1 /*****************************************************************************
2 * wma.c: wma decoder using integer decoder from Rockbox, based on FFmpeg
3 *****************************************************************************
4 * Copyright (C) 2008-2009 M2X
6 * Authors: Rafaël Carré <rcarre@m2x.nl>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
23 /*****************************************************************************
25 *****************************************************************************/
30 #include <vlc_common.h>
31 #include <vlc_plugin.h>
32 #include <vlc_codec.h>
34 #include <vlc_block_helper.h>
41 /*****************************************************************************
42 * decoder_sys_t : wma decoder descriptor
43 *****************************************************************************/
46 audio_date_t end_date; /* To set the PTS */
47 WMADecodeContext wmadec; /* name is self explanative */
49 int32_t *p_output; /* buffer where the frames are rendered */
51 /* to not give too much samples at once to the audio output */
52 int8_t *p_samples; /* point into p_output */
53 unsigned int i_samples; /* number of buffered samples available */
56 /* FIXME : check supported configurations */
57 /* channel configuration */
58 static unsigned int pi_channels_maps[7] =
62 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
63 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
64 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
65 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
66 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
69 /*****************************************************************************
71 *****************************************************************************/
72 static int OpenDecoder ( vlc_object_t * );
73 static void CloseDecoder ( vlc_object_t * );
75 static aout_buffer_t *DecodeFrame ( decoder_t *, block_t ** );
77 /*****************************************************************************
79 *****************************************************************************/
81 set_category( CAT_INPUT );
82 set_subcategory( SUBCAT_INPUT_ACODEC );
83 set_description( _("WMA v1/v2 fixed point audio decoder") );
84 set_capability( "decoder", 100 );
85 set_callbacks( OpenDecoder, CloseDecoder );
88 /*****************************************************************************
89 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
90 * wma produces easily > 30000 samples...
91 *****************************************************************************/
92 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
94 decoder_sys_t *p_sys = p_dec->p_sys;
95 unsigned int i_samples = __MIN( p_sys->i_samples, 2048 );
96 aout_buffer_t *p_buffer;
98 if( i_samples == 0 ) return NULL;
100 if( !( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) )
103 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
104 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date, i_samples );
106 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
107 p_sys->p_samples += p_buffer->i_nb_bytes;
108 p_sys->i_samples -= i_samples;
113 /*****************************************************************************
114 * OpenDecoder: probe the decoder and return score
115 *****************************************************************************/
116 static int OpenDecoder( vlc_object_t *p_this )
118 decoder_t *p_dec = (decoder_t*)p_this;
119 decoder_sys_t *p_sys;
121 if( p_dec->fmt_in.i_codec != VLC_FOURCC('w','m','a','1') &&
122 p_dec->fmt_in.i_codec != VLC_FOURCC('W','M','A','1') &&
123 p_dec->fmt_in.i_codec != VLC_FOURCC('w','m','a','2') &&
124 p_dec->fmt_in.i_codec != VLC_FOURCC('W','M','A','2') )
129 /* Allocate the memory needed to store the decoder's structure */
130 p_dec->p_sys = p_sys = (decoder_sys_t *)malloc(sizeof(decoder_sys_t));
134 memset( p_sys, 0, sizeof( decoder_sys_t ) );
137 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
139 /* Set output properties */
140 p_dec->fmt_out.i_cat = AUDIO_ES;
141 p_dec->fmt_out.i_codec = VLC_FOURCC('f','i','3','2');
142 p_dec->fmt_out.audio.i_bitspersample = p_dec->fmt_in.audio.i_bitspersample;
143 p_dec->fmt_out.audio.i_rate = p_dec->fmt_in.audio.i_rate;
