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