FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* Microsoft RTP/ASF support.
3			* Copyright (c) 2008 Ronald S. Bultje
4			*
5			* This file is part of FFmpeg.
6			*
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.
11			*
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.
16			*
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
20			*/
21
22			/**
23			* @file
24			* @brief Microsoft RTP/ASF support
25			* @author Ronald S. Bultje <rbultje@ronald.bitfreak.net>
26			*/
27
28			#include "libavutil/base64.h"
29			#include "libavutil/avstring.h"
30			#include "libavutil/intreadwrite.h"
31			#include "rtpdec_formats.h"
32			#include "rtsp.h"
33			#include "asf.h"
34			#include "avio_internal.h"
35			#include "demux.h"
36			#include "internal.h"
37
38			/**
39			* From MSDN 2.2.1.4, we learn that ASF data packets over RTP should not
40			* contain any padding. Unfortunately, the header min/max_pktsize are not
41			* updated (thus making min_pktsize invalid). Here, we "fix" these faulty
42			* min_pktsize values in the ASF file header.
43			* @return 0 on success, <0 on failure (currently -1).
44			*/
45		✗	static int rtp_asf_fix_header(uint8_t *buf, int len)
46			{
47		✗	uint8_t *p = buf, *end = buf + len;
48
49		✗	if (len < sizeof(ff_asf_guid) * 2 + 22 ||
50		✗	memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
51		✗	return -1;
52			}
53		✗	p += sizeof(ff_asf_guid) + 14;
54			do {
55		✗	uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid));
56		✗	int skip = 6 * 8 + 3 * 4 + sizeof(ff_asf_guid) * 2;
57		✗	if (memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
58		✗	if (chunksize > end - p)
59		✗	return -1;
60		✗	p += chunksize;
61		✗	continue;
62			}
63
64		✗	if (end - p < 8 + skip)
65		✗	break;
66			/* skip most of the file header, to min_pktsize */
67		✗	p += skip;
68		✗	if (AV_RL32(p) == AV_RL32(p + 4)) {
69			/* and set that to zero */
70		✗	AV_WL32(p, 0);
71		✗	return 0;
72			}
73		✗	break;
74		✗	} while (end - p >= sizeof(ff_asf_guid) + 8);
75
76		✗	return -1;
77			}
78
79			/**
80			* The following code is basically a buffered AVIOContext,
81			* with the added benefit of returning -EAGAIN (instead of 0)
82			* on packet boundaries, such that the ASF demuxer can return
83			* safely and resume business at the next packet.
84			*/
85		✗	static int packetizer_read(void *opaque, uint8_t *buf, int buf_size)
86			{
87		✗	return AVERROR(EAGAIN);
88			}
89
90		✗	static void init_packetizer(FFIOContext *pb, uint8_t *buf, int len)
91			{
92		✗	ffio_init_context(pb, buf, len, 0, NULL, packetizer_read, NULL, NULL);
93
94			/* this "fills" the buffer with its current content */
95		✗	pb->pub.pos = len;
96		✗	pb->pub.buf_end = buf + len;
97		✗	}
98
99		✗	int ff_wms_parse_sdp_a_line(AVFormatContext *s, const char *p)
100			{
101		✗	int ret = 0;
102		✗	if (av_strstart(p, "pgmpu:data:application/vnd.ms.wms-hdr.asfv1;base64,", &p)) {
103			FFIOContext pb;
104		✗	RTSPState *rt = s->priv_data;
105		✗	AVDictionary *opts = NULL;
106		✗	int len = strlen(p) * 6 / 8;
107		✗	char *buf = av_mallocz(len);
108			const AVInputFormat *iformat;
109
110		✗	if (!buf)
111		✗	return AVERROR(ENOMEM);
112		✗	av_base64_decode(buf, p, len);
113
114		✗	if (rtp_asf_fix_header(buf, len) < 0)
115		✗	av_log(s, AV_LOG_ERROR,
116			"Failed to fix invalid RTSP-MS/ASF min_pktsize\n");
117		✗	init_packetizer(&pb, buf, len);
118		✗	if (rt->asf_ctx) {
