953b258e5e
Due to rounding errors, it was possible that the fallback resampler returned partial frames.
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* Copyright (C) 2008 Max Kellermann <max@duempel.org>
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "pcm_resample.h"
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#include <assert.h>
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#include <glib.h>
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void pcm_resample_deinit(struct pcm_resample_state *state)
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{
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pcm_buffer_deinit(&state->buffer);
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}
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/* resampling code blatantly ripped from ESD */
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const int16_t *
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pcm_resample_16(struct pcm_resample_state *state,
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uint8_t channels,
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unsigned src_rate,
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const int16_t *src_buffer, size_t src_size,
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unsigned dest_rate,
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size_t *dest_size_r)
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{
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unsigned src_pos, dest_pos = 0;
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unsigned src_frames = src_size / channels / sizeof(*src_buffer);
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unsigned dest_frames =
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(src_frames * dest_rate + src_rate - 1) / src_rate;
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unsigned dest_samples = dest_frames * channels;
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size_t dest_size = dest_samples * sizeof(*src_buffer);
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int16_t *dest_buffer = pcm_buffer_get(&state->buffer, dest_size);
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assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
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switch (channels) {
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case 1:
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while (dest_pos < dest_samples) {
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src_pos = dest_pos * src_rate / dest_rate;
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dest_buffer[dest_pos++] = src_buffer[src_pos];
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}
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break;
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case 2:
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while (dest_pos < dest_samples) {
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src_pos = dest_pos * src_rate / dest_rate;
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src_pos &= ~1;
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dest_buffer[dest_pos++] = src_buffer[src_pos];
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dest_buffer[dest_pos++] = src_buffer[src_pos + 1];
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}
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break;
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}
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*dest_size_r = dest_size;
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return dest_buffer;
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}
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const int32_t *
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pcm_resample_24(struct pcm_resample_state *state,
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uint8_t channels,
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unsigned src_rate,
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const int32_t *src_buffer, G_GNUC_UNUSED size_t src_size,
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unsigned dest_rate,
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size_t *dest_size_r)
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{
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unsigned src_pos, dest_pos = 0;
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unsigned src_frames = src_size / channels / sizeof(*src_buffer);
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unsigned dest_frames =
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(src_frames * dest_rate + src_rate - 1) / src_rate;
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unsigned dest_samples = dest_frames * channels;
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size_t dest_size = dest_samples * sizeof(*src_buffer);
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int32_t *dest_buffer = pcm_buffer_get(&state->buffer, dest_size);
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assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
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switch (channels) {
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case 1:
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while (dest_pos < dest_samples) {
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src_pos = dest_pos * src_rate / dest_rate;
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dest_buffer[dest_pos++] = src_buffer[src_pos];
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}
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break;
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case 2:
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while (dest_pos < dest_samples) {
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src_pos = dest_pos * src_rate / dest_rate;
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src_pos &= ~1;
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dest_buffer[dest_pos++] = src_buffer[src_pos];
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dest_buffer[dest_pos++] = src_buffer[src_pos + 1];
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}
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break;
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}
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*dest_size_r = dest_size;
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return dest_buffer;
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}
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