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

        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;

        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 err;
#else
        int ratio1k = (resample_to_srate * 1000) / format->nSamplesPerSec;
#endif
        int innum, outnum;
        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;
        }

        innum = size / samplewidth;

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

        outnum = ((float) innum * ((float) resample_to_srate / (float) format->nSamplesPerSec)) + 1;

        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;

        if ((err = src_process(src_converter, &resample_data)) != 0)
                error("src_process: %s", src_strerror(err));

        xfree(infloat);

        outsize = resample_data.output_frames_gen * resample_to_channels * samplewidth;
        *out = xmalloc(outsize);
        src_float_to_short_array(outfloat, (short *) *out,
                                 resample_data.output_frames_gen * resample_to_channels);
        xfree(outfloat);

#else
        /* Michaels simple linear resampler */
        if (resample_to_srate < format->nSamplesPerSec)
        {
                warning("downsampling currently not supported!\n");
                return 0;
        }

        outnum = (innum * ratio1k) / 1000;

        outsize = outnum * samplewidth;
        *out = xmalloc(outsize);
        bzero(*out, outsize);

        for (i = 0; i < outsize / (resample_to_channels * samplewidth); i++)
        {
                int source = ((i + ratio1k / 1000 - 1) * 1000) / ratio1k;

                if (source * resample_to_channels + samplewidth > size)
                        break;

