aboutsummaryrefslogtreecommitdiffstats
path: root/src/PcmChannels.cxx
blob: 3b100e46f668de044ac5785d11cab25712769747 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "PcmChannels.hxx"
#include "pcm_buffer.h"
#include "PcmUtils.hxx"

#include <assert.h>

static void
pcm_convert_channels_16_1_to_2(int16_t *restrict dest,
			       const int16_t *restrict src,
			       const int16_t *restrict src_end)
{
	while (src < src_end) {
		int16_t value = *src++;

		*dest++ = value;
		*dest++ = value;
	}
}

static void
pcm_convert_channels_16_2_to_1(int16_t *restrict dest,
			       const int16_t *restrict src,
			       const int16_t *restrict src_end)
{
	while (src < src_end) {
		int32_t a = *src++, b = *src++;

		*dest++ = (a + b) / 2;
	}
}

static void
pcm_convert_channels_16_n_to_2(int16_t *restrict dest,
			       unsigned src_channels,
			       const int16_t *restrict src,
			       const int16_t *restrict src_end)
{
	unsigned c;

	assert(src_channels > 0);

	while (src < src_end) {
		int32_t sum = 0;
		int16_t value;

		for (c = 0; c < src_channels; ++c)
			sum += *src++;
		value = sum / (int)src_channels;

		/* XXX this is actually only mono ... */
		*dest++ = value;
		*dest++ = value;
	}
}

const int16_t *
pcm_convert_channels_16(struct pcm_buffer *buffer,
			unsigned dest_channels,
			unsigned src_channels, const int16_t *src,
			size_t src_size, size_t *dest_size_r)
{
	assert(src_size % (sizeof(*src) * src_channels) == 0);

	size_t dest_size = src_size / src_channels * dest_channels;
	*dest_size_r = dest_size;

	int16_t *dest = (int16_t *)pcm_buffer_get(buffer, dest_size);
	const int16_t *src_end = pcm_end_pointer(src, src_size);

	if (src_channels == 1 && dest_channels == 2)
		pcm_convert_channels_16_1_to_2(dest, src, src_end);
	else if (src_channels == 2 && dest_channels == 1)
		pcm_convert_channels_16_2_to_1(dest, src, src_end);
	else if (dest_channels == 2)
		pcm_convert_channels_16_n_to_2(dest, src_channels, src,
					       src_end);
	else
		return NULL;

	return dest;
}

static void
pcm_convert_channels_24_1_to_2(int32_t *restrict dest,
			       const int32_t *restrict src,
			       const int32_t *restrict src_end)
{
	while (src < src_end) {
		int32_t value = *src++;

		*dest++ = value;
		*dest++ = value;
	}
}

static void
pcm_convert_channels_24_2_to_1(int32_t *restrict dest,
			       const int32_t *restrict src,
			       const int32_t *restrict src_end)
{
	while (src < src_end) {
		int32_t a = *src++, b = *src++;

		*dest++ = (a + b) / 2;
	}
}

static void
pcm_convert_channels_24_n_to_2(int32_t *restrict dest,
			       unsigned src_channels,
			       const int32_t *restrict src,
			       const int32_t *restrict src_end)
{
	unsigned c;

	assert(src_channels > 0);

	while (src < src_end) {
		int32_t sum = 0;
		int32_t value;

		for (c = 0; c < src_channels; ++c)
			sum += *src++;
		value = sum / (int)src_channels;

		/* XXX this is actually only mono ... */
		*dest++ = value;
		*dest++ = value;
	}
}

const int32_t *
pcm_convert_channels_24(struct pcm_buffer *buffer,
			unsigned dest_channels,
			unsigned src_channels, const int32_t *src,
			size_t src_size, size_t *dest_size_r)
{
	assert(src_size % (sizeof(*src) * src_channels) == 0);

	size_t dest_size = src_size / src_channels * dest_channels;
	*dest_size_r = dest_size;

	int32_t *dest = (int32_t *)pcm_buffer_get(buffer, dest_size);
	const int32_t *src_end = (const int32_t *)
		pcm_end_pointer(src, src_size);

