h264/aarch64: optimize neon loop filter
[libav.git] / libavformat / rtpdec_xiph.c
CommitLineData
887af2aa 1/*
96070b8b 2 * Xiph RTP Protocols
339f5f39 3 * Copyright (c) 2009 Colin McQuillian
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4 * Copyright (c) 2010 Josh Allmann
5 *
2912e87a 6 * This file is part of Libav.
887af2aa 7 *
2912e87a 8 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 13 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 19 * License along with Libav; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23/**
ba87f080 24 * @file
96070b8b 25 * @brief Xiph / RTP Code
339f5f39 26 * @author Colin McQuillan <m.niloc@gmail.com>
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27 * @author Josh Allmann <joshua.allmann@gmail.com>
28 */
29
7abd35a1 30#include "libavutil/attributes.h"
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31#include "libavutil/avstring.h"
32#include "libavutil/base64.h"
33#include "libavcodec/bytestream.h"
34
35#include <assert.h>
36
199fb402 37#include "avio_internal.h"
887af2aa 38#include "rtpdec.h"
965a3ddb 39#include "rtpdec_formats.h"
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40
41/**
96070b8b 42 * RTP/Xiph specific private data.
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43 */
44struct PayloadContext {
45 unsigned ident; ///< 24-bit stream configuration identifier
46 uint32_t timestamp;
ae628ec1 47 AVIOContext* fragment; ///< buffer for split payloads
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48 uint8_t *split_buf;
49 int split_pos, split_buf_len, split_buf_size;
50 int split_pkts;
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51};
52
d594dbec 53static void xiph_close_context(PayloadContext * data)
887af2aa 54{
199fb402 55 ffio_free_dyn_buf(&data->fragment);
504de2ec 56 av_free(data->split_buf);
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57}
58
c6f1dc8e 59
90c784cc
MS
60static int xiph_handle_packet(AVFormatContext *ctx, PayloadContext *data,
61 AVStream *st, AVPacket *pkt, uint32_t *timestamp,
62 const uint8_t *buf, int len, uint16_t seq,
63 int flags)
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64{
65
66 int ident, fragmented, tdt, num_pkts, pkt_len;
67
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68 if (!buf) {
69 if (!data->split_buf || data->split_pos + 2 > data->split_buf_len ||
70 data->split_pkts <= 0) {
71 av_log(ctx, AV_LOG_ERROR, "No more data to return\n");
72 return AVERROR_INVALIDDATA;
73 }
74 pkt_len = AV_RB16(data->split_buf + data->split_pos);
75 data->split_pos += 2;
76 if (data->split_pos + pkt_len > data->split_buf_len) {
77 av_log(ctx, AV_LOG_ERROR, "Not enough data to return\n");
78 return AVERROR_INVALIDDATA;
79 }
80 if (av_new_packet(pkt, pkt_len)) {
81 av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
82 return AVERROR(ENOMEM);
83 }
84 pkt->stream_index = st->index;
85 memcpy(pkt->data, data->split_buf + data->split_pos, pkt_len);
86 data->split_pos += pkt_len;
87 data->split_pkts--;
88 return data->split_pkts > 0;
89 }
90
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91 if (len < 6) {
92 av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
93 return AVERROR_INVALIDDATA;
94 }
95
96070b8b 96 // read xiph rtp headers
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97 ident = AV_RB24(buf);
98 fragmented = buf[3] >> 6;
99 tdt = (buf[3] >> 4) & 3;
737b3972 100 num_pkts = buf[3] & 0xf;
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101 pkt_len = AV_RB16(buf + 4);
102
103 if (pkt_len > len - 6) {
104 av_log(ctx, AV_LOG_ERROR,
105 "Invalid packet length %d in %d byte packet\n", pkt_len,
106 len);
107 return AVERROR_INVALIDDATA;
108 }
109
110 if (ident != data->ident) {
67deba8a 111 avpriv_report_missing_feature(ctx, "Xiph SDP configuration change");
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112 return AVERROR_PATCHWELCOME;
113 }
114
115 if (tdt) {
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DB
116 avpriv_report_missing_feature(ctx,
117 "RTP Xiph packet settings (%d,%d,%d)",
118 fragmented, tdt, num_pkts);
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119 return AVERROR_PATCHWELCOME;
120 }
121
122 buf += 6; // move past header bits
123 len -= 6;
124
125 if (fragmented == 0) {
504de2ec 126 if (av_new_packet(pkt, pkt_len)) {
887af2aa 127 av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
2874c81c 128 return AVERROR(ENOMEM);
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129 }
130 pkt->stream_index = st->index;
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131 memcpy(pkt->data, buf, pkt_len);
132 buf += pkt_len;
133 len -= pkt_len;
134 num_pkts--;
135
136 if (num_pkts > 0) {
137 if (len > data->split_buf_size || !data->split_buf) {
138 av_freep(&data->split_buf);
139 data->split_buf_size = 2 * len;
140 data->split_buf = av_malloc(data->split_buf_size);
141 if (!data->split_buf) {
