play.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 /*
  20  * Based in parts on aplay.c from the alsa-utils-1.0.8 package,
  21  * Copyright (c) by Jaroslav Kysela <perex@suse.cz>, which is
  22  * based on the vplay program by Michael Beck.
  23  */
  24
  25 #define WAV_HEADER_LEN 44
  26 #include <sys/time.h> /* gettimeofday */
  27 #include "para.h"
  28 #include "fd.h"
  29 #include "play.cmdline.h"
  30 #include <alsa/asoundlib.h>
  31 #include "string.h"
  32 #include "error.h"
  33
  34 #define FORMAT SND_PCM_FORMAT_S16_LE
  35
  36 struct private_alsa_data {
  37         snd_pcm_t *handle;
  38         size_t bytes_per_frame;
  39 };
  40
  41 struct writer_node {
  42         struct writer *writer;
  43         void *private_data;
  44         int chunk_bytes;
  45 };
  46
  47 struct writer {
  48         int (*open)(struct writer_node *);
  49         int (*write)(char *data, size_t nbytes, struct writer_node *);
  50         void (*close)(struct writer_node *);
  51         void (*shutdown)(struct writer_node *);
  52 };
  53
  54 struct writer_node_group {
  55         unsigned num_writers;
  56         struct writer_node *writer_nodes;
  57         int *written;
  58         size_t max_chunk_bytes;
  59         int eof;
  60 };
  61
  62
  63 #define FOR_EACH_WRITER_NODE(i, wng) for (i = 0; i < (wng)->num_writers; i++)
  64
  65 #define NUM_WRITERS 1
  66 static struct writer writers[NUM_WRITERS];
  67 #define FOR_EACH_WRITER(i) for (i = 0; i < NUM_WRITERS, i++)
  68
  69
  70 static unsigned char *audiobuf;
  71 static struct timeval *start_time;
  72 static struct gengetopt_args_info conf;
  73
  74 INIT_PLAY_ERRLISTS;
  75
  76 void para_log(int ll, const char* fmt,...)
  77 {
  78         va_list argp;
  79
  80         if (ll < conf.loglevel_arg)
  81                 return;
  82         va_start(argp, fmt);
  83         vfprintf(stderr, fmt, argp);
  84         va_end(argp);
  85 }
  86
  87 /**
  88  * read WAV_HEADER_LEN bytes from stdin to audio buffer
  89  *
  90  * \return -E_READ_HDR on errors and on eof before WAV_HEADER_LEN could be
  91  * read. A positive return value indicates success.
  92  */
  93 static int read_wav_header(void)
  94 {
  95         ssize_t ret, count = 0;
  96
  97         while (count < WAV_HEADER_LEN) {
  98                 ret = read(STDIN_FILENO, audiobuf + count, WAV_HEADER_LEN - count);
  99                 if (ret <= 0)
 100                         return -E_READ_HDR;
 101                 count += ret;
 102         }
 103         return 1;
 104 }
 105
 106 /*
 107  * open and prepare the PCM handle for writing
 108  *
 109  * Install PCM software and hardware configuration. Exit on errors.
 110  */
 111 static int alsa_open(struct writer_node *w)
 112 {
 113         snd_pcm_hw_params_t *hwparams;
 114         snd_pcm_sw_params_t *swparams;
 115         snd_pcm_uframes_t buffer_size, xfer_align, start_threshold,
 116                 stop_threshold;
 117         unsigned buffer_time = 0;
 118         int err;
 119         snd_pcm_info_t *info;
 120         snd_output_t *log;
 121         snd_pcm_uframes_t period_size;
 122         struct private_alsa_data *pad = para_malloc(sizeof(struct private_alsa_data));
 123         w->private_data = pad;
 124
 125         snd_pcm_info_alloca(&info);
 126         if (snd_output_stdio_attach(&log, stderr, 0) < 0)
 127                 return -E_ALSA_LOG;
 128         err = snd_pcm_open(&pad->handle, conf.device_arg,
 129                 SND_PCM_STREAM_PLAYBACK, 0);
 130         if (err < 0)
 131                 return -E_PCM_OPEN;
 132         if ((err = snd_pcm_info(pad->handle, info)) < 0)
 133                 return -E_SND_PCM_INFO;
 134
 135         snd_pcm_hw_params_alloca(&hwparams);
 136         snd_pcm_sw_params_alloca(&swparams);
 137         if (snd_pcm_hw_params_any(pad->handle, hwparams) < 0)
 138                 return -E_BROKEN_CONF;
 139         if (snd_pcm_hw_params_set_access(pad->handle, hwparams,
 140                         SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
 141                 return -E_ACCESS_TYPE;
 142         if (snd_pcm_hw_params_set_format(pad->handle, hwparams, FORMAT) < 0)
 143                 return -E_SAMPLE_FORMAT;
 144         if (snd_pcm_hw_params_set_channels(pad->handle, hwparams,
 145                         conf.channels_arg) < 0)
 146                 return -E_CHANNEL_COUNT;
 147         if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
