FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* RTP H.264 Protocol (RFC3984)
3			* Copyright (c) 2006 Ryan Martell
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 H.264 / RTP Code (RFC3984)
25			* @author Ryan Martell <rdm4@martellventures.com>
26			*
27			* @note Notes:
28			* Notes:
29			* This currently supports packetization mode:
30			* Single Nal Unit Mode (0), or
31			* Non-Interleaved Mode (1). It currently does not support
32			* Interleaved Mode (2). (This requires implementing STAP-B, MTAP16, MTAP24,
33			* FU-B packet types)
34			*/
35
36			#include "libavutil/attributes.h"
37			#include "libavutil/base64.h"
38			#include "libavutil/intreadwrite.h"
39			#include "libavutil/avstring.h"
40			#include "libavutil/mem.h"
41			#include "avformat.h"
42
43			#include "rtpdec.h"
44			#include "rtpdec_formats.h"
45
46			struct PayloadContext {
47			// sdp setup parameters
48			uint8_t profile_idc;
49			uint8_t profile_iop;
50			uint8_t level_idc;
51			int packetization_mode;
52			#ifdef DEBUG
53			int packet_types_received[32];
54			#endif
55			};
56
57			#ifdef DEBUG
58			#define COUNT_NAL_TYPE(data, nal) data->packet_types_received[(nal) & 0x1f]++
59			#define NAL_COUNTERS data->packet_types_received
60			#else
61			#define COUNT_NAL_TYPE(data, nal) do { } while (0)
62			#define NAL_COUNTERS NULL
63			#endif
64			#define NAL_MASK 0x1f
65
66			static const uint8_t start_sequence[] = { 0, 0, 0, 1 };
67
68		✗	static void parse_profile_level_id(AVFormatContext *s,
69			PayloadContext *h264_data,
70			const char *value)
71			{
72			char buffer[3];
73			// 6 characters=3 bytes, in hex.
74			uint8_t profile_idc;
75			uint8_t profile_iop;
76			uint8_t level_idc;
77
78		✗	buffer[0] = value[0];
79		✗	buffer[1] = value[1];
80		✗	buffer[2] = '\0';
81		✗	profile_idc = strtol(buffer, NULL, 16);
82		✗	buffer[0] = value[2];
83		✗	buffer[1] = value[3];
84		✗	profile_iop = strtol(buffer, NULL, 16);
85		✗	buffer[0] = value[4];
86		✗	buffer[1] = value[5];
87		✗	level_idc = strtol(buffer, NULL, 16);
88
89		✗	av_log(s, AV_LOG_DEBUG,
90			"RTP Profile IDC: %x Profile IOP: %x Level: %x\n",
91			profile_idc, profile_iop, level_idc);
92		✗	h264_data->profile_idc = profile_idc;
93		✗	h264_data->profile_iop = profile_iop;
94		✗	h264_data->level_idc = level_idc;
95		✗	}
96
97		✗	int ff_h264_parse_sprop_parameter_sets(AVFormatContext *s,
98			uint8_t **data_ptr, int *size_ptr,
99			const char *value)
100			{
101			char base64packet[1024];
102			uint8_t decoded_packet[1024];
103			int packet_size;
104
105		✗	while (*value) {
106		✗	char *dst = base64packet;
107
108		✗	while (*value && *value != ','
109		✗	&& (dst - base64packet) < sizeof(base64packet) - 1) {
110		✗	*dst++ = *value++;
111			}
112		✗	*dst++ = '\0';
113
114		✗	if (*value == ',')
