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 "buffer_tree.h"
  21 #include "filter.h"
  22 #include "error.h"
  23 #include "string.h"
  24
  25 /** Give up decoding after that many errors. */
  26 #define MAX_ERRORS 20
  27
  28 /**
  29  * data specific to the aacdec filter
  30  *
  31  * \sa filter, filter_node
  32  */
  33 struct private_aacdec_data {
  34         /** the return value of aac_open */
  35         NeAACDecHandle handle;
  36         /** whether this instance of the aac decoder is already initialized */
  37         bool initialized;
  38         /** number of times the decoder returned an error */
  39         unsigned error_count;
  40         /** number of bytes already consumed from the imput stream */
  41         size_t consumed_total;
  42         /** The number of channels of the current stream. */
  43         unsigned int channels;
  44         /** Current sample rate in Hz. */
  45         unsigned int sample_rate;
  46 };
  47
  48 static int aacdec_execute(struct btr_node *btrn, const char *cmd, char **result)
  49 {
  50         struct filter_node *fn = btr_context(btrn);
  51         struct private_aacdec_data *padd = fn->private_data;
  52
  53         return decoder_execute(cmd, padd->sample_rate, padd->channels, result);
  54 }
  55
  56 static void aacdec_open(struct filter_node *fn)
  57 {
  58         NeAACDecConfigurationPtr c;
  59         struct private_aacdec_data *padd = para_calloc(sizeof(*padd));
  60
  61         padd->handle = NeAACDecOpen();
  62         c = NeAACDecGetCurrentConfiguration(padd->handle);
  63         c->defObjectType = LC;
  64         c->outputFormat = FAAD_FMT_16BIT;
  65         c->downMatrix = 0;
  66         NeAACDecSetConfiguration(padd->handle, c);
  67
  68         fn->private_data = padd;
  69         fn->min_iqs = 2048;
  70 }
  71
  72 static void aacdec_close(struct filter_node *fn)
  73 {
  74         struct private_aacdec_data *padd = fn->private_data;
  75
  76         NeAACDecClose(padd->handle);
  77         free(padd);
  78         fn->private_data = NULL;
  79 }
  80
  81 static int aacdec_post_select(__a_unused struct sched *s, void *context)
  82 {
  83         struct filter_node *fn = context;
  84         struct btr_node *btrn = fn->btrn;
  85         struct private_aacdec_data *padd = fn->private_data;
  86         int i, ret;
  87         char *inbuf, *outbuf, *btrbuf;
  88         size_t len, consumed, loaded = 0;
  89         NeAACDecFrameInfo frame_info;
  90
  91 next_buffer:
  92         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
  93         if (ret < 0)
  94                 goto err;
  95         if (ret == 0)
  96                 return 0;
  97         btr_merge(btrn, fn->min_iqs);
  98         len = btr_next_buffer(btrn, &inbuf);
  99         len = PARA_MIN(len, (size_t)8192);
 100         consumed = 0;
 101         if (!padd->initialized) {
 102                 unsigned long rate = 0;
 103                 unsigned char channels = 0;
 104                 ret = NeAACDecInit(padd->handle, (unsigned char *)inbuf,
 105                         len, &rate, &channels);
 106                 PARA_INFO_LOG("decoder init: %d\n", ret);
 107                 if (ret < 0) {
 108                         ret = -E_AACDEC_INIT;
 109                         goto err;
 110                 }
 111                 consumed = ret;
 112                 padd->sample_rate = rate;
 113                 padd->channels = channels;
 114                 PARA_INFO_LOG("rate: %u, channels: %u\n",
 115                         padd->sample_rate, padd->channels);
 116                 padd->initialized = true;
 117         }
 118         if (consumed >= len)
 119                 goto success;
 120         //PARA_CRIT_LOG("consumed: %zu (%zu + %zu), have: %zu\n", padd->consumed_total + consumed,
 121         //      padd->consumed_total, consumed, len - consumed);
 122         outbuf = NeAACDecDecode(padd->handle, &frame_info,
 123                 (unsigned char *)inbuf + consumed, len - consumed);
 124         if (frame_info.error) {
 125                 int err = frame_info.error;
 126                 ret = -E_AAC_DECODE;
 127                 if (padd->error_count++ > MAX_ERRORS)
 128                         goto err;
 129                 PARA_NOTICE_LOG("error #%u: (%s)\n", padd->error_count,
 130                         NeAACDecGetErrorMessage(err));
 131                 PARA_NOTICE_LOG("consumed (total, buffer, frame): "
 132                         "%zu, %zu, %lu\n",
 133                         padd->consumed_total, consumed,
 134                         frame_info.bytesconsumed);
 135                 consumed++; /* just eat one byte and hope for the best */
 136                 goto success;
 137         }
 138         padd->error_count = 0;
 139         //PARA_CRIT_LOG("decoder ate %lu\n", frame_info.bytesconsumed);
 140         consumed += frame_info.bytesconsumed;
 141         if (!frame_info.samples)
 142                 goto success;
 143         btrbuf = para_malloc(2 * frame_info.samples);
 144         for (i = 0; i < frame_info.samples; i++) {
 145                 short sh = ((short *)outbuf)[i];
 146                 write_int16_host_endian(btrbuf + loaded, sh);
 147                 loaded += 2;
 148         }
 149         btr_add_output(btrbuf, loaded, btrn);
 150 success:
 151         btr_consume(btrn, consumed);
 152         padd->consumed_total += consumed;
 153         if (loaded == 0)
 154                 goto next_buffer;
 155         return 1;
 156 err:
 157         assert(ret < 0);
 158         btr_remove_node(&fn->btrn);
 159         return ret;
 160 }
 161
 162 const struct filter lsg_filter_cmd_com_aacdec_user_data = {
 163         .open = aacdec_open,
 164         .close = aacdec_close,
 165         .pre_select = generic_filter_pre_select,
 166         .post_select = aacdec_post_select,
 167         .execute = aacdec_execute
 168 };