5l trocadero: don't forget to free packet in gen_connect()
[libav.git] / libavformat / rtmppkt.c
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1/*
2 * RTMP input format
3 * Copyright (c) 2009 Kostya Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22#include "libavcodec/bytestream.h"
23#include "libavutil/avstring.h"
24#include "avformat.h"
25
26#include "rtmppkt.h"
27#include "flv.h"
28
29void ff_amf_write_bool(uint8_t **dst, int val)
30{
31 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
32 bytestream_put_byte(dst, val);
33}
34
35void ff_amf_write_number(uint8_t **dst, double val)
36{
37 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
38 bytestream_put_be64(dst, av_dbl2int(val));
39}
40
41void ff_amf_write_string(uint8_t **dst, const char *str)
42{
43 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
44 bytestream_put_be16(dst, strlen(str));
45 bytestream_put_buffer(dst, str, strlen(str));
46}
47
48void ff_amf_write_null(uint8_t **dst)
49{
50 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
51}
52
53void ff_amf_write_object_start(uint8_t **dst)
54{
55 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
56}
57
58void ff_amf_write_field_name(uint8_t **dst, const char *str)
59{
60 bytestream_put_be16(dst, strlen(str));
61 bytestream_put_buffer(dst, str, strlen(str));
62}
63
64void ff_amf_write_object_end(uint8_t **dst)
65{
66 /* first two bytes are field name length = 0,
67 * AMF object should end with it and end marker
68 */
69 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
70}
71
72int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
73 int chunk_size, RTMPPacket *prev_pkt)
74{
75 uint8_t hdr, t, buf[16];
76 int channel_id, timestamp, data_size, offset = 0;
77 uint32_t extra = 0;
0f87b771 78 enum RTMPPacketType type;
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79
80 if (url_read(h, &hdr, 1) != 1)
81 return AVERROR(EIO);
82 channel_id = hdr & 0x3F;
83
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84 if (channel_id < 2) { //special case for channel number >= 64
85 buf[1] = 0;
86 if (url_read_complete(h, buf, channel_id + 1) != channel_id + 1)
87 return AVERROR(EIO);
88 channel_id = AV_RL16(buf) + 64;
89 }
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90 data_size = prev_pkt[channel_id].data_size;
91 type = prev_pkt[channel_id].type;
92 extra = prev_pkt[channel_id].extra;
93
94 hdr >>= 6;
95 if (hdr == RTMP_PS_ONEBYTE) {
a352b605 96 timestamp = prev_pkt[channel_id].ts_delta;
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97 } else {
98 if (url_read_complete(h, buf, 3) != 3)
99 return AVERROR(EIO);
100 timestamp = AV_RB24(buf);
101 if (hdr != RTMP_PS_FOURBYTES) {
102 if (url_read_complete(h, buf, 3) != 3)
103 return AVERROR(EIO);
104 data_size = AV_RB24(buf);
1ab21f19 105 if (url_read_complete(h, buf, 1) != 1)
9fd6b843 106 return AVERROR(EIO);
1ab21f19 107 type = buf[0];
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108 if (hdr == RTMP_PS_TWELVEBYTES) {
109 if (url_read_complete(h, buf, 4) != 4)
110 return AVERROR(EIO);
111 extra = AV_RL32(buf);
112 }
113 }
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114 if (timestamp == 0xFFFFFF) {
115 if (url_read_complete(h, buf, 4) != 4)
116 return AVERROR(EIO);
117 timestamp = AV_RB32(buf);
118 }
9fd6b843 119 }
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120 if (hdr != RTMP_PS_TWELVEBYTES)
121 timestamp += prev_pkt[channel_id].timestamp;
122
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123 if (ff_rtmp_packet_create(p, channel_id, type, timestamp, data_size))
124 return -1;
125 p->extra = extra;
126 // save history
127 prev_pkt[channel_id].channel_id = channel_id;
128 prev_pkt[channel_id].type = type;
129 prev_pkt[channel_id].data_size = data_size;
a352b605 130 prev_pkt[channel_id].ts_delta = timestamp - prev_pkt[channel_id].timestamp;
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131 prev_pkt[channel_id].timestamp = timestamp;
132 prev_pkt[channel_id].extra = extra;
133 while (data_size > 0) {
134 int toread = FFMIN(data_size, chunk_size);
135 if (url_read_complete(h, p->data + offset, toread) != toread) {
136 ff_rtmp_packet_destroy(p);
137 return AVERROR(EIO);
138 }
139 data_size -= chunk_size;
140 offset += chunk_size;
141 if (data_size > 0) {
142 url_read_complete(h, &t, 1); //marker
143 if (t != (0xC0 + channel_id))
144 return -1;
145 }
146 }
147 return 0;
148}
149
150int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
151 int chunk_size, RTMPPacket *prev_pkt)
152{
153 uint8_t pkt_hdr[16], *p = pkt_hdr;
154 int mode = RTMP_PS_TWELVEBYTES;
155 int off = 0;
a352b605 156 pkt->ts_delta = pkt->timestamp - prev_pkt[pkt->channel_id].timestamp;
9fd6b843 157
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158 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
159 if (prev_pkt[pkt->channel_id].channel_id &&
160 pkt->extra == prev_pkt[pkt->channel_id].extra) {
161 if (pkt->type == prev_pkt[pkt->channel_id].type &&
162 pkt->data_size == prev_pkt[pkt->channel_id].data_size) {
