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  1. /*
  2.  * Sorenson-3 (SVQ3/SV3V) payload for RTP
  3.  * Copyright (c) 2010 Ronald S. Bultje
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * @brief RTP support for the SV3V (SVQ3) payload
  25.  * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
  26.  * @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization
  27.  */
  28.  
  29. #include <string.h>
  30. #include "libavutil/intreadwrite.h"
  31. #include "avio_internal.h"
  32. #include "internal.h"
  33. #include "rtp.h"
  34. #include "rtpdec.h"
  35. #include "rtpdec_formats.h"
  36.  
  37. struct PayloadContext {
  38.     AVIOContext *pktbuf;
  39.     int64_t        timestamp;
  40. };
  41.  
  42. /** return 0 on packet, <0 on partial packet or error... */
  43. static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
  44.                               AVStream *st, AVPacket *pkt,
  45.                               uint32_t *timestamp,
  46.                               const uint8_t *buf, int len, uint16_t seq,
  47.                               int flags)
  48. {
  49.     int config_packet, start_packet, end_packet;
  50.  
  51.     if (len < 2)
  52.         return AVERROR_INVALIDDATA;
  53.  
  54.     config_packet = buf[0] & 0x40;
  55.     start_packet  = buf[0] & 0x20;
  56.     end_packet    = buf[0] & 0x10;
  57.     buf += 2;     // ignore buf[1]
  58.     len -= 2;
  59.  
  60.     if (config_packet) {
  61.  
  62.         av_freep(&st->codec->extradata);
  63.         st->codec->extradata_size = 0;
  64.  
  65.         if (len < 2 || ff_alloc_extradata(st->codec, len + 8))
  66.             return AVERROR_INVALIDDATA;
  67.  
  68.         memcpy(st->codec->extradata, "SEQH", 4);
  69.         AV_WB32(st->codec->extradata + 4, len);
  70.         memcpy(st->codec->extradata + 8, buf, len);
  71.  
  72.         /* We set codec_id to AV_CODEC_ID_NONE initially to
  73.          * delay decoder initialization since extradata is
  74.          * carried within the RTP stream, not SDP. Here,
  75.          * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling
  76.          * to the decoder that it is OK to initialize. */
  77.         st->codec->codec_id = AV_CODEC_ID_SVQ3;
  78.  
  79.         return AVERROR(EAGAIN);
  80.     }
  81.  
  82.     if (start_packet) {
  83.         int res;
  84.  
  85.         ffio_free_dyn_buf(&sv->pktbuf);
  86.         if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
  87.             return res;
  88.         sv->timestamp   = *timestamp;
  89.     }
  90.  
  91.     if (!sv->pktbuf)
  92.         return AVERROR_INVALIDDATA;
  93.  
  94.     avio_write(sv->pktbuf, buf, len);
  95.  
  96.     if (end_packet) {
  97.         int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index);
  98.         if (ret < 0)
  99.             return ret;
  100.  
  101.         *timestamp        = sv->timestamp;
  102.         return 0;
  103.     }
  104.  
  105.     return AVERROR(EAGAIN);
  106. }
  107.  
  108. static void svq3_close_context(PayloadContext *sv)
  109. {
  110.     ffio_free_dyn_buf(&sv->pktbuf);
  111. }
  112.  
  113. RTPDynamicProtocolHandler ff_svq3_dynamic_handler = {
  114.     .enc_name         = "X-SV3V-ES",
  115.     .codec_type       = AVMEDIA_TYPE_VIDEO,
  116.     .codec_id         = AV_CODEC_ID_NONE,      // see if (config_packet) above
  117.     .priv_data_size   = sizeof(PayloadContext),
  118.     .close            = svq3_close_context,
  119.     .parse_packet     = svq3_parse_packet,
  120. };
  121.