Read and write raw PCM using GStreamer

Embedded developers have a frequent need to encode or decode PCM audio. In this post I show some GStreamer pipelines that can help with that task.

Convert WAV to PCM

1	gst-launch filesrc location=file.wav ! wavparse ! audioresample ! audioconvert ! audio/x-raw-int, rate=8000, channels=1, endianness=4321, width=16, depth=16, signed=true ! filesink location=file.pcm

For bulk conversion

1	ls *.wav | xargs -i -n 1 gst-launch filesrc location='{}' ! wavparse ! audioresample ! audioconvert ! audio/x-raw-int, rate=8000, channels=1, endianness=4321, width=16, depth=16, signed=true ! filesink location='{}'.pcm

Convert PCM to WAV

1	gst-launch filesrc location=file.pcm ! audio/x-raw-int, rate=8000, channels=1, endianness=4321, width=16, depth=16, signed=true ! audioconvert ! audio/x-raw-int, rate=8000, channels=1, endianness=1234, width=16, depth=16, signed=true ! wavenc ! filesink location=file.wav

Play PCM

1	gst-launch filesrc location=file.pcm ! audio/x-raw-int, rate=8000, channels=1, endianness=4321, width=16, depth=16, signed=true ! pulsesink

Use xxd to create C array of PCM data

1	xxd -i file.pcm > voice.c

转自：https://delog.wordpress.com/2011/10/04/read-and-write-raw-pcm-using-gstreamer/