2 * RTP parser for DV payload format (RFC 6469)
3 * Copyright (c) 2015 Thomas Volkert <thomas@homer-conferencing.com>
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
24 #include "libavcodec/bytestream.h"
26 #include "rtpdec_formats.h"
28 struct PayloadContext {
34 static void dv_free_dyn_buffer(AVIOContext **dyn_buf)
36 uint8_t *ptr_dyn_buffer;
37 avio_close_dyn_buf(*dyn_buf, &ptr_dyn_buffer);
38 av_free(ptr_dyn_buffer);
42 static av_cold void dv_free_context(PayloadContext *data)
44 dv_free_dyn_buffer(&data->buf);
48 static av_cold int dv_sdp_parse_fmtp_config(AVFormatContext *s,
50 PayloadContext *dv_data,
51 char *attr, char *value)
53 /* does the DV stream include audio? */
54 if (!strcmp(attr, "audio") && !strcmp(value, "bundled"))
55 dv_data->bundled_audio = 1;
57 /* extract the DV profile */
58 if (!strcmp(attr, "encode")) {
73 /* 306M/525-60 (for backward compatibility) */
74 /* 306M/625-50 (for backward compatibility) */
80 static av_cold int dv_parse_sdp_line(AVFormatContext *ctx, int st_index,
81 PayloadContext *dv_data, const char *line)
83 AVStream *current_stream;
84 const char *sdp_line_ptr = line;
89 current_stream = ctx->streams[st_index];
91 if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) {
92 return ff_parse_fmtp(ctx, current_stream, dv_data, sdp_line_ptr,
93 dv_sdp_parse_fmtp_config);
99 static int dv_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_dv_ctx,
100 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
101 const uint8_t *buf, int len, uint16_t seq,
106 /* drop data of previous packets in case of non-continuous (lossy) packet stream */
107 if (rtp_dv_ctx->buf && rtp_dv_ctx->timestamp != *timestamp) {
108 dv_free_dyn_buffer(&rtp_dv_ctx->buf);
111 /* sanity check for size of input packet: 1 byte payload at least */
113 av_log(ctx, AV_LOG_ERROR, "Too short RTP/DV packet, got %d bytes\n", len);
114 return AVERROR_INVALIDDATA;
117 /* start frame buffering with new dynamic buffer */
118 if (!rtp_dv_ctx->buf) {
119 res = avio_open_dyn_buf(&rtp_dv_ctx->buf);
122 /* update the timestamp in the frame packet with the one from the RTP packet */
123 rtp_dv_ctx->timestamp = *timestamp;
126 /* write the fragment to the dyn. buffer */
127 avio_write(rtp_dv_ctx->buf, buf, len);
129 /* RTP marker bit means: last fragment of current frame was received;
130 otherwise, an additional fragment is needed for the current frame */
131 if (!(flags & RTP_FLAG_MARKER))
132 return AVERROR(EAGAIN);
134 /* close frame buffering and create resulting A/V packet */
135 res = ff_rtp_finalize_packet(pkt, &rtp_dv_ctx->buf, st->index);
142 RTPDynamicProtocolHandler ff_dv_dynamic_handler = {
144 .codec_type = AVMEDIA_TYPE_VIDEO,
145 .codec_id = AV_CODEC_ID_DVVIDEO,
146 .need_parsing = AVSTREAM_PARSE_FULL,
147 .parse_sdp_a_line = dv_parse_sdp_line,
148 .priv_data_size = sizeof(PayloadContext),
149 .free = dv_free_context,
150 .parse_packet = dv_handle_packet,