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 <mad.h>
  32 #include "string.h"
  33
  34 #include <neaacdec.h>
  35
  36 /** the output buffer size */
  37 #define MAX_CHANNELS 6
  38 #define AAC_OUTBUF_SIZE (FAAD_MIN_STREAMSIZE * MAX_CHANNELS)
  39
  40 /**
  41  * data specific to the aacdec filter
  42  *
  43  * \sa filter, filter_node
  44  */
  45 struct private_mp4dec_data {
  46         NeAACDecHandle decoder;
  47         NeAACDecConfigurationPtr config;
  48         NeAACDecFrameInfo frame_info;
  49         mp4AudioSpecificConfig mp4ASC;
  50
  51         int initialized;
  52         unsigned char *inbuf;
  53         int inbuf_len;
  54         int consumed;
  55         long unsigned consumed_total;
  56
  57         unsigned noffsets;
  58         unsigned *offset;
  59         int offset_pos;
  60 };
  61
  62 static int read_mp4_descr_length(struct private_mp4dec_data *padd)
  63 {
  64         uint8_t b;
  65         uint8_t numBytes = 0;
  66         uint32_t length = 0;
  67
  68         do {
  69                 b = padd->inbuf[padd->consumed + numBytes];
  70                 numBytes++;
  71                 length = (length << 7) | (b & 0x7F);
  72         } while
  73                 ((b & 0x80) && numBytes < 4);
  74         padd->consumed += numBytes;
  75         return length;
  76 }
  77
  78 static int find_esds(struct private_mp4dec_data *padd)
  79 {
  80         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
  81                 unsigned char *p = padd->inbuf + padd->consumed;
  82                 int decoder_length;
  83
  84                 if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
  85                         continue;
  86                 padd->consumed += 8;
  87                 p = padd->inbuf + padd->consumed;
  88                 PARA_INFO_LOG("found esds: %d, next: %x\n", padd->consumed, *p);
  89                 if (*p == 3)
  90                         padd->consumed += 8;
  91                 else
  92                         padd->consumed += 6;
  93                 p = padd->inbuf + padd->consumed;
  94                 PARA_INFO_LOG("next: %x\n", *p);
  95                 if (*p != 4)
  96                         continue;
  97                 padd->consumed += 18;
  98                 p = padd->inbuf + padd->consumed;
  99                 PARA_INFO_LOG("next: %x\n", *p);
 100                 if (*p != 5)
 101                         continue;
 102                 padd->consumed++;
 103                 decoder_length = read_mp4_descr_length(padd);
 104                 PARA_INFO_LOG("decoder length: %d\n", decoder_length);
 105                 p = padd->inbuf + padd->consumed;
 106                 PARA_INFO_LOG("decoder data0: %x\n", *p & 0xff);
 107                 p++;
 108                 PARA_INFO_LOG("decoder data1: %x\n", *p & 0xff);
 109                 return decoder_length;
 110         }
 111         return -E_ESDS;
 112 }
 113
 114 static int read_int32(struct private_mp4dec_data *padd, unsigned *result)
 115 {
 116         uint8_t *d = (uint8_t*)(padd->inbuf + padd->consumed);
 117         if (padd->consumed + 4 > padd->inbuf_len)
 118                 return -1;
 119         padd->consumed += 4;
 120         *result = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
 121         return 1;
 122 }
 123
 124 static int fill_offset_table(struct private_mp4dec_data *padd)
 125 {
 126         int i, ret;
 127
 128         for (i = padd->offset_pos; i < padd->noffsets; i++) {
 129                 ret = read_int32(padd, &padd->offset[i]);
 130                 if (ret < 0)
 131                         return -1;
 132                 PARA_DEBUG_LOG("offset #%d: %d\n", i, padd->offset[i]);
 133                 padd->offset_pos++;
 134         }
 135         return 1;
 136 }
 137
 138 static int find_stco(struct private_mp4dec_data *padd)
 139 {
 140         int ret;
 141
 142         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
 143                 unsigned char *p = padd->inbuf + padd->consumed;
 144
 145                 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
 146                         continue;
 147                 PARA_INFO_LOG("found stco: %d\n", padd->consumed);
 148                 padd->consumed += 8;
 149                 ret = read_int32(padd, &padd->noffsets);
 150                 padd->offset = para_malloc(padd->noffsets * sizeof(int));
 151                 PARA_INFO_LOG("num entries: %d\n", padd->noffsets);
 152                 return 1;
 153         }
 154         return -E_STCO;
 155 }
 156
 157 static ssize_t mp4dec(char *inbuffer, size_t len, struct filter_node *fn)
