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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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|
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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 <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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|
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#define MAX_QUEUE 10 |
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|
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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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int g_samplerate; |
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BOOL g_dsp_busy = False; |
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static short g_samplewidth; |
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|
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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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|
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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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|
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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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format.rate = 44100; |
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g_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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queue_lo = queue_hi = 0; |
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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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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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|
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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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|
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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, 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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wave_out_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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format.rate = 44100; |
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g_samplerate = pwfx->nSamplesPerSec; |
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format.byte_format = AO_FMT_LITTLE; |
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|
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g_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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|
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return True; |
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} |
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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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|
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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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|
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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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|
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queue_hi = next_hi; |
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|
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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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|
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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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|
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if (!g_dsp_busy) |
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wave_out_play(); |
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} |
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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[16]; |
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int offset,len,i; |
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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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|
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packet = &packet_queue[queue_lo]; |
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out = &packet->s; |
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|
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len = 0; |
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|
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if (g_samplerate == 22050 ) |
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{ |
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/* Resample to 44100 */ |
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for(i=0; (i<(2*(3-g_samplewidth))) && (out->p < out->end); i++) |
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{ |
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offset=i*4*g_samplewidth; |
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memcpy(&expanded[0*g_samplewidth+offset],out->p,g_samplewidth); |
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memcpy(&expanded[2*g_samplewidth+offset],out->p,g_samplewidth); |
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out->p += 2; |
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|
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memcpy(&expanded[1*g_samplewidth+offset],out->p,g_samplewidth); |
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memcpy(&expanded[3*g_samplewidth+offset],out->p,g_samplewidth); |
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out->p += 2; |
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len += 4*g_samplewidth; |
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} |
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} |
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else |
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{ |
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len = (16 > (out->end - out->p)) ? (out->end - out->p) : 16; |
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memcpy(expanded,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, expanded, len); |
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|
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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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} |
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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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