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 "libavutil/mem.h"
32			#include "rtpdec_formats.h"
33			#include "rtsp.h"
34			#include "asf.h"
35			#include "avio_internal.h"
36			#include "demux.h"
37			#include "internal.h"
38
39			/**
40			* From MSDN 2.2.1.4, we learn that ASF data packets over RTP should not
41			* contain any padding. Unfortunately, the header min/max_pktsize are not
42			* updated (thus making min_pktsize invalid). Here, we "fix" these faulty
43			* min_pktsize values in the ASF file header.
44			* @return 0 on success, <0 on failure (currently -1).
45			*/
46		✗	static int rtp_asf_fix_header(uint8_t *buf, int len)
47			{
48		✗	uint8_t *p = buf, *end = buf + len;
49
50		✗	if (len < sizeof(ff_asf_guid) * 2 + 22 ||
51		✗	memcmp(p, ff_asf_header, sizeof(ff_asf_guid))) {
52		✗	return -1;
53			}
54		✗	p += sizeof(ff_asf_guid) + 14;
55			do {
56		✗	uint64_t chunksize = AV_RL64(p + sizeof(ff_asf_guid));
57		✗	int skip = 6 * 8 + 3 * 4 + sizeof(ff_asf_guid) * 2;
58		✗	if (memcmp(p, ff_asf_file_header, sizeof(ff_asf_guid))) {
59		✗	if (chunksize < sizeof(ff_asf_guid) + 8)
60		✗	return -1;
61		✗	if (chunksize > end - p)
62		✗	return -1;
63		✗	p += chunksize;
64		✗	continue;
65			}
66
67		✗	if (end - p < 8 + skip)
68		✗	break;
69			/* skip most of the file header, to min_pktsize */
70		✗	p += skip;
71		✗	if (AV_RL32(p) == AV_RL32(p + 4)) {
72			/* and set that to zero */
73		✗	AV_WL32(p, 0);
74		✗	return 0;
75			}
76		✗	break;
77		✗	} while (end - p >= sizeof(ff_asf_guid) + 8);
78
79		✗	return -1;
80			}
81
82			/**
83			* The following code is basically a buffered AVIOContext,
84			* with the added benefit of returning -EAGAIN (instead of 0)
85			* on packet boundaries, such that the ASF demuxer can return
86			* safely and resume business at the next packet.
87			*/
88		✗	static int packetizer_read(void *opaque, uint8_t *buf, int buf_size)
89			{
90		✗	return AVERROR(EAGAIN);
91			}
92
93		✗	static void init_packetizer(FFIOContext *pb, uint8_t *buf, int len)
94			{
95		✗	ffio_init_context(pb, buf, len, 0, NULL, packetizer_read, NULL, NULL);
96
97			/* this "fills" the buffer with its current content */
98		✗	pb->pub.pos = len;
99		✗	pb->pub.buf_end = buf + len;
100		✗	}
101
102		✗	int ff_wms_parse_sdp_a_line(AVFormatContext *s, const char *p)
103			{
104		✗	int ret = 0;
105		✗	if (av_strstart(p, "pgmpu:data:application/vnd.ms.wms-hdr.asfv1;base64,", &p)) {
106			FFIOContext pb;
107		✗	RTSPState *rt = s->priv_data;
108		✗	AVDictionary *opts = NULL;
109		✗	int len = strlen(p) * 6 / 8;
110		✗	char *buf = av_mallocz(len);
111			const AVInputFormat *iformat;
112
113		✗	if (!buf)
114		✗	return AVERROR(ENOMEM);
115		✗	av_base64_decode(buf, p, len);
116
117		✗	if (rtp_asf_fix_header(buf, len) < 0)
118		✗	av_log(s, AV_LOG_ERROR,
119			"Failed to fix invalid RTSP-MS/ASF min_pktsize\n");
120		✗	init_packetizer(&pb, buf, len);
121		✗	if (rt->asf_ctx) {
122		✗	avformat_close_input(&rt->asf_ctx);
123			}
124
125		✗	if (!(iformat = av_find_input_format("asf"))) {
126		✗	av_free(buf);
127		✗	return AVERROR_DEMUXER_NOT_FOUND;
128			}
129
130		✗	rt->asf_ctx = avformat_alloc_context();
131		✗	if (!rt->asf_ctx) {
