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 <strings.h>

#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 * 1000) + ratio1k - 1000) / (ratio1k + 1);

                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 <strings.h>
22
23	#include "rdesktop.h"
24	#include "rdpsnd.h"
25	#include "rdpsnd_dsp.h"
26
27	#ifdef HAVE_LIBSAMPLERATE
28	#include <samplerate.h>
29
30	#define SRC_CONVERTER SRC_SINC_MEDIUM_QUALITY
31	#endif
32
33	#define MAX_VOLUME 65535
34
35	static uint16 softvol_left = MAX_VOLUME;
36	static uint16 softvol_right = MAX_VOLUME;
37	static uint32 resample_to_srate = 44100;
38	static uint16 resample_to_bitspersample = 16;
39	static uint16 resample_to_channels = 2;
40	#ifdef HAVE_LIBSAMPLERATE
41	static SRC_STATE *src_converter = NULL;
42	#endif
43
44	void
45	rdpsnd_dsp_softvol_set(uint16 left, uint16 right)
46	{
47	softvol_left = left;
48	softvol_right = right;
49	DEBUG(("rdpsnd_dsp_softvol_set: left: %u, right: %u\n", left, right));
50	}
51
52	void
53	rdpsnd_dsp_softvol(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
54	{
55	unsigned int factor_left, factor_right;
56	unsigned char *posin = buffer;
57	unsigned char *posout = buffer;
58
59	if ((softvol_left == MAX_VOLUME) && (softvol_right == MAX_VOLUME))
60	return;
61
62	factor_left = (softvol_left * 256) / MAX_VOLUME;
63	factor_right = (softvol_right * 256) / MAX_VOLUME;
64
65	if (format->nChannels == 1)
66	{
67	factor_left = factor_right = (factor_left + factor_right) / 2;
68	}
69
70	if (format->wBitsPerSample == 8)
71	{
72	sint8 val;
73
74	while (posout < buffer + size)
75	{
76	/* Left */
77	val = *posin++;
78	val = (val * factor_left) >> 8;
79	*posout++ = val;
80
81	/* Right */
82	val = *posin++;
83	val = (val * factor_right) >> 8;
84	*posout++ = val;
85	}
86	}
87	else
88	{
89	sint16 val;
90
91	while (posout < buffer + size)
92	{
93	/* Left */
94	val = *posin++;
95	val \|= *posin++ << 8;
96	val = (val * factor_left) >> 8;
97	*posout++ = val & 0xff;
98	*posout++ = val >> 8;
99
100	/* Right */
101	val = *posin++;
102	val \|= *posin++ << 8;
103	val = (val * factor_right) >> 8;
104	*posout++ = val & 0xff;
105	*posout++ = val >> 8;
106	}
107	}
108
109	DEBUG(("using softvol with factors left: %d, right: %d (%d/%d)\n", factor_left,
110	factor_right, format->wBitsPerSample, format->nChannels));
111	}
112
113	void
114	rdpsnd_dsp_swapbytes(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
115	{
116	int i;
117	uint8 swap;
118
119	if (format->wBitsPerSample == 8)
120	return;
121
122	for (i = 0; i < size; i += 2)
123	{
124	swap = *(buffer + i);
125	(buffer + i) = (buffer + i + 1);
126	*(buffer + i + 1) = swap;
127	}
128	}
129
130	BOOL
131	rdpsnd_dsp_resample_set(uint32 device_srate, uint16 device_bitspersample, uint16 device_channels)
132	{
133	#ifdef HAVE_LIBSAMPLERATE
134	int err;
135	#endif
136
137	if (device_bitspersample != 16 && device_bitspersample != 8)
138	return False;
139
140	if (device_channels != 1 && device_channels != 2)
141	return False;
142
143	resample_to_srate = device_srate;
144	resample_to_bitspersample = device_bitspersample;
145	resample_to_channels = device_channels;
146
147	#ifdef HAVE_LIBSAMPLERATE
148	if (src_converter != NULL)
149	src_converter = src_delete(src_converter);
150
151	if ((src_converter = src_new(SRC_CONVERTER, device_channels, &err)) == NULL)
152	{
153	warning("src_new failed: %d!\n", err);
154	return False;
155	}
156	#endif
157
158	return True;
159	}
160
161	BOOL
162	rdpsnd_dsp_resample_supported(WAVEFORMATEX * format)
163	{
164	if (format->wFormatTag != WAVE_FORMAT_PCM)
165	return False;
166	if ((format->nChannels != 1) && (format->nChannels != 2))
167	return False;
168	if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16))
169	return False;
170
171	return True;
172	}
173
174	uint32
175	rdpsnd_dsp_resample(unsigned char *out, unsigned char in, unsigned int size,
176	WAVEFORMATEX * format, BOOL stream_be)
177	{
178	#ifdef HAVE_LIBSAMPLERATE
179	SRC_DATA resample_data;
180	float infloat, outfloat;
181	int err;
182	#else
183	int ratio1k = (resample_to_srate * 1000) / format->nSamplesPerSec;
184	#endif
185	int innum, outnum;
186	static BOOL warned = False;
187	unsigned char *tmpdata = NULL;
188	int samplewidth = format->wBitsPerSample / 8;
189	int outsize = 0;
