From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.ffmpeg.org (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTPS id 1E5FD4DA13 for ; Tue, 3 Jun 2025 16:01:54 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.ffmpeg.org (Postfix) with ESMTP id 61D1768D7CF; Tue, 3 Jun 2025 19:01:52 +0300 (EEST) Received: from mail-yw1-f171.google.com (mail-yw1-f171.google.com [209.85.128.171]) by ffbox0-bg.ffmpeg.org (Postfix) with ESMTPS id 76BA268D699 for ; Tue, 3 Jun 2025 19:01:45 +0300 (EEST) Received: by mail-yw1-f171.google.com with SMTP id 00721157ae682-70e5e6ab7b8so53017227b3.1 for ; Tue, 03 Jun 2025 09:01:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1748966503; x=1749571303; darn=ffmpeg.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=L0MVG9eqxZ8jtj8Z5xHJx7rzFzYa/bQVl7qvIcCUaB4=; b=QwfXDI4GEYZk399A5HSTAhUHmHeSf1Tifa+afhjS+ugt826uO64WGQ0zv0Ftcj/FSy Ei/Mjag323mN0BscYSQk5M7drzGpDbZ+5QVGq7EP64sartZfKoMuGh2JYqyjPUE2gql6 rMp/JKr6EJuKrVl39cakExh48pdH7/183uHKYWQDBqlqvHfVThIAkE7fOpKOzud76CMb fL/MhcXLKcXOAnlna6TCHyZIspU4//5/8OaKUzICraUJxe98BxnKO54j2ljcHoh13+EM zkecqmY0G4nlJuRWb9v0N3o2ciUPoGVjuec+bAerxILCswVH+Bu/TqSoLko6XwHiRx1T WKvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748966503; x=1749571303; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=L0MVG9eqxZ8jtj8Z5xHJx7rzFzYa/bQVl7qvIcCUaB4=; b=DhL+jhPOjMSrMXP2h8lGlSDjziZObH+4ySoogfNRG73emeQrWo3Fah5XhuLBeY2RHw H2CMyKhn0P4NHvUy/lwEre01Ly7BPtww78kzhz+Ziw/pcmVf2P7KpqUxGVHVQ3SFsb6k vGeeWwD9hFQzAFZ+oaWBEyqinnEOdsQRaKCvqt2xP0AV5BWGDD8UO1Mhqrc/wXkA44OJ eEmCGNn6UWIaUSeZSu7VcE054kRwVZWBUjhb5frEDN7bEx8h8CfbJIsGScXYewMrL1Kw CibybIOmO6XJAn6+cmF8uSW5VBlTKGBHahla79LLOD6NFr20fOksGS5IRRHJDyubNj6V 6n8A== X-Gm-Message-State: AOJu0YxqBb/q8sNEzRBYjBk+2J9T1EssAFiy9ghVuAQS1TunJiwYzilU qd7PEq0ukt6a8XslF48YVq4fQgcrfeJVBTUwRdGpXg+5T7oa0e/fNqv0A8DM8g== X-Gm-Gg: ASbGncuh0ulJxxZt7Qj0UHnX67g6FDNODhUzSr3Ql1WjG6NM5cbzZVtz/dDXwa1jGTv j6whdoHSKvAx68eXFD1n2WA7dcNowydjngWxVGuoASibtQvDmcgbZpPe4LevHd/5dqS6hyxS+4W xryELgLX13wv47qRhMYPRDq1jVO59NghooDCMiocxwub6HNlDGz8+FIMmL7jO4S+q61ApLT+twA K4ArRLf67X2z+kurtnr6njlZb9Fh5FeefMK7yOrxBJ0i6w0/vOc0qRUQc3v9EdK3e+d9yXRcQfg ZKHgFSvLCy5XRvyLOrsY8smxgAYKAX8KvUN9YWJRxQZiW2ZwLdp4uytSO3Q+JHhGAtSdGQQ= X-Google-Smtp-Source: AGHT+IHqCpWTNRVsdY1GDdp3Qv4Jq+8dQ41MVuXCePKvqDOcbkx4Ma1lIYJXfDiFUh8rRWyaKM0p0A== X-Received: by 2002:a05:690c:b9b:b0:70e:53a1:a814 with SMTP id 00721157ae682-70f97f2a5f3mr240566357b3.29.1748966502749; Tue, 03 Jun 2025 09:01:42 -0700 (PDT) Received: from localhost.localdomain ([2600:1700:9f70:5cdf:989f:2b50:4ab:e82d]) by smtp.gmail.com with ESMTPSA id 00721157ae682-70f8ad23292sm25903497b3.119.2025.06.03.09.01.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Jun 2025 09:01:41 -0700 (PDT) From: Rashad Tatum To: ffmpeg-devel@ffmpeg.org Date: Tue, 3 Jun 2025 12:00:54 -0400 Message-ID: <20250603160102.3213636-1-tatum.rashad@gmail.com> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v1] Add new method for playing network based streams with a play rate. X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 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 Cc: Rashad Tatum Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Add implementation for changing the play rate for rtsp streams. --- libavformat/avformat.h | 6 ++++++ libavformat/demux.h | 6 ++++++ libavformat/demux_utils.c | 6 ++++++ libavformat/rtsp.c | 1 + libavformat/rtsp.h | 10 ++++++++++ libavformat/rtspdec.c | 21 +++++++++++++++++++-- 6 files changed, 48 insertions(+), 2 deletions(-) diff --git a/libavformat/avformat.h b/libavformat/avformat.h index 2034d2aecc..13bbca2ae1 100644 --- a/libavformat/avformat.h +++ b/libavformat/avformat.h @@ -2358,6 +2358,12 @@ int avformat_flush(AVFormatContext *s); */ int av_read_play(AVFormatContext *s); +/** + * Play a network-based stream (e.g. RTSP stream) with a given play rate + * (e.g. Scale value for RTSP) and timestamp position. + */ +int av_read_play_with_rate(struct AVFormatContext *s, double play_rate, int stream_index, int64_t timestamp); + /** * Pause a network-based stream (e.g. RTSP stream). * diff --git a/libavformat/demux.h b/libavformat/demux.h index e83d84a201..965743bdf0 100644 --- a/libavformat/demux.h +++ b/libavformat/demux.h @@ -113,6 +113,12 @@ typedef struct FFInputFormat { * (RTSP). */ int (*read_play)(struct