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Diffstat (limited to 'src/rmd_opendev.c')
| -rw-r--r-- | src/rmd_opendev.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/rmd_opendev.c b/src/rmd_opendev.c new file mode 100644 index 0000000..37fb33c --- /dev/null +++ b/src/rmd_opendev.c @@ -0,0 +1,189 @@ +/****************************************************************************** +* recordMyDesktop * +******************************************************************************* +* * +* Copyright (C) 2006,2007,2008 John Varouhakis * +* * +* * +* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * +* * +* * +* * +* For further information contact me at johnvarouhakis@gmail.com * +******************************************************************************/ + +#include "config.h" +#include "rmd_opendev.h" + +#ifdef HAVE_LIBASOUND + #include <alsa/asoundlib.h> +#else + #include <sys/ioctl.h> + #include <sys/soundcard.h> +#endif + +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <fcntl.h> + + +#ifdef HAVE_LIBASOUND + +snd_pcm_t *rmdOpenDev( const char *pcm_dev, + unsigned int *channels, + unsigned int *frequency, + snd_pcm_uframes_t *buffsize, + snd_pcm_uframes_t *periodsize, + unsigned int *periodtime, + int *hard_pause) { + + snd_pcm_t *mhandle; + snd_pcm_hw_params_t *hwparams; + unsigned int periods = 2; + unsigned int exactrate = *frequency; + + // The compiler might warn us because the expansion starts with + // assert(&hwparams) + snd_pcm_hw_params_alloca(&hwparams); + + if (snd_pcm_open(&mhandle, pcm_dev, SND_PCM_STREAM_CAPTURE, SND_PCM_ASYNC) < 0) { + fprintf(stderr, "Couldn't open PCM device %s\n", pcm_dev); + return NULL; + } else + fprintf(stderr, "Opened PCM device %s\n", pcm_dev); + + if (snd_pcm_hw_params_any(mhandle, hwparams) < 0) { + fprintf(stderr, "Couldn't configure PCM device.\n"); + return NULL; + } + + if (snd_pcm_hw_params_set_access(mhandle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) { + fprintf(stderr, "Couldn't set access.\n"); + return NULL; + } + + if (snd_pcm_hw_params_set_format(mhandle, hwparams, SND_PCM_FORMAT_S16_LE) < 0) { + fprintf(stderr, "Couldn't set format.\n"); + return NULL; + } + + if (snd_pcm_hw_params_set_rate_near(mhandle, hwparams, &exactrate, 0) < 0) { + fprintf(stderr, "Couldn't set frequency.\n"); + return NULL; + } + + if (*frequency != exactrate) { + fprintf(stderr, "Playback frequency %dHz is not available...\n" + "Using %dHz instead.\n", + *frequency, exactrate); + + *frequency = exactrate; + } + + if (snd_pcm_hw_params_set_channels_near(mhandle, hwparams, channels) < 0) { + fprintf(stderr, "Couldn't set channels number.\n"); + return NULL; + } + + if (*channels>2) { + fprintf(stderr, "Channels number should be 1(mono) or 2(stereo).\n"); + return NULL; + } + + if (snd_pcm_hw_params_set_periods_near(mhandle, hwparams, &periods, 0) < 0) { + fprintf(stderr, "Couldn't set periods.\n"); + return NULL; + } + + if (snd_pcm_hw_params_set_buffer_size_near(mhandle, hwparams, buffsize) < 0) { + fprintf(stderr, "Couldn't set buffer size.\n"); + return NULL; + } + + if (snd_pcm_hw_params(mhandle, hwparams) < 0) { + fprintf(stderr, "Couldn't set hardware parameters.\n"); + return NULL; + } + + if (hard_pause != NULL) { + if (!snd_pcm_hw_params_can_pause(hwparams)) + *hard_pause = 1; + } + + if (periodsize != NULL) + snd_pcm_hw_params_get_period_size(hwparams, periodsize, 0); + + if (periodtime != NULL) + snd_pcm_hw_params_get_period_time(hwparams, periodtime, 0); + + fprintf(stderr, + "Recording on device %s is set to:\n%d channels at %dHz\n", + pcm_dev, *channels, *frequency); + + snd_pcm_prepare(mhandle); + + return mhandle; +} + +#else + +int rmdOpenDev(const char *pcm_dev, unsigned int channels, unsigned int frequency) { + int fd ; + unsigned int value; + + fd = open(pcm_dev, O_RDONLY); + if (fd < 0) + return -1; + + if (ioctl(fd, SNDCTL_DSP_GETFMTS, &value) < 0) { + fprintf(stderr, "Couldn't get audio format list\n"); + return -1; + } + + if (value & AFMT_S16_LE) { + value = AFMT_S16_LE; + } else if (value & AFMT_S16_BE) { + value = AFMT_S16_BE; + } else { + fprintf(stderr, "Soundcard doesn't support signed 16-bit-data\n"); + return -1; + } + + if (ioctl(fd, SNDCTL_DSP_SETFMT, &value) < 0) { + fprintf(stderr, "Couldn't set audio format\n" ); + return -1; + } + + value = channels; + if (ioctl(fd, SNDCTL_DSP_CHANNELS, &value) < 0) { + fprintf(stderr, "Cannot set the number of channels\n" ); + return -1; + } + + value = frequency; + if (ioctl(fd, SNDCTL_DSP_SPEED, &value) < 0) { + fprintf(stderr, "Couldn't set audio frequency\n" ); + return -1; + } + + if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) & ~O_NONBLOCK) < 0) { + fprintf(stderr, "Couldn't set audio blocking mode\n" ); + return -1; + } + + return fd; +} +#endif |