mirror of
https://git.ffmpeg.org/ffmpeg.git
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7960e18fdf
selection. See discussion in ML thread "[PATCH] RDT/Realmedia patches #2". Originally committed as revision 15966 to svn://svn.ffmpeg.org/ffmpeg/trunk
462 lines
14 KiB
C
462 lines
14 KiB
C
/*
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* Realmedia RTSP protocol (RDT) support.
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* Copyright (c) 2007 Ronald S. Bultje
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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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/**
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* @file rdt.c
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* @brief Realmedia RTSP protocol (RDT) support
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* @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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*/
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#include "avformat.h"
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#include "libavutil/avstring.h"
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#include "rtp_internal.h"
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#include "rdt.h"
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#include "libavutil/base64.h"
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#include "libavutil/md5.h"
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#include "rm.h"
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#include "internal.h"
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#include <libavcodec/bitstream.h>
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struct RDTDemuxContext {
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AVFormatContext *ic; /**< the containing (RTSP) demux context */
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/** Each RDT stream-set (represented by one RTSPStream) can contain
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* multiple streams (of the same content, but with possibly different
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* codecs/bitrates). Each such stream is represented by one AVStream
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* in the AVFormatContext, and this variable points to the offset in
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* that array such that the first is the first stream of this set. */
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AVStream **streams;
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int n_streams; /**< streams with identifical content in this set */
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void *dynamic_protocol_context;
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DynamicPayloadPacketHandlerProc parse_packet;
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uint32_t prev_timestamp;
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int prev_set_id, prev_stream_id;
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};
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RDTDemuxContext *
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ff_rdt_parse_open(AVFormatContext *ic, int first_stream_of_set_idx,
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void *priv_data, RTPDynamicProtocolHandler *handler)
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{
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RDTDemuxContext *s = av_mallocz(sizeof(RDTDemuxContext));
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if (!s)
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return NULL;
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s->ic = ic;
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s->streams = &ic->streams[first_stream_of_set_idx];
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do {
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s->n_streams++;
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} while (first_stream_of_set_idx + s->n_streams < ic->nb_streams &&
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s->streams[s->n_streams]->priv_data == s->streams[0]->priv_data);
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s->prev_set_id = -1;
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s->prev_stream_id = -1;
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s->prev_timestamp = -1;
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s->parse_packet = handler->parse_packet;
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s->dynamic_protocol_context = priv_data;
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return s;
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}
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void
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ff_rdt_parse_close(RDTDemuxContext *s)
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{
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av_free(s);
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}
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struct PayloadContext {
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AVFormatContext *rmctx;
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uint8_t *mlti_data;
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unsigned int mlti_data_size;
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char buffer[RTP_MAX_PACKET_LENGTH + FF_INPUT_BUFFER_PADDING_SIZE];
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};
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void
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ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
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const char *challenge)
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{
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int ch_len = strlen (challenge), i;
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unsigned char zres[16],
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buf[64] = { 0xa1, 0xe9, 0x14, 0x9d, 0x0e, 0x6b, 0x3b, 0x59 };
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#define XOR_TABLE_SIZE 37
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const unsigned char xor_table[XOR_TABLE_SIZE] = {
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0x05, 0x18, 0x74, 0xd0, 0x0d, 0x09, 0x02, 0x53,
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0xc0, 0x01, 0x05, 0x05, 0x67, 0x03, 0x19, 0x70,
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0x08, 0x27, 0x66, 0x10, 0x10, 0x72, 0x08, 0x09,
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0x63, 0x11, 0x03, 0x71, 0x08, 0x08, 0x70, 0x02,
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0x10, 0x57, 0x05, 0x18, 0x54 };
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/* some (length) checks */
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if (ch_len == 40) /* what a hack... */
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ch_len = 32;
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else if (ch_len > 56)
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ch_len = 56;
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memcpy(buf + 8, challenge, ch_len);
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/* xor challenge bytewise with xor_table */
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for (i = 0; i < XOR_TABLE_SIZE; i++)
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buf[8 + i] ^= xor_table[i];
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av_md5_sum(zres, buf, 64);
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ff_data_to_hex(response, zres, 16);
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for (i=0;i<32;i++) response[i] = tolower(response[i]);
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/* add tail */
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strcpy (response + 32, "01d0a8e3");
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/* calculate checksum */
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for (i = 0; i < 8; i++)
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chksum[i] = response[i * 4];
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chksum[8] = 0;
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}
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static int
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rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr)
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{
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ByteIOContext pb;
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int size;
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uint32_t tag;
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/**
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* Layout of the MLTI chunk:
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* 4:MLTI
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* 2:<number of streams>
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* Then for each stream ([number_of_streams] times):
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* 2:<mdpr index>
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* 2:<number of mdpr chunks>
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* Then for each mdpr chunk ([number_of_mdpr_chunks] times):
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* 4:<size>
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* [size]:<data>
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* we skip MDPR chunks until we reach the one of the stream
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* we're interested in, and forward that ([size]+[data]) to
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* the RM demuxer to parse the stream-specific header data.
