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310 lines
8.4 KiB
C
310 lines
8.4 KiB
C
/* GStreamer
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* Copyright (C) <2008> Wim Taymans <wim.taymans@gmail.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include "gstrtpchannels.h"
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/*
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* RTP channel positions as discussed in RFC 3551 and also RFC 3555
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*
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* We can't really represent the described channel positions in GStreamer but we
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* implement a (very rough) approximation here.
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*/
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static const GstAudioChannelPosition pos_4_1[] = {
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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_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT
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};
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static const GstAudioChannelPosition pos_4_2[] = {
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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_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1
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};
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static const GstAudioChannelPosition pos_4_3[] = {
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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_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1
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};
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static const GstAudioChannelPosition pos_5_1[] = {
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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_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER
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};
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static const GstAudioChannelPosition pos_6_1[] = {
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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_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1
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};
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static const GstAudioChannelPosition pos_6_2[] = {
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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_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT
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};
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static const GstAudioChannelPosition pos_8_1[] = {
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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_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT
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};
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static const GstAudioChannelPosition pos_8_2[] = {
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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_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT
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};
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static const GstAudioChannelPosition pos_8_3[] = {
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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_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT
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};
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static const GstAudioChannelPosition pos_def_1[] = {
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GST_AUDIO_CHANNEL_POSITION_MONO
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};
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static const GstAudioChannelPosition pos_def_2[] = {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT
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};
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static const GstAudioChannelPosition pos_def_3[] = {
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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_CENTER
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};
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static const GstAudioChannelPosition pos_def_4[] = {
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_LFE1
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};
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static const GstAudioChannelPosition pos_def_5[] = {
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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_CENTER,
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT
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};
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static const GstAudioChannelPosition pos_def_6[] = {
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_LFE1
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};
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const GstRTPChannelOrder gst_rtp_channel_orders[] = {
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/* 4 channels */
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{"DV.LRLsRs", 4, pos_4_1},
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{"DV.LRCS", 4, pos_4_2},
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{"DV.LRCWo", 4, pos_4_3},
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/* 5 channels */
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{"DV.LRLsRsC", 5, pos_5_1},
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/* 6 channels */
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{"DV.LRLsRsCS", 6, pos_6_1},
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{"DV.LmixRmixTWoQ1Q2", 6, pos_6_2},
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/* 8 channels */
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{"DV.LRCWoLsRsLmixRmix", 8, pos_8_1},
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{"DV.LRCWoLs1Rs1Ls2Rs2", 8, pos_8_2},
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{"DV.LRCWoLsRsLcRc", 8, pos_8_3},
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/* default layouts */
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{NULL, 1, pos_def_1},
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{NULL, 2, pos_def_2},
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{NULL, 3, pos_def_3},
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{NULL, 4, pos_def_4},
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{NULL, 5, pos_def_5},
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{NULL, 6, pos_def_6},
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/* terminator, invalid entry */
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{NULL, 0, NULL},
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};
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static gboolean
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check_channels (const GstRTPChannelOrder * order,
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const GstAudioChannelPosition * pos)
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{
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gint i, j;
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gboolean res = TRUE;
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for (i = 0; i < order->channels; i++) {
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for (j = 0; j < order->channels; j++) {
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if (order->pos[j] == pos[i])
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break;
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}
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if (j == order->channels)
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return FALSE;
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}
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return res;
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}
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/**
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* gst_rtp_channels_get_by_pos:
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* @channels: the amount of channels
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* @pos: a channel layout
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*
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* Return a description of the channel layout.
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*
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* Returns: a #GstRTPChannelOrder with the channel information or NULL when @pos
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* is not a valid layout.
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*/
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const GstRTPChannelOrder *
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gst_rtp_channels_get_by_pos (gint channels, const GstAudioChannelPosition * pos)
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{
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gint i;
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const GstRTPChannelOrder *res = NULL;
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g_return_val_if_fail (pos != NULL, NULL);
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for (i = 0; channel_orders[i].pos; i++) {
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if (channel_orders[i].channels != channels)
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continue;
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if (check_channels (&channel_orders[i], pos)) {
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res = &channel_orders[i];
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break;
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}
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}
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return res;
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}
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/**
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* gst_rtp_channels_create_default:
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* @channels: the amount of channels
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* @order: a channel order
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*
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* Get the channel order info the @order and @channels.
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*
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* Returns: a #GstRTPChannelOrder with the channel information or NULL when
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* @order is not a know layout for @channels.
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*/
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const GstRTPChannelOrder *
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gst_rtp_channels_get_by_order (gint channels, const gchar * order)
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{
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gint i;
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const GstRTPChannelOrder *res = NULL;
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for (i = 0; channel_orders[i].pos; i++) {
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if (channel_orders[i].channels != channels)
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continue;
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/* no name but channels match, continue */
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if (!channel_orders[i].name || !order) {
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res = &channel_orders[i];
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break;
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}
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/* compare names */
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if (g_ascii_strcasecmp (channel_orders[i].name, order)) {
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res = &channel_orders[i];
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break;
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}
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}
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return res;
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}
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/**
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* gst_rtp_channels_get_by_index:
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* @channels: the amount of channels
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* @idx: the channel index to retrieve
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*
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* Get the allowed channel order descriptions for @channels. @idx can be used to
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* retrieve the desired index.
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*
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* Returns: a #GstRTPChannelOrder at @idx, NULL when there are no valid channel
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* orders.
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*/
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const GstRTPChannelOrder *
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gst_rtp_channels_get_by_index (gint channels, guint idx)
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{
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gint i;
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const GstRTPChannelOrder *res = NULL;
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for (i = 0; channel_orders[i].pos; i++) {
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if (channel_orders[i].channels != channels)
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continue;
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if (idx == 0) {
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res = &channel_orders[i];
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break;
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}
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idx--;
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}
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return res;
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}
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/**
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* gst_rtp_channels_create_default:
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* @channels: the amount of channels
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*
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* Create a default none channel mapping for @channels.
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*
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* Returns: a #GstAudioChannelPosition with all the channel position info set to
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* #GST_AUDIO_CHANNEL_POSITION_NONE.
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*/
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void
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gst_rtp_channels_create_default (gint channels, GstAudioChannelPosition * posn)
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{
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gint i;
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g_return_if_fail (channels > 0);
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for (i = 0; i < channels; i++)
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posn[i] = GST_AUDIO_CHANNEL_POSITION_NONE;
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}
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