1 /* tinyplay.c
2 **
3 ** Copyright 2011, The Android Open Source Project
4 **
5 ** Redistribution and use in source and binary forms, with or without
6 ** modification, are permitted provided that the following conditions are met:
7 **     * Redistributions of source code must retain the above copyright
8 **       notice, this list of conditions and the following disclaimer.
9 **     * Redistributions in binary form must reproduce the above copyright
10 **       notice, this list of conditions and the following disclaimer in the
11 **       documentation and/or other materials provided with the distribution.
12 **     * Neither the name of The Android Open Source Project nor the names of
13 **       its contributors may be used to endorse or promote products derived
14 **       from this software without specific prior written permission.
15 **
16 ** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
17 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 ** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
20 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 ** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
26 ** DAMAGE.
27 */
28 
29 #include <tinyalsa/asoundlib.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <stdint.h>
33 #include <string.h>
34 #include <signal.h>
35 
36 #define ID_RIFF 0x46464952
37 #define ID_WAVE 0x45564157
38 #define ID_FMT  0x20746d66
39 #define ID_DATA 0x61746164
40 
41 struct riff_wave_header {
42     uint32_t riff_id;
43     uint32_t riff_sz;
44     uint32_t wave_id;
45 };
46 
47 struct chunk_header {
48     uint32_t id;
49     uint32_t sz;
50 };
51 
52 struct chunk_fmt {
53     uint16_t audio_format;
54     uint16_t num_channels;
55     uint32_t sample_rate;
56     uint32_t byte_rate;
57     uint16_t block_align;
58     uint16_t bits_per_sample;
59 };
60 
61 static int close = 0;
62 
63 void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned int channels,
64                  unsigned int rate, unsigned int bits, unsigned int period_size,
65                  unsigned int period_count);
66 
stream_close(int sig)67 void stream_close(int sig)
68 {
69     /* allow the stream to be closed gracefully */
70     signal(sig, SIG_IGN);
71     close = 1;
72 }
73 
main(int argc,char ** argv)74 int main(int argc, char **argv)
75 {
76     FILE *file;
77     struct riff_wave_header riff_wave_header;
78     struct chunk_header chunk_header;
79     struct chunk_fmt chunk_fmt;
80     unsigned int device = 0;
81     unsigned int card = 0;
82     unsigned int period_size = 1024;
83     unsigned int period_count = 4;
84     char *filename;
85     int more_chunks = 1;
86 
87     if (argc < 2) {
88         fprintf(stderr, "Usage: %s file.wav [-D card] [-d device] [-p period_size]"
89                 " [-n n_periods] \n", argv[0]);
90         return 1;
91     }
92 
93     filename = argv[1];
94     file = fopen(filename, "rb");
95     if (!file) {
96         fprintf(stderr, "Unable to open file '%s'\n", filename);
97         return 1;
98     }
99 
100     fread(&riff_wave_header, sizeof(riff_wave_header), 1, file);
101     if ((riff_wave_header.riff_id != ID_RIFF) ||
102         (riff_wave_header.wave_id != ID_WAVE)) {
103         fprintf(stderr, "Error: '%s' is not a riff/wave file\n", filename);
104         fclose(file);
105         return 1;
106     }
107 
108     do {
109         fread(&chunk_header, sizeof(chunk_header), 1, file);
110 
111         switch (chunk_header.id) {
112         case ID_FMT:
113             fread(&chunk_fmt, sizeof(chunk_fmt), 1, file);
114             /* If the format header is larger, skip the rest */
115             if (chunk_header.sz > sizeof(chunk_fmt))
116                 fseek(file, chunk_header.sz - sizeof(chunk_fmt), SEEK_CUR);
117             break;
118         case ID_DATA:
119             /* Stop looking for chunks */
120             more_chunks = 0;
121             break;
122         default:
123             /* Unknown chunk, skip bytes */
124             fseek(file, chunk_header.sz, SEEK_CUR);
125         }
126     } while (more_chunks);
127 
128     /* parse command line arguments */
129     argv += 2;
130     while (*argv) {
131         if (strcmp(*argv, "-d") == 0) {
132             argv++;
133             if (*argv)
134                 device = atoi(*argv);
135         }
136         if (strcmp(*argv, "-p") == 0) {
137             argv++;
138             if (*argv)
139                 period_size = atoi(*argv);
140         }
141         if (strcmp(*argv, "-n") == 0) {
142             argv++;
143             if (*argv)
144                 period_count = atoi(*argv);
145         }
146         if (strcmp(*argv, "-D") == 0) {
