Hello,
I am reading an raw PCM file and want to write on PCM device using direct write (interleaved). I have gone through PCM.c test application. I am trying tio write PCM audio data as follows. I am unable to use snd_pcm_mmap_begin and snd_pcm_mmap_commit properly. Please help me to use using these APIs Question : 1) How can i write to Ring buffer area (any pcm audio data)? //Any example or explanation other than pcm.c 2) Do i need to write diffferently for each channel as shown in pcm.c
I am trying to do following but not succeded (reading pcm file and writing content on device) . ANy thing played on audio device would help me in understanding.
snd_pcm_channel_area_t my_areas; snd_pcm_uframes_t offset, frames, size; snd_pcm_sframes_t avail, commitres; int result; char *buffer;
while(1) { avail = snd_pcm_avail_update(handle); if(avail>=period_size) { size=periodsize while (size > 0) { frames = size; err = snd_pcm_mmap_begin(handle, &my_areas, &offset, &frames); mybuffer=(char *)malloc(frames*2); result = fread (mybuffer,1,(frames*2),pFile); my_areas.addr=mybuffer; // IS THIS CORRECT ? WILL THIS WORK ? How can i write my audio file data here in areas? commitres = snd_pcm_mmap_commit(handle, offset, frames); } }
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