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rtmp.c
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rtmp.c
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/* system includes */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <netinet/in.h>
#include <assert.h>
/* these are primarily for get_uptime */
#include <stdint.h>
#include <sys/times.h>
#include <unistd.h>
/* local includes */
#include "rtmp.h"
#include "amf.h"
#include "mediaserver.h"
static uint32_t clk_tck;
static uint32_t get_uptime()
{
struct tms t;
if (!clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
return times(&t) * 1000 / clk_tck;
}
static int send_chunksize(rtmp *r, int chunksize, int ts)
{
uint8_t pbuf[4];
uint8_t *body = pbuf, *end = pbuf + sizeof(pbuf);
rtmp_packet packet = {
.chunk_id = 0x02,
.msg_id = 0,
.msg_type = 0x01,
.timestamp = ts,
.size = end - body,
.body = body
};
amf_write_i32(body, end, chunksize);
r->out_chunk_size = chunksize;
fprintf(stdout, "Setting outbound chunk size to %d bytes\n", chunksize);
return rtmp_send(r, &packet);
}
static int send_ack(rtmp *r, int ts)
{
uint8_t pbuf[4];
uint8_t *body = pbuf, *end = pbuf + sizeof(pbuf);
rtmp_packet packet = {
.chunk_id = 0x02,
.msg_id = 0,
.msg_type = 0x03,
.timestamp = ts,
.size = end - body,
.body = body
};
amf_write_i32(body, end, r->rx);
fprintf(stdout, "Sending ack for %d bytes\n", r->rx);
return rtmp_send(r, &packet);
}
static int send_usercontrol(rtmp *r, int msg, int data, int ts)
{
uint8_t pbuf[6];
uint8_t *body = pbuf, *end = pbuf + sizeof(pbuf);
rtmp_packet packet = {
.chunk_id = 0x02,
.msg_id = 0,
.msg_type = 0x04,
.timestamp = ts,
.size = end - body,
.body = body
};
amf_write_i16(body, end, msg);
body += 2;
amf_write_i32(body, end, data);
return rtmp_send(r, &packet);
}
enum {
STREAM_BEGIN = 0,
STREAM_EOF,
STREAM_DRY,
SET_BUF_LEN,
STREAM_RECORDED,
PING = 6,
PONG
}; // control types
static inline int send_stream_begin(rtmp *r, int stream_id, int ts)
{
return send_usercontrol(r, STREAM_BEGIN, stream_id, ts);
}
static inline int send_stream_recorded(rtmp *r, int stream_id, int ts)
{
return send_usercontrol(r, STREAM_RECORDED, stream_id, ts);
}
static inline int send_ping(rtmp *r, int ts)
{
// XXX get_uptime() should actually be the server time??
return send_usercontrol(r, PING, get_uptime(), ts);
}
static inline int send_pong(rtmp *r, uint32_t ping_t, int ts)
{
return send_usercontrol(r, PONG, ping_t, ts);
}
static videoapi_unused int send_buflen(rtmp *r, int stream_id, int ts)
{
#define BUFLEN 3000
uint8_t pbuf[10];
uint8_t *body = pbuf, *end = pbuf + sizeof(pbuf);
rtmp_packet packet = {
.chunk_id = 0x02,
.msg_id = 0,
.msg_type = 0x04,
.timestamp = ts,
.size = end - body,
.body = body
};
amf_write_i16(body, end, 0x07);
body += 2;
amf_write_i32(body, end, stream_id);
body += 4;
amf_write_i32(body, end, BUFLEN);
fprintf(stdout, "Sending buflen for stream %d, %d-ms buffer\n",
stream_id, BUFLEN);
return rtmp_send(r, &packet);
#undef BUFLEN
}
static int send_ack_size(rtmp *r, int ts)
{
uint8_t pbuf[4];
rtmp_packet packet = {
.chunk_id = 0x02,
.msg_id = 0,
.msg_type = 0x05,
.timestamp = ts,
.size = sizeof(pbuf),
.body = pbuf
};
amf_write_i32(pbuf, pbuf + sizeof(pbuf), r->ack_size);
fprintf(stdout, "Sending ack window for size %d\n", r->ack_size);
return rtmp_send(r, &packet);
}
static int send_peer_bw(rtmp *rtmp, int ts)
{
uint8_t pbuf[5];
amf_write_i32(pbuf, pbuf + 4, 0x0fffffff);
pbuf[4] = 2; // uhhh wtf? XXX review spec
rtmp_packet packet = {
.chunk_id = 0x02,
.msg_id = 0,
.msg_type = 0x06,
.timestamp = 0,
.size = sizeof(pbuf),
.body = pbuf
};
fprintf(stdout, "sending clientbw, rx: %d, tx %d\n", rtmp->rx, rtmp->tx);
return rtmp_send(rtmp, &packet);
}
static int read_bytes(rtmp *r, uint8_t *p, int howmany)
{
int len;
len = recv(r->fd, p, howmany, 0);
if (!len) {
// If no messages are available to be received and the peer
// has performed an orderly shutdown, recv() shall return 0.
