62aee89e5004eb71699698e8a57dae4f6bf6dc7e
[libav.git] / libavformat / rtpdec_qt.c
1 /*
2 * RTP/Quicktime support.
3 * Copyright (c) 2009 Ronald S. Bultje
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 Quicktime-style RTP support
25 * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
26 */
27
28 #include "avformat.h"
29 #include "internal.h"
30 #include "avio_internal.h"
31 #include "rtp.h"
32 #include "rtpdec.h"
33 #include "isom.h"
34 #include "libavcodec/get_bits.h"
35
36 struct PayloadContext {
37 AVPacket pkt;
38 int bytes_per_frame, remaining;
39 uint32_t timestamp;
40 };
41
42 static int qt_rtp_parse_packet(AVFormatContext *s, PayloadContext *qt,
43 AVStream *st, AVPacket *pkt,
44 uint32_t *timestamp, const uint8_t *buf,
45 int len, uint16_t seq, int flags)
46 {
47 AVIOContext pb;
48 GetBitContext gb;
49 int packing_scheme, has_payload_desc, has_packet_info, alen,
50 has_marker_bit = flags & RTP_FLAG_MARKER,
51 keyframe;
52
53 if (qt->remaining) {
54 int num = qt->pkt.size / qt->bytes_per_frame;
55
56 if (av_new_packet(pkt, qt->bytes_per_frame))
57 return AVERROR(ENOMEM);
58 pkt->stream_index = st->index;
59 pkt->flags = qt->pkt.flags;
60 memcpy(pkt->data,
61 &qt->pkt.data[(num - qt->remaining) * qt->bytes_per_frame],
62 qt->bytes_per_frame);
63 if (--qt->remaining == 0) {
64 av_freep(&qt->pkt.data);
65 qt->pkt.size = 0;
66 }
67 return qt->remaining > 0;
68 }
69
70 /**
71 * The RTP payload is described in:
72 * http://developer.apple.com/quicktime/icefloe/dispatch026.html
73 */
74 init_get_bits(&gb, buf, len << 3);
75 ffio_init_context(&pb, buf, len, 0, NULL, NULL, NULL, NULL);
76
77 if (len < 4)
78 return AVERROR_INVALIDDATA;
79
80 skip_bits(&gb, 4); // version
81 if ((packing_scheme = get_bits(&gb, 2)) == 0)
82 return AVERROR_INVALIDDATA;
83 keyframe = get_bits1(&gb);
84 has_payload_desc = get_bits1(&gb);
85 has_packet_info = get_bits1(&gb);
86 skip_bits(&gb, 23); // reserved:7, cache payload info:1, payload ID:15
87
88 if (has_payload_desc) {
89 int data_len, pos, is_start, is_finish;
90 uint32_t tag;
91
92 pos = get_bits_count(&gb) >> 3;
93 if (pos + 12 > len)
94 return AVERROR_INVALIDDATA;
95
96 skip_bits(&gb, 2); // has non-I frames:1, is sparse:1
97 is_start = get_bits1(&gb);
98 is_finish = get_bits1(&gb);
99 if (!is_start || !is_finish) {
100 avpriv_request_sample(s, "RTP-X-QT with payload description "
101 "split over several packets");
102 return AVERROR_PATCHWELCOME;
103 }
104 skip_bits(&gb, 12); // reserved
105 data_len = get_bits(&gb, 16);
106
107 avio_seek(&pb, pos + 4, SEEK_SET);
108 tag = avio_rl32(&pb);
109 if ((st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
110 tag != MKTAG('v','i','d','e')) ||
111 (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
112 tag != MKTAG('s','o','u','n')))
113 return AVERROR_INVALIDDATA;
114 avpriv_set_pts_info(st, 32, 1, avio_rb32(&pb));
115
116 if (pos + data_len > len)
117 return AVERROR_INVALIDDATA;
118 /* TLVs */
119 while (avio_tell(&pb) + 4 < pos + data_len) {
120 int tlv_len = avio_rb16(&pb);
121 tag = avio_rl16(&pb);
122 if (avio_tell(&pb) + tlv_len > pos + data_len)
123 return AVERROR_INVALIDDATA;
124
125 #define MKTAG16(a,b) MKTAG(a,b,0,0)
126 switch (tag) {
127 case MKTAG16('s','d'): {
128 MOVStreamContext *msc;
129 void *priv_data = st->priv_data;
130 int nb_streams = s->nb_streams;
131 MOVContext *mc = av_mallocz(sizeof(*mc));
132 if (!mc)
133 return AVERROR(ENOMEM);
134 mc->fc = s;
135 st->priv_data = msc = av_mallocz(sizeof(MOVStreamContext));
136 if (!msc) {
137 av_free(mc);
138 st->priv_data = priv_data;
139 return AVERROR(ENOMEM);
140 }
