oggdec.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file oggdec.c paraslash's ogg vorbis decoder */
  20
  21 #include "para.h"
  22
  23 #include "oggdec_filter.cmdline.h"
  24 #include "list.h"
  25 #include "filter.h"
  26 #include "error.h"
  27 #include "string.h"
  28
  29 #include <vorbis/vorbisfile.h>
  30
  31 /** \cond some internal constants */
  32 #define BITS 16
  33 #define ENDIAN 0
  34 #define SIGN 1
  35 /** \endcond */
  36
  37 /** data specific to the oggdec filter */
  38 struct private_oggdec_data {
  39         /** describes an ogg vorbis file */
  40         OggVorbis_File *vf;
  41         /** the input buffer */
  42         char *inbuf;
  43         /** the length of \a inbuf */
  44         size_t inbuf_len;
  45         /** the number of bytes consumed from the input buffer */
  46         size_t converted;
  47 };
  48
  49 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  50 {
  51         struct filter_node *fn = datasource;
  52         struct private_oggdec_data *pod = fn->private_data;
  53         size_t ret, have = pod->inbuf_len - pod->converted;
  54         char *p = pod->inbuf + pod->converted;
  55
  56         if (*fn->fci->eof)
  57                 return 0;
  58 //      PARA_DEBUG_LOG("pod = %p\n", pod);
  59 //      PARA_DEBUG_LOG("vorbis requests %d bytes, have %d\n", size * nmemb, have);
  60         if (pod->inbuf_len < size) {
  61                 errno = EAGAIN;
  62                 return -1;
  63         }
  64         ret = MIN(nmemb, have / size) * size;
  65         memcpy(buf, p, ret);
  66         pod->converted += ret;
  67         return ret;
  68 }
  69
  70 /*
  71  * cb_seek -- custom data seeking function
  72  * Since we want the data source to be treated as unseekable at all
  73  * times, the provided seek callback always returns -1 (failure).
  74  */
  75 static int cb_seek(__unused void *datasource, __unused ogg_int64_t offset,
  76                 __unused int whence)
  77 {
  78         return -1;
  79 }
  80
  81 static int cb_close(__unused void *datasource)
  82 {
  83         return 0;
  84 }
  85
  86 static const ov_callbacks ovc = {
  87         .read_func = cb_read,
  88         .seek_func = cb_seek,
  89         .close_func = cb_close,
  90         /*
  91          * The tell function need not be provided if
  92          * the data IO abstraction is not seekable
  93          */
  94         .tell_func = NULL
  95 };
  96
  97 static void ogg_open(struct filter_node *fn)
  98 {
  99         struct private_oggdec_data *pod = para_calloc(
 100                 sizeof(struct private_oggdec_data));
 101         struct oggdec_filter_args_info *conf = fn->conf;
 102
 103         fn->private_data = pod;
 104         fn->bufsize = conf->bufsize_arg * 1024;
 105         fn->buf = para_malloc(fn->bufsize);
 106 }
 107
 108 static void ogg_close(struct filter_node *fn)
 109 {
 110         struct private_oggdec_data *pod = fn->private_data;
 111         if (pod->vf) {
 112                 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod->vf, pod);
 113                 ov_clear(pod->vf);
 114                 free(pod->vf);
 115                 pod->vf = NULL;
 116         } else
 117                 PARA_DEBUG_LOG("nothing to close in fc %p, pod = %p\n", pod->vf, pod);
 118         free(fn->buf);
 119         fn->buf = NULL;
 120         free(fn->private_data);
 121         fn->private_data = NULL;
 122 }
 123
 124 static ssize_t ogg_convert(char *inbuffer, size_t len, struct filter_node *fn)
 125 {
 126         ssize_t ret;
 127         struct private_oggdec_data *pod = fn->private_data;
 128         struct oggdec_filter_args_info *conf = fn->conf;
 129         /* make the buffer known to the read callback cb_read() */
 130         pod->inbuf = inbuffer;
 131         pod->inbuf_len = len;
 132         pod->converted = 0;
 133
 134         if (!pod->vf) {
 135                 int ib = 1024 * conf->initial_buffer_arg; /* initial buffer */
 136                 if (len <ib && !*fn->fci->eof && !fn->fci->error) {
 137                         PARA_INFO_LOG("initial input buffer %zd/%d, waiting for more data\n",
 138                                 len, ib);
 139                         return 0;
 140                 }
 141                 pod->vf = para_malloc(sizeof(struct OggVorbis_File));
 142                 PARA_NOTICE_LOG("input buffer: %zd, opening ov callbacks\n", len);
 143                 ret = ov_open_callbacks(fn, pod->vf,
 144                         NULL, /* no initial buffer */
 145                         0, /* no initial bytes */
 146                         ovc); /* the ov_open_callbacks */
 147                 if (ret == OV_EREAD)
 148                         return -E_OGGDEC_READ;
 149                 if (ret == OV_ENOTVORBIS)
 150                         return -E_OGGDEC_NOTVORBIS;
 151                 if (ret == OV_EVERSION)
 152                         return -E_OGGDEC_VERSION;
 153                 if (ret == OV_EBADHEADER)
 154                         return -E_OGGDEC_BADHEADER;
 155                 if (ret < 0)
 156                         return -E_OGGDEC_FAULT;
 157                 fn->fci->channels = ov_info(pod->vf, 0)->channels;
 158                 fn->fci->samplerate = ov_info(pod->vf, 0)->rate;
 159                 PARA_NOTICE_LOG("%d channels, %d Hz\n", fn->fci->channels, fn->fci->samplerate);
 160         }
 161 again:
 162         ret = ov_read(pod->vf, fn->buf + fn->loaded, fn->bufsize - fn->loaded,
 163                 ENDIAN, BITS / 8, SIGN, NULL);
 164         if (ret == OV_HOLE || !ret) {
 165                 return pod->converted;
 166         }
 167         if (ret < 0)
 168                 return -E_OGGDEC_BADLINK;
 169         fn->loaded += ret;
 170         if (!*fn->fci->eof && !fn->fci->error && fn->loaded < fn->bufsize)
 171                 goto again;
 172         return pod->converted;
 173 }
 174
 175 static void *oggdec_parse_config(int argc, char **argv)
 176 {
 177         struct oggdec_filter_args_info *ret = para_calloc(sizeof(struct oggdec_filter_args_info));
 178         if (!oggdec_cmdline_parser(argc, argv, ret))
 179                 return ret;
 180         free(ret);
 181         return NULL;
 182 }
 183
 184 /** the init function of the ogg vorbis decoder */
 185 void oggdec_init(struct filter *f)
 186 {
 187         f->open = ogg_open;
 188         f->close = ogg_close;
 189         f->convert = ogg_convert;
 190         f->print_help = oggdec_cmdline_parser_print_help;
 191         f->parse_config = oggdec_parse_config;
 192 }