Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / rtpdec_xiph.c
... / ...
CommitLineData
1/*
2 * Xiph RTP Protocols
3 * Copyright (c) 2009 Colin McQuillian
4 * Copyright (c) 2010 Josh Allmann
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
24 * @file
25 * @brief Xiph / RTP Code
26 * @author Colin McQuillan <m.niloc@gmail.com>
27 * @author Josh Allmann <joshua.allmann@gmail.com>
28 */
29
30#include "libavutil/attributes.h"
31#include "libavutil/avassert.h"
32#include "libavutil/avstring.h"
33#include "libavutil/base64.h"
34#include "libavcodec/bytestream.h"
35
36#include "internal.h"
37#include "rtpdec.h"
38#include "rtpdec_formats.h"
39
40/**
41 * RTP/Xiph specific private data.
42 */
43struct PayloadContext {
44 unsigned ident; ///< 24-bit stream configuration identifier
45 uint32_t timestamp;
46 AVIOContext* fragment; ///< buffer for split payloads
47 uint8_t *split_buf;
48 int split_pos, split_buf_len, split_buf_size;
49 int split_pkts;
50};
51
52static PayloadContext *xiph_new_context(void)
53{
54 return av_mallocz(sizeof(PayloadContext));
55}
56
57static inline void free_fragment_if_needed(PayloadContext * data)
58{
59 if (data->fragment) {
60 uint8_t* p;
61 avio_close_dyn_buf(data->fragment, &p);
62 av_free(p);
63 data->fragment = NULL;
64 }
65}
66
67static void xiph_free_context(PayloadContext * data)
68{
69 free_fragment_if_needed(data);
70 av_free(data->split_buf);
71 av_free(data);
72}
73
74static av_cold int xiph_vorbis_init(AVFormatContext *ctx, int st_index,
75 PayloadContext *data)
76{
77 if (st_index < 0)
78 return 0;
79 ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_HEADERS;
80 return 0;
81}
82
83
84static int xiph_handle_packet(AVFormatContext *ctx, PayloadContext *data,
85 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
86 const uint8_t *buf, int len, uint16_t seq,
87 int flags)
88{
89
90 int ident, fragmented, tdt, num_pkts, pkt_len;
91
92 if (!buf) {
93 if (!data->split_buf || data->split_pos + 2 > data->split_buf_len ||
94 data->split_pkts <= 0) {
95 av_log(ctx, AV_LOG_ERROR, "No more data to return\n");
96 return AVERROR_INVALIDDATA;
97 }
98 pkt_len = AV_RB16(data->split_buf + data->split_pos);
99 data->split_pos += 2;
100 if (data->split_pos + pkt_len > data->split_buf_len) {
101 av_log(ctx, AV_LOG_ERROR, "Not enough data to return\n");
102 return AVERROR_INVALIDDATA;
103 }
104 if (av_new_packet(pkt, pkt_len)) {
105 av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
106 return AVERROR(ENOMEM);
107 }
108 pkt->stream_index = st->index;
109 memcpy(pkt->data, data->split_buf + data->split_pos, pkt_len);
110 data->split_pos += pkt_len;
111 data->split_pkts--;
112 return data->split_pkts > 0;
113 }
114
115 if (len < 6) {
116 av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
117 return AVERROR_INVALIDDATA;
118 }
119
120 // read xiph rtp headers
121 ident = AV_RB24(buf);
122 fragmented = buf[3] >> 6;
123 tdt = (buf[3] >> 4) & 3;
124 num_pkts = buf[3] & 0xf;
125 pkt_len = AV_RB16(buf + 4);
126
127 if (pkt_len > len - 6) {
128 av_log(ctx, AV_LOG_ERROR,
129 "Invalid packet length %d in %d byte packet\n", pkt_len,
130 len);
131 return AVERROR_INVALIDDATA;
132 }
133
134 if (ident != data->ident) {
135 av_log(ctx, AV_LOG_ERROR,
136 "Unimplemented Xiph SDP configuration change detected\n");
137 return AVERROR_PATCHWELCOME;
138 }
139
140 if (tdt) {
141 av_log(ctx, AV_LOG_ERROR,
142 "Unimplemented RTP Xiph packet settings (%d,%d,%d)\n",
143 fragmented, tdt, num_pkts);
144 return AVERROR_PATCHWELCOME;
145 }
146
147 buf += 6; // move past header bits
148 len -= 6;
149
150 if (fragmented == 0) {
151 if (av_new_packet(pkt, pkt_len)) {
152 av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
153 return AVERROR(ENOMEM);
154 }
155 pkt->stream_index = st->index;
156 memcpy(pkt->data, buf, pkt_len);
157 buf += pkt_len;
