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