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*/
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if (!rdt->mlti_data)
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return -1;
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init_put_byte(&pb, rdt->mlti_data, rdt->mlti_data_size, 0,
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NULL, NULL, NULL, NULL);
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tag = get_le32(&pb);
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if (tag == MKTAG('M', 'L', 'T', 'I')) {
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int num, chunk_nr;
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/* read index of MDPR chunk numbers */
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num = get_be16(&pb);
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if (rule_nr < 0 || rule_nr >= num)
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return -1;
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url_fskip(&pb, rule_nr * 2);
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chunk_nr = get_be16(&pb);
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url_fskip(&pb, (num - 1 - rule_nr) * 2);
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/* read MDPR chunks */
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num = get_be16(&pb);
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if (chunk_nr >= num)
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return -1;
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while (chunk_nr--)
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url_fskip(&pb, get_be32(&pb));
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size = get_be32(&pb);
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} else {
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size = rdt->mlti_data_size;
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url_fseek(&pb, 0, SEEK_SET);
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}
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if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, size) < 0)
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return -1;
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return 0;
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}
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/**
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* Actual data handling.
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*/
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int
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ff_rdt_parse_header(const uint8_t *buf, int len,
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int *pset_id, int *pseq_no, int *pstream_id,
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int *pis_keyframe, uint32_t *ptimestamp)
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{
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GetBitContext gb;
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int consumed = 0, set_id, seq_no, stream_id, is_keyframe,
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len_included, need_reliable;
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uint32_t timestamp;
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/* skip status packets */
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while (len >= 5 && buf[1] == 0xFF /* status packet */) {
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int pkt_len;
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if (!(buf[0] & 0x80))
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return -1; /* not followed by a data packet */
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pkt_len = AV_RB16(buf+3);
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buf += pkt_len;
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len -= pkt_len;
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consumed += pkt_len;
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}
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if (len < 16)
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return -1;
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/**
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* Layout of the header (in bits):
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* 1: len_included
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* Flag indicating whether this header includes a length field;
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* this can be used to concatenate multiple RDT packets in a
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* single UDP/TCP data frame and is used to precede RDT data
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* by stream status packets
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* 1: need_reliable
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* Flag indicating whether this header includes a "reliable
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* sequence number"; these are apparently sequence numbers of
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* data packets alone. For data packets, this flag is always
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* set, according to the Real documentation [1]
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* 5: set_id
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* ID of a set of streams of identical content, possibly with
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* different codecs or bitrates
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* 1: is_reliable
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* Flag set for certain streams deemed less tolerable for packet
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* loss
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* 16: seq_no
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* Packet sequence number; if >=0xFF00, this is a non-data packet
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* containing stream status info, the second byte indicates the
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* type of status packet (see wireshark docs / source code [2])
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* if (len_included) {
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* 16: packet_len
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* } else {
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* packet_len = remainder of UDP/TCP frame
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* }
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* 1: is_back_to_back
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* Back-to-Back flag; used for timing, set for one in every 10
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* packets, according to the Real documentation [1]
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* 1: is_slow_data
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* Slow-data flag; currently unused, according to Real docs [1]
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* 5: stream_id
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* ID of the stream within this particular set of streams
