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.fr/>.
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 ) );
64 hb_audio_t * audio = w->audio;
69 pv->list = hb_list_init();
70 pv->state = dca_init( 0 );
72 /* Decide what format we want out of libdca
73 work.c has already done some of this deduction for us in do_job() */
75 pv->flags_out = HB_AMIXDOWN_GET_DCA_FORMAT(audio->config.out.mixdown);
77 /* pass the number of channels used into the private work data */
78 /* will only be actually used if we're not doing AC3 passthru */
79 pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown);
86 /***********************************************************************
88 ***********************************************************************
90 **********************************************************************/
91 void decdcaClose( hb_work_object_t * w )
93 hb_work_private_t * pv = w->private_data;
94 dca_free( pv->state );
95 hb_list_empty( &pv->list );
97 w->private_data = NULL;
100 /***********************************************************************
102 ***********************************************************************
103 * Add the given buffer to the data we already have, and decode as much
105 **********************************************************************/
106 int decdcaWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
107 hb_buffer_t ** buf_out )
109 hb_work_private_t * pv = w->private_data;
112 hb_list_add( pv->list, *buf_in );
115 /* If we got more than a frame, chain raw buffers */
116 *buf_out = buf = Decode( w );
119 buf->next = Decode( w );
126 /***********************************************************************
128 ***********************************************************************
130 **********************************************************************/
131 static hb_buffer_t * Decode( hb_work_object_t * w )
133 hb_work_private_t * pv = w->private_data;
139 /* Get a frame header if don't have one yet */
142 while( hb_list_bytes( pv->list ) >= 14 )
144 /* We have 14 bytes, check if this is a correct header */
145 hb_list_seebytes( pv->list, pv->frame, 14 );
146 pv->size = dca_syncinfo( pv->state, pv->frame, &pv->flags_in, &pv->rate,
147 &pv->bitrate, &pv->frame_length );
153 hb_log( "dca_syncinfo ok" );
163 hb_log( "dca_syncinfo failed" );
167 /* Try one byte later */
168 hb_list_getbytes( pv->list, pv->frame, 1, NULL, NULL );
173 hb_list_bytes( pv->list ) < pv->size )
179 /* Get the whole frame */
180 hb_list_getbytes( pv->list, pv->frame, pv->size, &pts, &pos );
183 dca_frame( pv->state, pv->frame, &pv->flags_out, &pv->level, 0 );
185 /* find out how many blocks are in this frame */
186 num_blocks = dca_blocks_num( pv->state );
188 /* num_blocks blocks per frame, 256 samples per block, channelsused channels */
189 buf = hb_buffer_init( num_blocks * 256 * pv->out_discrete_channels * sizeof( float ) );
190 buf->start = pts + ( pos / pv->size ) * num_blocks * 256 * 90000 / pv->rate;
191 buf->stop = buf->start + num_blocks * 256 * 90000 / pv->rate;
193 for( i = 0; i < num_blocks; i++ )
195 dca_sample_t * samples_in;
198 dca_block( pv->state );
199 samples_in = dca_samples( pv->state );
200 samples_out = ((float *) buf->data) + 256 * pv->out_discrete_channels * i;
203 for( j = 0; j < 256; j++ )
205 for ( k = 0; k < pv->out_discrete_channels; k++ )
207 samples_out[(pv->out_discrete_channels*j)+k] = samples_in[(256*k)+j] * 16384;