libao2/ao_dxr2.c

   1 /*
   2  * DXR2 audio output driver
   3  *
   4  * This file is part of MPlayer.
   5  *
   6  * MPlayer is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * MPlayer is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <math.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/ioctl.h>
  25 #include <inttypes.h>
  26 #include <dxr2ioctl.h>
  27 #include "config.h"
  28 #include "mp_msg.h"
  29 #include "help_mp.h"
  30 #include "libavutil/common.h"
  31 #include "mpbswap.h"
  32
  33 #include "audio_out.h"
  34 #include "audio_out_internal.h"
  35 #include "libaf/af_format.h"
  36 #include "libmpdemux/mpeg_packetizer.h"
  37
  38
  39 static const ao_info_t info =
  40 {
  41         "DXR2 audio output",
  42         "dxr2",
  43         "Tobias Diedrich <ranma+mplayer@tdiedrich.de>",
  44         ""
  45 };
  46
  47 LIBAO_EXTERN(dxr2)
  48
  49 static int volume=19;
  50 static int last_freq_id = -1;
  51 extern int dxr2_fd;
  52
  53 // to set/get/query special features/parameters
  54 static int control(int cmd,void *arg){
  55   switch(cmd){
  56   case AOCONTROL_GET_VOLUME:
  57     if(dxr2_fd > 0) {
  58       ao_control_vol_t* vol = (ao_control_vol_t*)arg;
  59       vol->left = vol->right = volume * 19.0 / 100.0;
  60       return CONTROL_OK;
  61     }
  62     return CONTROL_ERROR;
  63   case AOCONTROL_SET_VOLUME:
  64     if(dxr2_fd > 0) {
  65       dxr2_oneArg_t v;
  66       float diff;
  67       ao_control_vol_t* vol = (ao_control_vol_t*)arg;
  68       // We need this trick because the volume stepping is often too small
  69       diff = ((vol->left+vol->right) / 2 - (volume*19.0/100.0)) * 19.0 / 100.0;
  70       v.arg = volume + (diff > 0 ? ceil(diff) : floor(diff));
  71       if(v.arg > 19) v.arg = 19;
  72       if(v.arg < 0) v.arg = 0;
  73       if(v.arg != volume) {
  74         volume = v.arg;
  75         if( ioctl(dxr2_fd,DXR2_IOC_SET_AUDIO_VOLUME,&v) < 0) {
  76           mp_tmsg(MSGT_AO,MSGL_ERR,"[AO DXR2] Setting volume to %d failed.\n",volume);
  77           return CONTROL_ERROR;
  78         }
  79       }
  80       return CONTROL_OK;
  81     }
  82     return CONTROL_ERROR;
  83   }
  84   return CONTROL_UNKNOWN;
  85 }
  86
  87 static int freq=0;
  88 static int freq_id=0;
  89
  90 // open & setup audio device
  91 // return: 1=success 0=fail
  92 static int init(int rate,int channels,int format,int flags){
  93
  94         if(dxr2_fd <= 0)
  95           return 0;
  96
  97         last_freq_id = -1;
  98
  99         ao_data.outburst=2048;
 100         ao_data.samplerate=rate;
 101         ao_data.channels=channels;
 102         ao_data.buffersize=2048;
 103         ao_data.bps=rate*4;
 104         ao_data.format=format;
 105         freq=rate;
 106
 107         switch(rate){
 108         case 48000:
 109                 freq_id=DXR2_AUDIO_FREQ_48;
 110                 break;
 111         case 96000:
 112                 freq_id=DXR2_AUDIO_FREQ_96;
 113                 break;
 114         case 44100:
 115                 freq_id=DXR2_AUDIO_FREQ_441;
 116                 break;
 117         case 32000:
 118                 freq_id=DXR2_AUDIO_FREQ_32;
 119                 break;
 120         case 22050:
 121                 freq_id=DXR2_AUDIO_FREQ_2205;
 122                 break;
 123 #ifdef DXR2_AUDIO_FREQ_24
 124         // This is not yet in the dxr2 driver CVS
 125         // you can get the patch at
 126         // http://www.tdiedrich.de/~ranma/patches/dxr2.pcm1723.20020513
 127         case 24000:
 128                 freq_id=DXR2_AUDIO_FREQ_24;
 129                 break;
 130         case 64000:
 131                 freq_id=DXR2_AUDIO_FREQ_64;
 132                 break;
 133         case 88200:
 134                 freq_id=DXR2_AUDIO_FREQ_882;
 135                 break;
 136 #endif
 137         default:
 138                 mp_tmsg(MSGT_AO,MSGL_ERR,"[AO DXR2] %d Hz not supported, try to resample.\n",rate);
 139                 return 0;
 140         }
 141
 142         return 1;
 143 }
 144
 145 // close audio device
 146 static void uninit(int immed){
 147
 148 }
 149
 150 // stop playing and empty buffers (for seeking/pause)
 151 static void reset(void){
 152
 153 }
 154
 155 // stop playing, keep buffers (for pause)
 156 static void audio_pause(void)
 157 {
 158     // for now, just call reset();
 159     reset();
 160 }
 161
 162 // resume playing, after audio_pause()
 163 static void audio_resume(void)
 164 {
 165 }
 166
 167 extern int vo_pts;
 168 // return: how many bytes can be played without blocking
 169 static int get_space(void){
 170     float x=(float)(vo_pts-ao_data.pts)/90000.0;
 171     int y;
 172     if(x<=0) return 0;
 173     y=freq*4*x;y/=ao_data.outburst;y*=ao_data.outburst;
 174     if(y>32768) y=32768;
 175     return y;
 176 }
 177
 178 static void dxr2_send_lpcm_packet(unsigned char* data,int len,int id,unsigned int timestamp,int freq_id)
 179 {
 180   int write_dxr2(const unsigned char *data, int len);
 181
 182   if(dxr2_fd < 0) {
 183     mp_msg(MSGT_AO,MSGL_ERR,"DXR2 fd is not valid\n");
 184     return;
 185   }
 186
 187   if(last_freq_id != freq_id) {
 188     ioctl(dxr2_fd, DXR2_IOC_SET_AUDIO_SAMPLE_FREQUENCY, &freq_id);
 189     last_freq_id = freq_id;
 190   }
 191
 192   send_mpeg_lpcm_packet (data, len, id, timestamp, freq_id, write_dxr2);
 193 }
 194
 195 // plays 'len' bytes of 'data'
 196 // it should round it down to outburst*n
 197 // return: number of bytes played
 198 static int play(void* data,int len,int flags){
 199   int write_dxr2(const unsigned char *data, int len);
 200
 201   // MPEG and AC3 don't work :-(
 202     if(ao_data.format==AF_FORMAT_MPEG2)
 203       send_mpeg_ps_packet (data, len, 0xC0, ao_data.pts, 2, write_dxr2);
 204     else if(AF_FORMAT_IS_AC3(ao_data.format))
 205       send_mpeg_ps_packet (data, len, 0x80, ao_data.pts, 2, write_dxr2);
 206     else {
 207         int i;
 208         //unsigned short *s=data;
 209         uint16_t *s=data;
 210 #if !HAVE_BIGENDIAN
 211         for(i=0;i<len/2;i++) s[i] = bswap_16(s[i]);
 212 #endif
 213         dxr2_send_lpcm_packet(data,len,0xA0,ao_data.pts-10000,freq_id);
 214     }
 215     return len;
 216 }
 217
 218 // return: delay in seconds between first and last sample in buffer
 219 static float get_delay(void){
 220
 221     return 0.0;
 222 }