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 #include "help_mp.h"
  29
  30 #include "img_format.h"
  31
  32 #include <libdv/dv.h>
  33 #include <libdv/dv_types.h>
  34
  35 #include "stream/stream.h"
  36 #include "libmpdemux/demuxer.h"
  37 #include "libmpdemux/stheader.h"
  38
  39 #include "ad_internal.h"
  40 #include "vd_libdv.h"
  41
  42 static const ad_info_t info =
  43 {
  44         "Raw DV Audio Decoder",
  45         "libdv",
  46         "Alexander Neundorf <neundorf@kde.org>",
  47         "http://libdv.sf.net",
  48         ""
  49 };
  50
  51 LIBAD_EXTERN(libdv)
  52
  53 static int preinit(sh_audio_t *sh_audio)
  54 {
  55   sh_audio->audio_out_minsize=4*DV_AUDIO_MAX_SAMPLES*2;
  56   return 1;
  57 }
  58
  59 static int16_t *audioBuffers[4]={NULL,NULL,NULL,NULL};
  60
  61 static int init(sh_audio_t *sh)
  62 {
  63   int i;
  64   WAVEFORMATEX *h=sh->wf;
  65
  66   if(!h) return 0;
  67
  68   sh->i_bps=h->nAvgBytesPerSec;
  69   sh->channels=h->nChannels;
  70   sh->samplerate=h->nSamplesPerSec;
  71   sh->samplesize=(h->wBitsPerSample+7)/8;
  72
  73   sh->context=init_global_rawdv_decoder();
  74
  75   for (i=0; i < 4; i++)
  76     audioBuffers[i] = malloc(2*DV_AUDIO_MAX_SAMPLES);
  77
  78   return 1;
  79 }
  80
  81 static void uninit(sh_audio_t *sh_audio)
  82 {
  83   int i;
  84   for (i=0; i < 4; i++)
  85     free(audioBuffers[i]);
  86 }
  87
  88 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
  89 {
  90     // TODO!!!
  91   return CONTROL_UNKNOWN;
  92 }
  93
  94 static int decode_audio(sh_audio_t *audio, unsigned char *buf, int minlen, int maxlen)
  95 {
  96    int len=0;
  97    dv_decoder_t* decoder=audio->context;  //global_rawdv_decoder;
  98    unsigned char* dv_audio_frame=NULL;
  99    int xx=ds_get_packet(audio->ds,&dv_audio_frame);
 100    if(xx<=0 || !dv_audio_frame) return 0; // EOF?
 101
 102    dv_parse_header(decoder, dv_audio_frame);
 103
 104    if(xx!=decoder->frame_size)
 105        mp_msg(MSGT_GLOBAL,MSGL_WARN,MSGTR_MPCODECS_AudioFramesizeDiffers,
 106            xx, decoder->frame_size);
 107
 108    if (dv_decode_full_audio(decoder, dv_audio_frame,(int16_t**) audioBuffers))
 109    {
 110       /* Interleave the audio into a single buffer */
 111       int i=0;
 112       int16_t *bufP=(int16_t*)buf;
 113
 114 //      printf("samples=%d/%d  chans=%d  mem=%d  \n",decoder->audio->samples_this_frame,DV_AUDIO_MAX_SAMPLES,
 115 //          decoder->audio->num_channels, decoder->audio->samples_this_frame*decoder->audio->num_channels*2);
 116
 117 //   return (44100/30)*4;
 118
 119       for (i=0; i < decoder->audio->samples_this_frame; i++)
 120       {
 121          int ch;
 122          for (ch=0; ch < decoder->audio->num_channels; ch++)
 123             bufP[len++] = audioBuffers[ch][i];
 124       }
 125    }
 126    return len*2;
 127 }