/* -*- 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "rdesktop.h" #include #include #include #include #include #define MAX_QUEUE 10 #define WAVEOUTBUF 16 int g_dsp_fd; BOOL g_dsp_busy = False; static ao_device *o_device = NULL; static int default_driver; static int samplerate; static int audiochannels; static BOOL reopened; static short 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; audiochannels = 2; format.rate = 44100; 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; 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; audiochannels = pwfx->nChannels; format.rate = 44100; samplerate = pwfx->nSamplesPerSec; format.byte_format = AO_FMT_LITTLE; 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; } 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 (!g_dsp_busy) 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 (reopened) { reopened = False; gettimeofday(&tv, NULL); prev_s = tv.tv_sec; prev_us = tv.tv_usec; } if (queue_lo == queue_hi) { g_dsp_busy = 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 (samplerate == 22050) { /* Resample to 44100 */ for (i = 0; (i < ((WAVEOUTBUF / 4) * (3 - 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 (audiochannels == 2) offset = ((i * 2) - (i & 1)) * samplewidth; else offset = (i * 2) * samplewidth; memcpy(&outbuf[offset], out->p, samplewidth); memcpy(&outbuf[audiochannels * samplewidth + offset], out->p, samplewidth); out->p += samplewidth; len += 2 * 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; } g_dsp_busy = 1; return; }