diff options
Diffstat (limited to 'gst/audioconvert/gstchannelmix.c')
| -rw-r--r-- | gst/audioconvert/gstchannelmix.c | 742 |
1 files changed, 0 insertions, 742 deletions
diff --git a/gst/audioconvert/gstchannelmix.c b/gst/audioconvert/gstchannelmix.c deleted file mode 100644 index 055f28d7..00000000 --- a/gst/audioconvert/gstchannelmix.c +++ /dev/null @@ -1,742 +0,0 @@ -/* GStreamer - * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net> - * Copyright (C) 2008 Sebastian Dröge <slomo@circular-chaos.org> - * - * gstchannelmix.c: setup of channel conversion matrices - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library 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 - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -#ifdef HAVE_CONFIG_H -#include "config.h" -#endif - -#include <math.h> -#include <string.h> -#include <gst/audio/multichannel.h> - -#include "gstchannelmix.h" - -/* - * Channel matrix functions. - */ - -void -gst_channel_mix_unset_matrix (AudioConvertCtx * this) -{ - gint i; - - /* don't access if nothing there */ - if (!this->matrix) - return; - - /* free */ - for (i = 0; i < this->in.channels; i++) - g_free (this->matrix[i]); - g_free (this->matrix); - - this->matrix = NULL; - g_free (this->tmp); - this->tmp = NULL; -} - -/* - * Detect and fill in identical channels. E.g. - * forward the left/right front channels in a - * 5.1 to 2.0 conversion. - */ - -static void -gst_channel_mix_fill_identical (AudioConvertCtx * this) -{ - gint ci, co; - - /* Apart from the compatible channel assignments, we can also have - * same channel assignments. This is much simpler, we simply copy - * the value from source to dest! */ - for (co = 0; co < this->out.channels; co++) { - /* find a channel in input with same position */ - for (ci = 0; ci < this->in.channels; ci++) { - if (this->in.pos[ci] == this->out.pos[co]) { - this->matrix[ci][co] = 1.0; - } - } - } -} - -/* - * Detect and fill in compatible channels. E.g. - * forward left/right front to mono (or the other - * way around) when going from 2.0 to 1.0. - */ - -static void -gst_channel_mix_fill_compatible (AudioConvertCtx * this) -{ - /* Conversions from one-channel to compatible two-channel configs */ - struct - { - GstAudioChannelPosition pos1[2]; - GstAudioChannelPosition pos2[1]; - } conv[] = { - /* front: mono <-> stereo */ - { { - GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, - GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, { - GST_AUDIO_CHANNEL_POSITION_FRONT_MONO}}, - /* front center: 2 <-> 1 */ - { { - GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER, - GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER}, { - GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}}, - /* rear: 2 <-> 1 */ - { { - GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, - GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, { - GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}}, { { - GST_AUDIO_CHANNEL_POSITION_INVALID}} - }; - gint c; - - /* conversions from compatible (but not the same) channel schemes */ - for (c = 0; conv[c].pos1[0] != GST_AUDIO_CHANNEL_POSITION_INVALID; c++) { - gint pos1_0 = -1, pos1_1 = -1, pos1_2 = -1; - gint pos2_0 = -1, pos2_1 = -1, pos2_2 = -1; - gint n; - - for (n = 0; n < this->in.channels; n++) { - if (this->in.pos[n] == conv[c].pos1[0]) - pos1_0 = n; - else if (this->in.pos[n] == conv[c].pos1[1]) - pos1_1 = n; - else if (this->in.pos[n] == conv[c].pos2[0]) - pos1_2 = n; - } - for (n = 0; n < this->out.channels; n++) { - if (this->out.pos[n] == conv[c].pos1[0]) - pos2_0 = n; - else if (this->out.pos[n] == conv[c].pos1[1]) - pos2_1 = n; - else if (this->out.pos[n] == conv[c].pos2[0]) - pos2_2 = n; - } - - /* The general idea here is to fill in channels from the same position - * as good as possible. This means mixing left<->center and right<->center. - */ - - /* left -> center */ - if (pos1_0 != -1 && pos1_2 == -1 && pos2_0 == -1 && pos2_2 != -1) - this->matrix[pos1_0][pos2_2] = 1.0; - else if (pos1_0 != -1 && pos1_2 != -1 && pos2_0 == -1 && pos2_2 != -1) - this->matrix[pos1_0][pos2_2] = 0.5; - else if (pos1_0 != -1 && pos1_2 == -1 && pos2_0 != -1 && pos2_2 != -1) - this->matrix[pos1_0][pos2_2] = 1.0; - - /* right -> center */ - if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 == -1 && pos2_2 != -1) - this->matrix[pos1_1][pos2_2] = 1.0; - else if (pos1_1 != -1 && pos1_2 != -1 && pos2_1 == -1 && pos2_2 != -1) - this->matrix[pos1_1][pos2_2] = 0.5; - else if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 != -1 && pos2_2 != -1) - this->matrix[pos1_1][pos2_2] = 1.0; - - /* center -> left */ - if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 == -1 && pos2_0 != -1) - this->matrix[pos1_2][pos2_0] = 1.0; - else if (pos1_2 != -1 && pos1_0 != -1 && pos2_2 == -1 && pos2_0 != -1) - this->matrix[pos1_2][pos2_0] = 0.5; - else if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 != -1 && pos2_0 != -1) - this->matrix[pos1_2][pos2_0] = 1.0; - - /* center -> right */ - if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 == -1 && pos2_1 != -1) - this->matrix[pos1_2][pos2_1] = 1.0; - else if (pos1_2 != -1 && pos1_1 != -1 && pos2_2 == -1 && pos2_1 != -1) - this->matrix[pos1_2][pos2_1] = 0.5; - else if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 != -1 && pos2_1 != -1) - this->matrix[pos1_2][pos2_1] = 1.0; - } -} - -/* - * Detect and fill in channels not handled by the - * above two, e.g. center to left/right front in - * 5.1 to 2.0 (or the other way around). - * - * Unfortunately, limited to static conversions - * for now. - */ - -static void -gst_channel_mix_detect_pos (AudioConvertFmt * caps, - gint * f, gboolean * has_f, - gint * c, gboolean * has_c, gint * r, gboolean * has_r, - gint * s, gboolean * has_s, gint * b, gboolean * has_b) -{ - gint n; - - for (n = 0; n < caps->channels; n++) { - switch (caps->pos[n]) { - case GST_AUDIO_CHANNEL_POSITION_FRONT_MONO: - f[1] = n; - *has_f = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT: - f[0] = n; - *has_f = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT: - f[2] = n; - *has_f = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER: - c[1] = n; - *has_c = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER: - c[0] = n; - *has_c = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER: - c[2] = n; - *has_c = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_REAR_CENTER: - r[1] = n; - *has_r = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_REAR_LEFT: - r[0] = n; - *has_r = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT: - r[2] = n; - *has_r = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT: - s[0] = n; - *has_s = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT: - s[2] = n; - *has_s = TRUE; - break; - case GST_AUDIO_CHANNEL_POSITION_LFE: - *has_b = TRUE; - b[1] = n; - break; - default: - break; - } - } -} - -static void -gst_channel_mix_fill_one_other (gfloat ** matrix, - AudioConvertFmt * from_caps, gint * from_idx, - AudioConvertFmt * to_caps, gint * to_idx, gfloat ratio) -{ - - /* src & dst have center => passthrough */ - if (from_idx[1] != -1 && to_idx[1] != -1) { - matrix[from_idx[1]][to_idx[1]] = ratio; - } - - /* src & dst have left => passthrough */ - if (from_idx[0] != -1 && to_idx[0] != -1) { - matrix[from_idx[0]][to_idx[0]] = ratio; - } - - /* src & dst have right => passthrough */ - if (from_idx[2] != -1 && to_idx[2] != -1) { - matrix[from_idx[2]][to_idx[2]] = ratio; - } - - /* src has left & dst has center => put into center */ - if (from_idx[0] != -1 && to_idx[1] != -1 && from_idx[1] != -1) { - matrix[from_idx[0]][to_idx[1]] = 0.5 * ratio; - } else if (from_idx[0] != -1 && to_idx[1] != -1 && from_idx[1] == -1) { - matrix[from_idx[0]][to_idx[1]] = ratio; - } - - /* src has right & dst has center => put into center */ - if (from_idx[2] != -1 && to_idx[1] != -1 && from_idx[1] != -1) { - matrix[from_idx[2]][to_idx[1]] = 0.5 * ratio; - } else if (from_idx[2] != -1 && to_idx[1] != -1 && from_idx[1] == -1) { - matrix[from_idx[2]][to_idx[1]] = ratio; - } - - /* src has center & dst has left => passthrough */ - if (from_idx[1] != -1 && to_idx[0] != -1 && from_idx[0] != -1) { - matrix[from_idx[1]][to_idx[0]] = 0.5 * ratio; - } else if (from_idx[1] != -1 && to_idx[0] != -1 && from_idx[0] == -1) { - matrix[from_idx[1]][to_idx[0]] = ratio; - } - - /* src has center & dst has right => passthrough */ - if (from_idx[1] != -1 && to_idx[2] != -1 && from_idx[2] != -1) { - matrix[from_idx[1]][to_idx[2]] = 0.5 * ratio; - } else if (from_idx[1] != -1 && to_idx[2] != -1 && from_idx[2] == -1) { - matrix[from_idx[1]][to_idx[2]] = ratio; - } -} - -#define RATIO_CENTER_FRONT (1.0 / sqrt (2.0)) -#define RATIO_CENTER_SIDE (1.0 / 2.0) -#define RATIO_CENTER_REAR (1.0 / sqrt (8.0)) - -#define RATIO_FRONT_CENTER (1.0 / sqrt (2.0)) -#define RATIO_FRONT_SIDE (1.0 / sqrt (2.0)) -#define RATIO_FRONT_REAR (1.0 / 2.0) - -#define RATIO_SIDE_CENTER (1.0 / 2.0) -#define RATIO_SIDE_FRONT (1.0 / sqrt (2.0)) -#define RATIO_SIDE_REAR (1.0 / sqrt (2.0)) - -#define RATIO_CENTER_BASS (1.0 / sqrt (2.0)) -#define RATIO_FRONT_BASS (1.0) -#define RATIO_SIDE_BASS (1.0 / sqrt (2.0)) -#define RATIO_REAR_BASS (1.0 / sqrt (2.0)) - -static void -gst_channel_mix_fill_others (AudioConvertCtx * this) -{ - gboolean