145 p_dec->fmt_out.audio.i_channels = p_dec->fmt_in.audio.i_channels;
147 assert( p_dec->fmt_out.audio.i_channels <
148 ( sizeof( pi_channels_maps ) / sizeof( pi_channels_maps[0] ) ) );
150 p_dec->fmt_out.audio.i_original_channels =
151 p_dec->fmt_out.audio.i_physical_channels =
152 pi_channels_maps[p_dec->fmt_out.audio.i_channels];
154 /* aout core assumes this number is not 0 and uses it in divisions */
155 assert( p_dec->fmt_out.audio.i_physical_channels != 0 );
157 asf_waveformatex_t wfx;
158 wfx.rate = p_dec->fmt_in.audio.i_rate;
159 wfx.bitrate = p_dec->fmt_in.i_bitrate;
160 wfx.channels = p_dec->fmt_in.audio.i_channels;
161 wfx.blockalign = p_dec->fmt_in.audio.i_blockalign;
162 wfx.bitspersample = p_dec->fmt_in.audio.i_bitspersample;
164 msg_Dbg( p_dec, "samplerate %d bitrate %d channels %d align %d bps %d",
165 wfx.rate, wfx.bitrate, wfx.channels, wfx.blockalign,
168 if( p_dec->fmt_in.i_codec == VLC_FOURCC('w','m','a','1')
169 || p_dec->fmt_in.i_codec == VLC_FOURCC('W','M','A','1') )
170 wfx.codec_id = ASF_CODEC_ID_WMAV1;
171 else if( p_dec->fmt_in.i_codec == VLC_FOURCC('W','M','A','2')
172 || p_dec->fmt_in.i_codec == VLC_FOURCC('w','m','a','2') )
173 wfx.codec_id = ASF_CODEC_ID_WMAV2;
175 wfx.datalen = p_dec->fmt_in.i_extra;
176 if( wfx.datalen > 6 ) wfx.datalen = 6;
177 if( wfx.datalen > 0 )
178 memcpy( wfx.data, p_dec->fmt_in.p_extra, wfx.datalen );
181 if( wma_decode_init(&p_sys->wmadec, &wfx ) < 0 )
183 msg_Err( p_dec, "codec init failed" );
189 p_dec->pf_decode_audio = DecodeFrame;
194 /*****************************************************************************
195 * DecodeFrame: decodes a wma frame.
196 *****************************************************************************/
197 static aout_buffer_t *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
199 decoder_sys_t *p_sys = p_dec->p_sys;
201 mtime_t start = mdate(); /* for statistics */
202 aout_buffer_t *p_aout_buffer = NULL;
204 if( !pp_block || !*pp_block ) return NULL;
208 if( p_block->i_buffer <= 0 )
210 /* we already decoded the samples, just feed a few to aout */
211 if( p_sys->i_samples )
212 p_aout_buffer = SplitBuffer( p_dec );
213 if( !p_sys->i_samples )
214 { /* we need to decode new samples now */
215 free( p_sys->p_output );
216 p_sys->p_output = NULL;
217 block_Release( p_block );
220 return p_aout_buffer;
223 /* Date management */
224 if( p_block->i_pts > 0 &&
225 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
227 aout_DateSet( &p_sys->end_date, p_block->i_pts );
228 /* don't reuse the same pts */
231 else if( !aout_DateGet( &p_sys->end_date ) )
233 /* We've just started the stream, wait for the first PTS. */
234 block_Release( p_block );
238 wma_decode_superframe_init( &p_sys->wmadec, p_block->p_buffer,
241 if( p_sys->wmadec.nb_frames <= 0 )
243 msg_Err( p_dec, "can not decode, invalid ASF packet ?" );
244 block_Release( p_block );
250 size_t i_buffer = BLOCK_MAX_SIZE * MAX_CHANNELS * p_sys->wmadec.nb_frames;
251 p_sys->p_output = malloc(i_buffer * sizeof(int32_t) );
252 p_sys->p_samples = (int8_t*)p_sys->p_output;
254 if( !p_sys->p_output )
256 /* OOM, will try a bit later if VLC hasn't been killed */
257 block_Release( p_block );
261 p_sys->i_samples = 0;
263 for( int i = 0 ; i < p_sys->wmadec.nb_frames; i++ )
267 i_samples = wma_decode_superframe_frame( &p_sys->wmadec,
268 p_sys->p_output + p_sys->i_samples * p_sys->wmadec.nb_channels,
269 p_block->p_buffer, p_block->i_buffer );
273 "wma_decode_superframe_frame() failed for frame %d", i );
275 p_sys->i_samples += i_samples; /* advance in the samples buffer */
278 p_block->i_buffer = 0; /* this block has been decoded */
280 for( size_t s = 0 ; s < i_buffer; s++ )
281 p_sys->p_output[s] >>= 2; /* Q30 -> Q28 translation */
283 p_aout_buffer = SplitBuffer( p_dec );
284 assert( p_aout_buffer );
287 msg_Dbg( p_dec, "%s took %"PRIi64" us",__func__,mdate()-start);
289 return p_aout_buffer;
292 /*****************************************************************************
293 * CloseDecoder : wma decoder destruction
294 *****************************************************************************/
295 static void CloseDecoder( vlc_object_t *p_this )
297 decoder_sys_t *p_sys = ((decoder_t*)p_this)->p_sys;
299 free( p_sys->p_output );