oggdec_filter.c

   1 /*
   2  * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file oggdec_filter.c Paraslash's ogg vorbis decoder. */
   8
   9 #include <regex.h>
  10 #include <vorbis/vorbisfile.h>
  11 #include <stdbool.h>
  12
  13 #include "para.h"
  14 #include "list.h"
  15 #include "sched.h"
  16 #include "ggo.h"
  17 #include "buffer_tree.h"
  18 #include "filter.h"
  19 #include "error.h"
  20 #include "string.h"
  21
  22 /** Determine byte sex. */
  23 #ifdef WORDS_BIGENDIAN
  24 #define ENDIAN 1
  25 #else
  26 #define ENDIAN 0
  27 #endif
  28
  29 /** Data specific to the oggdec filter. */
  30 struct private_oggdec_data {
  31         /** Describes an ogg vorbis file. */
  32         OggVorbis_File *vf;
  33         /** The number of bytes consumed from the input buffer. */
  34         size_t converted;
  35         /** The number of channels of the current stream. */
  36         unsigned int channels;
  37         /** Current sample rate in Hz. */
  38         unsigned int sample_rate;
  39         /** Whether everything was decoded during the previous iteration. */
  40         bool have_more;
  41 };
  42
  43 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  44 {
  45         struct filter_node *fn = datasource;
  46         struct private_oggdec_data *pod = fn->private_data;
  47         struct btr_node *btrn = fn->btrn;
  48         char *btr_buf;
  49         size_t nbytes = btr_next_buffer(btrn, &btr_buf), tmp;
  50
  51         /**
  52          * oggvorbis always uses size == 1. Other sizes would complicate the code
  53          * for no real gain. So we simply don't support size != 1.
  54          */
  55         assert(size == 1);
  56         assert(pod->converted <= nbytes);
  57         tmp = nbytes - pod->converted;
  58         PARA_DEBUG_LOG("vorbis requests %zu bytes have %zu\n", nmemb, tmp);
  59         tmp = PARA_MIN(tmp, nmemb);
  60         if (tmp == 0)
  61                 return 0;
  62         memcpy(buf, btr_buf + pod->converted, tmp);
  63         pod->converted += tmp;
  64         return tmp;
  65 }
  66
  67 /*
  68  * Custom data seeking function.
  69  *
  70  * Since we want the data source to be treated as unseekable at all
  71  * times, the provided seek callback always returns -1 (failure).
  72  */
  73 static int cb_seek(__a_unused void *datasource, __a_unused ogg_int64_t offset,
  74                 __a_unused int whence)
  75 {
  76         return -1;
  77 }
  78
  79 static int cb_close(__a_unused void *datasource)
  80 {
  81         return 0;
  82 }
  83
  84 static const ov_callbacks ovc = {
  85         .read_func = cb_read,
  86         .seek_func = cb_seek,
  87         .close_func = cb_close,
  88         /*
  89          * The tell function need not be provided if the data IO abstraction is
  90          * not seekable
  91          */
  92         .tell_func = NULL
  93 };
  94
  95 static void ogg_open(struct filter_node *fn)
  96 {
  97         fn->private_data = para_calloc(sizeof(struct private_oggdec_data));
  98         fn->min_iqs = 8000;
  99 }
 100
 101 static void ogg_close(struct filter_node *fn)
 102 {
 103         struct private_oggdec_data *pod = fn->private_data;
 104
 105         if (pod && pod->vf) {
 106                 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod->vf, pod);
 107                 ov_clear(pod->vf);
 108                 free(pod->vf);
 109                 pod->vf = NULL;
 110         } else
 111                 PARA_DEBUG_LOG("nothing to close\n");
 112         free(pod);
 113         fn->private_data = NULL;
 114 }
 115
 116 static int oggdec_execute(struct btr_node *btrn, const char *cmd, char **result)
 117 {
 118         struct filter_node *fn = btr_context(btrn);
 119         struct private_oggdec_data *pod = fn->private_data;
 120
 121         return decoder_execute(cmd, pod->sample_rate, pod->channels, result);
 122 }
 123
 124 static int ogg_init(struct filter_node *fn)
 125 {
 126         struct private_oggdec_data *pod = fn->private_data;
 127         struct btr_node *btrn = fn->btrn;
 128         int ret, oret;
 129         size_t iqs;
 130         struct OggVorbis_File *vf = para_malloc(sizeof(*vf));
 131
 132         PARA_NOTICE_LOG("iqs: %zu, min_iqs: %zu, opening ov callbacks\n",
 133                 btr_get_input_queue_size(btrn), fn->min_iqs);
 134 open:
 135         oret = ov_open_callbacks(fn, vf,
 136                 NULL, /* no initial buffer */
 137                 0, /* no initial bytes */
 138                 ovc); /* the ov_open_callbacks */
 139         if (oret == OV_ENOTVORBIS || oret == OV_EBADHEADER) {
 140                 /* this might be due to the input buffer being too small */
 141                 if (!btr_no_parent(btrn)) {
 142                         fn->min_iqs += 1000;
 143                         iqs = btr_get_input_queue_size(btrn);
 144                         ret = 0;
 145                         if (iqs < fn->min_iqs)
 146                                 goto out;
 147                         PARA_CRIT_LOG("iqs: %zu\n", iqs);
 148                         btr_merge(btrn, fn->min_iqs);
 149                         pod->converted = 0;
 150                         goto open;
 151                 }
 152                 ret = (oret == OV_ENOTVORBIS)?