 158 {
 159         struct private_mp4dec_data *padd = fn->private_data;
 160         struct filter_chain_info *fci = fn->fci;
 161         unsigned long rate = 0;
 162         unsigned char channels = 0;
 163         int i, ret, nbytes;
 164         unsigned char *p, *outbuffer;
 165
 166         if (fn->loaded > fn->bufsize * 4 / 5)
 167                 return 0;
 168         if (len < 1000 && !*fci->eof)
 169                 return 0;
 170         padd->consumed = 0;
 171         padd->inbuf = (unsigned char*)inbuffer;
 172         padd->inbuf_len = len;
 173
 174         if (!padd->initialized) {
 175                 ret = find_esds(padd);
 176                 if (ret < 0)
 177                         goto out;
 178
 179                 p = padd->inbuf + padd->consumed;
 180                 ret = E_AACDEC_INIT;
 181                 if (NeAACDecInit2(padd->decoder, p, ret, &rate, &channels) < 0) {
 182                         PARA_INFO_LOG("header not found, consumed: %d\n",
 183                                 padd->consumed);
 184                         goto out;
 185                 }
 186                 fci->samplerate = rate;
 187                 fci->channels = channels;
 188                 PARA_INFO_LOG("rate: %u, channels: %d\n", fci->samplerate,
 189                         fci->channels);
 190                 padd->initialized = 1;
 191         }
 192         padd->consumed = 0;
 193         if (!padd->offset_pos) {
 194                 ret = len;
 195                 if (find_stco(padd) < 0)
 196                         goto out;
 197         }
 198         if (padd->offset_pos < padd->noffsets) {
 199                 fill_offset_table(padd);
 200                 ret = padd->consumed;
 201                 goto out;
 202         }
 203         PARA_INFO_LOG("consumed total: %lu, first_chunk: %d\n",
 204                 padd->consumed_total, padd->offset[0]);
 205         ret = len;
 206         if (padd->consumed_total + len < padd->offset[0])
 207                 goto out;
 208         if (padd->consumed_total < padd->offset[0])
 209                 padd->consumed = padd->offset[0] - padd->consumed_total;
 210         p = padd->inbuf + padd->consumed;
 211         outbuffer = NeAACDecDecode(padd->decoder, &padd->frame_info, p,
 212                 len - padd->consumed);
 213         PARA_INFO_LOG("frame_error: %d, consumed: %lu + %d + %lu\n",
 214                 padd->frame_info.error, padd->consumed_total,
 215                 padd->consumed, padd->frame_info.bytesconsumed);
 216         ret = -E_AAC_DECODE;
 217         if (padd->frame_info.error != 0) {
 218                 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
 219                         padd->frame_info.error));
 220                 goto out;
 221         }
 222         padd->consumed += padd->frame_info.bytesconsumed;
 223         ret = padd->consumed;
 224         if (!padd->frame_info.samples)
 225                 goto out;
 226         nbytes = padd->frame_info.samples;
 227         for (i = 0; i < padd->frame_info.samples; i++) {
 228                 short *s = (short *)outbuffer;
 229                 fn->buf[fn->loaded++] = s[i] & 0xff;
 230                 fn->buf[fn->loaded++] = (s[i] >> 8) & 0xff;
 231         }
 232         ret = padd->consumed;
 233 out:
 234         if (ret > 0)
 235                 padd->consumed_total += ret;
 236         return ret;
 237 }
 238
 239 static void mp4dec_open(struct filter_node *fn)
 240 {
 241         fn->private_data = para_calloc(sizeof(struct private_mp4dec_data));
 242         struct private_mp4dec_data *padd = fn->private_data;
 243
 244         fn->bufsize = AAC_OUTBUF_SIZE;
 245         fn->buf = para_calloc(fn->bufsize);
 246
 247         padd->decoder = NeAACDecOpen();
 248         padd->config = NeAACDecGetCurrentConfiguration(padd->decoder);
 249         padd->config->defObjectType = LC;
 250         padd->config->outputFormat = FAAD_FMT_16BIT;
 251         padd->config->downMatrix = 0;
 252         NeAACDecSetConfiguration(padd->decoder, padd->config);
 253 }
 254
 255 static void mp4dec_close(struct filter_node *fn)
 256 {
 257         struct private_mp4dec_data *padd = fn->private_data;
 258
 259         NeAACDecClose(padd->decoder);
 260         free(fn->buf);
 261         fn->buf = NULL;
 262         free(padd);
 263         fn->private_data = NULL;
 264 }
 265
 266 /**
 267  * the init function of the mp3dec filter
 268  *
 269  * \sa filter::init
 270  */
 271 void aacdec_init(struct filter *f)
 272 {
 273         f->open = mp4dec_open;
 274         f->convert = mp4dec;
 275         f->close = mp4dec_close;
 276 }