write.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 #include "para.h"
  20 #include "string.h"
  21 #include "write.cmdline.h"
  22 #include "write.h"
  23 #include "write_common.h"
  24 #include "fd.h"
  25
  26 #include <sys/time.h> /* gettimeofday */
  27
  28 #include "error.h"
  29
  30 #define WAV_HEADER_LEN 44
  31
  32 static unsigned char *audiobuf;
  33 static struct timeval *start_time;
  34 struct gengetopt_args_info conf;
  35
  36 INIT_WRITE_ERRLISTS;
  37
  38 void para_log(int ll, const char* fmt,...)
  39 {
  40         va_list argp;
  41
  42         if (ll < conf.loglevel_arg)
  43                 return;
  44         va_start(argp, fmt);
  45         vfprintf(stderr, fmt, argp);
  46         va_end(argp);
  47 }
  48
  49 /**
  50  * read WAV_HEADER_LEN bytes from stdin to audio buffer
  51  *
  52  * \return -E_READ_HDR on errors and on eof before WAV_HEADER_LEN could be
  53  * read. A positive return value indicates success.
  54  */
  55 static int read_wav_header(void)
  56 {
  57         ssize_t ret, count = 0;
  58
  59         while (count < WAV_HEADER_LEN) {
  60                 ret = read(STDIN_FILENO, audiobuf + count, WAV_HEADER_LEN - count);
  61                 if (ret <= 0)
  62                         return -E_READ_HDR;
  63                 count += ret;
  64         }
  65         return 1;
  66 }
  67
  68 /**
  69  * check if current time is later than start_time
  70  * \param diff pointer to write remaining time to
  71  *
  72  * If start_time was not given, or current time is later than given
  73  * start_time, return 0. Otherwise, return 1 and write the time
  74  * difference between current time and start_time to diff. diff may be
  75  * NULL.
  76  *
  77  */
  78 static int start_time_in_future(struct timeval *diff)
  79 {
  80         struct timeval now;
  81
  82         if (!conf.start_time_given)
  83                 return 0;
  84         gettimeofday(&now, NULL);
  85         return tv_diff(start_time, &now, diff) > 0? 1 : 0;
  86 }
  87
  88 /**
  89  * sleep until time given at command line
  90  *
  91  * This is called if the initial buffer is filled. It returns
  92  * immediately if no start_time was given at the command line
  93  * or if the given start time is in the past.
  94  *
  95  */
  96 static void do_initial_delay(struct timeval *delay)
  97 {
  98         do
  99                 para_select(1, NULL, NULL, delay);
 100         while (start_time_in_future(delay));
 101 }
 102
 103 static int read_stdin(char *buf, size_t bytes_to_load, size_t *loaded)
 104 {
 105         ssize_t ret;
 106
 107         while (*loaded < bytes_to_load) {
 108                 ret = read(STDIN_FILENO, buf + *loaded, bytes_to_load - *loaded);
 109                 if (ret <= 0) {
 110                         if (ret < 0)
 111                                 ret = -E_READ_STDIN;
 112                         return ret;
 113                 }
 114                 *loaded += ret;
 115         }
 116         return 1;
 117 }
 118 /**
 119  * play raw pcm data
 120  * \param loaded number of bytes already loaded
 121  *
 122  * If start_time was given, prebuffer data until buffer is full or
 123  * start_time is reached. In any case, do not start playing before
 124  * start_time.
 125  *
 126  * \return positive on success, negative on errors.
