2 * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
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.
25 #define WAV_HEADER_LEN 44
26 #include <sys/time.h> /* gettimeofday */
29 #include "play.cmdline.h"
30 #include <alsa/asoundlib.h>
34 #define FORMAT SND_PCM_FORMAT_S16_LE
36 struct private_alsa_data
{
38 size_t bytes_per_frame
;
42 struct writer
*writer
;
47 int (*open
)(struct writer_node
**);
48 int (*write
)(char *data
, size_t nbytes
, struct writer_node
*);
49 void (*close
)(struct writer_node
*);
50 void (*shutdown
)(struct writer_node
*);
54 static struct writer writers
[NUM_WRITERS
];
55 #define FOR_EACH_WRITER(i) for (i = 0; i < NUM_WRITERS, i++)
56 static struct writer_node
**writer_nodes
;
59 static unsigned char *audiobuf
;
60 static struct timeval
*start_time
;
61 static struct gengetopt_args_info conf
;
65 void para_log(__a_unused
int ll
, const char* fmt
,...)
70 vfprintf(stderr
, fmt
, argp
);
75 * read WAV_HEADER_LEN bytes from stdin to audio buffer
77 * \return -E_READ_HDR on errors and on eof before WAV_HEADER_LEN could be
78 * read. A positive return value indicates success.
80 static int read_wav_header(void)
82 ssize_t ret
, count
= 0;
84 while (count
< WAV_HEADER_LEN
) {
85 ret
= read(STDIN_FILENO
, audiobuf
+ count
, WAV_HEADER_LEN
- count
);
94 * open and prepare the PCM handle for writing
96 * Install PCM software and hardware configuration. Exit on errors.
98 static int alsa_open(void **private_data
)
100 snd_pcm_hw_params_t
*hwparams
;
101 snd_pcm_sw_params_t
*swparams
;
102 snd_pcm_uframes_t buffer_size
, xfer_align
, start_threshold
,
104 unsigned buffer_time
= 0;
106 snd_pcm_info_t
*info
;
108 snd_pcm_uframes_t period_size
;
109 struct private_alsa_data
*pad
= para_malloc(sizeof(struct private_alsa_data
));
112 snd_pcm_info_alloca(&info
);
113 if (snd_output_stdio_attach(&log
, stderr
, 0) < 0)
115 err
= snd_pcm_open(&pad
->handle
, conf
.device_arg
,
116 SND_PCM_STREAM_PLAYBACK
, 0);
119 if ((err
= snd_pcm_info(pad
->handle
, info
)) < 0)
120 return -E_SND_PCM_INFO
;
122 snd_pcm_hw_params_alloca(&hwparams
);
123 snd_pcm_sw_params_alloca(&swparams
);
124 if (snd_pcm_hw_params_any(pad
->handle
, hwparams
) < 0)
125 return -E_BROKEN_CONF
;
126 if (snd_pcm_hw_params_set_access(pad
->handle
, hwparams
,
127 SND_PCM_ACCESS_RW_INTERLEAVED
) < 0)
128 return -E_ACCESS_TYPE
;
129 if (snd_pcm_hw_params_set_format(pad
->handle
, hwparams
, FORMAT
) < 0)
130 return -E_SAMPLE_FORMAT
;
131 if (snd_pcm_hw_params_set_channels(pad
->handle
, hwparams
,
132 conf
.channels_arg
) < 0)
133 return -E_CHANNEL_COUNT
;
134 if (snd_pcm_hw_params_set_rate_near(pad
->handle
, hwparams
,
135 (unsigned int*) &conf
.sample_rate_arg
, 0) < 0)
137 err
= snd_pcm_hw_params_get_buffer_time_max(hwparams
, &buffer_time
, 0);
138 if (err
< 0 || !buffer_time
)
139 return -E_GET_BUFFER_TIME
;
140 PARA_DEBUG_LOG("buffer time: %d\n", buffer_time
);
141 if (snd_pcm_hw_params_set_buffer_time_near(pad
->handle
, hwparams
,
142 &buffer_time
, 0) < 0)
143 return -E_SET_BUFFER_TIME
;
144 if (snd_pcm_hw_params(pad
->handle
, hwparams
) < 0)
146 snd_pcm_hw_params_get_period_size(hwparams
, &period_size
, 0);
147 snd_pcm_hw_params_get_buffer_size(hwparams
, &buffer_size
);
148 PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size
, period_size
);
149 if (period_size
== buffer_size
)
150 return -E_BAD_PERIOD
;
151 snd_pcm_sw_params_current(pad
->handle
, swparams
);
152 err
= snd_pcm_sw_params_get_xfer_align(swparams
, &xfer_align
);
153 if (err
< 0 || !xfer_align
)
155 snd_pcm_sw_params_set_avail_min(pad
->handle
, swparams
, period_size
);
156 /* round to closest transfer boundary */
157 start_threshold
= (buffer_size
/ xfer_align
) * xfer_align
;
158 if (start_threshold
< 1)
160 if (snd_pcm_sw_params_set_start_threshold(pad
->handle
, swparams
,
161 start_threshold
) < 0)
162 return -E_START_THRESHOLD
;
163 stop_threshold
= buffer_size
;
164 if (snd_pcm_sw_params_set_stop_threshold(pad
->handle
, swparams
,
166 return -E_STOP_THRESHOLD
;
167 if (snd_pcm_sw_params_set_xfer_align(pad
->handle
, swparams
,
170 if (snd_pcm_sw_params(pad
->handle
, swparams
) < 0)
172 pad
->bytes_per_frame
= snd_pcm_format_physical_width(FORMAT
)
173 * conf
.channels_arg
/ 8;
174 return period_size
* pad
->bytes_per_frame
;
178 * push out pcm frames
179 * \param data pointer do data to be written
180 * \param nbytes number of bytes (not frames)
182 * \return Number of bytes written, -E_ALSA_WRITE on errors.
