Code:
/* tinyplay.c
**
** Copyright 2011, The Android Open Source Project
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** * Neither the name of The Android Open Source Project nor the names of
** its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
** DAMAGE.
*/
#include <tinyalsa/asoundlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <signal.h>
#define ID_RIFF 0x46464952
#define ID_WAVE 0x45564157
#define ID_FMT 0x20746d66
#define ID_DATA 0x61746164
struct riff_wave_header {
uint32_t riff_id;
uint32_t riff_sz;
uint32_t wave_id;
};
struct chunk_header {
uint32_t id;
uint32_t sz;
};
struct chunk_fmt {
uint16_t audio_format;
uint16_t num_channels;
uint32_t sample_rate;
uint32_t byte_rate;
uint16_t block_align;
uint16_t bits_per_sample;
};
static int close = 0;
void 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);
void stream_close(int sig)
{
/* allow the stream to be closed gracefully */
signal(sig, SIG_IGN);
close = 1;
}
int main(int argc, char **argv)
{
FILE *file;
struct riff_wave_header riff_wave_header;
struct chunk_header chunk_header;
struct chunk_fmt chunk_fmt;
unsigned int device = 0;
unsigned int card = 0;
unsigned int period_size = 1024;
unsigned int period_count = 4;
unsigned int channels = 2;
unsigned int rate = 48000;
unsigned int bits = 16;
unsigned int is_raw = 0; /* Default wav file */
char *filename;
int more_chunks = 1;
if (argc < 2) {
fprintf(stderr, "Usage1: %s file.wav [-D card] [-d device] [-p period_size]"
" [-n n_periods] \n", argv[0]);
fprintf(stderr, "Usage2: %s file.raw [-D card] [-d device] [-p period_size] "
"[-n n_periods] [-c channels] [-r rate] [-b bits] -i raw \n", argv[0]);
return 1;
}
filename = argv[1];
file = fopen(filename, "rb");
if (!file) {
fprintf(stderr, "Unable to open file '%s'\n", filename);
return 1;
}
/* parse command line arguments */
argv += 2;
while (*argv) {
if (strcmp(*argv, "-d") == 0) {
argv++;
if (*argv)
device = atoi(*argv);
}
if (strcmp(*argv, "-p") == 0) {
argv++;
if (*argv)
period_size = atoi(*argv);
}
if (strcmp(*argv, "-n") == 0) {
argv++;
if (*argv)
period_count = atoi(*argv);
}
if (strcmp(*argv, "-D") == 0) {
argv++;
if (*argv)
card = atoi(*argv);
}
if (strcmp(*argv, "-c") == 0) {
argv++;
if (*argv)
channels = atoi(*argv);
}
if (strcmp(*argv, "-r") == 0) {
argv++;
if (*argv)
rate = atoi(*argv);
}
if (strcmp(*argv, "-b") == 0) {
argv++;
if (*argv)
bits = atoi(*argv);
}
if (strcmp(*argv, "-i") == 0) {
argv++;
if (*argv) {
if (strcasecmp(*argv, "raw") == 0) {
is_raw = 1;
}
}
}
if (*argv)
argv++;
}
if ( !is_raw ) {
fread(&riff_wave_header, sizeof(riff_wave_header), 1, file);
if ((riff_wave_header.riff_id != ID_RIFF) ||
(riff_wave_header.wave_id != ID_WAVE)) {
fprintf(stderr, "Error: '%s' is not a riff/wave file\n", filename);
fclose(file);
return 1;
}
do {
fread(&chunk_header, sizeof(chunk_header), 1, file);
switch (chunk_header.id) {
case ID_FMT:
fread(&chunk_fmt, sizeof(chunk_fmt), 1, file);
/* If the format header is larger, skip the rest */
if (chunk_header.sz > sizeof(chunk_fmt))
fseek(file, chunk_header.sz - sizeof(chunk_fmt), SEEK_CUR);
break;
case ID_DATA:
/* Stop looking for chunks */
more_chunks = 0;
break;
default:
/* Unknown chunk, skip bytes */
fseek(file, chunk_header.sz, SEEK_CUR);
}
} while (more_chunks);
channels = chunk_fmt.num_channels;
rate = chunk_fmt.sample_rate;
bits = chunk_fmt.bits_per_sample;
}
play_sample(file, card, device, channels, rate, bits, period_size, period_count);
fclose(file);
return 0;
}
int check_param(struct pcm_params *params, unsigned int param, unsigned int value,
char *param_name, char *param_unit)
{
unsigned int min;
unsigned int max;
int is_within_bounds = 1;
min = pcm_params_get_min(params, param);
if (value < min) {
fprintf(stderr, "%s is %u%s, device only supports >= %u%s\n", param_name, value,
param_unit, min, param_unit);
is_within_bounds = 0;
}
max = pcm_params_get_max(params, param);
if (value > max) {
fprintf(stderr, "%s is %u%s, device only supports <= %u%s\n", param_name, value,
param_unit, max, param_unit);
is_within_bounds = 0;
}
return is_within_bounds;
}
int 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)
{
struct pcm_params *params;
int can_play;
params = pcm_params_get(card, device, PCM_OUT);
if (params == NULL) {
fprintf(stderr, "Unable to open PCM device %u.\n", device);
return 0;
}
can_play = check_param(params, PCM_PARAM_RATE, rate, "Sample rate", "Hz");
can_play &= check_param(params, PCM_PARAM_CHANNELS, channels, "Sample", " channels");
can_play &= check_param(params, PCM_PARAM_SAMPLE_BITS, bits, "Bitrate", " bits");
can_play &= check_param(params, PCM_PARAM_PERIOD_SIZE, period_size, "Period size", "Hz");
can_play &= check_param(params, PCM_PARAM_PERIODS, period_count, "Period count", "Hz");
pcm_params_free(params);
return can_play;
}
void 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)
{
struct pcm_config config;
struct pcm *pcm;
char *buffer;
int size;
int num_read;
memset(&config, 0, sizeof(config));
config.channels = channels;
config.rate = rate;
config.period_size = period_size;
config.period_count = period_count;
if (bits == 32)
config.format = PCM_FORMAT_S32_LE;
else if (bits == 16)
config.format = PCM_FORMAT_S16_LE;
config.start_threshold = 0;
config.stop_threshold = 0;
config.silence_threshold = 0;
if (!sample_is_playable(card, device, channels, rate, bits, period_size, period_count)) {
return;
}
pcm = pcm_open(card, device, PCM_OUT, &config);
if (!pcm || !pcm_is_ready(pcm)) {
fprintf(stderr, "Unable to open PCM device %u (%s)\n",
device, pcm_get_error(pcm));
return;
}
size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
buffer = malloc(size);
if (!buffer) {
fprintf(stderr, "Unable to allocate %d bytes\n", size);
free(buffer);
pcm_close(pcm);
return;
}
printf("Playing sample: %u ch, %u hz, %u bit\n", channels, rate, bits);
/* catch ctrl-c to shutdown cleanly */
signal(SIGINT, stream_close);
do {
num_read = fread(buffer, 1, size, file);
if (num_read > 0) {
if (pcm_write(pcm, buffer, num_read)) {
fprintf(stderr, "Error playing sample\n");
break;
}
}
} while (!close && num_read > 0);
free(buffer);
pcm_close(pcm);
}
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