gcc-compat.h: rename __unused to __a_unused
[paraslash.git] / 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
32 enum { E_BROKEN_CONF, /* Broken configuration for this PCM */
33 E_ACCESS_TYPE, /* Access type not available */
34 E_SAMPLE_FORMAT, /* Sample format not available */
35 E_CHANNEL_COUNT, /* Channels count not available */
36 E_HW_PARAMS, /* Unable to install hw params */
37 E_SW_PARAMS, /* Unable to install sw params */
38 E_BAD_PERIOD, /* Can't use period equal to buffer size */
39 E_GET_XFER, /* Unable to obtain xfer align */
40 E_SET_XFER, /* snd_pcm_sw_params_set_xfer_align failed */
41 E_MEM, /* not enough memory */
42 E_READ, /* read error */
43 E_WRITE, /* write error */
44 E_PIPE, /* write to pipe with other side closed */
45 E_PCM_OPEN, /* unable to open pcm */
46 E_SND_PCM_INFO, /* pcm info error */
47 E_GET_BUFFER_TIME, /* snd_pcm_hw_params_get_buffer_time_max failed */
48 E_SET_BUFFER_TIME, /* snd_pcm_hw_params_set_buffer_time_near failed */
49 E_SET_RATE, /* snd_pcm_hw_params_set_rate_near failed */
50 E_START_THRESHOLD, /* snd_pcm_sw_params_set_start_threshold failed */
51 E_STOP_THRESHOLD, /* snd_pcm_sw_params_set_stop_threshold failed */
52 E_LOG, /* snd_output_stdio_attach failed */
53 E_SYNTAX /* could not parse start_time option */
54 };
55
56 #define FORMAT SND_PCM_FORMAT_S16_LE
57
58 #define EXIT(EXP) \
59 do { if (EXP) \
60 fprintf (stderr, "error: " #EXP "\n"); exit(EXP);} \
61 while (0)
62
63 static snd_pcm_t *handle;
64 static unsigned char *audiobuf;
65 static snd_pcm_uframes_t chunk_size;
66 static size_t bytes_per_frame;
67 static struct timeval *start_time;
68 static struct gengetopt_args_info conf;
69
70 void para_log(__a_unused int ll, const char* fmt,...)
71 {
72 va_list argp;
73
74 va_start(argp, fmt);
75 vfprintf(stderr, fmt, argp);
76 va_end(argp);
77 }
78
79 /*
80 * read_wav_header - read WAV_HEADER_LEN bytes from stdin to audio buffer
81 *
82 * Exit on errors and on eof before WAV_HEADER_LEN could be read.
83 */
84 static void read_wav_header(void)
85 {
86 ssize_t ret, count = 0;
87
88 while (count < WAV_HEADER_LEN) {
89 ret = read(STDIN_FILENO, audiobuf + count, WAV_HEADER_LEN - count);
90 if (ret <= 0)
91 EXIT(E_READ);
92 count += ret;
93 }
94 }
95
96 /*
97 * set_alsa_params - Prepare the PCM handle for writing
98 *
99 * Install PCM software and hardware configuration. Exit on errors.
