oggdec_filter.c

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