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e268611ed8
Original commit message from CVS: * gst/mxf/Makefile.am: * gst/mxf/mxfaes-bwf.c: (mxf_bwf_create_caps): * gst/mxf/mxfalaw.c: (mxf_is_alaw_audio_essence_track), (mxf_alaw_handle_essence_element), (mxf_alaw_create_caps): * gst/mxf/mxfalaw.h: * gst/mxf/mxfdemux.c: (gst_mxf_demux_handle_header_metadata_update_streams): Add support for A-Law encoded audio essence (SMPTE 388M and 382M).
134 lines
4 KiB
C
134 lines
4 KiB
C
/* GStreamer
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* Copyright (C) 2008 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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gboolean
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mxf_is_alaw_audio_essence_track (const MXFMetadataTrack * 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->descriptor == NULL)
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return FALSE;
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for (i = 0; i < track->n_descriptor; i++) {
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MXFMetadataFileDescriptor *d = track->descriptor[i];
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MXFUL *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, MXFMetadataGenericPackage * package,
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MXFMetadataTrack * track, MXFMetadataStructuralComponent * component,
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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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GstCaps *
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mxf_alaw_create_caps (MXFMetadataGenericPackage * package,
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MXFMetadataTrack * track, GstTagList ** tags,
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MXFEssenceElementHandler * handler, gpointer * mapping_data)
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{
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MXFMetadataFileDescriptor *f = NULL;
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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 (package != NULL, NULL);
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g_return_val_if_fail (track != NULL, NULL);
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if (track->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->n_descriptor; i++) {
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if (((MXFMetadataGenericDescriptor *) track->descriptor[i])->type ==
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MXF_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR) {
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s = (MXFMetadataGenericSoundEssenceDescriptor *) track->descriptor[i];
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f = track->descriptor[i];
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break;
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} else if (((MXFMetadataGenericDescriptor *) track->
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descriptor[i])->is_file_descriptor
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&& ((MXFMetadataGenericDescriptor *) track->descriptor[i])->type !=
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MXF_METADATA_MULTIPLE_DESCRIPTOR) {
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f = track->descriptor[i];
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}
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}
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if (!f) {
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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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*handler = mxf_alaw_handle_essence_element;
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caps = gst_caps_new_simple ("audio/x-alaw", NULL);
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if (s) {
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if (s->audio_sampling_rate.n != 0 && s->audio_sampling_rate.d != 0)
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gst_caps_set_simple (caps, "rate", G_TYPE_INT,
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(gint) (((gdouble) s->audio_sampling_rate.n) /
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((gdouble) s->audio_sampling_rate.d) + 0.5), NULL);
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if (s->channel_count != 0)
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gst_caps_set_simple (caps, "channels", G_TYPE_INT, s->channel_count,
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NULL);
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/* TODO: Handle channel layout somehow? */
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} else {
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GST_WARNING ("Only a generic sound essence descriptor found");
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}
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return caps;
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}
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