132		✗	av_free(buf);
133		✗	return AVERROR(ENOMEM);
134			}
135		✗	rt->asf_ctx->pb = &pb.pub;
136		✗	av_dict_set(&opts, "no_resync_search", "1", 0);
137
138		✗	if ((ret = ff_copy_whiteblacklists(rt->asf_ctx, s)) < 0) {
139		✗	av_dict_free(&opts);
140		✗	return ret;
141			}
142
143		✗	ret = avformat_open_input(&rt->asf_ctx, "", iformat, &opts);
144		✗	av_dict_free(&opts);
145		✗	if (ret < 0) {
146		✗	av_free(pb.pub.buffer);
147		✗	return ret;
148			}
149		✗	av_dict_copy(&s->metadata, rt->asf_ctx->metadata, 0);
150		✗	rt->asf_pb_pos = avio_tell(&pb.pub);
151		✗	av_free(pb.pub.buffer);
152		✗	rt->asf_ctx->pb = NULL;
153			}
154		✗	return ret;
155			}
156
157		✗	static int asfrtp_parse_sdp_line(AVFormatContext *s, int stream_index,
158			PayloadContext *asf, const char *line)
159			{
160		✗	if (stream_index < 0)
161		✗	return 0;
162		✗	if (av_strstart(line, "stream:", &line)) {
163		✗	RTSPState *rt = s->priv_data;
164
165		✗	s->streams[stream_index]->id = strtol(line, NULL, 10);
166
167		✗	if (rt->asf_ctx) {
168			int i;
169
170		✗	for (i = 0; i < rt->asf_ctx->nb_streams; i++) {
171		✗	if (s->streams[stream_index]->id == rt->asf_ctx->streams[i]->id) {
172		✗	avcodec_parameters_copy(s->streams[stream_index]->codecpar,
173		✗	rt->asf_ctx->streams[i]->codecpar);
174		✗	ffstream(s->streams[stream_index])->need_parsing =
175		✗	ffstream(rt->asf_ctx->streams[i])->need_parsing;
176		✗	avpriv_set_pts_info(s->streams[stream_index], 32, 1, 1000);
177			}
178			}
179			}
180			}
181
182		✗	return 0;
183			}
184
185			struct PayloadContext {
186			FFIOContext pb;
187			AVIOContext *pktbuf;
188			uint8_t *buf;
189			};
190
191			/**
192			* @return 0 when a packet was written into /p pkt, and no more data is left;
193			* 1 when a packet was written into /p pkt, and more packets might be left;
194			* <0 when not enough data was provided to return a full packet, or on error.
195			*/
196		✗	static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf,
197			AVStream *st, AVPacket *pkt,
198			uint32_t *timestamp,
199			const uint8_t *buf, int len, uint16_t seq,
200			int flags)
201			{
202		✗	FFIOContext *const pb0 = &asf->pb;
203		✗	AVIOContext *const pb = &pb0->pub;
204			int res, mflags, len_off;
205		✗	RTSPState *rt = s->priv_data;
206
207		✗	if (!rt->asf_ctx)
208		✗	return -1;
209
210		✗	if (len > 0) {
211		✗	int off, out_len = 0;
212
213		✗	if (len < 4)
214		✗	return -1;
215
216		✗	av_freep(&asf->buf);
217
218		✗	ffio_init_read_context(pb0, buf, len);
219
220		✗	while (avio_tell(pb) + 4 < len) {
221		✗	int start_off = avio_tell(pb);
222
223		✗	mflags = avio_r8(pb);
224		✗	len_off = avio_rb24(pb);
225		✗	if (mflags & 0x20) /**< relative timestamp */
226		✗	avio_skip(pb, 4);
227		✗	if (mflags & 0x10) /**< has duration */
228		✗	avio_skip(pb, 4);
229		✗	if (mflags & 0x8) /**< has location ID */
230		✗	avio_skip(pb, 4);
231		✗	off = avio_tell(pb);
232
233		✗	if (!(mflags & 0x40)) {
234			/**
235			* If 0x40 is not set, the len_off field specifies an offset
236			* of this packet's payload data in the complete (reassembled)
237			* ASF packet. This is used to spread one ASF packet over
238			* multiple RTP packets.
