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0a1874461a
Rename the UNPOSITIONED flag to the DEFAULT_POSITIONS flag because that is really what the resulting GstAudioInfo will contain as the chanel mappings.
743 lines
25 KiB
C
743 lines
25 KiB
C
/* GStreamer
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* Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org>
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*
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* gstchannelmix.c: setup of channel conversion matrices
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <math.h>
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#include <string.h>
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#include <gst/audio/multichannel.h>
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#include "gstchannelmix.h"
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/*
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* Channel matrix functions.
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*/
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void
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gst_channel_mix_unset_matrix (AudioConvertCtx * this)
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{
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gint i;
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/* don't access if nothing there */
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if (!this->matrix)
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return;
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/* free */
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for (i = 0; i < this->in.channels; i++)
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g_free (this->matrix[i]);
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g_free (this->matrix);
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this->matrix = NULL;
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g_free (this->tmp);
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this->tmp = NULL;
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}
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/*
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* Detect and fill in identical channels. E.g.
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* forward the left/right front channels in a
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* 5.1 to 2.0 conversion.
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*/
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static void
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gst_channel_mix_fill_identical (AudioConvertCtx * this)
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{
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gint ci, co;
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/* Apart from the compatible channel assignments, we can also have
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* same channel assignments. This is much simpler, we simply copy
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* the value from source to dest! */
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for (co = 0; co < this->out.channels; co++) {
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/* find a channel in input with same position */
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for (ci = 0; ci < this->in.channels; ci++) {
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if (this->in.position[ci] == this->out.position[co]) {
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this->matrix[ci][co] = 1.0;
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}
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}
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}
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}
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/*
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* Detect and fill in compatible channels. E.g.
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* forward left/right front to mono (or the other
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* way around) when going from 2.0 to 1.0.
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*/
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static void
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gst_channel_mix_fill_compatible (AudioConvertCtx * this)
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{
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/* Conversions from one-channel to compatible two-channel configs */
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struct
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{
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GstAudioChannelPosition pos1[2];
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GstAudioChannelPosition pos2[1];
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} conv[] = {
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/* front: mono <-> stereo */
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{ {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {
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GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}},
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/* front center: 2 <-> 1 */
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{ {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, {
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}},
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/* rear: 2 <-> 1 */
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{ {
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {
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GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}}, { {
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GST_AUDIO_CHANNEL_POSITION_INVALID}}
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};
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gint c;
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/* conversions from compatible (but not the same) channel schemes */
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for (c = 0; conv[c].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; c++) {
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gint pos1_0 = -1, pos1_1 = -1, pos1_2 = -1;
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gint pos2_0 = -1, pos2_1 = -1, pos2_2 = -1;
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gint n;
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for (n = 0; n < this->in.channels; n++) {
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if (this->in.position[n] == conv[c].pos1[0])
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pos1_0 = n;
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else if (this->in.position[n] == conv[c].pos1[1])
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pos1_1 = n;
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else if (this->in.position[n] == conv[c].pos2[0])
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pos1_2 = n;
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}
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for (n = 0; n < this->out.channels; n++) {
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if (this->out.position[n] == conv[c].pos1[0])
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pos2_0 = n;
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else if (this->out.position[n] == conv[c].pos1[1])
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pos2_1 = n;
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else if (this->out.position[n] == conv[c].pos2[0])
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pos2_2 = n;
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}
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/* The general idea here is to fill in channels from the same position
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* as good as possible. This means mixing left<->center and right<->center.
