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91b35975b5
Generate an index table for essence streams during playback and make sure that only the correct essence elements are used for played tracks. Make it possible to have one essence stream used in multiple playback tracks. Fix some minor bugs.
145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
/* GStreamer
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* Copyright (C) 2008-2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
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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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/* Implementation of SMPTE 388M - Mapping A-Law coded audio into the MXF
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* Generic Container
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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 <gst/gst.h>
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#include <string.h>
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#include "mxfalaw.h"
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GST_DEBUG_CATEGORY_EXTERN (mxf_debug);
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#define GST_CAT_DEFAULT mxf_debug
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static gboolean
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mxf_is_alaw_essence_track (const MXFMetadataTimelineTrack * track)
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{
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guint i;
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g_return_val_if_fail (track != NULL, FALSE);
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if (track->parent.descriptor == NULL)
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return FALSE;
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for (i = 0; i < track->parent.n_descriptor; i++) {
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MXFMetadataFileDescriptor *d = track->parent.descriptor[i];
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MXFUL *key;
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if (!d)
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continue;
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key = &d->essence_container;
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/* SMPTE 388M 6.1 */
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if (mxf_is_generic_container_essence_container_label (key) &&
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key->u[12] == 0x02 && key->u[13] == 0x0a &&
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(key->u[14] == 0x01 || key->u[14] == 0x02 || key->u[14] == 0x03))
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return TRUE;
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}
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return FALSE;
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}
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static GstFlowReturn
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mxf_alaw_handle_essence_element (const MXFUL * key, GstBuffer * buffer,
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GstCaps * caps,
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MXFMetadataTimelineTrack * track,
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gpointer mapping_data, GstBuffer ** outbuf)
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{
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*outbuf = buffer;
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/* SMPTE 388M 5.1 */
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if (key->u[12] != 0x16 || (key->u[14] != 0x08 && key->u[14] != 0x09
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&& key->u[14] != 0x0a)) {
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GST_ERROR ("Invalid A-Law essence element");
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return GST_FLOW_ERROR;
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}
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return GST_FLOW_OK;
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}
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static GstCaps *
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mxf_alaw_create_caps (MXFMetadataTimelineTrack * track, GstTagList ** tags,
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MXFEssenceElementHandleFunc * handler, gpointer * mapping_data)
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{
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MXFMetadataGenericSoundEssenceDescriptor *s = NULL;
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guint i;
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GstCaps *caps = NULL;
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g_return_val_if_fail (track != NULL, NULL);
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if (track->parent.descriptor == NULL) {
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GST_ERROR ("No descriptor found for this track");
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return NULL;
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}
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for (i = 0; i < track->parent.n_descriptor; i++) {
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if (!track->parent.descriptor[i])
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continue;
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if (MXF_IS_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR (track->parent.
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descriptor[i])) {
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s = (MXFMetadataGenericSoundEssenceDescriptor *) track->parent.
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descriptor[i];
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break;
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}
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}
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if (!s) {
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GST_ERROR ("No generic sound essence descriptor found for this track");
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return NULL;
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}
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*handler = mxf_alaw_handle_essence_element;
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if (s && s->audio_sampling_rate.n != 0 && s->audio_sampling_rate.d != 0 &&
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s->channel_count != 0) {
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caps = gst_caps_new_simple ("audio/x-alaw", NULL);
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mxf_metadata_generic_sound_essence_descriptor_set_caps (s, caps);
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/* TODO: Handle channel layout somehow?
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* Or is alaw limited to two channels? */
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if (!*tags)
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*tags = gst_tag_list_new ();
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gst_tag_list_add (*tags, GST_TAG_MERGE_APPEND, GST_TAG_AUDIO_CODEC,
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"A-law encoded audio", NULL);
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}
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return caps;
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}
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static const MXFEssenceElementHandler mxf_alaw_essence_element_handler = {
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mxf_is_alaw_essence_track,
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mxf_alaw_create_caps
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};
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void
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mxf_alaw_init (void)
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{
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mxf_essence_element_handler_register (&mxf_alaw_essence_element_handler);
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}
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