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gstreamer/gst/wavenc/gstwavenc.c
Tim-Philipp Müller a461b94629 wavenc: miniscule code clean-up 
GST_CLOCK_TIME_NONE is not something that should be used in connection with
GST_FORMAT_BYTES.
2010-09-29 18:53:26 +01:00

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/* -*- mOde: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */
/* GStreamer .wav encoder
* Copyright (C) <2002> Iain Holmes <iain@prettypeople.org>
* Copyright (C) <2006> Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
/**
* SECTION:element-wavenc
*
* Format a audio stream into the wav format.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstwavenc.h"
#include <gst/riff/riff-media.h>
GST_DEBUG_CATEGORY_STATIC (wavenc_debug);
#define GST_CAT_DEFAULT wavenc_debug
struct riff_struct
{
guint8 id[4]; /* RIFF */
guint32 len;
guint8 wav_id[4]; /* WAVE */
};
struct chunk_struct
{
guint8 id[4];
guint32 len;
};
struct common_struct
{
guint16 wFormatTag;
guint16 wChannels;
guint32 dwSamplesPerSec;
guint32 dwAvgBytesPerSec;
guint16 wBlockAlign;
guint16 wBitsPerSample; /* Only for PCM */
};
struct wave_header
{
struct riff_struct riff;
struct chunk_struct format;
struct common_struct common;
struct chunk_struct data;
};
/* FIXME: mono doesn't produce correct files it seems, at least mplayer xruns */
/* Max. of two channels, more channels need WAVFORMATEX with
* channel layout, which we do not support yet */
#define SINK_CAPS \
"audio/x-raw-int, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) [ 1, 2 ], " \
"endianness = (int) LITTLE_ENDIAN, " \
"width = (int) 32, " \
"depth = (int) 32, " \
"signed = (boolean) true" \
"; " \
"audio/x-raw-int, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) [ 1, 2 ], " \
"endianness = (int) LITTLE_ENDIAN, " \
"width = (int) 24, " \
"depth = (int) 24, " \
"signed = (boolean) true" \
"; " \
"audio/x-raw-int, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) [ 1, 2 ], " \
"endianness = (int) LITTLE_ENDIAN, " \
"width = (int) 16, " \
"depth = (int) 16, " \
"signed = (boolean) true" \
"; " \
"audio/x-raw-int, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) [ 1, 2 ], " \
"width = (int) 8, " \
"depth = (int) 8, " \
"signed = (boolean) false" \
"; " \
"audio/x-raw-float, " \
"rate = (int) [ 1, MAX ], " \
"channels = (int) [ 1, 2 ], " \
"endianness = (int) LITTLE_ENDIAN, " \
"width = (int) { 32, 64 }; " \
"audio/x-alaw, " \
"rate = (int) [ 8000, 192000 ], " \
"channels = (int) [ 1, 2 ], " \
"width = (int) 8, " \
"depth = (int) 8, " \
"signed = (boolean) false; " \
"audio/x-mulaw, " \
"rate = (int) [ 8000, 192000 ], " \
"channels = (int) [ 1, 2 ], " \
"width = (int) 8, " \
"depth = (int) 8, " \
"signed = (boolean) false"
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (SINK_CAPS)
);
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-wav")
);
GST_BOILERPLATE (GstWavEnc, gst_wavenc, GstElement, GST_TYPE_ELEMENT);
static GstFlowReturn gst_wavenc_chain (GstPad * pad, GstBuffer * buf);
static gboolean gst_wavenc_event (GstPad * pad, GstEvent * event);
static GstStateChangeReturn gst_wavenc_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_wavenc_sink_setcaps (GstPad * pad, GstCaps * caps);
static void
gst_wavenc_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "WAV audio muxer",
"Codec/Muxer/Audio",
"Encode raw audio into WAV", "Iain Holmes <iain@prettypeople.org>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
GST_DEBUG_CATEGORY_INIT (wavenc_debug, "wavenc", 0, "WAV encoder element");
}
static void
gst_wavenc_class_init (GstWavEncClass * klass)
