#include "rm.h"
#include "internal.h"
-typedef struct rdt_data {
+struct RDTDemuxContext {
+ AVFormatContext *ic;
+ AVStream *st;
+ void *dynamic_protocol_context;
+ DynamicPayloadPacketHandlerProc parse_packet;
+ uint32_t prev_set_id, prev_timestamp;
+};
+
+RDTDemuxContext *
+ff_rdt_parse_open(AVFormatContext *ic, AVStream *st,
+ void *priv_data, RTPDynamicProtocolHandler *handler)
+{
+ RDTDemuxContext *s = av_mallocz(sizeof(RDTDemuxContext));
+ if (!s)
+ return NULL;
+
+ s->ic = ic;
+ s->st = st;
+ s->prev_set_id = -1;
+ s->prev_timestamp = -1;
+ s->parse_packet = handler->parse_packet;
+ s->dynamic_protocol_context = priv_data;
+
+ return s;
+}
+
+void
+ff_rdt_parse_close(RDTDemuxContext *s)
+{
+ av_free(s);
+}
+
+struct PayloadContext {
AVFormatContext *rmctx;
uint8_t *mlti_data;
unsigned int mlti_data_size;
- uint32_t prev_sn, prev_ts;
char buffer[RTP_MAX_PACKET_LENGTH + FF_INPUT_BUFFER_PADDING_SIZE];
-} rdt_data;
+};
void
ff_rdt_calc_response_and_checksum(char response[41], char chksum[9],
}
static int
-rdt_load_mdpr (rdt_data *rdt, AVStream *st, int rule_nr)
+rdt_load_mdpr (PayloadContext *rdt, AVStream *st, int rule_nr)
{
- ByteIOContext *pb;
+ ByteIOContext pb;
int size;
uint32_t tag;
*/
if (!rdt->mlti_data)
return -1;
- url_open_buf(&pb, rdt->mlti_data, rdt->mlti_data_size, URL_RDONLY);
- tag = get_le32(pb);
+ init_put_byte(&pb, rdt->mlti_data, rdt->mlti_data_size, 0,
+ NULL, NULL, NULL, NULL);
+ tag = get_le32(&pb);
if (tag == MKTAG('M', 'L', 'T', 'I')) {
int num, chunk_nr;
/* read index of MDPR chunk numbers */
- num = get_be16(pb);
+ num = get_be16(&pb);
if (rule_nr < 0 || rule_nr >= num)
return -1;
- url_fskip(pb, rule_nr * 2);
- chunk_nr = get_be16(pb);
- url_fskip(pb, (num - 1 - rule_nr) * 2);
+ url_fskip(&pb, rule_nr * 2);
+ chunk_nr = get_be16(&pb);
+ url_fskip(&pb, (num - 1 - rule_nr) * 2);
/* read MDPR chunks */
- num = get_be16(pb);
+ num = get_be16(&pb);
if (chunk_nr >= num)
return -1;
while (chunk_nr--)
- url_fskip(pb, get_be32(pb));
- size = get_be32(pb);
+ url_fskip(&pb, get_be32(&pb));
+ size = get_be32(&pb);
} else {
size = rdt->mlti_data_size;
- url_fseek(pb, 0, SEEK_SET);
+ url_fseek(&pb, 0, SEEK_SET);
}
- rdt->rmctx->pb = pb;
- if (ff_rm_read_mdpr_codecdata(rdt->rmctx, st, size) < 0)
+ if (ff_rm_read_mdpr_codecdata(rdt->rmctx, &pb, st, size) < 0)
return -1;
- url_close_buf(pb);
return 0;
}
int
ff_rdt_parse_header(const uint8_t *buf, int len,
- int *sn, int *seq, int *rn, uint32_t *ts)
+ int *pset_id, int *pseq_no, int *pstream_id,
+ int *pis_keyframe, uint32_t *ptimestamp)
{
int consumed = 10;
- if (len > 0 && (buf[0] < 0x40 || buf[0] > 0x42)) {
- buf += 9;
- len -= 9;
- consumed += 9;
+ /* skip status packets */
+ while (len >= 5 && buf[1] == 0xFF /* status packet */) {
+ int pkt_len;
+
+ if (!(buf[0] & 0x80))
+ return -1; /* not followed by a data packet */
+
+ pkt_len = AV_RB16(buf+3);
+ buf += pkt_len;
+ len -= pkt_len;
+ consumed += pkt_len;
}
if (len < 10)
return -1;
- if (sn) *sn = (buf[0]>>1) & 0x1f;
- if (seq) *seq = AV_RB16(buf+1);
- if (ts) *ts = AV_RB32(buf+4);
- if (rn) *rn = buf[3] & 0x3f;
+ /**
+ * Layout of the header (in bits):
+ * 1: len_included
+ * Flag indicating whether this header includes a length field;
+ * this can be used to concatenate multiple RDT packets in a
+ * single UDP/TCP data frame and is used to precede RDT data
+ * by stream status packets
+ * 1: need_reliable
+ * Flag indicating whether this header includes a "reliable
+ * sequence number"; these are apparently sequence numbers of
+ * data packets alone. For data packets, this flag is always
+ * set, according to the Real documentation [1]
+ * 5: set_id
