rdesktop/trunk/rdpsnd_dsp.c

/*
   rdesktop: A Remote Desktop Protocol client.
   Sound DSP routines
   Copyright (C) Michael Gernoth 2006

   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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "rdesktop.h"
#include "rdpsnd.h"
#include "rdpsnd_dsp.h"

#ifdef HAVE_LIBSAMPLERATE
#include <samplerate.h>

#define SRC_CONVERTER SRC_SINC_MEDIUM_QUALITY
#endif

#define MAX_VOLUME 65535

static uint16 softvol_left = MAX_VOLUME;
static uint16 softvol_right = MAX_VOLUME;
static uint32 resample_to_srate = 44100;
static uint16 resample_to_bitspersample = 16;
static uint16 resample_to_channels = 2;
#ifdef HAVE_LIBSAMPLERATE
static SRC_STATE *src_converter = NULL;
#endif

void
rdpsnd_dsp_softvol_set(uint16 left, uint16 right)
{
        softvol_left = left;
        softvol_right = right;
        DEBUG(("rdpsnd_dsp_softvol_set: left: %u, right: %u\n", left, right));
}

void
rdpsnd_dsp_softvol(unsigned char *buffer, unsigned int size, WAVEFORMATEX * format)
{
        unsigned int factor_left, factor_right;
        unsigned char *posin = buffer;
        unsigned char *posout = buffer;

        if ((softvol_left == MAX_VOLUME) && (softvol_right == MAX_VOLUME))
                return;

        factor_left = (softvol_left * 256) / MAX_VOLUME;
        factor_right = (softvol_right * 256) / MAX_VOLUME;

        if (format->nChannels == 1)
        {
                factor_left = factor_right = (factor_left + factor_right) / 2;
        }

        if (format->wBitsPerSample == 8)
        {
                sint8 val;

                while (posout < buffer + size)
                {
                        /* Left */
                        val = *posin++;
                        val = (val * factor_left) >> 8;
                        *posout++ = val;

                        /* Right */
                        val = *posin++;
                        val = (val * factor_right) >> 8;
                        *posout++ = val;
                }
        }
        else
        {
                sint16 val;

                while (posout < buffer + size)
                {
                        /* Left */
                        val = *posin++;
                        val |= *posin++ << 8;
                        val = (val * factor_left) >> 8;
                        *posout++ = val & 0xff;
                        *posout++ = val >> 8;

                        /* Right */
                        val = *posin++;
                        val |= *posin++ << 8;
                        val = (val * factor_right) >> 8;
                        *posout++ = val & 0xff;
                        *posout++ = val >> 8;
                }
        }

        DEBUG(("using softvol with factors left: %d, right: %d (%d/%d)\n", factor_left,
               factor_right, format->wBitsPerSample, format->nChannels));
}

void
rdpsnd_dsp_swapbytes(unsigned char *buffer, unsigned int size, WAVEFORMATEX * format)
{
        int i;
        uint8 swap;

        if (format->wBitsPerSample == 8)
                return;

        for (i = 0; i < size; i += 2)
        {
                swap = *(buffer + i);
                *(buffer + i) = *(buffer + i + 1);
                *(buffer + i + 1) = swap;
        }
}

BOOL
rdpsnd_dsp_resample_set(uint32 device_srate, uint16 device_bitspersample, uint16 device_channels)
{
#ifdef HAVE_LIBSAMPLERATE
        int err;
#endif

#ifdef HAVE_LIBSAMPLERATE
        if (device_bitspersample != 16)
                return False;
#else
        if (device_srate != 44100 && device_srate != 22050)
                return False;

        if (device_bitspersample != 16 && device_bitspersample != 8)
                return False;
#endif

        if (device_channels != 1 && device_channels != 2)
                return False;

        resample_to_srate = device_srate;
        resample_to_bitspersample = device_bitspersample;
        resample_to_channels = device_channels;

