reactos/modules/rosapps/applications/net/tsclient/rdesktop/rdpsnd_libao.c

274 lines
6.2 KiB
C

/* -*- c-basic-offset: 8 -*-
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "rdesktop.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ao/ao.h>
#include <sys/time.h>
#define MAX_QUEUE 10
#define WAVEOUTBUF 16
int This->dsp_;
ao_device *o_device = NULL;
int default_driver;
int g_samplerate;
int This->channels;
BOOL This->dsp_bu = False;
static BOOL g_reopened;
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;
This->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;
}
This->dsp_ = 0;
queue_lo = queue_hi = 0;
g_reopened = True;
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;
This->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;
}
g_reopened = True;
return True;
}
void
wave_out_volume(uint16 left, uint16 right)
{
warning("volume changes not supported with libao-output\n");
}
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 (!This->dsp_bu)
wave_out_play();
}
void
wave_out_play(void)
{
struct audio_packet *packet;
STREAM out;
char outbuf[WAVEOUTBUF];
int offset, len, i;
static long prev_s, prev_us;
unsigned int duration;
struct timeval tv;
int next_tick;
if (g_reopened)
{
g_reopened = False;
gettimeofday(&tv, NULL);
prev_s = tv.tv_sec;
prev_us = tv.tv_usec;
}
if (queue_lo == queue_hi)
{
This->dsp_bu = 0;
return;
}
packet = &packet_queue[queue_lo];
out = &packet->s;
if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)
{
next_tick = packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;
}
else
{
next_tick = (packet->tick + 65535) % 65536;
}
len = 0;
if (g_samplerate == 22050)
{
/* Resample to 44100 */
for (i = 0; (i < ((WAVEOUTBUF / 4) * (3 - g_samplewidth))) && (out->p < out->end);
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 (This->channels == 2)
offset = ((i * 2) - (i & 1)) * g_samplewidth;
else
offset = (i * 2) * g_samplewidth;
memcpy(&outbuf[offset], out->p, g_samplewidth);
memcpy(&outbuf[This->channels * g_samplewidth + offset], out->p, g_samplewidth);
out->p += g_samplewidth;
len += 2 * g_samplewidth;
}
}
else
{
len = (WAVEOUTBUF > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTBUF;
memcpy(outbuf, out->p, len);
out->p += len;
}
ao_play(o_device, outbuf, len);
gettimeofday(&tv, NULL);
duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
if (packet->tick > next_tick)
next_tick += 65536;
if ((out->p == out->end) || duration > next_tick - packet->tick + 500)
{
prev_s = tv.tv_sec;
prev_us = tv.tv_usec;
if (abs((next_tick - packet->tick) - duration) > 20)
{
DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
(packet->tick + duration) % 65536, next_tick % 65536));
}
/* Until all drivers are using the windows sound-ticks, we need to
substract the 50 ticks added later by rdpsnd.c */
rdpsnd_send_completion(((packet->tick + duration) % 65536) - 50, packet->index);
free(out->data);
queue_lo = (queue_lo + 1) % MAX_QUEUE;
}
This->dsp_bu = 1;
return;
}