mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
447 lines
14 KiB
447 lines
14 KiB
/* |
|
* 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 "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_dbl2int(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, t, buf[16]; |
|
int channel_id, timestamp, data_size, offset = 0; |
|
uint32_t extra = 0; |
|
enum RTMPPacketType type; |
|
int size = 0; |
|
|
|
if (ffurl_read(h, &hdr, 1) != 1) |
|
return AVERROR(EIO); |
|
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 (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size)) |
|
return -1; |
|
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) { |
|
ffurl_read_complete(h, &t, 1); //marker |
|
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; |
|
|
|
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; |
|
|
|
ffurl_write(h, pkt_hdr, p-pkt_hdr); |
|
size = p - pkt_hdr + pkt->data_size; |
|
while (off < pkt->data_size) { |
|
int towrite = FFMIN(chunk_size, pkt->data_size - off); |
|
ffurl_write(h, pkt->data + off, towrite); |
|
off += towrite; |
|
if (off < pkt->data_size) { |
|
uint8_t marker = 0xC0 | pkt->channel_id; |
|
ffurl_write(h, &marker, 1); |
|
size++; |
|
} |
|
} |
|
return size; |
|
} |
|
|
|
int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type, |
|
int timestamp, int 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_int2dbl(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_int2dbl(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"); |
|
} |
|
}
|
|
|