[audio-opusfile.git] / Opusfile.xs

#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include "ppport.h"

/* op_free is both Perl_op_free and a function in opusfile */
#undef op_free
#include <opus/opusfile.h>

#include "const-c.inc"

typedef OggOpusFile*    Audio__Opusfile;
typedef const OpusHead* Audio__Opusfile__Head;
typedef const OpusTags* Audio__Opusfile__Tags;
typedef const OpusPictureTag* Audio__Opusfile__PictureTag;

MODULE = Audio::Opusfile		PACKAGE = Audio::Opusfile		PREFIX = op_

PROTOTYPES: ENABLE
INCLUDE: const-xs.inc

Audio::Opusfile
op_open_file(path)
	const char *path;
PREINIT:
	int err;
C_ARGS:
	path, &err
POSTCALL:
	if(err)
		croak("op_open_file returned error %d\n", err);

Audio::Opusfile
op_open_memory(const char *data, size_t length(data))
PREINIT:
	int err;
C_ARGS:
	data, XSauto_length_of_data, &err
POSTCALL:
	if(err)
		croak("op_open_memory returned error %d\n", err);

bool
op_test(const char *data, size_t length(data))
PROTOTYPE: $
PREINIT:
	int ret;
CODE:
	ret = op_test (NULL, data, XSauto_length_of_data);
	if(ret < 0 && ret != OP_ENOTFORMAT && ret != OP_EBADHEADER)
		croak("op_test returned error %d\n", RETVAL);
	RETVAL = !ret;
OUTPUT:
	RETVAL


void
DESTROY(of)
	Audio::Opusfile of;
CODE:
	op_free(of);

bool
op_seekable(of)
	Audio::Opusfile of;

int
op_link_count(of)
	Audio::Opusfile of;

int
op_serialno(of, li = -1)
	Audio::Opusfile of;
	int li;

# op_channel_count is not exported; it can be obtained via op_head

long
op_raw_total(of, li = -1)
	Audio::Opusfile of;
	int li;

long
op_pcm_total(of, li = -1)
	Audio::Opusfile of;
	int li;

Audio::Opusfile::Head
op_head(of, li = -1)
	Audio::Opusfile of;
	int li;

Audio::Opusfile::Tags
op_tags(of, li = -1)
	Audio::Opusfile of;
	int li;

# op_current_link not exported until we export the decoding API

int
op_bitrate(of, li = -1)
	Audio::Opusfile of;
	int li;

long
op_bitrate_instant(of)
	Audio::Opusfile of;
POSTCALL:
	if(RETVAL < 0)
		croak("op_bitrate_instant returned error %ld\n", RETVAL);

long
op_raw_tell(of)
	Audio::Opusfile of;
POSTCALL:
	if(RETVAL < 0)
		croak("op_raw_tell returned error %ld\n", RETVAL);

long
op_pcm_tell(of)
	Audio::Opusfile of;
POSTCALL:
	if(RETVAL < 0)
		croak("op_pcm_tell returned error %ld\n", RETVAL);

NO_OUTPUT int
op_raw_seek(of, offset)
	Audio::Opusfile of;
	long offset;
POSTCALL:
	if(RETVAL)
		croak("op_raw_seek returned error %d\n", RETVAL);

NO_OUTPUT int
op_pcm_seek(of, offset)
	Audio::Opusfile of;
	long offset;
POSTCALL:
	if(RETVAL)
		croak("op_pcm_seek returned error %d\n", RETVAL);