	if (src_channels == 1 && dest_channels == 2)
		pcm_convert_channels_24_1_to_2(dest, src, src_end);
	else if (src_channels == 2 && dest_channels == 1)
		pcm_convert_channels_24_2_to_1(dest, src, src_end);
	else if (dest_channels == 2)
		pcm_convert_channels_24_n_to_2(dest, src_channels, src,
					       src_end);
	else
		return NULL;

	return dest;
}

static void
pcm_convert_channels_32_1_to_2(int32_t *dest, const int32_t *src,
			       const int32_t *src_end)
{
	pcm_convert_channels_24_1_to_2(dest, src, src_end);
}

static void
pcm_convert_channels_32_2_to_1(int32_t *restrict dest,
			       const int32_t *restrict src,
			       const int32_t *restrict src_end)
{
	while (src < src_end) {
		int64_t a = *src++, b = *src++;

		*dest++ = (a + b) / 2;
	}
}

static void
pcm_convert_channels_32_n_to_2(int32_t *dest,
			       unsigned src_channels, const int32_t *src,
			       const int32_t *src_end)
{
	unsigned c;

	assert(src_channels > 0);

	while (src < src_end) {
		int64_t sum = 0;
		int32_t value;

		for (c = 0; c < src_channels; ++c)
			sum += *src++;
		value = sum / (int64_t)src_channels;

		/* XXX this is actually only mono ... */
		*dest++ = value;
		*dest++ = value;
	}
}

const int32_t *
pcm_convert_channels_32(struct pcm_buffer *buffer,
			unsigned dest_channels,
			unsigned src_channels, const int32_t *src,
			size_t src_size, size_t *dest_size_r)
{
	assert(src_size % (sizeof(*src) * src_channels) == 0);

	size_t dest_size = src_size / src_channels * dest_channels;
	*dest_size_r = dest_size;

	int32_t *dest = (int32_t *)pcm_buffer_get(buffer, dest_size);
	const int32_t *src_end = (const int32_t *)
		pcm_end_pointer(src, src_size);

	if (src_channels == 1 && dest_channels == 2)
		pcm_convert_channels_32_1_to_2(dest, src, src_end);
	else if (src_channels == 2 && dest_channels == 1)
		pcm_convert_channels_32_2_to_1(dest, src, src_end);
	else if (dest_channels == 2)
		pcm_convert_channels_32_n_to_2(dest, src_channels, src,
					       src_end);
	else
		return NULL;

	return dest;
}

static void
pcm_convert_channels_float_1_to_2(float *dest, const float *src,
			       const float *src_end)
{
	pcm_convert_channels_24_1_to_2((int32_t *)dest,
				       (const int32_t *)src,
				       (const int32_t *)src_end);
}

static void
pcm_convert_channels_float_2_to_1(float *restrict dest,
				  const float *restrict src,
				  const float *restrict src_end)
{
	while (src < src_end) {
		double a = *src++, b = *src++;

		*dest++ = (a + b) / 2;
	}
}

static void
pcm_convert_channels_float_n_to_2(float *dest,
				  unsigned src_channels, const float *src,
				  const float *src_end)
{
	unsigned c;

	assert(src_channels > 0);

	while (src < src_end) {
		double sum = 0;
		float value;

		for (c = 0; c < src_channels; ++c)
			sum += *src++;
		value = sum / (double)src_channels;

		/* XXX this is actually only mono ... */
		*dest++ = value;
		*dest++ = value;
	}
}

const float *
pcm_convert_channels_float(struct pcm_buffer *buffer,
			   unsigned dest_channels,
			   unsigned src_channels, const float *src,
			   size_t src_size, size_t *dest_size_r)
{
	assert(src_size % (sizeof(*src) * src_channels) == 0);

	size_t dest_size = src_size / src_channels * dest_channels;
	*dest_size_r = dest_size;

	float *dest = (float *)pcm_buffer_get(buffer, dest_size);
	const float *src_end = (const float *)pcm_end_pointer(src, src_size);

	if (src_channels == 1 && dest_channels == 2)
		pcm_convert_channels_float_1_to_2(dest, src, src_end);
	else if (src_channels == 2 && dest_channels == 1)
		pcm_convert_channels_float_2_to_1(dest, src, src_end);
	else if (dest_channels == 2)
		pcm_convert_channels_float_n_to_2(dest, src_channels, src,
						  src_end);
	else
		return NULL;

	return dest;
}