 127  */
 128 static int pcm_write(struct writer_node_group *wng, size_t loaded)
 129 {
 130         size_t bufsize, prebuf_size, bytes_to_load;
 131         struct timeval delay;
 132         int ret, not_yet_started = 1;
 133
 134         ret = wng_open(wng);
 135         if (ret < 0)
 136                 goto out;
 137         PARA_INFO_LOG("max chunk_bytes: %d\n", wng->max_chunk_bytes);
 138         bufsize = (conf.bufsize_arg * 1024 / wng->max_chunk_bytes)
 139                 * wng->max_chunk_bytes;
 140         audiobuf = para_realloc(audiobuf, bufsize);
 141         prebuf_size = conf.prebuffer_arg * bufsize / 100;
 142         bytes_to_load =  PARA_MAX(prebuf_size, wng->max_chunk_bytes);
 143         ret = read_stdin(audiobuf, bytes_to_load, &loaded);
 144         if (ret <= 0 || loaded < bytes_to_load) {
 145                 if (ret >= 0)
 146                         ret = -E_PREMATURE_END;
 147                 goto out;
 148         }
 149         if (not_yet_started && start_time && start_time_in_future(&delay))
 150                 do_initial_delay(&delay);
 151         not_yet_started = 0;
 152 again:
 153         ret = wng_write(wng, audiobuf, &loaded);
 154         if (ret <= 0)
 155                 goto out;
 156         ret = -E_WRITE_OVERRUN;
 157         if (loaded >= bufsize)
 158                 goto out;
 159         bytes_to_load = PARA_MIN(wng->max_chunk_bytes, bufsize);
 160         ret = read_stdin(audiobuf, bytes_to_load, &loaded);
 161         if (ret < 0)
 162                 goto out;
 163         if (!ret)
 164                 wng->eof = 1;
 165         goto again;
 166 out:
 167         wng_close(wng);
 168         return ret;
 169 }
 170 /* write.c */
 171
 172 struct writer_node_group *check_args(void)
 173 {
 174         int i, ret = -E_WRITE_SYNTAX;
 175         static struct timeval tv;
 176         struct writer_node_group *wng = NULL;
 177
 178         if (conf.list_writers_given) {
 179                 char *msg = NULL;
 180                 FOR_EACH_WRITER(i) {
 181                         char *tmp = make_message("%s%s%s",
 182                                 i? msg : "",
 183                                 i? " " : "",
 184                                 writer_names[i]);
 185                         free(msg);
 186                         msg = tmp;
 187                 }
 188                 fprintf(stderr, "%s\n", msg);
 189                 free(msg);
 190                 exit(EXIT_SUCCESS);
 191         }
 192         if (conf.prebuffer_arg < 0 || conf.prebuffer_arg > 100)
 193                 goto out;
 194         if (conf.start_time_given) {
 195                 long unsigned sec, usec;
 196                 if (sscanf(conf.start_time_arg, "%lu:%lu",
 197                                 &sec, &usec) != 2)
 198                         goto out;
 199                 tv.tv_sec = sec;
 200                 tv.tv_usec = usec;
 201                 start_time = &tv;
 202         }
 203         if (!conf.writer_given) {
 204                 wng = setup_default_wng();
 205                 ret = 1;
 206                 goto out;
 207         }
 208         wng = wng_new(conf.writer_given);
 209         for (i = 0; i < conf.writer_given; i++) {
 210                 ret = check_writer_arg(conf.writer_arg[i]);
 211                 if (ret < 0)
 212                         goto out;
 213                 wng->writer_nodes[i].writer = &writers[ret];
 214         }
 215         ret = 1;
 216 out:
 217         if (ret > 0)
 218                 return wng;
 219         free(wng);
 220         return NULL;
 221 }
 222
 223 /**
 224  * test if audio buffer contains a valid wave header
 225  *
 226  * \return If not, return 0, otherwise, store number of channels and sample rate
 227  * in struct conf and return WAV_HEADER_LEN.
 228  */
 229 static size_t check_wave(void)
 230 {
 231         unsigned char *a = audiobuf;
 232         if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' || a[3] != 'F')
 233                 return WAV_HEADER_LEN;
 234         conf.channels_arg = (unsigned) a[22];
 235         conf.sample_rate_arg = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
 236         return 0;
 237 }
 238
 239 int main(int argc, char *argv[])
 240 {
 241         int ret = -E_WRITE_SYNTAX;
 242         struct writer_node_group *wng = NULL;
 243
 244         cmdline_parser(argc, argv, &conf);
 245         wng = check_args();
 246         if (!wng)
 247                 goto out;
 248         init_supported_writers();
 249         audiobuf = para_malloc(WAV_HEADER_LEN);
 250         ret = read_wav_header();
 251         if (ret < 0)
 252                 goto out;
 253         ret = pcm_write(wng, check_wave());
 254 out:
 255         wng_destroy(wng);
 256         free(audiobuf);
 257         if (ret < 0)
 258                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 259         return ret;
 260 }