3 * Copyright (c) 2009 Kostya Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavcodec/bytestream.h"
23 #include "libavutil/avstring.h"
29 void ff_amf_write_bool(uint8_t **dst, int val)
31 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
32 bytestream_put_byte(dst, val);
35 void ff_amf_write_number(uint8_t **dst, double val)
37 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
38 bytestream_put_be64(dst, av_dbl2int(val));
41 void ff_amf_write_string(uint8_t **dst, const char *str)
43 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
44 bytestream_put_be16(dst, strlen(str));
45 bytestream_put_buffer(dst, str, strlen(str));
48 void ff_amf_write_null(uint8_t **dst)
50 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
53 void ff_amf_write_object_start(uint8_t **dst)
55 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
58 void ff_amf_write_field_name(uint8_t **dst, const char *str)
60 bytestream_put_be16(dst, strlen(str));
61 bytestream_put_buffer(dst, str, strlen(str));
64 void ff_amf_write_object_end(uint8_t **dst)
66 /* first two bytes are field name length = 0,
67 * AMF object should end with it and end marker
69 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
72 int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
73 int chunk_size, RTMPPacket *prev_pkt)
75 uint8_t hdr, t, buf[16];
76 int channel_id, timestamp, data_size, offset = 0;
80 if (url_read(h, &hdr, 1) != 1)
82 channel_id = hdr & 0x3F;
84 data_size = prev_pkt[channel_id].data_size;
85 type = prev_pkt[channel_id].type;
86 extra = prev_pkt[channel_id].extra;
89 if (hdr == RTMP_PS_ONEBYTE) {
90 timestamp = prev_pkt[channel_id].timestamp;
92 if (url_read_complete(h, buf, 3) != 3)
94 timestamp = AV_RB24(buf);
95 if (hdr != RTMP_PS_FOURBYTES) {
96 if (url_read_complete(h, buf, 3) != 3)
98 data_size = AV_RB24(buf);
99 if (url_read_complete(h, &type, 1) != 1)
101 if (hdr == RTMP_PS_TWELVEBYTES) {
102 if (url_read_complete(h, buf, 4) != 4)
104 extra = AV_RL32(buf);
108 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size))
112 prev_pkt[channel_id].channel_id = channel_id;
113 prev_pkt[channel_id].type = type;
114 prev_pkt[channel_id].data_size = data_size;
115 prev_pkt[channel_id].timestamp = timestamp;
116 prev_pkt[channel_id].extra = extra;
117 while (data_size > 0) {
118 int toread = FFMIN(data_size, chunk_size);
119 if (url_read_complete(h, p->data + offset, toread) != toread) {
120 ff_rtmp_packet_destroy(p);
123 data_size -= chunk_size;
124 offset += chunk_size;
126 url_read_complete(h, &t, 1); //marker
127 if (t != (0xC0 + channel_id))
134 int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
135 int chunk_size, RTMPPacket *prev_pkt)
137 uint8_t pkt_hdr[16], *p = pkt_hdr;
138 int mode = RTMP_PS_TWELVEBYTES;
141 //TODO: header compression
142 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
143 if (mode != RTMP_PS_ONEBYTE) {
144 bytestream_put_be24(&p, pkt->timestamp);
145 if (mode != RTMP_PS_FOURBYTES) {
146 bytestream_put_be24(&p, pkt->data_size);
147 bytestream_put_byte(&p, pkt->type);
148 if (mode == RTMP_PS_TWELVEBYTES)
149 bytestream_put_le32(&p, pkt->extra);
152 url_write(h, pkt_hdr, p-pkt_hdr);
153 while (off < pkt->data_size) {
154 int towrite = FFMIN(chunk_size, pkt->data_size - off);
155 url_write(h, pkt->data + off, towrite);
157 if (off < pkt->data_size) {
158 uint8_t marker = 0xC0 | pkt->channel_id;
159 url_write(h, &marker, 1);
165 int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
166 int timestamp, int size)
168 pkt->data = av_malloc(size);
170 return AVERROR(ENOMEM);
171 pkt->data_size = size;
172 pkt->channel_id = channel_id;
174 pkt->timestamp = timestamp;
180 void ff_rtmp_packet_destroy(RTMPPacket *pkt)
184 av_freep(&pkt->data);
188 int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
190 const uint8_t *base = data;
192 if (data >= data_end)
195 case AMF_DATA_TYPE_NUMBER: return 9;
196 case AMF_DATA_TYPE_BOOL: return 2;
197 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
198 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
199 case AMF_DATA_TYPE_NULL: return 1;
200 case AMF_DATA_TYPE_ARRAY:
202 case AMF_DATA_TYPE_OBJECT:
204 int size = bytestream_get_be16(&data);
210 if (data + size >= data_end || data + size < data)
213 t = ff_amf_tag_size(data, data_end);
214 if (t < 0 || data + t >= data_end)
219 case AMF_DATA_TYPE_OBJECT_END: return 1;
224 int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
225 const uint8_t *name, uint8_t *dst, int dst_size)
227 int namelen = strlen(name);
230 if (data_end - data < 3)
232 if (*data++ != AMF_DATA_TYPE_OBJECT)
235 int size = bytestream_get_be16(&data);
238 if (data + size >= data_end || data + size < data)
241 if (size == namelen && !memcmp(data-size, name, namelen)) {
243 case AMF_DATA_TYPE_NUMBER:
244 snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data)));
246 case AMF_DATA_TYPE_BOOL:
247 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
249 case AMF_DATA_TYPE_STRING:
250 len = bytestream_get_be16(&data);
251 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
258 len = ff_amf_tag_size(data, data_end);
259 if (len < 0 || data + len >= data_end || data + len < data)