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2ba45a60 DM |
1 | /* |
2 | * Microsoft RTP/ASF support. | |
3 | * Copyright (c) 2008 Ronald S. Bultje | |
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 | /** | |
23 | * @file | |
24 | * @brief Microsoft RTP/ASF support | |
25 | * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net> | |
26 | */ | |
27 | ||
f6fa7814 | 28 | #include "libavutil/avassert.h" |
2ba45a60 DM |
29 | #include "libavutil/base64.h" |
30 | #include "libavutil/avstring.h" | |
31 | #include "libavutil/intreadwrite.h" | |
32 | #include "rtp.h" | |
33 | #include "rtpdec_formats.h" | |
34 | #include "rtsp.h" | |
35 | #include "asf.h" | |
36 | #include "avio_internal.h" | |
37 | #include "internal.h" | |
38 | ||
39 | /** | |
40 | * From MSDN 2.2.1.4, we learn that ASF data packets over RTP should not | |
41 | * contain any padding. Unfortunately, the header min/max_pktsize are not | |
42 | * updated (thus making min_pktsize invalid). Here, we "fix" these faulty | |
43 | * min_pktsize values in the ASF file header. | |
44 | * @return 0 on success, <0 on failure (currently -1). | |
45 | */ | |
46 | static int rtp_asf_fix_header(uint8_t *buf, int len) | |
47 | { | |
48 | uint8_t *p = buf, *end = buf + len; | |
49 | ||
50 | if (len < sizeof(ff_asf_guid) * 2 + 22 || | |
51 | memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) { | |
52 | return -1; | |
53 | } | |
54 | p += sizeof(ff_asf_guid) + 14; | |
55 | do { | |
56 | uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid)); | |
57 | if (memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) { | |
58 | if (chunksize > end - p) | |
59 | return -1; | |
60 | p += chunksize; | |
61 | continue; | |
62 | } | |
63 | ||
64 | /* skip most of the file header, to min_pktsize */ | |
65 | p += 6 * 8 + 3 * 4 + sizeof(ff_asf_guid) * 2; | |
66 | if (p + 8 <= end && AV_RL32(p) == AV_RL32(p + 4)) { | |
67 | /* and set that to zero */ | |
68 | AV_WL32(p, 0); | |
69 | return 0; | |
70 | } | |
71 | break; | |
72 | } while (end - p >= sizeof(ff_asf_guid) + 8); | |
73 | ||
74 | return -1; | |
75 | } | |
76 | ||
77 | /** | |
78 | * The following code is basically a buffered AVIOContext, | |
79 | * with the added benefit of returning -EAGAIN (instead of 0) | |
80 | * on packet boundaries, such that the ASF demuxer can return | |
81 | * safely and resume business at the next packet. | |
82 | */ | |
83 | static int packetizer_read(void *opaque, uint8_t *buf, int buf_size) | |
84 | { | |
85 | return AVERROR(EAGAIN); | |
86 | } | |
87 | ||
88 | static void init_packetizer(AVIOContext *pb, uint8_t *buf, int len) | |
89 | { | |
90 | ffio_init_context(pb, buf, len, 0, NULL, packetizer_read, NULL, NULL); | |
91 | ||
92 | /* this "fills" the buffer with its current content */ | |
93 | pb->pos = len; | |
94 | pb->buf_end = buf + len; | |
95 | } | |
96 | ||
97 | int ff_wms_parse_sdp_a_line(AVFormatContext *s, const char *p) | |
98 | { | |
99 | int ret = 0; | |
100 | if (av_strstart(p, "pgmpu:data:application/vnd.ms.wms-hdr.asfv1;base64,", &p)) { | |
101 | AVIOContext pb; | |
102 | RTSPState *rt = s->priv_data; | |
103 | AVDictionary *opts = NULL; | |
104 | int len = strlen(p) * 6 / 8; | |
105 | char *buf = av_mallocz(len); | |
f6fa7814 DM |
106 | AVInputFormat *iformat; |
107 | ||
2ba45a60 DM |
108 | av_base64_decode(buf, p, len); |
109 | ||
110 | if (rtp_asf_fix_header(buf, len) < 0) | |
111 | av_log(s, AV_LOG_ERROR, | |
112 | "Failed to fix invalid RTSP-MS/ASF min_pktsize\n"); | |
