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184 lines
5.9 KiB
C
184 lines
5.9 KiB
C
/* GStreamer
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* Copyright (C) <2011> 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 "gstaudiometa.h"
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static gboolean
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gst_audio_downmix_meta_init (GstMeta * meta, gpointer params,
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GstBuffer * buffer)
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{
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GstAudioDownmixMeta *dmeta = (GstAudioDownmixMeta *) meta;
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dmeta->from_position = dmeta->to_position = NULL;
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dmeta->from_channels = dmeta->to_channels = 0;
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dmeta->matrix = NULL;
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return TRUE;
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}
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static void
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gst_audio_downmix_meta_free (GstMeta * meta, GstBuffer * buffer)
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{
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GstAudioDownmixMeta *dmeta = (GstAudioDownmixMeta *) meta;
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g_free (dmeta->from_position);
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if (dmeta->matrix) {
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g_free (*dmeta->matrix);
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g_free (dmeta->matrix);
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}
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}
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static gboolean
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gst_audio_downmix_meta_transform (GstBuffer * dest, GstMeta * meta,
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GstBuffer * buffer, GQuark type, gpointer data)
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{
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GstAudioDownmixMeta *smeta;
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smeta = (GstAudioDownmixMeta *) meta;
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gst_buffer_add_audio_downmix_meta (dest, smeta->from_position,
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smeta->from_channels, smeta->to_position, smeta->to_channels,
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(const gfloat **) smeta->matrix);
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return TRUE;
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}
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/**
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* gst_buffer_get_audio_downmix_meta_for_channels:
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* @buffer: a #GstBuffer
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* @to_position: (array length=to_channels): the channel positions of
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* the destination
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* @to_channels: The number of channels of the destination
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*
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* Find the #GstAudioDownmixMeta on @buffer for the given destination
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* channel positions.
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*
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* Returns: the #GstAudioDownmixMeta on @buffer.
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*/
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GstAudioDownmixMeta *
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gst_buffer_get_audio_downmix_meta_for_channels (GstBuffer * buffer,
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const GstAudioChannelPosition * to_position, gint to_channels)
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{
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gpointer state = NULL;
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GstMeta *meta;
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const GstMetaInfo *info = GST_AUDIO_DOWNMIX_META_INFO;
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while ((meta = gst_buffer_iterate_meta (buffer, &state))) {
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if (meta->info->api == info->api) {
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GstAudioDownmixMeta *ameta = (GstAudioDownmixMeta *) meta;
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if (ameta->to_channels == to_channels &&
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memcmp (ameta->to_position, to_position,
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sizeof (GstAudioChannelPosition) * to_channels) == 0)
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return ameta;
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}
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}
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return NULL;
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}
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/**
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* gst_buffer_add_audio_downmix_meta:
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* @buffer: a #GstBuffer
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* @from_position: (array length=from_channels): the channel positions
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* of the source
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* @from_channels: The number of channels of the source
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* @to_position: (array length=to_channels): the channel positions of
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* the destination
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* @to_channels: The number of channels of the destination
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* @matrix: The matrix coefficients.
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*
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* Attaches GstAudioDownmixMeta metadata to @buffer with the given parameters.
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*
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* @matrix is an two-dimensional array of @to_channels times @from_channels
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* coefficients, i.e. the i-th output channels is constructed by multiplicating
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* the input channels with the coefficients in @matrix[i] and taking the sum
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* of the results.
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*
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* Returns: the #GstAudioDownmixMeta on @buffer.
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*/
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GstAudioDownmixMeta *
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gst_buffer_add_audio_downmix_meta (GstBuffer * buffer,
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const GstAudioChannelPosition * from_position, gint from_channels,
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const GstAudioChannelPosition * to_position, gint to_channels,
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const gfloat ** matrix)
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{
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GstAudioDownmixMeta *meta;
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gint i;
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g_return_val_if_fail (from_position != NULL, NULL);
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g_return_val_if_fail (from_channels > 0, NULL);
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g_return_val_if_fail (to_position != NULL, NULL);
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g_return_val_if_fail (to_channels > 0, NULL);
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g_return_val_if_fail (matrix != NULL, NULL);
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meta =
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(GstAudioDownmixMeta *) gst_buffer_add_meta (buffer,
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GST_AUDIO_DOWNMIX_META_INFO, NULL);
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meta->from_channels = from_channels;
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meta->to_channels = to_channels;
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meta->from_position =
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g_new (GstAudioChannelPosition, meta->from_channels + meta->to_channels);
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meta->to_position = meta->from_position + meta->from_channels;
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memcpy (meta->from_position, from_position,
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sizeof (GstAudioChannelPosition) * meta->from_channels);
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memcpy (meta->to_position, to_position,
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sizeof (GstAudioChannelPosition) * meta->to_channels);
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meta->matrix = g_new (gfloat *, meta->to_channels);
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meta->matrix[0] = g_new (gfloat, meta->from_channels * meta->to_channels);
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memcpy (meta->matrix[0], matrix[0], sizeof (gfloat) * meta->from_channels);
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for (i = 1; i < meta->to_channels; i++) {
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meta->matrix[i] = meta->matrix[0] + i * meta->from_channels;
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memcpy (meta->matrix[i], matrix[i], sizeof (gfloat) * meta->from_channels);
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}
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return meta;
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}
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GType
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gst_audio_downmix_meta_api_get_type (void)
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{
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static volatile GType type;
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static const gchar *tags[] =
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{ GST_META_TAG_AUDIO_STR, GST_META_TAG_AUDIO_CHANNELS_STR, NULL };
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if (g_once_init_enter (&type)) {
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GType _type = gst_meta_api_type_register ("GstAudioDownmixMetaAPI", tags);
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g_once_init_leave (&type, _type);
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}
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return type;
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}
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const GstMetaInfo *
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gst_audio_downmix_meta_get_info (void)
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{
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static const GstMetaInfo *audio_downmix_meta_info = NULL;
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if (g_once_init_enter (&audio_downmix_meta_info)) {
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const GstMetaInfo *meta =
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gst_meta_register (GST_AUDIO_DOWNMIX_META_API_TYPE,
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"GstAudioDownmixMeta", sizeof (GstAudioDownmixMeta),
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gst_audio_downmix_meta_init, gst_audio_downmix_meta_free,
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gst_audio_downmix_meta_transform);
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g_once_init_leave (&audio_downmix_meta_info, meta);
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}
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return audio_downmix_meta_info;
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}
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