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* 1: is_no_keyframe
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* Non-keyframe flag (unset if packet belongs to a keyframe)
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* 32: timestamp (PTS)
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* if (set_id == 0x1F) {
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* 16: set_id (extended set-of-streams ID; see set_id)
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* }
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* if (need_reliable) {
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* 16: reliable_seq_no
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* Reliable sequence number (see need_reliable)
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* }
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* if (stream_id == 0x3F) {
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* 16: stream_id (extended stream ID; see stream_id)
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* }
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* [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt
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* [2] http://www.wireshark.org/docs/dfref/r/rdt.html and
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* http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c
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*/
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init_get_bits(&gb, buf, len << 3);
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len_included = get_bits1(&gb);
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need_reliable = get_bits1(&gb);
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set_id = get_bits(&gb, 5);
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skip_bits(&gb, 1);
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seq_no = get_bits(&gb, 16);
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if (len_included)
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skip_bits(&gb, 16);
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skip_bits(&gb, 2);
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stream_id = get_bits(&gb, 5);
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is_keyframe = !get_bits1(&gb);
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timestamp = get_bits_long(&gb, 32);
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if (set_id == 0x1f)
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set_id = get_bits(&gb, 16);
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if (need_reliable)
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skip_bits(&gb, 16);
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if (stream_id == 0x1f)
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stream_id = get_bits(&gb, 16);
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if (pset_id) *pset_id = set_id;
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if (pseq_no) *pseq_no = seq_no;
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if (pstream_id) *pstream_id = stream_id;
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if (pis_keyframe) *pis_keyframe = is_keyframe;
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if (ptimestamp) *ptimestamp = timestamp;
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return consumed + (get_bits_count(&gb) >> 3);
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}
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/**< return 0 on packet, no more left, 1 on packet, 1 on partial packet... */
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static int
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rdt_parse_packet (PayloadContext *rdt, AVStream *st,
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AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, int flags)
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{
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int seq = 1, res;
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ByteIOContext pb;
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RMContext *rm = rdt->rmctx->priv_data;
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if (rm->audio_pkt_cnt == 0) {
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int pos;
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init_put_byte(&pb, buf, len, 0, NULL, NULL, NULL, NULL);
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flags = (flags & PKT_FLAG_KEY) ? 2 : 0;
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res = ff_rm_parse_packet (rdt->rmctx, &pb, st, len, pkt,
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&seq, &flags, timestamp);
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pos = url_ftell(&pb);
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if (res < 0)
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return res;
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if (rm->audio_pkt_cnt > 0 &&
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st->codec->codec_id == CODEC_ID_AAC) {
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memcpy (rdt->buffer, buf + pos, len - pos);
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rdt->rmctx->pb = av_alloc_put_byte (rdt->buffer, len - pos, 0,
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NULL, NULL, NULL, NULL);
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}
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} else {
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ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb, st, pkt);
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if (rm->audio_pkt_cnt == 0 &&
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st->codec->codec_id == CODEC_ID_AAC)
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av_freep(&rdt->rmctx->pb);
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}
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pkt->stream_index = st->index;
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pkt->pts = *timestamp;
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return rm->audio_pkt_cnt > 0;
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}
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int
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ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt,
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const uint8_t *buf, int len)
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{
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int seq_no, flags = 0, stream_id, set_id, is_keyframe;
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uint32_t timestamp;
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int rv= 0;
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if (!s->parse_packet)
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return -1;
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if (!buf && s->prev_stream_id != -1) {
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/* return the next packets, if any */
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timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned....
