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>
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 */
56 #define FORMAT SND_PCM_FORMAT_S16_LE
60 fprintf (stderr, "error: " #EXP "\n"); exit(EXP);} \
63 static snd_pcm_t
*handle
;
64 static snd_pcm_uframes_t chunk_size
;
65 static unsigned char *audiobuf
;
66 static size_t bytes_per_frame
;
67 static struct timeval
*start_time
;
68 static struct gengetopt_args_info conf
;
70 void para_log(__a_unused
int ll
, const char* fmt
,...)
75 vfprintf(stderr
, fmt
, argp
);
80 * read_wav_header - read WAV_HEADER_LEN bytes from stdin to audio buffer
82 * Exit on errors and on eof before WAV_HEADER_LEN could be read.
84 static void read_wav_header(void)
86 ssize_t ret
, count
= 0;
88 while (count
< WAV_HEADER_LEN
) {
89 ret
= read(STDIN_FILENO
, audiobuf
+ count
, WAV_HEADER_LEN
- count
);
97 * open and prepare the PCM handle for writing
99 * Install PCM software and hardware configuration. Exit on errors.
101 static void alsa_init(void)
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
,
107 unsigned buffer_time
= 0;
109 snd_pcm_info_t
*info
;
112 snd_pcm_info_alloca(&info
);
113 if (snd_output_stdio_attach(&log
, stderr
, 0) < 0)
115 err
= snd_pcm_open(&handle
, conf
.device_arg
,
116 SND_PCM_STREAM_PLAYBACK
, 0);
119 if ((err
= snd_pcm_info(handle
, info
)) < 0)
120 EXIT(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(handle
, hwparams
) < 0)
126 if (snd_pcm_hw_params_set_access(handle
, hwparams
,
127 SND_PCM_ACCESS_RW_INTERLEAVED
) < 0)
129 if (snd_pcm_hw_params_set_format(handle
, hwparams
, FORMAT
) < 0)
130 EXIT(E_SAMPLE_FORMAT
);
131 if (snd_pcm_hw_params_set_channels(handle
, hwparams
, conf
.channels_arg
) < 0)
132 EXIT(E_CHANNEL_COUNT
);
133 if (snd_pcm_hw_params_set_rate_near(handle
, hwparams
,
134 (unsigned int*) &conf
.sample_rate_arg
, 0) < 0)
136 err
= snd_pcm_hw_params_get_buffer_time_max(hwparams
, &buffer_time
, 0);
137 if (err
< 0 || !buffer_time
)
138 EXIT(E_GET_BUFFER_TIME
);
139 PARA_DEBUG_LOG("buffer time: %d\n", buffer_time
);
140 if (snd_pcm_hw_params_set_buffer_time_near(handle
, hwparams
,
141 &buffer_time
, 0) < 0)
142 EXIT(E_SET_BUFFER_TIME
);
143 if (snd_pcm_hw_params(handle
, hwparams
) < 0)
145 snd_pcm_hw_params_get_period_size(hwparams
, &chunk_size
, 0);
146 snd_pcm_hw_params_get_buffer_size(hwparams
, &buffer_size
);
147 PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size
, chunk_size
);
148 if (chunk_size
== buffer_size
)
150 snd_pcm_sw_params_current(handle
, swparams
);
151 err
= snd_pcm_sw_params_get_xfer_align(swparams
, &xfer_align
);
152 if (err
< 0 || !xfer_align
)
154 // snd_pcm_sw_params_set_sleep_min(handle, swparams, 0);
155 snd_pcm_sw_params_set_avail_min(handle
, swparams
, chunk_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(handle
, swparams
,
161 start_threshold
) < 0)
162 EXIT(E_START_THRESHOLD
);
163 stop_threshold
= buffer_size
;
164 if (snd_pcm_sw_params_set_stop_threshold(handle
, swparams
,
166 EXIT(E_STOP_THRESHOLD
);
167 if (snd_pcm_sw_params_set_xfer_align(handle
, swparams
, xfer_align
) < 0)
169 if (snd_pcm_sw_params(handle
, swparams
) < 0)
171 bytes_per_frame
= snd_pcm_format_physical_width(FORMAT
) * conf
.channels_arg
/ 8;
175 * push out pcm frames
176 * \param data pointer do data to be written
177 * \param nbytes number of bytes (not frames)
179 * \return Number of bytes written. Exit on errors.
