---
libavcodec/cbs_h264.h | 19 +++++++++++
libavcodec/cbs_h2645.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 108 insertions(+)
diff --git a/libavcodec/cbs_h264.h b/libavcodec/cbs_h264.h
index 14ea69ae2..8c17680bb 100644
--- a/libavcodec/cbs_h264.h
+++ b/libavcodec/cbs_h264.h
@@ -22,6 +22,7 @@
#include <stddef.h>
#include <stdint.h>
+#include "cbs.h"
#include "cbs_h2645.h"
#include "h264.h"
@@ -428,4 +429,22 @@ typedef struct CodedBitstreamH264Context {
} CodedBitstreamH264Context;
+/**
+ * Add an SEI message to an access unit.
+ */
+int ff_cbs_h264_add_sei_message(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *access_unit,
+ const H264RawSEIPayload *payload);
+
+/**
+ * Delete an SEI message from an access unit.
+ *
+ * Deletes from nal_unit, which must be an SEI NAL unit. If this is the
+ * last message in nal_unit, also deletes it from access_unit.
+ */
+int ff_cbs_h264_delete_sei_message(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *access_unit,
+ CodedBitstreamUnit *nal_unit,
+ int position);
+
#endif /* AVCODEC_CBS_H264_H */
diff --git a/libavcodec/cbs_h2645.c b/libavcodec/cbs_h2645.c
index c98bab998..7b2e1b532 100644
--- a/libavcodec/cbs_h2645.c
+++ b/libavcodec/cbs_h2645.c
@@ -1394,3 +1394,92 @@ const CodedBitstreamType ff_cbs_type_h265 = {
.close = &cbs_h265_close,
};
+
+int ff_cbs_h264_add_sei_message(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *au,
+ const H264RawSEIPayload *payload)
+{
+ H264RawSEI *sei;
+ CodedBitstreamUnit *nal = NULL;
+ int err, i;
+
+ // Find an existing SEI NAL unit to add to.
+ for (i = 0; i < au->nb_units; i++) {
+ if (au->units[i].type == H264_NAL_SEI) {
+ nal = &au->units[i];
+ break;
+ }
+ }
+ if (nal) {
+ sei = nal->content;
+
+ } else {
+ // Need to make a new SEI NAL unit. Insert it before the first
+ // slice data NAL unit; if no slice data, add at the end.
+ AVBufferRef *sei_ref;
+
+ sei_ref = av_buffer_allocz(sizeof(*sei));
+ if (!sei_ref)
+ return AVERROR(ENOMEM);
+ sei = (H264RawSEI*)sei_ref->data;
+
+ sei->nal_unit_header.nal_unit_type = H264_NAL_SEI;
+ sei->nal_unit_header.nal_ref_idc = 0;
+
+ for (i = 0; i < au->nb_units; i++) {
+ if (au->units[i].type == H264_NAL_SLICE ||
+ au->units[i].type == H264_NAL_IDR_SLICE)
+ break;
+ }
+
+ err = ff_cbs_insert_unit_content(ctx, au, i, H264_NAL_SEI,
+ sei, sei_ref);
+ av_buffer_unref(&sei_ref);
+ if (err < 0)
+ return err;
+ }
+
+ if (sei->payload_count >= H264_MAX_SEI_PAYLOADS) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many payloads in "
+ "SEI NAL unit.\n");
+ return AVERROR(EINVAL);
+ }
+
+ memcpy(&sei->payload[sei->payload_count], payload, sizeof(*payload));
+ ++sei->payload_count;
+
+ return 0;
+}
+
+int ff_cbs_h264_delete_sei_message(CodedBitstreamContext *ctx,
+ CodedBitstreamFragment *au,
+ CodedBitstreamUnit *nal,
+ int position)
+{
+ H264RawSEI *sei = nal->content;
+
+ av_assert0(nal->type == H264_NAL_SEI);
+ av_assert0(position >= 0 && position < sei->payload_count);
+
+ if (position == 0 && sei->payload_count == 1) {
+ // Deleting NAL unit entirely.
+ int i;
+
+ for (i = 0; i < au->nb_units; i++) {
+ if (&au->units[i] == nal)
+ break;
+ }
+ av_assert0(i < au->nb_units && "NAL unit not in access unit.");
+
+ return ff_cbs_delete_unit(ctx, au, i);
+ } else {
+ cbs_h264_free_sei_payload(&sei->payload[position]);
+
+ --sei->payload_count;
+ memmove(sei->payload + position,
+ sei->payload + position + 1,
+ (sei->payload_count - position) * sizeof(*sei->payload));
+
+ return 0;
+ }
+}
--
2.15.1
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