decoder.cpp

00001 /*
00002  * libmad - MPEG audio decoder library
00003  * Copyright (C) 2000-2004 Underbit Technologies, Inc.
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License as published by
00007  * the Free Software Foundation; either version 2 of the License, or
00008  * (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software
00017  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018  *
00019  * $Id: decoder.c,v 1.1 2010/11/23 20:12:57 andy Exp $
00020  */
00021 
00022 #  include "config.h"
00023 
00024 # include "global.h"
00025 
00026 
00027 # ifdef HAVE_SYS_TYPES_H
00028 #  include <sys/types.h>
00029 # endif
00030 
00031 # ifdef HAVE_SYS_WAIT_H
00032 #  include <sys/wait.h>
00033 # endif
00034 
00035 # ifdef HAVE_UNISTD_H
00036 #  include <unistd.h>
00037 # endif
00038 
00039 # ifdef HAVE_FCNTL_H
00040 #  include <fcntl.h>
00041 # endif
00042 
00043 # include <stdlib.h>
00044 
00045 # ifdef HAVE_ERRNO_H
00046 #  include <errno.h>
00047 # endif
00048 
00049 # include "stream.h"
00050 # include "frame.h"
00051 # include "synth.h"
00052 # include "decoder.h"
00053 
00054 /*
00055  * NAME:        decoder->init()
00056  * DESCRIPTION: initialize a decoder object with callback routines
00057  */
00058 void mad_decoder_init(struct mad_decoder *decoder, void *data,
00059                       enum mad_flow (*input_func)(void *,
00060                                                   struct mad_stream *),
00061                       enum mad_flow (*header_func)(void *,
00062                                                    struct mad_header const *),
00063                       enum mad_flow (*filter_func)(void *,
00064                                                    struct mad_stream const *,
00065                                                    struct mad_frame *),
00066                       enum mad_flow (*output_func)(void *,
00067                                                    struct mad_header const *,
00068                                                    struct mad_pcm *),
00069                       enum mad_flow (*error_func)(void *,
00070                                                   struct mad_stream *,
00071                                                   struct mad_frame *),
00072                       enum mad_flow (*message_func)(void *,
00073                                                     void *, unsigned int *))
00074 {
00075   decoder->mode         = (enum mad_decoder_mode)-1;
00076 
00077   decoder->options      = 0;
00078 
00079 
00080   decoder->sync         = 0;
00081 
00082   decoder->cb_data      = data;
00083 
00084   decoder->input_func   = input_func;
00085   decoder->header_func  = header_func;
00086   decoder->filter_func  = filter_func;
00087   decoder->output_func  = output_func;
00088   decoder->error_func   = error_func;
00089   decoder->message_func = message_func;
00090 }
00091 
00092 int mad_decoder_finish(struct mad_decoder *decoder)
00093 {
00094   return 0;
00095 }
00096 
00097 
00098 static
00099 enum mad_flow error_default(void *data, struct mad_stream *stream,
00100                             struct mad_frame *frame)
00101 {
00102   int *bad_last_frame = (int *)data;
00103 
00104   switch (stream->error) {
00105   case MAD_ERROR_BADCRC:
00106     if (*bad_last_frame)
00107       mad_frame_mute(frame);
00108     else
00109       *bad_last_frame = 1;
00110 
00111     return MAD_FLOW_IGNORE;
00112 
00113   default:
00114     return MAD_FLOW_CONTINUE;
00115   }
00116 }
00117 
00118 static
00119 int run_sync(struct mad_decoder *decoder)
00120 {
00121   enum mad_flow (*error_func)(void *, struct mad_stream *, struct mad_frame *);
00122   void *error_data;
00123   int bad_last_frame = 0;
00124   struct mad_stream *stream;
00125   struct mad_frame *frame;
00126   struct mad_synth *synth;
00127   int result = 0;
00128 
00129   if (decoder->input_func == 0)
00130     return 0;
00131 
00132   if (decoder->error_func) {
00133     error_func = decoder->error_func;
00134     error_data = decoder->cb_data;
00135   }
00136   else {
00137     error_func = error_default;
00138     error_data = &bad_last_frame;
00139   }
00140 
00141   stream = &decoder->sync->stream;
00142   frame  = &decoder->sync->frame;
00143   synth  = decoder->sync->synth;
00144 
00145   mad_stream_init(stream);
00146   mad_frame_init(frame);
00147   mad_synth_init(synth);
00148 
00149   mad_stream_options(stream, decoder->options);
00150 
00151   do {