142 av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
ce70f28a 143 av_packet_unref(pkt);
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144 return AVERROR(ENOMEM);
145 }
146 }
147 memcpy(data->split_buf, buf, len);
148 data->split_buf_len = len;
149 data->split_pos = 0;
150 data->split_pkts = num_pkts;
151 return 1;
887af2aa 152 }
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153
154 return 0;
155
156 } else if (fragmented == 1) {
96070b8b 157 // start of xiph data fragment
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158 int res;
159
160 // end packet has been lost somewhere, so drop buffered data
199fb402 161 ffio_free_dyn_buf(&data->fragment);
887af2aa 162
b92c5452 163 if((res = avio_open_dyn_buf(&data->fragment)) < 0)
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164 return res;
165
77eb5504 166 avio_write(data->fragment, buf, pkt_len);
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167 data->timestamp = *timestamp;
168
169 } else {
170 assert(fragmented < 4);
171 if (data->timestamp != *timestamp) {
172 // skip if fragmented timestamp is incorrect;
173 // a start packet has been lost somewhere
199fb402 174 ffio_free_dyn_buf(&data->fragment);
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175 av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n");
176 return AVERROR_INVALIDDATA;
177 }
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178 if (!data->fragment) {
179 av_log(ctx, AV_LOG_WARNING,
180 "Received packet without a start fragment; dropping.\n");
181 return AVERROR(EAGAIN);
182 }
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183
184 // copy data to fragment buffer
77eb5504 185 avio_write(data->fragment, buf, pkt_len);
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186
187 if (fragmented == 3) {
96070b8b 188 // end of xiph data packet
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189 int ret = ff_rtp_finalize_packet(pkt, &data->fragment, st->index);
190 if (ret < 0) {
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191 av_log(ctx, AV_LOG_ERROR,
192 "Error occurred when getting fragment buffer.");
179a5c37 193 return ret;
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194 }
195
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196 return 0;
197 }
198 }
199
200 return AVERROR(EAGAIN);
201}
202
203/**
204 * Length encoding described in RFC5215 section 3.1.1.
205 */
206static int get_base128(const uint8_t ** buf, const uint8_t * buf_end)
207{
208 int n = 0;
209 for (; *buf < buf_end; ++*buf) {
210 n <<= 7;
211 n += **buf & 0x7f;
212 if (!(**buf & 0x80)) {
213 ++*buf;
214 return n;
215 }
216 }
217 return 0;
218}
219
220/**
221 * Based off parse_packed_headers in Vorbis RTP
222 */
0a7005be 223static int
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224parse_packed_headers(AVFormatContext *s,
225 const uint8_t * packed_headers,
887af2aa 226 const uint8_t * packed_headers_end,
9200514a 227 AVCodecParameters *par, PayloadContext * xiph_data)
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228{
229
230 unsigned num_packed, num_headers, length, length1, length2, extradata_alloc;
231 uint8_t *ptr;
232
233 if (packed_headers_end - packed_headers < 9) {
9200514a 234 av_log(s, AV_LOG_ERROR,
461628c6 235 "Invalid %td byte packed header.",
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236 packed_headers_end - packed_headers);
237 return AVERROR_INVALIDDATA;
238 }
239
240 num_packed = bytestream_get_be32(&packed_headers);
96070b8b 241 xiph_data->ident = bytestream_get_be24(&packed_headers);
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242 length = bytestream_get_be16(&packed_headers);
243 num_headers = get_base128(&packed_headers, packed_headers_end);
244 length1 = get_base128(&packed_headers, packed_headers_end);
245 length2 = get_base128(&packed_headers, packed_headers_end);
246
247 if (num_packed != 1 || num_headers > 3) {
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248 avpriv_report_missing_feature(s, "%u packed headers, %u headers",
249 num_packed, num_headers);
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250 return AVERROR_PATCHWELCOME;
251 }
252
253 if (packed_headers_end - packed_headers != length ||
254 length1 > length || length2 > length - length1) {
9200514a 255 av_log(s, AV_LOG_ERROR,
1263b203 256 "Bad packed header lengths (%u,%u,%td,%u)\n", length1,
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257 length2, packed_headers_end - packed_headers, length);
258 return AVERROR_INVALIDDATA;
259 }
260
261 /* allocate extra space:
262 * -- length/255 +2 for xiphlacing
263 * -- one for the '2' marker
059a9348
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264 * -- AV_INPUT_BUFFER_PADDING_SIZE required */
265 extradata_alloc = length + length/255 + 3 + AV_INPUT_BUFFER_PADDING_SIZE;
887af2aa 266
9200514a 267 ptr = par->extradata = av_malloc(extradata_alloc);
887af2aa 268 if (!ptr) {
9200514a 269 av_log(s, AV_LOG_ERROR, "Out of memory\n");
