aacdec_filter.c

   1 /*
   2  * Copyright (C) 2006-2010 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6 /*
   7  * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
   8  * Ahead Software AG
   9  */
  10
  11 /** \file aacdec_filter.c paraslash's aac (m4a) decoder. */
  12
  13 #include <regex.h>
  14 #include <stdbool.h>
  15
  16 #include "para.h"
  17 #include "list.h"
  18 #include "sched.h"
  19 #include "ggo.h"
  20 #include "buffer_tree.h"
  21 #include "filter.h"
  22 #include "error.h"
  23 #include "string.h"
  24 #include "aac.h"
  25
  26 /** Give up decoding after that many errors. */
  27 #define MAX_ERRORS 20
  28
  29 /**
  30  * data specific to the aacdec filter
  31  *
  32  * \sa filter, filter_node
  33  */
  34 struct private_aacdec_data {
  35         /** the return value of aac_open */
  36         NeAACDecHandle handle;
  37         /** info about the currently decoded frame */
  38         NeAACDecFrameInfo frame_info;
  39         /** whether this instance of the aac decoder is already initialized */
  40         int initialized;
  41         /**
  42          * return value of aac_find_esds(). Used to call the right aacdec
  43          * init function
  44          */
  45         unsigned long decoder_length;
  46         /** number of times the decoder returned an error */
  47         unsigned error_count;
  48         /** number of bytes already consumed from the imput stream */
  49         size_t consumed_total;
  50         /** return value of aac_find_entry_point */
  51         size_t entry;
  52         /** The number of channels of the current stream. */
  53         unsigned int channels;
  54         /** Current sample rate in Hz. */
  55         unsigned int samplerate;
  56 };
  57
  58 static int aacdec_execute(struct btr_node *btrn, const char *cmd, char **result)
  59 {
  60         struct filter_node *fn = btr_context(btrn);
  61         struct private_aacdec_data *padd = fn->private_data;
  62
  63         if (!strcmp(cmd, "samplerate")) {
  64                 if (padd->samplerate == 0)
  65                         return -E_BTR_NAVAIL;
  66                 *result = make_message("%u", padd->samplerate);
  67                 return 1;
  68         }
  69         if (!strcmp(cmd, "channels")) {
  70                 if (padd->channels == 0)
  71                         return -E_BTR_NAVAIL;
  72                 *result = make_message("%u", padd->channels);
  73                 return 1;
  74         }
  75         return -ERRNO_TO_PARA_ERROR(ENOTSUP);
  76 }
  77
  78 static void aacdec_open(struct filter_node *fn)
  79 {
  80         struct private_aacdec_data *padd = para_calloc(sizeof(*padd));
  81
  82         fn->private_data = padd;
  83         fn->min_iqs = 2048;
  84         padd->handle = aac_open();
  85 }
  86
  87 static void aacdec_close(struct filter_node *fn)
  88 {
  89         struct private_aacdec_data *padd = fn->private_data;
  90
  91         NeAACDecClose(padd->handle);
  92         free(padd);
  93         fn->private_data = NULL;
  94 }
  95
  96 static void aacdec_post_select(__a_unused struct sched *s, struct task *t)
  97 {
  98         struct filter_node *fn = container_of(t, struct filter_node, task);
  99         struct btr_node *btrn = fn->btrn;
 100         struct private_aacdec_data *padd = fn->private_data;
 101         int i, ret;
 102         unsigned char *p, *inbuf, *outbuffer;
 103         char *btr_buf;
 104         size_t len, skip, consumed, loaded, iqs;
 105
 106 next_buffer:
 107         t->error = 0;
 108         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 109         if (ret < 0)
 110                 goto err;
 111         if (ret == 0)
 112                 return;
 113         btr_merge(btrn, fn->min_iqs);
 114         len = btr_next_buffer(btrn, (char **)&inbuf);
 115         len = PARA_MAX(len, (size_t)8192);
 116         consumed = 0;
 117         iqs = btr_get_input_queue_size(btrn);
 118         if (!padd->initialized) {
 119                 unsigned long rate = 0;
 120                 unsigned char channels = 0;
 121                 ret = aac_find_esds(inbuf, len, &skip, &padd->decoder_length);
 122                 if (ret < 0) {
 123                         PARA_INFO_LOG("%s\n", para_strerror(-ret));
 124                         ret = NeAACDecInit(padd->handle, inbuf,
 125                                 len, &rate, &channels);
 126                         PARA_INFO_LOG("decoder init: %d\n", ret);
 127                         if (ret < 0) {
 128                                 ret = -E_AACDEC_INIT;