00152     switch (decoder->input_func(decoder->cb_data, stream)) {
00153     case MAD_FLOW_STOP:
00154       goto done;
00155     case MAD_FLOW_BREAK:
00156       goto fail;
00157     case MAD_FLOW_IGNORE:
00158       continue;
00159     case MAD_FLOW_CONTINUE:
00160       break;
00161     }
00162 
00163     while (1) {
00164       if (decoder->header_func) {
00165         if (mad_header_decode(&frame->header, stream) == -1) {
00166           if (!MAD_RECOVERABLE(stream->error))
00167             break;
00168 
00169           switch (error_func(error_data, stream, frame)) {
00170           case MAD_FLOW_STOP:
00171             goto done;
00172           case MAD_FLOW_BREAK:
00173             goto fail;
00174           case MAD_FLOW_IGNORE:
00175           case MAD_FLOW_CONTINUE:
00176           default:
00177             continue;
00178           }
00179         }
00180 
00181         switch (decoder->header_func(decoder->cb_data, &frame->header)) {
00182         case MAD_FLOW_STOP:
00183           goto done;
00184         case MAD_FLOW_BREAK:
00185           goto fail;
00186         case MAD_FLOW_IGNORE:
00187           continue;
00188         case MAD_FLOW_CONTINUE:
00189           break;
00190         }
00191       }
00192 
00193       if (mad_frame_decode(frame, stream) == -1) {
00194         if (!MAD_RECOVERABLE(stream->error))
00195           break;
00196 
00197         switch (error_func(error_data, stream, frame)) {
00198         case MAD_FLOW_STOP:
00199           goto done;
00200         case MAD_FLOW_BREAK:
00201           goto fail;
00202         case MAD_FLOW_IGNORE:
00203           break;
00204         case MAD_FLOW_CONTINUE:
00205         default:
00206           continue;
00207         }
00208       }
00209       else
00210         bad_last_frame = 0;
00211 
00212       if (decoder->filter_func) {
00213         switch (decoder->filter_func(decoder->cb_data, stream, frame)) {
00214         case MAD_FLOW_STOP:
00215           goto done;
00216         case MAD_FLOW_BREAK:
00217           goto fail;
00218         case MAD_FLOW_IGNORE:
00219           continue;
00220         case MAD_FLOW_CONTINUE:
00221           break;
00222         }
00223       }
00224 
00225       mad_synth_frame(synth, frame);
00226 
00227       if (decoder->output_func) {
00228         switch (decoder->output_func(decoder->cb_data,
00229                                      &frame->header, &synth->pcm)) {
00230         case MAD_FLOW_STOP:
00231           goto done;
00232         case MAD_FLOW_BREAK:
00233           goto fail;
00234         case MAD_FLOW_IGNORE:
00235         case MAD_FLOW_CONTINUE:
00236           break;
00237         }
00238       }
00239     }
00240   }
00241   while (stream->error == MAD_ERROR_BUFLEN);
00242 
00243  fail:
00244   result = -1;
00245 
00246  done:
00247   mad_synth_finish(synth);
00248   mad_frame_finish(frame);
00249   mad_stream_finish(stream);
00250 
00251   return result;
00252 }
00253 
00254 
00255 /*
00256  * NAME:        decoder->run()
00257  * DESCRIPTION: run the decoder thread either synchronously or asynchronously
00258  */
00259 int mad_decoder_run(struct mad_decoder *decoder, enum mad_decoder_mode mode)
00260 {
00261   int result;
00262   int (*run)(struct mad_decoder *) = 0;
00263 
00264   switch (decoder->mode = mode) {
00265   case MAD_DECODER_MODE_SYNC:
00266     run = run_sync;
00267     break;
00268 
00269   case MAD_DECODER_MODE_ASYNC:
00270     break;
00271   }
00272 
00273   if (run == 0)
00274     return -1;
00275   // static struct mad_sync_s sync_mem;
00276   decoder->sync = (struct mad_sync_s *)malloc(sizeof(*decoder->sync));
00277 #if defined(TARGET_LPC1768)  
00278   decoder->sync->synth = (struct mad_synth *)mad_malloc(sizeof(struct mad_synth));
00279 #else
00280   decoder->sync->synth = (struct mad_synth *)malloc(sizeof(struct mad_synth));
00281 #endif
00282   if (decoder->sync == 0)
00283     return -1;
00284 
00285   result = run(decoder);
00286 #if !defined(TARGET_LPC1768)  
00287   free(decoder->sync->synth);
00288 #endif  
00289   free(decoder->sync);
00290   decoder->sync = 0;
00291   reset_ahb_mem();
00292   return result;
00293 }
00294 
00295 /*
00296  * NAME:        decoder->message()
00297  * DESCRIPTION: send a message to and receive a reply from the decoder process
00298  */
00299 int mad_decoder_message(struct mad_decoder *decoder,
00300                         void *message, unsigned int *len)
00301 {
00302   return -1;
00303 }