{
GstElementClass *element_class;
element_class = (GstElementClass *) klass;
element_class->change_state = GST_DEBUG_FUNCPTR (gst_wavenc_change_state);
}
static void
gst_wavenc_init (GstWavEnc * wavenc, GstWavEncClass * klass)
{
wavenc->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");
gst_pad_set_chain_function (wavenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_wavenc_chain));
gst_pad_set_event_function (wavenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_wavenc_event));
gst_pad_set_setcaps_function (wavenc->sinkpad,
GST_DEBUG_FUNCPTR (gst_wavenc_sink_setcaps));
gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->sinkpad);
wavenc->srcpad = gst_pad_new_from_static_template (&src_factory, "src");
gst_pad_use_fixed_caps (wavenc->srcpad);
gst_pad_set_caps (wavenc->srcpad,
gst_static_pad_template_get_caps (&src_factory));
gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->srcpad);
}
#define WAV_HEADER_LEN 44
static GstBuffer *
gst_wavenc_create_header_buf (GstWavEnc * wavenc, guint audio_data_size)
{
struct wave_header wave;
GstBuffer *buf;
guint8 *header;
buf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);
header = GST_BUFFER_DATA (buf);
memset (header, 0, WAV_HEADER_LEN);
wave.common.wChannels = wavenc->channels;
wave.common.wBitsPerSample = wavenc->width;
wave.common.dwSamplesPerSec = wavenc->rate;
/* Fill out our wav-header with some information */
memcpy (wave.riff.id, "RIFF", 4);
wave.riff.len = audio_data_size + WAV_HEADER_LEN - 8;
memcpy (wave.riff.wav_id, "WAVE", 4);
memcpy (wave.format.id, "fmt ", 4);
wave.format.len = 16;
wave.common.wFormatTag = wavenc->format;
wave.common.wBlockAlign = (wavenc->width / 8) * wave.common.wChannels;
wave.common.dwAvgBytesPerSec =
wave.common.wBlockAlign * wave.common.dwSamplesPerSec;
memcpy (wave.data.id, "data", 4);
wave.data.len = audio_data_size;
memcpy (header, (char *) wave.riff.id, 4);
GST_WRITE_UINT32_LE (header + 4, wave.riff.len);
memcpy (header + 8, (char *) wave.riff.wav_id, 4);
memcpy (header + 12, (char *) wave.format.id, 4);
GST_WRITE_UINT32_LE (header + 16, wave.format.len);
GST_WRITE_UINT16_LE (header + 20, wave.common.wFormatTag);
GST_WRITE_UINT16_LE (header + 22, wave.common.wChannels);
GST_WRITE_UINT32_LE (header + 24, wave.common.dwSamplesPerSec);
GST_WRITE_UINT32_LE (header + 28, wave.common.dwAvgBytesPerSec);
GST_WRITE_UINT16_LE (header + 32, wave.common.wBlockAlign);
GST_WRITE_UINT16_LE (header + 34, wave.common.wBitsPerSample);
memcpy (header + 36, (char *) wave.data.id, 4);
GST_WRITE_UINT32_LE (header + 40, wave.data.len);
gst_buffer_set_caps (buf, GST_PAD_CAPS (wavenc->srcpad));
return buf;
}
static GstFlowReturn
gst_wavenc_push_header (GstWavEnc * wavenc, guint audio_data_size)
{
GstFlowReturn ret;
GstBuffer *outbuf;
/* seek to beginning of file */
gst_pad_push_event (wavenc->srcpad,
gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES, 0, -1, 0));
GST_DEBUG_OBJECT (wavenc, "writing header with datasize=%u", audio_data_size);
outbuf = gst_wavenc_create_header_buf (wavenc, audio_data_size);
GST_BUFFER_OFFSET (outbuf) = 0;
ret = gst_pad_push (wavenc->srcpad, outbuf);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (wavenc, "push header failed: flow = %s",
gst_flow_get_name (ret));
}
return ret;
}
static gboolean
gst_wavenc_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstWavEnc *wavenc;
GstStructure *structure;
const gchar *name;
gint chans, rate, width;
wavenc = GST_WAVENC (gst_pad_get_parent (pad));
if (wavenc->sent_header) {
GST_WARNING_OBJECT (wavenc, "cannot change format in middle of stream");
