Add RTP/H.263 depacketizer by Martin Storsjö <$firstname () $firstname st>.

Originally committed as revision 21512 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -50,6 +50,7 @@ version <next>:
 - Deluxe Paint Animation playback system
 - SIPR decoder
 - Adobe Filmstrip muxer and demuxer
+- RTP depacketization of H.263
 
 
 

libavformat/Makefile

@@ -213,6 +213,7 @@ OBJS-$(CONFIG_SDP_DEMUXER)               += rtsp.o        \
                                             rdt.o         \
                                             rtp.o         \
                                             rtpdec.o      \
+                                            rtpdec_h263.o \
                                             rtp_asf.o     \
                                             rtp_h264.o    \
                                             rtp_vorbis.o

libavformat/avformat.h

@@ -22,7 +22,7 @@
 #define AVFORMAT_AVFORMAT_H
 
 #define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 47
+#define LIBAVFORMAT_VERSION_MINOR 48
 #define LIBAVFORMAT_VERSION_MICRO  0
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \

libavformat/rtpdec.c

@@ -33,6 +33,7 @@
 #include "rtp_asf.h"
 #include "rtp_h264.h"
 #include "rtp_vorbis.h"
+#include "rtpdec_h263.h"
 
 //#define DEBUG
 
@@ -61,6 +62,8 @@ void av_register_rtp_dynamic_payload_handlers(void)
 {
     ff_register_dynamic_payload_handler(&mp4v_es_handler);
     ff_register_dynamic_payload_handler(&mpeg4_generic_handler);
+    ff_register_dynamic_payload_handler(&ff_h263_1998_dynamic_handler);
+    ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
     ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
     ff_register_dynamic_payload_handler(&ff_vorbis_dynamic_handler);
 
@@ -301,6 +304,7 @@ RTPDemuxContext *rtp_parse_open(AVFormatContext *s1, AVStream *st, URLContext *r
         case CODEC_ID_MP2:
         case CODEC_ID_MP3:
         case CODEC_ID_MPEG4:
+        case CODEC_ID_H263:
         case CODEC_ID_H264:
             st->need_parsing = AVSTREAM_PARSE_FULL;
             break;

libavformat/rtpdec_h263.c

@@ -0,0 +1,108 @@
+/*
+ * RTP H.263 Depacketizer, RFC 4629
+ * Copyright (c) 2010 Martin Storsjo
+ *
+ * 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 "avformat.h"
+#include "rtpdec_h263.h"
+#include "libavutil/intreadwrite.h"
+
+static int h263_handle_packet(AVFormatContext *ctx,
+                              PayloadContext *data,
+                              AVStream *st,
+                              AVPacket * pkt,
+                              uint32_t * timestamp,
+                              const uint8_t * buf,
+                              int len, int flags)
+{
+    uint8_t *ptr;
+    uint16_t header;
+    int startcode, vrc, picture_header;
+
+    if (len < 2) {
+        av_log(ctx, AV_LOG_ERROR, "Too short H.263 RTP packet\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* Decode the 16 bit H.263+ payload header, as described in section
+     * 5.1 of RFC 4629. The fields of this header are:
+     * - 5 reserved bits, should be ignored.
+     * - One bit (P, startcode), indicating a picture start, picture segment
+     *   start or video sequence end. If set, two zero bytes should be
+     *   prepended to the payload.
+     * - One bit (V, vrc), indicating the presence of an 8 bit Video
+     *   Redundancy Coding field after this 16 bit header.
+     * - 6 bits (PLEN, picture_header), the length (in bytes) of an extra
+     *   picture header, following the VRC field.
+     * - 3 bits (PEBIT), the number of bits to ignore of the last byte
+     *   of the extra picture header. (Not used at the moment.)
+     */
+    header = AV_RB16(buf);
+    startcode      = (header & 0x0400) >> 9;
+    vrc            =  header & 0x0200;
+    picture_header = (header & 0x01f8) >> 3;
+    buf += 2;
+    len -= 2;
+
+    if (vrc) {
+        /* Skip VRC header if present, not used at the moment. */
+        buf += 1;
+        len -= 1;
+    }
+    if (picture_header) {
+        /* Skip extra picture header if present, not used at the moment. */
+        buf += picture_header;
+        len -= picture_header;
+    }
+
+    if (len < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Too short H.263 RTP packet\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (av_new_packet(pkt, len + startcode)) {
+        av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
+        return AVERROR_NOMEM;
+    }
+    pkt->stream_index = st->index;
+    ptr = pkt->data;
+
+    if (startcode) {
+        *ptr++ = 0;
+        *ptr++ = 0;
+    }
+    memcpy(ptr, buf, len);
+
+    return 0;
+}
+
+RTPDynamicProtocolHandler ff_h263_1998_dynamic_handler = {
+    .enc_name         = "H263-1998",
+    .codec_type       = CODEC_TYPE_VIDEO,
+    .codec_id         = CODEC_ID_H263,
+    .parse_packet     = h263_handle_packet,
+};
+
+RTPDynamicProtocolHandler ff_h263_2000_dynamic_handler = {
+    .enc_name         = "H263-2000",
+    .codec_type       = CODEC_TYPE_VIDEO,
+    .codec_id         = CODEC_ID_H263,
+    .parse_packet     = h263_handle_packet,
+};
+

libavformat/rtpdec_h263.h

@@ -0,0 +1,30 @@
+/*
+ * RTP H.263 Depacketizer, RFC 4629
+ * Copyright (c) 2010 Martin Storsjo
+ *
+ * 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
+ */
+
+#ifndef AVFORMAT_RTPDEC_H263_H
+#define AVFORMAT_RTPDEC_H263_H
+
+#include "rtpdec.h"
+
+extern RTPDynamicProtocolHandler ff_h263_1998_dynamic_handler;
+extern RTPDynamicProtocolHandler ff_h263_2000_dynamic_handler;
+
+#endif /* AVFORMAT_RTPDEC_H263_H */