1 /* $Id: deca52.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. */
9 #include "a52dec/a52.h"
11 struct hb_work_private_s
28 int64_t next_expected_pts;
34 int out_discrete_channels;
38 int deca52Init( hb_work_object_t *, hb_job_t * );
39 int deca52Work( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
40 void deca52Close( hb_work_object_t * );
42 hb_work_object_t hb_deca52 =
51 /***********************************************************************
53 **********************************************************************/
54 static hb_buffer_t * Decode( hb_work_object_t * w );
56 /***********************************************************************
58 ***********************************************************************
59 * Allocate the work object, initialize liba52
60 **********************************************************************/
61 int deca52Init( 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 = a52_init( 0 );
71 /* Decide what format we want out of a52dec
72 work.c has already done some of this deduction for us in do_job() */
74 pv->flags_out = HB_AMIXDOWN_GET_A52_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);
81 pv->next_expected_pts = 0;
86 /***********************************************************************
88 ***********************************************************************
90 **********************************************************************/
91 void deca52Close( hb_work_object_t * w )
93 hb_work_private_t * pv = w->private_data;
94 a52_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 deca52Work( 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;
138 /* Get a frame header if don't have one yet */
141 while( hb_list_bytes( pv->list ) >= 7 )
143 /* We have 7 bytes, check if this is a correct header */
144 hb_list_seebytes( pv->list, pv->frame, 7 );
145 pv->size = a52_syncinfo( pv->frame, &pv->flags_in, &pv->rate,
152 hb_log( "a52_syncinfo ok" );
162 hb_log( "a52_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 );
181 /* AC3 passthrough: don't decode the AC3 frame */
182 if( pv->job->acodec & HB_ACODEC_AC3 )
184 buf = hb_buffer_init( pv->size );
185 memcpy( buf->data, pv->frame, pv->size );
186 buf->start = pts + ( pos / pv->size ) * 6 * 256 * 90000 / pv->rate;
187 buf->stop = buf->start + 6 * 256 * 90000 / pv->rate;
193 a52_frame( pv->state, pv->frame, &pv->flags_out, &pv->level, 0 );
195 /* 6 blocks per frame, 256 samples per block, channelsused channels */
196 buf = hb_buffer_init( 6 * 256 * pv->out_discrete_channels * sizeof( float ) );
199 pts = pv->next_expected_pts;
201 buf->start = pts + ( pos / pv->size ) * 6 * 256 * 90000 / pv->rate;
202 buf->stop = buf->start + 6 * 256 * 90000 / pv->rate;
205 * To track AC3 PTS add this back in again.
206 *hb_log("AC3: pts is %lld, buf->start %lld buf->stop %lld", pts, buf->start, buf->stop);
209 pv->next_expected_pts = buf->stop;
211 for( i = 0; i < 6; i++ )
213 sample_t * samples_in;
216 a52_block( pv->state );
217 samples_in = a52_samples( pv->state );
218 samples_out = ((float *) buf->data) + 256 * pv->out_discrete_channels * i;
221 for( j = 0; j < 256; j++ )
223 for ( k = 0; k < pv->out_discrete_channels; k++ )
225 samples_out[(pv->out_discrete_channels*j)+k] = samples_in[(256*k)+j];