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*/
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/* left -> center */
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if (pos1_0 != -1 && pos1_2 == -1 && pos2_0 == -1 && pos2_2 != -1)
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this->matrix[pos1_0][pos2_2] = 1.0;
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else if (pos1_0 != -1 && pos1_2 != -1 && pos2_0 == -1 && pos2_2 != -1)
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this->matrix[pos1_0][pos2_2] = 0.5;
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else if (pos1_0 != -1 && pos1_2 == -1 && pos2_0 != -1 && pos2_2 != -1)
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this->matrix[pos1_0][pos2_2] = 1.0;
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/* right -> center */
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if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 == -1 && pos2_2 != -1)
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this->matrix[pos1_1][pos2_2] = 1.0;
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else if (pos1_1 != -1 && pos1_2 != -1 && pos2_1 == -1 && pos2_2 != -1)
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this->matrix[pos1_1][pos2_2] = 0.5;
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else if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 != -1 && pos2_2 != -1)
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this->matrix[pos1_1][pos2_2] = 1.0;
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/* center -> left */
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if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 == -1 && pos2_0 != -1)
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this->matrix[pos1_2][pos2_0] = 1.0;
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else if (pos1_2 != -1 && pos1_0 != -1 && pos2_2 == -1 && pos2_0 != -1)
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this->matrix[pos1_2][pos2_0] = 0.5;
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else if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 != -1 && pos2_0 != -1)
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this->matrix[pos1_2][pos2_0] = 1.0;
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/* center -> right */
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if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 == -1 && pos2_1 != -1)
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this->matrix[pos1_2][pos2_1] = 1.0;
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else if (pos1_2 != -1 && pos1_1 != -1 && pos2_2 == -1 && pos2_1 != -1)
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this->matrix[pos1_2][pos2_1] = 0.5;
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else if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 != -1 && pos2_1 != -1)
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this->matrix[pos1_2][pos2_1] = 1.0;
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}
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}
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/*
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* Detect and fill in channels not handled by the
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* above two, e.g. center to left/right front in
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* 5.1 to 2.0 (or the other way around).
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*
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* Unfortunately, limited to static conversions
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* for now.
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*/
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static void
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gst_channel_mix_detect_pos (GstAudioInfo * info,
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gint * f, gboolean * has_f,
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gint * c, gboolean * has_c, gint * r, gboolean * has_r,
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gint * s, gboolean * has_s, gint * b, gboolean * has_b)
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{
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gint n;
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for (n = 0; n < info->channels; n++) {
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switch (info->position[n]) {
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case GST_AUDIO_CHANNEL_POSITION_FRONT_MONO:
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f[1] = n;
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*has_f = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT:
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f[0] = n;
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*has_f = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT:
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f[2] = n;
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*has_f = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER:
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c[1] = n;
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*has_c = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER:
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c[0] = n;
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*has_c = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER:
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c[2] = n;
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*has_c = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_REAR_CENTER:
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r[1] = n;
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*has_r = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_REAR_LEFT:
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r[0] = n;
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*has_r = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT:
