| 1 | /* sound output via OSS */ |
| 2 | #include <stdio.h> |
| 3 | #include <sys/types.h> |
| 4 | #include <sys/stat.h> |
| 5 | #include <fcntl.h> |
| 6 | #include <sys/ioctl.h> |
| 7 | #include <sys/soundcard.h> |
| 8 | #include <unistd.h> |
| 9 | |
| 10 | #include "sndout_oss.h" |
| 11 | |
| 12 | static int sounddev = -1, mixerdev = -1; |
| 13 | static int can_write_safe; |
| 14 | |
| 15 | |
| 16 | int sndout_oss_init(void) |
| 17 | { |
| 18 | if (mixerdev >= 0) close(mixerdev); |
| 19 | mixerdev = open("/dev/mixer", O_RDWR); |
| 20 | if (mixerdev == -1) |
| 21 | { |
| 22 | perror("open(\"/dev/mixer\")"); |
| 23 | } |
| 24 | |
| 25 | return 0; |
| 26 | } |
| 27 | |
| 28 | void sndout_oss_stop(void) |
| 29 | { |
| 30 | if (sounddev < 0) |
| 31 | return; |
| 32 | |
| 33 | ioctl(sounddev, SOUND_PCM_SYNC, 0); |
| 34 | close(sounddev); |
| 35 | sounddev = -1; |
| 36 | } |
| 37 | |
| 38 | int sndout_oss_start(int rate, int frame_samples, int stereo) |
| 39 | { |
| 40 | static int s_oldrate = 0, s_old_fsamples = 0, s_oldstereo = 0; |
| 41 | int frag, bsize, bits, ret; |
| 42 | |
| 43 | // GP2X: if no settings change, we don't need to do anything, |
| 44 | // since audio is never stopped there |
| 45 | if (sounddev >= 0 && rate == s_oldrate && s_old_fsamples == frame_samples && s_oldstereo == stereo) |
| 46 | return 0; |
| 47 | |
| 48 | sndout_oss_stop(); |
| 49 | sounddev = open("/dev/dsp", O_WRONLY); |
| 50 | if (sounddev == -1) |
| 51 | { |
| 52 | perror("open(\"/dev/dsp\")"); |
| 53 | sounddev = open("/dev/dsp1", O_WRONLY); |
| 54 | if (sounddev == -1) { |
| 55 | perror("open(\"/dev/dsp1\")"); |
| 56 | return -1; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | // calculate buffer size. We want to fit 1 frame worth of sound data. |
| 61 | // Also ignore mono because both GP2X and Wiz mixes mono to stereo anyway. |
| 62 | bsize = frame_samples << 2; |
| 63 | |
| 64 | for (frag = 0; bsize; bsize >>= 1, frag++) |
| 65 | ; |
| 66 | |
| 67 | frag |= 16 << 16; // fragment count |
| 68 | ret = ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag); |
| 69 | if (ret < 0) |
| 70 | perror("SNDCTL_DSP_SETFRAGMENT failed"); |
| 71 | |
| 72 | bits = 16; |
| 73 | ret = ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo); |
| 74 | if (ret == 0) |
| 75 | ret = ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits); |
| 76 | if (ret == 0) |
| 77 | ret = ioctl(sounddev, SNDCTL_DSP_SPEED, &rate); |
| 78 | if (ret < 0) |
| 79 | perror("failed to set audio format"); |
| 80 | |
| 81 | #ifdef __GP2X__ |
| 82 | // not sure if this is still needed (avoiding driver bugs?) |
| 83 | usleep(192*1024); |
| 84 | #endif |
| 85 | |
| 86 | printf("sndout_oss_start: %d/%dbit/%s, %d buffers of %i bytes\n", |
| 87 | rate, bits, stereo ? "stereo" : "mono", frag >> 16, 1 << (frag & 0xffff)); |
| 88 | |
| 89 | s_oldrate = rate; s_old_fsamples = frame_samples; s_oldstereo = stereo; |
| 90 | can_write_safe = 0; |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | int sndout_oss_write(const void *buff, int len) |
| 95 | { |
| 96 | return write(sounddev, buff, len); |
| 97 | } |
| 98 | |
| 99 | int sndout_oss_can_write(int bytes) |
| 100 | { |
| 101 | audio_buf_info bi; |
| 102 | int ret; |
| 103 | |
| 104 | #ifdef __GP2X__ |
| 105 | // note: SNDCTL_DSP_GETOSPACE crashes F100 kernel for some reason |
| 106 | // if called too early, so we work around here |
| 107 | if (can_write_safe++ < 8) |
| 108 | return 1; |
| 109 | #endif |
| 110 | ret = ioctl(sounddev, SNDCTL_DSP_GETOSPACE, &bi); |
| 111 | if (ret < 0) |
| 112 | return 1; |
| 113 | |
| 114 | // have enough bytes to write + 4 extra frags |
| 115 | return bi.bytes - bi.fragsize * 4 >= bytes ? 1 : 0; |
| 116 | } |
| 117 | |
| 118 | void sndout_oss_sync(void) |
| 119 | { |
| 120 | ioctl(sounddev, SOUND_PCM_SYNC, 0); |
| 121 | } |
| 122 | |
| 123 | void sndout_oss_setvol(int l, int r) |
| 124 | { |
| 125 | if (mixerdev < 0) return; |
| 126 | |
| 127 | l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r; |
| 128 | l<<=8; l|=r; |
| 129 | ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/ |
| 130 | } |
| 131 | |
| 132 | void sndout_oss_exit(void) |
| 133 | { |
| 134 | if (sounddev >= 0) close(sounddev); sounddev = -1; |
| 135 | if (mixerdev >= 0) close(mixerdev); mixerdev = -1; |
| 136 | } |
| 137 | |