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 /** \file aacdec.c paraslash's mp3 decoder */
  20
  21 #include "para.h"
  22
  23 #include "list.h"
  24 #include "filter.h"
  25 #include "error.h"
  26 #include <mad.h>
  27 #include "string.h"
  28
  29 #include <neaacdec.h>
  30
  31 /** the output buffer size */
  32 #define MAX_CHANNELS 6
  33 #define AAC_OUTBUF_SIZE (FAAD_MIN_STREAMSIZE * MAX_CHANNELS)
  34
  35 /**
  36  * data specific to the aacdec filter
  37  *
  38  * \sa filter, filter_node
  39  */
  40 struct private_mp4dec_data {
  41         NeAACDecHandle decoder;
  42         NeAACDecConfigurationPtr config;
  43         NeAACDecFrameInfo frame_info;
  44         mp4AudioSpecificConfig mp4ASC;
  45
  46         int initialized;
  47         unsigned char *inbuf;
  48         int inbuf_len;
  49         int consumed;
  50         long unsigned consumed_total;
  51
  52         unsigned noffsets;
  53         unsigned *offset;
  54         int offset_pos;
  55 };
  56
  57 static int read_mp4_descr_length(struct private_mp4dec_data *padd)
  58 {
  59         uint8_t b;
  60         uint8_t numBytes = 0;
  61         uint32_t length = 0;
  62
  63         do {
  64                 b = padd->inbuf[padd->consumed + numBytes];
  65                 numBytes++;
  66                 length = (length << 7) | (b & 0x7F);
  67         } while
  68                 ((b & 0x80) && numBytes < 4);
  69         padd->consumed += numBytes;
  70         return length;
  71 }
  72
  73 static int find_esds(struct private_mp4dec_data *padd)
  74 {
  75         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
  76                 unsigned char *p = padd->inbuf + padd->consumed;
  77                 int decoder_length;
  78
  79                 if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
  80                         continue;
  81                 padd->consumed += 8;
  82                 p = padd->inbuf + padd->consumed;
  83                 PARA_INFO_LOG("found esds: %d, next: %x\n", padd->consumed, *p);
  84                 if (*p == 3)
  85                         padd->consumed += 8;
  86                 else
  87                         padd->consumed += 6;
  88                 p = padd->inbuf + padd->consumed;
  89                 PARA_INFO_LOG("next: %x\n", *p);
  90                 if (*p != 4)
  91                         continue;
  92                 padd->consumed += 18;
  93                 p = padd->inbuf + padd->consumed;
  94                 PARA_INFO_LOG("next: %x\n", *p);
  95                 if (*p != 5)
  96                         continue;
  97                 padd->consumed++;
  98                 decoder_length = read_mp4_descr_length(padd);
  99                 PARA_INFO_LOG("decoder length: %d\n", decoder_length);
 100                 p = padd->inbuf + padd->consumed;
 101                 PARA_INFO_LOG("decoder data0: %x\n", *p & 0xff);
 102                 p++;
 103                 PARA_INFO_LOG("decoder data1: %x\n", *p & 0xff);
 104                 return decoder_length;
 105         }
 106         return -E_ESDS;
 107 }
 108
 109 static int read_int32(struct private_mp4dec_data *padd, unsigned *result)
 110 {
 111         uint8_t *d = (uint8_t*)(padd->inbuf + padd->consumed);
 112         if (padd->consumed + 4 > padd->inbuf_len)
 113                 return -1;
 114         padd->consumed += 4;
 115         *result = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
 116         return 1;
 117 }
 118
 119 static int fill_offset_table(struct private_mp4dec_data *padd)
 120 {
 121         int i, ret;
 122
 123         for (i = padd->offset_pos; i < padd->noffsets; i++) {
 124                 ret = read_int32(padd, &padd->offset[i]);
 125                 if (ret < 0)
 126                         return -1;
 127                 PARA_DEBUG_LOG("offset #%d: %d\n", i, padd->offset[i]);
 128                 padd->offset_pos++;
 129         }
 130         return 1;
 131 }
 132
 133 static int find_stco(struct private_mp4dec_data *padd)
 134 {
 135         int ret;
 136
 137         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
 138                 unsigned char *p = padd->inbuf + padd->consumed;
 139
 140                 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
 141                         continue;
 142                 PARA_INFO_LOG("found stco: %d\n", padd->consumed);
 143                 padd->consumed += 8;
 144                 ret = read_int32(padd, &padd->noffsets);
 145                 padd->offset = para_malloc(padd->noffsets * sizeof(int));
 146                 PARA_INFO_LOG("num entries: %d\n", padd->noffsets);
 147                 return 1;
 148         }
 149         return -E_STCO;
