libhb/decdca.c

   1 /* $Id: decdca.c,v 1.14 2005/03/03 17:21:57 titer Exp $
   2
   3    This file is part of the HandBrake source code.
   4    Homepage: <http://handbrake.m0k.org/>.
   5    It may be used under the terms of the GNU General Public License. */
   6
   7 #include "hb.h"
   8 #include "dca.h"
   9
  10 struct hb_work_private_s
  11 {
  12     hb_job_t    * job;
  13
  14     /* libdca handle */
  15     dca_state_t * state;
  16
  17     int           flags_in;
  18     int           flags_out;
  19     int           rate;
  20     int           bitrate;
  21     int           frame_length;
  22     float         level;
  23
  24     int           error;
  25     int           sync;
  26     int           size;
  27
  28     /* max frame size of the 16 bits version is 16384 */
  29     /* max frame size of the 14 bits version is 18726 */
  30     uint8_t       frame[18726];
  31
  32     hb_list_t   * list;
  33
  34         int           out_discrete_channels;
  35
  36 };
  37
  38 int  decdcaInit( hb_work_object_t *, hb_job_t * );
  39 int  decdcaWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
  40 void decdcaClose( hb_work_object_t * );
  41
  42 hb_work_object_t hb_decdca =
  43 {
  44     WORK_DECDCA,
  45     "DCA decoder",
  46     decdcaInit,
  47     decdcaWork,
  48     decdcaClose
  49 };
  50
  51 /***********************************************************************
  52  * Local prototypes
  53  **********************************************************************/
  54 static hb_buffer_t * Decode( hb_work_object_t * w );
  55
  56 /***********************************************************************
  57  * hb_work_decdca_init
  58  ***********************************************************************
  59  * Allocate the work object, initialize libdca
  60  **********************************************************************/
  61 int decdcaInit( hb_work_object_t * w, hb_job_t * job )
  62 {
  63     hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
  64     w->private_data = pv;
  65
  66     pv->job   = job;
  67
  68     pv->list      = hb_list_init();
  69     pv->state     = dca_init( 0 );
  70
  71         /* Decide what format we want out of libdca
  72         work.c has already done some of this deduction for us in do_job() */
  73
  74         pv->flags_out = HB_AMIXDOWN_GET_DCA_FORMAT(w->amixdown);
  75
  76         /* pass the number of channels used into the private work data */
  77         /* will only be actually used if we're not doing AC3 passthru */
  78         pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(w->amixdown);
  79
  80     pv->level     = 32768.0;
  81
  82     return 0;
  83 }
  84
  85 /***********************************************************************
  86  * Close
  87  ***********************************************************************
  88  * Free memory
  89  **********************************************************************/
  90 void decdcaClose( hb_work_object_t * w )
  91 {
  92     hb_work_private_t * pv = w->private_data;
  93     dca_free( pv->state );
  94     hb_list_empty( &pv->list );
  95     free( pv );
  96     w->private_data = NULL;
  97 }
  98
  99 /***********************************************************************
 100  * Work
 101  ***********************************************************************
 102  * Add the given buffer to the data we already have, and decode as much
 103  * as we can
 104  **********************************************************************/
 105 int decdcaWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
 106                 hb_buffer_t ** buf_out )
 107 {
 108     hb_work_private_t * pv = w->private_data;
 109     hb_buffer_t * buf;
 110
 111     hb_list_add( pv->list, *buf_in );
 112     *buf_in = NULL;
 113
 114     /* If we got more than a frame, chain raw buffers */
 115     *buf_out = buf = Decode( w );
 116     while( buf )
 117     {
 118         buf->next = Decode( w );
 119         buf       = buf->next;
 120     }
 121
 122     return HB_WORK_OK;
 123 }
 124
 125 /***********************************************************************
 126  * Decode
 127  ***********************************************************************
 128  *
 129  **********************************************************************/
 130 static hb_buffer_t * Decode( hb_work_object_t * w )
 131 {
 132     hb_work_private_t * pv = w->private_data;
 133     hb_buffer_t * buf;
 134     int           i, j, k;
 135     uint64_t      pts, pos;
 136     int           num_blocks;
 137
 138     /* Get a frame header if don't have one yet */
 139     if( !pv->sync )
 140     {
 141         while( hb_list_bytes( pv->list ) >= 14 )
 142         {
 143             /* We have 14 bytes, check if this is a correct header */
 144             hb_list_seebytes( pv->list, pv->frame, 14 );
 145             pv->size = dca_syncinfo( pv->state, pv->frame, &pv->flags_in, &pv->rate,
 146                                     &pv->bitrate, &pv->frame_length );
 147             if( pv->size )
 148             {
 149                 /* It is. W00t. */
 150                 if( pv->error )
 151                 {
 152                     hb_log( "dca_syncinfo ok" );
 153                 }
 154                 pv->error = 0;
 155                 pv->sync  = 1;
 156                 break;
 157             }
 158
 159             /* It is not */
 160             if( !pv->error )
 161             {
 162                 hb_log( "dca_syncinfo failed" );
 163                 pv->error = 1;
 164             }
 165
 166             /* Try one byte later */
 167             hb_list_getbytes( pv->list, pv->frame, 1, NULL, NULL );
 168         }
 169     }
 170
 171     if( !pv->sync ||
 172         hb_list_bytes( pv->list ) < pv->size )
 173     {
 174         /* Need more data */
 175         return NULL;
 176     }
 177
 178     /* Get the whole frame */
 179     hb_list_getbytes( pv->list, pv->frame, pv->size, &pts, &pos );
 180
 181     /* Feed libdca */
 182     dca_frame( pv->state, pv->frame, &pv->flags_out, &pv->level, 0 );
 183
 184     /* find out how many blocks are in this frame */
 185     num_blocks = dca_blocks_num( pv->state );
 186
 187     /* num_blocks blocks per frame, 256 samples per block, channelsused channels */
 188     buf        = hb_buffer_init( num_blocks * 256 * pv->out_discrete_channels * sizeof( float ) );
 189     buf->start = pts + ( pos / pv->size ) * num_blocks * 256 * 90000 / pv->rate;
 190     buf->stop  = buf->start + num_blocks * 256 * 90000 / pv->rate;
 191
 192     for( i = 0; i < num_blocks; i++ )
 193     {
 194         dca_sample_t * samples_in;
 195         float    * samples_out;
 196
 197         dca_block( pv->state );
 198         samples_in  = dca_samples( pv->state );
 199         samples_out = ((float *) buf->data) + 256 * pv->out_discrete_channels * i;
 200
 201         /* Interleave */
 202         for( j = 0; j < 256; j++ )
 203         {
 204                         for ( k = 0; k < pv->out_discrete_channels; k++ )
 205                         {
 206                                 samples_out[(pv->out_discrete_channels*j)+k]   = samples_in[(256*k)+j] * 16384;
 207                         }
 208         }
 209
 210     }
 211
 212     pv->sync = 0;
 213     return buf;
 214 }
 215