rtpdec: Split handling of mpeg12 audio/video to a separate depacketizer

This also adds checking of mallocs.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 62 insertions, 0 deletions

diff --git a/libavformat/rtpdec_mpeg12.c b/libavformat/rtpdec_mpeg12.c
new file mode 100644
index 0000000000..d111469364
--- /dev/null
+++ b/libavformat/rtpdec_mpeg12.c
@@ -0,0 +1,62 @@
+/*
+ * Common code for the RTP depacketization of MPEG-1/2 formats.
+ * Copyright (c) 2002 Fabrice Bellard
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "rtpdec_formats.h"
+#include "libavutil/intreadwrite.h"
+
+static int mpeg_parse_packet(AVFormatContext *ctx, PayloadContext *data,
+                             AVStream *st, AVPacket *pkt, uint32_t *timestamp,
+                             const uint8_t *buf, int len, uint16_t seq,
+                             int flags)
+{
+    unsigned int h;
+    if (len <= 4)
+        return AVERROR_INVALIDDATA;
+    h    = AV_RB32(buf);
+    buf += 4;
+    len -= 4;
+    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && h & (1 << 26)) {
+        /* MPEG-2 */
+        if (len <= 4)
+            return AVERROR_INVALIDDATA;
+        buf += 4;
+        len -= 4;
+    }
+    if (av_new_packet(pkt, len) < 0)
+        return AVERROR(ENOMEM);
+    memcpy(pkt->data, buf, len);
+    pkt->stream_index = st->index;
+    return 0;
+}
+
+RTPDynamicProtocolHandler ff_mpeg_audio_dynamic_handler = {
+    .codec_type        = AVMEDIA_TYPE_AUDIO,
+    .codec_id          = AV_CODEC_ID_MP3,
+    .parse_packet      = mpeg_parse_packet,
+    .static_payload_id = 14,
+};
+
+RTPDynamicProtocolHandler ff_mpeg_video_dynamic_handler = {
+    .codec_type        = AVMEDIA_TYPE_VIDEO,
+    .codec_id          = AV_CODEC_ID_MPEG2VIDEO,
+    .parse_packet      = mpeg_parse_packet,
+    .static_payload_id = 32,
+};