avcodec: add AV1 packet split API

Signed-off-by: James Almer <jamrial@gmail.com>

1 files changed, 103 insertions, 0 deletions

diff --git a/libavcodec/av1_parse.c b/libavcodec/av1_parse.c
new file mode 100644
index 0000000..48feb9f
--- /dev/null
+++ b/libavcodec/av1_parse.c
@@ -0,0 +1,103 @@
+/*
+ * AV1 common parsing code
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include "libavutil/mem.h"
+
+#include "av1_parse.h"
+#include "bytestream.h"
+
+int ff_av1_extract_obu(AV1OBU *obu, const uint8_t *buf, int length, void *logctx)
+{
+    int64_t obu_size;
+    int start_pos, type, temporal_id, spatial_id;
+
+    int ret = parse_obu_header(buf, length, &obu_size, &start_pos,
+                               &type, &temporal_id, &spatial_id);
+    if (ret < 0)
+        return ret;
+
+    if (obu_size > INT_MAX / 8 || obu_size < 0)
+        return AVERROR(ERANGE);
+
+    obu->type        = type;
+    obu->temporal_id = temporal_id;
+    obu->spatial_id  = spatial_id;
+
+    length = obu_size + start_pos;
+
+    obu->data     = buf + start_pos;
+    obu->size     = obu_size;
+    obu->raw_data = buf;
+    obu->raw_size = length;
+
+    ret = init_get_bits(&obu->gb, obu->data, obu->size * 8);
+    if (ret < 0)
+        return ret;
+
+    av_log(logctx, AV_LOG_DEBUG,
+           "obu_type: %d, temporal_id: %d, spatial_id: %d, payload size: %d\n",
+           obu->type, obu->temporal_id, obu->spatial_id, obu->size);
+
+    return length;
+}
+
+int ff_av1_packet_split(AV1Packet *pkt, const uint8_t *buf, int length, void *logctx)
+{
+    GetByteContext bc;
+    int consumed;
+
+    bytestream2_init(&bc, buf, length);
+    pkt->nb_obus = 0;
+
+    while (bytestream2_get_bytes_left(&bc) > 0) {
+        AV1OBU *obu;
+
+        if (pkt->obus_allocated < pkt->nb_obus + 1) {
+            int new_size = pkt->obus_allocated + 1;
+            AV1OBU *tmp = av_realloc_array(pkt->obus, new_size, sizeof(*tmp));
+            if (!tmp)
+                return AVERROR(ENOMEM);
+
+            pkt->obus = tmp;
+            memset(pkt->obus + pkt->obus_allocated, 0,
+                   (new_size - pkt->obus_allocated) * sizeof(*tmp));
+            pkt->obus_allocated = new_size;
+        }
+        obu = &pkt->obus[pkt->nb_obus];
+
+        consumed = ff_av1_extract_obu(obu, bc.buffer, bytestream2_get_bytes_left(&bc), logctx);
+        if (consumed < 0)
+            return consumed;
+
+        pkt->nb_obus++;
+
+        bytestream2_skip(&bc, consumed);
+    }
+
+    return 0;
+}
+
+void ff_av1_packet_uninit(AV1Packet *pkt)
+{
+    av_freep(&pkt->obus);
+    pkt->obus_allocated = 0;
+}