NO_OUTPUT int
op_set_gain_offset(of, gain_type, gain_offset_q8)
	Audio::Opusfile of;
	int gain_type;
	int gain_offset_q8;
POSTCALL:
	if(RETVAL)
		croak("op_set_gain_offset returned error %d\n", RETVAL);

void
op_set_dither_enabled(of, enabled)
	Audio::Opusfile of;
	int enabled;


void
op_read(of, bufsize = 1024 * 1024)
	Audio::Opusfile of;
	int bufsize;
PREINIT:
	opus_int16* buf;
	int li, ret, chans, i;
PPCODE:
	Newx(buf, bufsize, opus_int16);
	ret = op_read(of, buf, bufsize, &li);
	if(ret < 0)
		croak("op_read returned error %d\n", ret);
	chans = op_channel_count(of, li);
	EXTEND(SP, chans * ret + 1);
	PUSHs(sv_2mortal(newSViv(li)));
	for(i = 0 ; i < chans * ret ; i++)
		PUSHs(sv_2mortal(newSViv(buf[i])));

void
op_read_float(of, bufsize = 1024 * 1024)
	Audio::Opusfile of;
	int bufsize;
PREINIT:
	float* buf;
	int li, ret, chans, i;
PPCODE:
	Newx(buf, bufsize, float);
	ret = op_read_float(of, buf, bufsize, &li);
	if(ret < 0)
		croak("op_read_float returned error %d\n", ret);
	chans = op_channel_count(of, li);
	EXTEND(SP, chans * ret + 1);
	PUSHs(sv_2mortal(newSViv(li)));
	for(i = 0 ; i < chans * ret ; i++)
		PUSHs(sv_2mortal(newSVnv(buf[i])));

void
op_read_stereo(of, bufsize = 1024 * 1024)
	Audio::Opusfile of;
	int bufsize;
PREINIT:
	opus_int16* buf;
	int ret, i;
PPCODE:
	Newx(buf, bufsize, opus_int16);
	ret = op_read_stereo(of, buf, bufsize);
	if(ret < 0)
		croak("op_read_stereo returned error %d\n", ret);
	EXTEND(SP, 2 * ret);
	for(i = 0 ; i < 2 * ret ; i++)
		PUSHs(sv_2mortal(newSViv(buf[i])));

void
op_read_float_stereo(of, bufsize = 1024 * 1024)
	Audio::Opusfile of;
	int bufsize;
PREINIT:
	float* buf;
	int ret, i;
PPCODE:
	Newx(buf, bufsize, float);
	ret = op_read_float_stereo(of, buf, bufsize);
	if(ret < 0)
		croak("op_read_float_stereo returned error %d\n", ret);
	EXTEND(SP, 2 * ret);
	for(i = 0 ; i < 2 * ret ; i++)
		PUSHs(sv_2mortal(newSVnv(buf[i])));


MODULE = Audio::Opusfile		PACKAGE = Audio::Opusfile::Tags		PREFIX = opus_tags_

int
opus_tags_query_count(tags, tag)
	Audio::Opusfile::Tags tags;
	const char* tag;

const char*
opus_tags_query(tags, tag, count = 0)
	Audio::Opusfile::Tags tags;
	const char* tag;
	int count;

MODULE = Audio::Opusfile		PACKAGE = Audio::Opusfile::PictureTag		PREFIX = opus_picture_tag_

Audio::Opusfile::PictureTag
opus_picture_tag_parse(tag)
	const char *tag;
PREINIT:
	OpusPictureTag *pic;
	int err;
CODE:
	Newx(pic, 1, OpusPictureTag);
	if(err = opus_picture_tag_parse(pic, tag))
		croak("opus_picture_tag_parse returned error %d\n", err);
	RETVAL = pic;
OUTPUT:
	RETVAL

void
DESTROY(pic)
	Audio::Opusfile::PictureTag pic
CODE:
	Safefree(pic);

int
type(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->type;
OUTPUT:
	RETVAL

const char*
mime_type(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->mime_type;
OUTPUT:
	RETVAL

const char*
description(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->description;
OUTPUT:
	RETVAL

int
width(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->width;
OUTPUT:
	RETVAL

int
height(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->height;
OUTPUT:
	RETVAL

int
depth(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->depth;
OUTPUT:
	RETVAL

int
colors(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->colors;
OUTPUT:
	RETVAL

int
data_length(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->data_length;
OUTPUT:
	RETVAL