goto fail;
}
GST_DEBUG_OBJECT (wavenc, "got caps: %" GST_PTR_FORMAT, caps);
structure = gst_caps_get_structure (caps, 0);
name = gst_structure_get_name (structure);
if (!gst_structure_get_int (structure, "channels", &chans) ||
!gst_structure_get_int (structure, "rate", &rate)) {
GST_WARNING_OBJECT (wavenc, "caps incomplete");
goto fail;
}
if (strcmp (name, "audio/x-raw-int") == 0) {
if (!gst_structure_get_int (structure, "width", &width)) {
GST_WARNING_OBJECT (wavenc, "caps incomplete");
goto fail;
}
wavenc->format = GST_RIFF_WAVE_FORMAT_PCM;
wavenc->width = width;
} else if (strcmp (name, "audio/x-raw-float") == 0) {
if (!gst_structure_get_int (structure, "width", &width)) {
GST_WARNING_OBJECT (wavenc, "caps incomplete");
goto fail;
}
wavenc->format = GST_RIFF_WAVE_FORMAT_IEEE_FLOAT;
wavenc->width = width;
} else if (strcmp (name, "audio/x-alaw") == 0) {
wavenc->format = GST_RIFF_WAVE_FORMAT_ALAW;
wavenc->width = 8;
} else if (strcmp (name, "audio/x-mulaw") == 0) {
wavenc->format = GST_RIFF_WAVE_FORMAT_MULAW;
wavenc->width = 8;
} else {
GST_WARNING_OBJECT (wavenc, "Unsupported format %s", name);
goto fail;
}
wavenc->channels = chans;
wavenc->rate = rate;
GST_LOG_OBJECT (wavenc,
"accepted caps: format=0x%04x chans=%u width=%u rate=%u",
wavenc->format, wavenc->channels, wavenc->width, wavenc->rate);
gst_object_unref (wavenc);
return TRUE;
fail:
gst_object_unref (wavenc);
return FALSE;
}
#if 0
static struct _maps
{
const guint32 id;
const gchar *name;
} maps[] = {
{
GST_RIFF_INFO_IARL, "Location"}, {
GST_RIFF_INFO_IART, "Artist"}, {
GST_RIFF_INFO_ICMS, "Commissioner"}, {
GST_RIFF_INFO_ICMT, "Comment"}, {
GST_RIFF_INFO_ICOP, "Copyright"}, {
GST_RIFF_INFO_ICRD, "Creation Date"}, {
GST_RIFF_INFO_IENG, "Engineer"}, {
GST_RIFF_INFO_IGNR, "Genre"}, {
GST_RIFF_INFO_IKEY, "Keywords"}, {
GST_RIFF_INFO_INAM, "Title"}, {
GST_RIFF_INFO_IPRD, "Product"}, {
GST_RIFF_INFO_ISBJ, "Subject"}, {
GST_RIFF_INFO_ISFT, "Software"}, {
GST_RIFF_INFO_ITCH, "Technician"}
};
static guint32
get_id_from_name (const char *name)
{
int i;
for (i = 0; i < G_N_ELEMENTS (maps); i++) {
if (strcasecmp (maps[i].name, name) == 0) {
return maps[i].id;
}
}
return 0;
}
static void
write_metadata (GstWavEnc * wavenc)
{
GString *info_str;
GList *props;
int total = 4;
gboolean need_to_write = FALSE;
info_str = g_string_new ("LIST INFO");
for (props = wavenc->metadata->properties->properties; props;
props = props->next) {
GstPropsEntry *entry = props->data;
const char *name;
guint32 id;
name = gst_props_entry_get_name (entry);
id = get_id_from_name (name);
if (id != 0) {
const char *text;
char *tmp;
int len, req, i;
need_to_write = TRUE; /* We've got at least one entry */
gst_props_entry_get_string (entry, &text);
len = strlen (text) + 1; /* The length in the file includes the \0 */
tmp = g_strdup_printf ("%" GST_FOURCC_FORMAT "%d%s", GST_FOURCC_ARGS (id),
GUINT32_TO_LE (len), text);
g_string_append (info_str, tmp);
g_free (tmp);
/* Check that we end on an even boundary */
req = ((len + 8) + 1) & ~1;
for (i = 0; i < req - len; i++) {
g_string_append_printf (info_str, "%c", 0);
}
total += req;
}
}
if (need_to_write) {
GstBuffer *buf;
/* Now we've got all the strings together, we can write our length in */
info_str->str[4] = GUINT32_TO_LE (total);
buf = gst_buffer_new ();
gst_buffer_set_data (buf, info_str->str, info_str->len);
gst_pad_push (wavenc->srcpad, GST_DATA (buf));
g_string_free (info_str, FALSE);
}
}
static void
write_cues (GstWavEnc * wavenc)
{
GString *cue_string, *point_string;
GstBuffer *buf;
GList *cue_list, *c;
int num_cues, total = 4;
