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
;
41 static unsigned char *audiobuf
;
42 static struct timeval
*start_time
;
43 static struct gengetopt_args_info conf
;
47 void para_log(__a_unused
int ll
, const char* fmt
,...)
52 vfprintf(stderr
, fmt
, argp
);
57 * read WAV_HEADER_LEN bytes from stdin to audio buffer
59 * \return -E_READ_HDR on errors and on eof before WAV_HEADER_LEN could be
60 * read. A positive return value indicates success.
62 static int read_wav_header(void)
64 ssize_t ret
, count
= 0;
66 while (count
< WAV_HEADER_LEN
) {
67 ret
= read(STDIN_FILENO
, audiobuf
+ count
, WAV_HEADER_LEN
- count
);
76 * open and prepare the PCM handle for writing
78 * Install PCM software and hardware configuration. Exit on errors.
80 static int alsa_init(void **private_data
)
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
,
86 unsigned buffer_time
= 0;
90 snd_pcm_uframes_t period_size
;
91 struct private_alsa_data
*pad
= para_malloc(sizeof(struct private_alsa_data
));
94 snd_pcm_info_alloca(&info
);
95 if (snd_output_stdio_attach(&log
, stderr
, 0) < 0)
97 err
= snd_pcm_open(&pad
->handle
, conf
.device_arg
,
98 SND_PCM_STREAM_PLAYBACK
, 0);
101 if ((err
= snd_pcm_info(pad
->handle
, info
)) < 0)
102 return -E_SND_PCM_INFO
;
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)
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)
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
)
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)
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
,
148 return -E_STOP_THRESHOLD
;
149 if (snd_pcm_sw_params_set_xfer_align(pad
->handle
, swparams
,
152 if (snd_pcm_sw_params(pad
->handle
, swparams
) < 0)
154 pad
->bytes_per_frame
= snd_pcm_format_physical_width(FORMAT
)
155 * conf
.channels_arg
/ 8;
156 return period_size
* pad
->bytes_per_frame
;
160 * push out pcm frames
161 * \param data pointer do data to be written
162 * \param nbytes number of bytes (not frames)
164 * \return Number of bytes written, -E_ALSA_WRITE on errors.
166 static int alsa_write(u_char
*data
, size_t nbytes
, void *private_data
)
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;
173 /* write interleaved frames */
174 r
= snd_pcm_writei(pad
->handle
, data
, frames
);
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
);
182 return -E_ALSA_WRITE
;
186 data
+= r
* pad
->bytes_per_frame
;
189 return result
* pad
->bytes_per_frame
;
192 static void alsa_shutdown(void *private_data
)
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();
201 * check if current time is later than start_time
202 * \param diff pointer to write remaining time to
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
210 static int start_time_in_future(struct timeval
*diff
)
214 if (!conf
.start_time_given
)
216 gettimeofday(&now
, NULL
);
217 return tv_diff(start_time
, &now
, diff
) > 0? 1 : 0;
221 * sleep until time given at command line
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.
228 static void do_initial_delay(struct timeval
*delay
)
231 para_select(1, NULL
, NULL
, delay
);
232 while (start_time_in_future(delay
));
237 * \param loaded number of bytes already loaded
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
243 * \return positive on success, negative on errors.
245 static int play_pcm(size_t loaded
)
247 size_t bufsize
, written
= 0, prebuf_size
;
249 struct timeval delay
;
251 int chunk_bytes
, ret
= alsa_init(&private_data
);
256 bufsize
= (conf
.bufsize_arg
* 1024 / chunk_bytes
) * chunk_bytes
;
257 audiobuf
= para_realloc(audiobuf
, bufsize
);
258 prebuf_size
= conf
.prebuffer_arg
* bufsize
/ 100;
261 if (loaded
< prebuf_size
)
263 if (start_time
&& start_time_in_future(&delay
)) {
264 do_initial_delay(&delay
);
269 while (loaded
>= chunk_bytes
) {
270 ret
= alsa_write(p
, chunk_bytes
, private_data
);
277 if (loaded
&& p
!= audiobuf
)
278 memmove(audiobuf
, p
, loaded
);
280 ret
= read(STDIN_FILENO
, audiobuf
+ loaded
, bufsize
- loaded
);
291 alsa_shutdown(private_data
);
296 * test if audio buffer contains a valid wave header
298 * \return If not, return 0, otherwise, store number of channels and sample rate
299 * in struct conf and return WAV_HEADER_LEN.
301 static size_t check_wave(void)
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);
311 int main(int argc
, char *argv
[])
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)
324 audiobuf
= para_malloc(WAV_HEADER_LEN
);
325 ret
= read_wav_header();
328 ret
= play_pcm(check_wave());
332 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));