201 lines
4.3 KiB
C
201 lines
4.3 KiB
C
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/*
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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
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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 <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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#define MAX_QUEUE 10
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int g_dsp_fd;
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ao_device *o_device = NULL;
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int default_driver;
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BOOL g_dsp_busy = False;
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static short g_samplewidth;
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static struct audio_packet
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{
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struct stream s;
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uint16 tick;
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uint8 index;
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} packet_queue[MAX_QUEUE];
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static unsigned int queue_hi, queue_lo;
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BOOL
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wave_out_open(void)
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{
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ao_sample_format format;
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ao_initialize();
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default_driver = ao_default_driver_id();
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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_LITTLE;
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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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g_dsp_fd = 0;
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queue_lo = queue_hi = 0;
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return True;
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}
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void
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wave_out_close(void)
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{
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/* Ack all remaining packets */
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while (queue_lo != queue_hi)
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{
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rdpsnd_send_completion(packet_queue[queue_lo].tick, packet_queue[queue_lo].index);
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free(packet_queue[queue_lo].s.data);
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queue_lo = (queue_lo + 1) % MAX_QUEUE;
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}
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if (o_device != NULL)
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ao_close(o_device);
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ao_shutdown();
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}
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BOOL
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wave_out_format_supported(WAVEFORMATEX * pwfx)
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{
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if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
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return False;
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if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
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return False;
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if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
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return False;
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/* The only common denominator between libao output drivers is a sample-rate of
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44100, windows gives a max of 22050. we need to upsample that...
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TODO: support 11025, too */
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if (pwfx->nSamplesPerSec != 22050)
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return False;
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return True;
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}
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BOOL
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wave_out_set_format(WAVEFORMATEX * pwfx)
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{
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ao_sample_format format;
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printf("%d\n",pwfx->wBitsPerSample);
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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_LITTLE;
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g_samplewidth = pwfx->wBitsPerSample / 8;
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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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return True;
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}
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void
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wave_out_volume(uint16 left, uint16 right)
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{
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}
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void
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wave_out_write(STREAM s, uint16 tick, uint8 index)
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{
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struct audio_packet *packet = &packet_queue[queue_hi];
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unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
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if (next_hi == queue_lo)
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{
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error("No space to queue audio packet\n");
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return;
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}
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queue_hi = next_hi;
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packet->s = *s;
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packet->tick = tick;
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packet->index = index;
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packet->s.p += 4;
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/* we steal the data buffer from s, give it a new one */
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s->data = malloc(s->size);
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if (!g_dsp_busy)
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wave_out_play();
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}
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void
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wave_out_play(void)
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{
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struct audio_packet *packet;
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STREAM out;
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unsigned char expanded[8];
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while (1)
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{
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if (queue_lo == queue_hi)
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{
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g_dsp_busy = 0;
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return;
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}
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packet = &packet_queue[queue_lo];
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out = &packet->s;
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/* Resample 22050 -> 44100 */
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/* TODO: Do this for 11025, too... */
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memcpy(&expanded[0],out->p,g_samplewidth);
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memcpy(&expanded[2*g_samplewidth],out->p,g_samplewidth);
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out->p += 2;
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memcpy(&expanded[1*g_samplewidth],out->p,g_samplewidth);
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memcpy(&expanded[3*g_samplewidth],out->p,g_samplewidth);
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out->p += 2;
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ao_play(o_device, expanded, g_samplewidth*4);
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if (out->p == out->end)
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{
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rdpsnd_send_completion(packet->tick, packet->index);
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free(out->data);
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queue_lo = (queue_lo + 1) % MAX_QUEUE;
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} else {
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g_dsp_busy = 1;
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return;
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}
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}
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}
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