FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* RTP packetization for H.264 (RFC3984)
3			* RTP packetizer for HEVC/H.265 payload format (draft version 6)
4			* Copyright (c) 2008 Luca Abeni
5			* Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com>
6			*
7			* This file is part of FFmpeg.
8			*
9			* FFmpeg is free software; you can redistribute it and/or
10			* modify it under the terms of the GNU Lesser General Public
11			* License as published by the Free Software Foundation; either
12			* version 2.1 of the License, or (at your option) any later version.
13			*
14			* FFmpeg is distributed in the hope that it will be useful,
15			* but WITHOUT ANY WARRANTY; without even the implied warranty of
16			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17			* Lesser General Public License for more details.
18			*
19			* You should have received a copy of the GNU Lesser General Public
20			* License along with FFmpeg; if not, write to the Free Software
21			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22			*/
23
24			/**
25			* @file
26			* @brief H.264/HEVC packetization
27			* @author Luca Abeni <lucabe72@email.it>
28			*/
29
30			#include "libavutil/intreadwrite.h"
31
32			#include "avformat.h"
33			#include "avc.h"
34			#include "nal.h"
35			#include "rtpenc.h"
36
37		✗	static void flush_buffered(AVFormatContext *s1, int last)
38			{
39		✗	RTPMuxContext *s = s1->priv_data;
40		✗	if (s->buf_ptr != s->buf) {
41			// If we're only sending one single NAL unit, send it as such, skip
42			// the STAP-A/AP framing
43		✗	if (s->buffered_nals == 1) {
44		✗	enum AVCodecID codec = s1->streams[0]->codecpar->codec_id;
45		✗	if (codec == AV_CODEC_ID_H264)
46		✗	ff_rtp_send_data(s1, s->buf + 3, s->buf_ptr - s->buf - 3, last);
47			else
48		✗	ff_rtp_send_data(s1, s->buf + 4, s->buf_ptr - s->buf - 4, last);
49			} else
50		✗	ff_rtp_send_data(s1, s->buf, s->buf_ptr - s->buf, last);
51			}
52		✗	s->buf_ptr = s->buf;
53		✗	s->buffered_nals = 0;
54		✗	}
55
56		✗	static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)
57			{
58		✗	RTPMuxContext *s = s1->priv_data;
59		✗	enum AVCodecID codec = s1->streams[0]->codecpar->codec_id;
60
61		✗	av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last);
62		✗	if (size <= s->max_payload_size) {
63		✗	int buffered_size = s->buf_ptr - s->buf;
64			int header_size;
65		✗	int skip_aggregate = 0;
66
67		✗	if (codec == AV_CODEC_ID_H264) {
68		✗	header_size = 1;
69		✗	skip_aggregate = s->flags & FF_RTP_FLAG_H264_MODE0;
70			} else {
71		✗	header_size = 2;
72			}
73
74			// Flush buffered NAL units if the current unit doesn't fit
75		✗	if (buffered_size + 2 + size > s->max_payload_size) {
76		✗	flush_buffered(s1, 0);
77		✗	buffered_size = 0;
78			}
79			// If we aren't using mode 0, and the NAL unit fits including the
80			// framing (2 bytes length, plus 1/2 bytes for the STAP-A/AP marker),
81			// write the unit to the buffer as a STAP-A/AP packet, otherwise flush
82			// and send as single NAL.
