Add RTP depacketization of SVQ3

Patch by Josh Allmann, joshua dot allmann at gmail

Originally committed as revision 23941 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 138 insertions, 0 deletions

diff --git a/libavformat/rtpdec_svq3.c b/libavformat/rtpdec_svq3.c
new file mode 100644
index 0000000000..a285036997
--- /dev/null
+++ b/libavformat/rtpdec_svq3.c
@@ -0,0 +1,138 @@
+/*
+ * Sorenson-3 (SVQ3/SV3V) payload for RTP
+ * Copyright (c) 2010 Ronald S. Bultje
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * @brief RTP support for the SV3V (SVQ3) payload
+ * (http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization)
+ * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
+ */
+
+#include <string.h>
+#include <libavcodec/get_bits.h>
+#include "rtp.h"
+#include "rtpdec.h"
+#include "rtpdec_svq3.h"
+
+struct PayloadContext {
+    ByteIOContext *pktbuf;
+    int64_t        timestamp;
+    int            is_keyframe;
+};
+
+/** return 0 on packet, <0 on partial packet or error... */
+static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
+                              AVStream *st, AVPacket *pkt,
+                              uint32_t *timestamp,
+                              const uint8_t *buf, int len, int flags)
+{
+    int config_packet, start_packet, end_packet;
+
+    if (len < 2)
+        return AVERROR_INVALIDDATA;
+
+    config_packet = buf[0] & 0x40;
+    start_packet  = buf[0] & 0x20;
+    end_packet    = buf[0] & 0x10;
+    buf += 2;     // ignore buf[1]
+    len -= 2;
+
+    if (config_packet) {
+
+        av_freep(&st->codec->extradata);
+        st->codec->extradata_size = 0;
+
+        if (len < 2 || !(st->codec->extradata =
+                         av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
+            return AVERROR_INVALIDDATA;
+
+        st->codec->extradata_size = len + 8;
+        memcpy(st->codec->extradata, "SEQH", 4);
+        AV_WB32(st->codec->extradata + 4, len);
+        memcpy(st->codec->extradata + 8, buf, len);
+
+        /* We set codec_id to CODEC_ID_NONE initially to
+         * delay decoder initialization since extradata is
+         * carried within the RTP stream, not SDP. Here,
+         * by setting codec_id to CODEC_ID_SVQ3, we are signalling
+         * to the decoder that it is OK to initialize. */
+        st->codec->codec_id = CODEC_ID_SVQ3;
+
+        return AVERROR(EAGAIN);
+    }
+
+    if (start_packet) {
+        int res;
+
+        if (sv->pktbuf) {
+            uint8_t *tmp;
+            url_close_dyn_buf(sv->pktbuf, &tmp);
+            av_free(tmp);
+        }
+        if ((res = url_open_dyn_buf(&sv->pktbuf)) < 0)
+            return res;
+        sv->timestamp   = *timestamp;
+        sv->is_keyframe = flags & RTP_FLAG_KEY;
+    }
+
+    if (!sv->pktbuf)
+        return AVERROR_INVALIDDATA;
+
+    put_buffer(sv->pktbuf, buf, len);
+
+    if (end_packet) {
+        av_init_packet(pkt);
+        pkt->stream_index = st->index;
+        pkt->pts          = sv->timestamp;
+        pkt->flags        = sv->is_keyframe ? AV_PKT_FLAG_KEY : 0;
+        pkt->size         = url_close_dyn_buf(sv->pktbuf, &pkt->data);
+        pkt->destruct     = av_destruct_packet;
+        sv->pktbuf        = NULL;
+        return 0;
+    }
+
+    return AVERROR(EAGAIN);
+}
+
+static PayloadContext *svq3_extradata_new(void)
+{
+    return av_mallocz(sizeof(PayloadContext));
+}
+
+static void svq3_extradata_free(PayloadContext *sv)
+{
+    if (sv->pktbuf) {
+        uint8_t *buf;
+        url_close_dyn_buf(sv->pktbuf, &buf);
+        av_free(buf);
+    }
+    av_free(sv);
+}
+
+RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
+    "X-SV3V-ES",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_NONE,          // see if (config_packet) above
+    NULL,                   // parse sdp line
+    svq3_extradata_new,
+    svq3_extradata_free,
+    svq3_parse_packet,
+};