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;
36 int out_discrete_channels;
40 int deca52Init( hb_work_object_t *, hb_job_t * );
41 int deca52Work( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
42 void deca52Close( hb_work_object_t * );
44 hb_work_object_t hb_deca52 =
53 /***********************************************************************
55 **********************************************************************/
56 static hb_buffer_t * Decode( hb_work_object_t * w );
58 /***********************************************************************
60 ***********************************************************************
61 * Allocate the work object, initialize liba52
62 **********************************************************************/
63 int deca52Init( hb_work_object_t * w, hb_job_t * job )
65 hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
70 pv->list = hb_list_init();
71 pv->state = a52_init( 0 );
73 /* Decide what format we want out of a52dec
74 work.c has already done some of this deduction for us in do_job() */
76 pv->flags_out = HB_AMIXDOWN_GET_A52_FORMAT(w->amixdown);
78 /* pass the number of channels used into the private work data */
79 /* will only be actually used if we're not doing AC3 passthru */
80 pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(w->amixdown);
83 pv->next_expected_pts = 0;
89 /***********************************************************************
91 ***********************************************************************
93 **********************************************************************/
94 void deca52Close( hb_work_object_t * w )
96 hb_work_private_t * pv = w->private_data;
97 a52_free( pv->state );
98 hb_list_empty( &pv->list );
100 w->private_data = NULL;
103 /***********************************************************************
105 ***********************************************************************
106 * Add the given buffer to the data we already have, and decode as much
108 **********************************************************************/
109 int deca52Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
110 hb_buffer_t ** buf_out )
112 hb_work_private_t * pv = w->private_data;
115 if( buf_in && *buf_in )
117 pv->sequence = (*buf_in)->sequence;
120 hb_list_add( pv->list, *buf_in );
123 /* If we got more than a frame, chain raw buffers */
124 *buf_out = buf = Decode( w );
127 buf->sequence = pv->sequence;
128 buf->next = Decode( w );
135 /***********************************************************************
137 ***********************************************************************
139 **********************************************************************/
140 static hb_buffer_t * Decode( hb_work_object_t * w )
142 hb_work_private_t * pv = w->private_data;
147 /* Get a frame header if don't have one yet */
150 while( hb_list_bytes( pv->list ) >= 7 )
152 /* We have 7 bytes, check if this is a correct header */
153 hb_list_seebytes( pv->list, pv->frame, 7 );
154 pv->size = a52_syncinfo( pv->frame, &pv->flags_in, &pv->rate,
161 hb_log( "a52_syncinfo ok" );
171 hb_log( "a52_syncinfo failed" );
175 /* Try one byte later */
176 hb_list_getbytes( pv->list, pv->frame, 1, NULL, NULL );
181 hb_list_bytes( pv->list ) < pv->size )
187 /* Get the whole frame */
188 hb_list_getbytes( pv->list, pv->frame, pv->size, &pts, &pos );
190 /* AC3 passthrough: don't decode the AC3 frame */
191 if( pv->job->acodec & HB_ACODEC_AC3 )
193 buf = hb_buffer_init( pv->size );
194 memcpy( buf->data, pv->frame, pv->size );
195 buf->start = pts + ( pos / pv->size ) * 6 * 256 * 90000 / pv->rate;
196 buf->stop = buf->start + 6 * 256 * 90000 / pv->rate;
202 a52_frame( pv->state, pv->frame, &pv->flags_out, &pv->level, 0 );
204 /* 6 blocks per frame, 256 samples per block, channelsused channels */
205 buf = hb_buffer_init( 6 * 256 * pv->out_discrete_channels * sizeof( float ) );
208 pts = pv->next_expected_pts;
210 buf->start = pts + ( pos / pv->size ) * 6 * 256 * 90000 / pv->rate;
211 buf->stop = buf->start + 6 * 256 * 90000 / pv->rate;
214 * To track AC3 PTS add this back in again.
215 *hb_log("AC3: pts is %lld, buf->start %lld buf->stop %lld", pts, buf->start, buf->stop);
218 pv->next_expected_pts = buf->stop;
220 for( i = 0; i < 6; i++ )
222 sample_t * samples_in;
225 a52_block( pv->state );
226 samples_in = a52_samples( pv->state );
227 samples_out = ((float *) buf->data) + 256 * pv->out_discrete_channels * i;
230 for( j = 0; j < 256; j++ )
232 for ( k = 0; k < pv->out_discrete_channels; k++ )
234 samples_out[(pv->out_discrete_channels*j)+k] = samples_in[(256*k)+j];