5b82ffc291
After we've been hit by Large File Support problems several times in the past week (which only occur on 32 bit platforms, which I don't have), this is yet another attempt to fix the issue.
136 lines
3.8 KiB
C
136 lines
3.8 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* 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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_PCM_RESAMPLE_H
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#define MPD_PCM_RESAMPLE_H
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#include "check.h"
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#include "pcm_buffer.h"
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#ifdef HAVE_LIBSAMPLERATE
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#include <samplerate.h>
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#endif
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/**
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* This object is statically allocated (within another struct), and
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* holds buffer allocations and the state for the resampler.
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*/
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struct pcm_resample_state {
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#ifdef HAVE_LIBSAMPLERATE
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SRC_STATE *state;
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SRC_DATA data;
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struct pcm_buffer in, out;
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struct {
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unsigned src_rate;
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unsigned dest_rate;
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uint8_t channels;
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} prev;
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int error;
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#endif
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struct pcm_buffer buffer;
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};
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/**
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* Initializes a pcm_resample_state object.
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*/
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void pcm_resample_init(struct pcm_resample_state *state);
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/**
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* Deinitializes a pcm_resample_state object and frees allocated
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* memory.
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*/
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void pcm_resample_deinit(struct pcm_resample_state *state);
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/**
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* Resamples 16 bit PCM data.
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*
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* @param state an initialized pcm_resample_state object
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* @param channels the number of channels
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* @param src_rate the source sample rate
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* @param src the source PCM buffer
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* @param src_size the size of #src in bytes
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* @param dest_rate the requested destination sample rate
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* @param dest_size_r returns the number of bytes of the destination buffer
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* @return the destination buffer
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*/
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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, size_t *dest_size_r,
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GError **error_r);
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/**
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* Resamples 32 bit PCM data.
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*
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* @param state an initialized pcm_resample_state object
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* @param channels the number of channels
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* @param src_rate the source sample rate
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* @param src the source PCM buffer
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* @param src_size the size of #src in bytes
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* @param dest_rate the requested destination sample rate
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* @param dest_size_r returns the number of bytes of the destination buffer
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* @return the destination buffer
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*/
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const int32_t *
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pcm_resample_32(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, size_t src_size,
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unsigned dest_rate, size_t *dest_size_r,
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GError **error_r);
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/**
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* Resamples 24 bit PCM data.
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*
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* @param state an initialized pcm_resample_state object
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* @param channels the number of channels
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* @param src_rate the source sample rate
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* @param src the source PCM buffer
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* @param src_size the size of #src in bytes
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* @param dest_rate the requested destination sample rate
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* @param dest_size_r returns the number of bytes of the destination buffer
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* @return the destination buffer
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*/
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static inline 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, size_t src_size,
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unsigned dest_rate, size_t *dest_size_r,
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GError **error_r)
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{
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/* reuse the 32 bit code - the resampler code doesn't care if
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the upper 8 bits are actually used */
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return pcm_resample_32(state, channels,
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src_rate, src_buffer, src_size,
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dest_rate, dest_size_r, error_r);
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}
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#endif
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