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r[2] = n;
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*has_r = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT:
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s[0] = n;
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*has_s = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT:
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s[2] = n;
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*has_s = TRUE;
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break;
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case GST_AUDIO_CHANNEL_POSITION_LFE:
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*has_b = TRUE;
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b[1] = n;
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break;
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default:
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break;
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}
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}
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}
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static void
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gst_channel_mix_fill_one_other (gfloat ** matrix,
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GstAudioInfo * from_info, gint * from_idx,
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GstAudioInfo * to_info, gint * to_idx, gfloat ratio)
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{
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/* src & dst have center => passthrough */
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if (from_idx[1] != -1 && to_idx[1] != -1) {
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matrix[from_idx[1]][to_idx[1]] = ratio;
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}
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/* src & dst have left => passthrough */
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if (from_idx[0] != -1 && to_idx[0] != -1) {
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matrix[from_idx[0]][to_idx[0]] = ratio;
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}
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/* src & dst have right => passthrough */
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if (from_idx[2] != -1 && to_idx[2] != -1) {
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matrix[from_idx[2]][to_idx[2]] = ratio;
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}
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/* src has left & dst has center => put into center */
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if (from_idx[0] != -1 && to_idx[1] != -1 && from_idx[1] != -1) {
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matrix[from_idx[0]][to_idx[1]] = 0.5 * ratio;
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} else if (from_idx[0] != -1 && to_idx[1] != -1 && from_idx[1] == -1) {
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matrix[from_idx[0]][to_idx[1]] = ratio;
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}
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/* src has right & dst has center => put into center */
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if (from_idx[2] != -1 && to_idx[1] != -1 && from_idx[1] != -1) {
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matrix[from_idx[2]][to_idx[1]] = 0.5 * ratio;
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} else if (from_idx[2] != -1 && to_idx[1] != -1 && from_idx[1] == -1) {
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matrix[from_idx[2]][to_idx[1]] = ratio;
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}
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/* src has center & dst has left => passthrough */
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if (from_idx[1] != -1 && to_idx[0] != -1 && from_idx[0] != -1) {
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matrix[from_idx[1]][to_idx[0]] = 0.5 * ratio;
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} else if (from_idx[1] != -1 && to_idx[0] != -1 && from_idx[0] == -1) {
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matrix[from_idx[1]][to_idx[0]] = ratio;
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}
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/* src has center & dst has right => passthrough */
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if (from_idx[1] != -1 && to_idx[2] != -1 && from_idx[2] != -1) {
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matrix[from_idx[1]][to_idx[2]] = 0.5 * ratio;
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} else if (from_idx[1] != -1 && to_idx[2] != -1 && from_idx[2] == -1) {
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matrix[from_idx[1]][to_idx[2]] = ratio;
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}
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}
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#define RATIO_CENTER_FRONT (1.0 / sqrt (2.0))
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#define RATIO_CENTER_SIDE (1.0 / 2.0)
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#define RATIO_CENTER_REAR (1.0 / sqrt (8.0))
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#define RATIO_FRONT_CENTER (1.0 / sqrt (2.0))
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#define RATIO_FRONT_SIDE (1.0 / sqrt (2.0))
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#define RATIO_FRONT_REAR (1.0 / 2.0)
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#define RATIO_SIDE_CENTER (1.0 / 2.0)
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#define RATIO_SIDE_FRONT (1.0 / sqrt (2.0))
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#define RATIO_SIDE_REAR (1.0 / sqrt (2.0))
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#define RATIO_CENTER_BASS (1.0 / sqrt (2.0))
