1 /*****************************************************************************
2 * mpgatofixed32.c: MPEG-1 & 2 audio layer I, II, III + MPEG 2.5 decoder,
3 * using MAD (MPEG Audio Decoder)
4 *****************************************************************************
5 * Copyright (C) 2001 by Jean-Paul Saman
8 * Authors: Christophe Massiot <massiot@via.ecp.fr>
9 * Jean-Paul Saman <jpsaman@wxs.nl>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
29 #include <stdlib.h> /* malloc(), free() */
30 #include <string.h> /* strdup() */
35 #include <vlc/decoder.h>
36 #include "aout_internal.h"
37 #include "vlc_filter.h"
39 /*****************************************************************************
41 *****************************************************************************/
42 static int Create ( vlc_object_t * );
43 static void Destroy ( vlc_object_t * );
44 static void DoWork ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
47 static int OpenFilter ( vlc_object_t * );
48 static void CloseFilter( vlc_object_t * );
49 static block_t *Convert( filter_t *, block_t * );
51 /*****************************************************************************
53 *****************************************************************************/
56 struct mad_stream mad_stream;
57 struct mad_frame mad_frame;
58 struct mad_synth mad_synth;
61 /*****************************************************************************
63 *****************************************************************************/
65 set_description( _("MPEG audio decoder") );
66 set_capability( "audio filter", 100 );
67 set_callbacks( Create, Destroy );
70 set_description( _("MPEG audio decoder") );
71 set_capability( "audio filter2", 100 );
72 set_callbacks( OpenFilter, CloseFilter );
75 /*****************************************************************************
77 *****************************************************************************/
78 static int Create( vlc_object_t *p_this )
80 aout_filter_t *p_filter = (aout_filter_t *)p_this;
81 struct filter_sys_t *p_sys;
83 if ( (p_filter->input.i_format != VLC_FOURCC('m','p','g','a')
84 && p_filter->input.i_format != VLC_FOURCC('m','p','g','3'))
85 || (p_filter->output.i_format != VLC_FOURCC('f','l','3','2')
86 && p_filter->output.i_format != VLC_FOURCC('f','i','3','2')) )
91 if ( !AOUT_FMTS_SIMILAR( &p_filter->input, &p_filter->output ) )
96 /* Allocate the memory needed to store the module's structure */
97 p_sys = malloc( sizeof(filter_sys_t) );
98 p_filter->p_sys = (struct aout_filter_sys_t *)p_sys;
101 msg_Err( p_filter, "out of memory" );
105 /* Initialize libmad */
106 mad_stream_init( &p_sys->mad_stream );
107 mad_frame_init( &p_sys->mad_frame );
108 mad_synth_init( &p_sys->mad_synth );
109 mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
111 p_filter->pf_do_work = DoWork;
112 p_filter->b_in_place = 0;
117 /*****************************************************************************
118 * DoWork: decode an MPEG audio frame.
119 *****************************************************************************/
120 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
121 aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
123 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
125 p_out_buf->i_nb_samples = p_in_buf->i_nb_samples;
126 p_out_buf->i_nb_bytes = p_in_buf->i_nb_samples * sizeof(vlc_fixed_t) *
127 aout_FormatNbChannels( &p_filter->input );
129 /* Do the actual decoding now. */
130 mad_stream_buffer( &p_sys->mad_stream, p_in_buf->p_buffer,
131 p_in_buf->i_nb_bytes );
132 if ( mad_frame_decode( &p_sys->mad_frame, &p_sys->mad_stream ) == -1 )
134 msg_Dbg( p_aout, "libmad error: %s",
135 mad_stream_errorstr( &p_sys->mad_stream ) );
136 if( p_filter->output.i_format == VLC_FOURCC('f','l','3','2') )
139 int i_size = p_out_buf->i_nb_bytes / sizeof(float);
141 float * a = (float *)p_out_buf->p_buffer;
142 for ( i = 0 ; i < i_size ; i++ )
147 memset( p_out_buf->p_buffer, 0, p_out_buf->i_nb_bytes );
152 mad_synth_frame( &p_sys->mad_synth, &p_sys->mad_frame );
154 if ( p_filter->output.i_format == VLC_FOURCC('f','i','3','2') )
156 /* Interleave and keep buffers in mad_fixed_t format */
157 mad_fixed_t * p_samples = (mad_fixed_t *)p_out_buf->p_buffer;
158 struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
159 unsigned int i_samples = p_pcm->length;
160 mad_fixed_t const * p_left = p_pcm->samples[0];