                if (resample_to_channels == 2)
                {
                        memcpy(*out + (i * resample_to_channels * samplewidth),
                               in + (source * resample_to_channels * samplewidth), samplewidth);
                        memcpy(*out + (i * resample_to_channels * samplewidth) + samplewidth,
                               in + (source * resample_to_channels * samplewidth) + samplewidth,
                               samplewidth);
                }
                else
                {
                        memcpy(*out + (i * samplewidth), in + (source * samplewidth), samplewidth);
                }
        }
        outsize = i * resample_to_channels * 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	/*
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	if (device_bitspersample != 16 && device_bitspersample != 8)
136	return False;
137
138	if (device_channels != 1 && device_channels != 2)
139	return False;
140
141	resample_to_srate = device_srate;
142	resample_to_bitspersample = device_bitspersample;
143	resample_to_channels = device_channels;
144
145	#ifdef HAVE_LIBSAMPLERATE
146	if (src_converter != NULL)
147	src_converter = src_delete(src_converter);
148
149	if ((src_converter = src_new(SRC_CONVERTER, device_channels, &err)) == NULL)
150	{
151	warning("src_new failed: %d!\n", err);
152	return False;
153	}
154	#endif
155
156	return True;
157	}
158
159	BOOL
160	rdpsnd_dsp_resample_supported(WAVEFORMATEX * format)
161	{
162	if (format->wFormatTag != WAVE_FORMAT_PCM)
163	return False;
164	if ((format->nChannels != 1) && (format->nChannels != 2))
165	return False;
166	if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16))
167	return False;
168
169	return True;
170	}
171
172	uint32
173	rdpsnd_dsp_resample(unsigned char *out, unsigned char in, unsigned int size,
174	WAVEFORMATEX * format, BOOL stream_be)
175	{
176	#ifdef HAVE_LIBSAMPLERATE
177	SRC_DATA resample_data;
178	float infloat, outfloat;
179	int err;
180	#else
181	int ratio1k = (resample_to_srate * 1000) / format->nSamplesPerSec;
182	#endif
183	int innum, outnum;
184	static BOOL warned = False;
185	unsigned char *tmpdata = NULL;
186	int samplewidth = format->wBitsPerSample / 8;
187	int outsize = 0;
188	int i;
189
190	if ((resample_to_bitspersample == format->wBitsPerSample) &&
191	(resample_to_channels == format->nChannels) &&
192	(resample_to_srate == format->nSamplesPerSec))
193	return 0;
194
195	#ifdef B_ENDIAN
196	if (!stream_be)
197	rdpsnd_dsp_swapbytes(in, size, format);
198	#endif
199
200	/* Expand 8bit input-samples to 16bit */
201	#ifndef HAVE_LIBSAMPLERATE /* libsamplerate needs 16bit samples */
202	if (format->wBitsPerSample != resample_to_bitspersample)
203	#endif
204	{
205	/* source: 8 bit, dest: 16bit */
206	if (format->wBitsPerSample == 8)
207	{
208	tmpdata = xmalloc(size * 2);
209	for (i = 0; i < size; i++)
210	{
211	tmpdata[i * 2] = in[i];
212	tmpdata[(i * 2) + 1] = 0x00;
213	}
214	in = tmpdata;
215	samplewidth = 16 / 2;
216	size *= 2;
217	}
218	}
219
220	if (resample_to_channels != format->nChannels)
221	{
222	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);
223	warned = True;
224	}
225
226	innum = size / samplewidth;
227
228	/* Do the resampling */
229	#ifdef HAVE_LIBSAMPLERATE
230	if (src_converter == NULL)
231	{
232	warning("no samplerate converter available!!\n");
233	return 0;
234	}
235
236	outnum = ((float) innum * ((float) resample_to_srate / (float) format->nSamplesPerSec)) + 1;
237
238	infloat = xmalloc(sizeof(float) * innum);
239	outfloat = xmalloc(sizeof(float) * outnum);
240
241	src_short_to_float_array((short *) in, infloat, innum);
242
243	bzero(&resample_data, sizeof(resample_data));
244	resample_data.data_in = infloat;
245	resample_data.data_out = outfloat;
246	resample_data.input_frames = innum / resample_to_channels;
247	resample_data.output_frames = outnum / resample_to_channels;
248	resample_data.src_ratio = (double) resample_to_srate / (double) format->nSamplesPerSec;
249	resample_data.end_of_input = 0;
250
251	if ((err = src_process(src_converter, &resample_data)) != 0)
252	error("src_process: %s", src_strerror(err));
253
254	xfree(infloat);
255
256	outsize = resample_data.output_frames_gen * resample_to_channels * samplewidth;
257	*out = xmalloc(outsize);
258	src_float_to_short_array(outfloat, (short ) out,
259	resample_data.output_frames_gen * resample_to_channels);
260	xfree(outfloat);
261
262	#else
263	/* Michaels simple linear resampler */
264	if (resample_to_srate < format->nSamplesPerSec)
265	{
266	warning("downsampling currently not supported!\n");
267	return 0;
268	}
269
270	outnum = (innum * ratio1k) / 1000;
271
272	outsize = outnum * samplewidth;
273	*out = xmalloc(outsize);
274	bzero(*out, outsize);
275
276	for (i = 0; i < outsize / (resample_to_channels * samplewidth); i++)
277	{
278	int source = ((i + ratio1k / 1000 - 1) * 1000) / ratio1k;
279
280	if (source * resample_to_channels + samplewidth > size)
281	break;
282
283	if (resample_to_channels == 2)
284	{
285	memcpy(out + (i resample_to_channels * samplewidth),
286	in + (source * resample_to_channels * samplewidth), samplewidth);
287	memcpy(out + (i resample_to_channels * samplewidth) + samplewidth,
288	in + (source * resample_to_channels * samplewidth) + samplewidth,
289	samplewidth);
290	}
291	else
292	{
293	memcpy(out + (i samplewidth), in + (source * samplewidth), samplewidth);
294	}
295	}
296	outsize = i * resample_to_channels * samplewidth;
297	#endif
298
299	if (tmpdata != NULL)
300	xfree(tmpdata);
301
302	/* Shrink 16bit output-samples to 8bit */
303	#ifndef HAVE_LIBSAMPLERATE /* libsamplerate produces 16bit samples */
304	if (format->wBitsPerSample != resample_to_bitspersample)
305	#endif
306	{
307	/* source: 16 bit, dest: 8 bit */
308	if (resample_to_bitspersample == 8)
309	{
310	for (i = 0; i < outsize; i++)
311	{
312	out[i] = out[i * 2];
313	}
314	outsize /= 2;
315	}
316	}
317
318	#ifdef B_ENDIAN
319	if (!stream_be)
320	rdpsnd_dsp_swapbytes(*out, outsize, format);
321	#endif
322	return outsize;
323	}
324
325	STREAM
326	rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
327	{
328	static struct stream out;
329	BOOL stream_be = False;
330
331	/* softvol and byteswap do not change the amount of data they
332	return, so they can operate on the input-stream */
333	if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
334	rdpsnd_dsp_softvol(s->data, s->size, format);
335
336	#ifdef B_ENDIAN
337	if (current_driver->need_byteswap_on_be)
338	{
339	rdpsnd_dsp_swapbytes(s->data, s->size, format);
340	stream_be = True;
341	}
342	#endif
343
344	out.data = NULL;
345
346	if (current_driver->need_resampling)
347	out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format, stream_be);
348
349	if (out.data == NULL)
350	{
351	out.data = xmalloc(s->size);
352	memcpy(out.data, s->data, s->size);
353	out.size = s->size;
354	}
355
356	out.p = out.data;
357	out.end = out.p + out.size;
358
359	return &out;
360	}