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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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305 lines
8.3 KiB
C
305 lines
8.3 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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#include "mxfessence.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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typedef struct
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{
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guint64 error;
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gint rate, channels;
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MXFFraction edit_rate;
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} ALawMappingData;
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static GstFlowReturn
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mxf_alaw_write_func (GstBuffer * buffer, GstCaps * caps, gpointer mapping_data,
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GstAdapter * adapter, GstBuffer ** outbuf, gboolean flush)
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{
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ALawMappingData *md = mapping_data;
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guint bytes;
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guint64 speu =
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gst_util_uint64_scale (md->rate, md->edit_rate.d, md->edit_rate.n);
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md->error += (md->edit_rate.d * md->rate) % (md->edit_rate.n);
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if (md->error >= md->edit_rate.n) {
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md->error = 0;
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speu += 1;
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}
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bytes = speu * md->channels;
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if (buffer)
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gst_adapter_push (adapter, buffer);
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if (gst_adapter_available (adapter) == 0)
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return GST_FLOW_OK;
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if (flush)
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bytes = MIN (gst_adapter_available (adapter), bytes);
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if (gst_adapter_available (adapter) >= bytes) {
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*outbuf = gst_adapter_take_buffer (adapter, bytes);
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}
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if (gst_adapter_available (adapter) >= bytes)
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return GST_FLOW_CUSTOM_SUCCESS;
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else
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return GST_FLOW_OK;
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}
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static const guint8 alaw_essence_container_ul[] = {
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0x06, 0x0e, 0x2b, 0x34, 0x04, 0x01, 0x01, 0x03,
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0x0d, 0x01, 0x03, 0x01, 0x02, 0x0a, 0x01, 0x00
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};
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static const MXFUL mxf_sound_essence_compression_alaw =
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{ {0x06, 0x0E, 0x2B, 0x34, 0x04, 0x01, 0x01, 0x03, 0x04, 0x02, 0x02, 0x02,
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0x03, 0x01, 0x01, 0x00}
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};
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static MXFMetadataFileDescriptor *
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mxf_alaw_get_descriptor (GstPadTemplate * tmpl, GstCaps * caps,
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MXFEssenceElementWriteFunc * handler, gpointer * mapping_data)
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{
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MXFMetadataGenericSoundEssenceDescriptor *ret;
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GstStructure *s;
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ALawMappingData *md;
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gint rate, channels;
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s = gst_caps_get_structure (caps, 0);
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if (strcmp (gst_structure_get_name (s), "audio/x-alaw") != 0 ||
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!gst_structure_get_int (s, "rate", &rate) ||
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!gst_structure_get_int (s, "channels", &channels)) {
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GST_ERROR ("Invalid caps %" GST_PTR_FORMAT, caps);
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return NULL;
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}
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ret = (MXFMetadataGenericSoundEssenceDescriptor *)
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g_object_new (MXF_TYPE_METADATA_GENERIC_SOUND_ESSENCE_DESCRIPTOR, NULL);
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memcpy (&ret->parent.essence_container, &alaw_essence_container_ul, 16);
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memcpy (&ret->sound_essence_compression, &mxf_sound_essence_compression_alaw,
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16);
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if (!mxf_metadata_generic_sound_essence_descriptor_from_caps (ret, caps)) {
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g_object_unref (ret);
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return NULL;
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}
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*handler = mxf_alaw_write_func;
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md = g_new0 (ALawMappingData, 1);
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md->rate = rate;
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md->channels = channels;
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*mapping_data = md;
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return (MXFMetadataFileDescriptor *) ret;
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}
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static void
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mxf_alaw_update_descriptor (MXFMetadataFileDescriptor * d, GstCaps * caps,
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gpointer mapping_data, GstBuffer * buf)
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{
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return;
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}
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static void
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mxf_alaw_get_edit_rate (MXFMetadataFileDescriptor * a, GstCaps * caps,
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gpointer mapping_data, GstBuffer * buf, MXFMetadataSourcePackage * package,
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MXFMetadataTimelineTrack * track, MXFFraction * edit_rate)
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{
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guint i;
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gdouble min = G_MAXDOUBLE;
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ALawMappingData *md = mapping_data;
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for (i = 0; i < package->parent.n_tracks; i++) {
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MXFMetadataTimelineTrack *tmp;
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if (!MXF_IS_METADATA_TIMELINE_TRACK (package->parent.tracks[i]) ||
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package->parent.tracks[i] == (MXFMetadataTrack *) track)
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continue;
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tmp = MXF_METADATA_TIMELINE_TRACK (package->parent.tracks[i]);
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if (((gdouble) tmp->edit_rate.n) / ((gdouble) tmp->edit_rate.d) < min) {
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min = ((gdouble) tmp->edit_rate.n) / ((gdouble) tmp->edit_rate.d);
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memcpy (edit_rate, &tmp->edit_rate, sizeof (MXFFraction));
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}
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}
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if (min == G_MAXDOUBLE) {
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/* 100ms edit units */
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edit_rate->n = 10;
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edit_rate->d = 1;
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}
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memcpy (&md->edit_rate, edit_rate, sizeof (MXFFraction));
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}
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static guint32
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mxf_alaw_get_track_number_template (MXFMetadataFileDescriptor * a,
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GstCaps * caps, gpointer mapping_data)
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{
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return (0x16 << 24) | (0x08 << 8);
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}
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static MXFEssenceElementWriter mxf_alaw_essence_element_writer = {
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mxf_alaw_get_descriptor,
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mxf_alaw_update_descriptor,
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mxf_alaw_get_edit_rate,
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mxf_alaw_get_track_number_template,
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NULL,
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{{0,}}
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};
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#define ALAW_CAPS \
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"audio/x-alaw, " \
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"rate = (int) [ 8000, 192000 ], " \
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"channels = (int) [ 1, 2 ]"
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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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mxf_alaw_essence_element_writer.pad_template =
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gst_pad_template_new ("alaw_audio_sink_%u", GST_PAD_SINK, GST_PAD_REQUEST,
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gst_caps_from_string (ALAW_CAPS));
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memcpy (&mxf_alaw_essence_element_writer.data_definition,
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mxf_metadata_track_identifier_get (MXF_METADATA_TRACK_SOUND_ESSENCE), 16);
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mxf_essence_element_writer_register (&mxf_alaw_essence_element_writer);
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}
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