linux-kernel - [PATCH 05/31] media: vidtv: fix the tone generator logic

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Date:   Tue, 24 Nov 2020 12:06:01 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "Daniel W. S. Almeida" <dwlsalmeida@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: [PATCH 05/31] media: vidtv: fix the tone generator logic

The tone generator logic were repeating the song after the
first silent. There's also a wrong logic at the note
offset calculus, which may create some noise.

Fix it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---
 drivers/media/test-drivers/vidtv/vidtv_s302m.c | 14 ++++----------
 drivers/media/test-drivers/vidtv/vidtv_s302m.h |  2 +-
 2 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/media/test-drivers/vidtv/vidtv_s302m.c b/drivers/media/test-drivers/vidtv/vidtv_s302m.c
index cbf89530aafe..fdb3d649c516 100644
--- a/drivers/media/test-drivers/vidtv/vidtv_s302m.c
+++ b/drivers/media/test-drivers/vidtv/vidtv_s302m.c
@@ -253,18 +253,12 @@ static u16 vidtv_s302m_get_sample(struct vidtv_encoder *e)
 			ctx->last_duration--;
 		}
 
-		/* Handle silent */
-		if (!ctx->last_tone) {
-			e->src_buf_offset = 0;
+		/* Handle pause notes */
+		if (!ctx->last_tone)
 			return 0x8000;
-		}
 
-		pos = (2 * PI * ctx->note_offset * ctx->last_tone / S302M_SAMPLING_RATE_HZ);
-
-		if (pos == 360)
-			ctx->note_offset = 0;
-		else
-			ctx->note_offset++;
+		pos = (2 * PI * ctx->note_offset * ctx->last_tone) / S302M_SAMPLING_RATE_HZ;
+		ctx->note_offset++;
 
 		return (fixp_sin32(pos % (2 * PI)) >> 16) + 0x8000;
 	}
diff --git a/drivers/media/test-drivers/vidtv/vidtv_s302m.h b/drivers/media/test-drivers/vidtv/vidtv_s302m.h
index a0101734e758..e990b755bb20 100644
--- a/drivers/media/test-drivers/vidtv/vidtv_s302m.h
+++ b/drivers/media/test-drivers/vidtv/vidtv_s302m.h
@@ -39,7 +39,7 @@ struct vidtv_s302m_ctx {
 	u32 frame_index;
 	u32 au_count;
 	int last_duration;
-	int note_offset;
+	unsigned int note_offset;
 	enum musical_notes last_tone;
 };
 
-- 
2.28.0