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"

#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;

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)
{
        if (device_srate != 44100 && device_srate != 22050)
                return False;

        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;

        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;
        if ((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050))
                return False;

        return True;
}

uint32
rdpsnd_dsp_resample(unsigned char **out, unsigned char *in, unsigned int size,
                    WAVEFORMATEX * format)
{
        static BOOL warned = False;
        int outsize, offset;
        int samplewidth = format->wBitsPerSample / 8;
        int i;

        if ((resample_to_bitspersample != format->wBitsPerSample) ||
            (resample_to_channels != format->nChannels) ||
            ((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050)))
        {
                if (!warned)
                {
                        warning("unsupported resample-settings (%u/%u/%u), not resampling!\n",
                                format->nSamplesPerSec, format->wBitsPerSample, format->nChannels);
                        warned = True;
                }
                return 0;
        }

        if (format->nSamplesPerSec == 22050)
        {
                outsize = size * 2;
                *out = xmalloc(outsize);

                /* Resample 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);

                }
        }
        else
        {
                outsize = 0;
        }

        return outsize;
}

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

        /* 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);
#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);
        }

        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			#define MAX_VOLUME 65535
26
27			static uint16 softvol_left = MAX_VOLUME;
28			static uint16 softvol_right = MAX_VOLUME;
29	stargo	1276	static uint32 resample_to_srate = 44100;
30			static uint16 resample_to_bitspersample = 16;
31			static uint16 resample_to_channels = 2;
32	stargo	1258
33			void
34			rdpsnd_dsp_softvol_set(uint16 left, uint16 right)
35			{
36			softvol_left = left;
37			softvol_right = right;
38			DEBUG(("rdpsnd_dsp_softvol_set: left: %u, right: %u\n", left, right));
39			}
40
41	stargo	1260	void
42	stargo	1259	rdpsnd_dsp_softvol(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
43	stargo	1258	{
44			unsigned int factor_left, factor_right;
45	stargo	1259	unsigned char *posin = buffer;
46			unsigned char *posout = buffer;
47	stargo	1258
48	stargo	1259	if ((softvol_left == MAX_VOLUME) && (softvol_right == MAX_VOLUME))
49			return;
50
51	stargo	1270	factor_left = (softvol_left * 256) / MAX_VOLUME;
52			factor_right = (softvol_right * 256) / MAX_VOLUME;
53	stargo	1258
54			if (format->nChannels == 1)
55			{
56			factor_left = factor_right = (factor_left + factor_right) / 2;
57			}
58
59			if (format->wBitsPerSample == 8)
60			{
61	stargo	1262	sint8 val;
62	stargo	1258
63	stargo	1259	while (posout < buffer + size)
64	stargo	1258	{
65			/* Left */
66			val = *posin++;
67			val = (val * factor_left) >> 8;
68			*posout++ = val;
69
70			/* Right */
71			val = *posin++;
72			val = (val * factor_right) >> 8;
73			*posout++ = val;
74			}
75			}
76			else
77			{
78	stargo	1262	sint16 val;
79	stargo	1258
80	stargo	1259	while (posout < buffer + size)
81	stargo	1258	{
82			/* Left */
83			val = *posin++;
84			val \|= *posin++ << 8;
85			val = (val * factor_left) >> 8;
86			*posout++ = val & 0xff;
87			*posout++ = val >> 8;
88
89			/* Right */
90			val = *posin++;
91			val \|= *posin++ << 8;
92			val = (val * factor_right) >> 8;
93			*posout++ = val & 0xff;
94			*posout++ = val >> 8;
95			}
96			}
97
98	stargo	1263	DEBUG(("using softvol with factors left: %d, right: %d (%d/%d)\n", factor_left,
99			factor_right, format->wBitsPerSample, format->nChannels));
100	stargo	1258	}
101
102	stargo	1260	void
