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 static snd_pcm_t
*handle
;
37 static snd_pcm_uframes_t chunk_size
;
38 static unsigned char *audiobuf
;
39 static size_t bytes_per_frame
;
40 static struct timeval
*start_time
;
41 static struct gengetopt_args_info conf
;
45 void para_log(__a_unused
int ll
, const char* fmt
,...)
50 vfprintf(stderr
, fmt
, argp
);
55 * read WAV_HEADER_LEN bytes from stdin to audio buffer
57 * \return -E_READ_HDR on errors and on eof before WAV_HEADER_LEN could be
58 * read. A positive return value indicates success.
60 static int read_wav_header(void)
62 ssize_t ret
, count
= 0;
64 while (count
< WAV_HEADER_LEN
) {
65 ret
= read(STDIN_FILENO
, audiobuf
+ count
, WAV_HEADER_LEN
- count
);
74 * open and prepare the PCM handle for writing
76 * Install PCM software and hardware configuration. Exit on errors.
78 static int alsa_init(void)
80 snd_pcm_hw_params_t
*hwparams
;
81 snd_pcm_sw_params_t
*swparams
;
82 snd_pcm_uframes_t buffer_size
, xfer_align
, start_threshold
,
84 unsigned buffer_time
= 0;
89 snd_pcm_info_alloca(&info
);
90 if (snd_output_stdio_attach(&log
, stderr
, 0) < 0)
92 err
= snd_pcm_open(&handle
, conf
.device_arg
,
93 SND_PCM_STREAM_PLAYBACK
, 0);
96 if ((err
= snd_pcm_info(handle
, info
)) < 0)
97 return -E_SND_PCM_INFO
;
99 snd_pcm_hw_params_alloca(&hwparams
);
100 snd_pcm_sw_params_alloca(&swparams
);
101 if (snd_pcm_hw_params_any(handle
, hwparams
) < 0)
102 return -E_BROKEN_CONF
;
103 if (snd_pcm_hw_params_set_access(handle
, hwparams
,
104 SND_PCM_ACCESS_RW_INTERLEAVED
) < 0)
105 return -E_ACCESS_TYPE
;
106 if (snd_pcm_hw_params_set_format(handle
, hwparams
, FORMAT
) < 0)
107 return -E_SAMPLE_FORMAT
;
108 if (snd_pcm_hw_params_set_channels(handle
, hwparams
, conf
.channels_arg
) < 0)
109 return -E_CHANNEL_COUNT
;
110 if (snd_pcm_hw_params_set_rate_near(handle
, hwparams
,
111 (unsigned int*) &conf
.sample_rate_arg
, 0) < 0)
113 err
= snd_pcm_hw_params_get_buffer_time_max(hwparams
, &buffer_time
, 0);
114 if (err
< 0 || !buffer_time
)
115 return -E_GET_BUFFER_TIME
;
116 PARA_DEBUG_LOG("buffer time: %d\n", buffer_time
);
117 if (snd_pcm_hw_params_set_buffer_time_near(handle
, hwparams
,
118 &buffer_time
, 0) < 0)
119 return -E_SET_BUFFER_TIME
;
120 if (snd_pcm_hw_params(handle
, hwparams
) < 0)
122 snd_pcm_hw_params_get_period_size(hwparams
, &chunk_size
, 0);
123 snd_pcm_hw_params_get_buffer_size(hwparams
, &buffer_size
);
124 PARA_DEBUG_LOG("buffer size: %lu, period_size: %lu\n", buffer_size
, chunk_size
);
125 if (chunk_size
== buffer_size
)
126 return -E_BAD_PERIOD
;
127 snd_pcm_sw_params_current(handle
, swparams
);
128 err
= snd_pcm_sw_params_get_xfer_align(swparams
, &xfer_align
);
129 if (err
< 0 || !xfer_align
)
131 // snd_pcm_sw_params_set_sleep_min(handle, swparams, 0);
132 snd_pcm_sw_params_set_avail_min(handle
, swparams
, chunk_size
);
133 /* round to closest transfer boundary */
134 start_threshold
= (buffer_size
/ xfer_align
) * xfer_align
;
135 if (start_threshold
< 1)
137 if (snd_pcm_sw_params_set_start_threshold(handle
, swparams
,
138 start_threshold
) < 0)
139 return -E_START_THRESHOLD
;
140 stop_threshold
= buffer_size
;
141 if (snd_pcm_sw_params_set_stop_threshold(handle
, swparams
,
143 return -E_STOP_THRESHOLD
;
144 if (snd_pcm_sw_params_set_xfer_align(handle
, swparams
, xfer_align
) < 0)
146 if (snd_pcm_sw_params(handle
, swparams
) < 0)
148 bytes_per_frame
= snd_pcm_format_physical_width(FORMAT
) * conf
.channels_arg
/ 8;
149 return chunk_size
* bytes_per_frame
;
153 * push out pcm frames
154 * \param data pointer do data to be written
155 * \param nbytes number of bytes (not frames)
157 * \return Number of bytes written, -E_ALSA_WRITE on errors.
