apps/codecs/wmapro.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Mohamed Tarek
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "codeclib.h"
  23 #include "libasf/asf.h"
  24 #include "libwmapro/wmaprodec.h"
  25
  26 CODEC_HEADER
  27
  28 static int32_t *dec[2]; /* pointers to the output buffers in WMAProDecodeCtx in
  29                            wmaprodec.c */
  30
  31
  32 /* this is the codec entry point */
  33 enum codec_status codec_main(enum codec_entry_call_reason reason)
  34 {
  35     if (reason == CODEC_LOAD) {
  36         /* Generic codec initialisation */
  37         ci->configure(DSP_SET_SAMPLE_DEPTH, WMAPRO_DSP_SAMPLE_DEPTH);
  38     }
  39
  40     return CODEC_OK;
  41 }
  42
  43 /* this is called for each file to process */
  44 enum codec_status codec_run(void)
  45 {
  46     uint32_t elapsedtime;
  47     asf_waveformatex_t wfx;     /* Holds the stream properties */
  48     int res;                    /* Return values from asf_read_packet() and decode_packet() */
  49     uint8_t* audiobuf;          /* Pointer to the payload of one wma pro packet */
  50     int audiobufsize;           /* Payload size */
  51     int packetlength = 0;       /* Logical packet size (minus the header size) */
  52     int outlen = 0;             /* Number of bytes written to the output buffer */
  53     int pktcnt = 0;             /* Count of the packets played */
  54     uint8_t *data;              /* Pointer to decoder input buffer */
  55     int size;                   /* Size of the input frame to the decoder */
  56     intptr_t param;
  57
  58 restart_track:
  59     if (codec_init()) {
  60         LOGF("(WMA PRO) Error: Error initialising codec\n");
  61         return CODEC_ERROR;
  62     }
  63
  64     /* Copy the format metadata we've stored in the id3 TOC field.  This
  65        saves us from parsing it again here. */
  66     memcpy(&wfx, ci->id3->toc, sizeof(wfx));
  67
  68     ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate);
  69     ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
  70                   STEREO_MONO : STEREO_NONINTERLEAVED);
  71     codec_set_replaygain(ci->id3);
  72
  73     if (decode_init(&wfx) < 0) {
  74         LOGF("(WMA PRO) Error: Unsupported or corrupt file\n");
  75         return CODEC_ERROR;
  76     }
  77
  78     /* Now advance the file position to the first frame */
  79     ci->seek_buffer(ci->id3->first_frame_offset);
  80
  81     elapsedtime = 0;
  82
  83     /* The main decoding loop */
  84
  85     while (pktcnt < wfx.numpackets)
  86     {
  87         enum codec_command_action action = ci->get_command(&param);
  88
  89         if (action == CODEC_ACTION_HALT)
  90             break;
  91
  92         /* Deal with any pending seek requests */
  93         if (action == CODEC_ACTION_SEEK_TIME) {
  94             if (param == 0) {
  95                 ci->set_elapsed(0);
  96                 ci->seek_complete();
  97                 goto restart_track; /* Pretend you never saw this... */
  98             }
  99
 100             elapsedtime = asf_seek(param, &wfx);
 101             if (elapsedtime < 1){
 102                 ci->set_elapsed(0);
 103                 ci->seek_complete();
 104                 break;
 105             }
 106
 107             ci->set_elapsed(elapsedtime);
 108             ci->seek_complete();
 109         }
 110
 111         res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
 112
 113         if (res < 0) {
 114             LOGF("(WMA PRO) Warning: asf_read_packet returned %d", res);
 115             return CODEC_ERROR;
 116         } else {
 117             data = audiobuf;
 118             size = audiobufsize;
 119             pktcnt++;
 120
 121             /* We now loop on the packet, decoding and outputting the subframes
 122              * one-by-one. For more information about how wma pro structures its
 123              * audio frames, see libwmapro/wmaprodec.c */
 124             while(size > 0)
 125             {
 126                 res = decode_packet(&wfx, dec, &outlen, data, size);
 127                 if(res < 0) {
 128                     LOGF("(WMA PRO) Error: decode_packet returned %d", res);
 129                     return CODEC_ERROR;
 130                 }
 131                 data += res;
 132                 size -= res;
 133                 if(outlen) {
 134                     ci->yield ();
 135                     outlen /= (wfx.channels);
 136                     ci->pcmbuf_insert(dec[0], dec[1], outlen );
 137                     elapsedtime += outlen*10/(wfx.rate/100);
 138                     ci->set_elapsed(elapsedtime);
 139                     ci->yield ();
 140                 }
 141             }
 142
 143         }
 144
 145         /* Advance to the next logical packet */
 146         ci->advance_buffer(packetlength);
 147     }
 148
 149     return CODEC_OK;
 150 }
 151