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FFmpeg/libavformat/rtmppkt.c
Samuel Pitoiset 7dc747f50b rtmp: Read and handle incoming packets while writing data 
This makes sure all incoming packets are read and handled (and reacted
to) while sending an FLV stream over RTMP to a server. If there were
enough incoming data to fill the TCP buffers, this could potentially
make things block at unexpected places. For the upcoming RTMPT support,
we need to consume all incoming data before we can send the next
request.

Signed-off-by: Martin Storsjö <martin@martin.st>
2012-06-14 22:22:58 +03:00

470 lines
15 KiB
C
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/*
* RTMP input format
* Copyright (c) 2009 Kostya Shishkov
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/bytestream.h"
#include "libavutil/avstring.h"
#include "libavutil/intfloat.h"
#include "avformat.h"
#include "rtmppkt.h"
#include "flv.h"
#include "url.h"
void ff_amf_write_bool(uint8_t **dst, int val)
{
bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
bytestream_put_byte(dst, val);
}
void ff_amf_write_number(uint8_t **dst, double val)
{
bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
bytestream_put_be64(dst, av_double2int(val));
}
void ff_amf_write_string(uint8_t **dst, const char *str)
{
bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
bytestream_put_be16(dst, strlen(str));
bytestream_put_buffer(dst, str, strlen(str));
}
void ff_amf_write_null(uint8_t **dst)
{
bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
}
void ff_amf_write_object_start(uint8_t **dst)
{
bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
}
void ff_amf_write_field_name(uint8_t **dst, const char *str)
{
bytestream_put_be16(dst, strlen(str));
bytestream_put_buffer(dst, str, strlen(str));
}
void ff_amf_write_object_end(uint8_t **dst)
{
/* first two bytes are field name length = 0,
* AMF object should end with it and end marker
*/
bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
}
int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
int chunk_size, RTMPPacket *prev_pkt)
{
uint8_t hdr;
if (ffurl_read(h, &hdr, 1) != 1)
return AVERROR(EIO);
return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt, hdr);
}
int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
RTMPPacket *prev_pkt, uint8_t hdr)
{
uint8_t t, buf[16];
int channel_id, timestamp, data_size, offset = 0;
uint32_t extra = 0;
enum RTMPPacketType type;
int size = 0;
int ret;
size++;
channel_id = hdr & 0x3F;
if (channel_id < 2) { //special case for channel number >= 64
buf[1] = 0;
if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
return AVERROR(EIO);
size += channel_id + 1;
channel_id = AV_RL16(buf) + 64;
}
data_size = prev_pkt[channel_id].data_size;
type = prev_pkt[channel_id].type;
extra = prev_pkt[channel_id].extra;
hdr >>= 6;
if (hdr == RTMP_PS_ONEBYTE) {
timestamp = prev_pkt[channel_id].ts_delta;
} else {
if (ffurl_read_complete(h, buf, 3) != 3)
return AVERROR(EIO);
size += 3;
timestamp = AV_RB24(buf);
if (hdr != RTMP_PS_FOURBYTES) {
if (ffurl_read_complete(h, buf, 3) != 3)
return AVERROR(EIO);
size += 3;
data_size = AV_RB24(buf);
if (ffurl_read_complete(h, buf, 1) != 1)
return AVERROR(EIO);
size++;
type = buf[0];
if (hdr == RTMP_PS_TWELVEBYTES) {
if (ffurl_read_complete(h, buf, 4) != 4)
return AVERROR(EIO);
size += 4;
extra = AV_RL32(buf);
}
}
if (timestamp == 0xFFFFFF) {
if (ffurl_read_complete(h, buf, 4) != 4)
return AVERROR(EIO);
timestamp = AV_RB32(buf);
}
}
if (hdr != RTMP_PS_TWELVEBYTES)
timestamp += prev_pkt[channel_id].timestamp;
if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
data_size)) < 0)
return ret;
p->extra = extra;
// save history
prev_pkt[channel_id].channel_id = channel_id;
prev_pkt[channel_id].type = type;
prev_pkt[channel_id].data_size = data_size;
prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
