aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* 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) {
av_freep(&st->codecpar->extradata);
st->codecpar->extradata_size = 0;
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,
};
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