Hello
I am a newbie in alsa development, so please bear with me :)
I would like to write a simple audio player using the ALSA library.
Currently I have got the three ALSA packages (driver, lib, util)
installed. I can use ALSA to output sound, like when i'm using xmms or
playing quake 2. However what I want to do is not just to use the ALSA
drivers, but to write a simple audio player using its library. I cannot
even compile the demo program supplied by the alsa how-to. I have
included <alsa/asoundlib.h> , but compiler said it could not be found. I
searched through my linux system and found the .h file in
sys/asoundlib.h, so i included that and tried again. Now that asoundlib
could be found but i got
mplay.c: In function `int main(int, char **)':
mplay.c:14: `snd_pcm_hw_params_t' undeclared (first use this function)
mplay.c:14: (Each undeclared identifier is reported only once
mplay.c:14: for each function it appears in.)
mplay.c:14: `hw_params' undeclared (first use this function)
mplay.c:16: `SND_PCM_STREAM_PLAYBACK' undeclared (first use this
function)
mplay.c:16: passing `char *' to argument 2 of `snd_pcm_open(snd_pcm_t
**, int, int, int)' lacks a cast
mplay.c:23: implicit declaration of function `int
snd_pcm_hw_params_malloc(...)'
mplay.c:29: implicit declaration of function `int
snd_pcm_hw_params_any(...)'
mplay.c:35: `SND_PCM_ACCESS_RW_INTERLEAVED' undeclared (first use this
function)
mplay.c:35: implicit declaration of function `int
snd_pcm_hw_params_set_access(...)'
mplay.c:41: `SND_PCM_FORMAT_S16_LE' undeclared (first use this function)
mplay.c:41: implicit declaration of function `int
snd_pcm_hw_params_set_format(...)'
mplay.c:47: implicit declaration of function `int
snd_pcm_hw_params_set_rate_near(...)'
mplay.c:53: implicit declaration of function `int
snd_pcm_hw_params_set_channels(...)'
mplay.c:59: implicit declaration of function `int
snd_pcm_hw_params(...)'
mplay.c:65: implicit declaration of function `int
snd_pcm_hw_params_free(...)'
mplay.c:67: implicit declaration of function `int snd_pcm_prepare(...)'
mplay.c:74: implicit declaration of function `int snd_pcm_writei(...)'
make: *** [mplay] Error 1
Could anyone tell me what's missing? Thank You Very Much
PS: i've put -lasound but still get the same result
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