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- /*************************************************************************/
- /* audio_rb_resampler.h */
- /*************************************************************************/
- /* This file is part of: */
- /* GODOT ENGINE */
- /* https://godotengine.org */
- /*************************************************************************/
- /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */
- /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */
- /* */
- /* Permission is hereby granted, free of charge, to any person obtaining */
- /* a copy of this software and associated documentation files (the */
- /* "Software"), to deal in the Software without restriction, including */
- /* without limitation the rights to use, copy, modify, merge, publish, */
- /* distribute, sublicense, and/or sell copies of the Software, and to */
- /* permit persons to whom the Software is furnished to do so, subject to */
- /* the following conditions: */
- /* */
- /* The above copyright notice and this permission notice shall be */
- /* included in all copies or substantial portions of the Software. */
- /* */
- /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
- /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
- /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
- /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
- /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
- /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
- /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
- /*************************************************************************/
- #ifndef AUDIO_RB_RESAMPLER_H
- #define AUDIO_RB_RESAMPLER_H
- #include "os/memory.h"
- #include "servers/audio_server.h"
- #include "typedefs.h"
- struct AudioRBResampler {
- uint32_t rb_bits;
- uint32_t rb_len;
- uint32_t rb_mask;
- uint32_t read_buff_len;
- uint32_t channels;
- uint32_t src_mix_rate;
- uint32_t target_mix_rate;
- volatile int rb_read_pos;
- volatile int rb_write_pos;
- int32_t offset; //contains the fractional remainder of the resampler
- enum {
- MIX_FRAC_BITS = 13,
- MIX_FRAC_LEN = (1 << MIX_FRAC_BITS),
- MIX_FRAC_MASK = MIX_FRAC_LEN - 1,
- };
- float *read_buf;
- float *rb;
- template <int C>
- uint32_t _resample(AudioFrame *p_dest, int p_todo, int32_t p_increment);
- public:
- _FORCE_INLINE_ void flush() {
- rb_read_pos = 0;
- rb_write_pos = 0;
- offset = 0;
- }
- _FORCE_INLINE_ bool is_ready() const {
- return rb != NULL;
- }
- _FORCE_INLINE_ int get_total() const {
- return rb_len - 1;
- }
- _FORCE_INLINE_ int get_writer_space() const {
- int space, r, w;
- r = rb_read_pos;
- w = rb_write_pos;
- if (r == w) {
- space = rb_len - 1;
- } else if (w < r) {
- space = r - w - 1;
- } else {
- space = (rb_len - r) + w - 1;
- }
- return space;
- }
- _FORCE_INLINE_ int get_reader_space() const {
- int space, r, w;
- r = rb_read_pos;
- w = rb_write_pos;
- if (r == w) {
- space = 0;
- } else if (w < r) {
- space = rb_len - r + w;
- } else {
- space = w - r;
- }
- return space;
- }
- _FORCE_INLINE_ bool has_data() const {
- return rb && rb_read_pos != rb_write_pos;
- }
- _FORCE_INLINE_ float *get_write_buffer() { return read_buf; }
- _FORCE_INLINE_ void write(uint32_t p_frames) {
- ERR_FAIL_COND(p_frames >= rb_len);
- switch (channels) {
- case 1: {
- for (uint32_t i = 0; i < p_frames; i++) {
- rb[rb_write_pos] = read_buf[i];
- rb_write_pos = (rb_write_pos + 1) & rb_mask;
- }
- } break;
- case 2: {
- for (uint32_t i = 0; i < p_frames; i++) {
- rb[(rb_write_pos << 1) + 0] = read_buf[(i << 1) + 0];
- rb[(rb_write_pos << 1) + 1] = read_buf[(i << 1) + 1];
- rb_write_pos = (rb_write_pos + 1) & rb_mask;
- }
- } break;
- case 4: {
- for (uint32_t i = 0; i < p_frames; i++) {
- rb[(rb_write_pos << 2) + 0] = read_buf[(i << 2) + 0];
- rb[(rb_write_pos << 2) + 1] = read_buf[(i << 2) + 1];
- rb[(rb_write_pos << 2) + 2] = read_buf[(i << 2) + 2];
- rb[(rb_write_pos << 2) + 3] = read_buf[(i << 2) + 3];
- rb_write_pos = (rb_write_pos + 1) & rb_mask;
- }
- } break;
- case 6: {
- for (uint32_t i = 0; i < p_frames; i++) {
- rb[(rb_write_pos * 6) + 0] = read_buf[(i * 6) + 0];
- rb[(rb_write_pos * 6) + 1] = read_buf[(i * 6) + 1];
- rb[(rb_write_pos * 6) + 2] = read_buf[(i * 6) + 2];
- rb[(rb_write_pos * 6) + 3] = read_buf[(i * 6) + 3];
- rb[(rb_write_pos * 6) + 4] = read_buf[(i * 6) + 4];
- rb[(rb_write_pos * 6) + 5] = read_buf[(i * 6) + 5];
- rb_write_pos = (rb_write_pos + 1) & rb_mask;
- }
- } break;
- }
- }
- int get_channel_count() const;
- Error setup(int p_channels, int p_src_mix_rate, int p_target_mix_rate, int p_buffer_msec, int p_minbuff_needed = -1);
- void clear();
- bool mix(AudioFrame *p_dest, int p_frames);
- int get_num_of_ready_frames();
- AudioRBResampler();
- ~AudioRBResampler();
- };
- #endif // AUDIO_RB_RESAMPLER_H
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