blob: de99d277950c8a0e77cce46c4285e07a7ef4aaf4
| 1 | /* |
| 2 | * RTP parser for DV payload format (RFC 6469) |
| 3 | * Copyright (c) 2015 Thomas Volkert <thomas@homer-conferencing.com> |
| 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 | #include "libavutil/avstring.h" |
| 23 | |
| 24 | #include "libavcodec/bytestream.h" |
| 25 | |
| 26 | #include "avio_internal.h" |
| 27 | #include "rtpdec_formats.h" |
| 28 | |
| 29 | struct PayloadContext { |
| 30 | AVIOContext *buf; |
| 31 | uint32_t timestamp; |
| 32 | int bundled_audio; |
| 33 | }; |
| 34 | |
| 35 | static av_cold void dv_close_context(PayloadContext *data) |
| 36 | { |
| 37 | ffio_free_dyn_buf(&data->buf); |
| 38 | } |
| 39 | |
| 40 | static av_cold int dv_sdp_parse_fmtp_config(AVFormatContext *s, |
| 41 | AVStream *stream, |
| 42 | PayloadContext *dv_data, |
| 43 | const char *attr, const char *value) |
| 44 | { |
| 45 | /* does the DV stream include audio? */ |
| 46 | if (!strcmp(attr, "audio") && !strcmp(value, "bundled")) |
| 47 | dv_data->bundled_audio = 1; |
| 48 | |
| 49 | /* extract the DV profile */ |
| 50 | if (!strcmp(attr, "encode")) { |
| 51 | /* SD-VCR/525-60 */ |
| 52 | /* SD-VCR/625-50 */ |
| 53 | /* HD-VCR/1125-60 */ |
| 54 | /* HD-VCR/1250-50 */ |
| 55 | /* SDL-VCR/525-60 */ |
| 56 | /* SDL-VCR/625-50 */ |
| 57 | /* 314M-25/525-60 */ |
| 58 | /* 314M-25/625-50 */ |
| 59 | /* 314M-50/525-60 */ |
| 60 | /* 314M-50/625-50 */ |
| 61 | /* 370M/1080-60i */ |
| 62 | /* 370M/1080-50i */ |
| 63 | /* 370M/720-60p */ |
| 64 | /* 370M/720-50p */ |
| 65 | /* 306M/525-60 (for backward compatibility) */ |
| 66 | /* 306M/625-50 (for backward compatibility) */ |
| 67 | } |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | static av_cold int dv_parse_sdp_line(AVFormatContext *ctx, int st_index, |
| 73 | PayloadContext *dv_data, const char *line) |
| 74 | { |
| 75 | AVStream *current_stream; |
| 76 | const char *sdp_line_ptr = line; |
| 77 | |
| 78 | if (st_index < 0) |
| 79 | return 0; |
| 80 | |
| 81 | current_stream = ctx->streams[st_index]; |
| 82 | |
| 83 | if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) { |
| 84 | return ff_parse_fmtp(ctx, current_stream, dv_data, sdp_line_ptr, |
| 85 | dv_sdp_parse_fmtp_config); |
| 86 | } |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | static int dv_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_dv_ctx, |
| 92 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, |
| 93 | const uint8_t *buf, int len, uint16_t seq, |
| 94 | int flags) |
| 95 | { |
| 96 | int res = 0; |
| 97 | |
| 98 | /* drop data of previous packets in case of non-continuous (lossy) packet stream */ |
| 99 | if (rtp_dv_ctx->buf && rtp_dv_ctx->timestamp != *timestamp) { |
| 100 | ffio_free_dyn_buf(&rtp_dv_ctx->buf); |
| 101 | } |
| 102 | |
| 103 | /* sanity check for size of input packet: 1 byte payload at least */ |
| 104 | if (len < 1) { |
| 105 | av_log(ctx, AV_LOG_ERROR, "Too short RTP/DV packet, got %d bytes\n", len); |
| 106 | return AVERROR_INVALIDDATA; |
| 107 | } |
| 108 | |
| 109 | /* start frame buffering with new dynamic buffer */ |
| 110 | if (!rtp_dv_ctx->buf) { |
| 111 | res = avio_open_dyn_buf(&rtp_dv_ctx->buf); |
| 112 | if (res < 0) |
| 113 | return res; |
| 114 | /* update the timestamp in the frame packet with the one from the RTP packet */ |
| 115 | rtp_dv_ctx->timestamp = *timestamp; |
| 116 | } |
| 117 | |
| 118 | /* write the fragment to the dyn. buffer */ |
| 119 | avio_write(rtp_dv_ctx->buf, buf, len); |
| 120 | |
| 121 | /* RTP marker bit means: last fragment of current frame was received; |
| 122 | otherwise, an additional fragment is needed for the current frame */ |
| 123 | if (!(flags & RTP_FLAG_MARKER)) |
| 124 | return AVERROR(EAGAIN); |
| 125 | |
| 126 | /* close frame buffering and create resulting A/V packet */ |
| 127 | res = ff_rtp_finalize_packet(pkt, &rtp_dv_ctx->buf, st->index); |
| 128 | if (res < 0) |
| 129 | return res; |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | RTPDynamicProtocolHandler ff_dv_dynamic_handler = { |
| 135 | .enc_name = "DV", |
| 136 | .codec_type = AVMEDIA_TYPE_VIDEO, |
| 137 | .codec_id = AV_CODEC_ID_DVVIDEO, |
| 138 | .need_parsing = AVSTREAM_PARSE_FULL, |
| 139 | .parse_sdp_a_line = dv_parse_sdp_line, |
| 140 | .priv_data_size = sizeof(PayloadContext), |
| 141 | .close = dv_close_context, |
| 142 | .parse_packet = dv_handle_packet, |
| 143 | }; |
| 144 |