SV*
data(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = newSVpvn(pic->data, pic->data_length);
OUTPUT:
	RETVAL

int
format(pic)
	Audio::Opusfile::PictureTag pic;
CODE:
	RETVAL = pic->format;
OUTPUT:
	RETVAL

MODULE = Audio::Opusfile		PACKAGE = Audio::Opusfile::Head

int
version(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->version;
OUTPUT:
	RETVAL

int
channel_count(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->channel_count;
OUTPUT:
	RETVAL

unsigned
pre_skip(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->pre_skip;
OUTPUT:
	RETVAL

unsigned
input_sample_rate(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->input_sample_rate;
OUTPUT:
	RETVAL

int
output_gain(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->output_gain;
OUTPUT:
	RETVAL

int
mapping_family(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->mapping_family;
OUTPUT:
	RETVAL

int
stream_count(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->stream_count;
OUTPUT:
	RETVAL

int
coupled_count(head)
	Audio::Opusfile::Head head;
CODE:
	RETVAL = head->coupled_count;
OUTPUT:
	RETVAL

int
mapping(head, k)
	Audio::Opusfile::Head head;
	unsigned k;
CODE:
	if(k >= OPUS_CHANNEL_COUNT_MAX)
		croak("k must be less than %d\n", (int)OPUS_CHANNEL_COUNT_MAX);
	RETVAL = (int) head->mapping[k];
OUTPUT:
	RETVAL
Commit	Line	Data
a3f1cbda MG	1	#define PERL_NO_GET_CONTEXT
	2	#include "EXTERN.h"
	3	#include "perl.h"
	4	#include "XSUB.h"
	5
	6	#include "ppport.h"
	7
	8	/* op_free is both Perl_op_free and a function in opusfile */
	9	#undef op_free
	10	#include <opus/opusfile.h>
	11
	12	#include "const-c.inc"
	13
eed4cab1 MG	14	typedef OggOpusFile* Audio__Opusfile;
	15	typedef const OpusHead* Audio__Opusfile__Head;
	16	typedef const OpusTags* Audio__Opusfile__Tags;
	17	typedef const OpusPictureTag* Audio__Opusfile__PictureTag;
	18
a3f1cbda MG	19	MODULE = Audio::Opusfile PACKAGE = Audio::Opusfile PREFIX = op_
	20
	21	PROTOTYPES: ENABLE
	22	INCLUDE: const-xs.inc
	23
eed4cab1	24	Audio::Opusfile
a3f1cbda MG	25	op_open_file(path)
	26	const char *path;
	27	PREINIT:
	28	int err;
5fbea9a2 MG	29	C_ARGS:
	30	path, &err
	31	POSTCALL:
a3f1cbda MG	32	if(err)
a3f1cbda MG	33	croak("op_open_file returned error %d\n", err);
5fbea9a2	34
eed4cab1	35	Audio::Opusfile
5fbea9a2 MG	36	op_open_memory(const char *data, size_t length(data))
	37	PREINIT:
	38	int err;
	39	C_ARGS:
	40	data, XSauto_length_of_data, &err
	41	POSTCALL:
	42	if(err)
	43	croak("op_open_memory returned error %d\n", err);
	44
	45	bool
	46	op_test(const char *data, size_t length(data))
	47	PROTOTYPE: $
	48	PREINIT:
	49	int ret;
	50	CODE:
	51	ret = op_test (NULL, data, XSauto_length_of_data);
	52	if(ret < 0 && ret != OP_ENOTFORMAT && ret != OP_EBADHEADER)
	53	croak("op_test returned error %d\n", RETVAL);
	54	RETVAL = !ret;
a3f1cbda MG	55	OUTPUT:
