This adds support for the EventMessage box, which is apparently described in ISO/IEC 23009-1:2019, and is used for KLV metadata per MISB ST 1910. See https://www.gwg.nga.mil/misb/docs/standards/ST1910.1.pdf Sect 6.2.1 --- libavformat/isom.h | 15 ++++++++++++ libavformat/mov.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+)
diff --git a/libavformat/isom.h b/libavformat/isom.h index 5a6d504090..8ea62e91f0 100644 --- a/libavformat/isom.h +++ b/libavformat/isom.h @@ -79,6 +79,18 @@ typedef struct MOVDref { int16_t nlvl_to, nlvl_from; } MOVDref; +typedef struct MOVEmsg { + uint8_t version; + uint32_t timescale; + uint32_t presentation_time_delta; ///< only valid for version 0 + uint64_t presentation_time; ///< only valid for version 1 + uint32_t event_duration; + uint32_t id; + char *scheme_id_uri; + char *value; + uint8_t *message_data; +} MOVEmsg; + typedef struct MOVAtom { uint32_t type; int64_t size; /* total size (excluding the size and type fields) */ @@ -297,6 +309,9 @@ typedef struct MOVContext { int32_t movie_display_matrix[3][3]; ///< display matrix from mvhd int have_read_mfra_size; uint32_t mfra_size; + // Event Messages from DASH specification, used in MISB ST 1910 + unsigned emsg_count; ///< Number of event messages + MOVEmsg *emsg_data; ///< Array of Event Messages } MOVContext; int ff_mp4_read_descr_len(AVIOContext *pb); diff --git a/libavformat/mov.c b/libavformat/mov.c index 7805330bf9..22bf0b36ea 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -5318,6 +5318,66 @@ static int mov_read_elst(MOVContext *c, AVIOContext *pb, MOVAtom atom) return 0; } +static int mov_read_emsg(MOVContext *c, AVIOContext *pb, MOVAtom atom) +{ + int err; + uint32_t bytes_read_from_atom = 0; + size_t num_bytes_in_last_read; + MOVEmsg *emsg; + + if ((uint64_t)c->emsg_count+1 >= UINT_MAX / sizeof(*c->emsg_data)) + return AVERROR_INVALIDDATA; + if ((err = av_reallocp_array(&c->emsg_data, c->emsg_count + 1, + sizeof(*c->emsg_data))) < 0) { + c->emsg_count = 0; + return err; + } + emsg = &c->emsg_data[c->emsg_count++]; + + emsg->version = avio_r8(pb); + bytes_read_from_atom += 1; + avio_rb24(pb); /* flags */ + bytes_read_from_atom += 3; + if (emsg->version == 0) { + emsg->scheme_id_uri = av_malloc(atom.size + 1); + num_bytes_in_last_read = avio_get_str(pb, atom.size, emsg->scheme_id_uri, pb->buffer_size + 1); + bytes_read_from_atom += num_bytes_in_last_read; + av_realloc(emsg->scheme_id_uri, num_bytes_in_last_read); + emsg->value = av_malloc(atom.size + 1); + num_bytes_in_last_read = avio_get_str(pb, atom.size, emsg->value, pb->buffer_size + 1); + bytes_read_from_atom += num_bytes_in_last_read; + av_realloc(emsg->value, num_bytes_in_last_read); + emsg->timescale = avio_rb32(pb); + bytes_read_from_atom += 4; + emsg->presentation_time_delta = avio_rb32(pb); + bytes_read_from_atom += 4; + emsg->event_duration = avio_rb32(pb); + bytes_read_from_atom += 4; + emsg->id = avio_rb32(pb); + bytes_read_from_atom += 4; + } else if (emsg->version == 1) { + emsg->timescale = avio_rb32(pb); + bytes_read_from_atom += 4; + emsg->presentation_time = avio_rb64(pb); + bytes_read_from_atom += 8; + emsg->event_duration = avio_rb32(pb); + bytes_read_from_atom += 4; + emsg->id = avio_rb32(pb); + bytes_read_from_atom += 4; + emsg->scheme_id_uri = av_malloc(atom.size + 1); + num_bytes_in_last_read = avio_get_str(pb, atom.size, emsg->scheme_id_uri, pb->buffer_size + 1); + bytes_read_from_atom += num_bytes_in_last_read; + av_realloc(emsg->scheme_id_uri, num_bytes_in_last_read); + emsg->value = av_malloc(atom.size + 1); + num_bytes_in_last_read = avio_get_str(pb, atom.size, emsg->value, pb->buffer_size + 1); + bytes_read_from_atom += num_bytes_in_last_read; + av_realloc(emsg->value, num_bytes_in_last_read); + } + emsg->message_data = av_malloc(atom.size - bytes_read_from_atom); + num_bytes_in_last_read = avio_read(pb, emsg->message_data, atom.size - bytes_read_from_atom); + return 0; +} + static int mov_read_tmcd(MOVContext *c, AVIOContext *pb, MOVAtom atom) { MOVStreamContext *sc; @@ -6895,6 +6955,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = { { MKTAG('d','r','e','f'), mov_read_dref }, { MKTAG('e','d','t','s'), mov_read_default }, { MKTAG('e','l','s','t'), mov_read_elst }, +{ MKTAG('e','m','s','g'), mov_read_emsg }, { MKTAG('e','n','d','a'), mov_read_enda }, { MKTAG('f','i','e','l'), mov_read_fiel }, { MKTAG('a','d','r','m'), mov_read_adrm }, -- 2.27.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".