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