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         char *inbuf;
  48         int inbuf_len;
  49         int consumed;
  50         long unsigned consumed_total;
  51
  52         int noffsets;
  53         int *offset;
  54         int offset_pos;
  55
  56 #if 0
  57         int nsamples;
  58         int *table;
  59         int table_pos;
  60 #endif
  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                 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 #if 0
 126 int fill_table(struct private_mp4dec_data *padd)
 127 {
 128         int i, ret;
 129
 130         for (i = padd->table_pos; i < padd->nsamples; i++) {
 131                 ret = read_int32(padd, &padd->table[i]);
 132                 if (ret < 0)
 133                         return -1;
 134                 PARA_DEBUG_LOG("sample #%d: %d\n", i, padd->table[i]);
 135                 padd->table_pos++;
 136         }
 137         return 1;
 138
 139 }
 140 int find_stsz(struct private_mp4dec_data *padd)
 141 {
 142         int ret;
 143
 144         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
 145                 char *p = padd->inbuf + padd->consumed;
 146
 147                 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
 148                         continue;
 149                 PARA_INFO_LOG("found stsz: %d\n", padd->consumed);
 150                 padd->consumed += 12;
 151                 ret = -E_STSZ;
 152                 if (read_int32(padd, &padd->nsamples) < 0)
 153                         goto out;
 154                 PARA_INFO_LOG("num samples: %d\n", padd->nsamples);
 155                 padd->table = para_malloc(padd->nsamples * sizeof(int));
 156                 return 1;
 157         }
 158         ret = -E_STSZ;
 159 out:
 160         return ret;
 161 }
 162 #endif
 163
 164 static int fill_offset_table(struct private_mp4dec_data *padd)
 165 {
 166         int i, ret;
 167
 168         for (i = padd->offset_pos; i < padd->noffsets; i++) {
 169                 ret = read_int32(padd, &padd->offset[i]);
 170                 if (ret < 0)
 171                         return -1;
 172                 PARA_DEBUG_LOG("offset #%d: %d\n", i, padd->offset[i]);
 173                 padd->offset_pos++;
 174         }
 175         return 1;
 176 }
 177
 178 static int find_stco(struct private_mp4dec_data *padd)
 179 {
 180         int ret;
 181
 182         for (; padd->consumed < padd->inbuf_len; padd->consumed++) {
 183                 char *p = padd->inbuf + padd->consumed;
 184
 185                 if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
 186                         continue;
 187                 PARA_INFO_LOG("found stco: %d\n", padd->consumed);
 188                 padd->consumed += 8;
 189                 ret = read_int32(padd, &padd->noffsets);
 190                 padd->offset = para_malloc(padd->noffsets * sizeof(int));
 191                 PARA_INFO_LOG("num entries: %d\n", padd->noffsets);
 192                 return 1;
 193         }
 194         return -E_STCO;
 195 }
 196
 197 static ssize_t mp4dec(char *inbuffer, size_t len, struct filter_node *fn)
 198 {
 199         struct private_mp4dec_data *padd = fn->private_data;
 200         struct filter_chain_info *fci = fn->fci;
 201         unsigned long rate = 0;
 202         unsigned char channels = 0;
 203         int i, ret, nbytes;
 204         unsigned char *p, *outbuffer;
 205
 206         if (fn->loaded > fn->bufsize * 4 / 5)
 207                 return 0;
 208         if (len < 10 && !*fci->eof)
 209                 return 0;
 210         padd->consumed = 0;
 211         padd->inbuf = inbuffer;
 212         padd->inbuf_len = len;
 213
 214         if (!padd->initialized) {
 215                 ret = find_esds(padd);
 216                 if (ret < 0)
 217                         goto out;
 218
 219                 p = inbuffer + padd->consumed;
 220                 ret = E_AACDEC_INIT;
 221                 if (NeAACDecInit2(padd->decoder, p, ret, &rate, &channels) < 0) {
 222                         PARA_INFO_LOG("header not found, consumed: %d\n",