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#define RATIO_FRONT_BASS (1.0)
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#define RATIO_SIDE_BASS (1.0 / sqrt (2.0))
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#define RATIO_REAR_BASS (1.0 / sqrt (2.0))
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static void
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gst_channel_mix_fill_others (AudioConvertCtx * this)
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{
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gboolean in_has_front = FALSE, out_has_front = FALSE,
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in_has_center = FALSE, out_has_center = FALSE,
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in_has_rear = FALSE, out_has_rear = FALSE,
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in_has_side = FALSE, out_has_side = FALSE,
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in_has_bass = FALSE, out_has_bass = FALSE;
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/* LEFT, RIGHT, MONO */
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gint in_f[3] = { -1, -1, -1 };
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gint out_f[3] = { -1, -1, -1 };
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/* LOC, ROC, CENTER */
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gint in_c[3] = { -1, -1, -1 };
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gint out_c[3] = { -1, -1, -1 };
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/* RLEFT, RRIGHT, RCENTER */
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gint in_r[3] = { -1, -1, -1 };
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gint out_r[3] = { -1, -1, -1 };
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/* SLEFT, INVALID, SRIGHT */
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gint in_s[3] = { -1, -1, -1 };
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gint out_s[3] = { -1, -1, -1 };
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/* INVALID, LFE, INVALID */
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gint in_b[3] = { -1, -1, -1 };
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gint out_b[3] = { -1, -1, -1 };
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/* First see where (if at all) the various channels from/to
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* which we want to convert are located in our matrix/array. */
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gst_channel_mix_detect_pos (&this->in,
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in_f, &in_has_front,
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in_c, &in_has_center, in_r, &in_has_rear,
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in_s, &in_has_side, in_b, &in_has_bass);
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gst_channel_mix_detect_pos (&this->out,
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out_f, &out_has_front,
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out_c, &out_has_center, out_r, &out_has_rear,
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out_s, &out_has_side, out_b, &out_has_bass);
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/* The general idea here is:
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* - if the source has a channel that the destination doesn't have mix
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* it into the nearest available destination channel
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* - if the destination has a channel that the source doesn't have mix
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* the nearest source channel into the destination channel
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*
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* The ratio for the mixing becomes lower as the distance between the
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* channels gets larger
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*/
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/* center <-> front/side/rear */
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if (!in_has_center && in_has_front && out_has_center) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_f, &this->out, out_c, RATIO_CENTER_FRONT);
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} else if (!in_has_center && !in_has_front && in_has_side && out_has_center) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_s, &this->out, out_c, RATIO_CENTER_SIDE);
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} else if (!in_has_center && !in_has_front && !in_has_side && in_has_rear
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&& out_has_center) {
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gst_channel_mix_fill_one_other (this->matrix, &this->in, in_r, &this->out,
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out_c, RATIO_CENTER_REAR);
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} else if (in_has_center && !out_has_center && out_has_front) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_c, &this->out, out_f, RATIO_CENTER_FRONT);
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} else if (in_has_center && !out_has_center && !out_has_front && out_has_side) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_c, &this->out, out_s, RATIO_CENTER_SIDE);
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} else if (in_has_center && !out_has_center && !out_has_front && !out_has_side
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&& out_has_rear) {
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gst_channel_mix_fill_one_other (this->matrix, &this->in, in_c, &this->out,
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out_r, RATIO_CENTER_REAR);
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}
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/* front <-> center/side/rear */