163 mode = RTMP_PS_FOURBYTES;
164 if (pkt->ts_delta == prev_pkt[pkt->channel_id].ts_delta)
165 mode = RTMP_PS_ONEBYTE;
166 } else {
167 mode = RTMP_PS_EIGHTBYTES;
168 }
169 }
170
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171 if (pkt->channel_id < 64) {
172 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
173 } else if (pkt->channel_id < 64 + 256) {
174 bytestream_put_byte(&p, 0 | (mode << 6));
175 bytestream_put_byte(&p, pkt->channel_id - 64);
176 } else {
177 bytestream_put_byte(&p, 1 | (mode << 6));
178 bytestream_put_le16(&p, pkt->channel_id - 64);
179 }
9fd6b843 180 if (mode != RTMP_PS_ONEBYTE) {
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181 uint32_t timestamp = pkt->timestamp;
182 if (mode != RTMP_PS_TWELVEBYTES)
a352b605 183 timestamp = pkt->ts_delta;
817d967d 184 bytestream_put_be24(&p, timestamp >= 0xFFFFFF ? 0xFFFFFF : timestamp);
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185 if (mode != RTMP_PS_FOURBYTES) {
186 bytestream_put_be24(&p, pkt->data_size);
187 bytestream_put_byte(&p, pkt->type);
188 if (mode == RTMP_PS_TWELVEBYTES)
189 bytestream_put_le32(&p, pkt->extra);
190 }
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191 if (timestamp >= 0xFFFFFF)
192 bytestream_put_be32(&p, timestamp);
9fd6b843 193 }
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194 // save history
195 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
196 prev_pkt[pkt->channel_id].type = pkt->type;
197 prev_pkt[pkt->channel_id].data_size = pkt->data_size;
198 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
199 if (mode != RTMP_PS_TWELVEBYTES) {
200 prev_pkt[pkt->channel_id].ts_delta = pkt->ts_delta;
201 } else {
202 prev_pkt[pkt->channel_id].ts_delta = pkt->timestamp;
203 }
204 prev_pkt[pkt->channel_id].extra = pkt->extra;
205
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206 url_write(h, pkt_hdr, p-pkt_hdr);
207 while (off < pkt->data_size) {
208 int towrite = FFMIN(chunk_size, pkt->data_size - off);
209 url_write(h, pkt->data + off, towrite);
210 off += towrite;
211 if (off < pkt->data_size) {
212 uint8_t marker = 0xC0 | pkt->channel_id;
213 url_write(h, &marker, 1);
214 }
215 }
216 return 0;
217}
218
219int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
220 int timestamp, int size)
221{
222 pkt->data = av_malloc(size);
223 if (!pkt->data)
224 return AVERROR(ENOMEM);
225 pkt->data_size = size;
226 pkt->channel_id = channel_id;
227 pkt->type = type;
228 pkt->timestamp = timestamp;
229 pkt->extra = 0;
a352b605 230 pkt->ts_delta = 0;
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231
232 return 0;
233}
234
235void ff_rtmp_packet_destroy(RTMPPacket *pkt)
236{
237 if (!pkt)
238 return;
239 av_freep(&pkt->data);
240 pkt->data_size = 0;
241}
242
243int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
244{
245 const uint8_t *base = data;
246
247 if (data >= data_end)
248 return -1;
249 switch (*data++) {
250 case AMF_DATA_TYPE_NUMBER: return 9;
251 case AMF_DATA_TYPE_BOOL: return 2;
252 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
253 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
254 case AMF_DATA_TYPE_NULL: return 1;
255 case AMF_DATA_TYPE_ARRAY:
256 data += 4;
257 case AMF_DATA_TYPE_OBJECT:
258 for (;;) {
259 int size = bytestream_get_be16(&data);
260 int t;
261 if (!size) {
262 data++;
263 break;
264 }
265 if (data + size >= data_end || data + size < data)
266 return -1;
267 data += size;
268 t = ff_amf_tag_size(data, data_end);
269 if (t < 0 || data + t >= data_end)
270 return -1;
271 data += t;
272 }
273 return data - base;
274 case AMF_DATA_TYPE_OBJECT_END: return 1;
275 default: return -1;
276 }
277}
278
279int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
280 const uint8_t *name, uint8_t *dst, int dst_size)
281{
282 int namelen = strlen(name);
283 int len;
284
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285 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
286 len = ff_amf_tag_size(data, data_end);
287 if (len < 0)
288 len = data_end - data;
289 data += len;
290 }
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291 if (data_end - data < 3)
292 return -1;
87ca1b8f 293 data++;
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294 for (;;) {
295 int size = bytestream_get_be16(&data);
296 if (!size)
297 break;
298 if (data + size >= data_end || data + size < data)
299 return -1;
300 data += size;
301 if (size == namelen && !memcmp(data-size, name, namelen)) {
302 switch (*data++) {
303 case AMF_DATA_TYPE_NUMBER:
304 snprintf(dst, dst_size, "%g", av_int2dbl(AV_RB64(data)));
305 break;
306 case AMF_DATA_TYPE_BOOL:
307 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
308 break;
309 case AMF_DATA_TYPE_STRING:
310 len = bytestream_get_be16(&data);
311 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
312 break;
313 default:
314 return -1;
315 }
316 return 0;
317 }
318 len = ff_amf_tag_size(data, data_end);
319 if (len < 0 || data + len >= data_end || data + len < data)
320 return -1;
321 data += len;
322 }
323 return -1;
324}