 148                         (unsigned int*) &conf.sample_rate_arg, 0) < 0)
 149                 return -E_SET_RATE;
 150         err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time, 0);
 151         if (err < 0 || !buffer_time)
 152                 return -E_GET_BUFFER_TIME;
 153         PARA_DEBUG_LOG("buffer time: %d\n", buffer_time);
 154         if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
 155                         &buffer_time, 0) < 0)
 156                 return -E_SET_BUFFER_TIME;
 157         if (snd_pcm_hw_params(pad->handle, hwparams) < 0)
 158                 return -E_HW_PARAMS;
 159         snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0);
 160         snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
 161         PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size,
 162                 period_size);
 163         if (period_size == buffer_size)
 164                 return -E_BAD_PERIOD;
 165         snd_pcm_sw_params_current(pad->handle, swparams);
 166         err = snd_pcm_sw_params_get_xfer_align(swparams, &xfer_align);
 167         if (err < 0 || !xfer_align)
 168                 return -E_GET_XFER;
 169         snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
 170         /* round to closest transfer boundary */
 171         start_threshold = (buffer_size / xfer_align) * xfer_align;
 172         if (start_threshold < 1)
 173                 start_threshold = 1;
 174         if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
 175                         start_threshold) < 0)
 176                 return -E_START_THRESHOLD;
 177         stop_threshold = buffer_size;
 178         if (snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
 179                         stop_threshold) < 0)
 180                 return -E_STOP_THRESHOLD;
 181         if (snd_pcm_sw_params_set_xfer_align(pad->handle, swparams,
 182                         xfer_align) < 0)
 183                 return -E_SET_XFER;
 184         if (snd_pcm_sw_params(pad->handle, swparams) < 0)
 185                 return -E_SW_PARAMS;
 186         pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
 187                 * conf.channels_arg / 8;
 188         return period_size * pad->bytes_per_frame;
 189 }
 190
 191 /**
 192  * push out pcm frames
 193  * \param data pointer do data to be written
 194  * \param nbytes number of bytes (not frames)
 195  *
 196  * \return Number of bytes written, -E_ALSA_WRITE on errors.
 197  */
 198 static int alsa_write(char *data, size_t nbytes, struct writer_node *wn)
 199 {
 200         struct private_alsa_data *pad = wn->private_data;
 201         size_t frames = nbytes / pad->bytes_per_frame;
 202         unsigned char *d = data;
 203         snd_pcm_sframes_t r, result = 0;
 204
 205         while (frames > 0) {
 206                 /* write interleaved frames */
 207                 r = snd_pcm_writei(pad->handle, d, frames);
 208                 if (r < 0)
 209                         PARA_ERROR_LOG("write error: %s\n", snd_strerror(r));
 210                 if (r == -EAGAIN || (r >= 0 && r < frames))
 211                         snd_pcm_wait(pad->handle, 1);
 212                 else if (r == -EPIPE)
 213                         snd_pcm_prepare(pad->handle);
 214                 else if (r < 0)
 215                         return -E_ALSA_WRITE;
 216                 if (r > 0) {
 217                         result += r;
 218                         frames -= r;
 219                         d += r * pad->bytes_per_frame;
 220                 }
 221         }
 222         return result * pad->bytes_per_frame;
 223 }
 224
 225 static void alsa_close(struct writer_node *wn)
 226 {
 227         struct private_alsa_data *pad = wn->private_data;
 228         snd_pcm_drain(pad->handle);
 229         snd_pcm_close(pad->handle);
 230         snd_config_update_free_global();
 231         free(pad);
 232 }
 233
 234 void alsa_writer_init(struct writer *w)
 235 {
 236         w->open = alsa_open;
 237         w->write = alsa_write;
 238         w->close = alsa_close;
 239         w->shutdown = NULL; /* nothing to do */
 240 }
 241
 242
 243 /**
 244  * check if current time is later than start_time
 245  * \param diff pointer to write remaining time to
 246  *
 247  * If start_time was not given, or current time is later than given
 248  * start_time, return 0. Otherwise, return 1 and write the time
 249  * difference between current time and start_time to diff. diff may be
 250  * NULL.
