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