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# src/pcm_resample.h

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    00001 /*
    00002  * Copyright (C) 2003-2010 The Music Player Daemon Project
    00003  * http://www.musicpd.org
    00004  *
    00005  * This program is free software; you can redistribute it and/or modify
    00006  * it under the terms of the GNU General Public License as published by
    00007  * the Free Software Foundation; either version 2 of the License, or
    00008  * (at your option) any later version.
    00009  *
    00010  * This program is distributed in the hope that it will be useful,
    00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013  * GNU General Public License for more details.
    00014  *
    00015  * You should have received a copy of the GNU General Public License along
    00016  * with this program; if not, write to the Free Software Foundation, Inc.,
    00017  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
    00018  */
    00019
    00020 #ifndef MPD_PCM_RESAMPLE_H
    00021 #define MPD_PCM_RESAMPLE_H
    00022
    00023 #include "check.h"
    00024 #include "pcm_buffer.h"
    00025
    00026 #include <stdint.h>
    00027 #include <stddef.h>
    00028 #include <stdbool.h>
    00029
    00030 #ifdef HAVE_LIBSAMPLERATE
    00031 #include <samplerate.h>
    00032 #endif
    00033
    00038 struct pcm_resample_state {
    00039 #ifdef HAVE_LIBSAMPLERATE
    00040         SRC_STATE *state;
    00041         SRC_DATA data;
    00042
    00043         struct pcm_buffer in, out;
    00044
    00045         struct {
    00046                 unsigned src_rate;
    00047                 unsigned dest_rate;
    00048                 uint8_t channels;
    00049         } prev;
    00050
    00051         int error;
    00052 #endif
    00053
    00054         struct pcm_buffer buffer;
    00055 };
    00056
    00060 void pcm_resample_init(struct pcm_resample_state *state);
    00061
    00066 void pcm_resample_deinit(struct pcm_resample_state *state);
    00067
    00080 const int16_t *
    00081 pcm_resample_16(struct pcm_resample_state *state,
    00082                 uint8_t channels,
    00083                 unsigned src_rate,
    00084                 const int16_t *src_buffer, size_t src_size,
    00085                 unsigned dest_rate, size_t *dest_size_r,
    00086                 GError **error_r);
    00087
    00100 const int32_t *
    00101 pcm_resample_32(struct pcm_resample_state *state,
    00102                 uint8_t channels,
    00103                 unsigned src_rate,
    00104                 const int32_t *src_buffer, size_t src_size,
    00105                 unsigned dest_rate, size_t *dest_size_r,
    00106                 GError **error_r);
    00107
    00120 static inline const int32_t *
    00121 pcm_resample_24(struct pcm_resample_state *state,
    00122                 uint8_t channels,
    00123                 unsigned src_rate,
    00124                 const int32_t *src_buffer, size_t src_size,
    00125                 unsigned dest_rate, size_t *dest_size_r,
    00126                 GError **error_r)
    00127 {
    00128         /* reuse the 32 bit code - the resampler code doesn't care if
    00129            the upper 8 bits are actually used */
    00130         return pcm_resample_32(state, channels,
    00131                                src_rate, src_buffer, src_size,
    00132                                dest_rate, dest_size_r, error_r);
    00133 }
    00134
    00135 #endif