From patchwork Tue Jan 28 21:27:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul B Mahol X-Patchwork-Id: 17605 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id DD28F447F70 for ; Tue, 28 Jan 2020 23:28:22 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id B3AE768B3CC; Tue, 28 Jan 2020 23:28:22 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail-wm1-f67.google.com (mail-wm1-f67.google.com [209.85.128.67]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id D19C868B255 for ; Tue, 28 Jan 2020 23:28:16 +0200 (EET) Received: by mail-wm1-f67.google.com with SMTP id t23so4116238wmi.1 for ; Tue, 28 Jan 2020 13:28:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id; bh=vtTpW7SagYyCXdxHvErGgT8UX/hbv26fdKcnVLGZmWs=; b=rGiJhCv9TgxkNMhnZbmLTVGraiCBEbkd9Ks50LdxoQxDHEPBbPu1312eBUwgaYViHU slFe1nf1QiVho7+jPnlX1gFHGTB+nS1lsZs0MXGxvgp8aapLgMkD8nMxEe2J6QBjI6as GM+ZZhTIR9HDe+OqvYqMN+7buokRpOEzUvwT+qujkZsk08ZdLUfAI0NhyQvWSSKtl0dE KR32b/IbqxI8NSlz5FqcXlRt6Xxur8AdDLdEiYXx2KxfvezA09TZ78XlJtjQ1U8F/Q2K FIwZADcY9uOMxNWU/qhxXF3dUx6qMcOX3VyuGC/xagwbundYCNk9Qo9y+6nhDCIdLTAZ c2ug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id; bh=vtTpW7SagYyCXdxHvErGgT8UX/hbv26fdKcnVLGZmWs=; b=IcbNXQqNuuEMgb5LKfi41wxBONd6nV/X8hkOMLQsO2q6q6k0DFFzbctjK0u3nfMINN i44ZTeUYo1Rl+JsPnGFpwx+8qjrK1eEkI0rnml6hNAmx7tdYkpNqMgXprU3PEsjyZLkK 2cu71avHxWwQkgPZDriy8f4A5IXnC0tD1oG0kmCwJYBpCMtF1kae3+VXmTPl22evW3lr wzc1ishUK9kAG3RS8ywPQrVK+2JNqv+SnG5DN/aC9yZDfLlcvtFO9mzVaZ7FbIiXPnBx CikWw1SPXqF0DWlUK0Vb5jS3GwWWdPKPDyNoy1ap0o1ZmrCJLwGIITw40Q0FSqKspzdu 5UnQ== X-Gm-Message-State: APjAAAXqI1VPDVClnaVJNOCPI8WnaUeK970CDOVRCiP4Vow50mKOojwM GuXTijYnZVTwFX+syztdc1JZdUoQTcM= X-Google-Smtp-Source: APXvYqxxMJcaCNoqpLNG1tArwFNUqwacI5952KWYt8BZJlog3A6cVYov/4pekXcrC2SsfTGAQisNrQ== X-Received: by 2002:a1c:5ac2:: with SMTP id o185mr7021163wmb.179.1580246895958; Tue, 28 Jan 2020 13:28:15 -0800 (PST) Received: from localhost.localdomain ([109.227.58.1]) by smtp.gmail.com with ESMTPSA id v14sm27089892wrm.28.2020.01.28.13.28.14 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Jan 2020 13:28:15 -0800 (PST) From: Paul B Mahol To: ffmpeg-devel@ffmpeg.org Date: Tue, 28 Jan 2020 22:27:41 +0100 Message-Id: <20200128212741.4890-1-onemda@gmail.com> X-Mailer: git-send-email 2.17.1 Subject: [FFmpeg-devel] [PATCH] avformat/tty: add probe function X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Signed-off-by: Paul B Mahol --- libavformat/tty.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/libavformat/tty.c b/libavformat/tty.c index 8d48f2c45c..69aad64790 100644 --- a/libavformat/tty.c +++ b/libavformat/tty.c @@ -34,6 +34,13 @@ #include "internal.h" #include "sauce.h" +static int isansicode(int x) +{ + return (x == 0x1B) || (x >= 0x20 && x < 0x7f); +} + +static const char tty_extensions[31] = "ans,art,asc,diz,ice,nfo,txt,vt"; + typedef struct TtyDemuxContext { AVClass *class; int chars_per_frame; @@ -42,6 +49,17 @@ typedef struct TtyDemuxContext { AVRational framerate; /**< Set by a private option. */ } TtyDemuxContext; +static int read_probe(const AVProbeData *p) +{ + int cnt = 0; + + for (int i = 0; i < p->buf_size; i++) + cnt += !!isansicode(p->buf[i]); + + return (cnt * 100LL / p->buf_size) * (cnt > 400) * + !!av_match_ext(p->filename, tty_extensions); +} + /** * Parse EFI header */ @@ -153,8 +171,9 @@ AVInputFormat ff_tty_demuxer = { .name = "tty", .long_name = NULL_IF_CONFIG_SMALL("Tele-typewriter"), .priv_data_size = sizeof(TtyDemuxContext), + .read_probe = read_probe, .read_header = read_header, .read_packet = read_packet, - .extensions = "ans,art,asc,diz,ice,nfo,txt,vt", + .extensions = tty_extensions, .priv_class = &tty_demuxer_class, };