trunk/rdesktop/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

#ifndef HAVE_LIBSAMPLERATE
        if (device_srate != 44100 && device_srate != 22050)
                return False;
#endif

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

        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;
        if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16))
                return False;
#ifndef HAVE_LIBSAMPLERATE
        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;
#endif
        static BOOL warned = False;
        unsigned char *tmpdata = NULL;
        int samplewidth = format->wBitsPerSample / 8;
        int outsize = 0;
        int i;

        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

        /* Expand 8bit input-samples to 16bit */
#ifndef HAVE_LIBSAMPLERATE      /* libsamplerate needs 16bit samples */
        if (format->wBitsPerSample != resample_to_bitspersample)
#endif
        {
                /* source: 8 bit, dest: 16bit */
                if (format->wBitsPerSample == 8)
                {
                        tmpdata = xmalloc(size * 2);
                        for (i = 0; i < size; i++)
                        {
                                tmpdata[i * 2] = in[i];
                                tmpdata[(i * 2) + 1] = 0x00;
                        }
                        in = tmpdata;
                        samplewidth = 16 / 2;
                        size *= 2;
                }
        }

        if (resample_to_channels != format->nChannels)
        {
                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;
        }

        /* Do the resampling */
#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

        if (tmpdata != NULL)
                xfree(tmpdata);

        /* Shrink 16bit output-samples to 8bit */
#ifndef HAVE_LIBSAMPLERATE      /* libsamplerate produces 16bit samples */
        if (format->wBitsPerSample != resample_to_bitspersample)
#endif
        {
                /* source: 16 bit, dest: 8 bit */
                if (resample_to_bitspersample == 8)
                {
                        for (i = 0; i < outsize; i++)
                        {
                                *out[i] = *out[i * 2];
                        }
                        outsize /= 2;
                }
        }