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rv= s->parse_packet(s->dynamic_protocol_context,
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s->streams[s->prev_stream_id],
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pkt, ×tamp, NULL, 0, flags);
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return rv;
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}
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if (len < 12)
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return -1;
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rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, ×tamp);
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if (rv < 0)
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return rv;
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if (is_keyframe &&
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(set_id != s->prev_set_id || timestamp != s->prev_timestamp ||
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stream_id != s->prev_stream_id)) {
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flags |= PKT_FLAG_KEY;
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s->prev_set_id = set_id;
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s->prev_timestamp = timestamp;
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}
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s->prev_stream_id = stream_id;
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buf += rv;
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len -= rv;
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if (s->prev_stream_id >= s->n_streams) {
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s->prev_stream_id = -1;
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return -1;
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}
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rv = s->parse_packet(s->dynamic_protocol_context,
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s->streams[s->prev_stream_id],
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pkt, ×tamp, buf, len, flags);
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return rv;
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}
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void
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ff_rdt_subscribe_rule (char *cmd, int size,
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int stream_nr, int rule_nr)
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{
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av_strlcatf(cmd, size, "stream=%d;rule=%d,stream=%d;rule=%d",
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stream_nr, rule_nr * 2, stream_nr, rule_nr * 2 + 1);
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}
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void
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ff_rdt_subscribe_rule2 (RDTDemuxContext *s, char *cmd, int size,
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int stream_nr, int rule_nr)
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{
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PayloadContext *rdt = s->dynamic_protocol_context;
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rdt_load_mdpr(rdt, s->streams[0], rule_nr * 2);
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}
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static unsigned char *
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rdt_parse_b64buf (unsigned int *target_len, const char *p)
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{
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unsigned char *target;
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int len = strlen(p);
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if (*p == '\"') {
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p++;
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len -= 2; /* skip embracing " at start/end */
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}
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*target_len = len * 3 / 4;
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target = av_mallocz(*target_len + FF_INPUT_BUFFER_PADDING_SIZE);
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av_base64_decode(target, p, *target_len);
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return target;
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}
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static int
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rdt_parse_sdp_line (AVStream *stream, PayloadContext *rdt, const char *line)
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{
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const char *p = line;
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if (av_strstart(p, "OpaqueData:buffer;", &p)) {
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rdt->mlti_data = rdt_parse_b64buf(&rdt->mlti_data_size, p);
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} else if (av_strstart(p, "StartTime:integer;", &p))
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stream->first_dts = atoi(p);
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return 0;
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}
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static PayloadContext *
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rdt_new_extradata (void)
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{
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PayloadContext *rdt = av_mallocz(sizeof(PayloadContext));
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av_open_input_stream(&rdt->rmctx, NULL, "", &rdt_demuxer, NULL);
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return rdt;
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}
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static void
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rdt_free_extradata (PayloadContext *rdt)
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{
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if (rdt->rmctx)
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av_close_input_stream(rdt->rmctx);
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av_freep(&rdt->mlti_data);
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av_free(rdt);
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}
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#define RDT_HANDLER(n, s, t) \
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static RTPDynamicProtocolHandler ff_rdt_ ## n ## _handler = { \
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s, \
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t, \
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CODEC_ID_NONE, \
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rdt_parse_sdp_line, \
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rdt_new_extradata, \
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rdt_free_extradata, \
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rdt_parse_packet \
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};
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RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", CODEC_TYPE_VIDEO);
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RDT_HANDLER(live_audio, "x-pn-multirate-realaudio-live", CODEC_TYPE_AUDIO);
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RDT_HANDLER(video, "x-pn-realvideo", CODEC_TYPE_VIDEO);
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RDT_HANDLER(audio, "x-pn-realaudio", CODEC_TYPE_AUDIO);
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void av_register_rdt_dynamic_payload_handlers(void)
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{
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ff_register_dynamic_payload_handler(&ff_rdt_video_handler);
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ff_register_dynamic_payload_handler(&ff_rdt_audio_handler);
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ff_register_dynamic_payload_handler(&ff_rdt_live_video_handler);
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ff_register_dynamic_payload_handler(&ff_rdt_live_audio_handler);
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}
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