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120 lines
3.6 KiB
120 lines
3.6 KiB
/* |
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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 FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "avio_internal.h" |
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#include "internal.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, uint16_t seq, |
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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 || ff_alloc_extradata(st->codec, len + 8)) |
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return AVERROR_INVALIDDATA; |
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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 AV_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 AV_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 = AV_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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ffio_free_dyn_buf(&sv->pktbuf); |
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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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int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index); |
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if (ret < 0) |
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return ret; |
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*timestamp = sv->timestamp; |
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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 void svq3_close_context(PayloadContext *sv) |
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{ |
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ffio_free_dyn_buf(&sv->pktbuf); |
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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 = AV_CODEC_ID_NONE, // see if (config_packet) above |
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.priv_data_size = sizeof(PayloadContext), |
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.close = svq3_close_context, |
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.parse_packet = svq3_parse_packet, |
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};
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