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1 | /* |
2 | * Common code for the RTP depacketization of MPEG-4 formats. | |
3 | * Copyright (c) 2010 Fabrice Bellard | |
4 | * Romain Degez | |
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 MPEG4 / RTP Code | |
26 | * @author Fabrice Bellard | |
27 | * @author Romain Degez | |
28 | */ | |
29 | ||
30 | #include "rtpdec_formats.h" | |
31 | #include "internal.h" | |
32 | #include "libavutil/attributes.h" | |
33 | #include "libavutil/avstring.h" | |
34 | #include "libavcodec/get_bits.h" | |
35 | ||
36 | /** Structure listing useful vars to parse RTP packet payload */ | |
37 | struct PayloadContext { | |
38 | int sizelength; | |
39 | int indexlength; | |
40 | int indexdeltalength; | |
41 | int profile_level_id; | |
42 | int streamtype; | |
43 | int objecttype; | |
44 | char *mode; | |
45 | ||
46 | /** mpeg 4 AU headers */ | |
47 | struct AUHeaders { | |
48 | int size; | |
49 | int index; | |
50 | int cts_flag; | |
51 | int cts; | |
52 | int dts_flag; | |
53 | int dts; | |
54 | int rap_flag; | |
55 | int streamstate; | |
56 | } *au_headers; | |
57 | int au_headers_allocated; | |
58 | int nb_au_headers; | |
59 | int au_headers_length_bytes; | |
60 | int cur_au_index; | |
61 | ||
62 | uint8_t buf[RTP_MAX_PACKET_LENGTH]; | |
63 | int buf_pos, buf_size; | |
64 | }; | |
65 | ||
66 | typedef struct { | |
67 | const char *str; | |
68 | uint16_t type; | |
69 | uint32_t offset; | |
70 | } AttrNameMap; | |
71 | ||
72 | /* All known fmtp parameters and the corresponding RTPAttrTypeEnum */ | |
73 | #define ATTR_NAME_TYPE_INT 0 | |
74 | #define ATTR_NAME_TYPE_STR 1 | |
75 | static const AttrNameMap attr_names[] = { | |
76 | { "SizeLength", ATTR_NAME_TYPE_INT, | |
77 | offsetof(PayloadContext, sizelength) }, | |
78 | { "IndexLength", ATTR_NAME_TYPE_INT, | |
79 | offsetof(PayloadContext, indexlength) }, | |
80 | { "IndexDeltaLength", ATTR_NAME_TYPE_INT, | |
81 | offsetof(PayloadContext, indexdeltalength) }, | |
82 | { "profile-level-id", ATTR_NAME_TYPE_INT, | |
83 | offsetof(PayloadContext, profile_level_id) }, | |
84 | { "StreamType", ATTR_NAME_TYPE_INT, | |
85 | offsetof(PayloadContext, streamtype) }, | |
86 | { "mode", ATTR_NAME_TYPE_STR, | |
87 | offsetof(PayloadContext, mode) }, | |
88 | { NULL, -1, -1 }, | |
89 | }; | |
90 | ||
91 | static PayloadContext *new_context(void) | |
92 | { | |
93 | return av_mallocz(sizeof(PayloadContext)); | |
94 | } | |
95 | ||
96 | static void free_context(PayloadContext *data) | |
97 | { | |
98 | av_free(data->au_headers); | |
99 | av_free(data->mode); | |
100 | av_free(data); | |
101 | } | |
102 | ||
103 | static int parse_fmtp_config(AVCodecContext *codec, char *value) | |
104 | { | |
105 | /* decode the hexa encoded parameter */ | |
106 | int len = ff_hex_to_data(NULL, value); | |
107 | av_free(codec->extradata); | |
108 | if (ff_alloc_extradata(codec, len)) | |
109 | return AVERROR(ENOMEM); | |
110 | ff_hex_to_data(codec->extradata, value); | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int rtp_parse_mp4_au(PayloadContext *data, const uint8_t *buf, int len) | |
115 | { | |
116 | int au_headers_length, au_header_size, i; | |
117 | GetBitContext getbitcontext; | |
118 | ||
119 | if (len < 2) | |
120 | return AVERROR_INVALIDDATA; | |
121 | ||
122 | /* decode the first 2 bytes where the AUHeader sections are stored | |
123 | length in bits */ | |
124 | au_headers_length = AV_RB16(buf); | |
125 | ||
126 | if (au_headers_length > RTP_MAX_PACKET_LENGTH) | |
127 | return -1; | |
128 | ||
129 | data->au_headers_length_bytes = (au_headers_length + 7) / 8; | |
130 | ||
131 | /* skip AU headers length section (2 bytes) */ | |
132 | buf += 2; | |
133 | len -= 2; | |
134 | ||
135 | if (len < data->au_headers_length_bytes) | |
136 | return AVERROR_INVALIDDATA; | |
137 | ||
138 | init_get_bits(&getbitcontext, buf, data->au_headers_length_bytes * 8); | |
139 | ||
140 | /* XXX: Wrong if optional additional sections are present (cts, dts etc...) */ | |
141 | au_header_size = data->sizelength + data->indexlength; | |
142 | if (au_header_size <= 0 || (au_headers_length % au_header_size != 0)) | |
143 | return -1; | |
144 | ||
145 | data->nb_au_headers = au_headers_length / au_header_size; | |
146 | if (!data->au_headers || data->au_headers_allocated < data->nb_au_headers) { | |
147 | av_free(data->au_headers); | |
148 | data->au_headers = av_malloc(sizeof(struct AUHeaders) * data->nb_au_headers); | |