 153                         -E_OGGDEC_NOTVORBIS : -E_OGGDEC_BADHEADER;
 154                 goto out;
 155         }
 156         ret = -E_OGGDEC_READ;
 157         if (oret == OV_EREAD)
 158                 goto out;
 159         ret = -E_OGGDEC_VERSION;
 160         if (oret == OV_EVERSION)
 161                 goto out;
 162         ret = -E_OGGDEC_FAULT;
 163         if (oret < 0)
 164                 goto out;
 165         pod->channels = ov_info(vf, 0)->channels;
 166         pod->sample_rate = ov_info(vf, 0)->rate;
 167         PARA_NOTICE_LOG("%d channels, %d Hz\n", pod->channels,
 168                 pod->sample_rate);
 169         ret = 1;
 170 out:
 171         if (ret <= 0)
 172                 free(vf);
 173         else {
 174                 btr_consume(btrn, pod->converted);
 175                 pod->converted = 0;
 176                 fn->min_iqs = 0;
 177                 pod->vf = vf;
 178                 pod->have_more = true;
 179         }
 180         return ret;
 181 }
 182
 183 #define OGGDEC_MAX_OUTPUT_SIZE (96 * 1024)
 184 #define OGGDEC_OUTPUT_CHUNK_SIZE (32 * 1024)
 185
 186 static void ogg_pre_select(struct sched *s, struct task *t)
 187 {
 188         struct filter_node *fn = container_of(t, struct filter_node, task);
 189         struct private_oggdec_data *pod = fn->private_data;
 190         struct btr_node *btrn = fn->btrn;
 191         int ret;
 192
 193         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 194         if (ret != 0)
 195                 return sched_min_delay(s);
 196         if (!pod->have_more)
 197                 return;
 198         if (btr_get_output_queue_size(btrn) > OGGDEC_MAX_OUTPUT_SIZE)
 199                 return;
 200         sched_min_delay(s);
 201 }
 202
 203 static void ogg_post_select(__a_unused struct sched *s, struct task *t)
 204 {
 205         struct filter_node *fn = container_of(t, struct filter_node, task);
 206         struct private_oggdec_data *pod = fn->private_data;
 207         struct btr_node *btrn = fn->btrn;
 208         int ret, have;
 209         char *buf;
 210
 211         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 212         if (ret < 0 && ret != -E_BTR_EOF) /* fatal error */
 213                 goto out;
 214         if (ret <= 0 && !pod->have_more) /* nothing to do */
 215                 goto out;
 216         if (!pod->vf) {
 217                 if (ret <= 0)
 218                         goto out;
 219                 btr_merge(btrn, fn->min_iqs);
 220                 ret = ogg_init(fn);
 221                 goto out;
 222         }
 223         have = 0;
 224         buf = para_malloc(OGGDEC_OUTPUT_CHUNK_SIZE);
 225         for (;;) {
 226                 ret = ov_read(pod->vf, buf + have, OGGDEC_OUTPUT_CHUNK_SIZE - have,
 227                         ENDIAN, 2 /* 16 bit */, 1 /* signed */, NULL);
 228                 btr_consume(btrn, pod->converted);
 229                 pod->converted = 0;
 230                 if (ret <= 0)
 231                         break;
 232                 fn->min_iqs = 0;
 233                 have += ret;
 234                 if (have < OGGDEC_OUTPUT_CHUNK_SIZE)
 235                         continue;
 236                 if (btr_get_output_queue_size(btrn) > OGGDEC_MAX_OUTPUT_SIZE)
 237                         break;
 238                 btr_add_output(buf, have, btrn);
 239                 buf = para_malloc(OGGDEC_OUTPUT_CHUNK_SIZE);
 240                 have = 0;
 241         }
 242         pod->have_more = (ret > 0);
 243         if (have > 0)
 244                 btr_add_output(buf, have, btrn);
 245         else
 246                 free(buf);
 247         if (ret == OV_HOLE) /* avoid buffer underruns */
 248                 fn->min_iqs = 9000;
 249         if (ret >= 0 || ret == OV_HOLE)
 250                 return;
 251         ret = -E_OGGDEC_BADLINK;
 252 out:
 253         t->error = ret;
 254         if (ret < 0)
 255                 btr_remove_node(btrn);
 256 }
 257
 258 /**
 259  * The init function of the ogg vorbis decoder.
 260  *
 261  * \param f Its fields are filled in by the function.
 262  */
 263 void oggdec_filter_init(struct filter *f)
 264 {
 265         f->open = ogg_open;
 266         f->close = ogg_close;
 267         f->pre_select = ogg_pre_select;
 268         f->post_select = ogg_post_select;
 269         f->execute = oggdec_execute;
 270 }