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if (!in_has_front && in_has_center && !in_has_side && out_has_front) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_c, &this->out, out_f, RATIO_CENTER_FRONT);
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} else if (!in_has_front && !in_has_center && in_has_side && out_has_front) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_s, &this->out, out_f, RATIO_FRONT_SIDE);
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} else if (!in_has_front && in_has_center && in_has_side && out_has_front) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_c, &this->out, out_f, 0.5 * RATIO_CENTER_FRONT);
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_s, &this->out, out_f, 0.5 * RATIO_FRONT_SIDE);
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} else if (!in_has_front && !in_has_center && !in_has_side && in_has_rear
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&& out_has_front) {
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gst_channel_mix_fill_one_other (this->matrix, &this->in, in_r, &this->out,
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out_f, RATIO_FRONT_REAR);
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} else if (in_has_front && out_has_center && !out_has_side && !out_has_front) {
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gst_channel_mix_fill_one_other (this->matrix,
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&this->in, in_f, &this->out, out_c, RATIO_CENTER_FRONT);
|
|
} else if (in_has_front && !out_has_center && out_has_side && !out_has_front) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_f, &this->out, out_s, RATIO_FRONT_SIDE);
|
|
} else if (in_has_front && out_has_center && out_has_side && !out_has_front) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_f, &this->out, out_c, 0.5 * RATIO_CENTER_FRONT);
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_f, &this->out, out_s, 0.5 * RATIO_FRONT_SIDE);
|
|
} else if (in_has_front && !out_has_center && !out_has_side && !out_has_front
|
|
&& out_has_rear) {
|
|
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_f, &this->out,
|
|
out_r, RATIO_FRONT_REAR);
|
|
}
|
|
|
|
/* side <-> center/front/rear */
|
|
if (!in_has_side && in_has_front && !in_has_rear && out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_f, &this->out, out_s, RATIO_FRONT_SIDE);
|
|
} else if (!in_has_side && !in_has_front && in_has_rear && out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_r, &this->out, out_s, RATIO_SIDE_REAR);
|
|
} else if (!in_has_side && in_has_front && in_has_rear && out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_f, &this->out, out_s, 0.5 * RATIO_FRONT_SIDE);
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_r, &this->out, out_s, 0.5 * RATIO_SIDE_REAR);
|
|
} else if (!in_has_side && !in_has_front && !in_has_rear && in_has_center
|
|
&& out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_c, &this->out,
|
|
out_s, RATIO_CENTER_SIDE);
|
|
} else if (in_has_side && out_has_front && !out_has_rear && !out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_s, &this->out, out_f, RATIO_FRONT_SIDE);
|
|
} else if (in_has_side && !out_has_front && out_has_rear && !out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_s, &this->out, out_r, RATIO_SIDE_REAR);
|
|
} else if (in_has_side && out_has_front && out_has_rear && !out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_s, &this->out, out_f, 0.5 * RATIO_FRONT_SIDE);
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_s, &this->out, out_r, 0.5 * RATIO_SIDE_REAR);
|
|
} else if (in_has_side && !out_has_front && !out_has_rear && out_has_center
|
|
&& !out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_s, &this->out,
|
|
out_c, RATIO_CENTER_SIDE);
|
|
}
|
|
|
|
/* rear <-> center/front/side */
|
|
if (!in_has_rear && in_has_side && out_has_rear) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_s, &this->out, out_r, RATIO_SIDE_REAR);
|
|
} else if (!in_has_rear && !in_has_side && in_has_front && out_has_rear) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_f, &this->out, out_r, RATIO_FRONT_REAR);
|
|
} else if (!in_has_rear && !in_has_side && !in_has_front && in_has_center
|
|
&& out_has_rear) {
|
|
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_c, &this->out,
|
|
out_r, RATIO_CENTER_REAR);
|
|
} else if (in_has_rear && !out_has_rear && out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_r, &this->out, out_s, RATIO_SIDE_REAR);
|
|
} else if (in_has_rear && !out_has_rear && !out_has_side && out_has_front) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_r, &this->out, out_f, RATIO_FRONT_REAR);
|
|
} else if (in_has_rear && !out_has_rear && !out_has_side && !out_has_front
|
|
&& out_has_center) {
|
|
gst_channel_mix_fill_one_other (this->matrix, &this->in, in_r, &this->out,
|
|
out_c, RATIO_CENTER_REAR);
|
|
}
|
|
|
|
/* bass <-> any */
|
|
if (in_has_bass && !out_has_bass) {
|
|
if (out_has_center) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_b, &this->out, out_c, RATIO_CENTER_BASS);
|
|
}
|
|
if (out_has_front) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_b, &this->out, out_f, RATIO_FRONT_BASS);
|
|
}
|
|
if (out_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_b, &this->out, out_s, RATIO_SIDE_BASS);
|
|
}
|
|
if (out_has_rear) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_b, &this->out, out_r, RATIO_REAR_BASS);
|
|
}
|
|
} else if (!in_has_bass && out_has_bass) {
|
|
if (in_has_center) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_c, &this->out, out_b, RATIO_CENTER_BASS);
|
|
}
|
|
if (in_has_front) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_f, &this->out, out_b, RATIO_FRONT_BASS);
|
|
}
|
|
if (in_has_side) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_s, &this->out, out_b, RATIO_REAR_BASS);
|
|
}
|
|
if (in_has_rear) {
|
|
gst_channel_mix_fill_one_other (this->matrix,
|
|
&this->in, in_r, &this->out, out_b, RATIO_REAR_BASS);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Normalize output values.