errno = EIO;
}
if (len > 0)
r->rx += len;
// send return report if rx exceeds ack window
if (r->rx >= r->prev_ack + r->ack_size) {
send_ack(r, 0); // TODO fix timestamp
r->prev_ack = r->rx;
}
return len ;
}
#include "handshake.c"
#include "process_messages.c"
static int handle_control(rtmp *r, rtmp_packet *pkt)
{
int ctrl_type;
uint8_t *body = pkt->body;
if (pkt->size < 6) // includes 4-byte that is common to all types
goto control_error;
ctrl_type = amf_read_i16(body);
body += 2;
switch (ctrl_type) {
case STREAM_BEGIN:
case STREAM_EOF:
case STREAM_DRY:
case STREAM_RECORDED:
case PONG:
fprintf(stdout, "control %d, value %d\n",
ctrl_type, amf_read_i32(body));
body += 4;
break;
case PING:
send_pong(r, amf_read_i32(body), pkt->timestamp + 1);
body += 4;
break;
case SET_BUF_LEN:
// XXX use this to set the tx rate?
if (pkt->size < 8)
goto control_error;
fprintf(stdout, "setting buffer length: stream %d, %d-ms buffer\n",
amf_read_i32(body), amf_read_i32(body + 4));
body += 8;
break;
default:
fprintf(stderr, "Unknown control type.\n");
goto control_error;
}
return 0;
control_error:
fprintf(stderr, "Not enough bytes in control packet, exiting.\n");
return -1;
}
static int handle_setpeerbw(rtmp *r, rtmp_packet *pkt)
{
int ack;
if (pkt->size < 4) goto peerbw_fail;
ack = amf_read_i32(pkt->body);
if (ack != r->ack_size) {
r->ack_size = ack;
return send_ack_size(r, pkt->timestamp + 1);
}
return 0;
peerbw_fail:
fprintf(stderr, "Not enough bytes when reading peer bw packet.\n");
return -1;
}
static void parse_metadata(rtmp *r, rtmp_stream *stream)
{
// only extract the things we care about
AMFObject metadata, metaobjs;
// skip over \0x2\0x00\0xaonMetaData
int len = AMF_Decode(&metadata, (char*)stream->metadata + 13,
stream->metadata_size - 13, FALSE);
if (len < 0) {
fprintf(stderr, "Error decoding metadata!\n");
return;
}
// slight problem: zero will be returned if the key is not found,
// but zero is a valid audio codec ID (linear PCM).
// let's hope we don't have any LPCM-specific stuff
// TODO check bounds, especially validity of metaobjs
AMFProp_GetObject(AMF_GetProp(&metadata, NULL, 0), &metaobjs); //ugh
stream->vcodec = (int)amf_read_dbl_kv(&metaobjs, "videocodecid");
stream->acodec = (int)amf_read_dbl_kv(&metaobjs, "audiocodecid");
AMF_Reset(&metadata);
}
static void handle_notify(rtmp *r, rtmp_packet *pkt)
{
// XXX hack for leading whitespace in 0x0f messages
uint8_t *body = pkt->body;
int size = pkt->size, offset = 0;
while (!*body) { body++; size--; offset++; }
if (!memcmp("\x02\x00\x0d@setDataFrame\x02\x00\x0aonMetaData",
(char*)body, 29)) {
rtmp_stream *s = r->streams[pkt->msg_id];
size -= 16; // skip @setDataFrame only
s->metadata = malloc(size + 1);
if (!s->metadata) {
fprintf(stderr, "Out of memory for metadata!\n");
return;
}
memcpy(s->metadata, body + 16, size);
s->metadata[size] = '\0';
s->metadata_size = size;
parse_metadata(r, s);
} else
fprintf(stdout, "Unhandled metadata!\n");
}
static void handle_audio(rtmp *r, rtmp_packet *pkt)
{
// intercept the AAC sequence header and cache it
if (10 == (pkt->body[0] >> 4) && !pkt->body[1]) {
uint8_t *cache = malloc(pkt->size);
if (!cache) {
fprintf(stderr, "Out of memory for AAC cache!\n");
return;
}
memcpy(cache, pkt->body, pkt->size);
if (r->streams[pkt->msg_id]->aac_seq) {
// AFAIK this should not really happen as the AAC sequence
// is only really stored at the beginning of the stream
fprintf(stdout, "Warning: removing previous AAC sequence.\n");
free(r->streams[pkt->msg_id]->aac_seq);
}
r->streams[pkt->msg_id]->aac_seq = cache;
