mirror of
https://github.com/mpv-player/mpv
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78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
/*
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* common functions for reordering audio channels
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*
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* Copyright (C) 2007 Ulion <ulion A gmail P com>
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*
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* This file is part of MPlayer.
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*
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* MPlayer 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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* MPlayer 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 MPlayer; 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 <inttypes.h>
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#include <string.h>
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#include <assert.h>
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#include "chmap.h"
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#include "reorder_ch.h"
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#define MAX_SAMPLESIZE 8
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static void reorder_channels_(uint8_t *restrict data, int *restrict ch_order,
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size_t sample_size, size_t num_ch,
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size_t num_frames)
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{
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char buffer[MP_NUM_CHANNELS * MAX_SAMPLESIZE];
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for (size_t f = 0; f < num_frames; f++) {
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for (uint8_t c = 0; c < num_ch; c++) {
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memcpy(buffer + sample_size * c, data + sample_size * ch_order[c],
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sample_size);
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}
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memcpy(data, buffer, sample_size * num_ch);
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data += num_ch * sample_size;
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}
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}
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// Reorders for each channel:
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// out[ch] = in[ch_order[ch]] (but in-place)
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// num_ch is the number of channels
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// sample_size is e.g. 2 for s16le
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// full byte size of in/out = num_ch * sample_size * num_frames
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// Do not use this function in new code; use libavresample instead.
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void reorder_channels(void *restrict data, int *restrict ch_order,
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size_t sample_size, size_t num_ch, size_t num_frames)
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{
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// Check 1:1 mapping
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bool need_reorder = false;
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for (int n = 0; n < num_ch; n++)
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need_reorder |= ch_order[n] != n;
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if (!need_reorder)
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return;
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assert(sample_size <= MAX_SAMPLESIZE);
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assert(num_ch <= MP_NUM_CHANNELS);
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// See reorder_to_planar() why this is done this way
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// s16 and float are the most common sample sizes, and 6 channels is the
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// most common case where reordering is required.
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if (sample_size == 2 && num_ch == 6)
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reorder_channels_(data, ch_order, 2, 6, num_frames);
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else if (sample_size == 2)
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reorder_channels_(data, ch_order, 2, num_ch, num_frames);
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else if (sample_size == 4 && num_ch == 6)
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reorder_channels_(data, ch_order, 4, 6, num_frames);
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else if (sample_size == 4)
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reorder_channels_(data, ch_order, 4, num_ch, num_frames);
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else
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reorder_channels_(data, ch_order, sample_size, num_ch, num_frames);
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}
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