1 /*****************************************************************************
2 * aes3.c: aes3 decoder/packetizer module
3 *****************************************************************************
4 * Copyright (C) 2008 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@videolan.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
33 #include <vlc_codec.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int OpenDecoder ( vlc_object_t * );
40 static int OpenPacketizer( vlc_object_t * );
41 static void Close ( vlc_object_t * );
45 set_category( CAT_INPUT )
46 set_subcategory( SUBCAT_INPUT_ACODEC )
47 set_description( N_("AES3/SMPTE 302M audio decoder") )
48 set_capability( "decoder", 100 )
49 set_callbacks( OpenDecoder, Close )
52 set_description( N_("AES3/SMPTE 302M audio packetizer") )
53 set_capability( "packetizer", 100 )
54 set_callbacks( OpenPacketizer, Close )
58 /*****************************************************************************
59 * decoder_sys_t : aes3 decoder descriptor
60 *****************************************************************************/
69 #define AES3_HEADER_LEN 4
71 /*****************************************************************************
73 *****************************************************************************/
74 static int Open( decoder_t *p_dec, bool b_packetizer );
76 static block_t *Parse( decoder_t *p_dec, int *pi_frame_length, int *pi_bits,
77 block_t **pp_block, bool b_packetizer );
79 static inline uint8_t Reverse8( int n )
81 n = ((n >> 1) & 0x55) | ((n << 1) & 0xaa);
82 n = ((n >> 2) & 0x33) | ((n << 2) & 0xcc);
83 n = ((n >> 4) & 0x0f) | ((n << 4) & 0xf0);
87 /*****************************************************************************
89 *****************************************************************************/
90 static int OpenDecoder( vlc_object_t *p_this )
92 decoder_t *p_dec = (decoder_t*)p_this;
94 return Open( p_dec, false );
97 /*****************************************************************************
99 *****************************************************************************/
100 static int OpenPacketizer( vlc_object_t *p_this )
102 decoder_t *p_dec = (decoder_t*)p_this;
104 return Open( p_dec, true );
107 /*****************************************************************************
108 * Close : aes3 decoder destruction
109 *****************************************************************************/
110 static void Close( vlc_object_t *p_this )
112 decoder_t *p_dec = (decoder_t*)p_this;
113 free( p_dec->p_sys );
116 /*****************************************************************************
117 * Decode: decodes an aes3 frame.
118 ****************************************************************************
119 * Beware, this function must be fed with complete frames (PES packet).
120 *****************************************************************************/
121 static block_t *Decode( decoder_t *p_dec, block_t **pp_block )
123 decoder_sys_t *p_sys = p_dec->p_sys;
125 block_t *p_aout_buffer;
126 int i_frame_length, i_bits;
128 p_block = Parse( p_dec, &i_frame_length, &i_bits, pp_block, false );
132 p_aout_buffer = decoder_NewAudioBuffer( p_dec, i_frame_length );
133 if( p_aout_buffer == NULL )
136 p_aout_buffer->i_pts = date_Get( &p_sys->end_date );
137 p_aout_buffer->i_length = date_Increment( &p_sys->end_date,
138 i_frame_length ) - p_aout_buffer->i_pts;
140 p_block->i_buffer -= AES3_HEADER_LEN;
141 p_block->p_buffer += AES3_HEADER_LEN;
145 uint8_t *p_out = p_aout_buffer->p_buffer;
147 while( p_block->i_buffer / 7 )
149 p_out[0] = Reverse8( p_block->p_buffer[0] );
150 p_out[1] = Reverse8( p_block->p_buffer[1] );
151 p_out[2] = Reverse8( p_block->p_buffer[2] );
153 p_out[3] = (Reverse8( p_block->p_buffer[3] ) >> 4) | ( (Reverse8( p_block->p_buffer[4] ) << 4) & 0xf0 );
154 p_out[4] = (Reverse8( p_block->p_buffer[4] ) >> 4) | ( (Reverse8( p_block->p_buffer[5] ) << 4) & 0xf0 );
155 p_out[5] = (Reverse8( p_block->p_buffer[5] ) >> 4) | ( (Reverse8( p_block->p_buffer[6] ) << 4) & 0xf0 );
157 p_block->i_buffer -= 7;
158 p_block->p_buffer += 7;
163 else if( i_bits == 20 )
165 uint8_t *p_out = p_aout_buffer->p_buffer;
167 while( p_block->i_buffer / 6 )
169 p_out[0] = ( (Reverse8( p_block->p_buffer[0] ) << 4) & 0xf0 );
170 p_out[1] = ( Reverse8( p_block->p_buffer[0]) >> 4 ) | ( (Reverse8( p_block->p_buffer[1]) << 4 ) & 0xf0 );
171 p_out[2] = ( Reverse8( p_block->p_buffer[1]) >> 4 ) | ( (Reverse8( p_block->p_buffer[2]) << 4 ) & 0xf0 );
173 p_out[3] = ( (Reverse8( p_block->p_buffer[3] ) << 4) & 0xf0 );
174 p_out[4] = ( Reverse8( p_block->p_buffer[3]) >> 4 ) | ( (Reverse8( p_block->p_buffer[4]) << 4 ) & 0xf0 );
175 p_out[5] = ( Reverse8( p_block->p_buffer[4]) >> 4 ) | ( (Reverse8( p_block->p_buffer[5]) << 4 ) & 0xf0 );
177 p_block->i_buffer -= 6;
178 p_block->p_buffer += 6;
184 uint8_t *p_out = p_aout_buffer->p_buffer;
186 assert( i_bits == 16 );
188 while( p_block->i_buffer / 5 )
190 p_out[0] = Reverse8( p_block->p_buffer[0] );
191 p_out[1] = Reverse8( p_block->p_buffer[1] );
193 p_out[2] = (Reverse8( p_block->p_buffer[2] ) >> 4) | ( (Reverse8( p_block->p_buffer[3] ) << 4) & 0xf0 );
194 p_out[3] = (Reverse8( p_block->p_buffer[3] ) >> 4) | ( (Reverse8( p_block->p_buffer[4] ) << 4) & 0xf0 );
196 p_block->i_buffer -= 5;
197 p_block->p_buffer += 5;
203 block_Release( p_block );
204 return p_aout_buffer;
207 /*****************************************************************************
208 * Packetize: packetizes an aes3 frame.
