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