aacdec_filter.c

   1 /*
   2  * Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>
   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 <neaacdec.h>
  15
  16 #include "para.h"
  17 #include "portable_io.h"
  18 #include "list.h"
  19 #include "sched.h"
  20 #include "ggo.h"
  21 #include "buffer_tree.h"
  22 #include "filter.h"
  23 #include "error.h"
  24 #include "string.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         /** number of times the decoder returned an error */
  42         unsigned error_count;
  43         /** number of bytes already consumed from the imput stream */
  44         size_t consumed_total;
  45         /** The number of channels of the current stream. */
  46         unsigned int channels;
  47         /** Current sample rate in Hz. */
  48         unsigned int sample_rate;
  49 };
  50
  51 /*
  52  * Get a new libfaad decoder handle.
  53  *
  54  * \return The handle returned by NeAACDecOpen().
  55  */
  56 static NeAACDecHandle aac_open(void)
  57 {
  58         NeAACDecHandle h = NeAACDecOpen();
  59         NeAACDecConfigurationPtr c = NeAACDecGetCurrentConfiguration(h);
  60
  61         c->defObjectType = LC;
  62         c->outputFormat = FAAD_FMT_16BIT;
  63         c->downMatrix = 0;
  64         NeAACDecSetConfiguration(h, c);
  65         return h;
  66 }
  67
  68 static int aacdec_execute(struct btr_node *btrn, const char *cmd, char **result)
  69 {
  70         struct filter_node *fn = btr_context(btrn);
  71         struct private_aacdec_data *padd = fn->private_data;
  72
  73         return decoder_execute(cmd, padd->sample_rate, padd->channels, result);
  74 }
  75
  76 static void aacdec_open(struct filter_node *fn)
  77 {
  78         struct private_aacdec_data *padd = para_calloc(sizeof(*padd));
  79
  80         fn->private_data = padd;
  81         fn->min_iqs = 2048;
  82         padd->handle = aac_open();
  83 }
  84
  85 static void aacdec_close(struct filter_node *fn)
  86 {
  87         struct private_aacdec_data *padd = fn->private_data;
  88
  89         NeAACDecClose(padd->handle);
  90         free(padd);
  91         fn->private_data = NULL;
  92 }
  93
  94 static int aacdec_post_select(__a_unused struct sched *s, void *context)
  95 {
  96         struct filter_node *fn = context;
  97         struct btr_node *btrn = fn->btrn;
  98         struct private_aacdec_data *padd = fn->private_data;
  99         int i, ret;
 100         char *inbuf, *outbuf, *btrbuf;
 101         size_t len, consumed, loaded;
 102
 103 next_buffer:
 104         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 105         if (ret < 0)
 106                 goto err;
 107         if (ret == 0)
 108                 return 0;
 109         btr_merge(btrn, fn->min_iqs);
 110         len = btr_next_buffer(btrn, &inbuf);
 111         len = PARA_MIN(len, (size_t)8192);
 112         consumed = 0;
 113         if (!padd->initialized) {
 114                 unsigned long rate = 0;
 115                 unsigned char channels = 0;
 116                 ret = NeAACDecInit(padd->handle, (unsigned char *)inbuf,
 117                         len, &rate, &channels);
 118                 PARA_INFO_LOG("decoder init: %d\n", ret);
 119                 if (ret < 0) {
 120                         ret = -E_AACDEC_INIT;
 121                         goto err;
 122                 }
 123                 consumed = ret;
 124                 padd->sample_rate = rate;
 125                 padd->channels = channels;
 126                 PARA_INFO_LOG("rate: %u, channels: %u\n",
 127                         padd->sample_rate, padd->channels);
 128                 padd->initialized = 1;
 129         }
 130         if (consumed >= len)
 131                 goto success;
 132         //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
 133         //      padd->consumed_total, consumed, len - consumed);
 134         outbuf = NeAACDecDecode(padd->handle, &padd->frame_info,
 135                 (unsigned char *)inbuf + consumed, len - consumed);
 136         if (padd->frame_info.error) {
 137                 int err = padd->frame_info.error;
 138                 ret = -E_AAC_DECODE;
 139                 if (padd->error_count++ > MAX_ERRORS)
 140                         goto err;
 141                 PARA_NOTICE_LOG("error #%u: (%s)\n", padd->error_count,
 142                         NeAACDecGetErrorMessage(err));
 143                 PARA_NOTICE_LOG("consumed (total, buffer, frame): "
 144                         "%zu, %zu, %lu\n",
 145                         padd->consumed_total, consumed,
 146                         padd->frame_info.bytesconsumed);
 147                 consumed++; /* just eat one byte and hope for the best */
 148                 goto success;
 149         }
 150         padd->error_count = 0;
 151         //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
 152         consumed += padd->frame_info.bytesconsumed;
 153         if (!padd->frame_info.samples)
 154                 goto success;
 155         btrbuf = para_malloc(2 * padd->frame_info.samples);
 156         loaded = 0;
 157         for (i = 0; i < padd->frame_info.samples; i++) {
 158                 short sh = ((short *)outbuf)[i];
 159                 write_int16_host_endian(btrbuf + loaded, sh);
 160                 loaded += 2;
 161         }
 162         btr_add_output(btrbuf, loaded, btrn);
 163 success:
 164         btr_consume(btrn, consumed);
 165         padd->consumed_total += consumed;
 166         goto next_buffer;
 167 err:
 168         assert(ret < 0);
 169         btr_remove_node(&fn->btrn);
 170         return ret;
 171 }
 172
 173 /**
 174  * The init function of the aacdec filter.
 175  *
 176  * \param f Pointer to the filter struct to initialize.
 177  *
 178  * \sa filter::init
 179  */
 180 void aacdec_filter_init(struct filter *f)
 181 {
 182         f->open = aacdec_open;
 183         f->close = aacdec_close;
 184         f->pre_select = generic_filter_pre_select;
 185         f->post_select = aacdec_post_select;
 186         f->execute = aacdec_execute;
 187 }