para_play: introduce struct private_alsa_data
[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 }
199
200 /**
201 * check if current time is later than start_time
202 * \param diff pointer to write remaining time to
203 *
204 * If start_time was not given, or current time is later than given
205 * start_time, return 0. Otherwise, return 1 and write the time
206 * difference between current time and start_time to diff. diff may be
207 * NULL.
208 *
209 */
210 static int start_time_in_future(struct timeval *diff)
211 {
212 struct timeval now;
213
214 if (!conf.start_time_given)
215 return 0;
216 gettimeofday(&now, NULL);
217 return tv_diff(start_time, &now, diff) > 0? 1 : 0;
218 }
219
220 /**
221 * sleep until time given at command line
222 *
223 * This is called if the initial buffer is filled. It returns
224 * immediately if no start_time was given at the command line
225 * or if the given start time is in the past.
226 *
227 */
228 static void do_initial_delay(struct timeval *delay)
229 {
230 do
231 para_select(1, NULL, NULL, delay);
232 while (start_time_in_future(delay));
233 }
234
235 /**
236 * play raw pcm data
237 * \param loaded number of bytes already loaded
238 *
239 * If start_time was given, prebuffer data until buffer is full or
240 * start_time is reached. In any case, do not start playing before
241 * start_time.
242 *
243 * \return positive on success, negative on errors.
244 */
245 static int play_pcm(size_t loaded)
246 {
247 size_t bufsize, written = 0, prebuf_size;
248 unsigned char *p;
249 struct timeval delay;
250 void *private_data;
251 int chunk_bytes, ret = alsa_init(&private_data);
252
253 if (ret < 0)
254 goto out;
255 chunk_bytes = ret;
256 bufsize = (conf.bufsize_arg * 1024 / chunk_bytes) * chunk_bytes;
257 audiobuf = para_realloc(audiobuf, bufsize);
258 prebuf_size = conf.prebuffer_arg * bufsize / 100;
259 again:
260 if (!written) {
261 if (loaded < prebuf_size)
262 goto read;
263 if (start_time && start_time_in_future(&delay)) {
264 do_initial_delay(&delay);
265 start_time = NULL;
266 }
267 }
268 p = audiobuf;
269 while (loaded >= chunk_bytes) {
270 ret = alsa_write(p, chunk_bytes, private_data);
271 if (ret < 0)
272 goto out;
273 p += ret;
274 written += ret;
275 loaded -= ret;
276 }
277 if (loaded && p != audiobuf)
278 memmove(audiobuf, p, loaded);
279 read:
280 ret = read(STDIN_FILENO, audiobuf + loaded, bufsize - loaded);
281 if (ret < 0) {
282 ret = -E_READ_STDIN;
283 goto out;
284 }
285 if (ret) {
286 loaded += ret;
287 goto again;
288 }
289 ret = 1;
290 out:
291 alsa_shutdown(private_data);
292 return ret;
293 }
294
295 /**
296 * test if audio buffer contains a valid wave header
297 *
298 * \return If not, return 0, otherwise, store number of channels and sample rate
299 * in struct conf and return WAV_HEADER_LEN.
300 */
301 static size_t check_wave(void)
302 {
303 unsigned char *a = audiobuf;
304 if (a[0] != 'R' || a[1] != 'I' || a[2] != 'F' || a[3] != 'F')
305 return WAV_HEADER_LEN;
306 conf.channels_arg = (unsigned) a[22];
307 conf.sample_rate_arg = a[24] + (a[25] << 8) + (a[26] << 16) + (a[27] << 24);
308 return 0;
309 }
310
311 int main(int argc, char *argv[])
312 {
313 struct timeval tv;
314 int ret;
315
316 cmdline_parser(argc, argv, &conf);
317 if (conf.start_time_given) {
318 ret = -E_PLAY_SYNTAX;
319 if (sscanf(conf.start_time_arg, "%lu:%lu",
320 &tv.tv_sec, &tv.tv_usec) != 2)
321 goto out;
322 start_time = &tv;
323 }
324 audiobuf = para_malloc(WAV_HEADER_LEN);
325 ret = read_wav_header();
326 if (ret < 0)
327 goto out;
328 ret = play_pcm(check_wave());
329 out:
330 free(audiobuf);
331 if (ret < 0)
332 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
333 return ret;
334 }