#ifdef HAVE_LIBSAMPLERATE
        if (src_converter != NULL)
                src_converter = src_delete(src_converter);

        if ((src_converter = src_new(SRC_CONVERTER, device_channels, &err)) == NULL)
        {
                warning("src_new failed: %d!\n", err);
                return False;
        }
#endif

        return True;
}

BOOL
rdpsnd_dsp_resample_supported(WAVEFORMATEX * format)
{
        if (format->wFormatTag != WAVE_FORMAT_PCM)
                return False;
        if ((format->nChannels != 1) && (format->nChannels != 2))
                return False;
#ifdef HAVE_LIBSAMPLERATE
        if (format->wBitsPerSample != 16)
                return False;
#else
        if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16))
                return False;
        if ((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050))
                return False;
#endif

        return True;
}

uint32
rdpsnd_dsp_resample(unsigned char **out, unsigned char *in, unsigned int size,
                    WAVEFORMATEX * format, BOOL stream_be)
{
#ifdef HAVE_LIBSAMPLERATE
        SRC_DATA resample_data;
        float *infloat, *outfloat;
        int innum, outnum;
#else
        int offset;
        int i;
#endif
        static BOOL warned = False;
        int samplewidth = format->wBitsPerSample / 8;
        int outsize = 0;

        if ((resample_to_bitspersample == format->wBitsPerSample) &&
            (resample_to_channels == format->nChannels) &&
            (resample_to_srate == format->nSamplesPerSec))
                return 0;

#ifdef B_ENDIAN
        if (!stream_be)
                rdpsnd_dsp_swapbytes(in, size, format)
#endif
                        if ((resample_to_channels != format->nChannels) ||
                            (resample_to_bitspersample != format->wBitsPerSample))
                {
                        warning("unsupported resample-settings (%u -> %u/%u -> %u/%u -> %u), not resampling!\n", format->nSamplesPerSec, resample_to_srate, format->wBitsPerSample, resample_to_bitspersample, format->nChannels, resample_to_channels);
                        warned = True;
                }

#ifdef HAVE_LIBSAMPLERATE
        if (src_converter == NULL)
        {
                warning("no samplerate converter available!!\n");
                return 0;
        }

        innum = size / samplewidth;
        outnum = innum * (resample_to_srate / format->nSamplesPerSec);

        infloat = xmalloc(sizeof(float) * innum);
        outfloat = xmalloc(sizeof(float) * outnum);

        src_short_to_float_array((short *) in, infloat, innum);

        bzero(&resample_data, sizeof(resample_data));
        resample_data.data_in = infloat;
        resample_data.data_out = outfloat;
        resample_data.input_frames = innum / resample_to_channels;
        resample_data.output_frames = outnum / resample_to_channels;
        resample_data.src_ratio = (double) resample_to_srate / (double) format->nSamplesPerSec;
        resample_data.end_of_input = 0;

        src_process(src_converter, &resample_data);
        xfree(infloat);

        outsize = outnum * samplewidth;
        *out = xmalloc(outsize);
        src_float_to_short_array(outfloat, (short *) *out, outnum);
        xfree(outfloat);

#else
        if (format->nSamplesPerSec != 22050)
        {
                if (!warned)
                {
                        warning("unsupported source samplerate (%u), not resampling!\n",
                                format->nSamplesPerSec);
                        warned = True;
                }
                return 0;
        }

        outsize = size * 2;
        *out = xmalloc(outsize);

        /* Resample from 22050 to 44100 */
        for (i = 0; i < (size / samplewidth); i++)
        {
                /* On a stereo-channel we must make sure that left and right
                   does not get mixed up, so we need to expand the sample-
                   data with channels in mind: 1234 -> 12123434
                   If we have a mono-channel, we can expand the data by simply
                   doubling the sample-data: 1234 -> 11223344 */
                if (resample_to_channels == 2)
                        offset = ((i * 2) - (i & 1)) * samplewidth;
                else
                        offset = (i * 2) * samplewidth;

                memcpy(*out + offset, in + (i * samplewidth), samplewidth);
                memcpy(*out + (resample_to_channels * samplewidth + offset),
                       in + (i * samplewidth), samplewidth);