 150 }
 151
 152 static ssize_t mp4dec(char *inbuffer, size_t len, struct filter_node *fn)
 153 {
 154         struct private_mp4dec_data *padd = fn->private_data;
 155         struct filter_chain_info *fci = fn->fci;
 156         unsigned long rate = 0;
 157         unsigned char channels = 0;
 158         int i, ret, nbytes;
 159         unsigned char *p, *outbuffer;
 160
 161         if (fn->loaded > fn->bufsize * 4 / 5)
 162                 return 0;
 163         if (len < 1000 && !*fci->eof)
 164                 return 0;
 165         padd->consumed = 0;
 166         padd->inbuf = (unsigned char*)inbuffer;
 167         padd->inbuf_len = len;
 168
 169         if (!padd->initialized) {
 170                 ret = find_esds(padd);
 171                 if (ret < 0)
 172                         goto out;
 173
 174                 p = padd->inbuf + padd->consumed;
 175                 ret = E_AACDEC_INIT;
 176                 if (NeAACDecInit2(padd->decoder, p, ret, &rate, &channels) < 0) {
 177                         PARA_INFO_LOG("header not found, consumed: %d\n",
 178                                 padd->consumed);
 179                         goto out;
 180                 }
 181                 fci->samplerate = rate;
 182                 fci->channels = channels;
 183                 PARA_INFO_LOG("rate: %u, channels: %d\n", fci->samplerate,
 184                         fci->channels);
 185                 padd->initialized = 1;
 186         }
 187         padd->consumed = 0;
 188         if (!padd->offset_pos) {
 189                 ret = len;
 190                 if (find_stco(padd) < 0)
 191                         goto out;
 192         }
 193         if (padd->offset_pos < padd->noffsets) {
 194                 fill_offset_table(padd);
 195                 ret = padd->consumed;
 196                 goto out;
 197         }
 198         PARA_INFO_LOG("consumed total: %lu, first_chunk: %d\n",
 199                 padd->consumed_total, padd->offset[0]);
 200         ret = len;
 201         if (padd->consumed_total + len < padd->offset[0])
 202                 goto out;
 203         if (padd->consumed_total < padd->offset[0])
 204                 padd->consumed = padd->offset[0] - padd->consumed_total;
 205         p = padd->inbuf + padd->consumed;
 206         outbuffer = NeAACDecDecode(padd->decoder, &padd->frame_info, p,
 207                 len - padd->consumed);
 208         PARA_INFO_LOG("frame_error: %d, consumed: %lu + %d + %lu\n",
 209                 padd->frame_info.error, padd->consumed_total,
 210                 padd->consumed, padd->frame_info.bytesconsumed);
 211         ret = -E_AAC_DECODE;
 212         if (padd->frame_info.error != 0) {
 213                 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
 214                         padd->frame_info.error));
 215                 goto out;
 216         }
 217         padd->consumed += padd->frame_info.bytesconsumed;
 218         ret = padd->consumed;
 219         if (!padd->frame_info.samples)
 220                 goto out;
 221         nbytes = padd->frame_info.samples;
 222         for (i = 0; i < padd->frame_info.samples; i++) {
 223                 short *s = (short *)outbuffer;
 224                 fn->buf[fn->loaded++] = s[i] & 0xff;
 225                 fn->buf[fn->loaded++] = (s[i] >> 8) & 0xff;
 226         }
 227         ret = padd->consumed;
 228 out:
 229         if (ret > 0)
 230                 padd->consumed_total += ret;
 231         return ret;
 232 }
 233
 234 static void mp4dec_open(struct filter_node *fn)
 235 {
 236         fn->private_data = para_calloc(sizeof(struct private_mp4dec_data));
 237         struct private_mp4dec_data *padd = fn->private_data;
 238
 239         fn->bufsize = AAC_OUTBUF_SIZE;
 240         fn->buf = para_calloc(fn->bufsize);
 241
 242         padd->decoder = NeAACDecOpen();
 243         padd->config = NeAACDecGetCurrentConfiguration(padd->decoder);
 244         padd->config->defObjectType = LC;
 245         padd->config->outputFormat = FAAD_FMT_16BIT;
 246         padd->config->downMatrix = 0;
 247         NeAACDecSetConfiguration(padd->decoder, padd->config);
 248 }
 249
 250 static void mp4dec_close(struct filter_node *fn)
 251 {
 252         struct private_mp4dec_data *padd = fn->private_data;
 253
 254         NeAACDecClose(padd->decoder);
 255         free(fn->buf);
 256         fn->buf = NULL;
 257         free(padd);
 258         fn->private_data = NULL;
 259 }
 260
 261 /**
 262  * the init function of the mp3dec filter
 263  *
 264  * \sa filter::init
 265  */
 266 void aacdec_init(struct filter *f)
 267 {
 268         f->open = mp4dec_open;
 269         f->convert = mp4dec;
 270         f->close = mp4dec_close;
 271 }