FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* RTP VP8 Depacketizer
3			* Copyright (c) 2010 Josh Allmann
4			* Copyright (c) 2012 Martin Storsjo
5			*
6			* This file is part of FFmpeg.
7			*
8			* FFmpeg is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU Lesser General Public
10			* License as published by the Free Software Foundation; either
11			* version 2.1 of the License, or (at your option) any later version.
12			*
13			* FFmpeg is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16			* Lesser General Public License for more details.
17			*
18			* You should have received a copy of the GNU Lesser General Public
19			* License along with FFmpeg; if not, write to the Free Software
20			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21			*/
22
23			/**
24			* @file
25			* @brief RTP support for the VP8 payload
26			* @author Josh Allmann <joshua.allmann@gmail.com>
27			* @see http://tools.ietf.org/html/draft-ietf-payload-vp8-05
28			*/
29
30			#include "libavutil/intreadwrite.h"
31
32			#include "avio_internal.h"
33			#include "rtpdec.h"
34
35			struct PayloadContext {
36			AVIOContext *data;
37			uint32_t timestamp;
38			int is_keyframe;
39			/* If sequence_ok is set, we keep returning data (even if we might have
40			* lost some data, but we haven't lost any too critical data that would
41			* cause the decoder to desynchronize and output random garbage).
42			*/
43			int sequence_ok;
44			int first_part_size;
45			uint16_t prev_seq;
46			int prev_pictureid;
47			int broken_frame;
48			/* If sequence_dirty is set, we have lost some data (critical or
49			* non-critical) and decoding will have some sort of artifacts, and
50			* we thus should request a new keyframe.
51			*/
52			int sequence_dirty;
53			int got_keyframe;
54			};
55
56		✗	static int vp8_broken_sequence(AVFormatContext *ctx, PayloadContext *vp8,
57			const char *msg)
58			{
59		✗	vp8->sequence_ok = 0;
60		✗	av_log(ctx, AV_LOG_WARNING, "%s", msg);
61		✗	ffio_free_dyn_buf(&vp8->data);
62		✗	return AVERROR(EAGAIN);
63			}
64
65		✗	static int vp8_handle_packet(AVFormatContext *ctx, PayloadContext *vp8,
66			AVStream *st, AVPacket *pkt, uint32_t *timestamp,
67			const uint8_t *buf, int len, uint16_t seq,
68			int flags)
69			{
70			int start_partition, end_packet;
71			int extended_bits, part_id;
72		✗	int pictureid_present = 0, tl0picidx_present = 0, tid_present = 0,
73		✗	keyidx_present = 0;
74		✗	int pictureid = -1, pictureid_mask = 0;
75		✗	int returned_old_frame = 0;
76		✗	uint32_t old_timestamp = 0;
77
78		✗	if (!buf) {
79		✗	if (vp8->data) {
80		✗	int ret = ff_rtp_finalize_packet(pkt, &vp8->data, st->index);
81		✗	if (ret < 0)
82		✗	return ret;
83		✗	*timestamp = vp8->timestamp;
84		✗	if (vp8->sequence_dirty)
85		✗	pkt->flags |= AV_PKT_FLAG_CORRUPT;
86		✗	return 0;
87			}
88		✗	return AVERROR(EAGAIN);
89			}
90
91		✗	if (len < 1)
92		✗	return AVERROR_INVALIDDATA;
93
94		✗	extended_bits = buf[0] & 0x80;
95		✗	start_partition = buf[0] & 0x10;
96		✗	part_id = buf[0] & 0x0f;
97		✗	end_packet = flags & RTP_FLAG_MARKER;
98		✗	buf++;
99		✗	len--;
100		✗	if (extended_bits) {
101		✗	if (len < 1)
102		✗	return AVERROR_INVALIDDATA;
103		✗	pictureid_present = buf[0] & 0x80;
104		✗	tl0picidx_present = buf[0] & 0x40;
105		✗	tid_present = buf[0] & 0x20;
106		✗	keyidx_present = buf[0] & 0x10;
107		✗	buf++;
108		✗	len--;
109			}
110		✗	if (pictureid_present) {
111		✗	if (len < 1)
112		✗	return AVERROR_INVALIDDATA;
113		✗	if (buf[0] & 0x80) {
114		✗	if (len < 2)
115		✗	return AVERROR_INVALIDDATA;
116		✗	pictureid = AV_RB16(buf) & 0x7fff;
117		✗	pictureid_mask = 0x7fff;
118		✗	buf += 2;
119		✗	len -= 2;
120			} else {
121		✗	pictureid = buf[0] & 0x7f;
122		✗	pictureid_mask = 0x7f;
123		✗	buf++;
124		✗	len--;
125			}
126			}
127		✗	if (tl0picidx_present) {
128			// Ignoring temporal level zero index
129		✗	buf++;
130		✗	len--;
131			}
132		✗	if (tid_present || keyidx_present) {
133			// Ignoring temporal layer index, layer sync bit and keyframe index
134		✗	buf++;
135		✗	len--;
136			}
137		✗	if (len < 1)
138		✗	return AVERROR_INVALIDDATA;
139
140		✗	if (start_partition && part_id == 0 && len >= 3) {
141			int res;
142		✗	int non_key = buf[0] & 0x01;
143		✗	if (!non_key) {
144		✗	ffio_free_dyn_buf(&vp8->data);
145			// Keyframe, decoding ok again
146		✗	vp8->sequence_ok = 1;
147		✗	vp8->sequence_dirty = 0;
148		✗	vp8->got_keyframe = 1;
149			} else {
150		✗	int can_continue = vp8->data && !vp8->is_keyframe &&
151		✗	avio_tell(vp8->data) >= vp8->first_part_size;
152		✗	if (!vp8->sequence_ok)
153		✗	return AVERROR(EAGAIN);
154		✗	if (!vp8->got_keyframe)
155		✗	return vp8_broken_sequence(ctx, vp8, "Keyframe missing\n");
156		✗	if (pictureid >= 0) {
157		✗	if (pictureid != ((vp8->prev_pictureid + 1) & pictureid_mask)) {
158		✗	return vp8_broken_sequence(ctx, vp8,
159			"Missed a picture, sequence broken\n");
160			} else {
161		✗	if (vp8->data && !can_continue)
162		✗	return vp8_broken_sequence(ctx, vp8,
163			"Missed a picture, sequence broken\n");
164			}
165			} else {
166		✗	uint16_t expected_seq = vp8->prev_seq + 1;
167		✗	int16_t diff = seq - expected_seq;
168		✗	if (vp8->data) {
169			// No picture id, so we can't know if missed packets
170			// contained any new frames. If diff == 0, we did get
171			// later packets from the same frame (matching timestamp),
172			// so we know we didn't miss any frame. If diff == 1 and
173			// we still have data (not flushed by the end of frame
174			// marker), the single missed packet must have been part
175			// of the same frame.