        }
#endif

#ifdef B_ENDIAN
        if (!stream_be)
                rdpsnd_dsp_swapbytes(*out, outsize, format)
#endif
                        return outsize;
}

STREAM
rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
{
        static struct stream out;
        BOOL stream_be = False;

        /* softvol and byteswap do not change the amount of data they
           return, so they can operate on the input-stream */
        if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
                rdpsnd_dsp_softvol(s->data, s->size, format);

#ifdef B_ENDIAN
        if (current_driver->need_byteswap_on_be)
        {
                rdpsnd_dsp_swapbytes(s->data, s->size, format);
                stream_be = True;
        }
#endif

        out.data = NULL;

        if (current_driver->wave_out_format_supported == rdpsnd_dsp_resample_supported)
                out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format, stream_be);

        if (out.data == NULL)
        {
                out.data = xmalloc(s->size);
                memcpy(out.data, s->data, s->size);
                out.size = s->size;
        }

        out.p = out.data;
        out.end = out.p + out.size;

        return &out;
}
1	/*
2	rdesktop: A Remote Desktop Protocol client.
3	Sound DSP routines
4	Copyright (C) Michael Gernoth 2006
5
6	This program is free software; you can redistribute it and/or modify
7	it under the terms of the GNU General Public License as published by
8	the Free Software Foundation; either version 2 of the License, or
9	(at your option) any later version.
10
11	This program is distributed in the hope that it will be useful,
12	but WITHOUT ANY WARRANTY; without even the implied warranty of
13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	GNU General Public License for more details.
15
16	You should have received a copy of the GNU General Public License
17	along with this program; if not, write to the Free Software
18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19	*/
20
21	#include "rdesktop.h"
22	#include "rdpsnd.h"
23	#include "rdpsnd_dsp.h"
24
25	#ifdef HAVE_LIBSAMPLERATE
26	#include <samplerate.h>
27
28	#define SRC_CONVERTER SRC_SINC_MEDIUM_QUALITY
29	#endif
30
31	#define MAX_VOLUME 65535
32
33	static uint16 softvol_left = MAX_VOLUME;
34	static uint16 softvol_right = MAX_VOLUME;
35	static uint32 resample_to_srate = 44100;
36	static uint16 resample_to_bitspersample = 16;
37	static uint16 resample_to_channels = 2;
38	#ifdef HAVE_LIBSAMPLERATE
39	static SRC_STATE *src_converter = NULL;
40	#endif
41
42	void
43	rdpsnd_dsp_softvol_set(uint16 left, uint16 right)
44	{
45	softvol_left = left;
46	softvol_right = right;
47	DEBUG(("rdpsnd_dsp_softvol_set: left: %u, right: %u\n", left, right));
48	}
49
50	void
51	rdpsnd_dsp_softvol(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
52	{
53	unsigned int factor_left, factor_right;
54	unsigned char *posin = buffer;
55	unsigned char *posout = buffer;
56
57	if ((softvol_left == MAX_VOLUME) && (softvol_right == MAX_VOLUME))
58	return;
59
60	factor_left = (softvol_left * 256) / MAX_VOLUME;
61	factor_right = (softvol_right * 256) / MAX_VOLUME;
62
63	if (format->nChannels == 1)
64	{
65	factor_left = factor_right = (factor_left + factor_right) / 2;
66	}
67
68	if (format->wBitsPerSample == 8)
69	{
70	sint8 val;
71
72	while (posout < buffer + size)
