| /* |
| * 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 "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, 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->codec->extradata); |
| st->codec->extradata_size = 0; |
| |
| if (len < 2 || !(st->codec->extradata = |
| av_malloc(len + 8 + FF_INPUT_BUFFER_PADDING_SIZE))) |
| return AVERROR_INVALIDDATA; |
| |
| st->codec->extradata_size = len + 8; |
| memcpy(st->codec->extradata, "SEQH", 4); |
| AV_WB32(st->codec->extradata + 4, len); |
| memcpy(st->codec->extradata + 8, buf, len); |
| |
| /* We set codec_id to CODEC_ID_NONE initially to |
| * delay decoder initialization since extradata is |
| * carried within the RTP stream, not SDP. Here, |
| * by setting codec_id to CODEC_ID_SVQ3, we are signalling |
| * to the decoder that it is OK to initialize. */ |
| st->codec->codec_id = CODEC_ID_SVQ3; |
| |
| return AVERROR(EAGAIN); |
| } |
| |
| if (start_packet) { |
| int res; |
| |
| if (sv->pktbuf) { |
| uint8_t *tmp; |
| avio_close_dyn_buf(sv->pktbuf, &tmp); |
| av_free(tmp); |
| } |
| 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) { |
| av_init_packet(pkt); |
| pkt->stream_index = st->index; |
| *timestamp = sv->timestamp; |
| pkt->size = avio_close_dyn_buf(sv->pktbuf, &pkt->data); |
| pkt->destruct = av_destruct_packet; |
| sv->pktbuf = NULL; |
| return 0; |
| } |
| |
| return AVERROR(EAGAIN); |
| } |
| |
| static PayloadContext *svq3_extradata_new(void) |
| { |
| return av_mallocz(sizeof(PayloadContext)); |
| } |
| |
| static void svq3_extradata_free(PayloadContext *sv) |
| { |
| if (sv->pktbuf) { |
| uint8_t *buf; |
| avio_close_dyn_buf(sv->pktbuf, &buf); |
| av_free(buf); |
| } |
| av_free(sv); |
| } |
| |
| RTPDynamicProtocolHandler ff_svq3_dynamic_handler = { |
| .enc_name = "X-SV3V-ES", |
| .codec_type = AVMEDIA_TYPE_VIDEO, |
| .codec_id = CODEC_ID_NONE, // see if (config_packet) above |
| .alloc = svq3_extradata_new, |
| .free = svq3_extradata_free, |
| .parse_packet = svq3_parse_packet, |
| }; |