modules/codec/wmafixed/wma.c

   1 /*****************************************************************************
   2  * wma.c: wma decoder using integer decoder from Rockbox, based on FFmpeg
   3  *****************************************************************************
   4  * Copyright (C) 2008-2009 M2X
   5  *
   6  * Authors: Rafaël Carré <rcarre@m2x.nl>
   7  *
   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.
  12  *
  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.
  17  *
  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  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <vlc_common.h>
  31 #include <vlc_plugin.h>
  32 #include <vlc_codec.h>
  33 #include <vlc_aout.h>
  34 #include <vlc_block_helper.h>
  35 #include <vlc_bits.h>
  36
  37 #include <assert.h>
  38
  39 #include "wmadec.h"
  40
  41 /*****************************************************************************
  42  * decoder_sys_t : wma decoder descriptor
  43  *****************************************************************************/
  44 struct decoder_sys_t
  45 {
  46     date_t end_date; /* To set the PTS */
  47     WMADecodeContext wmadec; /* name is self explanative */
  48
  49     int32_t *p_output; /* buffer where the frames are rendered */
  50
  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 */
  54 };
  55
  56 /* FIXME : check supported configurations */
  57 /* channel configuration */
  58 static unsigned int pi_channels_maps[7] =
  59 {
  60     0,
  61     AOUT_CHAN_CENTER,
  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
  67 };
  68
  69 /*****************************************************************************
  70  * Local prototypes
  71  *****************************************************************************/
  72 static int  OpenDecoder   ( vlc_object_t * );
  73 static void CloseDecoder  ( vlc_object_t * );
  74
  75 static aout_buffer_t *DecodeFrame  ( decoder_t *, block_t ** );
  76
  77 /*****************************************************************************
  78  * Module descriptor
  79  *****************************************************************************/
  80 vlc_module_begin();
  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", 80 );
  85     add_shortcut( "wmafixed" )
  86     set_callbacks( OpenDecoder, CloseDecoder );
  87 vlc_module_end();
  88
  89 /*****************************************************************************
  90  * SplitBuffer: Needed because aout really doesn't like big audio chunk and
  91  * wma produces easily > 30000 samples...
  92  *****************************************************************************/
  93 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
  94 {
  95     decoder_sys_t *p_sys = p_dec->p_sys;
  96     unsigned int i_samples = __MIN( p_sys->i_samples, 2048 );
  97     aout_buffer_t *p_buffer;
  98
  99     if( i_samples == 0 ) return NULL;
 100
 101     if( !( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) )
 102         return NULL;
 103
 104     p_buffer->i_pts = date_Get( &p_sys->end_date );
 105     p_buffer->i_length = date_Increment( &p_sys->end_date, i_samples )
 106                          - p_buffer->i_pts;
 107
 108     memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_buffer );
 109     p_sys->p_samples += p_buffer->i_buffer;
 110     p_sys->i_samples -= i_samples;
 111
 112     return p_buffer;
 113 }
 114
 115 /*****************************************************************************
 116  * OpenDecoder: probe the decoder and return score
 117  *****************************************************************************/
 118 static int OpenDecoder( vlc_object_t *p_this )
 119 {
 120     decoder_t *p_dec = (decoder_t*)p_this;
 121     decoder_sys_t *p_sys;
 122
 123     if( p_dec->fmt_in.i_codec != VLC_CODEC_WMA1 &&
 124         p_dec->fmt_in.i_codec != VLC_CODEC_WMA2 )
 125     {
 126         return VLC_EGENERIC;
 127     }
 128
 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));
 131     if( !p_sys )
 132         return VLC_ENOMEM;
 133
 134     memset( p_sys, 0, sizeof( decoder_sys_t ) );
 135
 136     /* Date */
 137     date_Init( &p_sys->end_date, p_dec->fmt_in.audio.i_rate, 1 );
 138
 139     /* Set output properties */
 140     p_dec->fmt_out.i_cat = AUDIO_ES;
 141     p_dec->fmt_out.i_codec = VLC_CODEC_FI32;
 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;
 144
 145     p_dec->fmt_out.audio.i_channels = p_dec->fmt_in.audio.i_channels;
 146
 147     assert( p_dec->fmt_out.audio.i_channels <
 148         ( sizeof( pi_channels_maps ) / sizeof( pi_channels_maps[0] ) ) );
 149
 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];
 153
 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 );
 156
 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;
 163
 164     msg_Dbg( p_dec, "samplerate %d bitrate %d channels %d align %d bps %d",
 165         wfx.rate, wfx.bitrate, wfx.channels, wfx.blockalign,
 166         wfx.bitspersample );
 167
 168     if( p_dec->fmt_in.i_codec == VLC_CODEC_WMA1 )
 169         wfx.codec_id = ASF_CODEC_ID_WMAV1;
 170     else if( p_dec->fmt_in.i_codec == VLC_CODEC_WMA2 )
 171         wfx.codec_id = ASF_CODEC_ID_WMAV2;
 172
 173     wfx.datalen = p_dec->fmt_in.i_extra;
 174     if( wfx.datalen > 6 ) wfx.datalen = 6;
 175     if( wfx.datalen > 0 )
 176         memcpy( wfx.data, p_dec->fmt_in.p_extra, wfx.datalen );
 177
 178     /* Init codec */
 179     if( wma_decode_init(&p_sys->wmadec, &wfx ) < 0 )
 180     {
 181         msg_Err( p_dec, "codec init failed" );
 182         free( p_sys );
 183         return VLC_EGENERIC;
 184     }
 185
 186     /* Set callback */
 187     p_dec->pf_decode_audio = DecodeFrame;
 188
 189     return VLC_SUCCESS;
 190 }
 191
 192 /*****************************************************************************
 193  * DecodeFrame: decodes a wma frame.
