FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/rtpenc_h264_hevc.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 0 93 0.0%
Functions: 0 3 0.0%
Branches: 0 40 0.0%
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 ✗ r += s->nal_length_size;
200 } else {
201 ✗ while (!*(r++));
202 ✗ r1 = ff_nal_find_startcode(r, end);
203 }
204 ✗ nal_send(s1, r, r1 - r, r1 == end);
205 ✗ r = r1;
206 }
207 ✗ flush_buffered(s1, 1);
208 ✗ }
209