149 | if (!data->au_headers) | |
150 | return AVERROR(ENOMEM); | |
151 | data->au_headers_allocated = data->nb_au_headers; | |
152 | } | |
153 | ||
154 | for (i = 0; i < data->nb_au_headers; ++i) { | |
155 | data->au_headers[i].size = get_bits_long(&getbitcontext, data->sizelength); | |
156 | data->au_headers[i].index = get_bits_long(&getbitcontext, data->indexlength); | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | ||
163 | /* Follows RFC 3640 */ | |
164 | static int aac_parse_packet(AVFormatContext *ctx, PayloadContext *data, | |
165 | AVStream *st, AVPacket *pkt, uint32_t *timestamp, | |
166 | const uint8_t *buf, int len, uint16_t seq, | |
167 | int flags) | |
168 | { | |
169 | int ret; | |
170 | ||
171 | if (!buf) { | |
172 | if (data->cur_au_index > data->nb_au_headers) | |
173 | return AVERROR_INVALIDDATA; | |
174 | if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size) | |
175 | return AVERROR_INVALIDDATA; | |
176 | if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0) | |
177 | return ret; | |
178 | memcpy(pkt->data, &data->buf[data->buf_pos], data->au_headers[data->cur_au_index].size); | |
179 | data->buf_pos += data->au_headers[data->cur_au_index].size; | |
180 | pkt->stream_index = st->index; | |
181 | data->cur_au_index++; | |
182 | return data->cur_au_index < data->nb_au_headers; | |
183 | } | |
184 | ||
185 | if (rtp_parse_mp4_au(data, buf, len)) | |
186 | return -1; | |
187 | ||
188 | buf += data->au_headers_length_bytes + 2; | |
189 | len -= data->au_headers_length_bytes + 2; | |
190 | ||
191 | if (len < data->au_headers[0].size) | |
192 | return AVERROR_INVALIDDATA; | |
193 | if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0) | |
194 | return ret; | |
195 | memcpy(pkt->data, buf, data->au_headers[0].size); | |
196 | len -= data->au_headers[0].size; | |
197 | buf += data->au_headers[0].size; | |
198 | pkt->stream_index = st->index; | |
199 | ||
200 | if (len > 0 && data->nb_au_headers > 1) { | |
201 | data->buf_size = FFMIN(len, sizeof(data->buf)); | |
202 | memcpy(data->buf, buf, data->buf_size); | |
203 | data->cur_au_index = 1; | |
204 | data->buf_pos = 0; | |
205 | return 1; | |
206 | } | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static int parse_fmtp(AVFormatContext *s, | |
212 | AVStream *stream, PayloadContext *data, | |
213 | char *attr, char *value) | |
214 | { | |
215 | AVCodecContext *codec = stream->codec; | |
216 | int res, i; | |
217 | ||
218 | if (!strcmp(attr, "config")) { | |
219 | res = parse_fmtp_config(codec, value); | |
220 | ||
221 | if (res < 0) | |
222 | return res; | |
223 | } | |
224 | ||
225 | if (codec->codec_id == AV_CODEC_ID_AAC) { | |
226 | /* Looking for a known attribute */ | |
227 | for (i = 0; attr_names[i].str; ++i) { | |
228 | if (!av_strcasecmp(attr, attr_names[i].str)) { | |
229 | if (attr_names[i].type == ATTR_NAME_TYPE_INT) { | |
230 | *(int *)((char *)data+ | |
231 | attr_names[i].offset) = atoi(value); | |
232 | } else if (attr_names[i].type == ATTR_NAME_TYPE_STR) | |
233 | *(char **)((char *)data+ | |
234 | attr_names[i].offset) = av_strdup(value); | |
235 | } | |
236 | } | |
237 | } | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static int parse_sdp_line(AVFormatContext *s, int st_index, | |
242 | PayloadContext *data, const char *line) | |
243 | { | |
244 | const char *p; | |
245 | ||
246 | if (st_index < 0) | |
247 | return 0; | |
248 | ||
249 | if (av_strstart(line, "fmtp:", &p)) | |
250 | return ff_parse_fmtp(s, s->streams[st_index], data, p, parse_fmtp); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static av_cold int init_video(AVFormatContext *s, int st_index, | |
256 | PayloadContext *data) | |
257 | { | |
258 | if (st_index < 0) | |
259 | return 0; | |
260 | s->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL; | |
261 | return 0; | |
262 | } | |
263 | ||
264 | RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = { | |
265 | .enc_name = "MP4V-ES", | |
266 | .codec_type = AVMEDIA_TYPE_VIDEO, | |
267 | .codec_id = AV_CODEC_ID_MPEG4, | |
268 | .init = init_video, | |
269 | .parse_sdp_a_line = parse_sdp_line, | |
270 | }; | |
271 | ||
272 | RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = { | |
273 | .enc_name = "mpeg4-generic", | |
274 | .codec_type = AVMEDIA_TYPE_AUDIO, | |
275 | .codec_id = AV_CODEC_ID_AAC, | |
276 | .parse_sdp_a_line = parse_sdp_line, | |
277 | .alloc = new_context, | |
278 | .free = free_context, | |
279 | .parse_packet = aac_parse_packet | |
280 | }; |