100 */
101 static void set_alsa_params(void)
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
110 snd_pcm_hw_params_alloca(&hwparams);
111 snd_pcm_sw_params_alloca(&swparams);
112 if (snd_pcm_hw_params_any(handle, hwparams) < 0)
113 EXIT(E_BROKEN_CONF);
114 if (snd_pcm_hw_params_set_access(handle, hwparams,
115 SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
116 EXIT(E_ACCESS_TYPE);
117 if (snd_pcm_hw_params_set_format(handle, hwparams, FORMAT) < 0)
118 EXIT(E_SAMPLE_FORMAT);
119 if (snd_pcm_hw_params_set_channels(handle, hwparams, conf.channels_arg) < 0)
120 EXIT(E_CHANNEL_COUNT);
121 if (snd_pcm_hw_params_set_rate_near(handle, hwparams,
122 (unsigned int*) &conf.sample_rate_arg, 0) < 0)
123 EXIT(E_SET_RATE);
124 err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time, 0);
125 if (err < 0 || !buffer_time)
126 EXIT(E_GET_BUFFER_TIME);
127 PARA_DEBUG_LOG("buffer time: %d\n", buffer_time);
128 if (snd_pcm_hw_params_set_buffer_time_near(handle, hwparams,
129 &buffer_time, 0) < 0)
130 EXIT(E_SET_BUFFER_TIME);
131 if (snd_pcm_hw_params(handle, hwparams) < 0)
132 EXIT(E_HW_PARAMS);
133 snd_pcm_hw_params_get_period_size(hwparams, &chunk_size, 0);
134 snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
135 PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size, chunk_size);
136 if (chunk_size == buffer_size)
137 EXIT(E_BAD_PERIOD);
138 snd_pcm_sw_params_current(handle, swparams);
139 err = snd_pcm_sw_params_get_xfer_align(swparams, &xfer_align);
140 if (err < 0 || !xfer_align)
141 EXIT(E_GET_XFER);
142 // snd_pcm_sw_params_set_sleep_min(handle, swparams, 0);
143 snd_pcm_sw_params_set_avail_min(handle, swparams, chunk_size);
144 /* round to closest transfer boundary */
145 start_threshold = (buffer_size / xfer_align) * xfer_align;
146 if (start_threshold < 1)
147 start_threshold = 1;
148 if (snd_pcm_sw_params_set_start_threshold(handle, swparams,
149 start_threshold) < 0)
150 EXIT(E_START_THRESHOLD);
151 stop_threshold = buffer_size;
152 if (snd_pcm_sw_params_set_stop_threshold(handle, swparams,
153 stop_threshold) < 0)
154 EXIT(E_STOP_THRESHOLD);
155 if (snd_pcm_sw_params_set_xfer_align(handle, swparams, xfer_align) < 0)
156 EXIT(E_SET_XFER);
157 if (snd_pcm_sw_params(handle, swparams) < 0)
158 EXIT(E_SW_PARAMS);
159 bytes_per_frame = snd_pcm_format_physical_width(FORMAT) * conf.channels_arg / 8;
160 }
161
162 /*
163 * pcm_write - push out pcm frames
164 * \param data pointer do data to be written
165 * \param count number of frames
166 *
167 * \return Number of bytes written. Exit on errors.
168 */
169 static snd_pcm_sframes_t pcm_write(u_char *data, size_t count)
170 {
171 snd_pcm_sframes_t r, result = 0;
172 while (count > 0) {
173 /* write interleaved frames */
174 r = snd_pcm_writei(handle, data, count);
175 if (r < 0)
176 PARA_ERROR_LOG("write error: %s\n", snd_strerror(r));
177 if (r == -EAGAIN || (r >= 0 && r < count))
178 snd_pcm_wait(handle, 1);
179 else if (r == -EPIPE)
180 snd_pcm_prepare(handle);
181 else if (r < 0)
182 EXIT(E_WRITE);
183 if (r > 0) {
184 result += r;
185 count -= r;
186 data += r * bytes_per_frame;
187 }
188 }
189 return result;
190 }
191
192 /*
193 * start_time_in_future - check if current time is later than start_time
194 * \param diff pointer to write remaining time to
195 *
196 * If start_time was not given, or current time is later than given
197 * start_time, return 0. Otherwise, return 1 and write the time
198 * difference between current time and start_time to diff. diff may be
199 * NULL.
200 *
201 */
202 static int start_time_in_future(struct timeval *diff)
203 {
204 struct timeval now;
205
206 if (!conf.start_time_given)
207 return 0;
208 gettimeofday(&now, NULL);
209 return tv_diff(start_time, &now, diff) > 0? 1 : 0;
210 }
211
212 /*
213 * do_initial_delay - sleep until time given at command line
214 *
215 * This is called if the initial buffer is filled. It returns
216 * immediately if no start_time was given at the command line
217 * or if the given start time is in the past.
