2 * RTP/Quicktime support.
3 * Copyright (c) 2009 Ronald S. Bultje
5 * This file is part of FFmpeg.
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.
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.
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
24 * @brief Quicktime-style RTP support
25 * @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
29 #include "avio_internal.h"
33 #include "libavcodec/get_bits.h"
35 struct PayloadContext {
37 int bytes_per_frame, remaining;
41 static int qt_rtp_parse_packet(AVFormatContext *s, PayloadContext *qt,
42 AVStream *st, AVPacket *pkt,
43 uint32_t *timestamp, const uint8_t *buf,
48 int packing_scheme, has_payload_desc, has_packet_info, alen,
49 has_marker_bit = flags & RTP_FLAG_MARKER;
52 int num = qt->pkt.size / qt->bytes_per_frame;
54 if (av_new_packet(pkt, qt->bytes_per_frame))
55 return AVERROR(ENOMEM);
56 pkt->stream_index = st->index;
57 pkt->flags = qt->pkt.flags;
59 &qt->pkt.data[(num - qt->remaining) * qt->bytes_per_frame],
61 if (--qt->remaining == 0) {
62 av_freep(&qt->pkt.data);
65 return qt->remaining > 0;
69 * The RTP payload is described in:
70 * http://developer.apple.com/quicktime/icefloe/dispatch026.html
72 init_get_bits(&gb, buf, len << 3);
73 ffio_init_context(&pb, buf, len, 0, NULL, NULL, NULL, NULL);
76 return AVERROR_INVALIDDATA;
78 skip_bits(&gb, 4); // version
79 if ((packing_scheme = get_bits(&gb, 2)) == 0)
80 return AVERROR_INVALIDDATA;
82 flags |= RTP_FLAG_KEY;
83 has_payload_desc = get_bits1(&gb);
84 has_packet_info = get_bits1(&gb);
85 skip_bits(&gb, 23); // reserved:7, cache payload info:1, payload ID:15
87 if (has_payload_desc) {
88 int data_len, pos, is_start, is_finish;
91 pos = get_bits_count(&gb) >> 3;
93 return AVERROR_INVALIDDATA;
95 skip_bits(&gb, 2); // has non-I frames:1, is sparse:1
96 is_start = get_bits1(&gb);
97 is_finish = get_bits1(&gb);
98 if (!is_start || !is_finish) {
99 av_log_missing_feature(s, "RTP-X-QT with payload description "
100 "split over several packets", 1);
101 return AVERROR(ENOSYS);
103 skip_bits(&gb, 12); // reserved
104 data_len = get_bits(&gb, 16);
106 avio_seek(&pb, pos + 4, SEEK_SET);
107 tag = avio_rl32(&pb);
108 if ((st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
109 tag != MKTAG('v','i','d','e')) ||
110 (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
111 tag != MKTAG('s','o','u','n')))
112 return AVERROR_INVALIDDATA;
113 av_set_pts_info(st, 32, 1, avio_rb32(&pb));
115 if (pos + data_len > len)
116 return AVERROR_INVALIDDATA;
118 while (avio_tell(&pb) + 4 < pos + data_len) {
119 int tlv_len = avio_rb16(&pb);
120 tag = avio_rl16(&pb);
121 if (avio_tell(&pb) + tlv_len > pos + data_len)
122 return AVERROR_INVALIDDATA;
124 #define MKTAG16(a,b) MKTAG(a,b,0,0)
126 case MKTAG16('s','d'): {
127 MOVStreamContext *msc;
128 void *priv_data = st->priv_data;
129 int nb_streams = s->nb_streams;
130 MOVContext *mc = av_mallocz(sizeof(*mc));
132 return AVERROR(ENOMEM);
134 st->priv_data = msc = av_mallocz(sizeof(MOVStreamContext));
137 st->priv_data = priv_data;
138 return AVERROR(ENOMEM);
