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([2601:647:4d7f:7033:2e50:1857:6d3b:b1fe]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-772396d2dbcsm3858872b3a.50.2025.08.30.16.27.26 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 30 Aug 2025 16:27:26 -0700 (PDT) Message-ID: <4ac2a014-38fc-4ba4-8ea4-73ea281c3d1b@gmail.com> Date: Sat, 30 Aug 2025 16:27:25 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: ffmpeg-devel@ffmpeg.org Content-Language: en-US Message-ID-Hash: PPMPQUBGUNLVAWG76DWRWU5WP5JPUYFU X-Message-ID-Hash: PPMPQUBGUNLVAWG76DWRWU5WP5JPUYFU X-MailFrom: SRS0=KNt4=3K=gmail.com=impiaaa@ffmpeg.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-ffmpeg-devel.ffmpeg.org-0; header-match-ffmpeg-devel.ffmpeg.org-1; header-match-ffmpeg-devel.ffmpeg.org-2; header-match-ffmpeg-devel.ffmpeg.org-3; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] [PATCH] avformat/wavdec: support loop_start and loop_end from 'smpl' chunk List-Id: FFmpeg development discussions and patches Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Spencer Alves via ffmpeg-devel Cc: Spencer Alves Content-Type: text/plain; charset="us-ascii"; format="flowed" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: The 'smpl' chunk is used for sampling music synthesizers, and includes things like the pitch of the sample and how to loop it. This exposes the loop points as "loop_start" and "loop_end" metadata, that the brstm, mca, and scd demuxers already support. Tested with file output from "Polyphone" soundfont editor. Signed-off-by: Spencer Alves --- libavformat/wavdec.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c index c65e0a2723..fb3749d64d 100644 --- a/libavformat/wavdec.c +++ b/libavformat/wavdec.c @@ -595,6 +595,28 @@ static int wav_read_header(AVFormatContext *s) } } break; + case MKTAG('s', 'm', 'p', 'l'): + if (size >= 36 && got_fmt && st->codecpar->sample_rate > 0) { + unsigned sample_loop_count; + avio_skip(pb, 28); + sample_loop_count = avio_rl32(pb); + avio_skip(pb, 4); + for (unsigned i = 0; i < sample_loop_count; i++) { + avio_skip(pb, 8); + if (av_dict_set_int(&s->metadata, "loop_start", + av_rescale(avio_rl32(pb), AV_TIME_BASE, + st->codecpar->sample_rate), + AV_DICT_MULTIKEY) < 0) + return AVERROR(ENOMEM); + avio_skip(pb, 8); + if (av_dict_set_int(&s->metadata, "loop_end", + av_rescale(avio_rl32(pb), AV_TIME_BASE, + st->codecpar->sample_rate), + AV_DICT_MULTIKEY) < 0) + return AVERROR(ENOMEM); + } + } + break; } /* seek to next tag unless we know that we'll run into EOF */ -- 2.48.1 _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org