r->streams[pkt->msg_id]->aac_seq_size = pkt->size;
fprintf(stdout, "AAC extradata cached %d.\n", pkt->size);
}
}
static void handle_video(rtmp *r, rtmp_packet *pkt)
{
// intercept the AVC sequence header and cache it
if (7 == (pkt->body[0] & 0x0f) && !pkt->body[1]) {
uint8_t *cache = malloc(pkt->size);
if (!cache) {
fprintf(stderr, "Out of memory for AVC cache!\n");
return;
}
memcpy(cache, pkt->body, pkt->size);
if (r->streams[pkt->msg_id]->avc_seq) {
// AVC sequence is only really stored at stream start
fprintf(stderr, "Warning: removing previous AVC sequence.\n");
free(r->streams[pkt->msg_id]->avc_seq);
}
r->streams[pkt->msg_id]->avc_seq = cache;
r->streams[pkt->msg_id]->avc_seq_size = pkt->size;
fprintf(stdout, "AVC extradata cached %d.\n", pkt->size);
}
if (5 == (pkt->body[0] & 0x0f)) {
fprintf(stderr, "Got video info/command frame; what to do??\n");
}
}
static int handle_msg(rtmp *r, struct rtmp_packet *pkt)
{
switch (pkt->msg_type) {
case 0x01: // set chunk size
r->in_chunk_size = amf_read_i32(pkt->body);
break;
case 0x02: // abort message
break;
case 0x03:
fprintf(stdout, "Ack: %d Bytes Read\n", amf_read_i32(pkt->body));
break;
case 0x04:
handle_control(r, pkt);
break;
case 0x05:
fprintf(stdout, "Set Ack Size: %d\n", amf_read_i32(pkt->body));
break;
case 0x06: // set window ack size.
handle_setpeerbw(r, pkt);
break;
case 0x07: // for edge-origin distribution
break;
case 0x08: // audio
handle_audio(r, pkt);
break;
case 0x09: // video
handle_video(r, pkt);
break;
case 0x0f: // flex stream (HACK)
case 0x12:
handle_notify(r, pkt);
break;
case 0x11: // Flex message
case 0x14:
handle_invoke(r, pkt);
break;
default:
fprintf(stdout, "default in cb: 0x%x\n", pkt->msg_type);
}
if (r->read_cb)
r->read_cb(r, pkt);
return 0;
}
static uint32_t read_i32_le(uint8_t *c)
{
return (c[3] << 24) | (c[2] << 16) | (c[1] << 8) | c[0];
}
static int process_packet(rtmp *r)
{
int header_type, chunk_id, chunk_size, to_increment = 0, copy_header = 0;
rtmp_packet *pkt = r->prev_pkt;
uint8_t *p, *pe;
p = r->hdr;
// if a prev packet already exists, no need to read in header again
if (!r->prev_pkt) {
// overread the header a little to avoid having to call recv
// for each byte as we need it.
// later, copy leftover/unused data in the header buffer to body
if ((r->hdr_bytes += read_bytes(r, p + r->hdr_bytes, sizeof(r->hdr) - r->hdr_bytes)) <= 0) {
fprintf(stdout, "ZOMGBROKEN\n");
return RTMPERR(errno);
}
pe = p + r->hdr_bytes;
if ((pe - p) < 1)
goto parse_pkt_fail;
header_type = (*p & 0xc0) >> 6;
chunk_id = *p & 0x3f;
p += 1;
if ((chunk_id > 319 && (pe - p) < 2) ||
(chunk_id > 64 && (pe - p) < 1)) {
goto parse_pkt_fail;
}
if (!chunk_id) {
chunk_id = *p + 64;
p += 1;
} else if (1 == chunk_id ) {
chunk_id = (*p << 8) + p[1] + 64;
p += 2;
}
// get previous packet in chunk
if (r->in_channels[chunk_id]) {
pkt = r->in_channels[chunk_id];
} else {
if(!(pkt = malloc(sizeof(rtmp_packet)))) {
fprintf(stderr, "Failed to malloc space for packet!\n");
return RTMPERR(ENOMEM);
}
memset(pkt, 0, sizeof(rtmp_packet)); // zero out
pkt->chunk_id = chunk_id;
r->in_channels[chunk_id] = pkt;
}
pkt->chunk_type = header_type;
// NB: we intentionally fallthrough here
switch (header_type) {
case CHUNK_LARGE:
if ((pe - p) < CHUNK_SIZE_LARGE) goto parse_pkt_fail;
pkt->msg_id = read_i32_le(&p[7]);
to_increment += 4;
case CHUNK_MEDIUM:
if ((pe - p) < CHUNK_SIZE_MEDIUM ) goto parse_pkt_fail;
pkt->msg_type = p[6];
pkt->size = amf_read_i24(&p[3]); // size exclusive of header
pkt->read = 0;
to_increment += 4;
case CHUNK_SMALL: {
uint32_t ts;