115		✗	value++;
116
117		✗	packet_size = av_base64_decode(decoded_packet, base64packet,
118			sizeof(decoded_packet));
119		✗	if (packet_size > 0) {
120		✗	uint8_t *dest = av_realloc(*data_ptr,
121		✗	packet_size + sizeof(start_sequence) +
122		✗	*size_ptr +
123			AV_INPUT_BUFFER_PADDING_SIZE);
124		✗	if (!dest) {
125		✗	av_log(s, AV_LOG_ERROR,
126			"Unable to allocate memory for extradata!\n");
127		✗	return AVERROR(ENOMEM);
128			}
129		✗	*data_ptr = dest;
130
131		✗	memcpy(dest + *size_ptr, start_sequence,
132			sizeof(start_sequence));
133		✗	memcpy(dest + *size_ptr + sizeof(start_sequence),
134			decoded_packet, packet_size);
135		✗	memset(dest + *size_ptr + sizeof(start_sequence) +
136			packet_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
137
138		✗	*size_ptr += sizeof(start_sequence) + packet_size;
139			}
140			}
141
142		✗	return 0;
143			}
144
145		✗	static int sdp_parse_fmtp_config_h264(AVFormatContext *s,
146			AVStream *stream,
147			PayloadContext *h264_data,
148			const char *attr, const char *value)
149			{
150		✗	AVCodecParameters *par = stream->codecpar;
151
152		✗	if (!strcmp(attr, "packetization-mode")) {
153		✗	av_log(s, AV_LOG_DEBUG, "RTP Packetization Mode: %d\n", atoi(value));
154		✗	h264_data->packetization_mode = atoi(value);
155			/*
156			* Packetization Mode:
157			* 0 or not present: Single NAL mode (Only nals from 1-23 are allowed)
158			* 1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed.
159			* 2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A),
160			* and 29 (FU-B) are allowed.
161			*/
162		✗	if (h264_data->packetization_mode > 1)
163		✗	av_log(s, AV_LOG_ERROR,
164			"Interleaved RTP mode is not supported yet.\n");
165		✗	} else if (!strcmp(attr, "profile-level-id")) {
166		✗	if (strlen(value) == 6)
167		✗	parse_profile_level_id(s, h264_data, value);
168		✗	} else if (!strcmp(attr, "sprop-parameter-sets")) {
169			int ret;
170		✗	if (*value == 0 || value[strlen(value) - 1] == ',') {
171		✗	av_log(s, AV_LOG_WARNING, "Missing PPS in sprop-parameter-sets, ignoring\n");
172		✗	return 0;
173			}
174		✗	par->extradata_size = 0;
175		✗	av_freep(&par->extradata);
176		✗	ret = ff_h264_parse_sprop_parameter_sets(s, &par->extradata,
177			&par->extradata_size, value);
178		✗	av_log(s, AV_LOG_DEBUG, "Extradata set to %p (size: %d)\n",
179			par->extradata, par->extradata_size);
180		✗	return ret;
181			}
182		✗	return 0;
183			}
184
185		✗	void ff_h264_parse_framesize(AVCodecParameters *par, const char *p)
186			{
187			char buf1[50];
188		✗	char *dst = buf1;
189
190			// remove the protocol identifier
191		✗	while (*p && *p == ' ')
192		✗	p++; // strip spaces.
193		✗	while (*p && *p != ' ')
194		✗	p++; // eat protocol identifier
195		✗	while (*p && *p == ' ')
196		✗	p++; // strip trailing spaces.