#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->need_resampling)
                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	stargo	1258	/*
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	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
26			#include <samplerate.h>
27
28			#define SRC_CONVERTER SRC_SINC_MEDIUM_QUALITY
29			#endif
30
31	stargo	1258	#define MAX_VOLUME 65535
32
33			static uint16 softvol_left = MAX_VOLUME;
34			static uint16 softvol_right = MAX_VOLUME;
35	stargo	1276	static uint32 resample_to_srate = 44100;
36			static uint16 resample_to_bitspersample = 16;
37			static uint16 resample_to_channels = 2;
38	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
39			static SRC_STATE *src_converter = NULL;
40			#endif
41	stargo	1258
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	stargo	1260	void
51	stargo	1259	rdpsnd_dsp_softvol(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
52	stargo	1258	{
53			unsigned int factor_left, factor_right;
54	stargo	1259	unsigned char *posin = buffer;
55			unsigned char *posout = buffer;
56	stargo	1258
57	stargo	1259	if ((softvol_left == MAX_VOLUME) && (softvol_right == MAX_VOLUME))
58			return;
59
60	stargo	1270	factor_left = (softvol_left * 256) / MAX_VOLUME;
61			factor_right = (softvol_right * 256) / MAX_VOLUME;
62	stargo	1258
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	stargo	1262	sint8 val;
71	stargo	1258
72	stargo	1259	while (posout < buffer + size)
73	stargo	1258	{
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	stargo	1262	sint16 val;
88	stargo	1258
89	stargo	1259	while (posout < buffer + size)
90	stargo	1258	{
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	stargo	1263	DEBUG(("using softvol with factors left: %d, right: %d (%d/%d)\n", factor_left,
108			factor_right, format->wBitsPerSample, format->nChannels));
109	stargo	1258	}
110
111	stargo	1260	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	stargo	1276	BOOL
129			rdpsnd_dsp_resample_set(uint32 device_srate, uint16 device_bitspersample, uint16 device_channels)
130			{
131	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
132			int err;
133			#endif
134
135	stargo	1281	#ifndef HAVE_LIBSAMPLERATE
136	stargo	1276	if (device_srate != 44100 && device_srate != 22050)
137			return False;
138	stargo	1281	#endif
139	stargo	1263
140	stargo	1276	if (device_bitspersample != 16 && device_bitspersample != 8)
141			return False;
142
143			if (device_channels != 1 && device_channels != 2)
144			return False;
145
146			resample_to_srate = device_srate;
147			resample_to_bitspersample = device_bitspersample;
148			resample_to_channels = device_channels;
149
150	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
151			if (src_converter != NULL)
152			src_converter = src_delete(src_converter);
153
154			if ((src_converter = src_new(SRC_CONVERTER, device_channels, &err)) == NULL)
155			{
156			warning("src_new failed: %d!\n", err);
157			return False;
158			}
159			#endif
160
161	stargo	1276	return True;
162			}
163
164			BOOL
165			rdpsnd_dsp_resample_supported(WAVEFORMATEX * format)
166			{
167			if (format->wFormatTag != WAVE_FORMAT_PCM)
168			return False;
169			if ((format->nChannels != 1) && (format->nChannels != 2))
170			return False;
171			if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16))
172			return False;
173	stargo	1281	#ifndef HAVE_LIBSAMPLERATE
174	stargo	1276	if ((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050))
175			return False;
176	stargo	1278	#endif
177	stargo	1276
178			return True;
179			}
180
181			uint32
182			rdpsnd_dsp_resample(unsigned char *out, unsigned char in, unsigned int size,
183	stargo	1278	WAVEFORMATEX * format, BOOL stream_be)
184	stargo	1276	{
185	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
186			SRC_DATA resample_data;
187			float infloat, outfloat;
188			int innum, outnum;
189			#else
190			int offset;
191			#endif
192	stargo	1276	static BOOL warned = False;
193	stargo	1281	unsigned char *tmpdata = NULL;
194	stargo	1276	int samplewidth = format->wBitsPerSample / 8;
195	stargo	1278	int outsize = 0;
196	stargo	1281	int i;
197	stargo	1276
198	stargo	1277	if ((resample_to_bitspersample == format->wBitsPerSample) &&
199			(resample_to_channels == format->nChannels) &&
200			(resample_to_srate == format->nSamplesPerSec))
201			return 0;
202
203	stargo	1278	#ifdef B_ENDIAN
204			if (!stream_be)
205	stargo	1281	rdpsnd_dsp_swapbytes(in, size, format);
206	stargo	1278	#endif
207	stargo	1281
208			/* Expand 8bit input-samples to 16bit */
209			#ifndef HAVE_LIBSAMPLERATE /* libsamplerate needs 16bit samples */
210			if (format->wBitsPerSample != resample_to_bitspersample)
211			#endif
212			{
