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/*
* RTMP input format |
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* Copyright (c) 2009 Konstantin Shishkov |
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*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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" |
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#include "libavutil/intfloat.h" |
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#include "avformat.h"
#include "rtmppkt.h"
#include "flv.h" |
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#include "url.h" |
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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); |
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bytestream_put_be64(dst, av_double2int(val)); |
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}
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));
}
|
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void ff_amf_write_string2(uint8_t **dst, const char *str1, const char *str2)
{
int len1 = 0, len2 = 0;
if (str1)
len1 = strlen(str1);
if (str2)
len2 = strlen(str2);
bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
bytestream_put_be16(dst, len1 + len2);
bytestream_put_buffer(dst, str1, len1);
bytestream_put_buffer(dst, str2, len2);
}
|
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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);
}
|
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int ff_amf_read_bool(GetByteContext *bc, int *val)
{
if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_BOOL)
return AVERROR_INVALIDDATA;
*val = bytestream2_get_byte(bc);
return 0;
}
int ff_amf_read_number(GetByteContext *bc, double *val)
{
uint64_t read;
if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NUMBER)
return AVERROR_INVALIDDATA;
read = bytestream2_get_be64(bc);
*val = av_int2double(read);
return 0;
}
int ff_amf_read_string(GetByteContext *bc, uint8_t *str,
int strsize, int *length)
{
int stringlen = 0;
int readsize;
if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)
return AVERROR_INVALIDDATA;
stringlen = bytestream2_get_be16(bc);
if (stringlen + 1 > strsize)
return AVERROR(EINVAL);
readsize = bytestream2_get_buffer(bc, str, stringlen);
if (readsize != stringlen) {
av_log(NULL, AV_LOG_WARNING,
"Unable to read as many bytes as AMF string signaled\n");
}
str[readsize] = '\0';
*length = FFMIN(stringlen, readsize);
return 0;
}
int ff_amf_read_null(GetByteContext *bc)
{
if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)
return AVERROR_INVALIDDATA;
return 0;
}
|
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int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
int chunk_size, RTMPPacket *prev_pkt)
{ |
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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]; |
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int channel_id, timestamp, data_size, offset = 0;
uint32_t extra = 0; |
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enum RTMPPacketType type; |
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int size = 0; |
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int ret; |
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|
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size++; |
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channel_id = hdr & 0x3F;
|
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if (channel_id < 2) { //special case for channel number >= 64
buf[1] = 0; |
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if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1) |
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return AVERROR(EIO); |
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size += channel_id + 1; |
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channel_id = AV_RL16(buf) + 64;
} |
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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) { |
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timestamp = prev_pkt[channel_id].ts_delta; |
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} else { |
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if (ffurl_read_complete(h, buf, 3) != 3) |
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return AVERROR(EIO); |
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size += 3; |
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timestamp = AV_RB24(buf);
if (hdr != RTMP_PS_FOURBYTES) { |
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if (ffurl_read_complete(h, buf, 3) != 3) |
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return AVERROR(EIO); |
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size += 3; |
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data_size = AV_RB24(buf); |
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if (ffurl_read_complete(h, buf, 1) != 1) |
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return AVERROR(EIO); |
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size++; |
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type = buf[0]; |
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if (hdr == RTMP_PS_TWELVEBYTES) { |
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if (ffurl_read_complete(h, buf, 4) != 4) |
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return AVERROR(EIO); |
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size += 4; |
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extra = AV_RL32(buf);
}
} |
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if (timestamp == 0xFFFFFF) { |
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if (ffurl_read_complete(h, buf, 4) != 4) |
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return AVERROR(EIO);
timestamp = AV_RB32(buf);
} |
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} |
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if (hdr != RTMP_PS_TWELVEBYTES)
timestamp += prev_pkt[channel_id].timestamp;
|
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if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
data_size)) < 0)
return ret; |
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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; |
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prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp; |
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prev_pkt[channel_id].timestamp = timestamp;
prev_pkt[channel_id].extra = extra;
while (data_size > 0) {
int toread = FFMIN(data_size, chunk_size); |
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if (ffurl_read_complete(h, p->data + offset, toread) != toread) { |
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ff_rtmp_packet_destroy(p);
return AVERROR(EIO);
}
data_size -= chunk_size;
offset += chunk_size; |
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size += chunk_size; |
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if (data_size > 0) { |
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if ((ret = ffurl_read_complete(h, &t, 1)) < 0) { // marker