prev_pkt[channel_id].timestamp = timestamp;
prev_pkt[channel_id].extra = extra;
while (data_size > 0) {
int toread = FFMIN(data_size, chunk_size);
if (ffurl_read_complete(h, p->data + offset, toread) != toread) {
ff_rtmp_packet_destroy(p);
return AVERROR(EIO);
}
data_size -= chunk_size;
offset += chunk_size;
size += chunk_size;
if (data_size > 0) {
if ((ret = ffurl_read_complete(h, &t, 1)) < 0) { // marker
ff_rtmp_packet_destroy(p);
return ret;
}
size++;
if (t != (0xC0 + channel_id))
return -1;
}
}
return size;
}
int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
int chunk_size, RTMPPacket *prev_pkt)
{
uint8_t pkt_hdr[16], *p = pkt_hdr;
int mode = RTMP_PS_TWELVEBYTES;
int off = 0;
int size = 0;
int ret;
pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
//if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
if (prev_pkt[pkt->channel_id].channel_id &&
pkt->extra == prev_pkt[pkt->channel_id].extra) {
if (pkt->type == prev_pkt[pkt->channel_id].type &&
pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
mode = RTMP_PS_FOURBYTES;
if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
mode = RTMP_PS_ONEBYTE;
} else {
mode = RTMP_PS_EIGHTBYTES;
}
}
if (pkt->channel_id < 64) {
bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
} else if (pkt->channel_id < 64 + 256) {
bytestream_put_byte(&p, 0 | (mode << 6));
bytestream_put_byte(&p, pkt->channel_id - 64);
} else {
bytestream_put_byte(&p, 1 | (mode << 6));
bytestream_put_le16(&p, pkt->channel_id - 64);
}
if (mode != RTMP_PS_ONEBYTE) {
uint32_t timestamp = pkt->timestamp;
if (mode != RTMP_PS_TWELVEBYTES)
timestamp = pkt->ts_delta;
bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
if (mode != RTMP_PS_FOURBYTES) {
bytestream_put_be24(&p, pkt->data_size);
bytestream_put_byte(&p, pkt->type);
if (mode == RTMP_PS_TWELVEBYTES)
bytestream_put_le32(&p, pkt->extra);
}
if (timestamp >= 0xFFFFFF)
bytestream_put_be32(&p, timestamp);
}
// save history
prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
prev_pkt[pkt->channel_id].type = pkt->type;
prev_pkt[pkt->channel_id].data_size = pkt->data_size;
prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
if (mode != RTMP_PS_TWELVEBYTES) {
prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
} else {
prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
}
prev_pkt[pkt->channel_id].extra = pkt->extra;
if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
return ret;
size = p - pkt_hdr + pkt->data_size;
while (off < pkt->data_size) {
int towrite = FFMIN(chunk_size, pkt->data_size - off);
if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
return ret;
off += towrite;
if (off < pkt->data_size) {
uint8_t marker = 0xC0 | pkt->channel_id;
if ((ret = ffurl_write(h, &marker, 1)) < 0)
return ret;
size++;
}
}
return size;
}
int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
int timestamp, int size)
{
if (size) {
pkt->data = av_malloc(size);
if (!pkt->data)
return AVERROR(ENOMEM);
}
pkt->data_size = size;
pkt->channel_id = channel_id;
pkt->type = type;
pkt->timestamp = timestamp;
pkt->extra = 0;
pkt->ts_delta = 0;
return 0;
}
void ff_rtmp_packet_destroy(RTMPPacket *pkt)
{
if (!pkt)
return;
av_freep(&pkt->data);
pkt->data_size = 0;
}
int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
{
const uint8_t *base = data;
if (data >= data_end)
return -1;
switch (*data++) {
case AMF_DATA_TYPE_NUMBER: return 9;
case AMF_DATA_TYPE_BOOL: return 2;
case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
case AMF_DATA_TYPE_NULL: return 1;
case AMF_DATA_TYPE_ARRAY:
data += 4;
case AMF_DATA_TYPE_OBJECT:
for (;;) {
int size = bytestream_get_be16(&data);
int t;
if (!size) {
data++;
break;
}
if (data + size >= data_end || data + size < data)
return -1;
data += size;
t = ff_amf_tag_size(data, data_end);
if (t < 0 || data + t >= data_end)
return -1;
data += t;
}
return data - base;
case AMF_DATA_TYPE_OBJECT_END: return 1;