in_has_front = FALSE, out_has_front = FALSE, - in_has_center = FALSE, out_has_center = FALSE, - in_has_rear = FALSE, out_has_rear = FALSE, - in_has_side = FALSE, out_has_side = FALSE, - in_has_bass = FALSE, out_has_bass = FALSE; - /* LEFT, RIGHT, MONO */ - gint in_f[3] = { -1, -1, -1 }; - gint out_f[3] = { -1, -1, -1 }; - /* LOC, ROC, CENTER */ - gint in_c[3] = { -1, -1, -1 }; - gint out_c[3] = { -1, -1, -1 }; - /* RLEFT, RRIGHT, RCENTER */ - gint in_r[3] = { -1, -1, -1 }; - gint out_r[3] = { -1, -1, -1 }; - /* SLEFT, INVALID, SRIGHT */ - gint in_s[3] = { -1, -1, -1 }; - gint out_s[3] = { -1, -1, -1 }; - /* INVALID, LFE, INVALID */ - gint in_b[3] = { -1, -1, -1 }; - gint out_b[3] = { -1, -1, -1 }; - - /* First see where (if at all) the various channels from/to - * which we want to convert are located in our matrix/array. */ - gst_channel_mix_detect_pos (&this->in, - in_f, &in_has_front, - in_c, &in_has_center, in_r, &in_has_rear, - in_s, &in_has_side, in_b, &in_has_bass); - gst_channel_mix_detect_pos (&this->out, - out_f, &out_has_front, - out_c, &out_has_center, out_r, &out_has_rear, - out_s, &out_has_side, out_b, &out_has_bass); - - /* The general idea here is: - * - if the source has a channel that the destination doesn't have mix - * it into the nearest available destination channel - * - if the destination has a channel that the source doesn't have mix - * the nearest source channel into the destination channel - * - * The ratio for the mixing becomes lower as the distance between the - * channels gets larger - */ - - /* center <-> front/side/rear */ - if (!in_has_center && in_has_front && out_has_center) { - gst_channel_mix_fill_one_other (this->matrix, - &this->in, in_f, &this->out, out_c, RATIO_CENTER_FRONT); - } else if (!in_has_center && !in_has_front && in_has_side && out_has_center) { - gst_channel_mix_fill_one_other (this->matrix, - &this->in, in_s, &this->out, out_c, RATIO_CENTER_SIDE); - } else if (!in_has_center && !in_has_front && !in_has_side && in_has_rear - && out_has_center) { - gst_channel_mix_fill_one_other (this->matrix, &this->in, in_r, &this->out, - out_c, RATIO_CENTER_REAR); - } else if (in_has_center && !out_has_center && out_has_front) { - gst_channel_mix_fill_one_other (this->matrix, - &this->in, in_c, &this->out, out_f, RATIO_CENTER_FRONT); - } else if (in_has_center && !out_has_center && !out_has_front && 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_center && !out_has_center && !out_has_front && !out_has_side - && out_has_rear) { - gst_channel_mix_fill_one_other (this->matrix, &this->in, in_c, &this->out, - out_r, RATIO_CENTER_REAR); - } - - /* front <-> center/side/rear */ - if (!in_has_front && in_has_center && !in_has_side && out_has_front) { - gst_channel_mix_fill_one_other (this->matrix, - &this->in, in_c, &this->out, out_f, RATIO_CENTER_FRONT); - } else if (!in_has_front && !in_has_center && in_has_side && out_has_front) { - gst_channel_mix_fill_one_other (this->matrix, - &this->in, in_s, &this->out, out_f, RATIO_FRONT_SIDE); - } else if (!in_has_front && in_has_center && in_has_side && out_has_front) { - gst_channel_mix_fill_one_other (this->matrix, - &this->in, in_c, &this->out, out_f, 0.5 * RATIO_CENTER_FRONT); - gst_channel_mix_fill_one_other (this->matrix, - &this->in, in_s, &this->out, out_f, 0.5 * RATIO_FRONT_SIDE); - } else if (!in_has_front && !in_has_center && !in_has_side && in_has_rear - && 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_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, 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) -{ - AudioConvertFmt *in = &this->in, *out = &this->out; - - /* Special, standard conversions here */ - - /* Mono<->Stereo, just a fast-path */ - if (in->channels == 2 && out->channels == 1 && - ((in->pos[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT && - in->pos[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) || - (in->pos[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT && - in->pos[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) && - out->pos[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->pos[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT && - out->pos[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) || - (out->pos[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT && - out->pos[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) && - in->pos[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 (!this->in.unpositioned_layout) { - 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 (this->in.is_int || this->out.is_int) { - 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); - } -} |