176		✗	if ((diff == 0 || diff == 1) && can_continue) {
177			// Proceed with what we have
178			} else {
179		✗	return vp8_broken_sequence(ctx, vp8,
180			"Missed too much, sequence broken\n");
181			}
182			} else {
183		✗	if (diff != 0)
184		✗	return vp8_broken_sequence(ctx, vp8,
185			"Missed unknown data, sequence broken\n");
186			}
187			}
188		✗	if (vp8->data) {
189		✗	vp8->sequence_dirty = 1;
190		✗	if (avio_tell(vp8->data) >= vp8->first_part_size) {
191		✗	int ret = ff_rtp_finalize_packet(pkt, &vp8->data, st->index);
192		✗	if (ret < 0)
193		✗	return ret;
194		✗	pkt->flags |= AV_PKT_FLAG_CORRUPT;
195		✗	returned_old_frame = 1;
196		✗	old_timestamp = vp8->timestamp;
197			} else {
198			// Shouldn't happen
199		✗	ffio_free_dyn_buf(&vp8->data);
200			}
201			}
202			}
203		✗	vp8->first_part_size = (AV_RL16(&buf[1]) << 3 | buf[0] >> 5) + 3;
204		✗	if ((res = avio_open_dyn_buf(&vp8->data)) < 0)
205		✗	return res;
206		✗	vp8->timestamp = *timestamp;
207		✗	vp8->broken_frame = 0;
208		✗	vp8->prev_pictureid = pictureid;
209		✗	vp8->is_keyframe = !non_key;
210			} else {
211		✗	uint16_t expected_seq = vp8->prev_seq + 1;
212
213		✗	if (!vp8->sequence_ok)
214		✗	return AVERROR(EAGAIN);
215
216		✗	if (vp8->timestamp != *timestamp) {
217			// Missed the start of the new frame, sequence broken
218		✗	return vp8_broken_sequence(ctx, vp8,
219			"Received no start marker; dropping frame\n");
220			}
221
222		✗	if (seq != expected_seq) {
223		✗	if (vp8->is_keyframe) {
224		✗	return vp8_broken_sequence(ctx, vp8,
225			"Missed part of a keyframe, sequence broken\n");
226		✗	} else if (vp8->data && avio_tell(vp8->data) >= vp8->first_part_size) {
227		✗	vp8->broken_frame = 1;
228		✗	vp8->sequence_dirty = 1;
229			} else {
230		✗	return vp8_broken_sequence(ctx, vp8,
231			"Missed part of the first partition, sequence broken\n");
232			}
233			}
234			}
235
236		✗	if (!vp8->data)
237		✗	return vp8_broken_sequence(ctx, vp8, "Received no start marker\n");
238
239		✗	vp8->prev_seq = seq;
240		✗	if (!vp8->broken_frame)
241		✗	avio_write(vp8->data, buf, len);
242
243		✗	if (returned_old_frame) {
244		✗	*timestamp = old_timestamp;
245		✗	return end_packet ? 1 : 0;
246			}
247
248		✗	if (end_packet) {
249			int ret;
250		✗	ret = ff_rtp_finalize_packet(pkt, &vp8->data, st->index);
251		✗	if (ret < 0)
252		✗	return ret;
253		✗	if (vp8->sequence_dirty)
254		✗	pkt->flags |= AV_PKT_FLAG_CORRUPT;
255		✗	if (vp8->is_keyframe)
256		✗	pkt->flags |= AV_PKT_FLAG_KEY;
257		✗	return 0;
258			}
259
260		✗	return AVERROR(EAGAIN);
261			}
262
263		✗	static av_cold int vp8_init(AVFormatContext *s, int st_index, PayloadContext *vp8)
264			{
265		✗	vp8->sequence_ok = 1;
266		✗	return 0;
267			}
268
269		✗	static void vp8_close_context(PayloadContext *vp8)
270			{
271		✗	ffio_free_dyn_buf(&vp8->data);
272		✗	}
273
274		✗	static int vp8_need_keyframe(PayloadContext *vp8)
275			{
276		✗	return vp8->sequence_dirty || !vp8->sequence_ok;
277			}
278
279			const RTPDynamicProtocolHandler ff_vp8_dynamic_handler = {
280			.enc_name = "VP8",
281			.codec_type = AVMEDIA_TYPE_VIDEO,
282			.codec_id = AV_CODEC_ID_VP8,
283			.priv_data_size = sizeof(PayloadContext),
284			.init = vp8_init,
285			.close = vp8_close_context,
286			.parse_packet = vp8_handle_packet,
287			.need_keyframe = vp8_need_keyframe,
288			};
289