diff --git a/include/gapk/procqueue.h b/include/gapk/procqueue.h
index 59f567e..18a644f 100644
--- a/include/gapk/procqueue.h
+++ b/include/gapk/procqueue.h
@@ -40,4 +40,8 @@ struct pq_item *	pq_add_item(struct pq *pq);
 int			pq_prepare(struct pq *pq);
 int			pq_execute(struct pq *pq);
 
+/* File */
+int pq_queue_file_input(struct pq *pq, FILE *src, unsigned int block_len);
+int pq_queue_file_output(struct pq *pq, FILE *dst, unsigned int block_len);
+
 #endif /* __GAPK_PROCQUEUE_H__ */
diff --git a/src/Makefile.am b/src/Makefile.am
index 1a0531f..43d046e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -4,6 +4,6 @@ AM_LDFLAGS=$(LIBOSMOCODEC_LIBS) ${OPENCORE_AMRNB_LIBS} ${LIBGSM_LIBS}
 
 bin_PROGRAMS = gapk
 gapk_SOURCES =	main.c	\
-		procqueue.c \
+		procqueue.c pq_file.c \
 		formats.c fmt_amr.c fmt_gsm.c fmt_hr_ref.c fmt_racal.c \
 		codecs.c codec_pcm.c codec_hr.c codec_fr.c codec_efr.c
diff --git a/src/pq_file.c b/src/pq_file.c
new file mode 100644
index 0000000..4b16555
--- /dev/null
+++ b/src/pq_file.c
@@ -0,0 +1,99 @@
+/* Process Queue: File handling tasks */
+
+/*
+ * This file is part of gapk (GSM Audio Pocket Knife).
+ *
+ * gapk is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * gapk is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with gapk.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <gapk/codecs.h>
+#include <gapk/formats.h>
+#include <gapk/procqueue.h>
+
+
+struct pq_state_file {
+	FILE *fh;
+	unsigned int blk_len;
+};
+
+
+static int
+pq_cb_file_input(void *_state, uint8_t *out, const uint8_t *in)
+{
+	struct pq_state_file *state = _state;
+	int rv;
+	rv = fread(out, state->blk_len, 1, state->fh);
+	return rv == 1 ? 0 : -1;
+}
+
+static int
+pq_cb_file_output(void *_state, uint8_t *out, const uint8_t *in)
+{
+	struct pq_state_file *state = _state;
+	int rv;
+	rv = fwrite(in, state->blk_len, 1, state->fh);
+	return rv == 1 ? 0 : -1;
+}
+
+static void
+pq_cb_file_exit(void *_state)
+{
+	free(_state);
+}
+
+static int
+pq_queue_file_op(struct pq *pq, FILE *fh, unsigned int blk_len, int in_out_n)
+{
+	struct pq_item *item;
+	struct pq_state_file *state;
+
+	state = calloc(1, sizeof(struct pq_state_file));
+	if (!state)
+		return -ENOMEM;
+
+	state->fh = fh;
+	state->blk_len = blk_len;
+
+	item = pq_add_item(pq);
+	if (!item) {
+		free(state);
+		return -ENOMEM;
+	}
+
+	item->len_in  = in_out_n ? 0 : blk_len;
+	item->len_out = in_out_n ? blk_len : 0;
+	item->state   = state;
+	item->proc    = in_out_n ? pq_cb_file_input : pq_cb_file_output;
+	item->exit    = pq_cb_file_exit;
+
+	return 0;
+}
+
+
+int
+pq_queue_file_input(struct pq *pq, FILE *src, unsigned int blk_len)
+{
+	return pq_queue_file_op(pq, src, blk_len, 1);
+}
+
+int
+pq_queue_file_output(struct pq *pq, FILE *dst, unsigned int blk_len)
+{
+	return pq_queue_file_op(pq, dst, blk_len, 0);
+}