From 05492521d51352fa8c4f55b71b33e14656f0bd0d Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Sun, 3 Jan 2010 00:22:56 +0100
Subject: [PATCH 1/1] btr support for the wmadec filter.

---
 error.h         |   1 +
 wmadec_filter.c | 130 +++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 118 insertions(+), 13 deletions(-)

diff --git a/error.h b/error.h
index 0a491690..fd0213b2 100644
--- a/error.h
+++ b/error.h
@@ -61,6 +61,7 @@ extern const char **para_errlist[];
 	PARA_ERROR(WMA_BAD_SUPERFRAME, "invalid superframe"), \
 	PARA_ERROR(WMA_BLOCK_SIZE, "invalid block size"), \
 	PARA_ERROR(INCOHERENT_BLOCK_LEN, "incoherent block length"), \
+	PARA_ERROR(WMADEC_EOF, "wmadec: end of file"), \
 
 
 #define IMDCT_ERRORS \
diff --git a/wmadec_filter.c b/wmadec_filter.c
index 9cc94f4c..4bbc2413 100644
--- a/wmadec_filter.c
+++ b/wmadec_filter.c
@@ -1192,6 +1192,120 @@ fail:
 	return ret;
 }
 
+static void wmadec_close(struct filter_node *fn)
+{
+	struct private_wmadec_data *pwd = fn->private_data;
+
+	if (!pwd)
+		return;
+	wmadec_cleanup(pwd);
+	free(fn->buf);
+	fn->buf = NULL;
+	free(fn->private_data);
+	fn->private_data = NULL;
+}
+
+static int wmadec_execute(struct btr_node *btrn, const char *cmd, char **result)
+{
+	struct filter_node *fn = btr_context(btrn);
+	struct private_wmadec_data *pwd = fn->private_data;
+
+	if (!strcmp(cmd, "samplerate")) {
+		if (pwd->ahi.sample_rate == 0)
+			return -ERRNO_TO_PARA_ERROR(ENAVAIL);
+		*result = make_message("%u", pwd->ahi.sample_rate);
+		return 1;
+	}
+	if (!strcmp(cmd, "channels")) {
+		if (pwd->ahi.channels == 0)
+			return -ERRNO_TO_PARA_ERROR(ENAVAIL);
+		*result = make_message("%u", pwd->ahi.channels);
+		return 1;
+	}
+	return -ERRNO_TO_PARA_ERROR(ENOTSUP);
+}
+
+#define WMADEC_MAX_PENDING (640 * 1024)
+
+static void wmadec_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;
+	if (btr_bytes_pending(fn->btrn) > WMADEC_MAX_PENDING)
+		return; /* FIXME, should use reasonable bound on timeout */
+	s->timeout.tv_sec = 0;
+	s->timeout.tv_usec = 1;
+}
+
+#define WMA_OUTPUT_BUFFER_SIZE (128 * 1024)
+
+static void wmadec_post_select(__a_unused struct sched *s, struct task *t)
+{
+	struct filter_node *fn = container_of(t, struct filter_node, task);
+	int ret, converted = 0;
+	struct private_wmadec_data *pwd = fn->private_data;
+	struct btr_node *btrn = fn->btrn;
+	size_t iqs, len, min_len;
+	char *in;
+
+	min_len = pwd? WMA_FRAME_SKIP + pwd->ahi.block_align : 8192;
+next_buffer:
+	t->error = 0;
+	if (btr_bytes_pending(btrn) > WMADEC_MAX_PENDING)
+		return;
+	iqs = btr_get_input_queue_size(btrn);
+	if (iqs < min_len) {
+		if (!btr_no_parent(btrn)) /* wait for more data */
+			return;
+		ret = -E_WMADEC_EOF;
+		goto err;
+	}
+	/* avoid "buffer too small" errors from the decoder */
+	btr_merge_to(btrn, min_len);
+	len = btr_next_buffer(btrn, &in);
+	assert(len >= min_len);
+	if (!pwd) {
+		ret = wma_decode_init(in, len, &pwd);
+		if (ret < 0)
+			goto err;
+		if (ret == 0) {
+			min_len += 4096;
+			goto next_buffer;
+		}
+		fn->private_data = pwd;
+		converted = pwd->ahi.header_len;
+		goto success;
+	}
+	for (;;) {
+		char *out;
+		int out_size = WMA_OUTPUT_BUFFER_SIZE;
+		if (converted + WMA_FRAME_SKIP + pwd->ahi.block_align > len)
+			break;
+		out = para_malloc(WMA_OUTPUT_BUFFER_SIZE);
+		ret = wma_decode_superframe(pwd, out,
+			&out_size, (uint8_t *)in + converted + WMA_FRAME_SKIP,
+			len - WMA_FRAME_SKIP);
+		if (ret < 0) {
+			free(out);
+			goto err;
+		}
+		btr_add_output(out, out_size, btrn);
+		converted += ret + WMA_FRAME_SKIP;
+	}
+success:
+	btr_consume(btrn, converted);
+	goto next_buffer;
+err:
+	assert(ret < 0);
+	wmadec_close(fn);
+	t->error = ret;
+	btr_del_node(btrn);
+}
+
 static ssize_t wmadec_convert(char *inbuffer, size_t len,
 		struct filter_node *fn)
 {
@@ -1227,19 +1341,6 @@ static ssize_t wmadec_convert(char *inbuffer, size_t len,
 	return converted;
 }
 
-static void wmadec_close(struct filter_node *fn)
-{
-	struct private_wmadec_data *pwd = fn->private_data;
-
-	if (!pwd)
-		return;
-	wmadec_cleanup(pwd);
-	free(fn->buf);
-	fn->buf = NULL;
-	free(fn->private_data);
-	fn->private_data = NULL;
-}
-
 static void wmadec_open(struct filter_node *fn)
 {
 	fn->bufsize = 1024 * 1024;
@@ -1258,4 +1359,7 @@ void wmadec_filter_init(struct filter *f)
 	f->open = wmadec_open;
 	f->close = wmadec_close;
 	f->convert = wmadec_convert;
+	f->execute = wmadec_execute;
+	f->pre_select = wmadec_pre_select;
+	f->post_select = wmadec_post_select;
 }
-- 
2.39.2