159 static int alsa_write(u_char
*data
, size_t nbytes
)
161 size_t frames
= nbytes
/ bytes_per_frame
;
162 snd_pcm_sframes_t r
, result
= 0;
164 /* write interleaved frames */
165 r
= snd_pcm_writei(handle
, data
, frames
);
167 PARA_ERROR_LOG("write error: %s\n", snd_strerror(r
));
168 if (r
== -EAGAIN
|| (r
>= 0 && r
< frames
))
169 snd_pcm_wait(handle
, 1);
170 else if (r
== -EPIPE
)
171 snd_pcm_prepare(handle
);
173 return -E_ALSA_WRITE
;
177 data
+= r
* bytes_per_frame
;
180 return result
* bytes_per_frame
;
183 static void alsa_shutdown(void)
185 snd_pcm_drain(handle
);
186 snd_pcm_close(handle
);
187 snd_config_update_free_global();
191 * check if current time is later than start_time
192 * \param diff pointer to write remaining time to
194 * If start_time was not given, or current time is later than given
195 * start_time, return 0. Otherwise, return 1 and write the time
196 * difference between current time and start_time to diff. diff may be
200 static int start_time_in_future(struct timeval
*diff
)
204 if (!conf
.start_time_given
)
206 gettimeofday(&now
, NULL
);
207 return tv_diff(start_time
, &now
, diff
) > 0? 1 : 0;
211 * sleep until time given at command line
213 * This is called if the initial buffer is filled. It returns
214 * immediately if no start_time was given at the command line
215 * or if the given start time is in the past.
218 static void do_initial_delay(struct timeval
*delay
)
221 para_select(1, NULL
, NULL
, delay
);
222 while (start_time_in_future(delay
));
227 * \param loaded number of bytes already loaded
229 * If start_time was given, prebuffer data until buffer is full or
230 * start_time is reached. In any case, do not start playing before
233 * \return positive on success, negative on errors.
235 static int play_pcm(size_t loaded
)
237 size_t bufsize
, written
= 0, prebuf_size
;
239 struct timeval delay
;
240 int chunk_bytes
, ret
= alsa_init();
245 bufsize
= (conf
.bufsize_arg
* 1024 / chunk_bytes
) * chunk_bytes
;
246 audiobuf
= para_realloc(audiobuf
, bufsize
);
247 prebuf_size
= conf
.prebuffer_arg
* bufsize
/ 100;
250 if (loaded
< prebuf_size
)
252 if (start_time
&& start_time_in_future(&delay
)) {
253 do_initial_delay(&delay
);
258 while (loaded
>= chunk_bytes
) {
259 ret
= alsa_write(p
, chunk_bytes
);
266 if (loaded
&& p
!= audiobuf
)
267 memmove(audiobuf
, p
, loaded
);
269 ret
= read(STDIN_FILENO
, audiobuf
+ loaded
, bufsize
- loaded
);
285 * test if audio buffer contains a valid wave header
287 * \return If not, return 0, otherwise, store number of channels and sample rate
288 * in struct conf and return WAV_HEADER_LEN.
290 static size_t check_wave(void)
292 unsigned char *a
= audiobuf
;
293 if (a
[0] != 'R' || a
[1] != 'I' || a
[2] != 'F' || a
[3] != 'F')
294 return WAV_HEADER_LEN
;
295 conf
.channels_arg
= (unsigned) a
[22];
296 conf
.sample_rate_arg
= a
[24] + (a
[25] << 8) + (a
[26] << 16) + (a
[27] << 24);
300 int main(int argc
, char *argv
[])
305 cmdline_parser(argc
, argv
, &conf
);
306 if (conf
.start_time_given
) {
307 ret
= -E_PLAY_SYNTAX
;
308 if (sscanf(conf
.start_time_arg
, "%lu:%lu",
309 &tv
.tv_sec
, &tv
.tv_usec
) != 2)
313 audiobuf
= para_malloc(WAV_HEADER_LEN
);
314 ret
= read_wav_header();
317 ret
= play_pcm(check_wave());
321 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));