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

int g_dsp_fd;
ao_device *o_device = NULL;
int default_driver;
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;
        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, windows gives a max of 22050. we need to upsample that...
           TODO: support 11025, too */
        if (pwfx->nSamplesPerSec != 22050)
                return False;

        return True;
}

BOOL
wave_out_set_format(WAVEFORMATEX * pwfx)
{
        ao_sample_format format;

        printf("%d\n",pwfx->wBitsPerSample);
        format.bits = pwfx->wBitsPerSample;
        format.channels = pwfx->nChannels;
        format.rate = 44100;
        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[8];

        while (1)
        {
                if (queue_lo == queue_hi)
                {
                        g_dsp_busy = 0;
                        return;
                }

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

                /* Resample 22050 -> 44100 */
                /* TODO: Do this for 11025, too... */
                memcpy(&expanded[0],out->p,g_samplewidth);
                memcpy(&expanded[2*g_samplewidth],out->p,g_samplewidth);
                out->p += 2;
                memcpy(&expanded[1*g_samplewidth],out->p,g_samplewidth);
                memcpy(&expanded[3*g_samplewidth],out->p,g_samplewidth);
                out->p += 2;

                ao_play(o_device, expanded, g_samplewidth*4);

                if (out->p == out->end)
                {
                        rdpsnd_send_completion(packet->tick, packet->index);
                        free(out->data);
                        queue_lo = (queue_lo + 1) % MAX_QUEUE;
                } else {
                        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
31			int g_dsp_fd;
32			ao_device *o_device = NULL;
33			int default_driver;
34			BOOL g_dsp_busy = False;
35			static short g_samplewidth;
36
37			static struct audio_packet
38			{
39			struct stream s;
40			uint16 tick;
41			uint8 index;
42			} packet_queue[MAX_QUEUE];
43			static unsigned int queue_hi, queue_lo;
44
45			BOOL
46			wave_out_open(void)
47			{
48			ao_sample_format format;
49
50			ao_initialize();
51			default_driver = ao_default_driver_id();
52
53			format.bits = 16;
54			format.channels = 2;
55			format.rate = 44100;
56			format.byte_format = AO_FMT_LITTLE;
57
58			o_device = ao_open_live(default_driver, &format, NULL);
59			if (o_device == NULL)
60			{
61			return False;
62			}
63
64			g_dsp_fd = 0;
65			queue_lo = queue_hi = 0;
66
67			return True;
68			}
69
70			void
71			wave_out_close(void)
72			{
73			/* Ack all remaining packets */
74			while (queue_lo != queue_hi)
75			{
76			rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index);
77			free(packet_queue[queue_lo].s.data);
78			queue_lo = (queue_lo + 1) % MAX_QUEUE;
79			}
80
81			if (o_device != NULL)
82			ao_close(o_device);
83			ao_shutdown();
84			}
85
86			BOOL
87			wave_out_format_supported(WAVEFORMATEX * pwfx)
88			{
89			if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
90			return False;
91			if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
92			return False;
93			if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
94			return False;
95			/* The only common denominator between libao output drivers is a sample-rate of
96			44100, windows gives a max of 22050. we need to upsample that...
97			TODO: support 11025, too */
98			if (pwfx->nSamplesPerSec != 22050)
99			return False;
100
101			return True;
102			}
103
104			BOOL
105			wave_out_set_format(WAVEFORMATEX * pwfx)
106			{
107			ao_sample_format format;
108
109			printf("%d\n",pwfx->wBitsPerSample);
110			format.bits = pwfx->wBitsPerSample;
111			format.channels = pwfx->nChannels;
112			format.rate = 44100;
113			format.byte_format = AO_FMT_LITTLE;
114
115			g_samplewidth = pwfx->wBitsPerSample / 8;
116
117			if(o_device != NULL)
118			ao_close(o_device);
119
120			o_device = ao_open_live(default_driver, &format, NULL);
121			if (o_device == NULL)
122			{
123			return False;
124			}
125
126
127			return True;
128			}
129
130			void
131			wave_out_volume(uint16 left, uint16 right)
132			{
133			}
134
135			void
136			wave_out_write(STREAM s, uint16 tick, uint8 index)
137			{
138			struct audio_packet *packet = &packet_queue[queue_hi];
139			unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
140
141			if (next_hi == queue_lo)
142			{
143			error("No space to queue audio packet\n");
144			return;
145			}
146
147			queue_hi = next_hi;
148
149			packet->s = *s;
150			packet->tick = tick;
151			packet->index = index;
152			packet->s.p += 4;
153
154			/* we steal the data buffer from s, give it a new one */
155			s->data = malloc(s->size);
156
157			if (!g_dsp_busy)
158			wave_out_play();
159			}
160
161			void
162			wave_out_play(void)
163			{
164			struct audio_packet *packet;
165			STREAM out;
166			unsigned char expanded[8];
167
168			while (1)
169			{
170			if (queue_lo == queue_hi)
171			{
172			g_dsp_busy = 0;
173			return;
174			}
175
176			packet = &packet_queue[queue_lo];
177			out = &packet->s;
178
179			/* Resample 22050 -> 44100 */
180			/* TODO: Do this for 11025, too... */
181			memcpy(&expanded[0],out->p,g_samplewidth);
182			memcpy(&expanded[2*g_samplewidth],out->p,g_samplewidth);
183			out->p += 2;
184			memcpy(&expanded[1*g_samplewidth],out->p,g_samplewidth);
185			memcpy(&expanded[3*g_samplewidth],out->p,g_samplewidth);
186			out->p += 2;
187
188			ao_play(o_device, expanded, g_samplewidth*4);
189
190			if (out->p == out->end)
191			{
192			rdpsnd_send_completion(packet->tick, packet->index);
193			free(out->data);
194			queue_lo = (queue_lo + 1) % MAX_QUEUE;
195			} else {
196			g_dsp_busy = 1;
197			return;
198			}
199			}
200			}