/* GStreamer * Copyright (C) 2004 Ronald Bultje * Copyright (C) 2008 Sebastian Dröge * * audio-channel-mix.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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include "audio-channel-mix.h" #ifndef GST_DISABLE_GST_DEBUG #define GST_CAT_DEFAULT ensure_debug_category() static GstDebugCategory * ensure_debug_category (void) { static gsize cat_gonce = 0; if (g_once_init_enter (&cat_gonce)) { gsize cat_done; cat_done = (gsize) _gst_debug_category_new ("audio-channel-mix", 0, "audio-channel-mix object"); g_once_init_leave (&cat_gonce, cat_done); } return (GstDebugCategory *) cat_gonce; } #else #define ensure_debug_category() /* NOOP */ #endif /* GST_DISABLE_GST_DEBUG */ #define INT_MATRIX_FACTOR_EXPONENT 10 typedef void (*MixFunc) (GstAudioChannelMix * mix, const gpointer src, gpointer dst, gint samples); struct _GstAudioChannelMix { GstAudioChannelMixFlags flags; GstAudioFormat format; gint in_channels; gint out_channels; GstAudioChannelPosition in_position[64]; GstAudioChannelPosition out_position[64]; /* channel conversion matrix, m[in_channels][out_channels]. * If identity matrix, passthrough applies. */ gfloat **matrix; /* channel conversion matrix with int values, m[in_channels][out_channels]. * this is matrix * (2^10) as integers */ gint **matrix_int; MixFunc func; gpointer tmp; }; /** * gst_audio_channel_mix_free: * @mix: a #GstAudioChannelMix * * Free memory allocated by @mix. */ void gst_audio_channel_mix_free (GstAudioChannelMix * mix) { gint i; /* free */ for (i = 0; i < mix->in_channels; i++) g_free (mix->matrix[i]); g_free (mix->matrix); mix->matrix = NULL; for (i = 0; i < mix->in_channels; i++) g_free (mix->matrix_int[i]); g_free (mix->matrix_int); mix->matrix_int = NULL; g_free (mix->tmp); mix->tmp = NULL; g_slice_free (GstAudioChannelMix, mix); } /* * 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_audio_channel_mix_fill_identical (GstAudioChannelMix * mix) { 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 < mix->out_channels; co++) { /* find a channel in input with same position */ for (ci = 0; ci < mix->in_channels; ci++) { if (mix->in_position[ci] == mix->out_position[co]) { mix->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_audio_channel_mix_fill_compatible (GstAudioChannelMix * mix) { /* 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_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 < mix->in_channels; n++) { if (mix->in_position[n] == conv[c].pos1[0]) pos1_0 = n; else if (mix->in_position[n] == conv[c].pos1[1]) pos1_1 = n; else if (mix->in_position[n] == conv[c].pos2[0]) pos1_2 = n; } for (n = 0; n < mix->out_channels; n++) { if (mix->out_position[n] == conv[c].pos1[0]) pos2_0 = n; else if (mix->out_position[n] == conv[c].pos1[1]) pos2_1 = n; else if (mix->out_position[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) mix->matrix[pos1_0][pos2_2] = 1.0; else if (pos1_0 != -1 && pos1_2 != -1 && pos2_0 == -1 && pos2_2 != -1) mix->matrix[pos1_0][pos2_2] = 0.5; else if (pos1_0 != -1 && pos1_2 == -1 && pos2_0 != -1 && pos2_2 != -1) mix->matrix[pos1_0][pos2_2] = 1.0; /* right -> center */ if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 == -1 && pos2_2 != -1) mix->matrix[pos1_1][pos2_2] = 1.0; else if (pos1_1 != -1 && pos1_2 != -1 && pos2_1 == -1 && pos2_2 != -1) mix->matrix[pos1_1][pos2_2] = 0.5; else if (pos1_1 != -1 && pos1_2 == -1 && pos2_1 != -1 && pos2_2 != -1) mix->matrix[pos1_1][pos2_2] = 1.0; /* center -> left */ if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 == -1 && pos2_0 != -1) mix->matrix[pos1_2][pos2_0] = 1.0; else if (pos1_2 != -1 && pos1_0 != -1 && pos2_2 == -1 && pos2_0 != -1) mix->matrix[pos1_2][pos2_0] = 0.5; else if (pos1_2 != -1 && pos1_0 == -1 && pos2_2 != -1 && pos2_0 != -1) mix->matrix[pos1_2][pos2_0] = 1.0; /* center -> right */ if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 == -1 && pos2_1 != -1) mix->matrix[pos1_2][pos2_1] = 1.0; else if (pos1_2 != -1 && pos1_1 != -1 && pos2_2 == -1 && pos2_1 != -1) mix->matrix[pos1_2][pos2_1] = 0.5; else if (pos1_2 != -1 && pos1_1 == -1 && pos2_2 != -1 && pos2_1 != -1) mix->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_audio_channel_mix_detect_pos (gint channels, GstAudioChannelPosition position[64], 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 < channels; n++) { switch (position[n]) { case GST_AUDIO_CHANNEL_POSITION_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_LFE1: *has_b = TRUE; b[1] = n; break; default: break; } } } static void gst_audio_channel_mix_fill_one_other (gfloat ** matrix, gint * from_idx, 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_audio_channel_mix_fill_others (GstAudioChannelMix * mix) { 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_audio_channel_mix_detect_pos (mix->in_channels, mix->in_position, 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_audio_channel_mix_detect_pos (mix->out_channels, mix->out_position, 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_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_c, RATIO_CENTER_FRONT); } else if (!in_has_center && !in_has_front && in_has_side && out_has_center) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_c, RATIO_CENTER_SIDE); } else if (!in_has_center && !in_has_front && !in_has_side && in_has_rear && out_has_center) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_r, out_c, RATIO_CENTER_REAR); } else if (in_has_center && !out_has_center && out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_f, RATIO_CENTER_FRONT); } else if (in_has_center && !out_has_center && !out_has_front && out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_s, RATIO_CENTER_SIDE); } else if (in_has_center && !out_has_center && !out_has_front && !out_has_side && out_has_rear) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_r, RATIO_CENTER_REAR); } /* front <-> center/side/rear */ if (!in_has_front && in_has_center && !in_has_side && out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_f, RATIO_CENTER_FRONT); } else if (!in_has_front && !in_has_center && in_has_side && out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_f, RATIO_FRONT_SIDE); } else if (!in_has_front && in_has_center && in_has_side && out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_f, 0.5 * RATIO_CENTER_FRONT); gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, 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_audio_channel_mix_fill_one_other (mix->matrix, in_r, out_f, RATIO_FRONT_REAR); } else if (in_has_front && out_has_center && !out_has_side && !out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_c, RATIO_CENTER_FRONT); } else if (in_has_front && !out_has_center && out_has_side && !out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_s, RATIO_FRONT_SIDE); } else if (in_has_front && out_has_center && out_has_side && !out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_c, 0.5 * RATIO_CENTER_FRONT); gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, 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_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_r, RATIO_FRONT_REAR); } /* side <-> center/front/rear */ if (!in_has_side && in_has_front && !in_has_rear && out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_s, RATIO_FRONT_SIDE); } else if (!in_has_side && !in_has_front && in_has_rear && out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_r, out_s, RATIO_SIDE_REAR); } else if (!in_has_side && in_has_front && in_has_rear && out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_s, 0.5 * RATIO_FRONT_SIDE); gst_audio_channel_mix_fill_one_other (mix->matrix, in_r, 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_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_s, RATIO_CENTER_SIDE); } else if (in_has_side && out_has_front && !out_has_rear && !out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_f, RATIO_FRONT_SIDE); } else if (in_has_side && !out_has_front && out_has_rear && !out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_r, RATIO_SIDE_REAR); } else if (in_has_side && out_has_front && out_has_rear && !out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_f, 0.5 * RATIO_FRONT_SIDE); gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, 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_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_c, RATIO_CENTER_SIDE); } /* rear <-> center/front/side */ if (!in_has_rear && in_has_side && out_has_rear) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_r, RATIO_SIDE_REAR); } else if (!in_has_rear && !in_has_side && in_has_front && out_has_rear) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_r, RATIO_FRONT_REAR); } else if (!in_has_rear && !in_has_side && !in_has_front && in_has_center && out_has_rear) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_r, RATIO_CENTER_REAR); } else if (in_has_rear && !out_has_rear && out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_r, out_s, RATIO_SIDE_REAR); } else if (in_has_rear && !out_has_rear && !out_has_side && out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_r, out_f, RATIO_FRONT_REAR); } else if (in_has_rear && !out_has_rear && !out_has_side && !out_has_front && out_has_center) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_r, out_c, RATIO_CENTER_REAR); } /* bass <-> any */ if (in_has_bass && !out_has_bass) { if (out_has_center) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_b, out_c, RATIO_CENTER_BASS); } if (out_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_b, out_f, RATIO_FRONT_BASS); } if (out_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_b, out_s, RATIO_SIDE_BASS); } if (out_has_rear) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_b, out_r, RATIO_REAR_BASS); } } else if (!in_has_bass && out_has_bass) { if (in_has_center) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_c, out_b, RATIO_CENTER_BASS); } if (in_has_front) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_f, out_b, RATIO_FRONT_BASS); } if (in_has_side) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_s, out_b, RATIO_REAR_BASS); } if (in_has_rear) { gst_audio_channel_mix_fill_one_other (mix->matrix, in_r, out_b, RATIO_REAR_BASS); } } } /* * Normalize output values. */ static void gst_audio_channel_mix_fill_normalize (GstAudioChannelMix * mix) { gfloat sum, top = 0; gint i, j; for (j = 0; j < mix->out_channels; j++) { /* calculate sum */ sum = 0.0; for (i = 0; i < mix->in_channels; i++) { sum += fabs (mix->matrix[i][j]); } if (sum > top) { top = sum; } } /* normalize to mix */ if (top == 0.0) return; for (j = 0; j < mix->out_channels; j++) { for (i = 0; i < mix->in_channels; i++) { mix->matrix[i][j] /= top; } } } static gboolean gst_audio_channel_mix_fill_special (GstAudioChannelMix * mix) { /* Special, standard conversions here */ /* Mono<->Stereo, just a fast-path */ if (mix->in_channels == 2 && mix->out_channels == 1 && ((mix->in_position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT && mix->in_position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) || (mix->in_position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT && mix->in_position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) && mix->out_position[0] == GST_AUDIO_CHANNEL_POSITION_MONO) { mix->matrix[0][0] = 0.5; mix->matrix[1][0] = 0.5; return TRUE; } else if (mix->in_channels == 1 && mix->out_channels == 2 && ((mix->out_position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT && mix->out_position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT) || (mix->out_position[0] == GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT && mix->out_position[1] == GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT)) && mix->in_position[0] == GST_AUDIO_CHANNEL_POSITION_MONO) { mix->matrix[0][0] = 1.0; mix->matrix[0][1] = 1.0; return TRUE; } /* TODO: 5.1 <-> Stereo and other standard conversions */ return FALSE; } /* * Automagically generate conversion matrix. */ static void gst_audio_channel_mix_fill_matrix (GstAudioChannelMix * mix) { if (gst_audio_channel_mix_fill_special (mix)) return; gst_audio_channel_mix_fill_identical (mix); if (!(mix->flags & GST_AUDIO_CHANNEL_MIX_FLAGS_UNPOSITIONED_IN)) { gst_audio_channel_mix_fill_compatible (mix); gst_audio_channel_mix_fill_others (mix); gst_audio_channel_mix_fill_normalize (mix); } } /* only call mix after mix->matrix is fully set up and normalized */ static void gst_audio_channel_mix_setup_matrix_int (GstAudioChannelMix * mix) { gint i, j; gfloat tmp; gfloat factor = (1 << INT_MATRIX_FACTOR_EXPONENT); mix->matrix_int = g_new0 (gint *, mix->in_channels); for (i = 0; i < mix->in_channels; i++) { mix->matrix_int[i] = g_new (gint, mix->out_channels); for (j = 0; j < mix->out_channels; j++) { tmp = mix->matrix[i][j] * factor; mix->matrix_int[i][j] = (gint) tmp; } } } static void gst_audio_channel_mix_setup_matrix (GstAudioChannelMix * mix) { gint i, j; mix->tmp = (gpointer) g_new (gdouble, mix->out_channels); /* allocate */ mix->matrix = g_new0 (gfloat *, mix->in_channels); for (i = 0; i < mix->in_channels; i++) { mix->matrix[i] = g_new (gfloat, mix->out_channels); for (j = 0; j < mix->out_channels; j++) mix->matrix[i][j] = 0.; } /* setup the matrix' internal values */ gst_audio_channel_mix_fill_matrix (mix); gst_audio_channel_mix_setup_matrix_int (mix); #ifndef GST_DISABLE_GST_DEBUG /* debug */ { GString *s; s = g_string_new ("Matrix