AVFormatContext *); + + /** + * Play a network-based stream (e.g. RTSP stream) with a given play rate + * (e.g. Scale value for RTSP) and timestamp position. + */ + int (*read_play_with_rate)(struct AVFormatContext *s, double play_rate, int stream_index, int64_t timestamp); /** * Pause playing - only meaningful if using a network-based format diff --git a/libavformat/demux_utils.c b/libavformat/demux_utils.c index b632277460..8fed41e3b6 100644 --- a/libavformat/demux_utils.c +++ b/libavformat/demux_utils.c @@ -179,6 +179,12 @@ int av_read_play(AVFormatContext *s) return AVERROR(ENOSYS); } +int av_read_play_with_rate(AVFormatContext *s, double play_rate, int stream_index, int64_t timestamp) { + if (ffifmt(s->iformat)->read_play_with_rate) + return ffifmt(s->iformat)->read_play_with_rate(s, play_rate, stream_index, timestamp); + return AVERROR(ENOSYS); +} + int av_read_pause(AVFormatContext *s) { if (ffifmt(s->iformat)->read_pause) diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c index 5ea471b40c..6cfbcdf989 100644 --- a/libavformat/rtsp.c +++ b/libavformat/rtsp.c @@ -1998,6 +1998,7 @@ redirect: av_strlcpy(rt->real_challenge, real_challenge, sizeof(rt->real_challenge)); rt->state = RTSP_STATE_IDLE; rt->seek_timestamp = 0; /* default is to start stream at position zero */ + rt->scale = 1.0; /* default is to play at the normal rate */ return 0; fail: ff_rtsp_close_streams(s); diff --git a/libavformat/rtsp.h b/libavformat/rtsp.h index 83b2e3f4fb..1b8ce05d74 100644 --- a/libavformat/rtsp.h +++ b/libavformat/rtsp.h @@ -245,6 +245,16 @@ typedef struct RTSPState { * whenever we resume playback. Either way, the value is only used once, * see rtsp_read_play() and rtsp_read_seek(). */ int64_t seek_timestamp; + + /** the scale value requested when calling av_read_play(). This value + * is subsequently used as part of the "Scale" parameter when emitting + * the RTSP PLAY command. The "Scale" parameter determines the stream play + * rate. A value of 1 represents the normal play rate. Any other value is + * in regards to the normal play rate. A negative value represents reverse + * playback. If we are currently playing, this command is called instantly. + * If we are currently paused, this command is called whenever we resume + * playback. */ + double scale; int seq; /**< RTSP command sequence number */ diff --git a/libavformat/rtspdec.c b/libavformat/rtspdec.c index 10078ce2fa..6ba0f8c7d7 100644 --- a/libavformat/rtspdec.c +++ b/libavformat/rtspdec.c @@ -39,6 +39,7 @@ #include "tls.h" #include "url.h" #include "version.h" +#include static const struct RTSPStatusMessage { enum RTSPStatusCode code; @@ -527,7 +528,7 @@ static int rtsp_read_play(AVFormatContext *s) { RTSPState *rt = s->priv_data; RTSPMessageHeader reply1, *reply = &reply1; - int i; + int i, cmd_char_count = 0; char cmd[MAX_URL_SIZE]; av_log(s, AV_LOG_DEBUG, "hello state=%d\n", rt->state); @@ -564,11 +565,17 @@ static int rtsp_read_play(AVFormatContext *s) if (rt->state == RTSP_STATE_PAUSED) { cmd[0] = 0; } else { - snprintf(cmd, sizeof(cmd), + + cmd_char_count += snprintf(cmd, sizeof(cmd), "Range: npt=%"PRId64".%03"PRId64"-\r\n", rt->seek_timestamp / AV_TIME_BASE, rt->seek_timestamp / (AV_TIME_BASE / 1000) % 1000); + + snprintf(cmd + cmd_char_count, sizeof(cmd) - cmd_char_count, "Scale: %f\r\n", rt->scale); + } + + ff_rtsp_send_cmd(s, "PLAY", rt->control_uri, cmd, reply, NULL); if (reply->status_code != RTSP_STATUS_OK) { return ff_rtsp_averror(reply->status_code, -1); @@ -593,6 +600,15 @@ static int rtsp_read_play(AVFormatContext *s) return 0; } +static int rtsp_read_play_with_rate(AVFormatContext *s, int stream_index, double play_rate, int64_t timestamp) { + RTSPState *rt = s->priv_data; + rt->seek_timestamp = av_rescale_q(timestamp, + s->streams[stream_index]->time_base, + AV_TIME_BASE_Q); + rt->scale = play_rate; + return rtsp_read_play(s); +} + /* pause the stream */ static int rtsp_read_pause(AVFormatContext *s) { @@ -1006,5 +1022,6 @@ const FFInputFormat ff_rtsp_demuxer = { .read_close = rtsp_read_close, .read_seek = rtsp_read_seek, .read_play = rtsp_read_play, + .read_play_with_rate = rtsp_read_play_with_rate, .read_pause = rtsp_read_pause, }; -- 2.49.0 _______________________________________________ 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".