213			/* source: 8 bit, dest: 16bit */
214			if (format->wBitsPerSample == 8)
215	stargo	1278	{
216	stargo	1281	tmpdata = xmalloc(size * 2);
217			for (i = 0; i < size; i++)
218			{
219			tmpdata[i * 2] = in[i];
220			tmpdata[(i * 2) + 1] = 0x00;
221			}
222			in = tmpdata;
223			samplewidth = 16 / 2;
224			size *= 2;
225	stargo	1278	}
226	stargo	1281	}
227	stargo	1278
228	stargo	1281	if (resample_to_channels != format->nChannels)
229			{
230			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);
231			warned = True;
232			}
233
234			/* Do the resampling */
235	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
236			if (src_converter == NULL)
237	stargo	1276	{
238	stargo	1278	warning("no samplerate converter available!!\n");
239			return 0;
240			}
241
242			innum = size / samplewidth;
243			outnum = innum * (resample_to_srate / format->nSamplesPerSec);
244
245			infloat = xmalloc(sizeof(float) * innum);
246			outfloat = xmalloc(sizeof(float) * outnum);
247
248			src_short_to_float_array((short *) in, infloat, innum);
249
250			bzero(&resample_data, sizeof(resample_data));
251			resample_data.data_in = infloat;
252			resample_data.data_out = outfloat;
253			resample_data.input_frames = innum / resample_to_channels;
254			resample_data.output_frames = outnum / resample_to_channels;
255			resample_data.src_ratio = (double) resample_to_srate / (double) format->nSamplesPerSec;
256			resample_data.end_of_input = 0;
257
258			src_process(src_converter, &resample_data);
259			xfree(infloat);
260
261			outsize = outnum * samplewidth;
262			*out = xmalloc(outsize);
263			src_float_to_short_array(outfloat, (short ) out, outnum);
264			xfree(outfloat);
265
266			#else
267			if (format->nSamplesPerSec != 22050)
268			{
269	stargo	1276	if (!warned)
270			{
271	stargo	1278	warning("unsupported source samplerate (%u), not resampling!\n",
272			format->nSamplesPerSec);
273	stargo	1276	warned = True;
274			}
275			return 0;
276			}
277
278	stargo	1277	outsize = size * 2;
279			*out = xmalloc(outsize);
280
281			/* Resample from 22050 to 44100 */
282			for (i = 0; i < (size / samplewidth); i++)
283	stargo	1276	{
284	stargo	1277	/* On a stereo-channel we must make sure that left and right
285			does not get mixed up, so we need to expand the sample-
286			data with channels in mind: 1234 -> 12123434
287			If we have a mono-channel, we can expand the data by simply
288			doubling the sample-data: 1234 -> 11223344 */
289			if (resample_to_channels == 2)
290			offset = ((i * 2) - (i & 1)) * samplewidth;
291			else
292			offset = (i * 2) * samplewidth;
293	stargo	1276
294	stargo	1277	memcpy(out + offset, in + (i samplewidth), samplewidth);
295			memcpy(out + (resample_to_channels samplewidth + offset),
296			in + (i * samplewidth), samplewidth);
297	stargo	1276
298			}
299	stargo	1278	#endif
300	stargo	1276
301	stargo	1281	if (tmpdata != NULL)
302			xfree(tmpdata);
303
304			/* Shrink 16bit output-samples to 8bit */
305			#ifndef HAVE_LIBSAMPLERATE /* libsamplerate produces 16bit samples */
306			if (format->wBitsPerSample != resample_to_bitspersample)
307			#endif
308			{
309			/* source: 16 bit, dest: 8 bit */
310			if (resample_to_bitspersample == 8)
311			{
312			for (i = 0; i < outsize; i++)
313			{
314			out[i] = out[i * 2];
315			}
316			outsize /= 2;
317			}
318			}
319
320	stargo	1278	#ifdef B_ENDIAN
321			if (!stream_be)
322	stargo	1281	rdpsnd_dsp_swapbytes(*out, outsize, format);
323	stargo	1278	#endif
324	stargo	1281	return outsize;
325	stargo	1276	}
326
327	stargo	1263	STREAM
328	stargo	1276	rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
329	stargo	1258	{
330	stargo	1263	static struct stream out;
331	stargo	1278	BOOL stream_be = False;
332	stargo	1258
333	stargo	1263	/* softvol and byteswap do not change the amount of data they
334			return, so they can operate on the input-stream */
335	stargo	1258	if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
336	stargo	1263	rdpsnd_dsp_softvol(s->data, s->size, format);
337	stargo	1258
338	stargo	1260	#ifdef B_ENDIAN
339			if (current_driver->need_byteswap_on_be)
340	stargo	1278	{
341	stargo	1263	rdpsnd_dsp_swapbytes(s->data, s->size, format);
342	stargo	1278	stream_be = True;
343			}
344	stargo	1260	#endif
345
346	stargo	1276	out.data = NULL;
347	stargo	1263
348	stargo	1279	if (current_driver->need_resampling)
349	stargo	1278	out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format, stream_be);
350	stargo	1263
351	stargo	1276	if (out.data == NULL)
352			{
353			out.data = xmalloc(s->size);
354			memcpy(out.data, s->data, s->size);
355			out.size = s->size;
356			}
357
358	stargo	1263	out.p = out.data;
359			out.end = out.p + out.size;
360
361			return &out;
362	stargo	1258	}