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         int decoder_length;
  53         unsigned char *inbuf;
  54         int inbuf_len;
  55         int consumed;
  56         long unsigned consumed_total;
  57
  58         unsigned noffsets;
  59         unsigned *offset;
  60         int offset_pos;
  61 };
  62
  63 static int read_mp4_descr_length(struct private_mp4dec_data *padd)
  64 {
  65         uint8_t b;
  66         uint8_t numBytes = 0;
  67         uint32_t length = 0;
  68
  69         do {
  70                 b = padd->inbuf[padd->consumed + numBytes];
  71                 numBytes++;
  72                 length = (length << 7) | (b & 0x7F);
  73         } while
  74                 ((b & 0x80) && numBytes < 4);
  75         padd->consumed += numBytes;
  76         return length;
  77 }
  78
  79 static int find_esds(struct private_mp4dec_data *padd)
  80 {
  81         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
  82                 unsigned char *p = padd->inbuf + padd->consumed;
  83                 int decoder_length;
  84
  85                 if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
  86                         continue;
  87                 padd->consumed += 8;
  88                 p = padd->inbuf + padd->consumed;
  89                 PARA_INFO_LOG("found esds: %d, next: %x\n", padd->consumed, *p);
  90                 if (*p == 3)
  91                         padd->consumed += 8;
  92                 else
  93                         padd->consumed += 6;
  94                 p = padd->inbuf + padd->consumed;
  95                 PARA_INFO_LOG("next: %x\n", *p);
  96                 if (*p != 4)
  97                         continue;
  98                 padd->consumed += 18;
  99                 p = padd->inbuf + padd->consumed;
 100                 PARA_INFO_LOG("next: %x\n", *p);
 101                 if (*p != 5)
 102                         continue;
 103                 padd->consumed++;
 104                 decoder_length = read_mp4_descr_length(padd);
 105                 PARA_INFO_LOG("decoder length: %d\n", decoder_length);
 106                 p = padd->inbuf + padd->consumed;
 107                 PARA_INFO_LOG("decoder data0: %x\n", *p & 0xff);
 108                 p++;
 109                 PARA_INFO_LOG("decoder data1: %x\n", *p & 0xff);
 110                 return decoder_length;
 111         }
 112         return -E_ESDS;
 113 }
 114
 115 static int read_int32(struct private_mp4dec_data *padd, unsigned *result)
 116 {
 117         uint8_t *d = (uint8_t*)(padd->inbuf + padd->consumed);
 118         if (padd->consumed + 4 > padd->inbuf_len)
 119                 return -1;
 120         padd->consumed += 4;
 121         *result = (d[0] << 24) | (d[1] << 16) | (d[2] << 8) | d[3];
 122         return 1;
 123 }
 124
 125 static int fill_offset_table(struct private_mp4dec_data *padd)
 126 {
 127         int i, ret;
 128
 129         for (i = padd->offset_pos; i < padd->noffsets; i++) {
 130                 ret = read_int32(padd, &padd->offset[i]);
 131                 if (ret < 0)
 132                         return -1;
 133                 PARA_DEBUG_LOG("offset #%d: %d\n", i, padd->offset[i]);
 134                 padd->offset_pos++;
 135         }
 136         return 1;
 137 }
 138
 139 static int find_stco(struct private_mp4dec_data *padd)
 140 {
 141         int ret;
 142
 143         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
 144                 unsigned char *p = padd->inbuf + padd->consumed;
 145
 146                 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
 147                         continue;
 148                 PARA_INFO_LOG("found stco: %d\n", padd->consumed);
 149                 padd->consumed += 8;
 150                 ret = read_int32(padd, &padd->noffsets);
 151                 padd->offset = para_malloc(padd->noffsets * sizeof(int));
 152                 PARA_INFO_LOG("num entries: %d\n", padd->noffsets);
 153                 return 1;
 154         }
 155         return -E_STCO;
 156 }
 157
 158 static ssize_t mp4dec(char *inbuffer, size_t len, struct filter_node *fn)
 159 {
 160         struct private_mp4dec_data *padd = fn->private_data;
 161         struct filter_chain_info *fci = fn->fci;
 162         unsigned long rate = 0;
 163         unsigned char channels = 0;
 164         int i, ret, nbytes;
 165         unsigned char *p, *outbuffer;
 166
 167         if (fn->loaded > fn->bufsize * 4 / 5)
 168                 return 0;
 169         if (len < 1000 && !*fci->eof)
 170                 return 0;
 171         padd->consumed = 0;
 172         padd->inbuf = (unsigned char*)inbuffer;
 173         padd->inbuf_len = len;
 174
 175         if (!padd->initialized) {
 176                 padd->decoder_length = find_esds(padd);
 177                 if (padd->decoder_length < 0) {
 178                         ret = NeAACDecInit(padd->decoder, padd->inbuf,
