From efc5ae3755deac971babf8aa7d3b80fd009c8f7b Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Thu, 31 Dec 2009 04:36:23 +0100
Subject: [PATCH 1/1] Add btr support for the wav filter.

---
 error.h      |  2 ++
 wav_filter.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 69 insertions(+), 3 deletions(-)

diff --git a/error.h b/error.h
index 92039f64..9d0283d1 100644
--- a/error.h
+++ b/error.h
@@ -83,6 +83,8 @@ extern const char **para_errlist[];
 
 #define WAV_FILTER_ERRORS \
 	PARA_ERROR(WAV_BAD_FC, "invalid filter chain configuration"), \
+	PARA_ERROR(WAV_EOF, "wav filter: end of file"), \
+	PARA_ERROR(WAV_SUCCESS, "successfully wrote wav header"), \
 
 
 #define FEC_ERRORS \
diff --git a/wav_filter.c b/wav_filter.c
index eada2434..7a3c59bf 100644
--- a/wav_filter.c
+++ b/wav_filter.c
@@ -27,10 +27,9 @@
 #define BITS 16
 
 static void make_wav_header(unsigned int channels, unsigned int samplerate,
-		struct filter_node *fn)
+		char *headbuf)
 {
 
-	char *headbuf = fn->buf;
 	unsigned int size = 0x7fffffff;
 	int bytespersec = channels * samplerate * BITS / 8;
 	int align = channels * BITS / 8;
@@ -64,7 +63,7 @@ static ssize_t wav_convert(char *inbuf, size_t len, struct filter_node *fn)
 			PARA_ERROR_LOG("%s\n", para_strerror(E_WAV_BAD_FC));
 			return -E_WAV_BAD_FC;
 		}
-		make_wav_header(fn->fc->channels, fn->fc->samplerate, fn);
+		make_wav_header(fn->fc->channels, fn->fc->samplerate, fn->buf);
 		fn->loaded = WAV_HEADER_LEN;
 		*bof = 0;
 //		return 0;
@@ -98,6 +97,69 @@ static void wav_open(struct filter_node *fn)
 		fn, fn->buf, fn->loaded);
 }
 
+static void wav_pre_select(struct sched *s, struct task *t)
+{
+	struct filter_node *fn = container_of(t, struct filter_node, task);
+	size_t iqs = btr_get_input_queue_size(fn->btrn);
+
+	t->error = 0;
+	if (iqs == 0)
+		return;
+	s->timeout.tv_sec = 0;
+	s->timeout.tv_usec = 1;
+}
+
+static void wav_post_select(__a_unused struct sched *s, struct task *t)
+{
+	struct filter_node *fn = container_of(t, struct filter_node, task);
+	struct btr_node *btrn = fn->btrn;
+	size_t iqs = btr_get_input_queue_size(btrn);
+	int ret;
+	char *header, *buf;
+	int32_t rate, ch;
+
+
+	t->error = 0;
+	if (iqs == 0) {
+		ret = -E_WAV_EOF;
+		if (btr_no_parent(btrn))
+			goto err;
+		return;
+	}
+	ret = btr_exec_up(btrn, "samplerate", &buf);
+	if (ret < 0) {
+		ret = -E_WAV_BAD_FC;
+		goto err;
+	}
+	ret = para_atoi32(buf, &rate);
+	free(buf);
+	if (ret < 0)
+		goto err;
+	ret = btr_exec_up(btrn, "channels", &buf);
+	if (ret < 0) {
+		ret = -E_WAV_BAD_FC;
+		goto err;
+	}
+	ret = para_atoi32(buf, &ch);
+	free(buf);
+	if (ret < 0)
+		goto err;
+	header = para_malloc(WAV_HEADER_LEN);
+	make_wav_header(ch, rate, header);
+	btr_add_output(header, WAV_HEADER_LEN, btrn);
+	btr_pushdown(btrn);
+	ret = -E_WAV_SUCCESS;
+err:
+	t->error = ret;
+	wav_close(fn);
+	if (ret == -E_WAV_SUCCESS)
+		ret = btr_splice_out_node(btrn);
+	else {
+		btr_del_node(btrn);
+		PARA_ERROR_LOG("%s\n", para_strerror(-ret));
+	}
+}
+
 /**
  * the init function of the wav filter
  *
@@ -108,4 +170,6 @@ void wav_filter_init(struct filter *f)
 	f->convert = wav_convert;
 	f->close = wav_close;
 	f->open = wav_open;
+	f->pre_select = wav_pre_select;
+	f->post_select = wav_post_select;
 }
-- 
2.39.2