ff_rtmp_packet_destroy(p);
return ret;
} |
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size++; |
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if (t != (0xC0 + channel_id))
return -1;
}
} |
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return size; |
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}
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; |
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int size = 0; |
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int ret; |
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|
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pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp; |
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//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;
}
}
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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);
} |
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if (mode != RTMP_PS_ONEBYTE) { |
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uint32_t timestamp = pkt->timestamp;
if (mode != RTMP_PS_TWELVEBYTES) |
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timestamp = pkt->ts_delta; |
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bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp); |
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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);
} |
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if (timestamp >= 0xFFFFFF)
bytestream_put_be32(&p, timestamp); |
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} |
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// 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;
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if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
return ret; |
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size = p - pkt_hdr + pkt->data_size; |
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while (off < pkt->data_size) {
int towrite = FFMIN(chunk_size, pkt->data_size - off); |
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if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
return ret; |
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off += towrite;
if (off < pkt->data_size) {
uint8_t marker = 0xC0 | pkt->channel_id; |
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if ((ret = ffurl_write(h, &marker, 1)) < 0)
return ret; |
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size++; |
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}
} |
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return size; |
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}
int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
int timestamp, int size)
{ |
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if (size) { |
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pkt->data = av_malloc(size);
if (!pkt->data)
return AVERROR(ENOMEM); |
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} |
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pkt->data_size = size;
pkt->channel_id = channel_id;
pkt->type = type;
pkt->timestamp = timestamp;
pkt->extra = 0; |
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pkt->ts_delta = 0; |
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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;
} |
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if (size < 0 || size >= data_end - data) |
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return -1;
data += size;
t = ff_amf_tag_size(data, data_end); |
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if (t < 0 || t >= data_end - data) |
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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;
|
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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;
} |
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if (data_end - data < 3)
return -1; |
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data++; |
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for (;;) {
int size = bytestream_get_be16(&data);
if (!size)
break; |
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if (size < 0 || size >= data_end - data) |
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return -1;
data += size;
if (size == namelen && !memcmp(data-size, name, namelen)) {
switch (*data++) {
case AMF_DATA_TYPE_NUMBER: |
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snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data))); |
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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); |
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if (len < 0 || len >= data_end - data) |
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return -1;
data += len;
}
return -1;
} |
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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";
}
}
|
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static void amf_tag_contents(void *ctx, const uint8_t *data,
const uint8_t *data_end) |
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{ |
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unsigned int size; |
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char buf[1024];
if (data >= data_end)
return;
switch (*data++) {
case AMF_DATA_TYPE_NUMBER: |
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av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data))); |
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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 { |
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size = bytestream_get_be32(&data); |
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} |
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size = FFMIN(size, sizeof(buf) - 1); |
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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 t; |
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size = bytestream_get_be16(&data);
av_strlcpy(buf, data, FFMIN(sizeof(buf), size + 1)); |
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if (!size) {
av_log(ctx, AV_LOG_DEBUG, " }\n");
data++;
break;
} |
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if (size >= data_end - data) |
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return;
data += size;
av_log(ctx, AV_LOG_DEBUG, " %s: ", buf); |
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amf_tag_contents(ctx, data, data_end); |
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t = ff_amf_tag_size(data, data_end); |
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if (t < 0 || t >= data_end - data) |
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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; |
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amf_tag_contents(ctx, src, src_end); |
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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");
}
} |