oggdec.c

   1 /*
   2  * Copyright (C) 2005-2007 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 "sched.h"
  26 #include "filter.h"
  27 #include "error.h"
  28 #include "string.h"
  29
  30 #include <vorbis/vorbisfile.h>
  31
  32 /** \cond some internal constants */
  33 #define BITS 16
  34 #ifdef WORDS_BIGENDIAN
  35 #define ENDIAN 1
  36 #else
  37 #define ENDIAN 0
  38 #endif
  39 #define SIGN 1
  40 /** \endcond */
  41
  42 /** data specific to the oggdec filter */
  43 struct private_oggdec_data {
  44         /** describes an ogg vorbis file */
  45         OggVorbis_File *vf;
  46         /** the input buffer */
  47         char *inbuf;
  48         /** the length of \a inbuf */
  49         size_t inbuf_len;
  50         /** the number of bytes consumed from the input buffer */
  51         size_t converted;
  52 };
  53
  54 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  55 {
  56         struct filter_node *fn = datasource;
  57         struct private_oggdec_data *pod = fn->private_data;
  58         size_t ret, have = pod->inbuf_len - pod->converted;
  59         char *p = pod->inbuf + pod->converted;
  60
  61 //      PARA_DEBUG_LOG("pod = %p\n", pod);
  62 //      PARA_DEBUG_LOG("vorbis requests %d bytes, have %d\n", size * nmemb, have);
  63         if (pod->inbuf_len < size) {
  64                 if (*fn->fc->input_eof)
  65                         return 0;
  66                 errno = EAGAIN;
  67                 return (size_t)-1;
  68         }
  69         ret = PARA_MIN(nmemb, have / size) * size;
  70         memcpy(buf, p, ret);
  71         pod->converted += ret;
  72         return ret;
  73 }
  74
  75 /*
  76  * cb_seek -- custom data seeking function
  77  * Since we want the data source to be treated as unseekable at all
  78  * times, the provided seek callback always returns -1 (failure).
  79  */
  80 static int cb_seek(__a_unused void *datasource, __a_unused ogg_int64_t offset,
  81                 __a_unused int whence)
  82 {
  83         return -1;
  84 }
  85
  86 static int cb_close(__a_unused void *datasource)
  87 {
  88         return 0;
  89 }
  90
  91 static const ov_callbacks ovc = {
  92         .read_func = cb_read,
  93         .seek_func = cb_seek,
  94         .close_func = cb_close,
  95         /*
  96          * The tell function need not be provided if
  97          * the data IO abstraction is not seekable
  98          */
  99         .tell_func = NULL
 100 };
 101
 102 static void ogg_open(struct filter_node *fn)
 103 {
 104         struct private_oggdec_data *pod = para_calloc(
 105                 sizeof(struct private_oggdec_data));
 106         struct oggdec_filter_args_info *conf = fn->conf;
 107
 108         fn->private_data = pod;
 109         fn->bufsize = conf->bufsize_arg * 1024;
 110         fn->buf = para_malloc(fn->bufsize);
 111 }
 112
 113 static void ogg_close(struct filter_node *fn)
 114 {
 115         struct private_oggdec_data *pod = fn->private_data;
 116         if (pod->vf) {
 117                 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod->vf, pod);
 118                 ov_clear(pod->vf);
 119                 free(pod->vf);
 120                 pod->vf = NULL;
 121         } else
 122                 PARA_DEBUG_LOG("nothing to close in fc %p, pod = %p\n", pod->vf, pod);
 123         free(fn->buf);
 124         fn->buf = NULL;
 125         free(fn->private_data);
 126         fn->private_data = NULL;
 127 }
 128
 129 static ssize_t ogg_convert(char *inbuffer, size_t len, struct filter_node *fn)
 130 {
 131         ssize_t ret;
 132         struct private_oggdec_data *pod = fn->private_data;
 133         struct oggdec_filter_args_info *conf = fn->conf;
 134         /* make the buffer known to the read callback cb_read() */
 135         pod->inbuf = inbuffer;
 136         pod->inbuf_len = len;
 137         pod->converted = 0;
 138
 139         if (!pod->vf) {
 140                 int ib = 1024 * conf->initial_buffer_arg; /* initial buffer */
 141                 if (len <ib && !*fn->fc->input_eof) {
 142                         PARA_DEBUG_LOG("initial input buffer %zd/%d, "
 143                                 "waiting for more data\n", len, ib);
 144                         return 0;
 145                 }
 146                 pod->vf = para_malloc(sizeof(struct OggVorbis_File));
 147                 PARA_NOTICE_LOG("input buffer: %zd, opening ov callbacks\n", len);
 148                 ret = ov_open_callbacks(fn, pod->vf,
 149                         NULL, /* no initial buffer */
 150                         0, /* no initial bytes */
 151                         ovc); /* the ov_open_callbacks */
 152                 if (ret == OV_EREAD)
 153                         return -E_OGGDEC_READ;
 154                 if (ret == OV_ENOTVORBIS)
 155                         return -E_OGGDEC_NOTVORBIS;
 156                 if (ret == OV_EVERSION)
 157                         return -E_OGGDEC_VERSION;
 158                 if (ret == OV_EBADHEADER)
 159                         return -E_OGGDEC_BADHEADER;
 160                 if (ret < 0)
 161                         return -E_OGGDEC_FAULT;
 162                 fn->fc->channels = ov_info(pod->vf, 0)->channels;
 163                 fn->fc->samplerate = ov_info(pod->vf, 0)->rate;
 164                 PARA_NOTICE_LOG("%d channels, %d Hz\n", fn->fc->channels,
 165                         fn->fc->samplerate);
 166         }
 167         while (!*fn->fc->input_eof && fn->loaded < fn->bufsize) {
 168                 int length = fn->bufsize - fn->loaded;
 169                 long read_ret = ov_read(pod->vf, fn->buf + fn->loaded, length,
 170                         ENDIAN, BITS / 8, SIGN, NULL);
 171                 if (read_ret == OV_HOLE || !read_ret)
 172                         return pod->converted;
 173                 if (read_ret < 0)
 174                         return -E_OGGDEC_BADLINK;
 175                 fn->loaded += read_ret;
 176         }
 177         return pod->converted;
 178 }
 179
 180 static void *oggdec_parse_config(int argc, char **argv)
 181 {
 182         struct oggdec_filter_args_info *ret = para_calloc(sizeof(struct oggdec_filter_args_info));
 183         if (!oggdec_cmdline_parser(argc, argv, ret))
 184                 return ret;
 185         free(ret);
 186         return NULL;
 187 }
 188
 189 /** the init function of the ogg vorbis decoder */
 190 void oggdec_init(struct filter *f)
 191 {
 192         f->open = ogg_open;
 193         f->close = ogg_close;
 194         f->convert = ogg_convert;
 195         f->print_help = oggdec_cmdline_parser_print_help;
 196         f->parse_config = oggdec_parse_config;
 197 }