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