184 static int alsa_write(char *data
, size_t nbytes
, void *private_data
)
186 struct private_alsa_data
*pad
= private_data
;
187 size_t frames
= nbytes
/ pad
->bytes_per_frame
;
188 unsigned char *d
= data
;
189 snd_pcm_sframes_t r
, result
= 0;
192 /* write interleaved frames */
193 r
= snd_pcm_writei(pad
->handle
, d
, frames
);
195 PARA_ERROR_LOG("write error: %s\n", snd_strerror(r
));
196 if (r
== -EAGAIN
|| (r
>= 0 && r
< frames
))
197 snd_pcm_wait(pad
->handle
, 1);
198 else if (r
== -EPIPE
)
199 snd_pcm_prepare(pad
->handle
);
201 return -E_ALSA_WRITE
;
205 d
+= r
* pad
->bytes_per_frame
;
208 return result
* pad
->bytes_per_frame
;
211 static void alsa_close(void *private_data
)
213 struct private_alsa_data
*pad
= private_data
;
214 snd_pcm_drain(pad
->handle
);
215 snd_pcm_close(pad
->handle
);
216 snd_config_update_free_global();
220 void alsa_writer_init(struct writer
*w
)
223 w
->write
= alsa_write
;
224 w
->close
= alsa_close
;
225 w
->shutdown
= NULL
; /* nothing to do */
230 * check if current time is later than start_time
231 * \param diff pointer to write remaining time to
233 * If start_time was not given, or current time is later than given
234 * start_time, return 0. Otherwise, return 1 and write the time
235 * difference between current time and start_time to diff. diff may be
239 static int start_time_in_future(struct timeval
*diff
)
243 if (!conf
.start_time_given
)
245 gettimeofday(&now
, NULL
);
246 return tv_diff(start_time
, &now
, diff
) > 0? 1 : 0;
250 * sleep until time given at command line
252 * This is called if the initial buffer is filled. It returns
253 * immediately if no start_time was given at the command line
254 * or if the given start time is in the past.
257 static void do_initial_delay(struct timeval
*delay
)
260 para_select(1, NULL
, NULL
, delay
);
261 while (start_time_in_future(delay
));
266 * \param loaded number of bytes already loaded
268 * If start_time was given, prebuffer data until buffer is full or
269 * start_time is reached. In any case, do not start playing before
272 * \return positive on success, negative on errors.
274 static int play_pcm(size_t loaded
)
276 size_t bufsize
, written
= 0, prebuf_size
;
278 struct timeval delay
;
280 int chunk_bytes
, ret
= alsa_open(&private_data
);
285 bufsize
= (conf
.bufsize_arg
* 1024 / chunk_bytes
) * chunk_bytes
;
286 audiobuf
= para_realloc(audiobuf
, bufsize
);
287 prebuf_size
= conf
.prebuffer_arg
* bufsize
/ 100;
290 if (loaded
< prebuf_size
)
292 if (start_time
&& start_time_in_future(&delay
)) {
293 do_initial_delay(&delay
);
298 while (loaded
>= chunk_bytes
) {
299 ret
= alsa_write(p
, chunk_bytes
, private_data
);
306 if (loaded
&& p
!= audiobuf
)
307 memmove(audiobuf
, p
, loaded
);
309 ret
= read(STDIN_FILENO
, audiobuf
+ loaded
, bufsize
- loaded
);
320 alsa_close(private_data
);
325 * test if audio buffer contains a valid wave header
327 * \return If not, return 0, otherwise, store number of channels and sample rate
328 * in struct conf and return WAV_HEADER_LEN.
330 static size_t check_wave(void)
332 unsigned char *a
= audiobuf
;
333 if (a
[0] != 'R' || a
[1] != 'I' || a
[2] != 'F' || a
[3] != 'F')
334 return WAV_HEADER_LEN
;
335 conf
.channels_arg
= (unsigned) a
[22];
336 conf
.sample_rate_arg
= a
[24] + (a
[25] << 8) + (a
[26] << 16) + (a
[27] << 24);
340 int main(int argc
, char *argv
[])
345 cmdline_parser(argc
, argv
, &conf
);
346 if (conf
.start_time_given
) {
347 ret
= -E_PLAY_SYNTAX
;
348 if (sscanf(conf
.start_time_arg
, "%lu:%lu",
349 &tv
.tv_sec
, &tv
.tv_usec
) != 2)
353 /* call init for each supported writer */
354 alsa_writer_init(&writers
[0]);
355 /* one for each given writer */
356 writer_nodes
= para_calloc(2 * sizeof(struct writer_node
));
358 audiobuf
= para_malloc(WAV_HEADER_LEN
);
359 ret
= read_wav_header();
362 ret
= play_pcm(check_wave());
366 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));