 179                                 padd->inbuf_len, &rate, &channels);
 180                         if (ret < 0) {
 181                                 ret = E_AACDEC_INIT;
 182                                 goto out;
 183                         }
 184                         padd->consumed = ret;
 185                 } else {
 186                         p = padd->inbuf + padd->consumed;
 187                         ret = E_AACDEC_INIT;
 188                         if (NeAACDecInit2(padd->decoder, p,
 189                                         padd->decoder_length, &rate,
 190                                         &channels) < 0)
 191                                 goto out;
 192                 }
 193                 fci->samplerate = rate;
 194                 fci->channels = channels;
 195                 PARA_INFO_LOG("rate: %u, channels: %d\n", fci->samplerate,
 196                         fci->channels);
 197                 padd->initialized = 1;
 198         }
 199         if (padd->decoder_length > 0) {
 200                 padd->consumed = 0;
 201                 if (!padd->offset_pos) {
 202                         ret = len;
 203                         if (find_stco(padd) < 0)
 204                                 goto out;
 205                 }
 206                 if (padd->offset_pos < padd->noffsets) {
 207                         fill_offset_table(padd);
 208                         ret = padd->consumed;
 209                         goto out;
 210                 }
 211 //              PARA_INFO_LOG("consumed total: %lu, first_chunk: %d\n",
 212 //                      padd->consumed_total, padd->offset[0]);
 213                 ret = len;
 214                 if (padd->consumed_total + len < padd->offset[0])
 215                         goto out;
 216                 if (padd->consumed_total < padd->offset[0])
 217                         padd->consumed = padd->offset[0] - padd->consumed_total;
 218         }
 219         for (; padd->consumed < padd->inbuf_len; padd->consumed++)
 220                 if ((padd->inbuf[padd->consumed] & 0xfe) == 0x20)
 221                         break;
 222         if (padd->consumed >= padd->inbuf_len)
 223                 goto success;
 224         p = padd->inbuf + padd->consumed;
 225 //      PARA_NOTICE_LOG("p[0]: %lx\n", (long unsigned) *p);
 226         outbuffer = NeAACDecDecode(padd->decoder, &padd->frame_info, p,
 227                 len - padd->consumed);
 228         ret = -E_AAC_DECODE;
 229         if (padd->frame_info.error != 0) {
 230                 PARA_ERROR_LOG("frame_error: %d, consumed: %lu + %d + %lu\n",
 231                         padd->frame_info.error, padd->consumed_total,
 232                         padd->consumed, padd->frame_info.bytesconsumed);
 233                 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
 234                         padd->frame_info.error));
 235                 padd->consumed++; /* catch 21 */
 236                 goto success;
 237         }
 238         padd->consumed += padd->frame_info.bytesconsumed;
 239         ret = padd->consumed;
 240         if (!padd->frame_info.samples)
 241                 goto out;
 242         nbytes = padd->frame_info.samples;
 243         for (i = 0; i < padd->frame_info.samples; i++) {
 244                 short *s = (short *)outbuffer;
 245                 fn->buf[fn->loaded++] = s[i] & 0xff;
 246                 fn->buf[fn->loaded++] = (s[i] >> 8) & 0xff;
 247         }
 248 success:
 249         ret = padd->consumed;
 250 out:
 251         if (ret > 0)
 252                 padd->consumed_total += ret;
 253         return ret;
 254 }
 255
 256 static void mp4dec_open(struct filter_node *fn)
 257 {
 258         fn->private_data = para_calloc(sizeof(struct private_mp4dec_data));
 259         struct private_mp4dec_data *padd = fn->private_data;
 260
 261         fn->bufsize = AAC_OUTBUF_SIZE;
 262         fn->buf = para_calloc(fn->bufsize);
 263
 264         padd->decoder = NeAACDecOpen();
 265         padd->config = NeAACDecGetCurrentConfiguration(padd->decoder);
 266         padd->config->defObjectType = LC;
 267         padd->config->outputFormat = FAAD_FMT_16BIT;
 268         padd->config->downMatrix = 0;
 269         NeAACDecSetConfiguration(padd->decoder, padd->config);
 270 }
 271
 272 static void mp4dec_close(struct filter_node *fn)
 273 {
 274         struct private_mp4dec_data *padd = fn->private_data;
 275
 276         NeAACDecClose(padd->decoder);
 277         free(fn->buf);
 278         fn->buf = NULL;
 279         free(padd);
 280         fn->private_data = NULL;
 281 }
 282
 283 /**
 284  * the init function of the mp3dec filter
 285  *
 286  * \sa filter::init
 287  */
 288 void aacdec_init(struct filter *f)
 289 {
 290         f->open = mp4dec_open;
 291         f->convert = mp4dec;
 292         f->close = mp4dec_close;
 293 }