mirror of https://github.com/FFmpeg/FFmpeg.git
(tested with live555 RTSP server) Signed-off-by: Martin Storsjö <martin@martin.st>pull/113/head^2
Thomas Volkert
10 years ago
committed by
Martin Storsjö
parent
44dc138ed2
commit
c99915f7c7
6 changed files with 174 additions and 1 deletions
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/*
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "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 PayloadContext *dv_new_context(void) |
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{ |
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return av_mallocz(sizeof(PayloadContext)); |
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} |
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static void dv_free_dyn_buffer(AVIOContext **dyn_buf) |
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{ |
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uint8_t *ptr_dyn_buffer; |
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avio_close_dyn_buf(*dyn_buf, &ptr_dyn_buffer); |
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av_free(ptr_dyn_buffer); |
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*dyn_buf = NULL; |
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} |
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static av_cold void dv_free_context(PayloadContext *data) |
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{ |
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dv_free_dyn_buffer(&data->buf); |
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av_free(data); |
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} |
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static av_cold int dv_init(AVFormatContext *ctx, int st_index, |
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PayloadContext *data) |
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{ |
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av_dlog(ctx, "dv_init() for stream %d\n", st_index); |
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if (st_index < 0) |
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return 0; |
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ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL; |
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return 0; |
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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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char *attr, 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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dv_free_dyn_buffer(&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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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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.init = dv_init, |
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.parse_sdp_a_line = dv_parse_sdp_line, |
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.alloc = dv_new_context, |
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.free = dv_free_context, |
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.parse_packet = dv_handle_packet |
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}; |
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