long output_frames)
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{
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if (input_buffer) {
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assert(input_frames_count);
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}
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assert((input_buffer && output_buffer) ||
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(output_buffer && !input_buffer &&
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(!input_frames_count || *input_frames_count == 0)) ||
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(input_buffer && !output_buffer && output_frames == 0));
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// When we have no pending input data and exactly as much input
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// as output data, we don't need to copy it into the internal buffer
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// and can directly forward it to the callback.
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void * in_buf = input_buffer;
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unsigned long pop_input_count = 0u;
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if (input_buffer && !output_buffer) {
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output_frames = *input_frames_count;
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} else if (input_buffer) {
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if (internal_input_buffer.length() != 0 ||
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*input_frames_count < output_frames) {
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// If we have pending input data left and have to first append the input
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// so we can pass it as one pointer to the callback. Or this is a glitch.
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// It can happen when system's performance is poor. Audible silence is
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// being pushed at the end of the short input buffer. An improvement for
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// the future is to resample to the output number of frames, when that
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// happens.
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internal_input_buffer.push(static_cast<T *>(input_buffer),
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frames_to_samples(*input_frames_count));
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if (internal_input_buffer.length() < frames_to_samples(output_frames)) {
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// This is unxpected but it can happen when a glitch occurs. Fill the
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// buffer with silence. First keep the actual number of input samples
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// used without the silence.
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pop_input_count = internal_input_buffer.length();
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internal_input_buffer.push_silence(frames_to_samples(output_frames) -
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internal_input_buffer.length());
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} else {
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pop_input_count = frames_to_samples(output_frames);
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}
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in_buf = internal_input_buffer.data();
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} else if (*input_frames_count > output_frames) {
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// In this case we have more input that we need output and
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// fill the overflowing input into internal_input_buffer
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// Since we have no other pending data, we can nonetheless
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// pass the current input data directly to the callback
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assert(pop_input_count == 0);
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unsigned long samples_off = frames_to_samples(output_frames);
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internal_input_buffer.push(
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static_cast<T *>(input_buffer) + samples_off,
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frames_to_samples(*input_frames_count - output_frames));
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}
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}
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long rv =
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data_callback(stream, user_ptr, in_buf, output_buffer, output_frames);
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if (input_buffer) {
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if (pop_input_count) {
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internal_input_buffer.pop(nullptr, pop_input_count);
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*input_frames_count = samples_to_frames(pop_input_count);
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} else {
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*input_frames_count = output_frames;
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}
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drop_audio_if_needed();
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}
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return rv;
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}
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// Explicit instantiation of template class.
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template class passthrough_resampler<float>;
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template class passthrough_resampler<short>;
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template <typename T, typename InputProcessor, typename OutputProcessor>
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cubeb_resampler_speex<T, InputProcessor, OutputProcessor>::
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cubeb_resampler_speex(InputProcessor * input_processor,
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OutputProcessor * output_processor, cubeb_stream * s,
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cubeb_data_callback cb, void * ptr)
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: input_processor(input_processor), output_processor(output_processor),
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stream(s), data_callback(cb), user_ptr(ptr)
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{
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if (input_processor && output_processor) {
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fill_internal = &cubeb_resampler_speex::fill_internal_duplex;
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} else if (input_processor) {
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fill_internal = &cubeb_resampler_speex::fill_internal_input;
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} else if (output_processor) {
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fill_internal = &cubeb_resampler_speex::fill_internal_output;
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}
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}
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template <typename T, typename InputProcessor, typename OutputProcessor>
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cubeb_resampler_speex<T, InputProcessor,
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OutputProcessor>::~cubeb_resampler_speex()
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{
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}
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template <typename T, typename InputProcessor, typename OutputProcessor>
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long
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cubeb_resampler_speex<T, InputProcessor, OutputProcessor>::fill(
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void * input_buffer, long * input_frames_count, void * output_buffer,
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long output_frames_needed)
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{
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/* Input and output buffers, typed */
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T * in_buffer = reinterpret_cast<T *>(input_buffer);
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T * out_buffer = reinterpret_cast<T *>(output_buffer);
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return (this->*fill_internal)(in_buffer, input_frames_count, out_buffer,
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output_frames_needed);
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}
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template <typename T, typename InputProcessor, typename OutputProcessor>
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long
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cubeb_resampler_speex<T, InputProcessor, OutputProcessor>::fill_internal_output(
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T * input_buffer, long * input_frames_count, T * output_buffer,
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long output_frames_needed)
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{
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assert(!input_buffer && (!input_frames_count || *input_frames_count == 0) &&
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output_buffer && output_frames_needed);
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if (!draining) {
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long got = 0;
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T * out_unprocessed = nullptr;
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long output_frames_before_processing = 0;
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/* fill directly the input buffer of the output processor to save a copy */
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output_frames_before_processing =
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output_processor->input_needed_for_output(output_frames_needed);
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out_unprocessed =
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output_processor->input_buffer(output_frames_before_processing);
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got = data_callback(stream, user_ptr, nullptr, out_unprocessed,
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output_frames_before_processing);
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if (got < output_frames_before_processing) {
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draining = true;
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if (got < 0) {
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return got;
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}
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}
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output_processor->written(got);
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}
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/* Process the output. If not enough frames have been returned from the
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* callback, drain the processors. */
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return output_processor->output(output_buffer, output_frames_needed);
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}
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template <typename T, typename InputProcessor, typename OutputProcessor>
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long
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cubeb_resampler_speex<T, InputProcessor, OutputProcessor>::fill_internal_input(
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T * input_buffer, long * input_frames_count, T * output_buffer,
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long /*output_frames_needed*/)
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{
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assert(input_buffer && input_frames_count && *input_frames_count &&
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!output_buffer);
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/* The input data, after eventual resampling. This is passed to the callback.