181 int alsa_write(u_char
*data
, size_t nbytes
)
183 size_t count
= nbytes
/ bytes_per_frame
;
184 snd_pcm_sframes_t r
, result
= 0;
186 /* write interleaved frames */
187 r
= snd_pcm_writei(handle
, data
, count
);
189 PARA_ERROR_LOG("write error: %s\n", snd_strerror(r
));
190 if (r
== -EAGAIN
|| (r
>= 0 && r
< count
))
191 snd_pcm_wait(handle
, 1);
192 else if (r
== -EPIPE
)
193 snd_pcm_prepare(handle
);
199 data
+= r
* bytes_per_frame
;
202 return result
* bytes_per_frame
;
205 void alsa_shutdown(void)
207 snd_pcm_drain(handle
);
208 snd_pcm_close(handle
);
209 snd_config_update_free_global();
213 * start_time_in_future - check if current time is later than start_time
214 * \param diff pointer to write remaining time to
216 * If start_time was not given, or current time is later than given
217 * start_time, return 0. Otherwise, return 1 and write the time
218 * difference between current time and start_time to diff. diff may be
222 static int start_time_in_future(struct timeval
*diff
)
226 if (!conf
.start_time_given
)
228 gettimeofday(&now
, NULL
);
229 return tv_diff(start_time
, &now
, diff
) > 0? 1 : 0;
233 * do_initial_delay - sleep until time given at command line
235 * This is called if the initial buffer is filled. It returns
236 * immediately if no start_time was given at the command line
237 * or if the given start time is in the past.
240 static void do_initial_delay(struct timeval
*delay
)
243 para_select(1, NULL
, NULL
, delay
);
244 while (start_time_in_future(delay
));
248 * play_pcm - play raw pcm data
249 * \param loaded number of bytes already loaded
251 * If start_time was given, prebuffer data until buffer is full or
252 * start_time is reached. In any case, do not start playing before
255 static void play_pcm(size_t loaded
)
257 size_t chunk_bytes
, bufsize
, written
= 0, prebuf_size
;
260 struct timeval delay
;
263 chunk_bytes
= chunk_size
* bytes_per_frame
;
264 bufsize
= (conf
.bufsize_arg
* 1024 / chunk_bytes
) * chunk_bytes
;
265 audiobuf
= realloc(audiobuf
, bufsize
);
268 prebuf_size
= conf
.prebuffer_arg
* bufsize
/ 100;
271 if (loaded
< prebuf_size
)
273 if (start_time
&& start_time_in_future(&delay
)) {
274 do_initial_delay(&delay
);
279 while (loaded
>= chunk_bytes
) {
280 ret
= alsa_write(p
, chunk_bytes
);
285 if (loaded
&& p
!= audiobuf
)
286 memmove(audiobuf
, p
, loaded
);
288 ret
= read(STDIN_FILENO
, audiobuf
+ loaded
, bufsize
- loaded
);
299 * check_wave - test if audio buffer contains a valid wave header
301 * If not, return 0, otherwise, store number of channels and sample rate
302 * in struct conf and return WAV_HEADER_LEN.
304 static size_t check_wave(void)
306 unsigned char *a
= audiobuf
;
307 if (a
[0] != 'R' || a
[1] != 'I' || a
[2] != 'F' || a
[3] != 'F')
308 return WAV_HEADER_LEN
;
309 conf
.channels_arg
= (unsigned) a
[22];
310 conf
.sample_rate_arg
= a
[24] + (a
[25] << 8) + (a
[26] << 16) + (a
[27] << 24);
314 int main(int argc
, char *argv
[])
318 cmdline_parser(argc
, argv
, &conf
);
319 if (conf
.start_time_given
) {
320 if (sscanf(conf
.start_time_arg
, "%lu:%lu",
321 &tv
.tv_sec
, &tv
.tv_usec
) != 2)
325 audiobuf
= malloc(WAV_HEADER_LEN
);
327 play_pcm(check_wave());