default: return -1;
}
}
int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
const uint8_t *name, uint8_t *dst, int dst_size)
{
int namelen = strlen(name);
int len;
while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
len = ff_amf_tag_size(data, data_end);
if (len < 0)
len = data_end - data;
data += len;
}
if (data_end - data < 3)
return -1;
data++;
for (;;) {
int size = bytestream_get_be16(&data);
if (!size)
break;
if (data + size >= data_end || data + size < data)
return -1;
data += size;
if (size == namelen && !memcmp(data-size, name, namelen)) {
switch (*data++) {
case AMF_DATA_TYPE_NUMBER:
snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
break;
case AMF_DATA_TYPE_BOOL:
snprintf(dst, dst_size, "%s", *data ? "true" : "false");
break;
case AMF_DATA_TYPE_STRING:
len = bytestream_get_be16(&data);
av_strlcpy(dst, data, FFMIN(len+1, dst_size));
break;
default:
return -1;
}
return 0;
}
len = ff_amf_tag_size(data, data_end);
if (len < 0 || data + len >= data_end || data + len < data)
return -1;
data += len;
}
return -1;
}
static const char* rtmp_packet_type(int type)
{
switch (type) {
case RTMP_PT_CHUNK_SIZE: return "chunk size";
case RTMP_PT_BYTES_READ: return "bytes read";
case RTMP_PT_PING: return "ping";
case RTMP_PT_SERVER_BW: return "server bandwidth";
case RTMP_PT_CLIENT_BW: return "client bandwidth";
case RTMP_PT_AUDIO: return "audio packet";
case RTMP_PT_VIDEO: return "video packet";
case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
case RTMP_PT_NOTIFY: return "notification";
case RTMP_PT_SHARED_OBJ: return "shared object";
case RTMP_PT_INVOKE: return "invoke";
case RTMP_PT_METADATA: return "metadata";
default: return "unknown";
}
}
static void ff_amf_tag_contents(void *ctx, const uint8_t *data, const uint8_t *data_end)
{
int size;
char buf[1024];
if (data >= data_end)
return;
switch (*data++) {
case AMF_DATA_TYPE_NUMBER:
av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
return;
case AMF_DATA_TYPE_BOOL:
av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
return;
case AMF_DATA_TYPE_STRING:
case AMF_DATA_TYPE_LONG_STRING:
if (data[-1] == AMF_DATA_TYPE_STRING) {
size = bytestream_get_be16(&data);
} else {
size = bytestream_get_be32(&data);
}
size = FFMIN(size, 1023);
memcpy(buf, data, size);
buf[size] = 0;
av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
return;
case AMF_DATA_TYPE_NULL:
av_log(ctx, AV_LOG_DEBUG, " NULL\n");
return;
case AMF_DATA_TYPE_ARRAY:
data += 4;
case AMF_DATA_TYPE_OBJECT:
av_log(ctx, AV_LOG_DEBUG, " {\n");
for (;;) {
int size = bytestream_get_be16(&data);
int t;
memcpy(buf, data, size);
buf[size] = 0;
if (!size) {
av_log(ctx, AV_LOG_DEBUG, " }\n");
data++;
break;
}
if (data + size >= data_end || data + size < data)
return;
data += size;
av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
ff_amf_tag_contents(ctx, data, data_end);
t = ff_amf_tag_size(data, data_end);
if (t < 0 || data + t >= data_end)
return;
data += t;
}
return;
case AMF_DATA_TYPE_OBJECT_END:
av_log(ctx, AV_LOG_DEBUG, " }\n");
return;
default:
return;
}
}
void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
{
av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->data_size);
if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
uint8_t *src = p->data, *src_end = p->data + p->data_size;
while (src < src_end) {
int sz;
ff_amf_tag_contents(ctx, src, src_end);
sz = ff_amf_tag_size(src, src_end);
if (sz < 0)
break;
src += sz;
}
} else if (p->type == RTMP_PT_SERVER_BW){
av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
} else if (p->type == RTMP_PT_CLIENT_BW){
av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
} else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
int i;
for (i = 0; i < p->data_size; i++)
av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
av_log(ctx, AV_LOG_DEBUG, "\n");
}
}
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