113 | init_packetizer(&pb, buf, len); | |
114 | if (rt->asf_ctx) { | |
115 | avformat_close_input(&rt->asf_ctx); | |
116 | } | |
f6fa7814 DM |
117 | if (!(iformat = av_find_input_format("asf"))) |
118 | return AVERROR_DEMUXER_NOT_FOUND; | |
2ba45a60 DM |
119 | if (!(rt->asf_ctx = avformat_alloc_context())) |
120 | return AVERROR(ENOMEM); | |
121 | rt->asf_ctx->pb = &pb; | |
122 | av_dict_set(&opts, "no_resync_search", "1", 0); | |
f6fa7814 DM |
123 | |
124 | if ((ret = ff_copy_whitelists(rt->asf_ctx, s)) < 0) { | |
125 | av_dict_free(&opts); | |
126 | return ret; | |
127 | } | |
128 | ||
129 | ret = avformat_open_input(&rt->asf_ctx, "", iformat, &opts); | |
2ba45a60 DM |
130 | av_dict_free(&opts); |
131 | if (ret < 0) | |
132 | return ret; | |
133 | av_dict_copy(&s->metadata, rt->asf_ctx->metadata, 0); | |
134 | rt->asf_pb_pos = avio_tell(&pb); | |
135 | av_free(buf); | |
136 | rt->asf_ctx->pb = NULL; | |
137 | } | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static int asfrtp_parse_sdp_line(AVFormatContext *s, int stream_index, | |
142 | PayloadContext *asf, const char *line) | |
143 | { | |
144 | if (stream_index < 0) | |
145 | return 0; | |
146 | if (av_strstart(line, "stream:", &line)) { | |
147 | RTSPState *rt = s->priv_data; | |
148 | ||
149 | s->streams[stream_index]->id = strtol(line, NULL, 10); | |
150 | ||
151 | if (rt->asf_ctx) { | |
152 | int i; | |
153 | ||
154 | for (i = 0; i < rt->asf_ctx->nb_streams; i++) { | |
155 | if (s->streams[stream_index]->id == rt->asf_ctx->streams[i]->id) { | |
156 | *s->streams[stream_index]->codec = | |
157 | *rt->asf_ctx->streams[i]->codec; | |
158 | s->streams[stream_index]->need_parsing = | |
159 | rt->asf_ctx->streams[i]->need_parsing; | |
160 | rt->asf_ctx->streams[i]->codec->extradata_size = 0; | |
161 | rt->asf_ctx->streams[i]->codec->extradata = NULL; | |
162 | avpriv_set_pts_info(s->streams[stream_index], 32, 1, 1000); | |
163 | } | |
164 | } | |
165 | } | |
166 | } | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
171 | struct PayloadContext { | |
172 | AVIOContext *pktbuf, pb; | |
173 | uint8_t *buf; | |
174 | }; | |
175 | ||
176 | /** | |
177 | * @return 0 when a packet was written into /p pkt, and no more data is left; | |
178 | * 1 when a packet was written into /p pkt, and more packets might be left; | |
179 | * <0 when not enough data was provided to return a full packet, or on error. | |
180 | */ | |
181 | static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf, | |
182 | AVStream *st, AVPacket *pkt, | |
183 | uint32_t *timestamp, | |
184 | const uint8_t *buf, int len, uint16_t seq, | |
185 | int flags) | |
186 | { | |
187 | AVIOContext *pb = &asf->pb; | |
188 | int res, mflags, len_off; | |
189 | RTSPState *rt = s->priv_data; | |
190 | ||
191 | if (!rt->asf_ctx) | |
192 | return -1; | |
193 | ||
194 | if (len > 0) { | |
195 | int off, out_len = 0; | |
196 | ||
197 | if (len < 4) | |
198 | return -1; | |
199 | ||
200 | av_freep(&asf->buf); | |
201 | ||
202 | ffio_init_context(pb, (uint8_t *)buf, len, 0, NULL, NULL, NULL, NULL); | |
203 | ||
204 | while (avio_tell(pb) + 4 < len) { | |
205 | int start_off = avio_tell(pb); | |
206 | ||
207 | mflags = avio_r8(pb); | |
208 | if (mflags & 0x80) | |
209 | flags |= RTP_FLAG_KEY; | |
210 | len_off = avio_rb24(pb); | |
211 | if (mflags & 0x20) /**< relative timestamp */ | |
212 | avio_skip(pb, 4); | |
213 | if (mflags & 0x10) /**< has duration */ | |
214 | avio_skip(pb, 4); | |
215 | if (mflags & 0x8) /**< has location ID */ | |
