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commit 5d3cb3dc17245fd9c16f0cb69d8d1076c3410656 Author: Niklas Haas <[email protected]> AuthorDate: Wed Sep 16 20:25:27 2026 +0200 Commit: Niklas Haas <[email protected]> CommitDate: Sun Sep 20 14:41:42 2026 +0000 avformat/mov: read and parse AVAlphaMode from vmhd tag In principle, we could add support for the other graphics modes at a later point in time; but as written, AVAlphaMode only supports the given two modes. Sponsored-by: nxtedition AB Signed-off-by: Niklas Haas <[email protected]> --- libavformat/mov.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/libavformat/mov.c b/libavformat/mov.c index 6abd3f3513..8ddedf269b 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -10007,6 +10007,39 @@ fail: return ret; } +static int mov_read_vmhd(MOVContext *c, AVIOContext *pb, MOVAtom atom) +{ + avio_rb32(pb); // version & flags + uint16_t graphics_mode = avio_rb16(pb); + // ignored: opcolor[3] + + if (c->fc->nb_streams < 1) + return 0; + AVStream *st = c->fc->streams[c->fc->nb_streams - 1]; + if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) + return 0; + + switch (graphics_mode) { + case MOV_GRAPHICS_MODE_COPY: + case MOV_GRAPHICS_MODE_DITHER_COPY: + st->codecpar->alpha_mode = AVALPHA_MODE_UNSPECIFIED; + break; + case MOV_GRAPHICS_MODE_STRAIGHT_ALPHA: + st->codecpar->alpha_mode = AVALPHA_MODE_STRAIGHT; + break; + case MOV_GRAPHICS_MODE_PREMUL_BLACK_ALPHA: + st->codecpar->alpha_mode = AVALPHA_MODE_PREMULTIPLIED; + break; + default: + st->codecpar->alpha_mode = AVALPHA_MODE_UNSPECIFIED; + av_log(c->fc, AV_LOG_WARNING, "Unhandled graphics mode: 0x%x\n", + graphics_mode); + break; + } + + return 0; +} + static const MOVParseTableEntry mov_default_parse_table[] = { { MKTAG('A','C','L','R'), mov_read_aclr }, { MKTAG('A','P','R','G'), mov_read_avid }, @@ -10138,6 +10171,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = { { MKTAG('i','a','c','b'), mov_read_iacb }, #endif { MKTAG('s','r','a','t'), mov_read_srat }, +{ MKTAG('v','m','h','d'), mov_read_vmhd }, { 0, NULL } }; -- To stop receiving notification emails like this one, please contact [email protected]. _______________________________________________ ffmpeg-cvslog mailing list -- [email protected] To unsubscribe send an email to [email protected]
