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