trunk/rdesktop/rdpsnd_libao.c

/* 
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - libao-driver
   Copyright (C) Matthew Chapman 2003
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
   Copyright (C) Michael Gernoth mike@zerfleddert.de 2005

   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 <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ao/ao.h>

#define MAX_QUEUE       10
#define WAVEOUTBUF      32

int g_dsp_fd;
ao_device *o_device = NULL;
int default_driver;
int g_samplerate;
BOOL g_dsp_busy = False;
static short g_samplewidth;

static struct audio_packet
{
        struct stream s;
        uint16 tick;
        uint8 index;
} packet_queue[MAX_QUEUE];
static unsigned int queue_hi, queue_lo;

BOOL
wave_out_open(void)
{
        ao_sample_format format;

        ao_initialize();
        default_driver = ao_default_driver_id();

        format.bits = 16;
        format.channels = 2;
        format.rate = 44100;
        g_samplerate = 44100;
        format.byte_format = AO_FMT_LITTLE;

        o_device = ao_open_live(default_driver, &format, NULL);
        if (o_device == NULL)
        {
                return False;
        }

        g_dsp_fd = 0;
        queue_lo = queue_hi = 0;

        return True;
}

void
wave_out_close(void)
{
        /* Ack all remaining packets */
        while (queue_lo != queue_hi)
        {
                rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index);
                free(packet_queue[queue_lo].s.data);
                queue_lo = (queue_lo + 1) % MAX_QUEUE;
        }

        if (o_device != NULL)
                ao_close(o_device);
        ao_shutdown();
}

BOOL
wave_out_format_supported(WAVEFORMATEX * pwfx)
{
        if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
                return False;
        if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
                return False;
        if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
                return False;
        /* The only common denominator between libao output drivers is a sample-rate of
           44100, we need to upsample 22050 to it */
        if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050))
                return False;

        return True;
}

BOOL
wave_out_set_format(WAVEFORMATEX * pwfx)
{
        ao_sample_format format;

        format.bits = pwfx->wBitsPerSample;
        format.channels = pwfx->nChannels;
        format.rate = 44100;
        g_samplerate = pwfx->nSamplesPerSec;
        format.byte_format = AO_FMT_LITTLE;

        g_samplewidth = pwfx->wBitsPerSample / 8;

        if(o_device != NULL)
                ao_close(o_device);

        o_device = ao_open_live(default_driver, &format, NULL);
        if (o_device == NULL)
        {
                return False;
        }


        return True;
}

void
wave_out_volume(uint16 left, uint16 right)
{
}

void
wave_out_write(STREAM s, uint16 tick, uint8 index)
{
        struct audio_packet *packet = &packet_queue[queue_hi];
        unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;

        if (next_hi == queue_lo)
        {
                error("No space to queue audio packet\n");
                return;
        }

        queue_hi = next_hi;

        packet->s = *s;
        packet->tick = tick;
        packet->index = index;
        packet->s.p += 4;

        /* we steal the data buffer from s, give it a new one */
        s->data = malloc(s->size);

        if (!g_dsp_busy)
                wave_out_play();
}

void
wave_out_play(void)
{
        struct audio_packet *packet;
        STREAM out;
        unsigned char expanded[WAVEOUTBUF];
        int offset,len,i;

        if (queue_lo == queue_hi)
        {
                g_dsp_busy = 0;
                return;
        }

        packet = &packet_queue[queue_lo];
        out = &packet->s;

        len = 0;

        if (g_samplerate == 22050 )
        {
                /* Resample to 44100 */
                for(i=0; (i<((WAVEOUTBUF/8)*(3-g_samplewidth))) && (out->p < out->end); i++)
                {
                        offset=i*4*g_samplewidth;
                        memcpy(&expanded[0*g_samplewidth+offset],out->p,g_samplewidth);
                        memcpy(&expanded[2*g_samplewidth+offset],out->p,g_samplewidth);
                        out->p += 2;

                        memcpy(&expanded[1*g_samplewidth+offset],out->p,g_samplewidth);
                        memcpy(&expanded[3*g_samplewidth+offset],out->p,g_samplewidth);
                        out->p += 2;
                        len += 4*g_samplewidth;
                }
        }
        else
        {
                len = (WAVEOUTBUF > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTBUF;
                memcpy(expanded,out->p,len);
                out->p += len;
        }

        ao_play(o_device, expanded, len);

        if (out->p == out->end)
        {
                rdpsnd_send_completion(packet->tick, packet->index);
                free(out->data);
                queue_lo = (queue_lo + 1) % MAX_QUEUE;
        }