 251  *
 252  */
 253 static int start_time_in_future(struct timeval *diff)
 254 {
 255         struct timeval now;
 256
 257         if (!conf.start_time_given)
 258                 return 0;
 259         gettimeofday(&now, NULL);
 260         return tv_diff(start_time, &now, diff) > 0? 1 : 0;
 261 }
 262
 263 /**
 264  * sleep until time given at command line
 265  *
 266  * This is called if the initial buffer is filled. It returns
 267  * immediately if no start_time was given at the command line
 268  * or if the given start time is in the past.
 269  *
 270  */
 271 static void do_initial_delay(struct timeval *delay)
 272 {
 273         do
 274                 para_select(1, NULL, NULL, delay);
 275         while (start_time_in_future(delay));
 276 }
 277
 278 static int read_stdin(char *buf, size_t bytes_to_load, size_t *loaded)
 279 {
 280         ssize_t ret;
 281
 282         while (*loaded < bytes_to_load) {
 283                 ret = read(STDIN_FILENO, buf + *loaded, bytes_to_load - *loaded);
 284                 if (ret <= 0) {
 285                         if (ret < 0)
 286                                 ret = -E_READ_STDIN;
 287                         return ret;
 288                 }
 289                 *loaded += ret;
 290         }
 291         return 1;
 292 }
 293
 294 int wng_write(struct writer_node_group *g, char *buf, size_t *loaded)
 295 {
 296         int ret, i, need_more_writes = 1;
 297         size_t min_written = 0;
 298
 299         while (need_more_writes) {
 300                 need_more_writes = 0;
 301                 FOR_EACH_WRITER_NODE(i, g) {
 302                         size_t w = g->written[i];
 303                         unsigned char *p = buf + w;
 304                         int bytes_to_write;
 305                         struct writer_node *wn = &g->writer_nodes[i];
 306                         if (!i)
 307                                 min_written = w;
 308                         else
 309                                 min_written = PARA_MIN(min_written, w);
 310                         if (w == *loaded)
 311                                 continue;
 312                         if (!g->eof && (*loaded < wn->chunk_bytes + w))
 313                                 continue;
 314                         bytes_to_write = PARA_MIN(wn->chunk_bytes,
 315                                 *loaded - w);
 316                         ret = wn->writer->write(p, bytes_to_write, wn);
 317                         if (ret < 0)
 318                                 goto out;
 319                         if (ret != bytes_to_write)
 320                                 PARA_WARNING_LOG("short write: %d/%d\n", ret,
 321                                         bytes_to_write);
 322                         g->written[i] += ret;
 323                         need_more_writes = 1;
 324                 }
 325         }
 326         *loaded -= min_written;
 327         ret = 0;
 328         if (g->eof)
 329                 goto out;
 330         if (*loaded)
 331                 memmove(buf, buf + min_written, *loaded);
 332         FOR_EACH_WRITER_NODE(i, g)
 333                 g->written[i] -= min_written;
 334         ret = 1;
 335 out:
 336         return ret;
 337 }
 338
 339 int wng_open(struct writer_node_group *g)
 340 {
 341         int i, ret = 1;
 342
 343         FOR_EACH_WRITER_NODE(i, g) {
 344                 struct writer_node *wn = &g->writer_nodes[i];
 345                 ret = wn->writer->open(wn);
 346                 if (ret < 0)
 347                         goto out;
 348                 wn->chunk_bytes = ret;
 349                 g->max_chunk_bytes = PARA_MAX(g->max_chunk_bytes, ret);
 350         }
 351 out:
 352         return ret;
 353 }
 354
 355 void wng_close(struct writer_node_group *g)
 356 {
 357         int i;
 358
 359         FOR_EACH_WRITER_NODE(i, g) {
 360                 struct writer_node *wn = &g->writer_nodes[i];
 361                 wn->writer->close(wn);
 362         }
 363 }
 364
 365 /**
 366  * play raw pcm data
 367  * \param loaded number of bytes already loaded
 368  *
 369  * If start_time was given, prebuffer data until buffer is full or
 370  * start_time is reached. In any case, do not start playing before
 371  * start_time.