158 len -= pkt_len;
159 num_pkts--;
160
161 if (num_pkts > 0) {
162 if (len > data->split_buf_size || !data->split_buf) {
163 av_freep(&data->split_buf);
164 data->split_buf_size = 2 * len;
165 data->split_buf = av_malloc(data->split_buf_size);
166 if (!data->split_buf) {
167 av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
168 av_free_packet(pkt);
169 return AVERROR(ENOMEM);
170 }
171 }
172 memcpy(data->split_buf, buf, len);
173 data->split_buf_len = len;
174 data->split_pos = 0;
175 data->split_pkts = num_pkts;
176 return 1;
177 }
178
179 return 0;
180
181 } else if (fragmented == 1) {
182 // start of xiph data fragment
183 int res;
184
185 // end packet has been lost somewhere, so drop buffered data
186 free_fragment_if_needed(data);
187
188 if((res = avio_open_dyn_buf(&data->fragment)) < 0)
189 return res;
190
191 avio_write(data->fragment, buf, pkt_len);
192 data->timestamp = *timestamp;
193
194 } else {
195 av_assert1(fragmented < 4);
196 if (data->timestamp != *timestamp) {
197 // skip if fragmented timestamp is incorrect;
198 // a start packet has been lost somewhere
199 free_fragment_if_needed(data);
200 av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n");
201 return AVERROR_INVALIDDATA;
202 }
203 if (!data->fragment) {
204 av_log(ctx, AV_LOG_WARNING,
205 "Received packet without a start fragment; dropping.\n");
206 return AVERROR(EAGAIN);
207 }
208
209 // copy data to fragment buffer
210 avio_write(data->fragment, buf, pkt_len);
211
212 if (fragmented == 3) {
213 // end of xiph data packet
214 int ret = ff_rtp_finalize_packet(pkt, &data->fragment, st->index);
215 if (ret < 0) {
216 av_log(ctx, AV_LOG_ERROR,
217 "Error occurred when getting fragment buffer.");
218 return ret;
219 }
220
221 return 0;
222 }
223 }
224
225 return AVERROR(EAGAIN);
226}
227
228/**
229 * Length encoding described in RFC5215 section 3.1.1.
230 */
231static int get_base128(const uint8_t ** buf, const uint8_t * buf_end)
232{
233 int n = 0;
234 for (; *buf < buf_end; ++*buf) {
235 n <<= 7;
236 n += **buf & 0x7f;
237 if (!(**buf & 0x80)) {
238 ++*buf;
239 return n;
240 }
241 }
242 return 0;
243}
244
245/**
246 * Based off parse_packed_headers in Vorbis RTP
247 */
248static int
249parse_packed_headers(const uint8_t * packed_headers,
250 const uint8_t * packed_headers_end,
251 AVCodecContext * codec, PayloadContext * xiph_data)
252{
253
254 unsigned num_packed, num_headers, length, length1, length2, extradata_alloc;
255 uint8_t *ptr;
256
257 if (packed_headers_end - packed_headers < 9) {
258 av_log(codec, AV_LOG_ERROR,
259 "Invalid %"PTRDIFF_SPECIFIER" byte packed header.",
260 packed_headers_end - packed_headers);
261 return AVERROR_INVALIDDATA;
262 }
263
264 num_packed = bytestream_get_be32(&packed_headers);
265 xiph_data->ident = bytestream_get_be24(&packed_headers);
266 length = bytestream_get_be16(&packed_headers);
267 num_headers = get_base128(&packed_headers, packed_headers_end);
268 length1 = get_base128(&packed_headers, packed_headers_end);
269 length2 = get_base128(&packed_headers, packed_headers_end);
270
271 if (num_packed != 1 || num_headers > 3) {
272 av_log(codec, AV_LOG_ERROR,
273 "Unimplemented number of headers: %d packed headers, %d headers\n",
274 num_packed, num_headers);
275 return AVERROR_PATCHWELCOME;
276 }
277
278 if (packed_headers_end - packed_headers != length ||
279 length1 > length || length2 > length - length1) {
280 av_log(codec, AV_LOG_ERROR,
281 "Bad packed header lengths (%d,%d,%"PTRDIFF_SPECIFIER",%d)\n", length1,
282 length2, packed_headers_end - packed_headers, length);
283 return AVERROR_INVALIDDATA;
284 }
285
286 /* allocate extra space:
287 * -- length/255 +2 for xiphlacing
288 * -- one for the '2' marker
289 * -- FF_INPUT_BUFFER_PADDING_SIZE required */
290 extradata_alloc = length + length/255 + 3 + FF_INPUT_BUFFER_PADDING_SIZE;
