oggdec.c

   1 /*
   2  * Copyright (C) 2005-2008 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_error)
  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  * Custom data seeking function.
  62  *
  63  * Since we want the data source to be treated as unseekable at all
  64  * times, the provided seek callback always returns -1 (failure).
  65  */
  66 static int cb_seek(__a_unused void *datasource, __a_unused ogg_int64_t offset,
  67                 __a_unused int whence)
  68 {
  69         return -1;
  70 }
  71
  72 static int cb_close(__a_unused void *datasource)
  73 {
  74         return 0;
  75 }
  76
  77 static const ov_callbacks ovc = {
  78         .read_func = cb_read,
  79         .seek_func = cb_seek,
  80         .close_func = cb_close,
  81         /*
  82          * The tell function need not be provided if the data IO abstraction is
  83          * not seekable
  84          */
  85         .tell_func = NULL
  86 };
  87
  88 static void ogg_open(struct filter_node *fn)
  89 {
  90         struct private_oggdec_data *pod = para_calloc(
  91                 sizeof(struct private_oggdec_data));
  92         struct oggdec_filter_args_info *conf = fn->conf;
  93
  94         fn->private_data = pod;
  95         fn->bufsize = conf->bufsize_arg * 1024;
  96         fn->buf = para_malloc(fn->bufsize);
  97 }
  98
  99 static void ogg_close(struct filter_node *fn)
 100 {
 101         struct private_oggdec_data *pod = fn->private_data;
 102         if (pod->vf) {
 103                 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod->vf, pod);
 104                 ov_clear(pod->vf);
 105                 free(pod->vf);
 106                 pod->vf = NULL;
 107         } else
 108                 PARA_DEBUG_LOG("nothing to close in fc %p, pod = %p\n", pod->vf, pod);
 109         free(fn->buf);
 110         fn->buf = NULL;
 111         free(fn->private_data);
 112         fn->private_data = NULL;
 113 }
 114
 115 static ssize_t ogg_convert(char *inbuffer, size_t len, struct filter_node *fn)
 116 {
 117         ssize_t ret;
 118         struct private_oggdec_data *pod = fn->private_data;
 119         struct oggdec_filter_args_info *conf = fn->conf;
 120         /* make the buffer known to the read callback cb_read() */
 121         pod->inbuf = inbuffer;
 122         pod->inbuf_len = len;
 123         pod->converted = 0;
 124
 125         if (!pod->vf) {
 126                 int ib = 1024 * conf->initial_buffer_arg; /* initial buffer */
 127                 if (len <ib && !*fn->fc->input_error) {
 128                         PARA_DEBUG_LOG("initial input buffer %zd/%d, "
 129                                 "waiting for more data\n", len, ib);
 130                         return 0;
 131                 }
 132                 pod->vf = para_malloc(sizeof(struct OggVorbis_File));
 133                 PARA_NOTICE_LOG("input buffer: %zd, opening ov callbacks\n", len);
 134                 ret = ov_open_callbacks(fn, pod->vf,
 135                         NULL, /* no initial buffer */
 136                         0, /* no initial bytes */
 137                         ovc); /* the ov_open_callbacks */
 138                 if (ret == OV_EREAD)
 139                         return -E_OGGDEC_READ;
 140                 if (ret == OV_ENOTVORBIS)
 141                         return -E_OGGDEC_NOTVORBIS;
 142                 if (ret == OV_EVERSION)
 143                         return -E_OGGDEC_VERSION;
 144                 if (ret == OV_EBADHEADER)
 145                         return -E_OGGDEC_BADHEADER;
 146                 if (ret < 0)
 147                         return -E_OGGDEC_FAULT;
 148                 fn->fc->channels = ov_info(pod->vf, 0)->channels;
 149                 fn->fc->samplerate = ov_info(pod->vf, 0)->rate;
 150                 PARA_NOTICE_LOG("%d channels, %d Hz\n", fn->fc->channels,
 151                         fn->fc->samplerate);
 152         }
 153         while (!*fn->fc->input_error && fn->loaded < fn->bufsize) {
 154                 int length = fn->bufsize - fn->loaded;
 155                 long read_ret = ov_read(pod->vf, fn->buf + fn->loaded, length,
 156                         ENDIAN, 2 /* 16 bit */, 1 /* signed */, NULL);
 157                 if (read_ret == OV_HOLE || !read_ret)
 158                         return pod->converted;
 159                 if (read_ret < 0)
 160                         return -E_OGGDEC_BADLINK;
 161                 fn->loaded += read_ret;
 162         }
 163         return pod->converted;
 164 }
 165
 166 static void *oggdec_parse_config(int argc, char **argv)
 167 {
 168         struct oggdec_filter_args_info *ret = para_calloc(sizeof(struct oggdec_filter_args_info));
 169         if (!oggdec_cmdline_parser(argc, argv, ret))
 170                 return ret;
 171         free(ret);
 172         return NULL;
 173 }
 174
 175 /**
 176  * The init function of the ogg vorbis decoder.
 177  *
 178  * \param f Its fields are filled in by the function.
 179  */
 180 void oggdec_init(struct filter *f)
 181 {
 182         f->open = ogg_open;
 183         f->close = ogg_close;
 184         f->convert = ogg_convert;
 185         f->print_help = oggdec_cmdline_parser_print_help;
 186         f->parse_config = oggdec_parse_config;
 187 }