1 /* $Id: decdca.c,v 1.14 2005/03/03 17:21:57 titer Exp $
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. */
10 struct hb_work_private_s
28 /* max frame size of the 16 bits version is 16384 */
29 /* max frame size of the 14 bits version is 18726 */
34 int out_discrete_channels;
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 * );
42 hb_work_object_t hb_decdca =
51 /***********************************************************************
53 **********************************************************************/
54 static hb_buffer_t * Decode( hb_work_object_t * w );
56 /***********************************************************************
58 ***********************************************************************
59 * Allocate the work object, initialize libdca
60 **********************************************************************/
61 int decdcaInit( hb_work_object_t * w, hb_job_t * job )
63 hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
68 pv->list = hb_list_init();
69 pv->state = dca_init( 0 );
71 /* Decide what format we want out of libdca
72 work.c has already done some of this deduction for us in do_job() */
74 pv->flags_out = HB_AMIXDOWN_GET_DCA_FORMAT(w->amixdown);
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);
85 /***********************************************************************
87 ***********************************************************************
89 **********************************************************************/
90 void decdcaClose( hb_work_object_t * w )
92 hb_work_private_t * pv = w->private_data;
93 dca_free( pv->state );
94 hb_list_empty( &pv->list );
96 w->private_data = NULL;
99 /***********************************************************************
101 ***********************************************************************
102 * Add the given buffer to the data we already have, and decode as much
104 **********************************************************************/
105 int decdcaWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
106 hb_buffer_t ** buf_out )
108 hb_work_private_t * pv = w->private_data;
111 hb_list_add( pv->list, *buf_in );
114 /* If we got more than a frame, chain raw buffers */
115 *buf_out = buf = Decode( w );
118 buf->next = Decode( w );
125 /***********************************************************************
127 ***********************************************************************
129 **********************************************************************/
130 static hb_buffer_t * Decode( hb_work_object_t * w )
132 hb_work_private_t * pv = w->private_data;
138 /* Get a frame header if don't have one yet */
141 while( hb_list_bytes( pv->list ) >= 14 )
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 );
152 hb_log( "dca_syncinfo ok" );
162 hb_log( "dca_syncinfo failed" );
166 /* Try one byte later */
167 hb_list_getbytes( pv->list, pv->frame, 1, NULL, NULL );
172 hb_list_bytes( pv->list ) < pv->size )
178 /* Get the whole frame */
179 hb_list_getbytes( pv->list, pv->frame, pv->size, &pts, &pos );
182 dca_frame( pv->state, pv->frame, &pv->flags_out, &pv->level, 0 );
184 /* find out how many blocks are in this frame */
185 num_blocks = dca_blocks_num( pv->state );
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;
192 for( i = 0; i < num_blocks; i++ )
194 dca_sample_t * samples_in;
197 dca_block( pv->state );
198 samples_in = dca_samples( pv->state );
199 samples_out = ((float *) buf->data) + 256 * pv->out_discrete_channels * i;
202 for( j = 0; j < 256; j++ )
204 for ( k = 0; k < pv->out_discrete_channels; k++ )
206 samples_out[(pv->out_discrete_channels*j)+k] = samples_in[(256*k)+j] * 16384;