 372  *
 373  * \return positive on success, negative on errors.
 374  */
 375 static int pcm_write(struct writer_node_group *wng, size_t loaded)
 376 {
 377         size_t bufsize, prebuf_size, bytes_to_load;
 378         struct timeval delay;
 379         int ret, not_yet_started = 1;
 380
 381         ret = wng_open(wng);
 382         if (ret < 0)
 383                 goto out;
 384         PARA_INFO_LOG("max chunk_bytes: %d\n", wng->max_chunk_bytes);
 385         bufsize = (conf.bufsize_arg * 1024 / wng->max_chunk_bytes)
 386                 * wng->max_chunk_bytes;
 387         audiobuf = para_realloc(audiobuf, bufsize);
 388         prebuf_size = conf.prebuffer_arg * bufsize / 100;
 389         bytes_to_load =  PARA_MAX(prebuf_size, wng->max_chunk_bytes);
 390         ret = read_stdin(audiobuf, bytes_to_load, &loaded);
 391         if (ret <= 0 || loaded < bytes_to_load) {
 392                 if (ret >= 0)
 393                         ret = -E_PREMATURE_END;
 394                 goto out;
 395         }
 396         if (not_yet_started && start_time && start_time_in_future(&delay))
 397                 do_initial_delay(&delay);
 398         not_yet_started = 0;
 399 again:
 400         ret = wng_write(wng, audiobuf, &loaded);
 401         if (ret <= 0)
 402                 goto out;
 403         ret = -E_PLAY_OVERRUN;
 404         if (loaded >= bufsize)
 405                 goto out;
 406         bytes_to_load = PARA_MIN(wng->max_chunk_bytes, bufsize);
 407         ret = read_stdin(audiobuf, bytes_to_load, &loaded);
 408         if (ret < 0)
 409                 goto out;
 410         if (!ret)
 411                 wng->eof = 1;
 412         goto again;
 413 out:
 414         wng_close(wng);
 415         return ret;
 416 }
 417
 418 struct writer_node_group *wng_new(unsigned num_writers)
 419 {
 420         struct writer_node_group *g = para_calloc(sizeof(struct writer_node_group));
 421         g->num_writers = num_writers;
 422         g->writer_nodes = para_calloc(num_writers
 423                 * sizeof(struct writer_node));
 424         g->written = para_calloc(num_writers * sizeof(size_t));
 425         return g;
 426 }
 427
 428 void wng_destroy(struct writer_node_group *g)
 429 {
 430         if (!g)
 431                 return;
 432         free(g->written);
 433         free(g->writer_nodes);
 434         free(g);
 435 }
 436
 437 /**
 438  * test if audio buffer contains a valid wave header
 439  *
 440  * \return If not, return 0, otherwise, store number of channels and sample rate
 441  * in struct conf and return WAV_HEADER_LEN.
 442  */
 443 static size_t check_wave(void)
 444 {
 445         unsigned char *a = audiobuf;
 446         if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' || a[3] != 'F')
 447                 return WAV_HEADER_LEN;
 448         conf.channels_arg = (unsigned) a[22];
 449         conf.sample_rate_arg = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
 450         return 0;
 451 }
 452
 453 int main(int argc, char *argv[])
 454 {
 455         struct timeval tv;
 456         int ret = -E_PLAY_SYNTAX;
 457         struct writer_node_group *wng = NULL;
 458
 459         cmdline_parser(argc, argv, &conf);
 460         if (conf.prebuffer_arg < 0 || conf.prebuffer_arg > 100)
 461                 goto out;
 462         if (conf.start_time_given) {
 463                 if (sscanf(conf.start_time_arg, "%lu:%lu",
 464                                 &tv.tv_sec, &tv.tv_usec) != 2)
 465                         goto out;
 466                 start_time = &tv;
 467         }
 468         /* call init for each supported writer */
 469         alsa_writer_init(&writers[0]);
 470
 471         wng = wng_new(1);
 472         wng->writer_nodes[0].writer = &writers[0]; /* alsa */
 473
 474         audiobuf = para_malloc(WAV_HEADER_LEN);
 475         ret = read_wav_header();
 476         if (ret < 0)
 477                 goto out;
 478         ret = pcm_write(wng, check_wave());
 479 out:
 480         wng_destroy(wng);
 481         free(audiobuf);
 482         if (ret < 0)
 483                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 484         return ret;
 485 }