147             argv++;
148             if (*argv)
149                 card = atoi(*argv);
150         }
151         if (*argv)
152             argv++;
153     }
154 
155     play_sample(file, card, device, chunk_fmt.num_channels, chunk_fmt.sample_rate,
156                 chunk_fmt.bits_per_sample, period_size, period_count);
157 
158     fclose(file);
159 
160     return 0;
161 }
162 
check_param(struct pcm_params * params,unsigned int param,unsigned int value,char * param_name,char * param_unit)163 int check_param(struct pcm_params *params, unsigned int param, unsigned int value,
164                  char *param_name, char *param_unit)
165 {
166     unsigned int min;
167     unsigned int max;
168     int is_within_bounds = 1;
169 
170     min = pcm_params_get_min(params, param);
171     if (value < min) {
172         fprintf(stderr, "%s is %u%s, device only supports >= %u%s\n", param_name, value,
173                 param_unit, min, param_unit);
174         is_within_bounds = 0;
175     }
176 
177     max = pcm_params_get_max(params, param);
178     if (value > max) {
179         fprintf(stderr, "%s is %u%s, device only supports <= %u%s\n", param_name, value,
180                 param_unit, max, param_unit);
181         is_within_bounds = 0;
182     }
183 
184     return is_within_bounds;
185 }
186 
sample_is_playable(unsigned int card,unsigned int device,unsigned int channels,unsigned int rate,unsigned int bits,unsigned int period_size,unsigned int period_count)187 int sample_is_playable(unsigned int card, unsigned int device, unsigned int channels,
188                         unsigned int rate, unsigned int bits, unsigned int period_size,
189                         unsigned int period_count)
190 {
191     struct pcm_params *params;
192     int can_play;
193 
194     params = pcm_params_get(card, device, PCM_OUT);
195     if (params == NULL) {
196         fprintf(stderr, "Unable to open PCM device %u.\n", device);
197         return 0;
198     }
199 
200     can_play = check_param(params, PCM_PARAM_RATE, rate, "Sample rate", "Hz");
201     can_play &= check_param(params, PCM_PARAM_CHANNELS, channels, "Sample", " channels");
202     can_play &= check_param(params, PCM_PARAM_SAMPLE_BITS, bits, "Bitrate", " bits");
203     can_play &= check_param(params, PCM_PARAM_PERIOD_SIZE, period_size, "Period size", "Hz");
204     can_play &= check_param(params, PCM_PARAM_PERIODS, period_count, "Period count", "Hz");
205 
206     pcm_params_free(params);
207 
208     return can_play;
209 }
210 
play_sample(FILE * file,unsigned int card,unsigned int device,unsigned int channels,unsigned int rate,unsigned int bits,unsigned int period_size,unsigned int period_count)211 void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned int channels,
212                  unsigned int rate, unsigned int bits, unsigned int period_size,
213                  unsigned int period_count)
214 {
215     struct pcm_config config;
216     struct pcm *pcm;
217     char *buffer;
218     int size;
219     int num_read;
220 
221     config.channels = channels;
222     config.rate = rate;
223     config.period_size = period_size;
224     config.period_count = period_count;
225     if (bits == 32)
226         config.format = PCM_FORMAT_S32_LE;
227     else if (bits == 16)
228         config.format = PCM_FORMAT_S16_LE;
229     config.start_threshold = 0;
230     config.stop_threshold = 0;
231     config.silence_threshold = 0;
232 
233     if (!sample_is_playable(card, device, channels, rate, bits, period_size, period_count)) {
234         return;
235     }
236 
237     pcm = pcm_open(card, device, PCM_OUT, &config);
238     if (!pcm || !pcm_is_ready(pcm)) {
239         fprintf(stderr, "Unable to open PCM device %u (%s)\n",
240                 device, pcm_get_error(pcm));
241         return;
242     }
243 
244     size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
245     buffer = malloc(size);
246     if (!buffer) {
247         fprintf(stderr, "Unable to allocate %d bytes\n", size);
248         free(buffer);
249         pcm_close(pcm);
250         return;
251     }
252 
253     printf("Playing sample: %u ch, %u hz, %u bit\n", channels, rate, bits);
254 
255     /* catch ctrl-c to shutdown cleanly */
256     signal(SIGINT, stream_close);
257 
258     do {
259         num_read = fread(buffer, 1, size, file);
260         if (num_read > 0) {
261             if (pcm_write(pcm, buffer, num_read)) {
262                 fprintf(stderr, "Error playing sample\n");
263                 break;
264             }
265         }
266     } while (!close && num_read > 0);
267 
268     free(buffer);
269     pcm_close(pcm);
270 }
271 
272