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
30 /* max frame size of the 16 bits version is 16384 */
31 /* max frame size of the 14 bits version is 18726 */
36 int out_discrete_channels;
40 static int decdcaInit( hb_work_object_t *, hb_job_t * );
41 static int decdcaWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
42 static void decdcaClose( hb_work_object_t * );
43 static int decdcaBSInfo( hb_work_object_t *, const hb_buffer_t *,
46 hb_work_object_t hb_decdca =
57 /***********************************************************************
59 **********************************************************************/
60 static hb_buffer_t * Decode( hb_work_object_t * w );
62 /***********************************************************************
64 ***********************************************************************
65 * Allocate the work object, initialize libdca
66 **********************************************************************/
67 static int decdcaInit( hb_work_object_t * w, hb_job_t * job )
69 hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
70 hb_audio_t * audio = w->audio;
75 pv->list = hb_list_init();
76 pv->state = dca_init( 0 );
78 /* Decide what format we want out of libdca
79 work.c has already done some of this deduction for us in do_job() */
81 pv->flags_out = HB_AMIXDOWN_GET_DCA_FORMAT(audio->config.out.mixdown);
83 /* pass the number of channels used into the private work data */
84 /* will only be actually used if we're not doing AC3 passthru */
85 pv->out_discrete_channels = HB_AMIXDOWN_GET_DISCRETE_CHANNEL_COUNT(audio->config.out.mixdown);
92 /***********************************************************************
94 ***********************************************************************
96 **********************************************************************/
97 static void decdcaClose( hb_work_object_t * w )
99 hb_work_private_t * pv = w->private_data;
100 dca_free( pv->state );
101 hb_list_empty( &pv->list );
103 w->private_data = NULL;
106 /***********************************************************************
108 ***********************************************************************
109 * Add the given buffer to the data we already have, and decode as much
111 **********************************************************************/
112 static int decdcaWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
113 hb_buffer_t ** buf_out )
115 hb_work_private_t * pv = w->private_data;
118 if ( (*buf_in)->size <= 0 )
120 /* EOF on input stream - send it downstream & say that we're done */
126 if ( (*buf_in)->start < -1 && pv->next_pts == 0 )
128 // discard buffers that start before video time 0
133 hb_list_add( pv->list, *buf_in );
136 /* If we got more than a frame, chain raw buffers */
137 *buf_out = buf = Decode( w );
140 buf->next = Decode( w );
147 /***********************************************************************
149 ***********************************************************************
151 **********************************************************************/
152 static hb_buffer_t * Decode( hb_work_object_t * w )
154 hb_work_private_t * pv = w->private_data;
156 hb_audio_t * audio = w->audio;
161 /* Get a frame header if don't have one yet */
164 while( hb_list_bytes( pv->list ) >= 14 )
166 /* We have 14 bytes, check if this is a correct header */
167 hb_list_seebytes( pv->list, pv->frame, 14 );
168 pv->size = dca_syncinfo( pv->state, pv->frame, &pv->flags_in, &pv->rate,
169 &pv->bitrate, &pv->frame_length );
175 hb_log( "dca_syncinfo ok" );
185 hb_log( "dca_syncinfo failed" );
189 /* Try one byte later */
190 hb_list_getbytes( pv->list, pv->frame, 1, NULL, NULL );
194 if( !pv->sync || hb_list_bytes( pv->list ) < pv->size )
200 /* Get the whole frame */
201 hb_list_getbytes( pv->list, pv->frame, pv->size, &pts, &pos );
202 if ( pts != pv->last_buf_pts )
204 pv->last_buf_pts = pts;
208 // spec says that the PTS is the start time of the first frame
209 // that starts in the PES frame so we only use the PTS once then
210 // get the following frames' PTS from the frame length.
214 // mkv files typically use a 1ms timebase which results in a lot of
215 // truncation error in their timestamps. Also, TSMuxer or something
216 // in the m2ts-to-mkv toolchain seems to take a very casual attitude
217 // about time - timestamps seem to randomly offset by ~40ms for a few
218 // seconds then recover. So, if the pts we got is within 50ms of the
219 // pts computed from the data stream, use the data stream pts.
220 if ( pts == -1 || ( pv->next_pts && fabs( pts - pv->next_pts ) < 50.*90. ) )
225 double frame_dur = (double)(pv->frame_length & ~0xFF) / (double)pv->rate * 90000.;
227 /* DCA passthrough: don't decode the DCA frame */
228 if( audio->config.out.codec == HB_ACODEC_DCA )
230 buf = hb_buffer_init( pv->size );
231 memcpy( buf->data, pv->frame, pv->size );
233 pv->next_pts = pts + frame_dur;
234 buf->stop = pv->next_pts;
240 dca_frame( pv->state, pv->frame, &pv->flags_out, &pv->level, 0 );
242 /* find out how many blocks are in this frame */
243 num_blocks = dca_blocks_num( pv->state );
245 /* num_blocks blocks per frame, 256 samples per block, channelsused channels */
246 int nsamp = num_blocks * 256;
247 buf = hb_buffer_init( nsamp * pv->out_discrete_channels * sizeof( float ) );
250 pv->next_pts = pts + (double)nsamp / (double)pv->rate * 90000.;
251 buf->stop = pv->next_pts;
253 for( i = 0; i < num_blocks; i++ )
255 dca_sample_t * samples_in;
258 dca_block( pv->state );
259 samples_in = dca_samples( pv->state );
260 samples_out = ((float *) buf->data) + 256 * pv->out_discrete_channels * i;
263 for( j = 0; j < 256; j++ )
265 for ( k = 0; k < pv->out_discrete_channels; k++ )
267 samples_out[(pv->out_discrete_channels*j)+k] = samples_in[(256*k)+j] * 16384;
278 static int decdcaBSInfo( hb_work_object_t *w, const hb_buffer_t *b,
279 hb_work_info_t *info )
281 int i, flags, rate, bitrate, frame_length;
282 dca_state_t * state = dca_init( 0 );
284 memset( info, 0, sizeof(*info) );
286 /* since DCA frames don't line up with MPEG ES frames scan the
287 * entire frame for an DCA sync pattern. */
288 for ( i = 0; i < b->size - 7; ++i )
290 if( dca_syncinfo( state, &b->data[i], &flags, &rate, &bitrate,
296 if ( i >= b->size - 7 )
298 /* didn't find DCA sync */
305 info->bitrate = bitrate;
308 if ( ( flags & DCA_CHANNEL_MASK) == DCA_DOLBY )
310 info->flags |= AUDIO_F_DOLBY;
313 switch( flags & DCA_CHANNEL_MASK )
317 info->channel_layout = HB_INPUT_CH_LAYOUT_MONO;
322 case DCA_STEREO_SUMDIFF:
323 case DCA_STEREO_TOTAL:
324 info->channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
328 info->channel_layout = HB_INPUT_CH_LAYOUT_3F2R;
332 info->channel_layout = HB_INPUT_CH_LAYOUT_3F1R;
336 info->channel_layout = HB_INPUT_CH_LAYOUT_3F;
339 info->channel_layout = HB_INPUT_CH_LAYOUT_2F1R;
342 info->channel_layout = HB_INPUT_CH_LAYOUT_2F2R;
345 info->channel_layout = HB_INPUT_CH_LAYOUT_4F2R;
349 info->channel_layout = HB_INPUT_CH_LAYOUT_STEREO;
354 info->channel_layout |= HB_INPUT_CH_LAYOUT_HAS_LFE;