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>
30 #include "avio_internal.h"
34 #include "libavcodec/get_bits.h"
36 struct PayloadContext {
38 int bytes_per_frame, remaining;
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)
49 int packing_scheme, has_payload_desc, has_packet_info, alen,
50 has_marker_bit = flags & RTP_FLAG_MARKER;
53 int num = qt->pkt.size / qt->bytes_per_frame;
55 if (av_new_packet(pkt, qt->bytes_per_frame))
56 return AVERROR(ENOMEM);
57 pkt->stream_index = st->index;
58 pkt->flags = qt->pkt.flags;
60 &qt->pkt.data[(num - qt->remaining) * qt->bytes_per_frame],
62 if (--qt->remaining == 0) {
63 av_freep(&qt->pkt.data);
66 return qt->remaining > 0;
70 * The RTP payload is described in:
71 * http://developer.apple.com/quicktime/icefloe/dispatch026.html
73 init_get_bits(&gb, buf, len << 3);
74 ffio_init_context(&pb, (uint8_t*)buf, len, 0, NULL, NULL, NULL, NULL);
77 return AVERROR_INVALIDDATA;
79 skip_bits(&gb, 4); // version
80 if ((packing_scheme = get_bits(&gb, 2)) == 0)
81 return AVERROR_INVALIDDATA;
83 flags |= RTP_FLAG_KEY;
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
88 if (has_payload_desc) {
89 int data_len, pos, is_start, is_finish;
92 pos = get_bits_count(&gb) >> 3;
94 return AVERROR_INVALIDDATA;
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;
104 skip_bits(&gb, 12); // reserved
105 data_len = get_bits(&gb, 16);
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));
116 if (pos + data_len > len)
117 return AVERROR_INVALIDDATA;
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;
125 #define MKTAG16(a,b) MKTAG(a,b,0,0)
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));
133 return AVERROR(ENOMEM);
135 st->priv_data = msc = av_mallocz(sizeof(MOVStreamContext));
138 st->priv_data = priv_data;
139 return AVERROR(ENOMEM);
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;
148 st->priv_data = priv_data;
149 s->nb_streams = nb_streams;
153 avio_skip(&pb, tlv_len);
158 /* 32-bit alignment */
159 avio_skip(&pb, ((avio_tell(&pb) + 3) & ~3) - avio_tell(&pb));
161 avio_seek(&pb, 4, SEEK_SET);
163 if (has_packet_info) {
164 avpriv_request_sample(s, "RTP-X-QT with packet-specific info");
165 return AVERROR_PATCHWELCOME;
168 alen = len - avio_tell(&pb);
170 return AVERROR_INVALIDDATA;
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) {
176 if ((err = av_reallocp(&qt->pkt.data, qt->pkt.size + alen +
177 FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
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);
186 return AVERROR(ENOMEM);
188 qt->timestamp = *timestamp;
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);
199 pkt->flags = flags & RTP_FLAG_KEY ? AV_PKT_FLAG_KEY : 0;
200 pkt->stream_index = st->index;
201 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
204 return AVERROR(EAGAIN);
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 = flags & RTP_FLAG_KEY ? 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);
221 return AVERROR(ENOMEM);
223 qt->pkt.size = qt->remaining * qt->bytes_per_frame;
225 buf + avio_tell(&pb) + qt->bytes_per_frame,
226 qt->remaining * qt->bytes_per_frame);
227 qt->pkt.flags = pkt->flags;
232 default: /* unimplemented */
233 avpriv_request_sample(NULL, "RTP-X-QT with packing scheme 2");
234 return AVERROR_PATCHWELCOME;
238 static void qt_rtp_free(PayloadContext *qt)
240 av_freep(&qt->pkt.data);
243 #define RTP_QT_HANDLER(m, n, s, t) \
244 RTPDynamicProtocolHandler ff_ ## m ## _rtp_ ## n ## _handler = { \
247 .codec_id = AV_CODEC_ID_NONE, \
248 .priv_data_size = sizeof(PayloadContext), \
249 .free = qt_rtp_free, \
250 .parse_packet = qt_rtp_parse_packet, \
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);