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[190.225.105.197]) by smtp.gmail.com with ESMTPSA id d2-20020a63ed02000000b005dbf22d6e1asm3527044pgi.56.2024.02.03.05.24.01 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 03 Feb 2024 05:24:02 -0800 (PST) Message-ID: <666763e4-561f-498c-85b0-e5b3c183436f@gmail.com> Date: Sat, 3 Feb 2024 10:24:33 -0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Content-Language: en-US To: ffmpeg-devel@ffmpeg.org References: <20240129232755.9622-1-cus@passwd.hu> <20240129232755.9622-4-cus@passwd.hu> <3677f954-85ec-4098-a6da-5f3c5dd40873@gmail.com> <170695672373.8914.9293325106328127368@lain.khirnov.net> From: James Almer Autocrypt: addr=jamrial@gmail.com; keydata= xsBNBFjZtqABCADLW+vdEoZaJZDsIO6geYFTOcn1unsEHefj9zn+3oTHlDFFzO47mzHsSfbK 9JE2xpOJEVnC8FAF5Sayi/pVwV+mtQUV3n5dgVeVBYF9GUQwOGFCpK8X54RRqhkgknbunOEE 0CtgAJgmpFmmmHgq02GvEspx1h/rh4apqwQR6QX4Favb+x9+i9ytVpwVcBX94vo2toyP7h/K BWfadQmb8ltgE1kshfg+SQs/H5bTV5Z1DuEASf02ZL/1qYB/sdTgWPLv9XMUHHsRFmMY8TMx wJSkP+Af3AiYQPJYz1B1D4tt98T/NoiVdin10zATakPjV8hXaobuRmxgakkUASXudydDABEB AAHNH0phbWVzIEFsbWVyIDxqYW1yaWFsQGdtYWlsLmNvbT7CwJIEEwEIADwCGwMGCwkIBwMC BhUIAgkKCwQWAgMBAh4BAheAFiEEd1EujP2UoWlX5pp6FGMBrXN2WeAFAmJoLUUCGQEACgkQ FGMBrXN2WeAFVQf9GtGhniRs1PzNUOgJktCnv6j4BbLieaIPYPEFXKDHOgjqQE2zVMYXnoXl Jam928ii902a8OY06r9ywn/R8ApD1/3NY/v64O71CY9scz5XyH2au8wIZ6HwFy3/f7sqjdGD uctY8Qs7rjT7NkoC5lmgMu2v2k03dGtM9AAf5AK5gU+H0EUw7vmKKiXzUqt5kvBuf4CEwXvH AQT1SMJ52rIlDWB7FQFyZeUbOAK2IgY/KNedfK6nsgd/eQVnlofPd2XoddE7kP6iys7jJefw DD3g3rZyDTq7in5dyk5glaNpWZpbHGBs+9SCYLnfQ8XvWqPFOD+gj0plamKANgOvavKTxM7A TQRY2bagAQgA69YtILj8kYxmqPr/M8+MXT7wVoOWVW9lvSmPquCELaDy/NIS7D06VC5EuE/6 JlJXZMTn37NLlyWhzwOgXuXw5w2tyoQQBuvqGiXJijuXwXH7HKdzrc6rpYtAqt5w05hzNrFS KrS0izG64VpWrfproy3BsL+8TBm9brLhhNPynVRqVukbbGzlATTzNQGZ14TTi2/dL6DkMQnM qn4jX9UEe4GdGQBP50bUJSSmeiIkyNLWA+znuN2PZEz930ZwNrF9GtDVw7mzcmpCZ7spldE2 tutbpy9D1bIqxyqBrYDSezyzL2adR1qgHyOTMCHg2AYNkrIQHrSyJxKTpZ1/hqOp8wARAQAB wsBfBBgBAgAJBQJY2bagAhsMAAoJEBRjAa1zdlnghekH/0Yb0iYJ74oID2f/Fj+AJKS2ekQF P2xOr8lpGzgp/+yWUvPtqbX0A33anBJdYwxaAC0NataX3tfZ+oJkzXqfmqhIHMPYHdZesJA2 Bk9hU/33mDl5s5U66/z0uelWzwKVHoQ2O6or4+qF3HJFSJLCe9uvWJ3zXf9F342Ftj73sfx+ 3xkw/IXsN1RqbYqDlzpoEQ99SIEfY/8Jjwnd3sIPfqkuyeaYfe6GJDqKawdCEP1oRRlbXEAp TJgYz8r3nPhGv9cdHNDCk44ISbsqVuxIEnLqi4fTPZaGupiQhT+srl268TTAp2TQW7+6Ce/b NPQorMquzS/LZoyALpmsYi/miMc= In-Reply-To: <170695672373.8914.9293325106328127368@lain.khirnov.net> Subject: Re: [FFmpeg-devel] [PATCH 4/5] avutil/channel_layout: add av_channel_layout_retype() 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 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: On 2/3/2024 7:38 AM, Anton Khirnov wrote: > Quoting James Almer (2024-02-02 13:56:31) >> I wrote a function like this some time ago, but i lost the patch by >> accident during a migration. >> >> The way i approached it was making the return codes reflect if the >> conversion was lossless or not, as in, custom -> native is lossless only >> if channels have no custom names (and possible only if the ids are >> within UINT64_MAX and in order). > >> Anything to Unspec is always lossy, etc. > > Unless the source is custom with every channel unknown. True, and Unspec -> Custom is possible by doing the inverse. > >> Custom -> Ambi: Possible only if it contains ambi channels. Lossless. >> Custom -> Native: Possible only if has no ambi channels and all ids < 64 >> and in order. Lossy if it has custom names, otherwise lossless. >> Ambi -> Custom: Lossless. >> Ambi -> Native: Not possible. >> Native -> Custom: Lossless. >> Native -> Ambi: Not possible. >> Any -> Unspec: Possible but lossy. >> >> So 0 for lossless, 1 for lossy, ENOSYS for not possible. > > That sounds good to me. > > Might also have a flags argument that forces lossless, and for future > extensions. Agree. _______________________________________________ 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".