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/*
* common functions for reordering audio channels
*
* Copyright (C) 2007 Ulion <ulion A gmail P com>
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <inttypes.h>
#include <string.h>
#include <assert.h>
#include "chmap.h"
#include "reorder_ch.h"
#define MAX_SAMPLESIZE 8
static void reorder_channels_(uint8_t *restrict data, int *restrict ch_order,
size_t sample_size, size_t num_ch,
size_t num_frames)
{
char buffer[MP_NUM_CHANNELS * MAX_SAMPLESIZE];
for (size_t f = 0; f < num_frames; f++) {
for (uint8_t c = 0; c < num_ch; c++) {
memcpy(buffer + sample_size * c, data + sample_size * ch_order[c],
sample_size);
}
memcpy(data, buffer, sample_size * num_ch);
data += num_ch * sample_size;
}
}
// Reorders for each channel:
// out[ch] = in[ch_order[ch]] (but in-place)
// num_ch is the number of channels
// sample_size is e.g. 2 for s16le
// full byte size of in/out = num_ch * sample_size * num_frames
// Do not use this function in new code; use libavresample instead.
void reorder_channels(void *restrict data, int *restrict ch_order,
size_t sample_size, size_t num_ch, size_t num_frames)
{
// Check 1:1 mapping
bool need_reorder = false;
for (int n = 0; n < num_ch; n++)
need_reorder |= ch_order[n] != n;
if (!need_reorder)
return;
assert(sample_size <= MAX_SAMPLESIZE);
assert(num_ch <= MP_NUM_CHANNELS);
// See reorder_to_planar() why this is done this way
// s16 and float are the most common sample sizes, and 6 channels is the
// most common case where reordering is required.
if (sample_size == 2 && num_ch == 6)
reorder_channels_(data, ch_order, 2, 6, num_frames);
else if (sample_size == 2)
reorder_channels_(data, ch_order, 2, num_ch, num_frames);
else if (sample_size == 4 && num_ch == 6)
reorder_channels_(data, ch_order, 4, 6, num_frames);
else if (sample_size == 4)
reorder_channels_(data, ch_order, 4, num_ch, num_frames);
else
reorder_channels_(data, ch_order, sample_size, num_ch, num_frames);
}
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