218 *
219 */
220 static void do_initial_delay(struct timeval *delay)
221 {
222 do
223 para_select(1, NULL, NULL, delay);
224 while (start_time_in_future(delay));
225 }
226
227 /*
228 * play_pcm - play raw pcm data
229 * \param loaded number of bytes already loaded
230 *
231 * If start_time was given, prebuffer data until buffer is full or
232 * start_time is reached. In any case, do not start playing before
233 * start_time.
234 */
235 static void play_pcm(size_t loaded)
236 {
237 size_t chunk_bytes, bufsize, written = 0, prebuf_size;
238 ssize_t ret;
239 unsigned char *p;
240 struct timeval delay;
241
242 set_alsa_params();
243 chunk_bytes = chunk_size * bytes_per_frame;
244 bufsize = (conf.bufsize_arg * 1024 / chunk_bytes) * chunk_bytes;
245 audiobuf = realloc(audiobuf, bufsize);
246 if (!audiobuf)
247 EXIT(E_MEM);
248 prebuf_size = conf.prebuffer_arg * bufsize / 100;
249 again:
250 if (!written) {
251 if (loaded < prebuf_size)
252 goto read;
253 if (start_time && start_time_in_future(&delay)) {
254 do_initial_delay(&delay);
255 start_time = NULL;
256 }
257 }
258 p = audiobuf;
259 while (loaded >= chunk_bytes) {
260 ret = pcm_write(p, chunk_size) * bytes_per_frame;
261 p += ret;
262 written += ret;
263 loaded -= ret;
264 }
265 if (loaded && p != audiobuf)
266 memcpy(audiobuf, p, loaded);
267 read:
268 ret = read(STDIN_FILENO, audiobuf + loaded, bufsize - loaded);
269 if (ret < 0)
270 EXIT(E_READ);
271 if (ret) {
272 loaded += ret;
273 goto again;
274 }
275 snd_pcm_drain(handle);
276 }
277
278 /*
279 * check_wave - test if audio buffer contains a valid wave header
280 *
281 * If not, return 0, otherwise, store number of channels and sample rate
282 * in struct conf and return WAV_HEADER_LEN.
283 */
284 static size_t check_wave(void)
285 {
286 unsigned char *a = audiobuf;
287 if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' || a[3] != 'F')
288 return WAV_HEADER_LEN;
289 conf.channels_arg = (unsigned) a[22];
290 conf.sample_rate_arg = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
291 return 0;
292 }
293
294 int main(int argc, char *argv[])
295 {
296 snd_pcm_info_t *info;
297 snd_output_t *log;
298 struct timeval tv;
299 int err;
300
301 cmdline_parser(argc, argv, &conf);
302 if (conf.start_time_given) {
303 if (sscanf(conf.start_time_arg, "%lu:%lu",
304 &tv.tv_sec, &tv.tv_usec) != 2)
305 EXIT(E_SYNTAX);
306 start_time = &tv;
307 }
308 snd_pcm_info_alloca(&info);
309 if (snd_output_stdio_attach(&log, stderr, 0) < 0)
310 EXIT(E_LOG);
311 err = snd_pcm_open(&handle, conf.device_arg,
312 SND_PCM_STREAM_PLAYBACK, 0);
313 if (err < 0)
314 EXIT(E_PCM_OPEN);
315 if ((err = snd_pcm_info(handle, info)) < 0)
316 EXIT(E_SND_PCM_INFO);
317 audiobuf = malloc(WAV_HEADER_LEN);
318 read_wav_header();
319 play_pcm(check_wave());
320 snd_pcm_close(handle);
321 free(audiobuf);
322 // snd_output_close(log);
323 snd_config_update_free_global();
324 return EXIT_SUCCESS;
325 }