|
|
*/
|
|
|
|
static void
|
|
gst_channel_mix_fill_normalize (AudioConvertCtx * this)
|
|
{
|
|
gfloat sum, top = 0;
|
|
gint i, j;
|
|
|
|
for (j = 0; j < this->out.channels; j++) {
|
|
/* calculate sum */
|
|
sum = 0.0;
|
|
for (i = 0; i < this->in.channels; i++) {
|
|
sum += fabs (this->matrix[i][j]);
|
|
}
|
|
if (sum > top) {
|
|
top = sum;
|
|
}
|
|
}
|
|
|
|
/* normalize to this */
|
|
if (top == 0.0)
|
|
return;
|
|
|
|
for (j = 0; j < this->out.channels; j++) {
|
|
for (i = 0; i < this->in.channels; i++) {
|
|
this->matrix[i][j] /= top;
|
|
}
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
gst_channel_mix_fill_special (AudioConvertCtx * this)
|
|
{
|
|
GstAudioInfo *in = &this->in, *out = &this->out;
|
|
|
|
/* Special, standard conversions here */
|
|
|
|
/* Mono<->Stereo, just a fast-path */
|
|
if (in->channels == 2 && out->channels == 1 &&
|
|
((in->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT &&
|
|
in->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) ||
|
|
(in->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT &&
|
|
in->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) &&
|
|
out->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_MONO) {
|
|
this->matrix[0][0] = 0.5;
|
|
this->matrix[1][0] = 0.5;
|
|
return TRUE;
|
|
} else if (in->channels == 1 && out->channels == 2 &&
|
|
((out->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT &&
|
|
out->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) ||
|
|
(out->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT &&
|
|
out->position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) &&
|
|
in->position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_MONO) {
|
|
this->matrix[0][0] = 1.0;
|
|
this->matrix[0][1] = 1.0;
|
|
return TRUE;
|
|
}
|
|
|
|
/* TODO: 5.1 <-> Stereo and other standard conversions */
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/*
|
|
* Automagically generate conversion matrix.
|
|
*/
|
|
|
|
static void
|
|
gst_channel_mix_fill_matrix (AudioConvertCtx * this)
|
|
{
|
|
if (gst_channel_mix_fill_special (this))
|
|
return;
|
|
|
|
gst_channel_mix_fill_identical (this);
|
|
|
|
if (!GST_AUDIO_INFO_HAS_DEFAULT_POSITIONS (&this->in)) {
|
|
gst_channel_mix_fill_compatible (this);
|
|
gst_channel_mix_fill_others (this);
|
|
gst_channel_mix_fill_normalize (this);
|
|
}
|
|
}
|
|
|
|
/* only call after this->out and this->in are filled in */
|
|
void
|
|
gst_channel_mix_setup_matrix (AudioConvertCtx * this)
|
|
{
|
|
gint i, j;
|
|
|
|
/* don't lose memory */
|
|
gst_channel_mix_unset_matrix (this);
|
|
|
|
/* temp storage */
|
|
if (GST_AUDIO_FORMAT_INFO_IS_INTEGER (this->in.finfo) ||
|
|
GST_AUDIO_FORMAT_INFO_IS_INTEGER (this->out.finfo)) {
|
|
this->tmp = (gpointer) g_new (gint32, this->out.channels);
|
|
} else {
|
|
this->tmp = (gpointer) g_new (gdouble, this->out.channels);
|
|
}
|
|
|
|
/* allocate */
|
|
this->matrix = g_new0 (gfloat *, this->in.channels);
|
|
for (i = 0; i < this->in.channels; i++) {
|
|
this->matrix[i] = g_new (gfloat, this->out.channels);
|
|
for (j = 0; j < this->out.channels; j++)
|
|
this->matrix[i][j] = 0.;
|
|
}
|
|
|
|
/* setup the matrix' internal values */
|
|
gst_channel_mix_fill_matrix (this);
|
|
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
|
/* debug */
|
|
{
|
|
GString *s;
|
|
s = g_string_new ("Matrix for");
|
|
g_string_append_printf (s, " %d -> %d: ",
|
|
this->in.channels, this->out.channels);
|
|
g_string_append (s, "{");
|
|
for (i = 0; i < this->in.channels; i++) {
|
|
if (i != 0)
|
|
g_string_append (s, ",");
|
|
g_string_append (s, " {");
|
|
for (j = 0; j < this->out.channels; j++) {
|
|
if (j != 0)
|
|
g_string_append (s, ",");
|
|
g_string_append_printf (s, " %f", this->matrix[i][j]);
|
|
}
|
|
g_string_append (s, " }");
|
|
}
|
|
g_string_append (s, " }");
|
|
GST_DEBUG ("%s", s->str);
|
|
g_string_free (s, TRUE);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
gboolean
|
|
gst_channel_mix_passthrough (AudioConvertCtx * this)
|
|
{
|
|
gint i;
|
|
|
|
/* only NxN matrices can be identities */
|
|
if (this->in.channels != this->out.channels)
|
|
return FALSE;
|
|
|
|
/* this assumes a normalized matrix */
|
|
for (i = 0; i < this->in.channels; i++)
|
|
if (this->matrix[i][i] != 1.)
