oggdec_filter.c

   1 /*
   2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file oggdec_filter.c Paraslash's ogg vorbis decoder. */
   8
   9 #include <regex.h>
  10 #include <vorbis/vorbisfile.h>
  11 #include <stdbool.h>
  12
  13 #include "para.h"
  14 #include "oggdec_filter.cmdline.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "ggo.h"
  18 #include "buffer_tree.h"
  19 #include "filter.h"
  20 #include "error.h"
  21 #include "string.h"
  22
  23 /** Determine byte sex. */
  24 #ifdef WORDS_BIGENDIAN
  25 #define ENDIAN 1
  26 #else
  27 #define ENDIAN 0
  28 #endif
  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         /** When to start producing output. */
  41         struct timeval stream_start;
  42 };
  43
  44 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
  45 {
  46         struct filter_node *fn = datasource;
  47         struct private_oggdec_data *pod = fn->private_data;
  48         size_t ret, have = pod->inbuf_len - pod->converted;
  49         char *p = pod->inbuf + pod->converted;
  50
  51 //      PARA_DEBUG_LOG("pod = %p\n", pod);
  52 //      PARA_DEBUG_LOG("vorbis requests %d bytes, have %d\n", size * nmemb, have);
  53         if (pod->inbuf_len < size) {
  54                 if (*fn->fc->input_error)
  55                         return 0;
  56                 errno = EAGAIN;
  57                 return (size_t)-1;
  58         }
  59         ret = PARA_MIN(nmemb, have / size) * size;
  60         memcpy(buf, p, ret);
  61         pod->converted += ret;
  62         return ret;
  63 }
  64
  65 /*
  66  * Custom data seeking function.
  67  *
  68  * Since we want the data source to be treated as unseekable at all
  69  * times, the provided seek callback always returns -1 (failure).
  70  */
  71 static int cb_seek(__a_unused void *datasource, __a_unused ogg_int64_t offset,
  72                 __a_unused int whence)
  73 {
  74         return -1;
  75 }
  76
  77 static int cb_close(__a_unused void *datasource)
  78 {
  79         return 0;
  80 }
  81
  82 static const ov_callbacks ovc = {
  83         .read_func = cb_read,
  84         .seek_func = cb_seek,
  85         .close_func = cb_close,
  86         /*
  87          * The tell function need not be provided if the data IO abstraction is
  88          * not seekable
  89          */
  90         .tell_func = NULL
  91 };
  92
  93 static void ogg_open(struct filter_node *fn)
  94 {
  95         struct private_oggdec_data *pod = para_calloc(
  96                 sizeof(struct private_oggdec_data));
  97         struct oggdec_filter_args_info *conf = fn->conf;
  98
  99         fn->private_data = pod;
 100         fn->bufsize = conf->bufsize_arg * 1024;
 101         fn->buf = para_malloc(fn->bufsize);
 102 }
 103
 104 static void ogg_close(struct filter_node *fn)
 105 {
 106         struct private_oggdec_data *pod = fn->private_data;
 107         if (pod->vf) {
 108                 PARA_DEBUG_LOG("ov_clearing %p, pod = %p\n", pod->vf, pod);
 109                 ov_clear(pod->vf);
 110                 free(pod->vf);
 111                 pod->vf = NULL;
 112         } else
 113                 PARA_DEBUG_LOG("nothing to close in fc %p, pod = %p\n", pod->vf, pod);
 114         free(fn->buf);
 115         fn->buf = NULL;
 116         free(fn->private_data);
 117         fn->private_data = NULL;
 118 }
 119
 120 static ssize_t ogg_convert(char *inbuffer, size_t len, struct filter_node *fn)
 121 {
 122         ssize_t ret;
 123         struct private_oggdec_data *pod = fn->private_data;
 124         struct oggdec_filter_args_info *conf = fn->conf;
 125         /* make the buffer known to the read callback cb_read() */
 126         pod->inbuf = inbuffer;
 127         pod->inbuf_len = len;
 128         pod->converted = 0;
 129
 130         if (!pod->vf) {
 131                 if (*fn->fc->input_error < 0)
 132                         return *fn->fc->input_error;
 133                 if (!len)
 134                         return 0;
 135                 pod->vf = para_malloc(sizeof(struct OggVorbis_File));
 136                 PARA_NOTICE_LOG("input buffer: %zd, opening ov callbacks\n", len);
 137                 ret = ov_open_callbacks(fn, pod->vf,
 138                         NULL, /* no initial buffer */
 139                         0, /* no initial bytes */
 140                         ovc); /* the ov_open_callbacks */
 141                 if (ret == OV_ENOTVORBIS || ret == OV_EBADHEADER) {
 142                         /* this might be due to the input buffer being too small */
 143                         int ib = 1024 * conf->initial_buffer_arg; /* initial buffer */
 144                         if (len < ib) {
 145                                 PARA_INFO_LOG("initial input buffer %zd/%d, "
 146                                         "waiting for more data\n", len, ib);
 147                                 free(pod->vf);
 148                                 pod->vf = NULL;
 149                                 return 0;
 150                         }
 151                         return ret == OV_ENOTVORBIS?
