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 it
9 * under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * 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>
33 #include <vlc_block_helper.h>
40 /*****************************************************************************
41 * decoder_sys_t : wma decoder descriptor
42 *****************************************************************************/
45 date_t end_date; /* To set the PTS */
46 WMADecodeContext wmadec; /* name is self explanative */
48 int32_t *p_output; /* buffer where the frames are rendered */
50 /* to not give too much samples at once to the audio output */
51 int8_t *p_samples; /* point into p_output */
52 unsigned int i_samples; /* number of buffered samples available */
55 /* FIXME : check supported configurations */
56 /* channel configuration */
57 static unsigned int pi_channels_maps[7] =
61 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
62 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
63 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
64 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
65 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
68 /*****************************************************************************
70 *****************************************************************************/
71 static int OpenDecoder ( vlc_object_t * );
72 static void CloseDecoder ( vlc_object_t * );
74 static block_t *DecodeFrame( decoder_t *, block_t ** );
76 /*****************************************************************************
78 *****************************************************************************/
80 set_category( CAT_INPUT );
81 set_subcategory( SUBCAT_INPUT_ACODEC );
82 set_description( _("WMA v1/v2 fixed point audio decoder") );
83 set_capability( "decoder", 80 );
84 add_shortcut( "wmafixed" )
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 block_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 );
98 if( i_samples == 0 ) return NULL;
100 if( !( p_buffer = decoder_NewAudioBuffer( p_dec, i_samples ) ) )
103 p_buffer->i_pts = date_Get( &p_sys->end_date );
104 p_buffer->i_length = date_Increment( &p_sys->end_date, i_samples )
107 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_buffer );
108 p_sys->p_samples += p_buffer->i_buffer;
109 p_sys->i_samples -= i_samples;
114 /*****************************************************************************
115 * OpenDecoder: probe the decoder and return score
116 *****************************************************************************/
117 static int OpenDecoder( vlc_object_t *p_this )
119 decoder_t *p_dec = (decoder_t*)p_this;
120 decoder_sys_t *p_sys;
122 if( p_dec->fmt_in.i_codec != VLC_CODEC_WMA1 &&
123 p_dec->fmt_in.i_codec != VLC_CODEC_WMA2 )
128 /* Allocate the memory needed to store the decoder's structure */
129 p_dec->p_sys = p_sys = (decoder_sys_t *)malloc(sizeof(decoder_sys_t));
133 memset( p_sys, 0, sizeof( decoder_sys_t ) );
136 date_Init( &p_sys->end_date, p_dec->fmt_in.audio.i_rate, 1 );
138 /* Set output properties */
139 p_dec->fmt_out.i_cat = AUDIO_ES;
140 p_dec->fmt_out.i_codec = VLC_CODEC_S32N;
141 p_dec->fmt_out.audio.i_bitspersample = p_dec->fmt_in.audio.i_bitspersample;
142 p_dec->fmt_out.audio.i_rate = p_dec->fmt_in.audio.i_rate;
144 p_dec->fmt_out.audio.i_channels = p_dec->fmt_in.audio.i_channels;
146 assert( p_dec->fmt_out.audio.i_channels <
147 ( sizeof( pi_channels_maps ) / sizeof( pi_channels_maps[0] ) ) );
149 p_dec->fmt_out.audio.i_original_channels =
150 p_dec->fmt_out.audio.i_physical_channels =
151 pi_channels_maps[p_dec->fmt_out.audio.i_channels];
153 /* aout core assumes this number is not 0 and uses it in divisions */
154 assert( p_dec->fmt_out.audio.i_physical_channels != 0 );
156 asf_waveformatex_t wfx;
157 wfx.rate = p_dec->fmt_in.audio.i_rate;
158 wfx.bitrate = p_dec->fmt_in.i_bitrate;
159 wfx.channels = p_dec->fmt_in.audio.i_channels;
160 wfx.blockalign = p_dec->fmt_in.audio.i_blockalign;
161 wfx.bitspersample = p_dec->fmt_in.audio.i_bitspersample;
163 msg_Dbg( p_dec, "samplerate %d bitrate %d channels %d align %d bps %d",
164 wfx.rate, wfx.bitrate, wfx.channels, wfx.blockalign,
167 if( p_dec->fmt_in.i_codec == VLC_CODEC_WMA1 )
168 wfx.codec_id = ASF_CODEC_ID_WMAV1;
169 else if( p_dec->fmt_in.i_codec == VLC_CODEC_WMA2 )
170 wfx.codec_id = ASF_CODEC_ID_WMAV2;
172 wfx.datalen = p_dec->fmt_in.i_extra;
173 if( wfx.datalen > 6 ) wfx.datalen = 6;
174 if( wfx.datalen > 0 )
175 memcpy( wfx.data, p_dec->fmt_in.p_extra, wfx.datalen );
178 if( wma_decode_init(&p_sys->wmadec, &wfx ) < 0 )
180 msg_Err( p_dec, "codec init failed" );
186 p_dec->pf_decode_audio = DecodeFrame;
191 /*****************************************************************************
192 * DecodeFrame: decodes a wma frame.
