oggdec.c

   1 /*
   2  * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file oggdec.c paraslash's ogg vorbis decoder */
   8
   9 #include "para.h"
  10
  11 #include "oggdec_filter.cmdline.h"
  12 #include "list.h"
  13 #include "sched.h"
  14 #include "filter.h"
  15 #include "error.h"
  16 #include "string.h"
  17
  18 #include <vorbis/vorbisfile.h>
  19
  20 /** \cond some internal constants */
  21 #define BITS 16
  22 #ifdef WORDS_BIGENDIAN
  23 #define ENDIAN 1
  24 #else
  25 #define ENDIAN 0
  26 #endif
  27 #define SIGN 1
  28 /** \endcond */
  29
  30 /** data specific to the oggdec filter */
  31 struct private_oggdec_data {
  32         /** describes an ogg vorbis file */
  33         OggVorbis_File *vf;
  34         /** the input buffer */
  35         char *inbuf;
  36         /** the length of \a inbuf */
  37         size_t inbuf_len;
  38         /** the number of bytes consumed from the input buffer */
  39         size_t converted;
  40 };
  41
  42 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  43 {
  44         struct filter_node *fn = datasource;
  45         struct private_oggdec_data *pod = fn->private_data;
  46         size_t ret, have = pod->inbuf_len - pod->converted;
  47         char *p = pod->inbuf + pod->converted;
  48
  49 //      PARA_DEBUG_LOG("pod = %p\n", pod);
  50 //      PARA_DEBUG_LOG("vorbis requests %d bytes, have %d\n", size * nmemb, have);
  51         if (pod->inbuf_len < size) {
  52                 if (*fn->fc->input_eof)
  53                         return 0;
  54                 errno = EAGAIN;
  55                 return (size_t)-1;
  56         }
  57         ret = PARA_MIN(nmemb, have / size) * size;
  58         memcpy(buf, p, ret);
  59         pod->converted += ret;
  60         return ret;
  61 }
  62
  63 /*
  64  * cb_seek -- custom data seeking function
  65  * Since we want the data source to be treated as unseekable at all
  66  * times, the provided seek callback always returns -1 (failure).
  67  */
  68 static int cb_seek(__a_unused void *datasource, __a_unused ogg_int64_t offset,
  69                 __a_unused int whence)
  70 {
  71         return -1;
  72 }
  73
  74 static int cb_close(__a_unused void *datasource)
  75 {
  76         return 0;
  77 }
  78
  79 static const ov_callbacks ovc = {
  80         .read_func = cb_read,
  81         .seek_func = cb_seek,
  82         .close_func = cb_close,
  83         /*
  84          * The tell function need not be provided if
  85          * the data IO abstraction is not seekable
  86          */
  87         .tell_func = NULL
  88 };
  89
  90 static void ogg_open(struct filter_node *fn)
  91 {
  92         struct private_oggdec_data *pod = para_calloc(
  93                 sizeof(struct private_oggdec_data));
  94         struct oggdec_filter_args_info *conf = fn->conf;
  95
  96         fn->private_data = pod;
  97         fn->bufsize = conf->bufsize_arg * 1024;
  98         fn->buf = para_malloc(fn->bufsize);
  99 }
 100
 101 static void ogg_close(struct filter_node *fn)
 102 {
 103         struct private_oggdec_data *pod = fn->private_data;
 104         if (pod->vf) {
 105                 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod->vf, pod);
 106                 ov_clear(pod->vf);
 107                 free(pod->vf);
 108                 pod->vf = NULL;
 109         } else
 110                 PARA_DEBUG_LOG("nothing to close in fc %p, pod = %p\n", pod->vf, pod);
 111         free(fn->buf);
 112         fn->buf = NULL;
 113         free(fn->private_data);
 114         fn->private_data = NULL;
 115 }
 116
 117 static ssize_t ogg_convert(char *inbuffer, size_t len, struct filter_node *fn)
 118 {
 119         ssize_t ret;
 120         struct private_oggdec_data *pod = fn->private_data;
 121         struct oggdec_filter_args_info *conf = fn->conf;
 122         /* make the buffer known to the read callback cb_read() */
 123         pod->inbuf = inbuffer;
 124         pod->inbuf_len = len;
 125         pod->converted = 0;
 126
 127         if (!pod->vf) {
 128                 int ib = 1024 * conf->initial_buffer_arg; /* initial buffer */
 129                 if (len <ib && !*fn->fc->input_eof) {
 130                         PARA_DEBUG_LOG("initial input buffer %zd/%d, "
 131                                 "waiting for more data\n", len, ib);
 132                         return 0;
 133                 }
 134                 pod->vf = para_malloc(sizeof(struct OggVorbis_File));
 135                 PARA_NOTICE_LOG("input buffer: %zd, opening ov callbacks\n", len);
 136                 ret = ov_open_callbacks(fn, pod->vf,
 137                         NULL, /* no initial buffer */
 138                         0, /* no initial bytes */
 139                         ovc); /* the ov_open_callbacks */
 140                 if (ret == OV_EREAD)
 141                         return -E_OGGDEC_READ;
 142                 if (ret == OV_ENOTVORBIS)
 143                         return -E_OGGDEC_NOTVORBIS;
 144                 if (ret == OV_EVERSION)
 145                         return -E_OGGDEC_VERSION;
 146                 if (ret == OV_EBADHEADER)
 147                         return -E_OGGDEC_BADHEADER;
 148                 if (ret < 0)
 149                         return -E_OGGDEC_FAULT;
 150                 fn->fc->channels = ov_info(pod->vf, 0)->channels;
 151                 fn->fc->samplerate = ov_info(pod->vf, 0)->rate;
 152                 PARA_NOTICE_LOG("%d channels, %d Hz\n", fn->fc->channels,
 153                         fn->fc->samplerate);
 154         }
 155         while (!*fn->fc->input_eof && fn->loaded < fn->bufsize) {
 156                 int length = fn->bufsize - fn->loaded;
 157                 long read_ret = ov_read(pod->vf, fn->buf + fn->loaded, length,
 158                         ENDIAN, BITS / 8, SIGN, NULL);
 159                 if (read_ret == OV_HOLE || !read_ret)
 160                         return pod->converted;
 161                 if (read_ret < 0)
 162                         return -E_OGGDEC_BADLINK;
 163                 fn->loaded += read_ret;
 164         }
 165         return pod->converted;
 166 }
 167
 168 static void *oggdec_parse_config(int argc, char **argv)
 169 {
 170         struct oggdec_filter_args_info *ret = para_calloc(sizeof(struct oggdec_filter_args_info));
 171         if (!oggdec_cmdline_parser(argc, argv, ret))
 172                 return ret;
 173         free(ret);
 174         return NULL;
 175 }
 176
 177 /** the init function of the ogg vorbis decoder */
 178 void oggdec_init(struct filter *f)
 179 {
 180         f->open = ogg_open;
 181         f->close = ogg_close;
 182         f->convert = ogg_convert;
 183         f->print_help = oggdec_cmdline_parser_print_help;
 184         f->parse_config = oggdec_parse_config;
 185 }