yading@11: /*
yading@11:  * Sorenson-3 (SVQ3/SV3V) payload for RTP
yading@11:  * Copyright (c) 2010 Ronald S. Bultje
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * @brief RTP support for the SV3V (SVQ3) payload
yading@11:  * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
yading@11:  * @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization
yading@11:  */
yading@11: 
yading@11: #include <string.h>
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "rtp.h"
yading@11: #include "rtpdec.h"
yading@11: #include "rtpdec_formats.h"
yading@11: 
yading@11: struct PayloadContext {
yading@11:     AVIOContext *pktbuf;
yading@11:     int64_t        timestamp;
yading@11: };
yading@11: 
yading@11: /** return 0 on packet, <0 on partial packet or error... */
yading@11: static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
yading@11:                               AVStream *st, AVPacket *pkt,
yading@11:                               uint32_t *timestamp,
yading@11:                               const uint8_t *buf, int len, uint16_t seq,
yading@11:                               int flags)
yading@11: {
yading@11:     int config_packet, start_packet, end_packet;
yading@11: 
yading@11:     if (len < 2)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     config_packet = buf[0] & 0x40;
yading@11:     start_packet  = buf[0] & 0x20;
yading@11:     end_packet    = buf[0] & 0x10;
yading@11:     buf += 2;     // ignore buf[1]
yading@11:     len -= 2;
yading@11: 
yading@11:     if (config_packet) {
yading@11: 
yading@11:         av_freep(&st->codec->extradata);
yading@11:         st->codec->extradata_size = 0;
yading@11: 
yading@11:         if (len < 2 || !(st->codec->extradata =
yading@11:                          av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
yading@11:             return AVERROR_INVALIDDATA;
yading@11: 
yading@11:         st->codec->extradata_size = len + 8;
yading@11:         memcpy(st->codec->extradata, "SEQH", 4);
yading@11:         AV_WB32(st->codec->extradata + 4, len);
yading@11:         memcpy(st->codec->extradata + 8, buf, len);
yading@11: 
yading@11:         /* We set codec_id to AV_CODEC_ID_NONE initially to
yading@11:          * delay decoder initialization since extradata is
yading@11:          * carried within the RTP stream, not SDP. Here,
yading@11:          * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
yading@11:          * to the decoder that it is OK to initialize. */
yading@11:         st->codec->codec_id = AV_CODEC_ID_SVQ3;
yading@11: 
yading@11:         return AVERROR(EAGAIN);
yading@11:     }
yading@11: 
yading@11:     if (start_packet) {
yading@11:         int res;
yading@11: 
yading@11:         if (sv->pktbuf) {
yading@11:             uint8_t *tmp;
yading@11:             avio_close_dyn_buf(sv->pktbuf, &tmp);
yading@11:             av_free(tmp);
yading@11:         }
yading@11:         if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
yading@11:             return res;
yading@11:         sv->timestamp   = *timestamp;
yading@11:     }
yading@11: 
yading@11:     if (!sv->pktbuf)
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     avio_write(sv->pktbuf, buf, len);
yading@11: 
yading@11:     if (end_packet) {
yading@11:         int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
yading@11:         if (ret < 0)
yading@11:             return ret;
yading@11: 
yading@11:         *timestamp        = sv->timestamp;
yading@11:         return 0;
yading@11:     }
yading@11: 
yading@11:     return AVERROR(EAGAIN);
yading@11: }
yading@11: 
yading@11: static PayloadContext *svq3_extradata_new(void)
yading@11: {
yading@11:     return av_mallocz(sizeof(PayloadContext));
yading@11: }
yading@11: 
yading@11: static void svq3_extradata_free(PayloadContext *sv)
yading@11: {
yading@11:     if (sv->pktbuf) {
yading@11:         uint8_t *buf;
yading@11:         avio_close_dyn_buf(sv->pktbuf, &buf);
yading@11:         av_free(buf);
yading@11:     }
yading@11:     av_free(sv);
yading@11: }
yading@11: 
yading@11: RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
yading@11:     .enc_name         = "X-SV3V-ES",
yading@11:     .codec_type       = AVMEDIA_TYPE_VIDEO,
yading@11:     .codec_id         = AV_CODEC_ID_NONE,      // see if (config_packet) above
yading@11:     .alloc            = svq3_extradata_new,
yading@11:     .free             = svq3_extradata_free,
yading@11:     .parse_packet     = svq3_parse_packet,
yading@11: };