c6712a8945
more correctly. git-svn-id: svn://svn.code.sf.net/p/rdesktop/code/trunk/rdesktop@1345 423420c4-83ab-492f-b58f-81f9feb106b5
217 lines
4.4 KiB
C
217 lines
4.4 KiB
C
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Sound Channel Process Functions - libao-driver
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Copyright (C) Matthew Chapman 2003
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Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
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Copyright (C) Michael Gernoth mike@zerfleddert.de 2005-2006
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "rdesktop.h"
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#include "rdpsnd.h"
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#include "rdpsnd_dsp.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ao/ao.h>
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#include <sys/time.h>
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#define WAVEOUTLEN 16
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static ao_device *o_device = NULL;
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static int default_driver;
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static BOOL reopened;
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static char *libao_device = NULL;
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void libao_play(void);
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void
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libao_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
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{
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}
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void
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libao_check_fds(fd_set * rfds, fd_set * wfds)
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{
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if (o_device == NULL)
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return;
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if (!rdpsnd_queue_empty())
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libao_play();
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}
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BOOL
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libao_open(void)
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{
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ao_sample_format format;
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ao_initialize();
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if (libao_device)
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{
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default_driver = ao_driver_id(libao_device);
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}
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else
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{
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default_driver = ao_default_driver_id();
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}
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format.bits = 16;
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format.channels = 2;
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format.rate = 44100;
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format.byte_format = AO_FMT_NATIVE;
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o_device = ao_open_live(default_driver, &format, NULL);
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if (o_device == NULL)
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{
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return False;
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}
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reopened = True;
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return True;
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}
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void
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libao_close(void)
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{
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/* Ack all remaining packets */
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while (!rdpsnd_queue_empty())
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{
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rdpsnd_queue_next(0);
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}
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if (o_device != NULL)
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ao_close(o_device);
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o_device = NULL;
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ao_shutdown();
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}
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BOOL
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libao_set_format(WAVEFORMATEX * pwfx)
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{
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ao_sample_format format;
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format.bits = pwfx->wBitsPerSample;
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format.channels = pwfx->nChannels;
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format.rate = 44100;
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format.byte_format = AO_FMT_NATIVE;
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if (o_device != NULL)
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ao_close(o_device);
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o_device = ao_open_live(default_driver, &format, NULL);
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if (o_device == NULL)
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{
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return False;
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}
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if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
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{
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return False;
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}
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reopened = True;
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return True;
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}
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void
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libao_play(void)
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{
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struct audio_packet *packet;
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STREAM out;
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int len;
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static long prev_s, prev_us;
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unsigned int duration;
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struct timeval tv;
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int next_tick;
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if (reopened)
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{
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reopened = False;
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gettimeofday(&tv, NULL);
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prev_s = tv.tv_sec;
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prev_us = tv.tv_usec;
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}
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/* We shouldn't be called if the queue is empty, but still */
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if (rdpsnd_queue_empty())
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return;
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packet = rdpsnd_queue_current_packet();
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out = &packet->s;
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next_tick = rdpsnd_queue_next_tick();
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len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
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ao_play(o_device, (char *) out->p, len);
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out->p += len;
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gettimeofday(&tv, NULL);
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duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
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if (packet->tick > next_tick)
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next_tick += 65536;
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if ((out->p == out->end) || duration > next_tick - packet->tick + 500)
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{
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prev_s = tv.tv_sec;
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prev_us = tv.tv_usec;
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if (abs((next_tick - packet->tick) - duration) > 20)
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{
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DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
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DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
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(packet->tick + duration) % 65536, next_tick % 65536));
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}
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rdpsnd_queue_next(duration);
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}
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}
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static struct audio_driver libao_driver = {
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.name = "libao",
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.description = "libao output driver, default device: system dependent",
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.add_fds = libao_add_fds,
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.check_fds = libao_check_fds,
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.wave_out_open = libao_open,
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.wave_out_close = libao_close,
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.wave_out_format_supported = rdpsnd_dsp_resample_supported,
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.wave_out_set_format = libao_set_format,
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.wave_out_volume = rdpsnd_dsp_softvol_set,
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.need_byteswap_on_be = 1,
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.need_resampling = 1,
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};
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struct audio_driver *
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libao_register(char *options)
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{
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if (options)
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{
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libao_device = xstrdup(options);
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}
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return &libao_driver;
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}
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