if ((pe - p) < CHUNK_SIZE_SMALL) goto parse_pkt_fail; // XXX error out
ts = amf_read_i24(p);
to_increment += 3;
if (0xffffff == ts) {
// read in extended timestamp
static const int header_sizes[] = { CHUNK_SIZE_LARGE,
CHUNK_SIZE_MEDIUM,
CHUNK_SIZE_SMALL };
int hsize = header_sizes[header_type];
if (p + hsize + 4 > pe) goto parse_pkt_fail;
ts = amf_read_i32(p+hsize);
to_increment += 4;
}
if (!header_type) {
pkt->timestamp = ts; // abs timestamp
pkt->ts_delta = 0;
} else {
pkt->timestamp += ts; // timestamp delta
pkt->ts_delta = ts;
}
}
case 3:
break;
}
p += to_increment;
// enlarge packet body if needed
if (!pkt->read && pkt->alloc_size < pkt->size) {
// allocate packet body
if (pkt->body) {
free(pkt->body);
pkt->body = NULL;
pkt->alloc_size = 0;
}
if (!(pkt->body = malloc(pkt->size))) {
fprintf(stderr, "Out of memory when allocating packet!\n");
return RTMPERR(ENOMEM);
}
pkt->alloc_size = pkt->size;
}
// copy packet data
chunk_size = r->in_chunk_size < (pkt->size - pkt->read) ?
r->in_chunk_size : (pkt->size - pkt->read);
// copy over any data leftover from header buffer
int leftover = r->hdr_bytes - (p - r->hdr);
chunk_size -= leftover;
if (chunk_size < 0) {
// we fucked up and overread into the next packet
leftover += chunk_size;
r->hdr_bytes = -chunk_size;
chunk_size = 0;
copy_header = 1;
}
// candidate for synthetic microbenchmarking against a while loop
memcpy(pkt->body + pkt->read, p, leftover);
p += leftover;
pkt->read += leftover;
} else {
chunk_size = r->chunk_alignment;
r->chunk_alignment = 0;
}
if (chunk_size) {
int len;
if ((len = read_bytes(r, pkt->body + pkt->read, chunk_size)) <= 0) {
if (errno == EAGAIN){
len = 0;
} else {
fprintf(stderr, "Error reading bytes!\n");
return RTMPERR(errno);
}
}
// chunk was split across TCP packets
if (len != chunk_size) {
pkt->read += len;
r->chunk_alignment = chunk_size - len;
r->prev_pkt = pkt;
return RTMPERR(EAGAIN);
}
r->hdr_bytes = 0; // we've completed our chunk
} else if (copy_header) {
// we copied way too much in the header and spilled over
// into the next packet; save the leftover leftover bytes
// into a temp buffer
// XXX probably should verify size of write_buf!
assert(r->hdr_bytes <= sizeof(r->hdr));
memmove(r->hdr, p, r->hdr_bytes);
} else {
// this condition is triggered when we have:
// a) chunk body (or remainder thereof) that fits into header buf
// b) no overflow that spills over to the next chunk
// (in short, the chunk terminates on a TCP packet boundary)
r->hdr_bytes = 0;
}
r->prev_pkt = NULL;
pkt->read += chunk_size;
/*
fprintf(stdout, "Packet/Chunk parameters:\n"
"%15s %d\n%15s %d\n%15s %u\n"
"%15s %d\n%15s %d\n%15s 0x%x\n"
"%15s %d\n%15s %d\n",
"header type", header_type,
"chunk id", chunk_id,
"timestamp", pkt->timestamp,
"body size", pkt->size,
"read", pkt->read,
"msg type", pkt->msg_type,
"msg id", pkt->msg_id,
"chunksize", chunk_size);
*/
if (pkt->read == pkt->size) {
handle_msg(r, pkt);
pkt->read = 0;
}
return 1;
parse_pkt_fail:
return RTMPERR(EAGAIN);
}
void rtmp_read(rtmp *r)
{
int bytes_read;
switch (r->state) {
case UNINIT:
bytes_read = init_handshake(r);
if (1 == bytes_read) r->state = HANDSHAKE;
break;
case HANDSHAKE:
bytes_read = handshake2(r);
if (1 == bytes_read) r->state = READ;
break;
case READ:
bytes_read = process_packet(r);
break;
}
if (bytes_read <= 0 && bytes_read != RTMPERR(EAGAIN)) goto read_error;
return;
read_error:
if (bytes_read == RTMPERR(INVALIDDATA))
fprintf(stderr, "Invalid data\n");
fprintf(stderr, "Error %d, disconnecting fd %d \n", bytes_read, r->fd);
if (r->close_cb)
r->close_cb(r);
}