a7bea9fa1ef7e195a247da6a5c76ad1d9adaa83a
[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 #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 static unsigned char *audiobuf;
42 static struct timeval *start_time;
43 static struct gengetopt_args_info conf;
44
45 INIT_PLAY_ERRLISTS;
46
47 void para_log(__a_unused int ll, const char* fmt,...)
48 {
49 va_list argp;
50
51 va_start(argp, fmt);
52 vfprintf(stderr, fmt, argp);
53 va_end(argp);
54 }
55
56 /**
57 * read WAV_HEADER_LEN bytes from stdin to audio buffer
58 *
59 * \return -E_READ_HDR on errors and on eof before WAV_HEADER_LEN could be
60 * read. A positive return value indicates success.
61 */
62 static int read_wav_header(void)
63 {
64 ssize_t ret, count = 0;
65
66 while (count < WAV_HEADER_LEN) {
67 ret = read(STDIN_FILENO, audiobuf + count, WAV_HEADER_LEN - count);
68 if (ret <= 0)
69 return -E_READ_HDR;
70 count += ret;
71 }
72 return 1;
73 }
74
75 /*
76 * open and prepare the PCM handle for writing
77 *
78 * Install PCM software and hardware configuration. Exit on errors.
79 */
80 static int alsa_init(void **private_data)
81 {
82 snd_pcm_hw_params_t *hwparams;
83 snd_pcm_sw_params_t *swparams;
84 snd_pcm_uframes_t buffer_size, xfer_align, start_threshold,
85 stop_threshold;
86 unsigned buffer_time = 0;
87 int err;
88 snd_pcm_info_t *info;
89 snd_output_t *log;
90 snd_pcm_uframes_t period_size;
91 struct private_alsa_data *pad = para_malloc(sizeof(struct private_alsa_data));
92 *private_data = pad;
93
94 snd_pcm_info_alloca(&info);
95 if (snd_output_stdio_attach(&log, stderr, 0) < 0)
96 return -E_ALSA_LOG;
97 err = snd_pcm_open(&pad->handle, conf.device_arg,
98 SND_PCM_STREAM_PLAYBACK, 0);
99 if (err < 0)
100 return -E_PCM_OPEN;
101 if ((err = snd_pcm_info(pad->handle, info)) < 0)
102 return -E_SND_PCM_INFO;
103
104 snd_pcm_hw_params_alloca(&hwparams);
105 snd_pcm_sw_params_alloca(&swparams);
106 if (snd_pcm_hw_params_any(pad->handle, hwparams) < 0)
107 return -E_BROKEN_CONF;
108 if (snd_pcm_hw_params_set_access(pad->handle, hwparams,
109 SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
110 return -E_ACCESS_TYPE;
111 if (snd_pcm_hw_params_set_format(pad->handle, hwparams, FORMAT) < 0)
112 return -E_SAMPLE_FORMAT;
113 if (snd_pcm_hw_params_set_channels(pad->handle, hwparams,
114 conf.channels_arg) < 0)
115 return -E_CHANNEL_COUNT;
116 if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
117 (unsigned int*) &conf.sample_rate_arg, 0) < 0)
118 return -E_SET_RATE;
119 err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time, 0);
120 if (err < 0 || !buffer_time)
121 return -E_GET_BUFFER_TIME;
122 PARA_DEBUG_LOG("buffer time: %d\n", buffer_time);
123 if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
124 &buffer_time, 0) < 0)
125 return -E_SET_BUFFER_TIME;
126 if (snd_pcm_hw_params(pad->handle, hwparams) < 0)
127 return -E_HW_PARAMS;
128 snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0);
129 snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
130 PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size, period_size);
131 if (period_size == buffer_size)
132 return -E_BAD_PERIOD;
133 snd_pcm_sw_params_current(pad->handle, swparams);
134 err = snd_pcm_sw_params_get_xfer_align(swparams, &xfer_align);
135 if (err < 0 || !xfer_align)
136 return -E_GET_XFER;
137 snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
138 /* round to closest transfer boundary */
139 start_threshold = (buffer_size / xfer_align) * xfer_align;
140 if (start_threshold < 1)
141 start_threshold = 1;
142 if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
143 start_threshold) < 0)
144 return -E_START_THRESHOLD;
145 stop_threshold = buffer_size;
146 if (snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
147 stop_threshold) < 0)
148 return -E_STOP_THRESHOLD;
149 if (snd_pcm_sw_params_set_xfer_align(pad->handle, swparams,
150 xfer_align) < 0)
151 return -E_SET_XFER;
152 if (snd_pcm_sw_params(pad->handle, swparams) < 0)
153 return -E_SW_PARAMS;
154 pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
155 * conf.channels_arg / 8;
156 return period_size * pad->bytes_per_frame;
157 }
158
159 /**
160 * push out pcm frames
161 * \param data pointer do data to be written
162 * \param nbytes number of bytes (not frames)
163 *
164 * \return Number of bytes written, -E_ALSA_WRITE on errors.