83		✗	if (buffered_size + 2 + header_size + size <= s->max_payload_size &&
84			!skip_aggregate) {
85		✗	if (buffered_size == 0) {
86		✗	if (codec == AV_CODEC_ID_H264) {
87		✗	*s->buf_ptr++ = 24;
88			} else {
89		✗	*s->buf_ptr++ = 48 << 1;
90		✗	*s->buf_ptr++ = 1;
91			}
92			}
93		✗	AV_WB16(s->buf_ptr, size);
94		✗	s->buf_ptr += 2;
95		✗	memcpy(s->buf_ptr, buf, size);
96		✗	s->buf_ptr += size;
97		✗	s->buffered_nals++;
98			} else {
99		✗	flush_buffered(s1, 0);
100		✗	ff_rtp_send_data(s1, buf, size, last);
101			}
102			} else {
103			int flag_byte, header_size;
104		✗	flush_buffered(s1, 0);
105		✗	if (codec == AV_CODEC_ID_H264 && (s->flags & FF_RTP_FLAG_H264_MODE0)) {
106		✗	av_log(s1, AV_LOG_ERROR,
107			"NAL size %d > %d, try -slice-max-size %d\n", size,
108			s->max_payload_size, s->max_payload_size);
109		✗	return;
110			}
111		✗	av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size);
112		✗	if (codec == AV_CODEC_ID_H264) {
113		✗	uint8_t type = buf[0] & 0x1F;
114		✗	uint8_t nri = buf[0] & 0x60;
115
116		✗	s->buf[0] = 28; /* FU Indicator; Type = 28 ---> FU-A */
117		✗	s->buf[0] |= nri;
118		✗	s->buf[1] = type;
119		✗	s->buf[1] |= 1 << 7;
120		✗	buf += 1;
121		✗	size -= 1;
122
123		✗	flag_byte = 1;
124		✗	header_size = 2;
125			} else {
126		✗	uint8_t nal_type = (buf[0] >> 1) & 0x3F;
127			/*
128			* create the HEVC payload header and transmit the buffer as fragmentation units (FU)
129			*
130			* 0 1
131			* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
132			* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
133			* |F| Type | LayerId | TID |
134			* +-------------+-----------------+
135			*
136			* F = 0
137			* Type = 49 (fragmentation unit (FU))
138			* LayerId = 0
139			* TID = 1
140			*/
141		✗	s->buf[0] = 49 << 1;
142		✗	s->buf[1] = 1;
143
144			/*
145			* create the FU header
146			*
147			* 0 1 2 3 4 5 6 7
148			* +-+-+-+-+-+-+-+-+
149			* |S|E| FuType |
150			* +---------------+
151			*
152			* S = variable
153			* E = variable
154			* FuType = NAL unit type
155			*/
156		✗	s->buf[2] = nal_type;
157			/* set the S bit: mark as start fragment */
158		✗	s->buf[2] |= 1 << 7;
159
160			/* pass the original NAL header */
161		✗	buf += 2;
162		✗	size -= 2;
163
164		✗	flag_byte = 2;
165		✗	header_size = 3;
166			}
167
168		✗	while (size + header_size > s->max_payload_size) {
169		✗	memcpy(&s->buf[header_size], buf, s->max_payload_size - header_size);
170		✗	ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0);
171		✗	buf += s->max_payload_size - header_size;
172		✗	size -= s->max_payload_size - header_size;
173		✗	s->buf[flag_byte] &= ~(1 << 7);
174			}
175		✗	s->buf[flag_byte] |= 1 << 6;
176		✗	memcpy(&s->buf[header_size], buf, size);
177		✗	ff_rtp_send_data(s1, s->buf, size + header_size, last);
178			}
179			}
180
181		✗	void ff_rtp_send_h264_hevc(AVFormatContext *s1, const uint8_t *buf1, int size)
182			{
183		✗	const uint8_t *r, *end = buf1 + size;
184		✗	RTPMuxContext *s = s1->priv_data;
185
186		✗	s->timestamp = s->cur_timestamp;
187		✗	s->buf_ptr = s->buf;
188		✗	if (s->nal_length_size)
189		✗	r = ff_nal_mp4_find_startcode(buf1, end, s->nal_length_size) ? buf1 : end;
190			else
191		✗	r = ff_nal_find_startcode(buf1, end);
192		✗	while (r < end) {
193			const uint8_t *r1;
194
195		✗	if (s->nal_length_size) {
196		✗	r1 = ff_nal_mp4_find_startcode(r, end, s->nal_length_size);
197		✗	if (!r1)
198		✗	r1 = end;
199			// Check that the last is not truncated
200		✗	if (r1 - r < s->nal_length_size)
201		✗	break;
202		✗	r += s->nal_length_size;
203			} else {
204		✗	while (!*(r++));
205		✗	r1 = ff_nal_find_startcode(r, end);
206			}
207		✗	nal_send(s1, r, r1 - r, r1 == end);
208		✗	r = r1;
209			}
210		✗	flush_buffered(s1, 1);
211		✗	}
212