write.c

   1 /*
   2  * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file write.c Paraslash's standalone wav/raw player. */
   8
   9 #include <regex.h>
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12 #include <stdbool.h>
  13
  14 #include "para.h"
  15 #include "string.h"
  16 #include "write.cmdline.h"
  17 #include "list.h"
  18 #include "sched.h"
  19 #include "ggo.h"
  20 #include "stdin.h"
  21 #include "buffer_tree.h"
  22 #include "write.h"
  23 #include "write_common.h"
  24 #include "fd.h"
  25 #include "error.h"
  26
  27 INIT_WRITE_ERRLISTS;
  28
  29 enum check_wav_state {
  30         CWS_NEED_HEADER,
  31         CWS_HAVE_HEADER,
  32         CWS_NO_HEADER,
  33 };
  34
  35 struct check_wav_task {
  36         int state;
  37         /** Number of channels specified in wav header given by \a buf. */
  38         unsigned channels;
  39         /** Sample rate specified in wav header given by \a buf. */
  40         unsigned sample_rate;
  41         /** The task structure used by the scheduler. */
  42         struct task task;
  43         struct btr_node *btrn;
  44         size_t min_iqs;
  45 };
  46
  47 static struct write_args_info conf;
  48
  49 static struct stdin_task sit;
  50
  51 /** Length of a standard wav header. */
  52 #define WAV_HEADER_LEN 44
  53
  54 /**
  55  * Test if audio buffer contains a valid wave header.
  56  *
  57  * \return If not, return -E_NO_WAV_HEADER, otherwise, return zero. If
  58  * there is less than WAV_HEADER_LEN bytes available, return one.
  59  */
  60 static void check_wav_pre_select(struct sched *s, struct task *t)
  61 {
  62         struct check_wav_task *cwt = container_of(t, struct check_wav_task, task);
  63         int ret;
  64
  65         ret = btr_node_status(cwt->btrn, cwt->min_iqs, BTR_NT_INTERNAL);
  66         if (ret != 0)
  67                 sched_min_delay(s);
  68 }
  69
  70 #define HANDLE_EXEC(_cmd) \
  71         if (!strcmp(cmd, #_cmd)) { \
  72                 if (!conf._cmd ## _given && cwt->state == CWS_NEED_HEADER) \
  73                         return -E_BTR_NAVAIL; \
  74                 *result = make_message("%d", cwt->state == CWS_NO_HEADER? \
  75                         conf._cmd ## _arg : cwt->_cmd); \
  76                 return 1; \
  77         } \
  78
  79
  80 static int check_wav_exec(struct btr_node *btrn, const char *cmd, char **result)
  81 {
  82         struct check_wav_task *cwt = btr_context(btrn);
  83
  84         HANDLE_EXEC(sample_rate);
  85         HANDLE_EXEC(channels);
  86         return -ERRNO_TO_PARA_ERROR(ENOTSUP);
  87 }
  88
  89 static void check_wav_post_select(__a_unused struct sched *s, struct task *t)
  90 {
  91         struct check_wav_task *cwt = container_of(t, struct check_wav_task, task);
  92         struct btr_node *btrn = cwt->btrn;
  93         unsigned char *a;
  94         size_t sz;
  95         int ret;
  96
  97         t->error = 0;
  98         ret = btr_node_status(btrn, cwt->min_iqs, BTR_NT_INTERNAL);
  99         if (ret <= 0)
 100                 goto out;
 101         if (cwt->state != CWS_NEED_HEADER)
 102                 goto pushdown;
 103         btr_merge(btrn, cwt->min_iqs);
 104         sz = btr_next_buffer(btrn, (char **)&a);
 105         if (sz < cwt->min_iqs) /* file size less than WAV_HEADER_SIZE */
 106                 goto pushdown;
 107         cwt->min_iqs = 0;
 108         cwt->channels = 2;
 109         cwt->sample_rate = 44100;
 110         if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' || a[3] != 'F') {
 111                 PARA_NOTICE_LOG("wav header not found\n");
 112                 cwt->state = CWS_NO_HEADER;
 113                 sprintf(t->status, "check wav: no header");
 114                 goto out;
 115         }
 116         PARA_INFO_LOG("found wav header\n");
 117         cwt->state = CWS_HAVE_HEADER;
 118         sprintf(t->status, "check wav: have header");
 119         cwt->channels = (unsigned) a[22];
 120         cwt->sample_rate = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
