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