 194  *****************************************************************************/
 195 static aout_buffer_t *DecodeFrame( decoder_t *p_dec, block_t **pp_block )
 196 {
 197     decoder_sys_t *p_sys = p_dec->p_sys;
 198     block_t       *p_block;
 199     aout_buffer_t *p_aout_buffer = NULL;
 200 #ifdef NDEBUG
 201     mtime_t start = mdate(); /* for statistics */
 202 #endif
 203
 204     if( !pp_block || !*pp_block ) return NULL;
 205
 206     p_block = *pp_block;
 207
 208     if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
 209     {
 210         date_Set( &p_sys->end_date, 0 );
 211         block_Release( p_block );
 212         *pp_block = NULL;
 213         return NULL;
 214     }
 215
 216     if( p_block->i_buffer <= 0 )
 217     {
 218         /* we already decoded the samples, just feed a few to aout */
 219         if( p_sys->i_samples )
 220             p_aout_buffer = SplitBuffer( p_dec );
 221         if( !p_sys->i_samples )
 222         {   /* we need to decode new samples now */
 223             free( p_sys->p_output );
 224             p_sys->p_output = NULL;
 225             block_Release( p_block );
 226             *pp_block = NULL;
 227         }
 228         return p_aout_buffer;
 229     }
 230
 231     /* Date management */
 232     if( p_block->i_pts > VLC_TS_INVALID &&
 233         p_block->i_pts != date_Get( &p_sys->end_date ) )
 234     {
 235         date_Set( &p_sys->end_date, p_block->i_pts );
 236         /* don't reuse the same pts */
 237         p_block->i_pts = VLC_TS_INVALID;
 238     }
 239     else if( !date_Get( &p_sys->end_date ) )
 240     {
 241         /* We've just started the stream, wait for the first PTS. */
 242         block_Release( p_block );
 243         return NULL;
 244     }
 245
 246     if( wma_decode_superframe_init( &p_sys->wmadec, p_block->p_buffer,
 247             p_block->i_buffer ) == 0 )
 248     {
 249         msg_Err( p_dec, "failed initializing wmafixed decoder" );
 250         block_Release( p_block );
 251         *pp_block = NULL;
 252         return NULL;
 253     }
 254
 255     if( p_sys->wmadec.nb_frames <= 0 )
 256     {
 257         msg_Err( p_dec, "can not decode, invalid ASF packet ?" );
 258         block_Release( p_block );
 259         *pp_block = NULL;
 260         return NULL;
 261     }
 262
 263     /* worst case */
 264     size_t i_buffer = BLOCK_MAX_SIZE * MAX_CHANNELS * p_sys->wmadec.nb_frames;
 265     free( p_sys->p_output );
 266     p_sys->p_output = malloc(i_buffer * sizeof(int32_t) );
 267     p_sys->p_samples = (int8_t*)p_sys->p_output;
 268
 269     if( !p_sys->p_output )
 270     {
 271         /* OOM, will try a bit later if VLC hasn't been killed */
 272         block_Release( p_block );
 273         return NULL;
 274     }
 275
 276     p_sys->i_samples = 0;
 277
 278     for( int i = 0 ; i < p_sys->wmadec.nb_frames; i++ )
 279     {
 280         int i_samples = 0;
 281
 282         i_samples = wma_decode_superframe_frame( &p_sys->wmadec,
 283                  p_sys->p_output + p_sys->i_samples * p_sys->wmadec.nb_channels,
 284                  p_block->p_buffer, p_block->i_buffer );
 285
 286         if( i_samples < 0 )
 287         {
 288             msg_Warn( p_dec,
 289                 "wma_decode_superframe_frame() failed for frame %d", i );
 290             free( p_sys->p_output );
 291             p_sys->p_output = NULL;
 292             return NULL;
 293         }
 294         p_sys->i_samples += i_samples; /* advance in the samples buffer */
 295     }
 296
 297     p_block->i_buffer = 0; /* this block has been decoded */
 298
 299     for( size_t s = 0 ; s < i_buffer; s++ )
 300         p_sys->p_output[s] >>= 2; /* Q30 -> Q28 translation */
 301
 302     p_aout_buffer = SplitBuffer( p_dec );
 303     assert( p_aout_buffer );
 304
 305 #ifdef NDEBUG
 306     msg_Dbg( p_dec, "%s took %"PRIi64" us",__func__,mdate()-start);
 307 #endif
 308     return p_aout_buffer;
 309 }
 310
 311 /*****************************************************************************
 312  * CloseDecoder : wma decoder destruction
 313  *****************************************************************************/
 314 static void CloseDecoder( vlc_object_t *p_this )
 315 {
 316     decoder_sys_t *p_sys = ((decoder_t*)p_this)->p_sys;
 317
 318     free( p_sys->p_output );
 319     free( p_sys );
 320 }