apps/codecs/wmavoice.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 "libwmavoice/wmavoice.h"
  25
  26 CODEC_HEADER
  27
  28 static AVCodecContext avctx;
  29 static AVPacket avpkt;
  30
  31 #define MAX_FRAMES           3   /*maximum number of frames per superframe*/
  32 #define MAX_FRAMESIZE        160 /* maximum number of samples per frame */
  33 #define BUFSIZE              MAX_FRAMES*MAX_FRAMESIZE
  34 static int32_t decoded[BUFSIZE] IBSS_ATTR;
  35
  36
  37 /* This function initialises AVCodecContext with the data needed for the wmapro
  38  * decoder to work. The required data is taken from asf_waveformatex_t because that's
  39  * what the rockbox asf metadata parser fill/work with. In the future, when the
  40  * codec is being optimised for on-target playback this function should not be needed. */
  41 static void init_codec_ctx(AVCodecContext *avctx, asf_waveformatex_t *wfx)
  42 {
  43     /* Copy the extra-data */
  44     avctx->extradata_size = wfx->datalen;
  45     avctx->extradata = (uint8_t *)malloc(wfx->datalen*sizeof(uint8_t));
  46     memcpy(avctx->extradata, wfx->data, wfx->datalen*sizeof(uint8_t));
  47
  48     avctx->block_align = wfx->blockalign;
  49     avctx->sample_rate = wfx->rate;
  50     avctx->channels    = wfx->channels;
  51
  52 }
  53
  54 /* this is the codec entry point */
  55 enum codec_status codec_main(void)
  56 {
  57     uint32_t elapsedtime;
  58     int retval;
  59     asf_waveformatex_t wfx;     /* Holds the stream properties */
  60     size_t resume_offset;
  61     int res;                    /* Return values from asf_read_packet() and decode_packet() */
  62     uint8_t* audiobuf;          /* Pointer to the payload of one wma pro packet */
  63     int audiobufsize;           /* Payload size */
  64     int packetlength = 0;       /* Logical packet size (minus the header size) */
  65     int outlen = 0;             /* Number of bytes written to the output buffer */
  66     int pktcnt = 0;             /* Count of the packets played */
  67
  68     /* Generic codec initialisation */
  69     ci->configure(DSP_SET_SAMPLE_DEPTH, 31);
  70
  71
  72 next_track:
  73
  74     /* Wait for the metadata to be read */
  75     while (!*ci->taginfo_ready && !ci->stop_codec)
  76         ci->sleep(1);
  77
  78     retval = CODEC_OK;
  79
  80     /* Remember the resume position */
  81     resume_offset = ci->id3->offset;
  82  restart_track:
  83     if (codec_init()) {
  84         LOGF("(WMA Voice) Error: Error initialising codec\n");
  85         retval = CODEC_ERROR;
  86         goto done;
  87     }
  88
  89     /* Copy the format metadata we've stored in the id3 TOC field.  This
  90        saves us from parsing it again here. */
  91     memcpy(&wfx, ci->id3->toc, sizeof(wfx));
  92     memset(&avctx, 0, sizeof(AVCodecContext));
  93     memset(&avpkt, 0, sizeof(AVPacket));
  94
  95     ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate);
  96     ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
  97                   STEREO_MONO : STEREO_INTERLEAVED);
  98     codec_set_replaygain(ci->id3);
  99
 100     /* Initialise the AVCodecContext */
 101     init_codec_ctx(&avctx, &wfx);
 102
 103     if (wmavoice_decode_init(&avctx) < 0) {
 104         LOGF("(WMA Voice) Error: Unsupported or corrupt file\n");
 105         retval = CODEC_ERROR;
 106         goto done;
 107     }
 108
 109     /* Now advance the file position to the first frame */
 110     ci->seek_buffer(ci->id3->first_frame_offset);
 111
 112     elapsedtime = 0;
 113     resume_offset = 0;
 114
 115     /* The main decoding loop */
 116
 117     while (pktcnt < wfx.numpackets)
 118     {
 119         ci->yield();
 120         if (ci->stop_codec || ci->new_track) {
 121             goto done;
 122         }
 123
 124         /* Deal with any pending seek requests */
 125         if (ci->seek_time){
 126
 127             if (ci->seek_time == 1) {
 128                 ci->seek_complete();
 129                 goto restart_track; /* Pretend you never saw this... */
 130             }
 131
 132             elapsedtime = asf_seek(ci->seek_time, &wfx);
 133             if (elapsedtime < 1){
 134                 ci->seek_complete();
 135                 goto next_track;
 136             }
 137
 138             ci->set_elapsed(elapsedtime);
 139             ci->seek_complete();
 140         }
 141
 142 new_packet:
 143         res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
 144
 145         if (res < 0) {
 146             LOGF("(WMA Voice) read_packet error %d\n",res);
 147             goto done;
 148         } else {
 149             avpkt.data = audiobuf;
 150             avpkt.size = audiobufsize;
 151             pktcnt++;
 152
 153             while(avpkt.size > 0)
 154             {
 155                 /* wmavoice_decode_packet checks for the output buffer size to
 156                    avoid overflows */
 157                 outlen = BUFSIZE*sizeof(int32_t);
 158
 159                 res = wmavoice_decode_packet(&avctx, decoded, &outlen, &avpkt);
 160                 if(res < 0) {
 161                     LOGF("(WMA Voice) Error: decode_packet returned %d", res);
 162                     if(res == ERROR_WMAPRO_IN_WMAVOICE){
 163                     /* Just skip this packet */
 164                         ci->advance_buffer(packetlength);
 165                         goto new_packet;
 166                     }
 167                     else
 168                         goto done;
 169                 }
 170                 avpkt.data += res;
 171                 avpkt.size -= res;
 172                 if(outlen) {
 173                     ci->yield ();
 174                     outlen /= sizeof(int32_t);
 175                     ci->pcmbuf_insert(decoded, NULL, outlen);
 176                     elapsedtime += outlen*10/(wfx.rate/100);
 177                     ci->set_elapsed(elapsedtime);
 178                     ci->yield ();
 179                 }
 180             }
 181
 182         }
 183
 184         /* Advance to the next logical packet */
 185         ci->advance_buffer(packetlength);
 186     }
 187     retval = CODEC_OK;
 188
 189 done:
 190     if (ci->request_next_track())
 191         goto next_track;
 192
 193     return retval;
 194 }
 195