197		✗	while (*p && *p != '-' && (dst - buf1) < sizeof(buf1) - 1)
198		✗	*dst++ = *p++;
199		✗	*dst = '\0';
200
201		✗	if (*p != '-')
202		✗	return;
203
204			// a='framesize:96 320-240'
205			// set our parameters
206		✗	par->width = atoi(buf1);
207		✗	par->height = atoi(p + 1); // skip the -
208			}
209
210		✗	int ff_h264_handle_aggregated_packet(AVFormatContext *ctx, PayloadContext *data, AVPacket *pkt,
211			const uint8_t *buf, int len,
212			int skip_between, int *nal_counters,
213			int nal_mask)
214			{
215		✗	int pass = 0;
216		✗	int total_length = 0;
217		✗	uint8_t *dst = NULL;
218			int ret;
219
220			// first we are going to figure out the total size
221		✗	for (pass = 0; pass < 2; pass++) {
222		✗	const uint8_t *src = buf;
223		✗	int src_len = len;
224
225		✗	while (src_len > 2) {
226		✗	uint16_t nal_size = AV_RB16(src);
227
228			// consume the length of the aggregate
229		✗	src += 2;
230		✗	src_len -= 2;
231
232		✗	if (nal_size <= src_len) {
233		✗	if (pass == 0) {
234			// counting
235		✗	total_length += sizeof(start_sequence) + nal_size;
236			} else {
237			// copying
238		✗	memcpy(dst, start_sequence, sizeof(start_sequence));
239		✗	dst += sizeof(start_sequence);
240		✗	memcpy(dst, src, nal_size);
241		✗	if (nal_counters)
242		✗	nal_counters[(*src) & nal_mask]++;
243		✗	dst += nal_size;
244			}
245			} else {
246		✗	av_log(ctx, AV_LOG_ERROR,
247			"nal size exceeds length: %d %d\n", nal_size, src_len);
248		✗	return AVERROR_INVALIDDATA;
249			}
250
251			// eat what we handled
252		✗	src += nal_size + skip_between;
253		✗	src_len -= nal_size + skip_between;
254			}
255
256		✗	if (pass == 0) {
257			/* now we know the total size of the packet (with the
258			* start sequences added) */
259		✗	if ((ret = av_new_packet(pkt, total_length)) < 0)
260		✗	return ret;
261		✗	dst = pkt->data;
262			}
263			}
264
265		✗	return 0;
266			}
267
268		✗	int ff_h264_handle_frag_packet(AVPacket *pkt, const uint8_t *buf, int len,
269			int start_bit, const uint8_t *nal_header,
270			int nal_header_len)
271			{
272			int ret;
273		✗	int tot_len = len;
274		✗	int pos = 0;
275		✗	if (start_bit)
276		✗	tot_len += sizeof(start_sequence) + nal_header_len;
277		✗	if ((ret = av_new_packet(pkt, tot_len)) < 0)
278		✗	return ret;
279		✗	if (start_bit) {
280		✗	memcpy(pkt->data + pos, start_sequence, sizeof(start_sequence));
281		✗	pos += sizeof(start_sequence);
282		✗	memcpy(pkt->data + pos, nal_header, nal_header_len);
283		✗	pos += nal_header_len;
284			}
285		✗	memcpy(pkt->data + pos, buf, len);
286		✗	return 0;
287			}
288
289		✗	static int h264_handle_packet_fu_a(AVFormatContext *ctx, PayloadContext *data, AVPacket *pkt,
290			const uint8_t *buf, int len,
291			int *nal_counters, int nal_mask)
292			{
293			uint8_t fu_indicator, fu_header, start_bit, nal_type, nal;
294
295		✗	if (len < 3) {
296		✗	av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H.264 RTP packet\n");
297		✗	return AVERROR_INVALIDDATA;
298			}
299
300		✗	fu_indicator = buf[0];
301		✗	fu_header = buf[1];
302		✗	start_bit = fu_header >> 7;
303		✗	nal_type = fu_header & 0x1f;
304		✗	nal = fu_indicator & 0xe0 | nal_type;
305
306			// skip the fu_indicator and fu_header
307		✗	buf += 2;
308		✗	len -= 2;
309
310		✗	if (start_bit && nal_counters)
311		✗	nal_counters[nal_type & nal_mask]++;
312		✗	return ff_h264_handle_frag_packet(pkt, buf, len, start_bit, &nal, 1);