 129                                 goto out;
 130                         }
 131                         consumed = ret;
 132                 } else {
 133                         PARA_INFO_LOG("decoder len: %lu\n",
 134                                 padd->decoder_length);
 135                         consumed += skip;
 136                         p = inbuf + consumed;
 137                         ret = -E_AACDEC_INIT;
 138                         if (NeAACDecInit2(padd->handle, p,
 139                                         padd->decoder_length, &rate,
 140                                         &channels) < 0)
 141                                 goto out;
 142                 }
 143                 padd->samplerate = rate;
 144                 padd->channels = channels;
 145                 PARA_INFO_LOG("rate: %u, channels: %d\n",
 146                         padd->samplerate, padd->channels);
 147                 padd->initialized = 1;
 148         }
 149         if (padd->decoder_length > 0) {
 150                 consumed = 0;
 151                 if (!padd->entry) {
 152                         ret = aac_find_entry_point(inbuf + consumed,
 153                                 len - consumed, &skip);
 154                         if (ret < 0) {
 155                                 ret = len;
 156                                 goto out;
 157                         }
 158                         consumed += skip;
 159                         padd->entry = ret;
 160                         PARA_INFO_LOG("entry: %zu\n", padd->entry);
 161                 }
 162                 ret = len;
 163                 if (padd->consumed_total + len < padd->entry)
 164                         goto out;
 165                 if (padd->consumed_total < padd->entry)
 166                         consumed = padd->entry - padd->consumed_total;
 167         }
 168         for (; consumed < len; consumed++)
 169                 if ((inbuf[consumed] & 0xfe) == 0x20)
 170                         break;
 171         if (consumed >= len)
 172                 goto success;
 173         p = inbuf + consumed;
 174         //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
 175         //      padd->consumed_total, consumed, len - consumed);
 176         outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info, p,
 177                 len - consumed);
 178         if (padd->frame_info.error) {
 179                 int err = padd->frame_info.error;
 180                 ret = -E_AAC_DECODE;
 181                 if (padd->error_count++ > MAX_ERRORS)
 182                         goto err;
 183                 PARA_ERROR_LOG("frame_error: %d (%s), consumed: %zu + %zd + %lu\n",
 184                         err, NeAACDecGetErrorMessage(padd->frame_info.error),
 185                         padd->consumed_total, consumed,
 186                         padd->frame_info.bytesconsumed);
 187                 PARA_ERROR_LOG("%s\n", NeAACDecGetErrorMessage(
 188                         padd->frame_info.error));
 189                 consumed++; /* catch 21 */
 190                 goto success;
 191         }
 192         padd->error_count = 0;
 193         //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
 194         consumed += padd->frame_info.bytesconsumed;
 195         ret = consumed;
 196         if (!padd->frame_info.samples)
 197                 goto out;
 198         btr_buf = para_malloc(2 * padd->frame_info.samples);
 199         loaded = 0;
 200         for (i = 0; i < padd->frame_info.samples; i++) {
 201                 short sh = ((short *)outbuffer)[i];
 202                 write_int16_host_endian(btr_buf + loaded, sh);
 203                 loaded += 2;
 204         }
 205         btr_add_output(btr_buf, loaded, btrn);
 206 success:
 207         ret = consumed;
 208 out:
 209         if (ret >= 0) {
 210                 padd->consumed_total += ret;
 211                 btr_consume(btrn, ret);
 212                 goto next_buffer;
 213         }
 214 err:
 215         assert(ret < 0);
 216         t->error = ret;
 217         btr_remove_node(btrn);
 218 }
 219
 220 /**
 221  * The init function of the aacdec filter.
 222  *
 223  * \param f Pointer to the filter struct to initialize.
 224  *
 225  * \sa filter::init
 226  */
 227 void aacdec_filter_init(struct filter *f)
 228 {
 229         f->open = aacdec_open;
 230         f->close = aacdec_close;
 231         f->pre_select = generic_filter_pre_select;
 232         f->post_select = aacdec_post_select;
 233         f->execute = aacdec_execute;
 234 }