libmpcodecs/ad_libdv.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <sys/types.h>
   5 #include <unistd.h>
   6 #include <math.h>
   7
   8 #include "config.h"
   9 #include "mp_msg.h"
  10 #include "help_mp.h"
  11
  12 #ifdef HAVE_LIBDV095
  13
  14 #include "img_format.h"
  15
  16 #include <libdv/dv.h>
  17 #include <libdv/dv_types.h>
  18
  19 #include "stream.h"
  20 #include "demuxer.h"
  21 #include "stheader.h"
  22
  23 #include "ad_internal.h"
  24
  25 static ad_info_t info =
  26 {
  27         "Raw DV Audio Decoder",
  28         "libdv",
  29         "Alexander Neundorf <neundorf@kde.org>",
  30         "http://libdv.sf.net",
  31         ""
  32 };
  33
  34 LIBAD_EXTERN(libdv)
  35
  36 // defined in vd_libdv.c:
  37 dv_decoder_t*  init_global_rawdv_decoder();
  38
  39 static int preinit(sh_audio_t *sh_audio)
  40 {
  41   sh_audio->audio_out_minsize=4*DV_AUDIO_MAX_SAMPLES*2;
  42   return 1;
  43 }
  44
  45 static int16_t *audioBuffers[4]={NULL,NULL,NULL,NULL};
  46
  47 static int init(sh_audio_t *sh)
  48 {
  49   int i;
  50   WAVEFORMATEX *h=sh->wf;
  51
  52   if(!h) return 0;
  53
  54   sh->i_bps=h->nAvgBytesPerSec;
  55   sh->channels=h->nChannels;
  56   sh->samplerate=h->nSamplesPerSec;
  57   sh->samplesize=(h->wBitsPerSample+7)/8;
  58
  59   sh->context=init_global_rawdv_decoder();
  60
  61   for (i=0; i < 4; i++)
  62     audioBuffers[i] = malloc(2*DV_AUDIO_MAX_SAMPLES);
  63
  64   return 1;
  65 }
  66
  67 static void uninit(sh_audio_t *sh_audio)
  68 {
  69   int i;
  70   for (i=0; i < 4; i++)
  71     free(audioBuffers[i]);
  72 }
  73
  74 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
  75 {
  76     // TODO!!!
  77   return CONTROL_UNKNOWN;
  78 }
  79
  80 static int decode_audio(sh_audio_t *audio, unsigned char *buf, int minlen, int maxlen)
  81 {
  82    int len=0;
  83    dv_decoder_t* decoder=audio->context;  //global_rawdv_decoder;
  84    unsigned char* dv_audio_frame=NULL;
  85    int xx=ds_get_packet(audio->ds,&dv_audio_frame);
  86    if(xx<=0 || !dv_audio_frame) return 0; // EOF?
  87
  88    dv_parse_header(decoder, dv_audio_frame);
  89
  90    if(xx!=decoder->frame_size)
  91        mp_msg(MSGT_GLOBAL,MSGL_WARN,MSGTR_MPCODECS_AudioFramesizeDiffers,
  92            xx, decoder->frame_size);
  93
  94    if (dv_decode_full_audio(decoder, dv_audio_frame,(int16_t**) audioBuffers))
  95    {
  96       /* Interleave the audio into a single buffer */
  97       int i=0;
  98       int16_t *bufP=(int16_t*)buf;
  99
 100 //      printf("samples=%d/%d  chans=%d  mem=%d  \n",decoder->audio->samples_this_frame,DV_AUDIO_MAX_SAMPLES,
 101 //          decoder->audio->num_channels, decoder->audio->samples_this_frame*decoder->audio->num_channels*2);
 102
 103 //   return (44100/30)*4;
 104
 105       for (i=0; i < decoder->audio->samples_this_frame; i++)
 106       {
 107          int ch;
 108          for (ch=0; ch < decoder->audio->num_channels; ch++)
 109             bufP[len++] = audioBuffers[ch][i];
 110       }
 111    }
 112    return len*2;
 113 }
 114
 115 #endif
 116