aacdec.c

   1 /*
   2  * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /*
  20  * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
  21  * Ahead Software AG
  22  */
  23
  24 /** \file aacdec.c paraslash's mp3 decoder */
  25
  26 #include "para.h"
  27
  28 #include "list.h"
  29 #include "filter.h"
  30 #include "error.h"
  31 #include "string.h"
  32 #include "aac.h"
  33
  34 /** the output buffer size */
  35 #define MAX_CHANNELS 6
  36 #define AAC_OUTBUF_SIZE (FAAD_MIN_STREAMSIZE * MAX_CHANNELS)
  37
  38 /**
  39  * data specific to the aacdec filter
  40  *
  41  * \sa filter, filter_node
  42  */
  43 struct private_mp4dec_data {
  44         NeAACDecHandle decoder;
  45         NeAACDecFrameInfo frame_info;
  46
  47         int initialized;
  48         int decoder_length;
  49         long unsigned consumed_total;
  50
  51         long unsigned entry;
  52 };
  53
  54 static ssize_t mp4dec(char *input_buffer, size_t len, struct filter_node *fn)
  55 {
  56         struct private_mp4dec_data *padd = fn->private_data;
  57         struct filter_chain_info *fci = fn->fci;
  58         unsigned long rate = 0;
  59         unsigned char channels = 0;
  60         int i, ret, skip;
  61         unsigned char *p, *outbuffer;
  62         unsigned char *inbuf = (unsigned char*)input_buffer;
  63         size_t consumed = 0;
  64
  65         if (fn->loaded > fn->bufsize * 4 / 5)
  66                 return 0;
  67         if (len < 1000 && !*fci->eof)
  68                 return 0;
  69
  70         if (!padd->initialized) {
  71                 padd->decoder_length = aac_find_esds(inbuf, len, &skip);
  72                 PARA_INFO_LOG("decoder len: %d\n", padd->decoder_length);
  73                 if (padd->decoder_length < 0) {
  74                         ret = NeAACDecInit(padd->decoder, inbuf,
  75                                 len, &rate, &channels);
  76                         PARA_INFO_LOG("decoder init: %d\n", ret);
  77                         if (ret < 0) {
  78                                 ret = -E_AACDEC_INIT;
  79                                 goto out;
  80                         }
  81                         consumed = ret;
  82                 } else {
  83                         consumed += skip;
  84                         p = inbuf + consumed;
  85                         ret = -E_AACDEC_INIT;
  86                         if (NeAACDecInit2(padd->decoder, p,
  87                                         padd->decoder_length, &rate,
  88                                         &channels) < 0)
  89                                 goto out;
  90                 }
  91                 fci->samplerate = rate;
  92                 fci->channels = channels;
  93                 PARA_INFO_LOG("rate: %u, channels: %d\n",
  94                         fci->samplerate, fci->channels);
  95                 padd->initialized = 1;
  96         }
  97         if (padd->decoder_length > 0) {
  98                 consumed = 0;
  99                 if (!padd->entry) {
 100                         ret = aac_find_stco(inbuf + consumed, len - consumed,
 101                                 &skip);
 102                         if (ret < 0) {
 103                                 ret = len;
 104                                 goto out;
 105                         }
 106                         consumed += skip;
 107                         padd->entry = aac_read_int32(inbuf + consumed);
 108                         PARA_INFO_LOG("entry: %lu\n", padd->entry);
 109                 }
 110                 ret = len;
 111                 if (padd->consumed_total + len < padd->entry)
 112                         goto out;
 113                 if (padd->consumed_total < padd->entry)
 114                         consumed = padd->entry - padd->consumed_total;
 115         }
 116         for (; consumed < len;consumed++)
 117                 if ((inbuf[consumed] & 0xfe) == 0x20)
 118                         break;
 119         if (consumed >= len)
 120                 goto success;
 121         p = inbuf + consumed;
 122         outbuffer = NeAACDecDecode(padd->decoder, &padd->frame_info, p,
 123                 len - consumed);
 124         ret = -E_AAC_DECODE;
 125         if (padd->frame_info.error != 0) {
 126                 PARA_ERROR_LOG("frame_error: %d, consumed: %lu + %d + %lu\n",
 127                         padd->frame_info.error, padd->consumed_total,
 128                         consumed, padd->frame_info.bytesconsumed);
 129                 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
 130                         padd->frame_info.error));
 131                 consumed++; /* catch 21 */
 132                 goto success;
 133         }
 134         consumed += padd->frame_info.bytesconsumed;
 135         ret = consumed;
 136         if (!padd->frame_info.samples)
 137                 goto out;
 138         for (i = 0; i < padd->frame_info.samples; i++) {
 139                 short *s = (short *)outbuffer;
 140                 fn->buf[fn->loaded++] = s[i] & 0xff;
 141                 fn->buf[fn->loaded++] = (s[i] >> 8) & 0xff;
 142         }
 143 success:
 144         ret = consumed;
 145 out:
 146         if (ret > 0)
 147                 padd->consumed_total += ret;
 148         return ret;
 149 }
 150
 151 static void mp4dec_open(struct filter_node *fn)
 152 {
 153         fn->private_data = para_calloc(sizeof(struct private_mp4dec_data));
 154         struct private_mp4dec_data *padd = fn->private_data;
 155
 156         fn->bufsize = AAC_OUTBUF_SIZE;
 157         fn->buf = para_calloc(fn->bufsize);
 158         padd->decoder = aac_open();
 159 }
 160
 161 static void mp4dec_close(struct filter_node *fn)
 162 {
 163         struct private_mp4dec_data *padd = fn->private_data;
 164
 165         NeAACDecClose(padd->decoder);
 166         free(fn->buf);
 167         fn->buf = NULL;
 168         free(padd);
 169         fn->private_data = NULL;
 170 }
 171
 172 /**
 173  * the init function of the mp3dec filter
 174  *
 175  * \sa filter::init
 176  */
 177 void aacdec_init(struct filter *f)
 178 {
 179         f->open = mp4dec_open;
 180         f->convert = mp4dec;
 181         f->close = mp4dec_close;
 182 }