if (gst_props_get (wavenc->metadata->properties,
"cues", &cue_list, NULL) == FALSE) {
/* No cues, move along please, nothing to see here */
return;
}
/* Space for 'cue ', chunk size and number of cuepoints */
cue_string = g_string_new ("cue ");
#define CUEPOINT_SIZE 24
point_string = g_string_sized_new (CUEPOINT_SIZE);
for (c = cue_list, num_cues = 0; c; c = c->next, num_cues++) {
GstCaps *cue_caps = c->data;
guint32 pos;
gst_props_get (cue_caps->properties, "position", &pos, NULL);
point_string->str[0] = GUINT32_TO_LE (num_cues + 1);
point_string->str[4] = GUINT32_TO_LE (0);
/* Fixme: There is probably a macro for this */
point_string->str[8] = 'd';
point_string->str[9] = 'a';
point_string->str[10] = 't';
point_string->str[11] = 'a';
point_string->str[12] = GUINT32_TO_LE (0);
point_string->str[16] = GUINT32_TO_LE (0);
point_string->str[20] = GUINT32_TO_LE (pos);
total += CUEPOINT_SIZE;
}
/* Set the length and chunk size */
cue_string->str[4] = GUINT32_TO_LE (total);
cue_string->str[8] = GUINT32_TO_LE (num_cues);
/* Stick the cue points on the end */
g_string_append (cue_string, point_string->str);
g_string_free (point_string, TRUE);
buf = gst_buffer_new ();
gst_buffer_set_data (buf, cue_string->str, cue_string->len);
gst_pad_push (wavenc->srcpad, GST_DATA (buf));
g_string_free (cue_string, FALSE);
}
static void
write_labels (GstWavEnc * wavenc)
{
GstBuffer *buf;
GString *info_str;
int total = 4;
GList *caps;
info_str = g_string_new ("LIST adtl");
if (gst_props_get (wavenc->metadata->properties, "ltxts", &caps, NULL)) {
GList *p;
int i;
for (p = caps, i = 1; p; p = p->next, i++) {
GstCaps *ltxt_caps = p->data;
GString *ltxt;
char *label = NULL;
int len, req, j;
gst_props_get (ltxt_caps->properties, "name", &label, NULL);
len = strlen (label);
#define LTXT_SIZE 28
ltxt = g_string_new ("ltxt ");
ltxt->str[8] = GUINT32_TO_LE (i); /* Identifier */
ltxt->str[12] = GUINT32_TO_LE (0); /* Sample Length */
ltxt->str[16] = GUINT32_TO_LE (0); /* FIXME: Don't save the purpose yet */
ltxt->str[20] = GUINT16_TO_LE (0); /* Country */
ltxt->str[22] = GUINT16_TO_LE (0); /* Language */
ltxt->str[24] = GUINT16_TO_LE (0); /* Dialect */
ltxt->str[26] = GUINT16_TO_LE (0); /* Code Page */
g_string_append (ltxt, label);
g_free (label);
len += LTXT_SIZE;
ltxt->str[4] = GUINT32_TO_LE (len);
/* Check that we end on an even boundary */
req = ((len + 8) + 1) & ~1;
for (j = 0; j < req - len; j++) {
g_string_append_printf (ltxt, "%c", 0);
}
total += req;
g_string_append (info_str, ltxt->str);
g_string_free (ltxt, TRUE);
}
}
if (gst_props_get (wavenc->metadata->properties, "labels", &caps, NULL)) {
GList *p;
int i;
for (p = caps, i = 1; p; p = p->next, i++) {
GstCaps *labl_caps = p->data;
GString *labl;
char *label = NULL;
int len, req, j;
gst_props_get (labl_caps->properties, "name", &label, NULL);
len = strlen (label);
#define LABL_SIZE 4
labl = g_string_new ("labl ");
labl->str[8] = GUINT32_TO_LE (i);
g_string_append (labl, label);
g_free (label);
len += LABL_SIZE;
labl->str[4] = GUINT32_TO_LE (len);
/* Check our size */
req = ((len + 8) + 1) & ~1;
for (j = 0; j < req - len; j++) {
g_string_append_printf (labl, "%c", 0);
}
total += req;
g_string_append (info_str, labl->str);
g_string_free (labl, TRUE);
}
}
if (gst_props_get (wavenc->metadata->properties, "notes", &caps, NULL)) {
GList *p;
int i;
for (p = caps, i = 1; p; p = p->next, i++) {
GstCaps *note_caps = p->data;
GString *note;
char *label = NULL;
int len, req, j;
gst_props_get (note_caps->properties, "name", &label, NULL);
len = strlen (label);
#define NOTE_SIZE 4
note = g_string_new ("note ");