+ * ID of a set of streams of identical content, possibly with
+ * different codecs or bitrates
+ * 1: is_reliable
+ * Flag set for certain streams deemed less tolerable for packet
+ * loss
+ * 16: seq_no
+ * Packet sequence number; if >=0xFF00, this is a non-data packet
+ * containing stream status info, the second byte indicates the
+ * type of status packet (see wireshark docs / source code [2])
+ * if (len_included) {
+ * 16: packet_len
+ * } else {
+ * packet_len = remainder of UDP/TCP frame
+ * }
+ * 1: is_back_to_back
+ * Back-to-Back flag; used for timing, set for one in every 10
+ * packets, according to the Real documentation [1]
+ * 1: is_slow_data
+ * Slow-data flag; currently unused, according to Real docs [1]
+ * 5: stream_id
+ * ID of the stream within this particular set of streams
+ * 1: is_no_keyframe
+ * Non-keyframe flag (unset if packet belongs to a keyframe)
+ * 32: timestamp (PTS)
+ * if (set_id == 0x1F) {
+ * 16: set_id (extended set-of-streams ID; see set_id)
+ * }
+ * if (need_reliable) {
+ * 16: reliable_seq_no
+ * Reliable sequence number (see need_reliable)
+ * }
+ * if (stream_id == 0x3F) {
+ * 16: stream_id (extended stream ID; see stream_id)
+ * }
+ * [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt
+ * [2] http://www.wireshark.org/docs/dfref/r/rdt.html and
+ * http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c
+ */
+ if (pset_id) *pset_id = (buf[0]>>1) & 0x1f;
+ if (pseq_no) *pseq_no = AV_RB16(buf+1);
+ if (ptimestamp) *ptimestamp = AV_RB32(buf+4);
+ if (pstream_id) *pstream_id = (buf[3]>>1) & 0x1f;
+ if (pis_keyframe) *pis_keyframe = !(buf[3] & 0x1);
return consumed;
}
/**< return 0 on packet, no more left, 1 on packet, 1 on partial packet... */
static int
-rdt_parse_packet (RTPDemuxContext *s, AVPacket *pkt, uint32_t *timestamp,
+rdt_parse_packet (PayloadContext *rdt, AVStream *st,
+ AVPacket *pkt, uint32_t *timestamp,
const uint8_t *buf, int len, int flags)
{
- rdt_data *rdt = s->dynamic_protocol_context;
int seq = 1, res;
- ByteIOContext *pb = rdt->rmctx->pb;
+ ByteIOContext pb;
RMContext *rm = rdt->rmctx->priv_data;
- AVStream *st = s->st;
if (rm->audio_pkt_cnt == 0) {
int pos;
- url_open_buf (&pb, buf, len, URL_RDONLY);
+ init_put_byte(&pb, buf, len, 0, NULL, NULL, NULL, NULL);
flags = (flags & PKT_FLAG_KEY) ? 2 : 0;
- rdt->rmctx->pb = pb;
- res = ff_rm_parse_packet (rdt->rmctx, st, len, pkt,
+ res = ff_rm_parse_packet (rdt->rmctx, &pb, st, len, pkt,
&seq, &flags, timestamp);
- pos = url_ftell(pb);
- url_close_buf (pb);
+ pos = url_ftell(&pb);
if (res < 0)
return res;
if (rm->audio_pkt_cnt > 0 &&
st->codec->codec_id == CODEC_ID_AAC) {
memcpy (rdt->buffer, buf + pos, len - pos);
- url_open_buf (&pb, rdt->buffer, len - pos, URL_RDONLY);
- rdt->rmctx->pb = pb;
+ rdt->rmctx->pb = av_alloc_put_byte (rdt->buffer, len - pos, 0,
+ NULL, NULL, NULL, NULL);
}
} else {
- ff_rm_retrieve_cache (rdt->rmctx, st, pkt);
+ ff_rm_retrieve_cache (rdt->rmctx, rdt->rmctx->pb, st, pkt);
if (rm->audio_pkt_cnt == 0 &&
st->codec->codec_id == CODEC_ID_AAC)
- url_close_buf (pb);
+ av_freep(&rdt->rmctx->pb);
}
pkt->stream_index = st->index;
pkt->pts = *timestamp;
}
int
-ff_rdt_parse_packet(RTPDemuxContext *s, AVPacket *pkt,
+ff_rdt_parse_packet(RDTDemuxContext *s, AVPacket *pkt,
const uint8_t *buf, int len)
{
- rdt_data *rdt = s->dynamic_protocol_context;
- int seq, flags = 0, rule, sn;
+ int seq_no, flags = 0, stream_id, set_id, is_keyframe;
uint32_t timestamp;
int rv= 0;
+ if (!s->parse_packet)
+ return -1;
+
if (!buf) {
/* return the next packets, if any */
timestamp= 0; ///< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned....