 152                                 -E_OGGDEC_NOTVORBIS : -E_OGGDEC_BADHEADER;
 153                 }
 154                 if (ret == OV_EREAD)
 155                         return -E_OGGDEC_READ;
 156                 if (ret == OV_EVERSION)
 157                         return -E_OGGDEC_VERSION;
 158                 if (ret < 0)
 159                         return -E_OGGDEC_FAULT;
 160                 fn->fc->channels = ov_info(pod->vf, 0)->channels;
 161                 fn->fc->samplerate = ov_info(pod->vf, 0)->rate;
 162                 PARA_NOTICE_LOG("%d channels, %d Hz\n", fn->fc->channels,
 163                         fn->fc->samplerate);
 164                 /* wait a bit to avoid buffer underruns */
 165                 tv_add(now, &(struct timeval){0, 500 * 1000}, &pod->stream_start);
 166                 return pod->converted;
 167         }
 168         if (tv_diff(now, &pod->stream_start, NULL) < 0) {
 169                 PARA_DEBUG_LOG("initial delay..\n");
 170                 return 0;
 171         }
 172         while (fn->loaded < fn->bufsize) {
 173                 int length = fn->bufsize - fn->loaded;
 174                 long read_ret = ov_read(pod->vf, fn->buf + fn->loaded, length,
 175                         ENDIAN, 2 /* 16 bit */, 1 /* signed */, NULL);
 176                 if (read_ret == 0)
 177                         return pod->converted;
 178                 if (read_ret == OV_HOLE) {
 179                         if (!fn->loaded) {
 180                                 PARA_INFO_LOG("hole, delaying playback\n");
 181                                 tv_add(now, &(struct timeval){0, 500 * 1000}, &pod->stream_start);
 182                         }
 183                         return pod->converted;
 184                 }
 185                 if (read_ret < 0)
 186                         return -E_OGGDEC_BADLINK;
 187                 fn->loaded += read_ret;
 188         }
 189         return pod->converted;
 190 }
 191
 192 static int oggdec_parse_config(int argc, char **argv, void **config)
 193 {
 194         int ret;
 195         struct oggdec_filter_args_info *ogg_conf;
 196
 197         ogg_conf = para_calloc(sizeof(*ogg_conf));
 198         ret = -E_OGGDEC_SYNTAX;
 199         if (oggdec_cmdline_parser(argc, argv, ogg_conf))
 200                 goto err;
 201         ret = -ERRNO_TO_PARA_ERROR(EINVAL);
 202         if (ogg_conf->bufsize_arg < 0)
 203                 goto err;
 204         if (ogg_conf->bufsize_arg >= INT_MAX / 1024)
 205                 goto err;
 206         if (ogg_conf->initial_buffer_arg < 0)
 207                 goto err;
 208         if (ogg_conf->initial_buffer_arg >= INT_MAX / 1024)
 209                 goto err;
 210         *config = ogg_conf;
 211         return 1;
 212 err:
 213         free(ogg_conf);
 214         return ret;
 215 }
 216
 217 /**
 218  * The init function of the ogg vorbis decoder.
 219  *
 220  * \param f Its fields are filled in by the function.
 221  */
 222 void oggdec_filter_init(struct filter *f)
 223 {
 224         struct oggdec_filter_args_info dummy;
 225
 226         oggdec_cmdline_parser_init(&dummy);
 227         f->open = ogg_open;
 228         f->close = ogg_close;
 229         f->convert = ogg_convert;
 230         f->parse_config = oggdec_parse_config;
 231         f->help = (struct ggo_help) {
 232                 .short_help = oggdec_filter_args_info_help,
 233                 .detailed_help = oggdec_filter_args_info_detailed_help
 234         };
 235 }