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