- rv= rdt_parse_packet(s, pkt, ×tamp, NULL, 0, flags);
+ rv= s->parse_packet(s->dynamic_protocol_context,
+ s->st, pkt, ×tamp, NULL, 0, flags);
return rv;
}
if (len < 12)
return -1;
- rv = ff_rdt_parse_header(buf, len, &sn, &seq, &rule, ×tamp);
+ rv = ff_rdt_parse_header(buf, len, &set_id, &seq_no, &stream_id, &is_keyframe, ×tamp);
if (rv < 0)
return rv;
- if (!(rule & 1) && (sn != rdt->prev_sn || timestamp != rdt->prev_ts)) {
+ if (is_keyframe && (set_id != s->prev_set_id || timestamp != s->prev_timestamp)) {
flags |= PKT_FLAG_KEY;
- rdt->prev_sn = sn;
- rdt->prev_ts = timestamp;
+ s->prev_set_id = set_id;
+ s->prev_timestamp = timestamp;
}
buf += rv;
len -= rv;
- s->seq = seq;
- rv = rdt_parse_packet(s, pkt, ×tamp, buf, len, flags);
+ rv = s->parse_packet(s->dynamic_protocol_context,
+ s->st, pkt, ×tamp, buf, len, flags);
return rv;
}
}
void
-ff_rdt_subscribe_rule2 (RTPDemuxContext *s, char *cmd, int size,
+ff_rdt_subscribe_rule2 (RDTDemuxContext *s, char *cmd, int size,
int stream_nr, int rule_nr)
{
- rdt_data *rdt = s->dynamic_protocol_context;
+ PayloadContext *rdt = s->dynamic_protocol_context;
rdt_load_mdpr(rdt, s->st, rule_nr * 2);
}
}
static int
-rdt_parse_sdp_line (AVStream *stream, void *d, const char *line)
+rdt_parse_sdp_line (AVStream *stream, PayloadContext *rdt, const char *line)
{
- rdt_data *rdt = d;
const char *p = line;
if (av_strstart(p, "OpaqueData:buffer;", &p)) {
return 0;
}
-static void *
+static PayloadContext *
rdt_new_extradata (void)
{
- rdt_data *rdt = av_mallocz(sizeof(rdt_data));
+ PayloadContext *rdt = av_mallocz(sizeof(PayloadContext));
av_open_input_stream(&rdt->rmctx, NULL, "", &rdt_demuxer, NULL);
- rdt->prev_ts = -1;
- rdt->prev_sn = -1;
return rdt;
}
static void
-rdt_free_extradata (void *d)
+rdt_free_extradata (PayloadContext *rdt)
{
- rdt_data *rdt = d;
-
if (rdt->rmctx)
av_close_input_stream(rdt->rmctx);
av_freep(&rdt->mlti_data);
CODEC_ID_NONE, \
rdt_parse_sdp_line, \
rdt_new_extradata, \
- rdt_free_extradata \
+ rdt_free_extradata, \
+ rdt_parse_packet \
};
RDT_HANDLER(live_video, "x-pn-multirate-realvideo-live", CODEC_TYPE_VIDEO);
projects / ffmpeg / blobdiff