	56	RETVAL
	57
5fbea9a2	58
a3f1cbda MG	59	void
a3f1cbda MG	60	DESTROY(of)
eed4cab1	61	Audio::Opusfile of;
a3f1cbda MG	62	CODE:
	63	op_free(of);
	64
5fbea9a2 MG	65	bool
5fbea9a2 MG	66	op_seekable(of)
eed4cab1	67	Audio::Opusfile of;
5fbea9a2 MG	68
	69	int
	70	op_link_count(of)
eed4cab1	71	Audio::Opusfile of;
5fbea9a2 MG	72
	73	int
	74	op_serialno(of, li = -1)
eed4cab1	75	Audio::Opusfile of;
5fbea9a2 MG	76	int li;
5fbea9a2 MG	77
dc986a40 MG	78	# op_channel_count is not exported; it can be obtained via op_head
	79
	80	long
	81	op_raw_total(of, li = -1)
	82	Audio::Opusfile of;
	83	int li;
	84
	85	long
	86	op_pcm_total(of, li = -1)
	87	Audio::Opusfile of;
	88	int li;
	89
eed4cab1	90	Audio::Opusfile::Head
a3f1cbda	91	op_head(of, li = -1)
eed4cab1	92	Audio::Opusfile of;
a3f1cbda MG	93	int li;
a3f1cbda MG	94
eed4cab1	95	Audio::Opusfile::Tags
a3f1cbda	96	op_tags(of, li = -1)
eed4cab1	97	Audio::Opusfile of;
a3f1cbda MG	98	int li;
a3f1cbda MG	99
dc986a40 MG	100	# op_current_link not exported until we export the decoding API
	101
	102	int
	103	op_bitrate(of, li = -1)
	104	Audio::Opusfile of;
	105	int li;
	106
318673cc MG	107	long
	108	op_bitrate_instant(of)
	109	Audio::Opusfile of;
	110	POSTCALL:
	111	if(RETVAL < 0)
	112	croak("op_bitrate_instant returned error %ld\n", RETVAL);
	113
	114	long
	115	op_raw_tell(of)
	116	Audio::Opusfile of;
	117	POSTCALL:
	118	if(RETVAL < 0)
	119	croak("op_raw_tell returned error %ld\n", RETVAL);
	120
	121	long
	122	op_pcm_tell(of)
	123	Audio::Opusfile of;
	124	POSTCALL:
	125	if(RETVAL < 0)
	126	croak("op_pcm_tell returned error %ld\n", RETVAL);
	127
	128	NO_OUTPUT int
	129	op_raw_seek(of, offset)
	130	Audio::Opusfile of;
	131	long offset;
	132	POSTCALL:
	133	if(RETVAL)
	134	croak("op_raw_seek returned error %d\n", RETVAL);
	135
	136	NO_OUTPUT int
	137	op_pcm_seek(of, offset)
	138	Audio::Opusfile of;
	139	long offset;
	140	POSTCALL:
	141	if(RETVAL)
	142	croak("op_pcm_seek returned error %d\n", RETVAL);
	143
	144	NO_OUTPUT int
	145	op_set_gain_offset(of, gain_type, gain_offset_q8)
	146	Audio::Opusfile of;
	147	int gain_type;
	148	int gain_offset_q8;
	149	POSTCALL:
	150	if(RETVAL)
	151	croak("op_set_gain_offset returned error %d\n", RETVAL);
	152
	153	void
	154	op_set_dither_enabled(of, enabled)
	155	Audio::Opusfile of;
	156	int enabled;
	157
	158
	159	void
	160	op_read(of, bufsize = 1024 * 1024)
	161	Audio::Opusfile of;
	162	int bufsize;
	163	PREINIT:
	164	opus_int16* buf;
	165	int li, ret, chans, i;
	166	PPCODE:
	167	Newx(buf, bufsize, opus_int16);
	168	ret = op_read(of, buf, bufsize, &li);
	169	if(ret < 0)
	170	croak("op_read returned error %d\n", ret);
171	chans = op_channel_count(of, li);
172	EXTEND(SP, chans * ret + 1);
173	PUSHs(sv_2mortal(newSViv(li)));
174	for(i = 0 ; i < chans * ret ; i++)
175	PUSHs(sv_2mortal(newSViv(buf[i])));
176
177	void