193 *****************************************************************************/
194 static block_t *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
196 decoder_sys_t *p_sys = p_dec->p_sys;
198 block_t *p_aout_buffer = NULL;
200 if( !pp_block || !*pp_block ) return NULL;
204 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
206 date_Set( &p_sys->end_date, 0 );
207 block_Release( p_block );
212 if( p_block->i_buffer <= 0 )
214 /* we already decoded the samples, just feed a few to aout */
215 if( p_sys->i_samples )
216 p_aout_buffer = SplitBuffer( p_dec );
217 if( !p_sys->i_samples )
218 { /* we need to decode new samples now */
219 free( p_sys->p_output );
220 p_sys->p_output = NULL;
221 block_Release( p_block );
224 return p_aout_buffer;
227 /* Date management */
228 if( p_block->i_pts > VLC_TS_INVALID &&
229 p_block->i_pts != date_Get( &p_sys->end_date ) )
231 date_Set( &p_sys->end_date, p_block->i_pts );
232 /* don't reuse the same pts */
233 p_block->i_pts = VLC_TS_INVALID;
235 else if( !date_Get( &p_sys->end_date ) )
237 /* We've just started the stream, wait for the first PTS. */
238 block_Release( p_block );
242 if( wma_decode_superframe_init( &p_sys->wmadec, p_block->p_buffer,
243 p_block->i_buffer ) == 0 )
245 msg_Err( p_dec, "failed initializing wmafixed decoder" );
246 block_Release( p_block );
251 if( p_sys->wmadec.nb_frames <= 0 )
253 msg_Err( p_dec, "can not decode, invalid ASF packet ?" );
254 block_Release( p_block );
260 size_t i_buffer = BLOCK_MAX_SIZE * MAX_CHANNELS * p_sys->wmadec.nb_frames;
261 free( p_sys->p_output );
262 p_sys->p_output = malloc(i_buffer * sizeof(int32_t) );
263 p_sys->p_samples = (int8_t*)p_sys->p_output;
265 if( !p_sys->p_output )
267 /* OOM, will try a bit later if VLC hasn't been killed */
268 block_Release( p_block );
272 p_sys->i_samples = 0;
274 for( int i = 0 ; i < p_sys->wmadec.nb_frames; i++ )
278 i_samples = wma_decode_superframe_frame( &p_sys->wmadec,
279 p_sys->p_output + p_sys->i_samples * p_sys->wmadec.nb_channels,
280 p_block->p_buffer, p_block->i_buffer );
285 "wma_decode_superframe_frame() failed for frame %d", i );
286 free( p_sys->p_output );
287 p_sys->p_output = NULL;
290 p_sys->i_samples += i_samples; /* advance in the samples buffer */
293 p_block->i_buffer = 0; /* this block has been decoded */
295 for( size_t s = 0 ; s < i_buffer; s++ )
296 p_sys->p_output[s] <<= 2; /* Q30 -> Q32 translation */
298 p_aout_buffer = SplitBuffer( p_dec );
299 assert( p_aout_buffer );
301 return p_aout_buffer;
304 /*****************************************************************************
305 * CloseDecoder : wma decoder destruction
306 *****************************************************************************/
307 static void CloseDecoder( vlc_object_t *p_this )
309 decoder_sys_t *p_sys = ((decoder_t*)p_this)->p_sys;
311 free( p_sys->p_output );