119		✗	avformat_close_input(&rt->asf_ctx);
120			}
121
122		✗	if (!(iformat = av_find_input_format("asf")))
123		✗	return AVERROR_DEMUXER_NOT_FOUND;
124
125		✗	rt->asf_ctx = avformat_alloc_context();
126		✗	if (!rt->asf_ctx) {
127		✗	av_free(buf);
128		✗	return AVERROR(ENOMEM);
129			}
130		✗	rt->asf_ctx->pb = &pb.pub;
131		✗	av_dict_set(&opts, "no_resync_search", "1", 0);
132
133		✗	if ((ret = ff_copy_whiteblacklists(rt->asf_ctx, s)) < 0) {
134		✗	av_dict_free(&opts);
135		✗	return ret;
136			}
137
138		✗	ret = avformat_open_input(&rt->asf_ctx, "", iformat, &opts);
139		✗	av_dict_free(&opts);
140		✗	if (ret < 0) {
141		✗	av_free(pb.pub.buffer);
142		✗	return ret;
143			}
144		✗	av_dict_copy(&s->metadata, rt->asf_ctx->metadata, 0);
145		✗	rt->asf_pb_pos = avio_tell(&pb.pub);
146		✗	av_free(pb.pub.buffer);
147		✗	rt->asf_ctx->pb = NULL;
148			}
149		✗	return ret;
150			}
151
152		✗	static int asfrtp_parse_sdp_line(AVFormatContext *s, int stream_index,
153			PayloadContext *asf, const char *line)
154			{
155		✗	if (stream_index < 0)
156		✗	return 0;
157		✗	if (av_strstart(line, "stream:", &line)) {
158		✗	RTSPState *rt = s->priv_data;
159
160		✗	s->streams[stream_index]->id = strtol(line, NULL, 10);
161
162		✗	if (rt->asf_ctx) {
163			int i;
164
165		✗	for (i = 0; i < rt->asf_ctx->nb_streams; i++) {
166		✗	if (s->streams[stream_index]->id == rt->asf_ctx->streams[i]->id) {
167		✗	avcodec_parameters_copy(s->streams[stream_index]->codecpar,
168		✗	rt->asf_ctx->streams[i]->codecpar);
169		✗	ffstream(s->streams[stream_index])->need_parsing =
170		✗	ffstream(rt->asf_ctx->streams[i])->need_parsing;
171		✗	avpriv_set_pts_info(s->streams[stream_index], 32, 1, 1000);
172			}
173			}
174			}
175			}
176
177		✗	return 0;
178			}
179
180			struct PayloadContext {
181			FFIOContext pb;
182			AVIOContext *pktbuf;
183			uint8_t *buf;
184			};
185
186			/**
187			* @return 0 when a packet was written into /p pkt, and no more data is left;
188			* 1 when a packet was written into /p pkt, and more packets might be left;
189			* <0 when not enough data was provided to return a full packet, or on error.
190			*/
191		✗	static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf,
192			AVStream *st, AVPacket *pkt,
193			uint32_t *timestamp,
194			const uint8_t *buf, int len, uint16_t seq,
195			int flags)
196			{
197		✗	FFIOContext *const pb0 = &asf->pb;
198		✗	AVIOContext *const pb = &pb0->pub;
199			int res, mflags, len_off;
200		✗	RTSPState *rt = s->priv_data;
201
202		✗	if (!rt->asf_ctx)
203		✗	return -1;
204
205		✗	if (len > 0) {
206		✗	int off, out_len = 0;
207
208		✗	if (len < 4)
209		✗	return -1;
210
211		✗	av_freep(&asf->buf);
212
213		✗	ffio_init_read_context(pb0, buf, len);
214
215		✗	while (avio_tell(pb) + 4 < len) {
216		✗	int start_off = avio_tell(pb);
217
218		✗	mflags = avio_r8(pb);
219		✗	len_off = avio_rb24(pb);
220		✗	if (mflags & 0x20) /**< relative timestamp */
221		✗	avio_skip(pb, 4);
222		✗	if (mflags & 0x10) /**< has duration */
223		✗	avio_skip(pb, 4);
224		✗	if (mflags & 0x8) /**< has location ID */
225		✗	avio_skip(pb, 4);
226		✗	off = avio_tell(pb);
227
228		✗	if (!(mflags & 0x40)) {
229			/**
230			* If 0x40 is not set, the len_off field specifies an offset
231			* of this packet's payload data in the complete (reassembled)
232			* ASF packet. This is used to spread one ASF packet over
233			* multiple RTP packets.