178	op_read_float(of, bufsize = 1024 * 1024)
179	Audio::Opusfile of;
180	int bufsize;
181	PREINIT:
182	float* buf;
183	int li, ret, chans, i;
184	PPCODE:
185	Newx(buf, bufsize, float);
186	ret = op_read_float(of, buf, bufsize, &li);
187	if(ret < 0)
188	croak("op_read_float returned error %d\n", ret);
189	chans = op_channel_count(of, li);
190	EXTEND(SP, chans * ret + 1);
191	PUSHs(sv_2mortal(newSViv(li)));
192	for(i = 0 ; i < chans * ret ; i++)
193	PUSHs(sv_2mortal(newSVnv(buf[i])));
194
195	void
196	op_read_stereo(of, bufsize = 1024 * 1024)
197	Audio::Opusfile of;
198	int bufsize;
199	PREINIT:
200	opus_int16* buf;
201	int ret, i;
202	PPCODE:
203	Newx(buf, bufsize, opus_int16);
204	ret = op_read_stereo(of, buf, bufsize);
205	if(ret < 0)
206	croak("op_read_stereo returned error %d\n", ret);
207	EXTEND(SP, 2 * ret);
208	for(i = 0 ; i < 2 * ret ; i++)
209	PUSHs(sv_2mortal(newSViv(buf[i])));
210
211	void
212	op_read_float_stereo(of, bufsize = 1024 * 1024)
213	Audio::Opusfile of;
214	int bufsize;
215	PREINIT:
216	float* buf;
217	int ret, i;
218	PPCODE:
219	Newx(buf, bufsize, float);
220	ret = op_read_float_stereo(of, buf, bufsize);
221	if(ret < 0)
222	croak("op_read_float_stereo returned error %d\n", ret);
223	EXTEND(SP, 2 * ret);
224	for(i = 0 ; i < 2 * ret ; i++)
225	PUSHs(sv_2mortal(newSVnv(buf[i])));
226
227
dc986a40	228
a3f1cbda MG	229	MODULE = Audio::Opusfile PACKAGE = Audio::Opusfile::Tags PREFIX = opus_tags_
	230
	231	int
	232	opus_tags_query_count(tags, tag)
eed4cab1	233	Audio::Opusfile::Tags tags;
a3f1cbda MG	234	const char* tag;
	235
	236	const char*
	237	opus_tags_query(tags, tag, count = 0)
eed4cab1	238	Audio::Opusfile::Tags tags;
a3f1cbda MG	239	const char* tag;
a3f1cbda MG	240	int count;
2f4b5b1b MG	241
	242	MODULE = Audio::Opusfile PACKAGE = Audio::Opusfile::PictureTag PREFIX = opus_picture_tag_
	243
eed4cab1	244	Audio::Opusfile::PictureTag
2f4b5b1b MG	245	opus_picture_tag_parse(tag)
	246	const char *tag;
	247	PREINIT:
	248	OpusPictureTag *pic;
	249	int err;
	250	CODE:
	251	Newx(pic, 1, OpusPictureTag);
	252	if(err = opus_picture_tag_parse(pic, tag))
	253	croak("opus_picture_tag_parse returned error %d\n", err);
	254	RETVAL = pic;
	255	OUTPUT:
	256	RETVAL
	257
	258	void
	259	DESTROY(pic)
eed4cab1	260	Audio::Opusfile::PictureTag pic
2f4b5b1b MG	261	CODE:
	262	Safefree(pic);
	263
	264	int
	265	type(pic)
eed4cab1	266	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	267	CODE:
	268	RETVAL = pic->type;
	269	OUTPUT:
	270	RETVAL
	271
	272	const char*
	273	mime_type(pic)
eed4cab1	274	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	275	CODE:
	276	RETVAL = pic->mime_type;
	277	OUTPUT:
	278	RETVAL
	279
	280	const char*
	281	description(pic)
eed4cab1	282	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	283	CODE:
	284	RETVAL = pic->description;
	285	OUTPUT:
	286	RETVAL
	287