73	{
74	/* Left */
75	val = *posin++;
76	val = (val * factor_left) >> 8;
77	*posout++ = val;
78
79	/* Right */
80	val = *posin++;
81	val = (val * factor_right) >> 8;
82	*posout++ = val;
83	}
84	}
85	else
86	{
87	sint16 val;
88
89	while (posout < buffer + size)
90	{
91	/* Left */
92	val = *posin++;
93	val \|= *posin++ << 8;
94	val = (val * factor_left) >> 8;
95	*posout++ = val & 0xff;
96	*posout++ = val >> 8;
97
98	/* Right */
99	val = *posin++;
100	val \|= *posin++ << 8;
101	val = (val * factor_right) >> 8;
102	*posout++ = val & 0xff;
103	*posout++ = val >> 8;
104	}
105	}
106
107	DEBUG(("using softvol with factors left: %d, right: %d (%d/%d)\n", factor_left,
108	factor_right, format->wBitsPerSample, format->nChannels));
109	}
110
111	void
112	rdpsnd_dsp_swapbytes(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
113	{
114	int i;
115	uint8 swap;
116
117	if (format->wBitsPerSample == 8)
118	return;
119
120	for (i = 0; i < size; i += 2)
121	{
122	swap = *(buffer + i);
123	(buffer + i) = (buffer + i + 1);
124	*(buffer + i + 1) = swap;
125	}
126	}
127
128	BOOL
129	rdpsnd_dsp_resample_set(uint32 device_srate, uint16 device_bitspersample, uint16 device_channels)
130	{
131	#ifdef HAVE_LIBSAMPLERATE
132	int err;
133	#endif
134
135	#ifdef HAVE_LIBSAMPLERATE
136	if (device_bitspersample != 16)
137	return False;
138	#else
139	if (device_srate != 44100 && device_srate != 22050)
140	return False;
141
142	if (device_bitspersample != 16 && device_bitspersample != 8)
143	return False;
144	#endif
145
146	if (device_channels != 1 && device_channels != 2)
147	return False;
148
149	resample_to_srate = device_srate;
150	resample_to_bitspersample = device_bitspersample;
151	resample_to_channels = device_channels;
152
153	#ifdef HAVE_LIBSAMPLERATE
154	if (src_converter != NULL)
155	src_converter = src_delete(src_converter);
156
157	if ((src_converter = src_new(SRC_CONVERTER, device_channels, &err)) == NULL)
158	{
159	warning("src_new failed: %d!\n", err);
160	return False;
161	}
162	#endif
163
164	return True;
165	}
166
167	BOOL
168	rdpsnd_dsp_resample_supported(WAVEFORMATEX * format)
169	{
170	if (format->wFormatTag != WAVE_FORMAT_PCM)
171	return False;
172	if ((format->nChannels != 1) && (format->nChannels != 2))
173	return False;
174	#ifdef HAVE_LIBSAMPLERATE
175	if (format->wBitsPerSample != 16)
176	return False;
177	#else
178	if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16))
179	return False;
180	if ((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050))
181	return False;
182	#endif
183
184	return True;
185	}
186
187	uint32
188	rdpsnd_dsp_resample(unsigned char *out, unsigned char in, unsigned int size,
189	WAVEFORMATEX * format, BOOL stream_be)
190	{
191	#ifdef HAVE_LIBSAMPLERATE
192	SRC_DATA resample_data;
193	float infloat, outfloat;
194	int innum, outnum;
195	#else
196	int offset;
197	int i;
198	#endif
199	static BOOL warned = False;
200	int samplewidth = format->wBitsPerSample / 8;
201	int outsize = 0;
202
203	if ((resample_to_bitspersample == format->wBitsPerSample) &&
204	(resample_to_channels == format->nChannels) &&
205	(resample_to_srate == format->nSamplesPerSec))
206	return 0;
207
208	#ifdef B_ENDIAN
209	if (!stream_be)
210	rdpsnd_dsp_swapbytes(in, size, format)
211	#endif
212	if ((resample_to_channels != format->nChannels) \|\|
213	(resample_to_bitspersample != format->wBitsPerSample))
