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 * 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	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	1276	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	stargo	1278	#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	stargo	1276	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	stargo	1278	WAVEFORMATEX * format, BOOL stream_be)
175	stargo	1276	{
176	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
177			SRC_DATA resample_data;
178			float infloat, outfloat;
179	stargo	1282	int err;
180	stargo	1278	#else
181	stargo	1283	int ratio1k = (resample_to_srate * 1000) / format->nSamplesPerSec;
182	stargo	1278	#endif
183	stargo	1283	int innum, outnum;
184	stargo	1276	static BOOL warned = False;
185	stargo	1281	unsigned char *tmpdata = NULL;
186	stargo	1276	int samplewidth = format->wBitsPerSample / 8;
187	stargo	1278	int outsize = 0;
188	stargo	1281	int i;
189	stargo	1276
190	stargo	1277	if ((resample_to_bitspersample == format->wBitsPerSample) &&
191			(resample_to_channels == format->nChannels) &&
192			(resample_to_srate == format->nSamplesPerSec))
193			return 0;
194
195	stargo	1278	#ifdef B_ENDIAN
196			if (!stream_be)
197	stargo	1281	rdpsnd_dsp_swapbytes(in, size, format);
198	stargo	1278	#endif
199	stargo	1281
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	stargo	1278	{
208	stargo	1281	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	stargo	1278	}
218	stargo	1281	}
219	stargo	1278
220	stargo	1281	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	stargo	1283	innum = size / samplewidth;
227
228	stargo	1281	/* Do the resampling */
229	stargo	1278	#ifdef HAVE_LIBSAMPLERATE
230			if (src_converter == NULL)
231	stargo	1276	{
232	stargo	1278	warning("no samplerate converter available!!\n");
233			return 0;
234			}
235
236	stargo	1283	outnum = ((float) innum * ((float) resample_to_srate / (float) format->nSamplesPerSec)) + 1;
237	stargo	1278
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	stargo	1282	if ((err = src_process(src_converter, &resample_data)) != 0)
252			error("src_process: %s", src_strerror(err));
253
254	stargo	1278	xfree(infloat);
255
256	stargo	1282	outsize = resample_data.output_frames_gen * resample_to_channels * samplewidth;
257	stargo	1278	*out = xmalloc(outsize);
258	stargo	1283	src_float_to_short_array(outfloat, (short ) out,
259			resample_data.output_frames_gen * resample_to_channels);
260	stargo	1278	xfree(outfloat);
261
262			#else
263	stargo	1283	/* Michaels simple linear resampler */
264			if (resample_to_srate < format->nSamplesPerSec)
265	stargo	1278	{
266	stargo	1283	warning("downsampling currently not supported!\n");
267	stargo	1276	return 0;
268			}
269
270	stargo	1283	outnum = (innum * ratio1k) / 1000;
271
272			outsize = outnum * samplewidth;
273	stargo	1277	*out = xmalloc(outsize);
274	stargo	1283	bzero(*out, outsize);
275	stargo	1277
276	stargo	1283	for (i = 0; i < outsize / (resample_to_channels * samplewidth); i++)
277	stargo	1276	{
278	stargo	1284	int source = ((i * 1000) + ratio1k - 1000) / (ratio1k + 1);
279	stargo	1283
280			if (source * resample_to_channels + samplewidth > size)
281			break;
282
283	stargo	1277	if (resample_to_channels == 2)
284	stargo	1283	{
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	stargo	1277	else
292	stargo	1283	{
293			memcpy(out + (i samplewidth), in + (source * samplewidth), samplewidth);
294			}
295	stargo	1276	}
296	stargo	1283	outsize = i * resample_to_channels * samplewidth;
297	stargo	1278	#endif
298	stargo	1276
299	stargo	1281	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	stargo	1278	#ifdef B_ENDIAN
319			if (!stream_be)
320	stargo	1281	rdpsnd_dsp_swapbytes(*out, outsize, format);
321	stargo	1278	#endif
322	stargo	1281	return outsize;
323	stargo	1276	}
324
325	stargo	1263	STREAM
326	stargo	1276	rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
327	stargo	1258	{
328	stargo	1263	static struct stream out;
329	stargo	1278	BOOL stream_be = False;
330	stargo	1258
331	stargo	1263	/* softvol and byteswap do not change the amount of data they
332			return, so they can operate on the input-stream */
333	stargo	1258	if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
334	stargo	1263	rdpsnd_dsp_softvol(s->data, s->size, format);
335	stargo	1258
336	stargo	1260	#ifdef B_ENDIAN
337			if (current_driver->need_byteswap_on_be)
338	stargo	1278	{
339	stargo	1263	rdpsnd_dsp_swapbytes(s->data, s->size, format);
340	stargo	1278	stream_be = True;
341			}
342	stargo	1260	#endif
343
344	stargo	1276	out.data = NULL;
345	stargo	1263
346	stargo	1279	if (current_driver->need_resampling)
347	stargo	1278	out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format, stream_be);
348	stargo	1263
349	stargo	1276	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	stargo	1263	out.p = out.data;
357			out.end = out.p + out.size;
358
359			return &out;
360	stargo	1258	}