write.c

   1 /*
   2  * Copyright (C) 2005-2011 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 <stdbool.h>
  12
  13 #include "para.h"
  14 #include "string.h"
  15 #include "write.cmdline.h"
  16 #include "list.h"
  17 #include "sched.h"
  18 #include "ggo.h"
  19 #include "stdin.h"
  20 #include "buffer_tree.h"
  21 #include "write.h"
  22 #include "write_common.h"
  23 #include "fd.h"
  24 #include "error.h"
  25 #include "version.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 /* Information extracted from the wav header. */
  36 struct check_wav_task {
  37         int state;
  38         /** Number of channels. */
  39         unsigned channels;
  40         unsigned sample_format;
  41         /** Sample rate specified in wav header given by \a buf. */
  42         unsigned sample_rate;
  43         /** The task structure used by the scheduler. */
  44         struct task task;
  45         struct btr_node *btrn;
  46         size_t min_iqs;
  47 };
  48
  49 static struct write_args_info conf;
  50
  51 static struct stdin_task sit;
  52
  53 /** Length of a standard wav header. */
  54 #define WAV_HEADER_LEN 44
  55
  56 static void check_wav_pre_select(struct sched *s, struct task *t)
  57 {
  58         struct check_wav_task *cwt = container_of(t, struct check_wav_task, task);
  59         int ret;
  60
  61         ret = btr_node_status(cwt->btrn, cwt->min_iqs, BTR_NT_INTERNAL);
  62         if (ret != 0)
  63                 sched_min_delay(s);
  64 }
  65
  66 #define HANDLE_EXEC(_cmd) \
  67         if (!strcmp(cmd, #_cmd)) { \
  68                 if (!conf._cmd ## _given && cwt->state == CWS_NEED_HEADER) \
  69                         return -E_BTR_NAVAIL; \
  70                 *result = make_message("%d", cwt->state == CWS_NO_HEADER || conf._cmd ## _given? \
  71                         conf._cmd ## _arg : cwt->_cmd); \
  72                 return 1; \
  73         } \
  74
  75
  76 static int check_wav_exec(struct btr_node *btrn, const char *cmd, char **result)
  77 {
  78         struct check_wav_task *cwt = btr_context(btrn);
  79
  80         HANDLE_EXEC(sample_rate);
  81         HANDLE_EXEC(channels);
  82         HANDLE_EXEC(sample_format);
  83         return -ERRNO_TO_PARA_ERROR(ENOTSUP);
  84 }
  85
  86 static void check_wav_post_select(__a_unused struct sched *s, struct task *t)
  87 {
  88         struct check_wav_task *cwt = container_of(t, struct check_wav_task, task);
  89         struct btr_node *btrn = cwt->btrn;
  90         unsigned char *a;
  91         size_t sz;
  92         int ret;
  93         uint16_t bps; /* bits per sample */
  94         const char *sample_formats[] = {SAMPLE_FORMATS};
  95
  96         t->error = 0;
  97         ret = btr_node_status(btrn, cwt->min_iqs, BTR_NT_INTERNAL);
  98         if (ret <= 0)
  99                 goto out;
 100         if (cwt->state != CWS_NEED_HEADER)
 101                 goto pushdown;
 102         btr_merge(btrn, cwt->min_iqs);
 103         sz = btr_next_buffer(btrn, (char **)&a);
 104         if (sz < cwt->min_iqs) /* file size less than WAV_HEADER_SIZE */
 105                 goto pushdown;
 106         cwt->min_iqs = 0;
 107         /*
 108          * The default byte ordering assumed for WAVE data files is
 109          * little-endian. Files written using the big-endian byte ordering
 110          * scheme have the identifier RIFX instead of RIFF.
 111          */
 112         if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' ||
 113                         (a[3] != 'F' && a[3] != 'X')) {
 114                 PARA_NOTICE_LOG("wav header not found\n");
 115                 cwt->state = CWS_NO_HEADER;
 116                 sprintf(t->status, "check wav: no header");
 117                 goto out;
 118         }
 119         PARA_INFO_LOG("found wav header\n");
 120         cwt->state = CWS_HAVE_HEADER;
 121         sprintf(t->status, "check wav: have header");
 122         cwt->channels = (unsigned) a[22];
 123         cwt->sample_rate = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
 124         bps = a[34] + ((unsigned)a[35] << 8);
 125         if (bps != 8 && bps != 16) {
 126                 PARA_WARNING_LOG("%u bps not supported, assuming 16\n", bps);
 127                 bps = 16;
 128         }
 129         /*
 130          * 8-bit samples are stored as unsigned bytes, ranging from 0 to 255.
 131          * 16-bit samples are stored as 2's-complement signed integers, ranging
 132          * from -32768 to 32767.
 133          */
 134         if (bps == 8)
 135                 cwt->sample_format = SF_U8;
 136         else
 137                 cwt->sample_format = (a[3] == 'F')? SF_S16_LE : SF_S16_BE;
 138         PARA_NOTICE_LOG("%dHz, %s, %s\n", cwt->sample_rate,
 139                 cwt->channels == 1? "mono" : "stereo",
 140                 sample_formats[cwt->sample_format]);
 141         btr_consume(btrn, WAV_HEADER_LEN);
 142 pushdown:
 143         btr_pushdown(btrn);
 144 out:
 145         t->error = ret;
 146         if (ret < 0)
 147                 btr_remove_node(btrn);
 148 }
 149
 150 static int loglevel;
 151 INIT_STDERR_LOGGING(loglevel)
 152
 153 __noreturn static void print_help_and_die(void)
 154 {
 155         int d = conf.detailed_help_given;
 156         const char **p = d? write_args_info_detailed_help
 157                 : write_args_info_help;
 158
 159         printf_or_die("%s\n\n", WRITE_CMDLINE_PARSER_PACKAGE "-"
 160                 WRITE_CMDLINE_PARSER_VERSION);
 161         printf_or_die("%s\n\n", write_args_info_usage);
 162         for (; *p; p++)
 163                 printf_or_die("%s\n", *p);
 164         print_writer_helps(d);
 165         exit(0);
 166 }
 167
 168 /*
 169  * Parse config and register a task for a writer node.
