libmpcodecs/ad_hwmpa.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23
  24 #include "config.h"
  25
  26 #include "mp_msg.h"
  27
  28 #include "libaf/af_format.h"
  29 #include "ad_internal.h"
  30
  31 #include "libmpdemux/mp3_hdr.h"
  32
  33 //based on ad_hwac3.c and ad_libmad.c
  34
  35 static const ad_info_t info =
  36 {
  37         "MPEG audio pass-through (fake decoder)",
  38         "hwmpa",
  39         "NicoDVB",
  40         "NicoDVB",
  41         "For hardware decoders"
  42 };
  43
  44 LIBAD_EXTERN(hwmpa)
  45
  46 static int mpa_sync(sh_audio_t *sh, int no_frames, int *n, int *chans, int *srate, int *spf, int *mpa_layer, int *br)
  47 {
  48         int cnt = 0, x = 0, len, frames_count;
  49
  50         frames_count = 0;
  51         do
  52         {
  53                 while(cnt + 4 < sh->a_in_buffer_len)
  54                 {
  55                         x = mp_get_mp3_header(&(sh->a_in_buffer[cnt]), chans, srate, spf, mpa_layer, br);
  56                         if(x > 0)
  57                         {
  58                                 frames_count++;
  59                                 if(frames_count == no_frames)
  60                                 {
  61                                         *n = x;
  62                                         return cnt;
  63                                 }
  64                         }
  65                         cnt++;
  66                 }
  67                 len = demux_read_data(sh->ds,&sh->a_in_buffer[sh->a_in_buffer_len],sh->a_in_buffer_size-sh->a_in_buffer_len);
  68                 if(len > 0)
  69                         sh->a_in_buffer_len += len;
  70         } while(len > 0);
  71         mp_msg(MSGT_DECAUDIO,MSGL_INFO,"Cannot sync MPA frame: %d\r\n", len);
  72         return -1;
  73 }
  74
  75 static int preinit(sh_audio_t *sh)
  76 {
  77         sh->audio_out_minsize = 4608;//check
  78         sh->audio_in_minsize = 4608;//check
  79         sh->sample_format = AF_FORMAT_MPEG2;
  80         return 1;
  81 }
  82
  83 static int init(sh_audio_t *sh)
  84 {
  85         int cnt, chans, srate, spf, mpa_layer, br, len;
  86
  87         if((cnt = mpa_sync(sh, 1, &len, &chans, &srate, &spf, &mpa_layer, &br)) < 0)
  88                 return 0;
  89
  90         sh->channels = chans;
  91         sh->samplerate = srate;
  92         sh->i_bps = br * 125;
  93         sh->samplesize = 2;
  94
  95         mp_msg(MSGT_DECAUDIO,MSGL_V,"AC_HWMPA initialized, bitrate: %d kb/s\r\n", len);
  96         return 1;
  97 }
  98
  99 static int decode_audio(sh_audio_t *sh,unsigned char *buf,int minlen,int maxlen)
 100 {
 101         int len, start, tot;
 102         int chans, srate, spf, mpa_layer, br;
 103         int tot2;
 104
 105         tot = tot2 = 0;
 106
 107         while(tot2 < maxlen)
 108         {
 109                 start = mpa_sync(sh, 1, &len, &chans, &srate, &spf, &mpa_layer, &br);
 110                 if(start < 0 || tot2 + spf * 2 * chans > maxlen)
 111                         break;
 112
 113                 if(start + len > sh->a_in_buffer_len)
 114                 {
 115                         int l;
 116                         l = FFMIN(sh->a_in_buffer_size - sh->a_in_buffer_len, start + len);
 117                         l = demux_read_data(sh->ds,&sh->a_in_buffer[sh->a_in_buffer_len], l);
 118                         if(! l)
 119                                 break;
 120                         sh->a_in_buffer_len += l;
 121                         continue;
 122                 }
 123
 124                 memcpy(&buf[tot], &(sh->a_in_buffer[start]), len);
 125                 tot += len;
 126
 127                 sh->a_in_buffer_len -= start + len;
 128                 memmove(sh->a_in_buffer, &(sh->a_in_buffer[start + len]), sh->a_in_buffer_len);
 129                 tot2 += spf * 2 * chans;
 130
 131                 /* HACK: seems to fix most A/V sync issues */
 132                 break;
 133         }
 134
 135         memset(&buf[tot], 0, tot2-tot);
 136         return tot2;
 137 }
 138
 139
 140 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 141 {
 142         int start, len;
 143
 144         switch(cmd)
 145         {
 146                 case ADCTRL_RESYNC_STREAM:
 147                         if(mpa_sync(sh, 1, &len, NULL, NULL, NULL, NULL, NULL) >= 0)
 148                                 return CONTROL_TRUE;
 149                         else
 150                                 return CONTROL_FALSE;
 151                 case ADCTRL_SKIP_FRAME:
 152                         start = mpa_sync(sh, 2, &len, NULL, NULL, NULL, NULL, NULL);
 153                         if(start < 0)
 154                                 return CONTROL_FALSE;
 155
 156                         sh->a_in_buffer_len -= start;
 157                         memmove(sh->a_in_buffer, &(sh->a_in_buffer[start]), sh->a_in_buffer_len);
 158                         return CONTROL_TRUE;
 159         }
 160         return CONTROL_UNKNOWN;
 161 }
 162
 163
 164 static void uninit(sh_audio_t *sh)
 165 {
 166 }