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/* |
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rdesktop: A Remote Desktop Protocol client. |
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Sound DSP routines |
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Copyright (C) Michael Gernoth 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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#define MAX_VOLUME 65535 |
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static uint16 softvol_left = MAX_VOLUME; |
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static uint16 softvol_right = MAX_VOLUME; |
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static uint32 resample_to_srate = 44100; |
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static uint16 resample_to_bitspersample = 16; |
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static uint16 resample_to_channels = 2; |
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|
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void |
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rdpsnd_dsp_softvol_set(uint16 left, uint16 right) |
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{ |
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softvol_left = left; |
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softvol_right = right; |
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DEBUG(("rdpsnd_dsp_softvol_set: left: %u, right: %u\n", left, right)); |
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} |
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void |
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rdpsnd_dsp_softvol(unsigned char *buffer, unsigned int size, WAVEFORMATEX * format) |
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{ |
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unsigned int factor_left, factor_right; |
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unsigned char *posin = buffer; |
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unsigned char *posout = buffer; |
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if ((softvol_left == MAX_VOLUME) && (softvol_right == MAX_VOLUME)) |
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return; |
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factor_left = (softvol_left * 256) / MAX_VOLUME; |
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factor_right = (softvol_right * 256) / MAX_VOLUME; |
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|
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if (format->nChannels == 1) |
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{ |
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factor_left = factor_right = (factor_left + factor_right) / 2; |
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} |
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if (format->wBitsPerSample == 8) |
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{ |
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sint8 val; |
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|
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while (posout < buffer + size) |
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{ |
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/* Left */ |
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val = *posin++; |
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val = (val * factor_left) >> 8; |
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*posout++ = val; |
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/* Right */ |
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val = *posin++; |
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val = (val * factor_right) >> 8; |
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*posout++ = val; |
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} |
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} |
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else |
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{ |
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sint16 val; |
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while (posout < buffer + size) |
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{ |
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/* Left */ |
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val = *posin++; |
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val |= *posin++ << 8; |
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val = (val * factor_left) >> 8; |
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*posout++ = val & 0xff; |
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*posout++ = val >> 8; |
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/* Right */ |
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val = *posin++; |
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val |= *posin++ << 8; |
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val = (val * factor_right) >> 8; |
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*posout++ = val & 0xff; |
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*posout++ = val >> 8; |
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} |
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} |
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DEBUG(("using softvol with factors left: %d, right: %d (%d/%d)\n", factor_left, |
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factor_right, format->wBitsPerSample, format->nChannels)); |
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} |
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void |
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rdpsnd_dsp_swapbytes(unsigned char *buffer, unsigned int size, WAVEFORMATEX * format) |
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{ |
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int i; |
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uint8 swap; |
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if (format->wBitsPerSample == 8) |
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return; |
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for (i = 0; i < size; i += 2) |
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{ |
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swap = *(buffer + i); |
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*(buffer + i) = *(buffer + i + 1); |
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*(buffer + i + 1) = swap; |
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} |
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} |
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BOOL |
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rdpsnd_dsp_resample_set(uint32 device_srate, uint16 device_bitspersample, uint16 device_channels) |
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{ |
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if (device_srate != 44100 && device_srate != 22050) |
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return False; |
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if (device_bitspersample != 16 && device_bitspersample != 8) |
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return False; |
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if (device_channels != 1 && device_channels != 2) |
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return False; |
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resample_to_srate = device_srate; |
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resample_to_bitspersample = device_bitspersample; |
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resample_to_channels = device_channels; |
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return True; |
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} |
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BOOL |
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rdpsnd_dsp_resample_supported(WAVEFORMATEX * format) |
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{ |
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if (format->wFormatTag != WAVE_FORMAT_PCM) |
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return False; |
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if ((format->nChannels != 1) && (format->nChannels != 2)) |
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return False; |
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if ((format->wBitsPerSample != 8) && (format->wBitsPerSample != 16)) |
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return False; |
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if ((format->nSamplesPerSec != 44100) && (format->nSamplesPerSec != 22050)) |
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return False; |
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return True; |
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} |
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uint32 |
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rdpsnd_dsp_resample(unsigned char **out, unsigned char *in, unsigned int size, |
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WAVEFORMATEX * format) |
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{ |
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static BOOL warned = False; |
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int outsize, offset; |
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int samplewidth = format->wBitsPerSample / 8; |
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int i; |
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if ((resample_to_bitspersample == format->wBitsPerSample) && |
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(resample_to_channels == format->nChannels) && |
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(resample_to_srate == format->nSamplesPerSec)) |
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return 0; |
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if ((resample_to_bitspersample != format->wBitsPerSample) || |
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(resample_to_channels != format->nChannels) || (format->nSamplesPerSec != 22050)) |
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{ |
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if (!warned) |
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{ |
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warning("unsupported resample-settings (%u/%u/%u), not resampling!\n", |
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format->nSamplesPerSec, format->wBitsPerSample, format->nChannels); |
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warned = True; |
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} |
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return 0; |
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} |
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outsize = size * 2; |
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*out = xmalloc(outsize); |
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/* Resample from 22050 to 44100 */ |
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for (i = 0; i < (size / samplewidth); 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 (resample_to_channels == 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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memcpy(*out + offset, in + (i * samplewidth), samplewidth); |
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memcpy(*out + (resample_to_channels * samplewidth + offset), |
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in + (i * samplewidth), samplewidth); |
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} |
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return outsize; |
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} |
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STREAM |
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rdpsnd_dsp_process(STREAM s, struct audio_driver * current_driver, WAVEFORMATEX * format) |
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{ |
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static struct stream out; |
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|
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/* softvol and byteswap do not change the amount of data they |
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return, so they can operate on the input-stream */ |
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if (current_driver->wave_out_volume == rdpsnd_dsp_softvol_set) |
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rdpsnd_dsp_softvol(s->data, s->size, format); |
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#ifdef B_ENDIAN |
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if (current_driver->need_byteswap_on_be) |
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rdpsnd_dsp_swapbytes(s->data, s->size, format); |
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#endif |
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out.data = NULL; |
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if (current_driver->wave_out_format_supported == rdpsnd_dsp_resample_supported) |
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out.size = rdpsnd_dsp_resample(&out.data, s->data, s->size, format); |
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if (out.data == NULL) |
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{ |
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out.data = xmalloc(s->size); |
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memcpy(out.data, s->data, s->size); |
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out.size = s->size; |
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} |
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out.p = out.data; |
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out.end = out.p + out.size; |
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return &out; |
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} |