239			*/
240		✗	if (asf->pktbuf && len_off != avio_tell(asf->pktbuf)) {
241		✗	ffio_free_dyn_buf(&asf->pktbuf);
242			}
243		✗	if (!len_off && !asf->pktbuf &&
244		✗	(res = avio_open_dyn_buf(&asf->pktbuf)) < 0)
245		✗	return res;
246		✗	if (!asf->pktbuf)
247		✗	return AVERROR(EIO);
248
249		✗	avio_write(asf->pktbuf, buf + off, len - off);
250		✗	avio_skip(pb, len - off);
251		✗	if (!(flags & RTP_FLAG_MARKER))
252		✗	return -1;
253		✗	out_len = avio_close_dyn_buf(asf->pktbuf, &asf->buf);
254		✗	asf->pktbuf = NULL;
255			} else {
256			/**
257			* If 0x40 is set, the len_off field specifies the length of
258			* the next ASF packet that can be read from this payload
259			* data alone. This is commonly the same as the payload size,
260			* but could be less in case of packet splitting (i.e.
261			* multiple ASF packets in one RTP packet).
262			*/
263
264		✗	int cur_len = start_off + len_off - off;
265		✗	int prev_len = out_len;
266		✗	out_len += cur_len;
267		✗	if (FFMIN(cur_len, len - off) < 0)
268		✗	return -1;
269		✗	if ((res = av_reallocp(&asf->buf, out_len)) < 0)
270		✗	return res;
271		✗	memcpy(asf->buf + prev_len, buf + off,
272		✗	FFMIN(cur_len, len - off));
273		✗	avio_skip(pb, cur_len);
274			}
275			}
276
277		✗	init_packetizer(pb0, asf->buf, out_len);
278		✗	pb->pos += rt->asf_pb_pos;
279		✗	pb->eof_reached = 0;
280		✗	rt->asf_ctx->pb = pb;
281			}
282
283		✗	for (;;) {
284			int i;
285
286		✗	res = ff_read_packet(rt->asf_ctx, pkt);
287		✗	rt->asf_pb_pos = avio_tell(pb);
288		✗	if (res != 0)
289		✗	break;
290		✗	for (i = 0; i < s->nb_streams; i++) {
291		✗	if (s->streams[i]->id == rt->asf_ctx->streams[pkt->stream_index]->id) {
292		✗	pkt->stream_index = i;
293		✗	return 1; // FIXME: return 0 if last packet
294			}
295			}
296		✗	av_packet_unref(pkt);
297			}
298
299		✗	return res == 1 ? -1 : res;
300			}
301
302		✗	static void asfrtp_close_context(PayloadContext *asf)
303			{
304		✗	ffio_free_dyn_buf(&asf->pktbuf);
305		✗	av_freep(&asf->buf);
306		✗	}
307
308			#define RTP_ASF_HANDLER(n, s, t) \
309			const RTPDynamicProtocolHandler ff_ms_rtp_ ## n ## _handler = { \
310			.enc_name = s, \
311			.codec_type = t, \
312			.codec_id = AV_CODEC_ID_NONE, \
313			.priv_data_size = sizeof(PayloadContext), \
314			.parse_sdp_a_line = asfrtp_parse_sdp_line, \
315			.close = asfrtp_close_context, \
316			.parse_packet = asfrtp_parse_packet, \
317			}
318
319			RTP_ASF_HANDLER(asf_pfv, "x-asf-pf", AVMEDIA_TYPE_VIDEO);
320			RTP_ASF_HANDLER(asf_pfa, "x-asf-pf", AVMEDIA_TYPE_AUDIO);
321