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     retval = CODEC_OK;
  74
  75     /* Wait for the metadata to be read */
  76     if (codec_wait_taginfo() != 0)
  77         goto done;
  78
  79     /* Remember the resume position */
  80     resume_offset = ci->id3->offset;
  81 restart_track:
  82     retval = CODEC_OK;
  83
  84     if (codec_init()) {
  85         LOGF("(WMA Voice) Error: Error initialising codec\n");
  86         retval = CODEC_ERROR;
  87         goto done;
  88     }
  89
  90     /* Copy the format metadata we've stored in the id3 TOC field.  This
  91        saves us from parsing it again here. */
  92     memcpy(&wfx, ci->id3->toc, sizeof(wfx));
  93     memset(&avctx, 0, sizeof(AVCodecContext));
  94     memset(&avpkt, 0, sizeof(AVPacket));
  95
  96     ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate);
  97     ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
  98                   STEREO_MONO : STEREO_INTERLEAVED);
  99     codec_set_replaygain(ci->id3);
 100
 101     /* Initialise the AVCodecContext */
 102     init_codec_ctx(&avctx, &wfx);
 103
 104     if (wmavoice_decode_init(&avctx) < 0) {
 105         LOGF("(WMA Voice) Error: Unsupported or corrupt file\n");
 106         retval = CODEC_ERROR;
 107         goto done;
 108     }
 109
 110     /* Now advance the file position to the first frame */
 111     ci->seek_buffer(ci->id3->first_frame_offset);
 112
 113     elapsedtime = 0;
 114     resume_offset = 0;
 115
 116     /* The main decoding loop */
 117
 118     while (pktcnt < wfx.numpackets)
 119     {
 120         ci->yield();
 121         if (ci->stop_codec || ci->new_track) {
 122             goto done;
 123         }
 124
 125         /* Deal with any pending seek requests */
 126         if (ci->seek_time){
 127
 128             if (ci->seek_time == 1) {
 129                 ci->seek_complete();
 130                 goto restart_track; /* Pretend you never saw this... */
 131             }
 132
 133             elapsedtime = asf_seek(ci->seek_time, &wfx);
 134             if (elapsedtime < 1){
 135                 ci->seek_complete();
 136                 goto next_track;
 137             }
 138
 139             ci->set_elapsed(elapsedtime);
 140             ci->seek_complete();
 141         }
 142
 143 new_packet:
 144         res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
 145
 146         if (res < 0) {
 147             LOGF("(WMA Voice) read_packet error %d\n",res);
 148             goto done;
 149         } else {
 150             avpkt.data = audiobuf;
 151             avpkt.size = audiobufsize;
 152             pktcnt++;
 153
 154             while(avpkt.size > 0)
 155             {
 156                 /* wmavoice_decode_packet checks for the output buffer size to
 157                    avoid overflows */
 158                 outlen = BUFSIZE*sizeof(int32_t);
 159
 160                 res = wmavoice_decode_packet(&avctx, decoded, &outlen, &avpkt);
 161                 if(res < 0) {
 162                     LOGF("(WMA Voice) Error: decode_packet returned %d", res);
 163                     if(res == ERROR_WMAPRO_IN_WMAVOICE){
 164                     /* Just skip this packet */
 165                         ci->advance_buffer(packetlength);
 166                         goto new_packet;
 167                     }
 168                     else
 169                         goto done;
 170                 }
 171                 avpkt.data += res;
 172                 avpkt.size -= res;
 173                 if(outlen) {
 174                     ci->yield ();
 175                     outlen /= sizeof(int32_t);
 176                     ci->pcmbuf_insert(decoded, NULL, outlen);
 177                     elapsedtime += outlen*10/(wfx.rate/100);
 178                     ci->set_elapsed(elapsedtime);
 179                     ci->yield ();
 180                 }
 181             }
 182
 183         }
 184
 185         /* Advance to the next logical packet */
 186         ci->advance_buffer(packetlength);
 187     }
 188
 189 done:
 190     if (ci->request_next_track())
 191         goto next_track;
 192
 193     return retval;
 194 }
 195