209 ****************************************************************************
210 * Beware, this function must be fed with complete frames (PES packet).
211 *****************************************************************************/
212 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
214 decoder_sys_t *p_sys = p_dec->p_sys;
216 int i_frame_length, i_bits;
218 p_block = Parse( p_dec, &i_frame_length, &i_bits, pp_block, true );
222 p_block->i_pts = p_block->i_dts = date_Get( &p_sys->end_date );
223 p_block->i_length = date_Increment( &p_sys->end_date, i_frame_length ) - p_block->i_pts;
225 /* Just pass on the incoming frame */
229 /*****************************************************************************
231 ****************************************************************************/
232 static int Open( decoder_t *p_dec, bool b_packetizer )
234 decoder_sys_t *p_sys;
236 if( p_dec->fmt_in.i_codec != VLC_CODEC_302M )
239 /* Allocate the memory needed to store the decoder's structure */
240 p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) );
242 if( unlikely( !p_sys ) )
246 date_Init( &p_sys->end_date, 48000, 1 );
247 date_Set( &p_sys->end_date, 0 );
249 /* Set output properties */
250 p_dec->fmt_out.i_cat = AUDIO_ES;
251 p_dec->fmt_out.audio.i_rate = 48000;
256 p_dec->fmt_out.i_codec = VLC_CODEC_302M;
258 p_dec->pf_decode_audio = NULL;
259 p_dec->pf_packetize = Packetize;
263 p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
264 p_dec->fmt_out.audio.i_bitspersample = 16;
266 p_dec->pf_decode_audio = Decode;
267 p_dec->pf_packetize = NULL;
272 static const unsigned int pi_original_channels[4] = {
273 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
274 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
275 AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
276 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
277 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
278 AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
279 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
280 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT |
281 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
282 AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
285 static block_t *Parse( decoder_t *p_dec, int *pi_frame_length, int *pi_bits,
286 block_t **pp_block, bool b_packetizer )
288 decoder_sys_t *p_sys = p_dec->p_sys;
295 if( !pp_block || !*pp_block ) return NULL;
298 *pp_block = NULL; /* So the packet doesn't get re-sent */
300 /* Date management */
301 if( p_block->i_pts > VLC_TS_INVALID &&
302 p_block->i_pts != date_Get( &p_sys->end_date ) )
304 date_Set( &p_sys->end_date, p_block->i_pts );
307 if( !date_Get( &p_sys->end_date ) )
309 /* We've just started the stream, wait for the first PTS. */
310 block_Release( p_block );
314 if( p_block->i_buffer <= AES3_HEADER_LEN )
316 msg_Err(p_dec, "frame is too short");
317 block_Release( p_block );
330 h = GetDWBE( p_block->p_buffer );
331 i_size = (h >> 16) & 0xffff;
332 i_channels = 2 + 2*( (h >> 14) & 0x03 );
333 i_bits = 16 + 4*( (h >> 4)&0x03 );
335 if( AES3_HEADER_LEN + i_size != p_block->i_buffer || i_bits > 24 )
337 msg_Err(p_dec, "frame has invalid header");
338 block_Release( p_block );
342 /* Set output properties */
345 p_dec->fmt_out.audio.i_bitspersample = i_bits;
349 p_dec->fmt_out.i_codec = i_bits == 16 ? VLC_CODEC_S16L : VLC_CODEC_S24L;
350 p_dec->fmt_out.audio.i_bitspersample = i_bits == 16 ? 16 : 24;
353 p_dec->fmt_out.audio.i_channels = i_channels;
354 p_dec->fmt_out.audio.i_original_channels = pi_original_channels[i_channels/2-1];
355 p_dec->fmt_out.audio.i_physical_channels = pi_original_channels[i_channels/2-1];
357 *pi_frame_length = (p_block->i_buffer - AES3_HEADER_LEN) / ( (4+i_bits) * i_channels / 8 );