stream/audio_in.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 #include "config.h"
   6
   7 #include "audio_in.h"
   8 #include "mp_msg.h"
   9 #include "help_mp.h"
  10 #include <string.h>
  11 #include <errno.h>
  12
  13 // sanitizes ai structure before calling other functions
  14 int audio_in_init(audio_in_t *ai, int type)
  15 {
  16     ai->type = type;
  17     ai->setup = 0;
  18
  19     ai->channels = -1;
  20     ai->samplerate = -1;
  21     ai->blocksize = -1;
  22     ai->bytes_per_sample = -1;
  23     ai->samplesize = -1;
  24
  25     switch (ai->type) {
  26 #ifdef CONFIG_ALSA
  27     case AUDIO_IN_ALSA:
  28         ai->alsa.handle = NULL;
  29         ai->alsa.log = NULL;
  30         ai->alsa.device = strdup("default");
  31         return 0;
  32 #endif
  33 #ifdef CONFIG_OSS_AUDIO
  34     case AUDIO_IN_OSS:
  35         ai->oss.audio_fd = -1;
  36         ai->oss.device = strdup("/dev/dsp");
  37         return 0;
  38 #endif
  39     default:
  40         return -1;
  41     }
  42 }
  43
  44 int audio_in_setup(audio_in_t *ai)
  45 {
  46
  47     switch (ai->type) {
  48 #ifdef CONFIG_ALSA
  49     case AUDIO_IN_ALSA:
  50         if (ai_alsa_init(ai) < 0) return -1;
  51         ai->setup = 1;
  52         return 0;
  53 #endif
  54 #ifdef CONFIG_OSS_AUDIO
  55     case AUDIO_IN_OSS:
  56         if (ai_oss_init(ai) < 0) return -1;
  57         ai->setup = 1;
  58         return 0;
  59 #endif
  60     default:
  61         return -1;
  62     }
  63 }
  64
  65 int audio_in_set_samplerate(audio_in_t *ai, int rate)
  66 {
  67     switch (ai->type) {
  68 #ifdef CONFIG_ALSA
  69     case AUDIO_IN_ALSA:
  70         ai->req_samplerate = rate;
  71         if (!ai->setup) return 0;
  72         if (ai_alsa_setup(ai) < 0) return -1;
  73         return ai->samplerate;
  74 #endif
  75 #ifdef CONFIG_OSS_AUDIO
  76     case AUDIO_IN_OSS:
  77         ai->req_samplerate = rate;
  78         if (!ai->setup) return 0;
  79         if (ai_oss_set_samplerate(ai) < 0) return -1;
  80         return ai->samplerate;
  81 #endif
  82     default:
  83         return -1;
  84     }
  85 }
  86
  87 int audio_in_set_channels(audio_in_t *ai, int channels)
  88 {
  89     switch (ai->type) {
  90 #ifdef CONFIG_ALSA
  91     case AUDIO_IN_ALSA:
  92         ai->req_channels = channels;
  93         if (!ai->setup) return 0;
  94         if (ai_alsa_setup(ai) < 0) return -1;
  95         return ai->channels;
  96 #endif
  97 #ifdef CONFIG_OSS_AUDIO
  98     case AUDIO_IN_OSS:
  99         ai->req_channels = channels;
 100         if (!ai->setup) return 0;
 101         if (ai_oss_set_channels(ai) < 0) return -1;
 102         return ai->channels;
 103 #endif
 104     default:
 105         return -1;
 106     }
 107 }
 108
 109 int audio_in_set_device(audio_in_t *ai, char *device)
 110 {
 111 #ifdef CONFIG_ALSA
 112     int i;
 113 #endif
 114     if (ai->setup) return -1;
 115     switch (ai->type) {
 116 #ifdef CONFIG_ALSA
 117     case AUDIO_IN_ALSA:
 118         if (ai->alsa.device) free(ai->alsa.device);
 119         ai->alsa.device = strdup(device);
 120         /* mplayer cannot handle colons in arguments */
 121         for (i = 0; i < (int)strlen(ai->alsa.device); i++) {
 122             if (ai->alsa.device[i] == '.') ai->alsa.device[i] = ':';
 123         }
 124         return 0;
 125 #endif
 126 #ifdef CONFIG_OSS_AUDIO
 127     case AUDIO_IN_OSS:
 128         if (ai->oss.device) free(ai->oss.device);
 129         ai->oss.device = strdup(device);
 130         return 0;
 131 #endif
 132     default:
 133         return -1;
 134     }
 135 }
 136
 137 int audio_in_uninit(audio_in_t *ai)
 138 {
 139     if (ai->setup) {
 140         switch (ai->type) {
 141 #ifdef CONFIG_ALSA
 142         case AUDIO_IN_ALSA:
 143             if (ai->alsa.log)
 144                 snd_output_close(ai->alsa.log);
 145             if (ai->alsa.handle) {
 146                 snd_pcm_close(ai->alsa.handle);
 147             }
 148             ai->setup = 0;
 149             return 0;
 150 #endif
 151 #ifdef CONFIG_OSS_AUDIO
 152         case AUDIO_IN_OSS:
 153             close(ai->oss.audio_fd);
 154             ai->setup = 0;
 155             return 0;
 156 #endif
 157         }
 158     }
 159     return -1;
 160 }
 161
 162 int audio_in_start_capture(audio_in_t *ai)
 163 {
 164     switch (ai->type) {
 165 #ifdef CONFIG_ALSA
 166     case AUDIO_IN_ALSA:
 167         return snd_pcm_start(ai->alsa.handle);
 168 #endif
 169 #ifdef CONFIG_OSS_AUDIO
 170     case AUDIO_IN_OSS:
 171         return 0;
 172 #endif
 173     default:
 174         return -1;
 175     }
 176 }
 177
 178 int audio_in_read_chunk(audio_in_t *ai, unsigned char *buffer)
 179 {
 180     int ret;
 181
 182     switch (ai->type) {
 183 #ifdef CONFIG_ALSA
 184     case AUDIO_IN_ALSA:
 185         ret = snd_pcm_readi(ai->alsa.handle, buffer, ai->alsa.chunk_size);
 186         if (ret != ai->alsa.chunk_size) {
 187             if (ret < 0) {
 188                 mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AUDIOIN_ErrReadingAudio, snd_strerror(ret));
 189                 if (ret == -EPIPE) {
 190                     if (ai_alsa_xrun(ai) == 0) {
 191                         mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AUDIOIN_XRUNSomeFramesMayBeLeftOut);
 192                     } else {
 193                         mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AUDIOIN_ErrFatalCannotRecover);
 194                     }
 195                 }
 196             } else {
 197                 mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AUDIOIN_NotEnoughSamples);
 198             }
 199             return -1;
 200         }
 201         return ret;
 202 #endif
 203 #ifdef CONFIG_OSS_AUDIO
 204     case AUDIO_IN_OSS:
 205         ret = read(ai->oss.audio_fd, buffer, ai->blocksize);
 206         if (ret != ai->blocksize) {
 207             if (ret < 0) {
 208                 mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AUDIOIN_ErrReadingAudio, strerror(errno));
 209             } else {
 210                 mp_msg(MSGT_TV, MSGL_ERR, MSGTR_MPDEMUX_AUDIOIN_NotEnoughSamples);
 211             }
 212             return -1;
 213         }
 214         return ret;
 215 #endif
 216     default:
 217         return -1;
 218     }
 219 }