mirror of
https://github.com/librempeg/librempeg
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135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/*
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* Sorenson-3 (SVQ3/SV3V) payload for RTP
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* Copyright (c) 2010 Ronald S. Bultje
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @brief RTP support for the SV3V (SVQ3) payload
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* @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization
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*/
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#include <string.h>
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#include "libavutil/intreadwrite.h"
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#include "rtp.h"
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#include "rtpdec.h"
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#include "rtpdec_formats.h"
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struct PayloadContext {
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AVIOContext *pktbuf;
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int64_t timestamp;
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};
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/** return 0 on packet, <0 on partial packet or error... */
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static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
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AVStream *st, AVPacket *pkt,
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uint32_t *timestamp,
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const uint8_t *buf, int len, int flags)
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{
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int config_packet, start_packet, end_packet;
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if (len < 2)
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return AVERROR_INVALIDDATA;
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config_packet = buf[0] & 0x40;
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start_packet = buf[0] & 0x20;
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end_packet = buf[0] & 0x10;
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buf += 2; // ignore buf[1]
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len -= 2;
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if (config_packet) {
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av_freep(&st->codec->extradata);
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st->codec->extradata_size = 0;
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if (len < 2 || !(st->codec->extradata =
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av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE)))
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return AVERROR_INVALIDDATA;
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st->codec->extradata_size = len + 8;
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memcpy(st->codec->extradata, "SEQH", 4);
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AV_WB32(st->codec->extradata + 4, len);
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memcpy(st->codec->extradata + 8, buf, len);
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/* We set codec_id to CODEC_ID_NONE initially to
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* delay decoder initialization since extradata is
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* carried within the RTP stream, not SDP. Here,
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* by setting codec_id to CODEC_ID_SVQ3, we are signalling
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* to the decoder that it is OK to initialize. */
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st->codec->codec_id = CODEC_ID_SVQ3;
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return AVERROR(EAGAIN);
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}
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if (start_packet) {
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int res;
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if (sv->pktbuf) {
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uint8_t *tmp;
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avio_close_dyn_buf(sv->pktbuf, &tmp);
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av_free(tmp);
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}
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if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
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return res;
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sv->timestamp = *timestamp;
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}
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if (!sv->pktbuf)
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return AVERROR_INVALIDDATA;
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avio_write(sv->pktbuf, buf, len);
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if (end_packet) {
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av_init_packet(pkt);
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pkt->stream_index = st->index;
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*timestamp = sv->timestamp;
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pkt->size = avio_close_dyn_buf(sv->pktbuf, &pkt->data);
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pkt->destruct = av_destruct_packet;
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sv->pktbuf = NULL;
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return 0;
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}
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return AVERROR(EAGAIN);
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}
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static PayloadContext *svq3_extradata_new(void)
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{
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return av_mallocz(sizeof(PayloadContext));
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}
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static void svq3_extradata_free(PayloadContext *sv)
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{
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if (sv->pktbuf) {
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uint8_t *buf;
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avio_close_dyn_buf(sv->pktbuf, &buf);
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av_free(buf);
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}
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av_free(sv);
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}
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RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
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.enc_name = "X-SV3V-ES",
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.codec_type = AVMEDIA_TYPE_VIDEO,
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.codec_id = CODEC_ID_NONE, // see if (config_packet) above
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.alloc = svq3_extradata_new,
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.free = svq3_extradata_free,
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.parse_packet = svq3_parse_packet,
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};
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