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/* -*- 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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|
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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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|
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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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|
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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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|
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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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|
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#define WAVEOUTBUF 16 |
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|
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static ao_device *o_device = NULL; |
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static int default_driver; |
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static int samplerate; |
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static int audiochannels; |
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static BOOL reopened; |
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static short samplewidth; |
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static char *libao_device = NULL; |
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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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static int warned = 0; |
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|
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if (!warned && libao_device) |
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{ |
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warning("device-options not supported for libao-driver\n"); |
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warned = 1; |
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} |
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|
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ao_initialize(); |
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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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audiochannels = 2; |
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format.rate = 44100; |
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samplerate = 44100; |
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format.byte_format = AO_FMT_LITTLE; |
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|
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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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|
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g_dsp_fd = 0; |
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rdpsnd_queue_init(); |
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|
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reopened = True; |
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|
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return True; |
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} |
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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_send_completion(rdpsnd_queue_current_packet()->tick, |
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rdpsnd_queue_current_packet()->index); |
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rdpsnd_queue_next(); |
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} |
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|
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if (o_device != NULL) |
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ao_close(o_device); |
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|
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ao_shutdown(); |
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} |
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|
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BOOL |
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libao_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, we need to upsample 22050 to it */ |
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if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050)) |
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return False; |
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|
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return True; |
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} |
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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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|
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format.bits = pwfx->wBitsPerSample; |
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format.channels = pwfx->nChannels; |
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audiochannels = pwfx->nChannels; |
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format.rate = 44100; |
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samplerate = pwfx->nSamplesPerSec; |
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format.byte_format = AO_FMT_LITTLE; |
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|
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samplewidth = pwfx->wBitsPerSample / 8; |
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|
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if (o_device != NULL) |
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ao_close(o_device); |
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|
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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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|
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reopened = True; |
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|
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return True; |
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} |
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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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char outbuf[WAVEOUTBUF]; |
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int offset, len, i; |
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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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|
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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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|
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if (rdpsnd_queue_empty()) |
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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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|
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packet = rdpsnd_queue_current_packet(); |
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out = &packet->s; |
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|
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next_tick = rdpsnd_queue_next_tick(); |
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|
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len = 0; |
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|
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if (samplerate == 22050) |
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{ |
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/* Resample to 44100 */ |
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for (i = 0; (i < ((WAVEOUTBUF / 4) * (3 - samplewidth))) && (out->p < out->end); |
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i++) |
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{ |
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/* On a stereo-channel we must make sure that left and right |
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does not get mixed up, so we need to expand the sample- |
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data with channels in mind: 1234 -> 12123434 |
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If we have a mono-channel, we can expand the data by simply |
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doubling the sample-data: 1234 -> 11223344 */ |
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if (audiochannels == 2) |
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offset = ((i * 2) - (i & 1)) * samplewidth; |
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else |
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offset = (i * 2) * samplewidth; |
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|
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memcpy(&outbuf[offset], out->p, samplewidth); |
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memcpy(&outbuf[audiochannels * samplewidth + offset], out->p, samplewidth); |
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|
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out->p += samplewidth; |
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len += 2 * samplewidth; |
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} |
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} |
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else |
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{ |
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len = (WAVEOUTBUF > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTBUF; |
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memcpy(outbuf, out->p, len); |
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out->p += len; |
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} |
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|
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ao_play(o_device, outbuf, len); |
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|
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gettimeofday(&tv, NULL); |
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|
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duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000; |
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|
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if (packet->tick > next_tick) |
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next_tick += 65536; |
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|
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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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|
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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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|
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rdpsnd_send_completion(((packet->tick + duration) % 65536), packet->index); |
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rdpsnd_queue_next(); |
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} |
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|
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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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struct audio_driver * |
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libao_register(char *options) |
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{ |
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static struct audio_driver libao_driver; |
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|
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libao_driver.wave_out_write = rdpsnd_queue_write; |
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libao_driver.wave_out_open = libao_open; |
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libao_driver.wave_out_close = libao_close; |
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libao_driver.wave_out_format_supported = libao_format_supported; |
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libao_driver.wave_out_set_format = libao_set_format; |
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libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set; |
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libao_driver.wave_out_play = libao_play; |
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libao_driver.name = xstrdup("libao"); |
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libao_driver.description = xstrdup("libao output driver"); |
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libao_driver.need_byteswap_on_be = 0; |
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libao_driver.next = NULL; |
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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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|
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return &libao_driver; |
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} |
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