 121         PARA_INFO_LOG("channels: %d, sample rate: %d\n", cwt->channels, cwt->sample_rate);
 122         btr_consume(btrn, WAV_HEADER_LEN);
 123 pushdown:
 124         btr_pushdown(btrn);
 125 out:
 126         t->error = ret;
 127         if (ret < 0)
 128                 btr_remove_node(btrn);
 129 }
 130
 131 static int loglevel;
 132 INIT_STDERR_LOGGING(loglevel)
 133
 134 __noreturn static void print_help_and_die(void)
 135 {
 136         int d = conf.detailed_help_given;
 137         const char **p = d? write_args_info_detailed_help
 138                 : write_args_info_help;
 139
 140         printf_or_die("%s\n\n", WRITE_CMDLINE_PARSER_PACKAGE "-"
 141                 WRITE_CMDLINE_PARSER_VERSION);
 142         printf_or_die("%s\n\n", write_args_info_usage);
 143         for (; *p; p++)
 144                 printf_or_die("%s\n", *p);
 145         print_writer_helps(d);
 146         exit(0);
 147 }
 148
 149 static int main_btr(struct sched *s)
 150 {
 151         int i, ret;
 152         struct check_wav_task _cwt, *cwt = &_cwt;
 153         struct writer_node *wns;
 154
 155         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 156         sit.btrn = btr_new_node(&(struct btr_node_description)
 157                 EMBRACE(.name = "stdin"));
 158         stdin_set_defaults(&sit);
 159         register_task(&sit.task);
 160
 161         cwt->state = CWS_NEED_HEADER;
 162         cwt->min_iqs = WAV_HEADER_LEN;
 163         cwt->btrn = btr_new_node(&(struct btr_node_description)
 164                 EMBRACE(.name = "check_wav", .parent = sit.btrn,
 165                 .handler = check_wav_exec, .context = cwt));
 166         sprintf(cwt->task.status, "check_wav");
 167         cwt->task.pre_select = check_wav_pre_select;
 168         cwt->task.post_select = check_wav_post_select;
 169         cwt->task.error = 0;
 170         register_task(&cwt->task);
 171
 172         ret = -E_WRITE_SYNTAX;
 173         if (!conf.writer_given) {
 174                 i = 0;
 175                 wns = para_calloc(sizeof(*wns));
 176                 ret = setup_writer_node(NULL, cwt->btrn, wns);
 177                 if (ret < 0)
 178                         goto out;
 179                 i = 1;
 180         } else {
 181                 wns = para_calloc(conf.writer_given * sizeof(*wns));
 182                 for (i = 0; i < conf.writer_given; i++) {
 183                         ret = setup_writer_node(conf.writer_arg[i],
 184                                 cwt->btrn, wns + i);
 185                         if (ret < 0)
 186                                 goto out;
 187                 }
 188         }
 189
 190         s->default_timeout.tv_sec = 10;
 191         s->default_timeout.tv_usec = 50000;
 192         ret = schedule(s);
 193 out:
 194         for (i--; i >= 0; i--) {
 195                 struct writer_node *wn = wns + i;
 196                 struct writer *w = writers + wn->writer_num;
 197
 198                 w->close(wn);
 199                 btr_free_node(wn->btrn);
 200                 free(wn->conf);
 201         }
 202         free(wns);
 203         btr_free_node(cwt->btrn);
 204         return ret;
 205 }
 206
 207 /**
 208  * Para_write's main function.
 209  *
 210  * \param argc The usual argument counter.
 211  * \param argv The usual argument vector.
 212  *
 213  * It sets up and starts the tasks and the buffer tree nodes determined by
 214  * command line options.
 215  *
 216  * \return \p EXIT_SUCCESS or EXIT_FAILURE
 217  */
 218 int main(int argc, char *argv[])
 219 {
 220         int ret = -E_WRITE_SYNTAX;
 221         static struct sched s;
 222
 223         writer_init();
 224         write_cmdline_parser(argc, argv, &conf);
 225         HANDLE_VERSION_FLAG("write", conf);
 226         if (conf.help_given || conf.detailed_help_given)
 227                 print_help_and_die();
 228
 229         ret = main_btr(&s);
 230         if (ret < 0) {
 231                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 232                 exit(EXIT_FAILURE);
 233         }
 234         exit(EXIT_SUCCESS);
 235 }