        g_dsp_busy = 1;
        return;
}
1	stargo	833	/*
2			rdesktop: A Remote Desktop Protocol client.
3			Sound Channel Process Functions - libao-driver
4			Copyright (C) Matthew Chapman 2003
5			Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
6			Copyright (C) Michael Gernoth mike@zerfleddert.de 2005
7
8			This program is free software; you can redistribute it and/or modify
9			it under the terms of the GNU General Public License as published by
10			the Free Software Foundation; either version 2 of the License, or
11			(at your option) any later version.
12
13			This program is distributed in the hope that it will be useful,
14			but WITHOUT ANY WARRANTY; without even the implied warranty of
15			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			GNU General Public License for more details.
17
18			You should have received a copy of the GNU General Public License
19			along with this program; if not, write to the Free Software
20			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			*/
22
23			#include "rdesktop.h"
24			#include <unistd.h>
25			#include <fcntl.h>
26			#include <errno.h>
27			#include <ao/ao.h>
28
29			#define MAX_QUEUE 10
30	stargo	836	#define WAVEOUTBUF 32
31	stargo	833
32			int g_dsp_fd;
33			ao_device *o_device = NULL;
34			int default_driver;
35	stargo	835	int g_samplerate;
36	stargo	833	BOOL g_dsp_busy = False;
37			static short g_samplewidth;
38
39			static struct audio_packet
40			{
41			struct stream s;
42			uint16 tick;
43			uint8 index;
44			} packet_queue[MAX_QUEUE];
45			static unsigned int queue_hi, queue_lo;
46
47			BOOL
48			wave_out_open(void)
49			{
50			ao_sample_format format;
51
52			ao_initialize();
53			default_driver = ao_default_driver_id();
54
55			format.bits = 16;
56			format.channels = 2;
57			format.rate = 44100;
58	stargo	835	g_samplerate = 44100;
59	stargo	833	format.byte_format = AO_FMT_LITTLE;
60
61			o_device = ao_open_live(default_driver, &format, NULL);
62			if (o_device == NULL)
63			{
64			return False;
65			}
66
67			g_dsp_fd = 0;
68			queue_lo = queue_hi = 0;
69
70			return True;
71			}
72
73			void
74			wave_out_close(void)
75			{
76			/* Ack all remaining packets */
77			while (queue_lo != queue_hi)
78			{
79			rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index);
80			free(packet_queue[queue_lo].s.data);
81			queue_lo = (queue_lo + 1) % MAX_QUEUE;
82			}
83
84			if (o_device != NULL)
85			ao_close(o_device);
86			ao_shutdown();
87			}
88
89			BOOL
90			wave_out_format_supported(WAVEFORMATEX * pwfx)
91			{
92			if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
93			return False;
94			if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
95			return False;
96			if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
97			return False;
98			/* The only common denominator between libao output drivers is a sample-rate of
99	stargo	835	44100, we need to upsample 22050 to it */
100			if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050))
101	stargo	833	return False;
102
103			return True;
104			}
105
106			BOOL
107			wave_out_set_format(WAVEFORMATEX * pwfx)
108			{
109			ao_sample_format format;
110
111			format.bits = pwfx->wBitsPerSample;
112			format.channels = pwfx->nChannels;
113			format.rate = 44100;
114	stargo	835	g_samplerate = pwfx->nSamplesPerSec;
115	stargo	833	format.byte_format = AO_FMT_LITTLE;
116
117			g_samplewidth = pwfx->wBitsPerSample / 8;
118
119			if(o_device != NULL)
120			ao_close(o_device);
121
122			o_device = ao_open_live(default_driver, &format, NULL);
123			if (o_device == NULL)
124			{
125			return False;
126			}
127
128
129			return True;
130			}
131
132			void
133			wave_out_volume(uint16 left, uint16 right)
134			{
135			}
136
137			void
138			wave_out_write(STREAM s, uint16 tick, uint8 index)
139			{
140			struct audio_packet *packet = &packet_queue[queue_hi];
141			unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
142
143			if (next_hi == queue_lo)
144			{
145			error("No space to queue audio packet\n");
146			return;
147			}
148
149			queue_hi = next_hi;
150
151			packet->s = *s;
152			packet->tick = tick;
153			packet->index = index;
154			packet->s.p += 4;
155
156			/* we steal the data buffer from s, give it a new one */
157			s->data = malloc(s->size);
158
159			if (!g_dsp_busy)
160			wave_out_play();
161			}
162
163			void
164			wave_out_play(void)
165			{
166			struct audio_packet *packet;
167			STREAM out;
168	stargo	836	unsigned char expanded[WAVEOUTBUF];
169	stargo	835	int offset,len,i;
170	stargo	833
171	stargo	835	if (queue_lo == queue_hi)
172	stargo	833	{
173	stargo	835	g_dsp_busy = 0;
174			return;
175			}
176	stargo	833
177	stargo	835	packet = &packet_queue[queue_lo];
178			out = &packet->s;
179	stargo	833
180	stargo	835	len = 0;
181	stargo	833
182	stargo	835	if (g_samplerate == 22050 )
183			{
184			/* Resample to 44100 */
185	stargo	836	for(i=0; (i<((WAVEOUTBUF/8)*(3-g_samplewidth))) && (out->p < out->end); i++)
186	stargo	835	{
187			offset=i4g_samplewidth;
188			memcpy(&expanded[0*g_samplewidth+offset],out->p,g_samplewidth);
189			memcpy(&expanded[2*g_samplewidth+offset],out->p,g_samplewidth);
190			out->p += 2;
191	stargo	833
192	stargo	835	memcpy(&expanded[1*g_samplewidth+offset],out->p,g_samplewidth);
193			memcpy(&expanded[3*g_samplewidth+offset],out->p,g_samplewidth);
194			out->p += 2;
195			len += 4*g_samplewidth;
196	stargo	833	}
197			}
198	stargo	835	else
199			{
200	stargo	836	len = (WAVEOUTBUF > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTBUF;
201	stargo	835	memcpy(expanded,out->p,len);
202			out->p += len;
203			}
204
205			ao_play(o_device, expanded, len);
206
207			if (out->p == out->end)
208			{
209			rdpsnd_send_completion(packet->tick, packet->index);
210			free(out->data);
211			queue_lo = (queue_lo + 1) % MAX_QUEUE;
212			}
213
214			g_dsp_busy = 1;
215			return;
216	stargo	833	}