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