140 /* ff_mov_read_stsd_entries updates stream s->nb_streams-1,
141 * so set it temporarily to indicate which stream to update. */
142 s->nb_streams = st->index + 1;
143 ff_mov_read_stsd_entries(mc, &pb, 1);
144 qt->bytes_per_frame = msc->bytes_per_frame;
147 st->priv_data = priv_data;
148 s->nb_streams = nb_streams;
152 avio_skip(&pb, tlv_len);
157 /* 32-bit alignment */
158 avio_skip(&pb, ((avio_tell(&pb) + 3) & ~3) - avio_tell(&pb));
160 avio_seek(&pb, 4, SEEK_SET);
162 if (has_packet_info) {
163 av_log_missing_feature(s, "RTP-X-QT with packet specific info", 1);
164 return AVERROR(ENOSYS);
167 alen = len - avio_tell(&pb);
169 return AVERROR_INVALIDDATA;
171 switch (packing_scheme) {
172 case 3: /* one data packet spread over 1 or multiple RTP packets */
173 if (qt->pkt.size > 0 && qt->timestamp == *timestamp) {
174 qt->pkt.data = av_realloc(qt->pkt.data, qt->pkt.size + alen +
175 FF_INPUT_BUFFER_PADDING_SIZE);
177 av_freep(&qt->pkt.data);
178 av_init_packet(&qt->pkt);
179 qt->pkt.data = av_malloc(alen + FF_INPUT_BUFFER_PADDING_SIZE);
181 qt->timestamp = *timestamp;
184 return AVERROR(ENOMEM);
185 memcpy(qt->pkt.data + qt->pkt.size, buf + avio_tell(&pb), alen);
186 qt->pkt.size += alen;
187 if (has_marker_bit) {
191 pkt->flags = flags & RTP_FLAG_KEY ? AV_PKT_FLAG_KEY : 0;
192 pkt->stream_index = st->index;
193 pkt->destruct = av_destruct_packet;
194 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
197 return AVERROR(EAGAIN);
199 case 1: /* constant packet size, multiple packets per RTP packet */
200 if (qt->bytes_per_frame == 0 ||
201 alen % qt->bytes_per_frame != 0)
202 return AVERROR_INVALIDDATA; /* wrongly padded */
203 qt->remaining = (alen / qt->bytes_per_frame) - 1;
204 if (av_new_packet(pkt, qt->bytes_per_frame))
205 return AVERROR(ENOMEM);
206 memcpy(pkt->data, buf + avio_tell(&pb), qt->bytes_per_frame);
207 pkt->flags = flags & RTP_FLAG_KEY ? AV_PKT_FLAG_KEY : 0;
208 pkt->stream_index = st->index;
209 if (qt->remaining > 0) {
210 av_freep(&qt->pkt.data);
211 qt->pkt.data = av_malloc(qt->remaining * qt->bytes_per_frame);
214 return AVERROR(ENOMEM);
216 qt->pkt.size = qt->remaining * qt->bytes_per_frame;
218 buf + avio_tell(&pb) + qt->bytes_per_frame,
219 qt->remaining * qt->bytes_per_frame);
220 qt->pkt.flags = pkt->flags;
225 default: /* unimplemented */
226 av_log_missing_feature(NULL, "RTP-X-QT with packing scheme 2", 1);
227 return AVERROR(ENOSYS);
231 static PayloadContext *qt_rtp_new(void)
233 return av_mallocz(sizeof(PayloadContext));
236 static void qt_rtp_free(PayloadContext *qt)
238 av_freep(&qt->pkt.data);
242 #define RTP_QT_HANDLER(m, n, s, t) \
243 RTPDynamicProtocolHandler ff_ ## m ## _rtp_ ## n ## _handler = { \
246 .codec_id = CODEC_ID_NONE, \
247 .alloc = qt_rtp_new, \
248 .free = qt_rtp_free, \
249 .parse_packet = qt_rtp_parse_packet, \
252 RTP_QT_HANDLER(qt, vid, "X-QT", AVMEDIA_TYPE_VIDEO);
253 RTP_QT_HANDLER(qt, aud, "X-QT", AVMEDIA_TYPE_AUDIO);
254 RTP_QT_HANDLER(quicktime, vid, "X-QUICKTIME", AVMEDIA_TYPE_VIDEO);
255 RTP_QT_HANDLER(quicktime, aud, "X-QUICKTIME", AVMEDIA_TYPE_AUDIO);