214	{
215	warning("unsupported resample-settings (%u -> %u/%u -> %u/%u -> %u), not resampling!\n", format->nSamplesPerSec, resample_to_srate, format->wBitsPerSample, resample_to_bitspersample, format->nChannels, resample_to_channels);
216	warned = True;
217	}
218
219	#ifdef HAVE_LIBSAMPLERATE
220	if (src_converter == NULL)
221	{
222	warning("no samplerate converter available!!\n");
223	return 0;
224	}
225
226	innum = size / samplewidth;
227	outnum = innum * (resample_to_srate / format->nSamplesPerSec);
228
229	infloat = xmalloc(sizeof(float) * innum);
230	outfloat = xmalloc(sizeof(float) * outnum);
231
232	src_short_to_float_array((short *) in, infloat, innum);
233
234	bzero(&resample_data, sizeof(resample_data));
235	resample_data.data_in = infloat;
236	resample_data.data_out = outfloat;
237	resample_data.input_frames = innum / resample_to_channels;
238	resample_data.output_frames = outnum / resample_to_channels;
239	resample_data.src_ratio = (double) resample_to_srate / (double) format->nSamplesPerSec;
240	resample_data.end_of_input = 0;
241
242	src_process(src_converter, &resample_data);
243	xfree(infloat);
244
245	outsize = outnum * samplewidth;
246	*out = xmalloc(outsize);
247	src_float_to_short_array(outfloat, (short ) out, outnum);
248	xfree(outfloat);
249
250	#else
251	if (format->nSamplesPerSec != 22050)
252	{
253	if (!warned)
254	{
255	warning("unsupported source samplerate (%u), not resampling!\n",
256	format->nSamplesPerSec);
257	warned = True;
258	}
259	return 0;
260	}
261
262	outsize = size * 2;
263	*out = xmalloc(outsize);
264
265	/* Resample from 22050 to 44100 */
266	for (i = 0; i < (size / samplewidth); i++)
267	{
268	/* On a stereo-channel we must make sure that left and right
269	does not get mixed up, so we need to expand the sample-
270	data with channels in mind: 1234 -> 12123434
271	If we have a mono-channel, we can expand the data by simply
272	doubling the sample-data: 1234 -> 11223344 */
273	if (resample_to_channels == 2)
274	offset = ((i * 2) - (i & 1)) * samplewidth;
275	else
276	offset = (i * 2) * samplewidth;
277
278	memcpy(out + offset, in + (i samplewidth), samplewidth);
279	memcpy(out + (resample_to_channels samplewidth + offset),
280	in + (i * samplewidth), samplewidth);
281
282	}
283	#endif
284
285	#ifdef B_ENDIAN
286	if (!stream_be)
287	rdpsnd_dsp_swapbytes(*out, outsize, format)
288	#endif
289	return outsize;
290	}
291
292	STREAM
293	rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
294	{
295	static struct stream out;
296	BOOL stream_be = False;
297
298	/* softvol and byteswap do not change the amount of data they
299	return, so they can operate on the input-stream */
300	if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
301	rdpsnd_dsp_softvol(s->data, s->size, format);
302
303	#ifdef B_ENDIAN
304	if (current_driver->need_byteswap_on_be)
305	{
306	rdpsnd_dsp_swapbytes(s->data, s->size, format);
307	stream_be = True;
308	}
309	#endif
310
311	out.data = NULL;
312
313	if (current_driver->wave_out_format_supported == rdpsnd_dsp_resample_supported)
314	out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format, stream_be);
315
316	if (out.data == NULL)
317	{
318	out.data = xmalloc(s->size);
319	memcpy(out.data, s->data, s->size);
320	out.size = s->size;
321	}
322
323	out.p = out.data;
324	out.end = out.p + out.size;
325
326	return &out;
327	}