native DV audio/video decoders using libdv

based on patch by Alexander Neundorf <neundorf@kde.org>


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6928 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 115 insertions, 0 deletions

diff --git a/libmpcodecs/ad_libdv.c b/libmpcodecs/ad_libdv.c
new file mode 100644
index 0000000000..0cd5553f8b
--- /dev/null
+++ b/libmpcodecs/ad_libdv.c
@@ -0,0 +1,115 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <math.h>
+
+#include "config.h"
+
+#ifdef HAVE_LIBDV095
+
+#include "img_format.h"
+
+#include <libdv/dv.h>
+#include <libdv/dv_types.h>
+
+#include "stream.h"
+#include "demuxer.h"
+#include "stheader.h"
+
+#include "ad_internal.h"
+
+static ad_info_t info =
+{
+	"Raw DV Audio Decoder",
+	"libdv",
+	AFM_LIBDV,
+	"Alexander Neundorf <neundorf@kde.org>",
+	"http://libdv.sf.net",
+	""
+};
+
+LIBAD_EXTERN(libdv)
+
+// defined in vd_libdv.c:
+dv_decoder_t*  init_global_rawdv_decoder();
+
+static int preinit(sh_audio_t *sh_audio)
+{
+  sh_audio->audio_out_minsize=4*DV_AUDIO_MAX_SAMPLES*2;
+  return 1;
+}
+
+static int16_t *audioBuffers[4]={NULL,NULL,NULL,NULL};
+
+static int init(sh_audio_t *sh)
+{
+  int i;
+  WAVEFORMATEX *h=sh->wf;
+
+  if(!h) return 0;
+   
+  sh->i_bps=h->nAvgBytesPerSec;
+  sh->channels=h->nChannels;
+  sh->samplerate=h->nSamplesPerSec;
+  sh->samplesize=(h->wBitsPerSample+7)/8;
+
+  sh->context=init_global_rawdv_decoder();
+
+  for (i=0; i < 4; i++)
+    audioBuffers[i] = malloc(2*DV_AUDIO_MAX_SAMPLES);
+
+  return 1;
+}
+
+static void uninit(sh_audio_t *sh_audio)
+{
+  int i;
+  for (i=0; i < 4; i++)
+    free(audioBuffers[i]);
+}
+
+static int control(sh_audio_t *sh,int cmd,void* arg, ...)
+{
+    // TODO!!!
+  return CONTROL_UNKNOWN;
+}
+
+static int decode_audio(sh_audio_t *audio, unsigned char *buf, int minlen, int maxlen)
+{
+   int len=0;
+   dv_decoder_t* decoder=audio->context;  //global_rawdv_decoder;
+   unsigned char* dv_audio_frame=NULL;
+   int xx=ds_get_packet(audio->ds,&dv_audio_frame);
+   if(xx<=0 || !dv_audio_frame) return 0; // EOF?
+
+   dv_parse_header(decoder, dv_audio_frame);
+   
+   if(xx!=decoder->frame_size)
+       printf("warning! audio framesize differs! read=%d  hdr=%d  \n",
+           xx, decoder->frame_size);
+
+   if (dv_decode_full_audio(decoder, dv_audio_frame,(int16_t**) audioBuffers))
+   {
+      /* Interleave the audio into a single buffer */
+      int i=0;
+      int16_t *bufP=(int16_t*)buf;
+      
+//      printf("samples=%d/%d  chans=%d  mem=%d  \n",decoder->audio->samples_this_frame,DV_AUDIO_MAX_SAMPLES,
+//          decoder->audio->num_channels, decoder->audio->samples_this_frame*decoder->audio->num_channels*2);
+
+//   return (44100/30)*4;
+
+      for (i=0; i < decoder->audio->samples_this_frame; i++)
+      {
+         int ch;
+         for (ch=0; ch < decoder->audio->num_channels; ch++)
+            bufP[len++] = audioBuffers[ch][i];
+      }
+   }
+   return len*2;
+}
+
+#endif
+