[FFmpeg-devel] [PATCH] avformat/cdg: add probe

[Paul B Mahol <onemda@gmail.com>]

[-- Attachment #1: Type: text/plain, Size: 16 bytes --]

Patch attached.

[-- Attachment #2: 0001-avformat-cdg-add-probe.patch --]
[-- Type: text/x-patch, Size: 1358 bytes --]

From b0cd65c70465da729d950dfff1c20129e81462fc Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Tue, 14 Feb 2023 22:25:42 +0100
Subject: [PATCH] avformat/cdg: add probe

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 libavformat/cdg.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/libavformat/cdg.c b/libavformat/cdg.c
index 36f25e7f66..f598285911 100644
--- a/libavformat/cdg.c
+++ b/libavformat/cdg.c
@@ -26,6 +26,22 @@
 #define CDG_COMMAND        0x09
 #define CDG_MASK           0x3F
 
+static int read_probe(const AVProbeData *p)
+{
+    const int cnt = p->buf_size / CDG_PACKET_SIZE;
+    int score = 0;
+
+    for (int i = 0; i < cnt; i++) {
+        const int x = p->buf[i * CDG_PACKET_SIZE] & CDG_MASK;
+
+        score += x == CDG_COMMAND;
+        if (x != CDG_COMMAND && x != 0)
+            return 0;
+    }
+
+    return FFMIN(score, AVPROBE_SCORE_MAX);
+}
+
 static int read_header(AVFormatContext *s)
 {
     AVStream *vst;
@@ -70,6 +86,7 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
 const AVInputFormat ff_cdg_demuxer = {
     .name           = "cdg",
     .long_name      = NULL_IF_CONFIG_SMALL("CD Graphics"),
+    .read_probe     = read_probe,
     .read_header    = read_header,
     .read_packet    = read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
-- 
2.39.1


[-- Attachment #3: Type: text/plain, Size: 251 bytes --]

_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel

To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".