 170  *
 171  * \param arg Command line arguments.
 172  * \param parent The new node will be a child of \a parent.
 173  * \param wn The writer node.
 174  *
 175  * If arg is \p NULL, the OS-dependent default writer is used with no
 176  * arguments.  The default writers are alsa for Linux, osx for OS X, oss for
 177  * *BSD, and the file writer if the default writer is not supported.
 178  *
 179  * Once the writer configuration has been retrieved from the ->parse_config
 180  * callback a writer node is created, its buffer tree node is added to the
 181  * buffer tree as a child of the given parent.
 182  *
 183  * Finally, the new writer node's task structure is initialized and registered
 184  * to the paraslash scheduler.
 185  *
 186  * \return Standard.
 187  */
 188 static void setup_writer_node(const char *arg, struct btr_node *parent,
 189                 struct writer_node *wn, struct sched *s)
 190 {
 191         if (arg)
 192                 wn->conf = check_writer_arg_or_die(arg, &wn->writer_num);
 193         else {
 194                 wn->writer_num = DEFAULT_WRITER;
 195                 wn->conf = writers[DEFAULT_WRITER].parse_config_or_die("");
 196         }
 197         register_writer_node(wn, parent, s);
 198 }
 199
 200 static int setup_and_schedule(void)
 201 {
 202         int i, ret;
 203         struct check_wav_task _cwt, *cwt = &_cwt;
 204         struct writer_node *wns;
 205         static struct sched s;
 206
 207         loglevel = get_loglevel_by_name(conf.loglevel_arg);
 208         sit.btrn = btr_new_node(&(struct btr_node_description)
 209                 EMBRACE(.name = "stdin"));
 210         stdin_set_defaults(&sit);
 211         register_task(&s, &sit.task);
 212
 213         cwt->state = CWS_NEED_HEADER;
 214         cwt->min_iqs = WAV_HEADER_LEN;
 215         cwt->btrn = btr_new_node(&(struct btr_node_description)
 216                 EMBRACE(.name = "check_wav", .parent = sit.btrn,
 217                 .handler = check_wav_exec, .context = cwt));
 218         sprintf(cwt->task.status, "check_wav");
 219         cwt->task.pre_select = check_wav_pre_select;
 220         cwt->task.post_select = check_wav_post_select;
 221         cwt->task.error = 0;
 222         register_task(&s, &cwt->task);
 223
 224         if (!conf.writer_given) {
 225                 wns = para_calloc(sizeof(*wns));
 226                 setup_writer_node(NULL, cwt->btrn, wns, &s);
 227                 i = 1;
 228         } else {
 229                 wns = para_calloc(conf.writer_given * sizeof(*wns));
 230                 for (i = 0; i < conf.writer_given; i++)
 231                         setup_writer_node(conf.writer_arg[i], cwt->btrn,
 232                                 wns + i, &s);
 233         }
 234
 235         s.default_timeout.tv_sec = 10;
 236         s.default_timeout.tv_usec = 50000;
 237         ret = schedule(&s);
 238         if (ret >= 0) {
 239                 int j;
 240                 for (j = 0; j < i; j++) {
 241                         struct task *t = &wns[j].task;
 242                         assert(t->error < 0);
 243                         if (t->error != -E_WRITE_COMMON_EOF
 244                                         && t->error != -E_BTR_EOF) {
 245                                 PARA_ERROR_LOG("%s: %s\n", t->status,
 246                                         para_strerror(-t->error));
 247                                 if (ret >= 0)
 248                                         ret = t->error;
 249                         }
 250                 }
 251         }
 252         for (i--; i >= 0; i--) {
 253                 struct writer_node *wn = wns + i;
 254                 struct writer *w = writers + wn->writer_num;
 255
 256                 w->close(wn);
 257                 btr_free_node(wn->btrn);
 258                 w->free_config(wn->conf);
 259                 free(wn->conf);
 260         }
 261         free(wns);
 262         btr_free_node(cwt->btrn);
 263         return ret;
 264 }
 265
 266 /**
 267  * Para_write's main function.
 268  *
 269  * \param argc The usual argument counter.
 270  * \param argv The usual argument vector.
 271  *
 272  * It sets up and starts the tasks and the buffer tree nodes determined by
 273  * command line options.
 274  *
 275  * \return \p EXIT_SUCCESS or EXIT_FAILURE
 276  */
 277 int main(int argc, char *argv[])
 278 {
 279         int ret;
 280
 281         writer_init();
 282         write_cmdline_parser(argc, argv, &conf);
 283         HANDLE_VERSION_FLAG("write", conf);
 284         if (conf.help_given || conf.detailed_help_given)
 285                 print_help_and_die();
 286
 287         ret = setup_and_schedule();
 288         if (ret < 0) {
 289                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 290                 exit(EXIT_FAILURE);
 291         }
 292         exit(EXIT_SUCCESS);
 293 }