103			rdpsnd_dsp_swapbytes(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
104			{
105			int i;
106			uint8 swap;
107
108			if (format->wBitsPerSample == 8)
109			return;
110
111			for (i = 0; i < size; i += 2)
112			{
113			swap = *(buffer + i);
114			(buffer + i) = (buffer + i + 1);
115			*(buffer + i + 1) = swap;
116			}
117			}
118
119	stargo	1276	BOOL
120			rdpsnd_dsp_resample_set(uint32 device_srate, uint16 device_bitspersample, uint16 device_channels)
121			{
122			if (device_srate != 44100 && device_srate != 22050)
123			return False;
124	stargo	1263
125	stargo	1276	if (device_bitspersample != 16 && device_bitspersample != 8)
126			return False;
127
128			if (device_channels != 1 && device_channels != 2)
129			return False;
130
131			resample_to_srate = device_srate;
132			resample_to_bitspersample = device_bitspersample;
133			resample_to_channels = device_channels;
134
135			return True;
136			}
137
138			BOOL
139			rdpsnd_dsp_resample_supported(WAVEFORMATEX * format)
140			{
141			if (format->wFormatTag != WAVE_FORMAT_PCM)
142			return False;
143			if ((format->nChannels != 1) && (format->nChannels != 2))
144			return False;
145			if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16))
146			return False;
147			if ((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050))
148			return False;
149
150			return True;
151			}
152
153			uint32
154			rdpsnd_dsp_resample(unsigned char *out, unsigned char in, unsigned int size,
155			WAVEFORMATEX * format)
156			{
157			static BOOL warned = False;
158			int outsize, offset;
159			int samplewidth = format->wBitsPerSample / 8;
160			int i;
161
162			if ((resample_to_bitspersample != format->wBitsPerSample) \|\|
163			(resample_to_channels != format->nChannels) \|\|
164			((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050)))
165			{
166			if (!warned)
167			{
168			warning("unsupported resample-settings (%u/%u/%u), not resampling!\n",
169			format->nSamplesPerSec, format->wBitsPerSample, format->nChannels);
170			warned = True;
171			}
172			return 0;
173			}
174
175			if (format->nSamplesPerSec == 22050)
176			{
177			outsize = size * 2;
178			*out = xmalloc(outsize);
179
180			/* Resample to 44100 */
181			for (i = 0; i < (size / samplewidth); i++)
182			{
183			/* On a stereo-channel we must make sure that left and right
184			does not get mixed up, so we need to expand the sample-
185			data with channels in mind: 1234 -> 12123434
186			If we have a mono-channel, we can expand the data by simply
187			doubling the sample-data: 1234 -> 11223344 */
188			if (resample_to_channels == 2)
189			offset = ((i * 2) - (i & 1)) * samplewidth;
190			else
191			offset = (i * 2) * samplewidth;
192
193			memcpy(out + offset, in + (i samplewidth), samplewidth);
194			memcpy(out + (resample_to_channels samplewidth + offset),
195			in + (i * samplewidth), samplewidth);
196
197			}
198			}
199			else
200			{
201			outsize = 0;
202			}
203
204			return outsize;
205			}
206
207	stargo	1263	STREAM
208	stargo	1276	rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
209	stargo	1258	{
210	stargo	1263	static struct stream out;
211	stargo	1258
212	stargo	1263	/* softvol and byteswap do not change the amount of data they
213			return, so they can operate on the input-stream */
214	stargo	1258	if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
215	stargo	1263	rdpsnd_dsp_softvol(s->data, s->size, format);
216	stargo	1258
217	stargo	1260	#ifdef B_ENDIAN
218			if (current_driver->need_byteswap_on_be)
219	stargo	1263	rdpsnd_dsp_swapbytes(s->data, s->size, format);
220	stargo	1260	#endif
221
222	stargo	1276	out.data = NULL;
223	stargo	1263
224	stargo	1276	if (current_driver->wave_out_format_supported == rdpsnd_dsp_resample_supported)
225			{
226			out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format);
227			}
228	stargo	1263
229	stargo	1276	if (out.data == NULL)
230			{
231			out.data = xmalloc(s->size);
232			memcpy(out.data, s->data, s->size);
233			out.size = s->size;
234			}
235
236	stargo	1263	out.p = out.data;
237			out.end = out.p + out.size;
238
239			return &out;
240	stargo	1258	}