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| 4349 | Serge | 1 | /* |
| 2 | * Sorenson-3 (SVQ3/SV3V) payload for RTP |
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| 3 | * Copyright (c) 2010 Ronald S. Bultje |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * @brief RTP support for the SV3V (SVQ3) payload |
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| 25 | * @author Ronald S. Bultje |
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| 26 | * @see http://wiki.multimedia.cx/index.php?title=Sorenson_Video_3#Packetization |
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| 27 | */ |
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| 28 | |||
| 29 | #include |
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| 30 | #include "libavutil/intreadwrite.h" |
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| 31 | #include "internal.h" |
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| 32 | #include "rtp.h" |
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| 33 | #include "rtpdec.h" |
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| 34 | #include "rtpdec_formats.h" |
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| 35 | |||
| 36 | struct PayloadContext { |
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| 37 | AVIOContext *pktbuf; |
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| 38 | int64_t timestamp; |
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| 39 | }; |
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| 40 | |||
| 41 | /** return 0 on packet, <0 on partial packet or error... */ |
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| 42 | static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv, |
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| 43 | AVStream *st, AVPacket *pkt, |
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| 44 | uint32_t *timestamp, |
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| 45 | const uint8_t *buf, int len, uint16_t seq, |
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| 46 | int flags) |
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| 47 | { |
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| 48 | int config_packet, start_packet, end_packet; |
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| 49 | |||
| 50 | if (len < 2) |
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| 51 | return AVERROR_INVALIDDATA; |
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| 52 | |||
| 53 | config_packet = buf[0] & 0x40; |
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| 54 | start_packet = buf[0] & 0x20; |
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| 55 | end_packet = buf[0] & 0x10; |
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| 56 | buf += 2; // ignore buf[1] |
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| 57 | len -= 2; |
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| 58 | |||
| 59 | if (config_packet) { |
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| 60 | |||
| 61 | av_freep(&st->codec->extradata); |
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| 62 | st->codec->extradata_size = 0; |
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| 63 | |||
| 64 | if (len < 2 || ff_alloc_extradata(st->codec, len + 8)) |
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| 65 | return AVERROR_INVALIDDATA; |
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| 66 | |||
| 67 | memcpy(st->codec->extradata, "SEQH", 4); |
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| 68 | AV_WB32(st->codec->extradata + 4, len); |
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| 69 | memcpy(st->codec->extradata + 8, buf, len); |
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| 70 | |||
| 71 | /* We set codec_id to AV_CODEC_ID_NONE initially to |
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| 72 | * delay decoder initialization since extradata is |
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| 73 | * carried within the RTP stream, not SDP. Here, |
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| 74 | * by setting codec_id to AV_CODEC_ID_SVQ3, we are signalling |
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| 75 | * to the decoder that it is OK to initialize. */ |
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| 76 | st->codec->codec_id = AV_CODEC_ID_SVQ3; |
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| 77 | |||
| 78 | return AVERROR(EAGAIN); |
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| 79 | } |
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| 80 | |||
| 81 | if (start_packet) { |
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| 82 | int res; |
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| 83 | |||
| 84 | if (sv->pktbuf) { |
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| 85 | uint8_t *tmp; |
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| 86 | avio_close_dyn_buf(sv->pktbuf, &tmp); |
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| 87 | av_free(tmp); |
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| 88 | } |
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| 89 | if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0) |
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| 90 | return res; |
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| 91 | sv->timestamp = *timestamp; |
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| 92 | } |
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| 93 | |||
| 94 | if (!sv->pktbuf) |
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| 95 | return AVERROR_INVALIDDATA; |
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| 96 | |||
| 97 | avio_write(sv->pktbuf, buf, len); |
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| 98 | |||
| 99 | if (end_packet) { |
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| 100 | int ret = ff_rtp_finalize_packet(pkt, &sv->pktbuf, st->index); |
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| 101 | if (ret < 0) |
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| 102 | return ret; |
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| 103 | |||
| 104 | *timestamp = sv->timestamp; |
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| 105 | return 0; |
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| 106 | } |
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| 107 | |||
| 108 | return AVERROR(EAGAIN); |
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| 109 | } |
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| 110 | |||
| 111 | static PayloadContext *svq3_extradata_new(void) |
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| 112 | { |
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| 113 | return av_mallocz(sizeof(PayloadContext)); |
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| 114 | } |
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| 115 | |||
| 116 | static void svq3_extradata_free(PayloadContext *sv) |
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| 117 | { |
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| 118 | if (sv->pktbuf) { |
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| 119 | uint8_t *buf; |
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| 120 | avio_close_dyn_buf(sv->pktbuf, &buf); |
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| 121 | av_free(buf); |
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| 122 | } |
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| 123 | av_free(sv); |
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| 124 | } |
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| 125 | |||
| 126 | RTPDynamicProtocolHandler ff_svq3_dynamic_handler = { |
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| 127 | .enc_name = "X-SV3V-ES", |
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| 128 | .codec_type = AVMEDIA_TYPE_VIDEO, |
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| 129 | .codec_id = AV_CODEC_ID_NONE, // see if (config_packet) above |
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| 130 | .alloc = svq3_extradata_new, |
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| 131 | .free = svq3_extradata_free, |
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| 132 | .parse_packet = svq3_parse_packet, |
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| 133 | }; |