/* * RTP parser for DV payload format (RFC 6469) * Copyright (c) 2015 Thomas Volkert <thomas@homer-conferencing.com> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/avstring.h" #include "libavcodec/bytestream.h" #include "avio_internal.h" #include "rtpdec_formats.h" struct PayloadContext { AVIOContext *buf; uint32_t timestamp; int bundled_audio; }; static av_cold void dv_close_context(PayloadContext *data) { ffio_free_dyn_buf(&data->buf); } static av_cold int dv_sdp_parse_fmtp_config(AVFormatContext *s, AVStream *stream, PayloadContext *dv_data, const char *attr, const char *value) { /* does the DV stream include audio? */ if (!strcmp(attr, "audio") && !strcmp(value, "bundled")) dv_data->bundled_audio = 1; /* extract the DV profile */ if (!strcmp(attr, "encode")) { /* SD-VCR/525-60 */ /* SD-VCR/625-50 */ /* HD-VCR/1125-60 */ /* HD-VCR/1250-50 */ /* SDL-VCR/525-60 */ /* SDL-VCR/625-50 */ /* 314M-25/525-60 */ /* 314M-25/625-50 */ /* 314M-50/525-60 */ /* 314M-50/625-50 */ /* 370M/1080-60i */ /* 370M/1080-50i */ /* 370M/720-60p */ /* 370M/720-50p */ /* 306M/525-60 (for backward compatibility) */ /* 306M/625-50 (for backward compatibility) */ } return 0; } static av_cold int dv_parse_sdp_line(AVFormatContext *ctx, int st_index, PayloadContext *dv_data, const char *line) { AVStream *current_stream; const char *sdp_line_ptr = line; if (st_index < 0) return 0; current_stream = ctx->streams[st_index]; if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) { return ff_parse_fmtp(ctx, current_stream, dv_data, sdp_line_ptr, dv_sdp_parse_fmtp_config); } return 0; } static int dv_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_dv_ctx, AVStream *st, AVPacket *pkt, uint32_t *timestamp, const uint8_t *buf, int len, uint16_t seq, int flags) { int res = 0; /* drop data of previous packets in case of non-continuous (lossy) packet stream */ if (rtp_dv_ctx->buf && rtp_dv_ctx->timestamp != *timestamp) { ffio_free_dyn_buf(&rtp_dv_ctx->buf); } /* sanity check for size of input packet: 1 byte payload at least */ if (len < 1) { av_log(ctx, AV_LOG_ERROR, "Too short RTP/DV packet, got %d bytes\n", len); return AVERROR_INVALIDDATA; } /* start frame buffering with new dynamic buffer */ if (!rtp_dv_ctx->buf) { res = avio_open_dyn_buf(&rtp_dv_ctx->buf); if (res < 0) return res; /* update the timestamp in the frame packet with the one from the RTP packet */ rtp_dv_ctx->timestamp = *timestamp; } /* write the fragment to the dyn. buffer */ avio_write(rtp_dv_ctx->buf, buf, len); /* RTP marker bit means: last fragment of current frame was received; otherwise, an additional fragment is needed for the current frame */ if (!(flags & RTP_FLAG_MARKER)) return AVERROR(EAGAIN); /* close frame buffering and create resulting A/V packet */ res = ff_rtp_finalize_packet(pkt, &rtp_dv_ctx->buf, st->index); if (res < 0) return res; return 0; } RTPDynamicProtocolHandler ff_dv_dynamic_handler = { .enc_name = "DV", .codec_type = AVMEDIA_TYPE_VIDEO, .codec_id = AV_CODEC_ID_DVVIDEO, .need_parsing = AVSTREAM_PARSE_FULL, .parse_sdp_a_line = dv_parse_sdp_line, .priv_data_size = sizeof(PayloadContext), .close = dv_close_context, .parse_packet = dv_handle_packet, };