78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/*
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* Copyright (C) 2003-2011 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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#include "pcm_pack.h"
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#include <glib.h>
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static void
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pack_sample(uint8_t *dest, const int32_t *src0)
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{
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const uint8_t *src = (const uint8_t *)src0;
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if (G_BYTE_ORDER == G_BIG_ENDIAN)
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++src;
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*dest++ = *src++;
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*dest++ = *src++;
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*dest++ = *src++;
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}
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void
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pcm_pack_24(uint8_t *dest, const int32_t *src, const int32_t *src_end)
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{
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/* duplicate loop to help the compiler's optimizer (constant
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parameter to the pack_sample() inline function) */
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while (src < src_end) {
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pack_sample(dest, src++);
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dest += 3;
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}
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}
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static void
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unpack_sample(int32_t *dest0, const uint8_t *src)
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{
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uint8_t *dest = (uint8_t *)dest0;
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if (G_BYTE_ORDER == G_BIG_ENDIAN)
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/* extend the sign bit to the most fourth byte */
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*dest++ = *src & 0x80 ? 0xff : 0x00;
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*dest++ = *src++;
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*dest++ = *src++;
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*dest++ = *src;
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if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
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/* extend the sign bit to the most fourth byte */
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*dest++ = *src & 0x80 ? 0xff : 0x00;
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}
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void
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pcm_unpack_24(int32_t *dest, const uint8_t *src, const uint8_t *src_end)
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{
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/* duplicate loop to help the compiler's optimizer (constant
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parameter to the unpack_sample() inline function) */
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while (src < src_end) {
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unpack_sample(dest++, src);
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src += 3;
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}
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}
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