note->str[8] = GUINT32_TO_LE (i);
g_string_append (note, label);
g_free (label);
len += NOTE_SIZE;
note->str[4] = GUINT32_TO_LE (len);
/* Size check */
req = ((len + 8) + 1) & ~1;
for (j = 0; j < req - len; j++) {
g_string_append_printf (note, "%c", 0);
}
total += req;
g_string_append (info_str, note->str);
g_string_free (note, TRUE);
}
}
info_str->str[4] = GUINT32_TO_LE (total);
buf = gst_buffer_new ();
gst_buffer_set_data (buf, info_str->str, info_str->len);
gst_pad_push (wavenc->srcpad, GST_DATA (buf));
g_string_free (info_str, FALSE);
}
#endif
static gboolean
gst_wavenc_event (GstPad * pad, GstEvent * event)
{
gboolean res = TRUE;
GstWavEnc *wavenc;
wavenc = GST_WAVENC (gst_pad_get_parent (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:{
GST_DEBUG_OBJECT (wavenc, "got EOS");
#if 0
/* Write our metadata if we have any */
if (wavenc->metadata) {
write_metadata (wavenc);
write_cues (wavenc);
write_labels (wavenc);
}
#endif
/* write header with correct length values */
gst_wavenc_push_header (wavenc, wavenc->length);
/* we're done with this file */
wavenc->finished_properly = TRUE;
/* and forward the EOS event */
res = gst_pad_event_default (pad, event);
break;
}
case GST_EVENT_NEWSEGMENT:
/* Just drop it, it's probably in TIME format
* anyway. We'll send our own newsegment event */
gst_event_unref (event);
break;
default:
res = gst_pad_event_default (pad, event);
break;
}
gst_object_unref (wavenc);
return res;
}
static GstFlowReturn
gst_wavenc_chain (GstPad * pad, GstBuffer * buf)
{
GstWavEnc *wavenc = GST_WAVENC (GST_PAD_PARENT (pad));
GstFlowReturn flow = GST_FLOW_OK;
g_return_val_if_fail (wavenc->channels > 0, GST_FLOW_WRONG_STATE);
if (!wavenc->sent_header) {
/* use bogus size initially, we'll write the real
* header when we get EOS and know the exact length */
flow = gst_wavenc_push_header (wavenc, 0x7FFF0000);
/* starting a file, means we have to finish it properly */
wavenc->finished_properly = FALSE;
if (flow != GST_FLOW_OK)
return flow;
GST_DEBUG_OBJECT (wavenc, "wrote dummy header");
wavenc->sent_header = TRUE;
}
GST_LOG_OBJECT (wavenc, "pushing %u bytes raw audio, ts=%" GST_TIME_FORMAT,
GST_BUFFER_SIZE (buf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
buf = gst_buffer_make_metadata_writable (buf);
gst_buffer_set_caps (buf, GST_PAD_CAPS (wavenc->srcpad));
GST_BUFFER_OFFSET (buf) = WAV_HEADER_LEN + wavenc->length;
GST_BUFFER_OFFSET_END (buf) = GST_BUFFER_OFFSET_NONE;
wavenc->length += GST_BUFFER_SIZE (buf);
flow = gst_pad_push (wavenc->srcpad, buf);
return flow;
}
static GstStateChangeReturn
gst_wavenc_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstWavEnc *wavenc = GST_WAVENC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
wavenc->format = 0;
wavenc->channels = 0;
wavenc->width = 0;
wavenc->rate = 0;
wavenc->length = 0;
wavenc->sent_header = FALSE;
/* its true because we haven't writen anything */
wavenc->finished_properly = TRUE;
break;
default:
break;
}
ret = parent_class->change_state (element, transition);
if (ret != GST_STATE_CHANGE_SUCCESS)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (!wavenc->finished_properly) {
GST_ELEMENT_WARNING (wavenc, STREAM, MUX,
("Wav stream not finished properly"),
("Wav stream not finished properly, no EOS received "
"before shutdown"));
}
break;
default:
break;
}
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "wavenc", GST_RANK_PRIMARY,
GST_TYPE_WAVENC);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"wavenc",
"Encode raw audio into WAV",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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