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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * RTP parser for DV payload format (RFC 6469) |
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| 3 | * Copyright (c) 2015 Thomas Volkert |
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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 | #include "libavutil/avstring.h" |
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| 23 | |||
| 24 | #include "libavcodec/bytestream.h" |
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| 25 | |||
| 26 | #include "avio_internal.h" |
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| 27 | #include "rtpdec_formats.h" |
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| 28 | |||
| 29 | struct PayloadContext { |
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| 30 | AVIOContext *buf; |
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| 31 | uint32_t timestamp; |
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| 32 | int bundled_audio; |
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| 33 | }; |
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| 34 | |||
| 35 | static av_cold void dv_close_context(PayloadContext *data) |
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| 36 | { |
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| 37 | ffio_free_dyn_buf(&data->buf); |
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| 38 | } |
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| 39 | |||
| 40 | static av_cold int dv_sdp_parse_fmtp_config(AVFormatContext *s, |
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| 41 | AVStream *stream, |
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| 42 | PayloadContext *dv_data, |
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| 43 | const char *attr, const char *value) |
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| 44 | { |
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| 45 | /* does the DV stream include audio? */ |
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| 46 | if (!strcmp(attr, "audio") && !strcmp(value, "bundled")) |
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| 47 | dv_data->bundled_audio = 1; |
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| 48 | |||
| 49 | /* extract the DV profile */ |
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| 50 | if (!strcmp(attr, "encode")) { |
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| 51 | /* SD-VCR/525-60 */ |
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| 52 | /* SD-VCR/625-50 */ |
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| 53 | /* HD-VCR/1125-60 */ |
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| 54 | /* HD-VCR/1250-50 */ |
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| 55 | /* SDL-VCR/525-60 */ |
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| 56 | /* SDL-VCR/625-50 */ |
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| 57 | /* 314M-25/525-60 */ |
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| 58 | /* 314M-25/625-50 */ |
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| 59 | /* 314M-50/525-60 */ |
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| 60 | /* 314M-50/625-50 */ |
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| 61 | /* 370M/1080-60i */ |
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| 62 | /* 370M/1080-50i */ |
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| 63 | /* 370M/720-60p */ |
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| 64 | /* 370M/720-50p */ |
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| 65 | /* 306M/525-60 (for backward compatibility) */ |
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| 66 | /* 306M/625-50 (for backward compatibility) */ |
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| 67 | } |
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| 68 | |||
| 69 | return 0; |
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| 70 | } |
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| 71 | |||
| 72 | static av_cold int dv_parse_sdp_line(AVFormatContext *ctx, int st_index, |
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| 73 | PayloadContext *dv_data, const char *line) |
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| 74 | { |
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| 75 | AVStream *current_stream; |
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| 76 | const char *sdp_line_ptr = line; |
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| 77 | |||
| 78 | if (st_index < 0) |
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| 79 | return 0; |
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| 80 | |||
| 81 | current_stream = ctx->streams[st_index]; |
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| 82 | |||
| 83 | if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) { |
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| 84 | return ff_parse_fmtp(ctx, current_stream, dv_data, sdp_line_ptr, |
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| 85 | dv_sdp_parse_fmtp_config); |
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| 86 | } |
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| 87 | |||
| 88 | return 0; |
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| 89 | } |
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| 90 | |||
| 91 | static int dv_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_dv_ctx, |
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| 92 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, |
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| 93 | const uint8_t *buf, int len, uint16_t seq, |
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| 94 | int flags) |
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| 95 | { |
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| 96 | int res = 0; |
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| 97 | |||
| 98 | /* drop data of previous packets in case of non-continuous (lossy) packet stream */ |
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| 99 | if (rtp_dv_ctx->buf && rtp_dv_ctx->timestamp != *timestamp) { |
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| 100 | ffio_free_dyn_buf(&rtp_dv_ctx->buf); |
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| 101 | } |
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| 102 | |||
| 103 | /* sanity check for size of input packet: 1 byte payload at least */ |
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| 104 | if (len < 1) { |
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| 105 | av_log(ctx, AV_LOG_ERROR, "Too short RTP/DV packet, got %d bytes\n", len); |
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| 106 | return AVERROR_INVALIDDATA; |
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| 107 | } |
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| 108 | |||
| 109 | /* start frame buffering with new dynamic buffer */ |
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| 110 | if (!rtp_dv_ctx->buf) { |
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| 111 | res = avio_open_dyn_buf(&rtp_dv_ctx->buf); |
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| 112 | if (res < 0) |
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| 113 | return res; |
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| 114 | /* update the timestamp in the frame packet with the one from the RTP packet */ |
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| 115 | rtp_dv_ctx->timestamp = *timestamp; |
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| 116 | } |
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| 117 | |||
| 118 | /* write the fragment to the dyn. buffer */ |
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| 119 | avio_write(rtp_dv_ctx->buf, buf, len); |
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| 120 | |||
| 121 | /* RTP marker bit means: last fragment of current frame was received; |
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| 122 | otherwise, an additional fragment is needed for the current frame */ |
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| 123 | if (!(flags & RTP_FLAG_MARKER)) |
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| 124 | return AVERROR(EAGAIN); |
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| 125 | |||
| 126 | /* close frame buffering and create resulting A/V packet */ |
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| 127 | res = ff_rtp_finalize_packet(pkt, &rtp_dv_ctx->buf, st->index); |
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| 128 | if (res < 0) |
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| 129 | return res; |
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| 130 | |||
| 131 | return 0; |
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| 132 | } |
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| 133 | |||
| 134 | RTPDynamicProtocolHandler ff_dv_dynamic_handler = { |
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| 135 | .enc_name = "DV", |
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| 136 | .codec_type = AVMEDIA_TYPE_VIDEO, |
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| 137 | .codec_id = AV_CODEC_ID_DVVIDEO, |
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| 138 | .need_parsing = AVSTREAM_PARSE_FULL, |
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| 139 | .parse_sdp_a_line = dv_parse_sdp_line, |
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| 140 | .priv_data_size = sizeof(PayloadContext), |
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| 141 | .close = dv_close_context, |
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| 142 | .parse_packet = dv_handle_packet, |
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| 143 | }; |