141 /* ff_mov_read_stsd_entries updates stream s->nb_streams-1,
142 * so set it temporarily to indicate which stream to update. */
143 s->nb_streams = st->index + 1;
144 ff_mov_read_stsd_entries(mc, &pb, 1);
145 qt->bytes_per_frame = msc->bytes_per_frame;
146 av_free(msc);
147 av_free(mc);
148 st->priv_data = priv_data;
149 s->nb_streams = nb_streams;
150 break;
151 }
152 default:
153 avio_skip(&pb, tlv_len);
154 break;
155 }
156 }
157
158 /* 32-bit alignment */
159 avio_skip(&pb, ((avio_tell(&pb) + 3) & ~3) - avio_tell(&pb));
160 } else
161 avio_seek(&pb, 4, SEEK_SET);
162
163 if (has_packet_info) {
164 avpriv_request_sample(s, "RTP-X-QT with packet-specific info");
165 return AVERROR_PATCHWELCOME;
166 }
167
168 alen = len - avio_tell(&pb);
169 if (alen <= 0)
170 return AVERROR_INVALIDDATA;
171
172 switch (packing_scheme) {
173 case 3: /* one data packet spread over 1 or multiple RTP packets */
174 if (qt->pkt.size > 0 && qt->timestamp == *timestamp) {
175 int err;
176 if ((err = av_reallocp(&qt->pkt.data, qt->pkt.size + alen +
177 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
178 qt->pkt.size = 0;
179 return err;
180 }
181 } else {
182 av_freep(&qt->pkt.data);
183 av_init_packet(&qt->pkt);
184 qt->pkt.data = av_realloc(NULL, alen + FF_INPUT_BUFFER_PADDING_SIZE);
185 if (!qt->pkt.data)
186 return AVERROR(ENOMEM);
187 qt->pkt.size = 0;
188 qt->timestamp = *timestamp;
189 }
190 memcpy(qt->pkt.data + qt->pkt.size, buf + avio_tell(&pb), alen);
191 qt->pkt.size += alen;
192 if (has_marker_bit) {
193 int ret = av_packet_from_data(pkt, qt->pkt.data, qt->pkt.size);
194 if (ret < 0)
195 return ret;
196
197 qt->pkt.size = 0;
198 qt->pkt.data = NULL;
199 pkt->flags = keyframe ? AV_PKT_FLAG_KEY : 0;
200 pkt->stream_index = st->index;
201 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
202 return 0;
203 }
204 return AVERROR(EAGAIN);
205
206 case 1: /* constant packet size, multiple packets per RTP packet */
207 if (qt->bytes_per_frame == 0 ||
208 alen % qt->bytes_per_frame != 0)
209 return AVERROR_INVALIDDATA; /* wrongly padded */
210 qt->remaining = (alen / qt->bytes_per_frame) - 1;
211 if (av_new_packet(pkt, qt->bytes_per_frame))
212 return AVERROR(ENOMEM);
213 memcpy(pkt->data, buf + avio_tell(&pb), qt->bytes_per_frame);
214 pkt->flags = keyframe ? AV_PKT_FLAG_KEY : 0;
215 pkt->stream_index = st->index;
216 if (qt->remaining > 0) {
217 av_freep(&qt->pkt.data);
218 qt->pkt.data = av_realloc(NULL, qt->remaining * qt->bytes_per_frame);
219 if (!qt->pkt.data) {
220 av_free_packet(pkt);
221 return AVERROR(ENOMEM);
222 }
223 qt->pkt.size = qt->remaining * qt->bytes_per_frame;
224 memcpy(qt->pkt.data,
225 buf + avio_tell(&pb) + qt->bytes_per_frame,
226 qt->remaining * qt->bytes_per_frame);
227 qt->pkt.flags = pkt->flags;
228 return 1;
229 }
230 return 0;
231
232 default: /* unimplemented */
233 avpriv_request_sample(NULL, "RTP-X-QT with packing scheme 2");
234 return AVERROR_PATCHWELCOME;
235 }
236 }
237
238 static void qt_rtp_close(PayloadContext *qt)
239 {
240 av_freep(&qt->pkt.data);
241 }
242
243 #define RTP_QT_HANDLER(m, n, s, t) \
244 RTPDynamicProtocolHandler ff_ ## m ## _rtp_ ## n ## _handler = { \
245 .enc_name = s, \
246 .codec_type = t, \
247 .codec_id = AV_CODEC_ID_NONE, \
248 .priv_data_size = sizeof(PayloadContext), \
249 .close = qt_rtp_close, \
250 .parse_packet = qt_rtp_parse_packet, \
251 }
252
253 RTP_QT_HANDLER(qt, vid, "X-QT", AVMEDIA_TYPE_VIDEO);
254 RTP_QT_HANDLER(qt, aud, "X-QT", AVMEDIA_TYPE_AUDIO);
255 RTP_QT_HANDLER(quicktime, vid, "X-QUICKTIME", AVMEDIA_TYPE_VIDEO);
256 RTP_QT_HANDLER(quicktime, aud, "X-QUICKTIME", AVMEDIA_TYPE_AUDIO);