216 | avio_skip(pb, 4); | |
217 | off = avio_tell(pb); | |
218 | ||
219 | if (!(mflags & 0x40)) { | |
220 | /** | |
221 | * If 0x40 is not set, the len_off field specifies an offset | |
222 | * of this packet's payload data in the complete (reassembled) | |
223 | * ASF packet. This is used to spread one ASF packet over | |
224 | * multiple RTP packets. | |
225 | */ | |
226 | if (asf->pktbuf && len_off != avio_tell(asf->pktbuf)) { | |
227 | uint8_t *p; | |
228 | avio_close_dyn_buf(asf->pktbuf, &p); | |
229 | asf->pktbuf = NULL; | |
230 | av_free(p); | |
231 | } | |
232 | if (!len_off && !asf->pktbuf && | |
233 | (res = avio_open_dyn_buf(&asf->pktbuf)) < 0) | |
234 | return res; | |
235 | if (!asf->pktbuf) | |
236 | return AVERROR(EIO); | |
237 | ||
238 | avio_write(asf->pktbuf, buf + off, len - off); | |
239 | avio_skip(pb, len - off); | |
240 | if (!(flags & RTP_FLAG_MARKER)) | |
241 | return -1; | |
242 | out_len = avio_close_dyn_buf(asf->pktbuf, &asf->buf); | |
243 | asf->pktbuf = NULL; | |
244 | } else { | |
245 | /** | |
246 | * If 0x40 is set, the len_off field specifies the length of | |
247 | * the next ASF packet that can be read from this payload | |
248 | * data alone. This is commonly the same as the payload size, | |
249 | * but could be less in case of packet splitting (i.e. | |
250 | * multiple ASF packets in one RTP packet). | |
251 | */ | |
252 | ||
253 | int cur_len = start_off + len_off - off; | |
254 | int prev_len = out_len; | |
255 | out_len += cur_len; | |
256 | if (FFMIN(cur_len, len - off) < 0) | |
257 | return -1; | |
258 | if ((res = av_reallocp(&asf->buf, out_len)) < 0) | |
259 | return res; | |
260 | memcpy(asf->buf + prev_len, buf + off, | |
261 | FFMIN(cur_len, len - off)); | |
262 | avio_skip(pb, cur_len); | |
263 | } | |
264 | } | |
265 | ||
266 | init_packetizer(pb, asf->buf, out_len); | |
267 | pb->pos += rt->asf_pb_pos; | |
268 | pb->eof_reached = 0; | |
269 | rt->asf_ctx->pb = pb; | |
270 | } | |
271 | ||
272 | for (;;) { | |
273 | int i; | |
274 | ||
275 | res = ff_read_packet(rt->asf_ctx, pkt); | |
276 | rt->asf_pb_pos = avio_tell(pb); | |
277 | if (res != 0) | |
278 | break; | |
279 | for (i = 0; i < s->nb_streams; i++) { | |
280 | if (s->streams[i]->id == rt->asf_ctx->streams[pkt->stream_index]->id) { | |
281 | pkt->stream_index = i; | |
282 | return 1; // FIXME: return 0 if last packet | |
283 | } | |
284 | } | |
285 | av_free_packet(pkt); | |
286 | } | |
287 | ||
288 | return res == 1 ? -1 : res; | |
289 | } | |
290 | ||
291 | static PayloadContext *asfrtp_new_context(void) | |
292 | { | |
293 | return av_mallocz(sizeof(PayloadContext)); | |
294 | } | |
295 | ||
296 | static void asfrtp_free_context(PayloadContext *asf) | |
297 | { | |
298 | if (asf->pktbuf) { | |
299 | uint8_t *p = NULL; | |
300 | avio_close_dyn_buf(asf->pktbuf, &p); | |
301 | asf->pktbuf = NULL; | |
302 | av_free(p); | |
303 | } | |
304 | av_freep(&asf->buf); | |
305 | av_free(asf); | |
306 | } | |
307 | ||
308 | #define RTP_ASF_HANDLER(n, s, t) \ | |
309 | RTPDynamicProtocolHandler ff_ms_rtp_ ## n ## _handler = { \ | |
310 | .enc_name = s, \ | |
311 | .codec_type = t, \ | |
312 | .codec_id = AV_CODEC_ID_NONE, \ | |
313 | .parse_sdp_a_line = asfrtp_parse_sdp_line, \ | |
314 | .alloc = asfrtp_new_context, \ | |
315 | .free = asfrtp_free_context, \ | |
316 | .parse_packet = asfrtp_parse_packet, \ | |
317 | } | |
318 | ||
319 | RTP_ASF_HANDLER(asf_pfv, "x-asf-pf", AVMEDIA_TYPE_VIDEO); | |
320 | RTP_ASF_HANDLER(asf_pfa, "x-asf-pf", AVMEDIA_TYPE_AUDIO); |