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*/
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T * resampled_input = nullptr;
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uint32_t resampled_frame_count =
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input_processor->output_for_input(*input_frames_count);
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/* process the input, and present exactly `output_frames_needed` in the
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* callback. */
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input_processor->input(input_buffer, *input_frames_count);
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/* resampled_frame_count == 0 happens if the resampler
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* doesn't have enough input frames buffered to produce 1 resampled frame. */
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if (resampled_frame_count == 0) {
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return *input_frames_count;
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}
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size_t frames_resampled = 0;
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resampled_input =
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input_processor->output(resampled_frame_count, &frames_resampled);
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*input_frames_count = frames_resampled;
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long got = data_callback(stream, user_ptr, resampled_input, nullptr,
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resampled_frame_count);
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/* Return the number of initial input frames or part of it.
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* Since output_frames_needed == 0 in input scenario, the only
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* available number outside resampler is the initial number of frames. */
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return (*input_frames_count) * (got / resampled_frame_count);
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}
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template <typename T, typename InputProcessor, typename OutputProcessor>
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long
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cubeb_resampler_speex<T, InputProcessor, OutputProcessor>::fill_internal_duplex(
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T * in_buffer, long * input_frames_count, T * out_buffer,
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long output_frames_needed)
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{
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if (draining) {
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// discard input and drain any signal remaining in the resampler.
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return output_processor->output(out_buffer, output_frames_needed);
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}
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/* The input data, after eventual resampling. This is passed to the callback.
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*/
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T * resampled_input = nullptr;
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/* The output buffer passed down in the callback, that might be resampled. */
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T * out_unprocessed = nullptr;
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long output_frames_before_processing = 0;
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/* The number of frames returned from the callback. */
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long got = 0;
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/* We need to determine how much frames to present to the consumer.
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* - If we have a two way stream, but we're only resampling input, we resample
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* the input to the number of output frames.
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* - If we have a two way stream, but we're only resampling the output, we
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* resize the input buffer of the output resampler to the number of input
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* frames, and we resample it afterwards.
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* - If we resample both ways, we resample the input to the number of frames
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* we would need to pass down to the consumer (before resampling the output),
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* get the output data, and resample it to the number of frames needed by the
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* caller. */
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output_frames_before_processing =
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output_processor->input_needed_for_output(output_frames_needed);
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/* fill directly the input buffer of the output processor to save a copy */
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out_unprocessed =
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output_processor->input_buffer(output_frames_before_processing);
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if (in_buffer) {
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/* process the input, and present exactly `output_frames_needed` in the
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* callback. */
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input_processor->input(in_buffer, *input_frames_count);
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size_t frames_resampled = 0;
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resampled_input = input_processor->output(output_frames_before_processing,
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&frames_resampled);
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*input_frames_count = frames_resampled;
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} else {
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resampled_input = nullptr;
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}
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got = data_callback(stream, user_ptr, resampled_input, out_unprocessed,
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output_frames_before_processing);
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if (got < output_frames_before_processing) {
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draining = true;
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if (got < 0) {
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return got;
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}
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}
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output_processor->written(got);
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input_processor->drop_audio_if_needed();
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/* Process the output. If not enough frames have been returned from the
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* callback, drain the processors. */
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got = output_processor->output(out_buffer, output_frames_needed);
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output_processor->drop_audio_if_needed();
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return got;
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}
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/* Resampler C API */
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cubeb_resampler *
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cubeb_resampler_create(cubeb_stream * stream,
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cubeb_stream_params * input_params,
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cubeb_stream_params * output_params,
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unsigned int target_rate, cubeb_data_callback callback,
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void * user_ptr, cubeb_resampler_quality quality,
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cubeb_resampler_reclock reclock)
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{
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cubeb_sample_format format;
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assert(input_params || output_params);
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if (input_params) {
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format = input_params->format;
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} else {
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format = output_params->format;
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}
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switch (format) {
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case CUBEB_SAMPLE_S16NE:
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return cubeb_resampler_create_internal<short>(
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stream, input_params, output_params, target_rate, callback, user_ptr,
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quality, reclock);
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case CUBEB_SAMPLE_FLOAT32NE:
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return cubeb_resampler_create_internal<float>(
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stream, input_params, output_params, target_rate, callback, user_ptr,
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quality, reclock);
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default:
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assert(false);
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return nullptr;
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}
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}
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long
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cubeb_resampler_fill(cubeb_resampler * resampler, void * input_buffer,
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long * input_frames_count, void * output_buffer,
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long output_frames_needed)
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{
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return resampler->fill(input_buffer, input_frames_count, output_buffer,
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output_frames_needed);
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}
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void
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cubeb_resampler_destroy(cubeb_resampler * resampler)
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{
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delete resampler;
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}
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long
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cubeb_resampler_latency(cubeb_resampler * resampler)
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{
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return resampler->latency();
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}
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