313			}
314
315			// return 0 on packet, no more left, 1 on packet, 1 on partial packet
316		✗	static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,
317			AVStream *st, AVPacket *pkt, uint32_t *timestamp,
318			const uint8_t *buf, int len, uint16_t seq,
319			int flags)
320			{
321			uint8_t nal;
322			uint8_t type;
323		✗	int result = 0;
324
325		✗	if (!len) {
326		✗	av_log(ctx, AV_LOG_ERROR, "Empty H.264 RTP packet\n");
327		✗	return AVERROR_INVALIDDATA;
328			}
329		✗	nal = buf[0];
330		✗	type = nal & 0x1f;
331
332			/* Simplify the case (these are all the NAL types used internally by
333			* the H.264 codec). */
334		✗	if (type >= 1 && type <= 23)
335		✗	type = 1;
336		✗	switch (type) {
337		✗	case 0: // undefined, but pass them through
338			case 1:
339		✗	if ((result = av_new_packet(pkt, len + sizeof(start_sequence))) < 0)
340		✗	return result;
341		✗	memcpy(pkt->data, start_sequence, sizeof(start_sequence));
342		✗	memcpy(pkt->data + sizeof(start_sequence), buf, len);
343			COUNT_NAL_TYPE(data, nal);
344		✗	break;
345
346		✗	case 24: // STAP-A (one packet, multiple nals)
347			// consume the STAP-A NAL
348		✗	buf++;
349		✗	len--;
350		✗	result = ff_h264_handle_aggregated_packet(ctx, data, pkt, buf, len, 0,
351			NAL_COUNTERS, NAL_MASK);
352		✗	break;
353
354		✗	case 25: // STAP-B
355			case 26: // MTAP-16
356			case 27: // MTAP-24
357			case 29: // FU-B
358		✗	avpriv_report_missing_feature(ctx, "RTP H.264 NAL unit type %d", type);
359		✗	result = AVERROR_PATCHWELCOME;
360		✗	break;
361
362		✗	case 28: // FU-A (fragmented nal)
363		✗	result = h264_handle_packet_fu_a(ctx, data, pkt, buf, len,
364			NAL_COUNTERS, NAL_MASK);
365		✗	break;
366
367		✗	case 30: // undefined
368			case 31: // undefined
369			default:
370		✗	av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)\n", type);
371		✗	result = AVERROR_INVALIDDATA;
372		✗	break;
373			}
374
375		✗	pkt->stream_index = st->index;
376
377		✗	return result;
378			}
379
380		✗	static void h264_close_context(PayloadContext *data)
381			{
382			#ifdef DEBUG
383			int ii;
384
385			for (ii = 0; ii < 32; ii++) {
386			if (data->packet_types_received[ii])
387			av_log(NULL, AV_LOG_DEBUG, "Received %d packets of type %d\n",
388			data->packet_types_received[ii], ii);
389			}
390			#endif
391		✗	}
392
393		✗	static int parse_h264_sdp_line(AVFormatContext *s, int st_index,
394			PayloadContext *h264_data, const char *line)
395			{
396			AVStream *stream;
397		✗	const char *p = line;
398
399		✗	if (st_index < 0)
400		✗	return 0;
401
402		✗	stream = s->streams[st_index];
403
404		✗	if (av_strstart(p, "framesize:", &p)) {
405		✗	ff_h264_parse_framesize(stream->codecpar, p);
406		✗	} else if (av_strstart(p, "fmtp:", &p)) {
407		✗	return ff_parse_fmtp(s, stream, h264_data, p, sdp_parse_fmtp_config_h264);
408		✗	} else if (av_strstart(p, "cliprect:", &p)) {
409			// could use this if we wanted.
410			}
411
412		✗	return 0;
413			}
414
415			const RTPDynamicProtocolHandler ff_h264_dynamic_handler = {
416			.enc_name = "H264",
417			.codec_type = AVMEDIA_TYPE_VIDEO,
418			.codec_id = AV_CODEC_ID_H264,
419			.need_parsing = AVSTREAM_PARSE_FULL,
420			.priv_data_size = sizeof(PayloadContext),
421			.parse_sdp_a_line = parse_h264_sdp_line,
422			.close = h264_close_context,
423			.parse_packet = h264_handle_packet,
424			};
425