 223                                 padd->consumed);
 224                         goto out;
 225                 }
 226                 fci->samplerate = rate;
 227                 fci->channels = channels;
 228                 PARA_INFO_LOG("rate: %u, channels: %d\n", fci->samplerate,
 229                         fci->channels);
 230                 padd->initialized = 1;
 231         }
 232         padd->consumed = 0;
 233 #if 0
 234         if (!padd->table_pos) {
 235                 ret = find_stsz(padd);
 236                 if (ret < 0)
 237                         goto out;
 238         }
 239         if (padd->table_pos < padd->nsamples) {
 240                 fill_table(padd);
 241                 ret = padd->consumed;
 242                 goto out;
 243         }
 244 #endif
 245         if (!padd->offset_pos) {
 246 //              ret = find_stco(padd);
 247 //              if (ret < 0)
 248 //                      goto out;
 249                 ret = len;
 250                 if (find_stco(padd) < 0)
 251                         goto out;
 252         }
 253         if (padd->offset_pos < padd->noffsets) {
 254                 fill_offset_table(padd);
 255                 ret = padd->consumed;
 256                 goto out;
 257         }
 258         PARA_INFO_LOG("consumed total: %lu, first_chunk: %d\n",
 259                 padd->consumed_total, padd->offset[0]);
 260         ret = len;
 261         if (padd->consumed_total + len < padd->offset[0])
 262                 goto out;
 263         if (padd->consumed_total < padd->offset[0])
 264                 padd->consumed = padd->offset[0] - padd->consumed_total;
 265         p = padd->inbuf + padd->consumed;
 266         outbuffer = NeAACDecDecode(padd->decoder, &padd->frame_info, p,
 267                 len - padd->consumed);
 268         PARA_INFO_LOG("frame_error: %d, consumed: %lu + %d + %lu\n",
 269                 padd->frame_info.error, padd->consumed_total,
 270                 padd->consumed, padd->frame_info.bytesconsumed);
 271         ret = -E_AAC_DECODE;
 272         if (padd->frame_info.error != 0) {
 273                 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
 274                         padd->frame_info.error));
 275                 goto out;
 276         }
 277         padd->consumed += padd->frame_info.bytesconsumed;
 278         ret = padd->consumed;
 279         if (!padd->frame_info.samples)
 280                 goto out;
 281         nbytes = padd->frame_info.samples;
 282         for (i = 0; i < padd->frame_info.samples; i++) {
 283                 short *s = (short *)outbuffer;
 284                 fn->buf[fn->loaded++] = s[i] & 0xff;
 285                 fn->buf[fn->loaded++] = (s[i] >> 8) & 0xff;
 286         }
 287         ret = padd->consumed;
 288 out:
 289         if (ret > 0)
 290                 padd->consumed_total += ret;
 291         return ret;
 292 }
 293
 294 static void mp4dec_open(struct filter_node *fn)
 295 {
 296         fn->private_data = para_calloc(sizeof(struct private_mp4dec_data));
 297         struct private_mp4dec_data *padd = fn->private_data;
 298
 299         fn->bufsize = AAC_OUTBUF_SIZE;
 300         fn->buf = para_calloc(fn->bufsize);
 301
 302         padd->decoder = NeAACDecOpen();
 303         padd->config = NeAACDecGetCurrentConfiguration(padd->decoder);
 304         padd->config->defObjectType = LC;
 305         padd->config->outputFormat = FAAD_FMT_16BIT;
 306         padd->config->downMatrix = 0;
 307         NeAACDecSetConfiguration(padd->decoder, padd->config);
 308 }
 309
 310 static void mp4dec_close(struct filter_node *fn)
 311 {
 312         struct private_mp4dec_data *padd = fn->private_data;
 313
 314         NeAACDecClose(padd->decoder);
 315         free(fn->buf);
 316         fn->buf = NULL;
 317         free(padd);
 318         fn->private_data = NULL;
 319 }
 320
 321 /**
 322  * the init function of the mp3dec filter
 323  *
 324  * \sa filter::init
 325  */
 326 void aacdec_init(struct filter *f)
 327 {
 328         f->open = mp4dec_open;
 329         f->convert = mp4dec;
 330         f->close = mp4dec_close;
 331 }