libmpcodecs/ad_libdv.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 <sys/types.h>
  23 #include <unistd.h>
  24 #include <math.h>
  25
  26 #include "config.h"
  27 #include "mp_msg.h"
  28
  29 #include "img_format.h"
  30
  31 #include <libdv/dv.h>
  32 #include <libdv/dv_types.h>
  33
  34 #include "stream/stream.h"
  35 #include "libmpdemux/demuxer.h"
  36 #include "libmpdemux/stheader.h"
  37
  38 #include "ad_internal.h"
  39 #include "vd_libdv.h"
  40
  41 static const ad_info_t info =
  42 {
  43         "Raw DV Audio Decoder",
  44         "libdv",
  45         "Alexander Neundorf <neundorf@kde.org>",
  46         "http://libdv.sf.net",
  47         ""
  48 };
  49
  50 LIBAD_EXTERN(libdv)
  51
  52 static int preinit(sh_audio_t *sh_audio)
  53 {
  54   sh_audio->audio_out_minsize=4*DV_AUDIO_MAX_SAMPLES*2;
  55   return 1;
  56 }
  57
  58 static int16_t *audioBuffers[4]={NULL,NULL,NULL,NULL};
  59
  60 static int init(sh_audio_t *sh)
  61 {
  62   int i;
  63   WAVEFORMATEX *h=sh->wf;
  64
  65   if(!h) return 0;
  66
  67   sh->i_bps=h->nAvgBytesPerSec;
  68   sh->channels=h->nChannels;
  69   sh->samplerate=h->nSamplesPerSec;
  70   sh->samplesize=(h->wBitsPerSample+7)/8;
  71
  72   sh->context=init_global_rawdv_decoder();
  73
  74   for (i=0; i < 4; i++)
  75     audioBuffers[i] = malloc(2*DV_AUDIO_MAX_SAMPLES);
  76
  77   return 1;
  78 }
  79
  80 static void uninit(sh_audio_t *sh_audio)
  81 {
  82   int i;
  83   for (i=0; i < 4; i++)
  84     free(audioBuffers[i]);
  85 }
  86
  87 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
  88 {
  89     // TODO!!!
  90   return CONTROL_UNKNOWN;
  91 }
  92
  93 static int decode_audio(sh_audio_t *audio, unsigned char *buf, int minlen, int maxlen)
  94 {
  95    int len=0;
  96    dv_decoder_t* decoder=audio->context;  //global_rawdv_decoder;
  97    unsigned char* dv_audio_frame=NULL;
  98    int xx=ds_get_packet(audio->ds,&dv_audio_frame);
  99    if(xx<=0 || !dv_audio_frame) return 0; // EOF?
 100
 101    dv_parse_header(decoder, dv_audio_frame);
 102
 103    if(xx!=decoder->frame_size)
 104        mp_tmsg(MSGT_GLOBAL,MSGL_WARN,"[AD_LIBDV] Warning! Audio framesize differs! read=%d  hdr=%d.\n",
 105            xx, decoder->frame_size);
 106
 107    if (dv_decode_full_audio(decoder, dv_audio_frame,(int16_t**) audioBuffers))
 108    {
 109       /* Interleave the audio into a single buffer */
 110       int i=0;
 111       int16_t *bufP=(int16_t*)buf;
 112
 113 //      printf("samples=%d/%d  chans=%d  mem=%d  \n",decoder->audio->samples_this_frame,DV_AUDIO_MAX_SAMPLES,
 114 //          decoder->audio->num_channels, decoder->audio->samples_this_frame*decoder->audio->num_channels*2);
 115
 116 //   return (44100/30)*4;
 117
 118       for (i=0; i < decoder->audio->samples_this_frame; i++)
 119       {
 120          int ch;
 121          for (ch=0; ch < decoder->audio->num_channels; ch++)
 122             bufP[len++] = audioBuffers[ch][i];
 123       }
 124    }
 125    return len*2;
 126 }