2874c81c 270 return AVERROR(ENOMEM);
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271 }
272 *ptr++ = 2;
273 ptr += av_xiphlacing(ptr, length1);
274 ptr += av_xiphlacing(ptr, length2);
275 memcpy(ptr, packed_headers, length);
276 ptr += length;
9200514a 277 par->extradata_size = ptr - par->extradata;
887af2aa 278 // clear out remaining parts of the buffer
9200514a 279 memset(ptr, 0, extradata_alloc - par->extradata_size);
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280
281 return 0;
282}
283
0307cc22
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284static int xiph_parse_fmtp_pair(AVFormatContext *s,
285 AVStream* stream,
96070b8b 286 PayloadContext *xiph_data,
ec96a89c 287 const char *attr, const char *value)
887af2aa 288{
9200514a 289 AVCodecParameters *par = stream->codecpar;
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290 int result = 0;
291
292 if (!strcmp(attr, "sampling")) {
42c63263 293 if (!strcmp(value, "YCbCr-4:2:0")) {
9200514a 294 par->format = AV_PIX_FMT_YUV420P;
42c63263 295 } else if (!strcmp(value, "YCbCr-4:4:2")) {
9200514a 296 par->format = AV_PIX_FMT_YUV422P;
42c63263 297 } else if (!strcmp(value, "YCbCr-4:4:4")) {
9200514a 298 par->format = AV_PIX_FMT_YUV444P;
42c63263 299 } else {
0307cc22 300 av_log(s, AV_LOG_ERROR,
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301 "Unsupported pixel format %s\n", attr);
302 return AVERROR_INVALIDDATA;
303 }
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304 } else if (!strcmp(attr, "width")) {
305 /* This is an integer between 1 and 1048561
306 * and MUST be in multiples of 16. */
9200514a 307 par->width = atoi(value);
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308 return 0;
309 } else if (!strcmp(attr, "height")) {
310 /* This is an integer between 1 and 1048561
311 * and MUST be in multiples of 16. */
9200514a 312 par->height = atoi(value);
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313 return 0;
314 } else if (!strcmp(attr, "delivery-method")) {
315 /* Possible values are: inline, in_band, out_band/specific_name. */
316 return AVERROR_PATCHWELCOME;
317 } else if (!strcmp(attr, "configuration-uri")) {
318 /* NOTE: configuration-uri is supported only under 2 conditions:
319 *--after the delivery-method tag
320 * --with a delivery-method value of out_band */
321 return AVERROR_PATCHWELCOME;
322 } else if (!strcmp(attr, "configuration")) {
323 /* NOTE: configuration is supported only AFTER the delivery-method tag
324 * The configuration value is a base64 encoded packed header */
325 uint8_t *decoded_packet = NULL;
326 int packet_size;
327 size_t decoded_alloc = strlen(value) / 4 * 3 + 4;
328
329 if (decoded_alloc <= INT_MAX) {
330 decoded_packet = av_malloc(decoded_alloc);
331 if (decoded_packet) {
332 packet_size =
333 av_base64_decode(decoded_packet, value, decoded_alloc);
334
335 result = parse_packed_headers
9200514a 336 (s, decoded_packet, decoded_packet + packet_size, par,
96070b8b 337 xiph_data);
887af2aa 338 } else {
0307cc22 339 av_log(s, AV_LOG_ERROR,
887af2aa 340 "Out of memory while decoding SDP configuration.\n");
2874c81c 341 result = AVERROR(ENOMEM);
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342 }
343 } else {
0307cc22 344 av_log(s, AV_LOG_ERROR, "Packet too large\n");
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345 result = AVERROR_INVALIDDATA;
346 }
347 av_free(decoded_packet);
348 }
349 return result;
350}
351
96070b8b 352static int xiph_parse_sdp_line(AVFormatContext *s, int st_index,
2ce7f4d4 353 PayloadContext *data, const char *line)
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354{
355 const char *p;
887af2aa 356
45600148
MS
357 if (st_index < 0)
358 return 0;
359
887af2aa 360 if (av_strstart(line, "fmtp:", &p)) {
0307cc22 361 return ff_parse_fmtp(s, s->streams[st_index], data, p,
af1308f0 362 xiph_parse_fmtp_pair);
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363 }
364
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365 return 0;
366}
367
368RTPDynamicProtocolHandler ff_theora_dynamic_handler = {
369 .enc_name = "theora",
72415b2a 370 .codec_type = AVMEDIA_TYPE_VIDEO,
36ef5369 371 .codec_id = AV_CODEC_ID_THEORA,
5d8cae45 372 .priv_data_size = sizeof(PayloadContext),
96070b8b 373 .parse_sdp_a_line = xiph_parse_sdp_line,
d594dbec 374 .close = xiph_close_context,
3cd5828f 375 .parse_packet = xiph_handle_packet,
887af2aa 376};
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377
378RTPDynamicProtocolHandler ff_vorbis_dynamic_handler = {
379 .enc_name = "vorbis",
4bebf2cf 380 .codec_type = AVMEDIA_TYPE_AUDIO,
36ef5369 381 .codec_id = AV_CODEC_ID_VORBIS,
2b982e92 382 .need_parsing = AVSTREAM_PARSE_HEADERS,
5d8cae45 383 .priv_data_size = sizeof(PayloadContext),
339f5f39 384 .parse_sdp_a_line = xiph_parse_sdp_line,
d594dbec 385 .close = xiph_close_context,
3cd5828f 386 .parse_packet = xiph_handle_packet,
339f5f39 387};