/* * 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 * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net> * @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization */ #include <string.h> #include "libavutil/intreadwrite.h" #include "avio_internal.h" #include "internal.h" #include "rtp.h" #include "rtpdec.h" #include "rtpdec_formats.h" struct PayloadContext { AVIOContext *pktbuf; int64_t timestamp; }; /** 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, uint16_t seq, 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) { if (len < 2 || ff_alloc_extradata(st->codecpar, len + 8)) return AVERROR_INVALIDDATA; memcpy(st->codecpar->extradata, "SEQH", 4); AV_WB32(st->codecpar->extradata + 4, len); memcpy(st->codecpar->extradata + 8, buf, len); /* We set codec_id to AV_CODEC_ID_NONE initially to * delay decoder initialization since extradata is * carried within the RTP stream, not SDP. Here, * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling * to the decoder that it is OK to initialize. */ st->codecpar->codec_id = AV_CODEC_ID_SVQ3; return AVERROR(EAGAIN); } if (start_packet) { int res; ffio_free_dyn_buf(&sv->pktbuf); if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0) return res; sv->timestamp = *timestamp; } if (!sv->pktbuf) return AVERROR_INVALIDDATA; avio_write(sv->pktbuf, buf, len); if (end_packet) { int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index); if (ret < 0) return ret; *timestamp = sv->timestamp; return 0; } return AVERROR(EAGAIN); } static void svq3_close_context(PayloadContext *sv) { ffio_free_dyn_buf(&sv->pktbuf); } const RTPDynamicProtocolHandler ff_svq3_dynamic_handler = { .enc_name = "X-SV3V-ES", .codec_type = AVMEDIA_TYPE_VIDEO, .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above .priv_data_size = sizeof(PayloadContext), .close = svq3_close_context, .parse_packet = svq3_parse_packet, };