161 mad_fixed_t const * p_right = p_pcm->samples[1];
163 switch ( p_pcm->channels )
166 while ( i_samples-- )
168 *p_samples++ = *p_left++;
169 *p_samples++ = *p_right++;
174 p_filter->p_vlc->pf_memcpy( p_samples, p_left,
175 i_samples * sizeof(mad_fixed_t) );
179 msg_Err( p_filter, "cannot interleave %i channels",
186 float * p_samples = (float *)p_out_buf->p_buffer;
187 struct mad_pcm * p_pcm = &p_sys->mad_synth.pcm;
188 unsigned int i_samples = p_pcm->length;
189 mad_fixed_t const * p_left = p_pcm->samples[0];
190 mad_fixed_t const * p_right = p_pcm->samples[1];
191 float f_temp = (float)FIXED32_ONE;
193 switch ( p_pcm->channels )
196 while ( i_samples-- )
198 *p_samples++ = (float)*p_left++ / f_temp;
199 *p_samples++ = (float)*p_right++ / f_temp;
204 while ( i_samples-- )
206 *p_samples++ = (float)*p_left++ / f_temp;
211 msg_Err( p_filter, "cannot interleave %i channels",
217 /*****************************************************************************
218 * Destroy : deallocate data structures
219 *****************************************************************************/
220 static void Destroy( vlc_object_t *p_this )
222 aout_filter_t *p_filter = (aout_filter_t *)p_this;
223 filter_sys_t *p_sys = (filter_sys_t *)p_filter->p_sys;
225 mad_synth_finish( &p_sys->mad_synth );
226 mad_frame_finish( &p_sys->mad_frame );
227 mad_stream_finish( &p_sys->mad_stream );
231 /*****************************************************************************
233 *****************************************************************************/
234 static int OpenFilter( vlc_object_t *p_this )
236 filter_t *p_filter = (filter_t *)p_this;
239 if( p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','a') &&
240 p_filter->fmt_in.i_codec != VLC_FOURCC('m','p','g','3') )
245 /* Allocate the memory needed to store the module's structure */
246 p_sys = p_filter->p_sys = malloc( sizeof(filter_sys_t) );
249 msg_Err( p_filter, "out of memory" );
253 p_filter->pf_audio_filter = Convert;
255 /* Initialize libmad */
256 mad_stream_init( &p_sys->mad_stream );
257 mad_frame_init( &p_sys->mad_frame );
258 mad_synth_init( &p_sys->mad_synth );
259 mad_stream_options( &p_sys->mad_stream, MAD_OPTION_IGNORECRC );
261 msg_Dbg( p_this, "%4.4s->%4.4s, bits per sample: %i",
262 (char *)&p_filter->fmt_in.i_codec,
263 (char *)&p_filter->fmt_out.i_codec,
264 p_filter->fmt_out.audio.i_bitspersample );
266 p_filter->fmt_out.i_codec =
267 p_filter->fmt_out.audio.i_format = VLC_FOURCC('f','l','3','2');
268 p_filter->fmt_out.audio.i_bitspersample = sizeof(float);
273 /*****************************************************************************
274 * CloseFilter : deallocate data structures
275 *****************************************************************************/
276 static void CloseFilter( vlc_object_t *p_this )
278 filter_t *p_filter = (filter_t *)p_this;
279 filter_sys_t *p_sys = p_filter->p_sys;
281 mad_synth_finish( &p_sys->mad_synth );
282 mad_frame_finish( &p_sys->mad_frame );
283 mad_stream_finish( &p_sys->mad_stream );
287 static block_t *Convert( filter_t *p_filter, block_t *p_block )
289 aout_filter_t aout_filter;
290 aout_buffer_t in_buf, out_buf;
294 if( !p_block || !p_block->i_samples )
296 if( p_block ) p_block->pf_release( p_block );
300 i_out_size = p_block->i_samples *
301 p_filter->fmt_out.audio.i_bitspersample *
302 p_filter->fmt_out.audio.i_channels / 8;
304 p_out = p_filter->pf_audio_buffer_new( p_filter, i_out_size );
307 msg_Warn( p_filter, "can't get output buffer" );
308 p_block->pf_release( p_block );
312 p_out->i_samples = p_block->i_samples;
313 p_out->i_dts = p_block->i_dts;
314 p_out->i_pts = p_block->i_pts;
315 p_out->i_length = p_block->i_length;
317 aout_filter.p_sys = (struct aout_filter_sys_t *)p_filter->p_sys;
318 aout_filter.input = p_filter->fmt_in.audio;
319 aout_filter.input.i_format = p_filter->fmt_in.i_codec;
320 aout_filter.output = p_filter->fmt_out.audio;
321 aout_filter.output.i_format = p_filter->fmt_out.i_codec;
323 in_buf.p_buffer = p_block->p_buffer;
324 in_buf.i_nb_bytes = p_block->i_buffer;
325 in_buf.i_nb_samples = p_block->i_samples;
326 out_buf.p_buffer = p_out->p_buffer;
327 out_buf.i_nb_bytes = p_out->i_buffer;
328 out_buf.i_nb_samples = p_out->i_samples;
330 DoWork( (aout_instance_t *)p_filter, &aout_filter, &in_buf, &out_buf );
332 p_block->pf_release( p_block );
334 p_out->i_buffer = out_buf.i_nb_bytes;
335 p_out->i_samples = out_buf.i_nb_samples;