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* IMPORTANT: out_data == in_data is possible, make sure to not overwrite data
|
|
* you might need later on! */
|
|
void
|
|
gst_channel_mix_mix_int (AudioConvertCtx * this,
|
|
gint32 * in_data, gint32 * out_data, gint samples)
|
|
{
|
|
gint in, out, n;
|
|
gint64 res;
|
|
gboolean backwards;
|
|
gint inchannels, outchannels;
|
|
gint32 *tmp = (gint32 *) this->tmp;
|
|
|
|
g_return_if_fail (this->matrix != NULL);
|
|
g_return_if_fail (this->tmp != NULL);
|
|
|
|
inchannels = this->in.channels;
|
|
outchannels = this->out.channels;
|
|
backwards = outchannels > inchannels;
|
|
|
|
/* FIXME: use liboil here? */
|
|
for (n = (backwards ? samples - 1 : 0); n < samples && n >= 0;
|
|
backwards ? n-- : n++) {
|
|
for (out = 0; out < outchannels; out++) {
|
|
/* convert */
|
|
res = 0;
|
|
for (in = 0; in < inchannels; in++) {
|
|
res += in_data[n * inchannels + in] * this->matrix[in][out];
|
|
}
|
|
|
|
/* clip (shouldn't we use doubles instead as intermediate format?) */
|
|
if (res < G_MININT32)
|
|
res = G_MININT32;
|
|
else if (res > G_MAXINT32)
|
|
res = G_MAXINT32;
|
|
tmp[out] = res;
|
|
}
|
|
memcpy (&out_data[n * outchannels], this->tmp,
|
|
sizeof (gint32) * outchannels);
|
|
}
|
|
}
|
|
|
|
void
|
|
gst_channel_mix_mix_float (AudioConvertCtx * this,
|
|
gdouble * in_data, gdouble * out_data, gint samples)
|
|
{
|
|
gint in, out, n;
|
|
gdouble res;
|
|
gboolean backwards;
|
|
gint inchannels, outchannels;
|
|
gdouble *tmp = (gdouble *) this->tmp;
|
|
|
|
g_return_if_fail (this->matrix != NULL);
|
|
g_return_if_fail (this->tmp != NULL);
|
|
|
|
inchannels = this->in.channels;
|
|
outchannels = this->out.channels;
|
|
backwards = outchannels > inchannels;
|
|
|
|
/* FIXME: use liboil here? */
|
|
for (n = (backwards ? samples - 1 : 0); n < samples && n >= 0;
|
|
backwards ? n-- : n++) {
|
|
for (out = 0; out < outchannels; out++) {
|
|
/* convert */
|
|
res = 0.0;
|
|
for (in = 0; in < inchannels; in++) {
|
|
res += in_data[n * inchannels + in] * this->matrix[in][out];
|
|
}
|
|
|
|
/* clip (shouldn't we use doubles instead as intermediate format?) */
|
|
if (res < -1.0)
|
|
res = -1.0;
|
|
else if (res > 1.0)
|
|
res = 1.0;
|
|
tmp[out] = res;
|
|
}
|
|
memcpy (&out_data[n * outchannels], this->tmp,
|
|
sizeof (gdouble) * outchannels);
|
|
}
|
|
}
|