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 int32_t *dec[2]; /* pointers to the output buffers in WMAProDecodeCtx in wmaprodec.c */
  29
  30 /* this is the codec entry point */
  31 enum codec_status codec_main(void)
  32 {
  33     uint32_t elapsedtime;
  34     int retval;
  35     asf_waveformatex_t wfx;     /* Holds the stream properties */
  36     size_t resume_offset;
  37     int res;                    /* Return values from asf_read_packet() and decode_packet() */
  38     uint8_t* audiobuf;          /* Pointer to the payload of one wma pro packet */
  39     int audiobufsize;           /* Payload size */
  40     int packetlength = 0;       /* Logical packet size (minus the header size) */
  41     int outlen = 0;             /* Number of bytes written to the output buffer */
  42     int pktcnt = 0;             /* Count of the packets played */
  43     uint8_t *data;              /* Pointer to decoder input buffer */
  44     int size;                   /* Size of the input frame to the decoder */
  45
  46     /* Generic codec initialisation */
  47     ci->configure(DSP_SET_SAMPLE_DEPTH, WMAPRO_DSP_SAMPLE_DEPTH);
  48
  49
  50 next_track:
  51     retval = CODEC_OK;
  52
  53     /* Wait for the metadata to be read */
  54     if (codec_wait_taginfo() != 0)
  55         goto done;
  56
  57     /* Remember the resume position */
  58     resume_offset = ci->id3->offset;
  59
  60 restart_track:
  61     retval = CODEC_OK;
  62
  63     if (codec_init()) {
  64         LOGF("(WMA PRO) Error: Error initialising codec\n");
  65         retval = CODEC_ERROR;
  66         goto done;
  67     }
  68
  69     /* Copy the format metadata we've stored in the id3 TOC field.  This
  70        saves us from parsing it again here. */
  71     memcpy(&wfx, ci->id3->toc, sizeof(wfx));
  72
  73     ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate);
  74     ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
  75                   STEREO_MONO : STEREO_NONINTERLEAVED);
  76     codec_set_replaygain(ci->id3);
  77
  78     if (decode_init(&wfx) < 0) {
  79         LOGF("(WMA PRO) Error: Unsupported or corrupt file\n");
  80         retval = CODEC_ERROR;
  81         goto done;
  82     }
  83
  84     /* Now advance the file position to the first frame */
  85     ci->seek_buffer(ci->id3->first_frame_offset);
  86
  87     elapsedtime = 0;
  88     resume_offset = 0;
  89
  90     /* The main decoding loop */
  91
  92     while (pktcnt < wfx.numpackets)
  93     {
  94         ci->yield();
  95         if (ci->stop_codec || ci->new_track) {
  96             goto done;
  97         }
  98
  99         /* Deal with any pending seek requests */
 100         if (ci->seek_time){
 101
 102             if (ci->seek_time == 1) {
 103                 ci->seek_complete();
 104                 goto restart_track; /* Pretend you never saw this... */
 105             }
 106
 107             elapsedtime = asf_seek(ci->seek_time, &wfx);
 108             if (elapsedtime < 1){
 109                 ci->seek_complete();
 110                 goto next_track;
 111             }
 112
 113             ci->set_elapsed(elapsedtime);
 114             ci->seek_complete();
 115         }
 116
 117         res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
 118
 119         if (res < 0) {
 120            LOGF("(WMA PRO) Warning: asf_read_packet returned %d", res);
 121            goto done;
 122         } else {
 123             data = audiobuf;
 124             size = audiobufsize;
 125             pktcnt++;
 126
 127             /* We now loop on the packet, decoding and outputting the subframes
 128              * one-by-one. For more information about how wma pro structures its
 129              * audio frames, see libwmapro/wmaprodec.c */
 130             while(size > 0)
 131             {
 132                 res = decode_packet(&wfx, dec, &outlen, data, size);
 133                 if(res < 0) {
 134                     LOGF("(WMA PRO) Error: decode_packet returned %d", res);
 135                     goto done;
 136                 }
 137                 data += res;
 138                 size -= res;
 139                 if(outlen) {
 140                     ci->yield ();
 141                     outlen /= (wfx.channels);
 142                     ci->pcmbuf_insert(dec[0], dec[1], outlen );
 143                     elapsedtime += outlen*10/(wfx.rate/100);
 144                     ci->set_elapsed(elapsedtime);
 145                     ci->yield ();
 146                 }
 147             }
 148
 149         }
 150
 151         /* Advance to the next logical packet */
 152         ci->advance_buffer(packetlength);
 153     }
 154
 155 done:
 156     if (ci->request_next_track())
 157         goto next_track;
 158
 159     return retval;
 160 }
 161