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) &&
            (resample_to_srate == format->nSamplesPerSec))
                return 0;

        if ((resample_to_bitspersample != format->wBitsPerSample) ||
            (resample_to_channels != format->nChannels) || (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;
        }

        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);

        }

        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	/*
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	static uint32 resample_to_srate = 44100;
30	static uint16 resample_to_bitspersample = 16;
31	static uint16 resample_to_channels = 2;
32
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	void
42	rdpsnd_dsp_softvol(unsigned char buffer, unsigned int size, WAVEFORMATEX format)
43	{
44	unsigned int factor_left, factor_right;
45	unsigned char *posin = buffer;
46	unsigned char *posout = buffer;
47
48	if ((softvol_left == MAX_VOLUME) && (softvol_right == MAX_VOLUME))
49	return;
50
51	factor_left = (softvol_left * 256) / MAX_VOLUME;
52	factor_right = (softvol_right * 256) / MAX_VOLUME;
53
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	sint8 val;
62
63	while (posout < buffer + size)
64	{
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	sint16 val;
79
80	while (posout < buffer + size)
81	{
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	DEBUG(("using softvol with factors left: %d, right: %d (%d/%d)\n", factor_left,
99	factor_right, format->wBitsPerSample, format->nChannels));
100	}
101
102	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	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
125	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	(resample_to_srate == format->nSamplesPerSec))
165	return 0;
166
167	if ((resample_to_bitspersample != format->wBitsPerSample) \|\|
168	(resample_to_channels != format->nChannels) \|\| (format->nSamplesPerSec != 22050))
169	{
170	if (!warned)
171	{
172	warning("unsupported resample-settings (%u/%u/%u), not resampling!\n",
173	format->nSamplesPerSec, format->wBitsPerSample, format->nChannels);
174	warned = True;
175	}
176	return 0;
177	}
178
179	outsize = size * 2;
180	*out = xmalloc(outsize);
181
182	/* Resample from 22050 to 44100 */
183	for (i = 0; i < (size / samplewidth); i++)
184	{
185	/* On a stereo-channel we must make sure that left and right
186	does not get mixed up, so we need to expand the sample-
187	data with channels in mind: 1234 -> 12123434
188	If we have a mono-channel, we can expand the data by simply
189	doubling the sample-data: 1234 -> 11223344 */
190	if (resample_to_channels == 2)
191	offset = ((i * 2) - (i & 1)) * samplewidth;
192	else
193	offset = (i * 2) * samplewidth;
194
195	memcpy(out + offset, in + (i samplewidth), samplewidth);
196	memcpy(out + (resample_to_channels samplewidth + offset),
197	in + (i * samplewidth), samplewidth);
198
199	}
200
201	return outsize;
202	}
203
204	STREAM
205	rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format)
206	{
207	static struct stream out;
208
209	/* softvol and byteswap do not change the amount of data they
210	return, so they can operate on the input-stream */
211	if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set)
212	rdpsnd_dsp_softvol(s->data, s->size, format);
213
214	#ifdef B_ENDIAN
215	if (current_driver->need_byteswap_on_be)
216	rdpsnd_dsp_swapbytes(s->data, s->size, format);
217	#endif
218
219	out.data = NULL;
220
221	if (current_driver->wave_out_format_supported == rdpsnd_dsp_resample_supported)
222	out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format);
223
224	if (out.data == NULL)
225	{
226	out.data = xmalloc(s->size);
227	memcpy(out.data, s->data, s->size);
228	out.size = s->size;
229	}
230
231	out.p = out.data;
232	out.end = out.p + out.size;
233
234	return &out;
235	}