audio数据的存储方式 package 和 planar
AV_SAMPLE_FMT_S16P is planar signed 16 bit audio, i.e. 2 bytes for each sample which is same for
The only difference is in
AV_SAMPLE_FMT_S16 samples of each channel are interleaved i.e. if you have two channel audio then the samples buffer will look like
c1 c1 c2 c2 c1 c1 c2 c2…
c1 is a sample for channel1 and
c2 is sample for channel2.
while for one frame of planar audio you will have something like
c1 c1 c1 c1 …. c2 c2 c2 c2 ..
now how is it stored in AVFrame:
for planar audio:
data[i] will contain the data of channel i (assuming channel 0 is first channel).
however if you have more channels then 8 then data for rest of the channels can be found in extended_data attribute of AVFrame.
for non-planar audio
data will contain the data for all channels in an interleaved manner.