165 */
166 static int alsa_write(u_char *data, size_t nbytes, void *private_data)
167 {
168 struct private_alsa_data *pad = private_data;
169 size_t frames = nbytes / pad->bytes_per_frame;
170 snd_pcm_sframes_t r, result = 0;
171
172 while (frames > 0) {
173 /* write interleaved frames */
174 r = snd_pcm_writei(pad->handle, data, frames);
175 if (r < 0)
176 PARA_ERROR_LOG("write error: %s\n", snd_strerror(r));
177 if (r == -EAGAIN || (r >= 0 && r < frames))
178 snd_pcm_wait(pad->handle, 1);
179 else if (r == -EPIPE)
180 snd_pcm_prepare(pad->handle);
181 else if (r < 0)
182 return -E_ALSA_WRITE;
183 if (r > 0) {
184 result += r;
185 frames -= r;
186 data += r * pad->bytes_per_frame;
187 }
188 }
189 return result * pad->bytes_per_frame;
190 }
191
192 static void alsa_shutdown(void *private_data)
193 {
194 struct private_alsa_data *pad = private_data;
195 snd_pcm_drain(pad->handle);
196 snd_pcm_close(pad->handle);
197 snd_config_update_free_global();
198 free(pad);
199 }
200
201 /**
202 * check if current time is later than start_time
203 * \param diff pointer to write remaining time to
204 *
205 * If start_time was not given, or current time is later than given
206 * start_time, return 0. Otherwise, return 1 and write the time
207 * difference between current time and start_time to diff. diff may be
208 * NULL.
209 *
210 */
211 static int start_time_in_future(struct timeval *diff)
212 {
213 struct timeval now;
214
215 if (!conf.start_time_given)
216 return 0;
217 gettimeofday(&now, NULL);
218 return tv_diff(start_time, &now, diff) > 0? 1 : 0;
219 }
220
221 /**
222 * sleep until time given at command line
223 *
224 * This is called if the initial buffer is filled. It returns
225 * immediately if no start_time was given at the command line
226 * or if the given start time is in the past.
227 *
228 */
229 static void do_initial_delay(struct timeval *delay)
230 {
231 do
232 para_select(1, NULL, NULL, delay);
233 while (start_time_in_future(delay));
234 }
235
236 /**
237 * play raw pcm data
238 * \param loaded number of bytes already loaded
239 *
240 * If start_time was given, prebuffer data until buffer is full or
241 * start_time is reached. In any case, do not start playing before
242 * start_time.
243 *
244 * \return positive on success, negative on errors.
245 */
246 static int play_pcm(size_t loaded)
247 {
248 size_t bufsize, written = 0, prebuf_size;
249 unsigned char *p;
250 struct timeval delay;
251 void *private_data;
252 int chunk_bytes, ret = alsa_init(&private_data);
253
254 if (ret < 0)
255 goto out;
256 chunk_bytes = ret;
257 bufsize = (conf.bufsize_arg * 1024 / chunk_bytes) * chunk_bytes;
258 audiobuf = para_realloc(audiobuf, bufsize);
259 prebuf_size = conf.prebuffer_arg * bufsize / 100;
260 again:
261 if (!written) {
262 if (loaded < prebuf_size)
263 goto read;
264 if (start_time && start_time_in_future(&delay)) {
265 do_initial_delay(&delay);
266 start_time = NULL;
267 }
268 }
269 p = audiobuf;
270 while (loaded >= chunk_bytes) {
271 ret = alsa_write(p, chunk_bytes, private_data);
272 if (ret < 0)
273 goto out;
274 p += ret;
275 written += ret;
276 loaded -= ret;
277 }
278 if (loaded && p != audiobuf)
279 memmove(audiobuf, p, loaded);
280 read:
281 ret = read(STDIN_FILENO, audiobuf + loaded, bufsize - loaded);
282 if (ret < 0) {
283 ret = -E_READ_STDIN;
284 goto out;
285 }
286 if (ret) {
287 loaded += ret;
288 goto again;
289 }
290 ret = 1;
291 out:
292 alsa_shutdown(private_data);
293 return ret;
294 }
295
296 /**
297 * test if audio buffer contains a valid wave header
298 *
299 * \return If not, return 0, otherwise, store number of channels and sample rate
300 * in struct conf and return WAV_HEADER_LEN.
301 */
302 static size_t check_wave(void)
303 {
304 unsigned char *a = audiobuf;
305 if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' || a[3] != 'F')
306 return WAV_HEADER_LEN;
307 conf.channels_arg = (unsigned) a[22];
308 conf.sample_rate_arg = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
309 return 0;
310 }
311
312 int main(int argc, char *argv[])
313 {
314 struct timeval tv;
315 int ret;
316
317 cmdline_parser(argc, argv, &conf);
318 if (conf.start_time_given) {
319 ret = -E_PLAY_SYNTAX;
320 if (sscanf(conf.start_time_arg, "%lu:%lu",
321 &tv.tv_sec, &tv.tv_usec) != 2)
322 goto out;
323 start_time = &tv;
324 }
325 audiobuf = para_malloc(WAV_HEADER_LEN);
326 ret = read_wav_header();
327 if (ret < 0)
328 goto out;
329 ret = play_pcm(check_wave());
330 out:
331 free(audiobuf);
332 if (ret < 0)
333 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
334 return ret;
335 }