	288	int
	289	width(pic)
eed4cab1	290	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	291	CODE:
	292	RETVAL = pic->width;
	293	OUTPUT:
	294	RETVAL
	295
	296	int
	297	height(pic)
eed4cab1	298	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	299	CODE:
	300	RETVAL = pic->height;
	301	OUTPUT:
	302	RETVAL
	303
	304	int
	305	depth(pic)
eed4cab1	306	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	307	CODE:
	308	RETVAL = pic->depth;
	309	OUTPUT:
	310	RETVAL
	311
	312	int
	313	colors(pic)
eed4cab1	314	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	315	CODE:
	316	RETVAL = pic->colors;
	317	OUTPUT:
	318	RETVAL
	319
	320	int
	321	data_length(pic)
eed4cab1	322	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	323	CODE:
	324	RETVAL = pic->data_length;
	325	OUTPUT:
	326	RETVAL
	327
	328	SV*
	329	data(pic)
eed4cab1	330	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	331	CODE:
	332	RETVAL = newSVpvn(pic->data, pic->data_length);
	333	OUTPUT:
	334	RETVAL
	335
	336	int
	337	format(pic)
eed4cab1	338	Audio::Opusfile::PictureTag pic;
2f4b5b1b MG	339	CODE:
	340	RETVAL = pic->format;
	341	OUTPUT:
	342	RETVAL
	343
	344	MODULE = Audio::Opusfile PACKAGE = Audio::Opusfile::Head
	345
	346	int
	347	version(head)
eed4cab1	348	Audio::Opusfile::Head head;
2f4b5b1b MG	349	CODE:
	350	RETVAL = head->version;
	351	OUTPUT:
	352	RETVAL
	353
	354	int
	355	channel_count(head)
eed4cab1	356	Audio::Opusfile::Head head;
2f4b5b1b MG	357	CODE:
	358	RETVAL = head->channel_count;
	359	OUTPUT:
	360	RETVAL
	361
	362	unsigned
	363	pre_skip(head)
eed4cab1	364	Audio::Opusfile::Head head;
2f4b5b1b MG	365	CODE:
	366	RETVAL = head->pre_skip;
	367	OUTPUT:
	368	RETVAL
	369
	370	unsigned
	371	input_sample_rate(head)
eed4cab1	372	Audio::Opusfile::Head head;
2f4b5b1b MG	373	CODE:
	374	RETVAL = head->input_sample_rate;
	375	OUTPUT:
	376	RETVAL
	377
aca25728 MG	378	int
	379	output_gain(head)
	380	Audio::Opusfile::Head head;
	381	CODE:
	382	RETVAL = head->output_gain;
	383	OUTPUT:
	384	RETVAL
	385
2f4b5b1b MG	386	int
2f4b5b1b MG	387	mapping_family(head)
eed4cab1	388	Audio::Opusfile::Head head;
2f4b5b1b MG	389	CODE:
	390	RETVAL = head->mapping_family;
	391	OUTPUT:
	392	RETVAL
	393
	394	int
	395	stream_count(head)
eed4cab1	396	Audio::Opusfile::Head head;
2f4b5b1b MG	397	CODE:
	398	RETVAL = head->stream_count;
	399	OUTPUT:
	400	RETVAL
	401
	402	int
	403	coupled_count(head)
eed4cab1	404	Audio::Opusfile::Head head;
2f4b5b1b MG	405	CODE:
	406	RETVAL = head->coupled_count;
	407	OUTPUT:
	408	RETVAL
	409
	410	int
	411	mapping(head, k)
eed4cab1	412	Audio::Opusfile::Head head;
b6589960	413	unsigned k;
2f4b5b1b	414	CODE:
b6589960 MG	415	if(k >= OPUS_CHANNEL_COUNT_MAX)
b6589960 MG	416	croak("k must be less than %d\n", (int)OPUS_CHANNEL_COUNT_MAX);
2f4b5b1b MG	417	RETVAL = (int) head->mapping[k];
	418	OUTPUT:
	419	RETVAL