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, *outbuffer;
 101         char *btr_buf;
 102         size_t len, consumed, loaded;
 103
 104 next_buffer:
 105         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 106         if (ret < 0)
 107                 goto err;
 108         if (ret == 0)
 109                 return 0;
 110         btr_merge(btrn, fn->min_iqs);
 111         len = btr_next_buffer(btrn, &inbuf);
 112         len = PARA_MIN(len, (size_t)8192);
 113         consumed = 0;
 114         if (!padd->initialized) {
 115                 unsigned long rate = 0;
 116                 unsigned char channels = 0;
 117                 ret = NeAACDecInit(padd->handle, (unsigned char *)inbuf,
 118                         len, &rate, &channels);
 119                 PARA_INFO_LOG("decoder init: %d\n", ret);
 120                 if (ret < 0) {
 121                         ret = -E_AACDEC_INIT;
 122                         goto err;
 123                 }
 124                 consumed = ret;
 125                 padd->sample_rate = rate;
 126                 padd->channels = channels;
 127                 PARA_INFO_LOG("rate: %u, channels: %u\n",
 128                         padd->sample_rate, padd->channels);
 129                 padd->initialized = 1;
 130         }
 131         if (consumed >= len)
 132                 goto success;
 133         //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
 134         //      padd->consumed_total, consumed, len - consumed);
 135         outbuffer = NeAACDecDecode(padd->handle, &padd->frame_info,
 136                 (unsigned char *)inbuf + consumed, len - consumed);
 137         if (padd->frame_info.error) {
 138                 int err = padd->frame_info.error;
 139                 ret = -E_AAC_DECODE;
 140                 if (padd->error_count++ > MAX_ERRORS)
 141                         goto err;
 142                 PARA_NOTICE_LOG("error #%u: (%s)\n", padd->error_count,
 143                         NeAACDecGetErrorMessage(err));
 144                 PARA_NOTICE_LOG("consumed (total, buffer, frame): "
 145                         "%zu, %zu, %lu\n",
 146                         padd->consumed_total, consumed,
 147                         padd->frame_info.bytesconsumed);
 148                 if (consumed < len)
 149                         consumed++; /* catch 21 */
 150                 goto success;
 151         }
 152         padd->error_count = 0;
 153         //PARA_CRIT_LOG("decoder ate %lu\n", padd->frame_info.bytesconsumed);
 154         consumed += padd->frame_info.bytesconsumed;
 155         if (!padd->frame_info.samples)
 156                 goto success;
 157         btr_buf = para_malloc(2 * padd->frame_info.samples);
 158         loaded = 0;
 159         for (i = 0; i < padd->frame_info.samples; i++) {
 160                 short sh = ((short *)outbuffer)[i];
 161                 write_int16_host_endian(btr_buf + loaded, sh);
 162                 loaded += 2;
 163         }
 164         btr_add_output(btr_buf, loaded, btrn);
 165 success:
 166         ret = consumed;
 167         padd->consumed_total += ret;
 168         btr_consume(btrn, ret);
 169         goto next_buffer;
 170 err:
 171         assert(ret < 0);
 172         btr_remove_node(&fn->btrn);
 173         return ret;
 174 }
 175
 176 /**
 177  * The init function of the aacdec filter.
 178  *
 179  * \param f Pointer to the filter struct to initialize.
 180  *
 181  * \sa filter::init
 182  */
 183 void aacdec_filter_init(struct filter *f)
 184 {
 185         f->open = aacdec_open;
 186         f->close = aacdec_close;
 187         f->pre_select = generic_filter_pre_select;
 188         f->post_select = aacdec_post_select;
 189         f->execute = aacdec_execute;
 190 }