From a1d8f859ce038a16c47d0f9dceff137d2217883f Mon Sep 17 00:00:00 2001 From: Martin Vignali Date: Sat, 3 Mar 2018 18:38:15 +0100 Subject: [PATCH 5/5] avformat/movenc : add support for writing alpha metadata (ALFA Udta) --- libavformat/movenc.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/libavformat/movenc.c b/libavformat/movenc.c index 5b1e66c897..b9f1080885 100644 --- a/libavformat/movenc.c +++ b/libavformat/movenc.c @@ -3563,6 +3563,35 @@ static int mov_write_raw_metadata_tag(AVFormatContext *s, AVIOContext *pb, return 0; } +/*! Adobe alpha metadata */ +static int mov_write_alpha_metadata_tag(AVFormatContext *s, AVIOContext *pb) +{ + int size; + AVDictionaryEntry *t; + + if (!(t = av_dict_get(s->metadata, "alpha", NULL, 0))) + return 0; + + if (strcmp(t->value, "straight") == 0) { + size = 10 + 8; + avio_wb32(pb, size); + ffio_wfourcc(pb, "ALFA"); + avio_wb16(pb, 1); + avio_wb64(pb, 0); + return size; + } else if (strcmp(t->value, "premult") == 0) { + size = 10 + 8; + avio_wb32(pb, size); + ffio_wfourcc(pb, "ALFA"); + avio_wb16(pb, 1); + avio_wb64(pb, 4294967297); + return size; + } else { + av_log(s, AV_LOG_ERROR, "Unsupported alpha metadata value for ALFA Udta : %s\n", t->value); + return 0; + } +} + static int ascii_to_wc(AVIOContext *pb, const uint8_t *b) { int val; @@ -3668,6 +3697,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov, mov_write_string_metadata(s, pb_buf, "\251xyz", "location", 0); mov_write_string_metadata(s, pb_buf, "\251key", "keywords", 0); mov_write_raw_metadata_tag(s, pb_buf, "XMP_", "xmp"); + mov_write_alpha_metadata_tag(s, pb_buf); } else { /* iTunes meta data */ mov_write_meta_tag(pb_buf, mov, s); -- 2.14.3 (Apple Git-98)