234			*/
235		✗	if (asf->pktbuf && len_off != avio_tell(asf->pktbuf)) {
236		✗	ffio_free_dyn_buf(&asf->pktbuf);
237			}
238		✗	if (!len_off && !asf->pktbuf &&
239		✗	(res = avio_open_dyn_buf(&asf->pktbuf)) < 0)
240		✗	return res;
241		✗	if (!asf->pktbuf)
242		✗	return AVERROR(EIO);
243
244		✗	avio_write(asf->pktbuf, buf + off, len - off);
245		✗	avio_skip(pb, len - off);
246		✗	if (!(flags & RTP_FLAG_MARKER))
247		✗	return -1;
248		✗	out_len = avio_close_dyn_buf(asf->pktbuf, &asf->buf);
249		✗	asf->pktbuf = NULL;
250			} else {
251			/**
252			* If 0x40 is set, the len_off field specifies the length of
253			* the next ASF packet that can be read from this payload
254			* data alone. This is commonly the same as the payload size,
255			* but could be less in case of packet splitting (i.e.
256			* multiple ASF packets in one RTP packet).
257			*/
258
259		✗	int cur_len = start_off + len_off - off;
260		✗	int prev_len = out_len;
261		✗	out_len += cur_len;
262		✗	if (FFMIN(cur_len, len - off) < 0)
263		✗	return -1;
264		✗	if ((res = av_reallocp(&asf->buf, out_len)) < 0)
265		✗	return res;
266		✗	memcpy(asf->buf + prev_len, buf + off,
267		✗	FFMIN(cur_len, len - off));
268		✗	avio_skip(pb, cur_len);
269			}
270			}
271
272		✗	init_packetizer(pb0, asf->buf, out_len);
273		✗	pb->pos += rt->asf_pb_pos;
274		✗	pb->eof_reached = 0;
275		✗	rt->asf_ctx->pb = pb;
276			}
277
278		✗	for (;;) {
279			int i;
280
281		✗	res = ff_read_packet(rt->asf_ctx, pkt);
282		✗	rt->asf_pb_pos = avio_tell(pb);
283		✗	if (res != 0)
284		✗	break;
285		✗	for (i = 0; i < s->nb_streams; i++) {
286		✗	if (s->streams[i]->id == rt->asf_ctx->streams[pkt->stream_index]->id) {
287		✗	pkt->stream_index = i;
288		✗	return 1; // FIXME: return 0 if last packet
289			}
290			}
291		✗	av_packet_unref(pkt);
292			}
293
294		✗	return res == 1 ? -1 : res;
295			}
296
297		✗	static void asfrtp_close_context(PayloadContext *asf)
298			{
299		✗	ffio_free_dyn_buf(&asf->pktbuf);
300		✗	av_freep(&asf->buf);
301		✗	}
302
303			#define RTP_ASF_HANDLER(n, s, t) \
304			const RTPDynamicProtocolHandler ff_ms_rtp_ ## n ## _handler = { \
305			.enc_name = s, \
306			.codec_type = t, \
307			.codec_id = AV_CODEC_ID_NONE, \
308			.priv_data_size = sizeof(PayloadContext), \
309			.parse_sdp_a_line = asfrtp_parse_sdp_line, \
310			.close = asfrtp_close_context, \
311			.parse_packet = asfrtp_parse_packet, \
312			}
313
314			RTP_ASF_HANDLER(asf_pfv, "x-asf-pf", AVMEDIA_TYPE_VIDEO);
315			RTP_ASF_HANDLER(asf_pfa, "x-asf-pf", AVMEDIA_TYPE_AUDIO);
316