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Hi:
i'm doing some develop on
a linux system, kernel version: 2.6.23.9. alsa-lib
version:1.0.15.
now ffmpeg and alsa can work together to
playback mp3/aac file. during this step:
snd_pcm_open(&pcm_handle, "default", SND_PCM_STREAM_PLAYBACK,
0);
set_params(); //set hw and sw params. while(audio_data) { decode_audio_data(&audio_data, &data_len); snd_pcm_writei(audio_data. data_len); } and the mp3 playback is ok, now i'm going to add the
volume control functions when the sound is playback.
but when i read the alsa-lib api funtions reference,
i can not clearly know how i can control the pcm volume by alsa-lib
functions.
and in alsamixer and amixer functions, seems complex
to complete the operation. is it has a simple way to control the pcm
volume? thanks for any suggestions.
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