for"); g_string_append_printf (s, " %d -> %d: ", mix->in_channels, mix->out_channels); g_string_append (s, "{"); for (i = 0; i < mix->in_channels; i++) { if (i != 0) g_string_append (s, ","); g_string_append (s, " {"); for (j = 0; j < mix->out_channels; j++) { if (j != 0) g_string_append (s, ","); g_string_append_printf (s, " %f", mix->matrix[i][j]); } g_string_append (s, " }"); } g_string_append (s, " }"); GST_DEBUG ("%s", s->str); g_string_free (s, TRUE); } #endif } /* IMPORTANT: out_data == in_data is possible, make sure to not overwrite data * you might need later on! */ static void gst_audio_channel_mix_mix_int (GstAudioChannelMix * mix, const gint32 * in_data, gint32 * out_data, gint samples) { gint in, out, n; gint64 res; gboolean backwards; gint inchannels, outchannels; gint32 *tmp = (gint32 *) mix->tmp; g_return_if_fail (mix->tmp != NULL); inchannels = mix->in_channels; outchannels = mix->out_channels; backwards = outchannels > inchannels; /* FIXME: use orc 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] * (gint64) mix->matrix_int[in][out]; } /* remove factor from int matrix */ res = res >> INT_MATRIX_FACTOR_EXPONENT; /* 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], mix->tmp, sizeof (gint32) * outchannels); } } static void gst_audio_channel_mix_mix_double (GstAudioChannelMix * mix, const gdouble * in_data, gdouble * out_data, gint samples) { gint in, out, n; gdouble res; gboolean backwards; gint inchannels, outchannels; gdouble *tmp = (gdouble *) mix->tmp; g_return_if_fail (mix->tmp != NULL); inchannels = mix->in_channels; outchannels = mix->out_channels; backwards = outchannels > inchannels; /* FIXME: use orc 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] * mix->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], mix->tmp, sizeof (gdouble) * outchannels); } } /** * gst_audio_channel_mix_new: * @flags: * @in_channels: * @in_position: * @out_channels: * @out_position: * * Create a new channel mixer object. * * Returns: a new #GstAudioChannelMix object. Free with gst_audio_channel_mix_free() * after usage. */ GstAudioChannelMix * gst_audio_channel_mix_new (GstAudioChannelMixFlags flags, GstAudioFormat format, gint in_channels, GstAudioChannelPosition * in_position, gint out_channels, GstAudioChannelPosition * out_position) { GstAudioChannelMix *mix; gint i; g_return_val_if_fail (format == GST_AUDIO_FORMAT_S32 || format == GST_AUDIO_FORMAT_F64, NULL); g_return_val_if_fail (in_channels > 0 && in_channels < 64, NULL); g_return_val_if_fail (out_channels > 0 && out_channels < 64, NULL); mix = g_slice_new0 (GstAudioChannelMix); mix->flags = flags; mix->format = format; mix->in_channels = in_channels; mix->out_channels = out_channels; for (i = 0; i < in_channels; i++) mix->in_position[i] = in_position[i]; for (i = 0; i < out_channels; i++) mix->out_position[i] = out_position[i]; gst_audio_channel_mix_setup_matrix (mix); switch (mix->format) { case GST_AUDIO_FORMAT_S32: mix->func = (MixFunc) gst_audio_channel_mix_mix_int; break; case GST_AUDIO_FORMAT_F64: mix->func = (MixFunc) gst_audio_channel_mix_mix_double; break; default: g_assert_not_reached (); break; } return mix; } /** * gst_audio_channel_mix_is_passthrough: * @mix: a #GstAudioChannelMix * * Check if @mix is in passthrough. * * Returns: %TRUE is @mix is passthrough. */ gboolean gst_audio_channel_mix_is_passthrough (GstAudioChannelMix * mix) { gint i; guint64 in_mask, out_mask; /* only NxN matrices can be identities */ if (mix->in_channels != mix->out_channels) return FALSE; /* passthrough for 1->1 channels (MONO and NONE position are the same here) */ if (mix->in_channels == 1 && mix->out_channels == 1) return TRUE; /* passthrough if both channel masks are the same */ in_mask = out_mask = 0; for (i = 0; i < mix->in_channels; i++) { in_mask |= mix->in_position[i]; out_mask |= mix->out_position[i]; } return in_mask == out_mask; } /** * gst_audio_channel_mix_samples: * @mix: a #GstAudioChannelMix * @format: a #GstAudioFormat * @layout: a #GstAudioLayout * @in_data: input samples * @out_data: output samples * @samples: number of samples * * Perform channel mixing on @in_data and write the result to @out_data. * @in_data and @out_data need to be in @format and @layout. */ void gst_audio_channel_mix_samples (GstAudioChannelMix * mix, const gpointer in_data, gpointer out_data, gint samples) { g_return_if_fail (mix != NULL); g_return_if_fail (mix->matrix != NULL); mix->func (mix, in_data, out_data, samples); }