291
292 if (ff_alloc_extradata(codec, extradata_alloc)) {
293 av_log(codec, AV_LOG_ERROR, "Out of memory\n");
294 return AVERROR(ENOMEM);
295 }
296 ptr = codec->extradata;
297 *ptr++ = 2;
298 ptr += av_xiphlacing(ptr, length1);
299 ptr += av_xiphlacing(ptr, length2);
300 memcpy(ptr, packed_headers, length);
301 ptr += length;
302 codec->extradata_size = ptr - codec->extradata;
303 // clear out remaining parts of the buffer
304 memset(ptr, 0, extradata_alloc - codec->extradata_size);
305
306 return 0;
307}
308
309static int xiph_parse_fmtp_pair(AVFormatContext *s,
310 AVStream* stream,
311 PayloadContext *xiph_data,
312 char *attr, char *value)
313{
314 AVCodecContext *codec = stream->codec;
315 int result = 0;
316
317 if (!strcmp(attr, "sampling")) {
318 if (!strcmp(value, "YCbCr-4:2:0")) {
319 codec->pix_fmt = AV_PIX_FMT_YUV420P;
320 } else if (!strcmp(value, "YCbCr-4:4:2")) {
321 codec->pix_fmt = AV_PIX_FMT_YUV422P;
322 } else if (!strcmp(value, "YCbCr-4:4:4")) {
323 codec->pix_fmt = AV_PIX_FMT_YUV444P;
324 } else {
325 av_log(s, AV_LOG_ERROR,
326 "Unsupported pixel format %s\n", attr);
327 return AVERROR_INVALIDDATA;
328 }
329 } else if (!strcmp(attr, "width")) {
330 /* This is an integer between 1 and 1048561
331 * and MUST be in multiples of 16. */
332 codec->width = atoi(value);
333 return 0;
334 } else if (!strcmp(attr, "height")) {
335 /* This is an integer between 1 and 1048561
336 * and MUST be in multiples of 16. */
337 codec->height = atoi(value);
338 return 0;
339 } else if (!strcmp(attr, "delivery-method")) {
340 /* Possible values are: inline, in_band, out_band/specific_name. */
341 return AVERROR_PATCHWELCOME;
342 } else if (!strcmp(attr, "configuration-uri")) {
343 /* NOTE: configuration-uri is supported only under 2 conditions:
344 *--after the delivery-method tag
345 * --with a delivery-method value of out_band */
346 return AVERROR_PATCHWELCOME;
347 } else if (!strcmp(attr, "configuration")) {
348 /* NOTE: configuration is supported only AFTER the delivery-method tag
349 * The configuration value is a base64 encoded packed header */
350 uint8_t *decoded_packet = NULL;
351 int packet_size;
352 size_t decoded_alloc = strlen(value) / 4 * 3 + 4;
353
354 if (decoded_alloc <= INT_MAX) {
355 decoded_packet = av_malloc(decoded_alloc);
356 if (decoded_packet) {
357 packet_size =
358 av_base64_decode(decoded_packet, value, decoded_alloc);
359
360 result = parse_packed_headers
361 (decoded_packet, decoded_packet + packet_size, codec,
362 xiph_data);
363 } else {
364 av_log(s, AV_LOG_ERROR,
365 "Out of memory while decoding SDP configuration.\n");
366 result = AVERROR(ENOMEM);
367 }
368 } else {
369 av_log(s, AV_LOG_ERROR, "Packet too large\n");
370 result = AVERROR_INVALIDDATA;
371 }
372 av_free(decoded_packet);
373 }
374 return result;
375}
376
377static int xiph_parse_sdp_line(AVFormatContext *s, int st_index,
378 PayloadContext *data, const char *line)
379{
380 const char *p;
381
382 if (st_index < 0)
383 return 0;
384
385 if (av_strstart(line, "fmtp:", &p)) {
386 return ff_parse_fmtp(s, s->streams[st_index], data, p,
387 xiph_parse_fmtp_pair);
388 }
389
390 return 0;
391}
392
393RTPDynamicProtocolHandler ff_theora_dynamic_handler = {
394 .enc_name = "theora",
395 .codec_type = AVMEDIA_TYPE_VIDEO,
396 .codec_id = AV_CODEC_ID_THEORA,
397 .parse_sdp_a_line = xiph_parse_sdp_line,
398 .alloc = xiph_new_context,
399 .free = xiph_free_context,
400 .parse_packet = xiph_handle_packet
401};
402
403RTPDynamicProtocolHandler ff_vorbis_dynamic_handler = {
404 .enc_name = "vorbis",
405 .codec_type = AVMEDIA_TYPE_AUDIO,
406 .codec_id = AV_CODEC_ID_VORBIS,
407 .init = xiph_vorbis_init,
408 .parse_sdp_a_line = xiph_parse_sdp_line,
409 .alloc = xiph_new_context,
410 .free = xiph_free_context,
411 .parse_packet = xiph_handle_packet
412};