190	int i;
191
192	if ((resample_to_bitspersample == format->wBitsPerSample) &&
193	(resample_to_channels == format->nChannels) &&
194	(resample_to_srate == format->nSamplesPerSec))
195	return 0;
196
197	#ifdef B_ENDIAN
198	if (!stream_be)
199	rdpsnd_dsp_swapbytes(in, size, format);
200	#endif
201
202	/* Expand 8bit input-samples to 16bit */
203	#ifndef HAVE_LIBSAMPLERATE /* libsamplerate needs 16bit samples */
204	if (format->wBitsPerSample != resample_to_bitspersample)
205	#endif
206	{
207	/* source: 8 bit, dest: 16bit */
208	if (format->wBitsPerSample == 8)
209	{
210	tmpdata = xmalloc(size * 2);
211	for (i = 0; i < size; i++)
212	{
213	tmpdata[i * 2] = in[i];
214	tmpdata[(i * 2) + 1] = 0x00;
215	}
216	in = tmpdata;
217	samplewidth = 16 / 2;
218	size *= 2;
219	}
220	}
221
222	if (resample_to_channels != format->nChannels)
223	{
224	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);
225	warned = True;
226	}
227
228	innum = size / samplewidth;
229
230	/* Do the resampling */
231	#ifdef HAVE_LIBSAMPLERATE
232	if (src_converter == NULL)
233	{
234	warning("no samplerate converter available!!\n");
235	return 0;
236	}
237
238	outnum = ((float) innum * ((float) resample_to_srate / (float) format->nSamplesPerSec)) + 1;
239
240	infloat = xmalloc(sizeof(float) * innum);
241	outfloat = xmalloc(sizeof(float) * outnum);
242
243	src_short_to_float_array((short *) in, infloat, innum);
244
245	bzero(&resample_data, sizeof(resample_data));
246	resample_data.data_in = infloat;
247	resample_data.data_out = outfloat;
248	resample_data.input_frames = innum / resample_to_channels;
249	resample_data.output_frames = outnum / resample_to_channels;
250	resample_data.src_ratio = (double) resample_to_srate / (double) format->nSamplesPerSec;
251	resample_data.end_of_input = 0;
252
253	if ((err = src_process(src_converter, &resample_data)) != 0)
254	error("src_process: %s", src_strerror(err));
255
256	xfree(infloat);
257
258	outsize = resample_data.output_frames_gen * resample_to_channels * samplewidth;
259	*out = xmalloc(outsize);
260	src_float_to_short_array(outfloat, (short ) out,
261	resample_data.output_frames_gen * resample_to_channels);
262	xfree(outfloat);
263
264	#else
265	/* Michaels simple linear resampler */
266	if (resample_to_srate < format->nSamplesPerSec)
267	{
268	warning("downsampling currently not supported!\n");
269	return 0;
270	}
271
272	outnum = (innum * ratio1k) / 1000;
273
274	outsize = outnum * samplewidth;
275	*out = xmalloc(outsize);
276	bzero(*out, outsize);
277
278	for (i = 0; i < outsize / (resample_to_channels * samplewidth); i++)
279	{
280	int source = ((i * 1000) + ratio1k - 1000) / (ratio1k + 1);
281
282	if (source * resample_to_channels + samplewidth > size)
283	break;
284
285	if (resample_to_channels == 2)
286	{
287	memcpy(out + (i resample_to_channels * samplewidth),
288	in + (source * resample_to_channels * samplewidth), samplewidth);
289	memcpy(out + (i resample_to_channels * samplewidth) + samplewidth,
290	in + (source * resample_to_channels * samplewidth) + samplewidth,
291	samplewidth);
292	}
293	else
294	{
295	memcpy(out + (i samplewidth), in + (source * samplewidth), samplewidth);
296	}
297	}
298	outsize = i * resample_to_channels * samplewidth;
299	#endif
300
301	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	#ifdef B_ENDIAN
321	if (!stream_be)
322	rdpsnd_dsp_swapbytes(*out, outsize, format);
323	#endif
324	return outsize;
325	}
326
327	STREAM
328	rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
329	{
330	static struct stream out;
331	BOOL stream_be = False;
332
333	/* softvol and byteswap do not change the amount of data they
334	return, so they can operate on the input-stream */
335	if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
336	rdpsnd_dsp_softvol(s->data, s->size, format);
337
338	#ifdef B_ENDIAN
339	if (current_driver->need_byteswap_on_be)
340	{
341	rdpsnd_dsp_swapbytes(s->data, s->size, format);
342	stream_be = True;
343	}
344	#endif
345
346	out.data = NULL;
347
348	if (current_driver->need_resampling)
349	out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format, stream_be);
350
351	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	out.p = out.data;
359	out.end = out.p + out.size;
360
361	return &out;
362	}