FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/remove_extradata_bsf.c
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 22 117 18.8%
Branches: 18 103 17.5%

Line Branch Exec Source
1 /*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "libavutil/log.h"
22 #include "libavutil/opt.h"
23
24 #include "av1_parse.h"
25 #include "bsf.h"
26 #include "bsf_internal.h"
27 #include "h264.h"
28 #include "hevc.h"
29 #include "internal.h"
30 #include "vc1_common.h"
31
32 enum RemoveFreq {
33 REMOVE_FREQ_KEYFRAME,
34 REMOVE_FREQ_ALL,
35 REMOVE_FREQ_NONKEYFRAME,
36 };
37
38 #define START_CODE 0x000001
39
40 typedef struct RemoveExtradataContext {
41 const AVClass *class;
42 int freq;
43 } RemoveExtradataContext;
44
45 static int av1_split(const uint8_t *buf, int buf_size, void *logctx)
46 {
47 AV1OBU obu;
48 const uint8_t *ptr = buf, *end = buf + buf_size;
49
50 while (ptr < end) {
51 int len = ff_av1_extract_obu(&obu, ptr, buf_size, logctx);
52 if (len < 0)
53 break;
54
55 if (obu.type == AV1_OBU_FRAME_HEADER ||
56 obu.type == AV1_OBU_FRAME) {
57 return ptr - buf;
58 }
59 ptr += len;
60 buf_size -= len;
61 }
62
63 return 0;
64 }
65
66 static int h264_split(const uint8_t *buf, int buf_size)
67 {
68 const uint8_t *ptr = buf, *end = buf + buf_size;
69 uint32_t state = -1;
70 int has_sps = 0;
71 int has_pps = 0;
72 int nalu_type;
73
74 while (ptr < end) {
75 ptr = avpriv_find_start_code(ptr, end, &state);
76 if ((state & 0xFFFFFF00) != 0x100)
77 break;
78 nalu_type = state & 0x1F;
79 if (nalu_type == H264_NAL_SPS) {
80 has_sps = 1;
81 } else if (nalu_type == H264_NAL_PPS)
82 has_pps = 1;
83 /* else if (nalu_type == 0x01 ||
84 * nalu_type == 0x02 ||
85 * nalu_type == 0x05) {
86 * }
87 */
88 else if ((nalu_type != H264_NAL_SEI || has_pps) &&
89 nalu_type != H264_NAL_AUD && nalu_type != H264_NAL_SPS_EXT &&
90 nalu_type != 0x0f) {
91 if (has_sps) {
92 while (ptr - 4 > buf && ptr[-5] == 0)
93 ptr--;
94 return ptr - 4 - buf;
95 }
96 }
97 }
98
99 return 0;
100 }
101
102 // Split after the parameter sets at the beginning of the stream if they exist.
103 static int hevc_split(const uint8_t *buf, int buf_size)
104 {
105 const uint8_t *ptr = buf, *end = buf + buf_size;
106 uint32_t state = -1;
107 int has_vps = 0;
108 int has_sps = 0;
109 int has_pps = 0;
110 int nut;
111
112 while (ptr < end) {
113 ptr = avpriv_find_start_code(ptr, end, &state);
114 if ((state >> 8) != START_CODE)
115 break;
116 nut = (state >> 1) & 0x3F;
117 if (nut == HEVC_NAL_VPS)
118 has_vps = 1;
119 else if (nut == HEVC_NAL_SPS)
120 has_sps = 1;
121 else if (nut == HEVC_NAL_PPS)
122 has_pps = 1;
123 else if ((nut != HEVC_NAL_SEI_PREFIX || has_pps) &&
124 nut != HEVC_NAL_AUD) {
125 if (has_vps && has_sps) {
126 while (ptr - 4 > buf && ptr[-5] == 0)
127 ptr--;
128 return ptr - 4 - buf;
129 }
130 }
131 }
132 return 0;
133 }
134
135 static int mpegvideo_split(const uint8_t *buf, int buf_size)
136 {
137 uint32_t state = -1;
138 int found = 0;
139
140 for (int i = 0; i < buf_size; i++) {
141 state = (state << 8) | buf[i];
142 if (state == 0x1B3) {
143 found = 1;
144 } else if (found && state != 0x1B5 && state < 0x200 && state >= 0x100)
145 return i - 3;
146 }
147 return 0;
148 }
149
150 50 static int mpeg4video_split(const uint8_t *buf, int buf_size)
151 {
152 50 const uint8_t *ptr = buf, *end = buf + buf_size;
153 50 uint32_t state = -1;
154
155
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74 while (ptr < end) {
156 74 ptr = avpriv_find_start_code(ptr, end, &state);
157
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74 if (state == 0x1B3 || state == 0x1B6)
158 50 return ptr - 4 - buf;
159 }
160
161 return 0;
162 }
163
164 static int vc1_split(const uint8_t *buf, int buf_size)
165 {
166 const uint8_t *ptr = buf, *end = buf + buf_size;
167 uint32_t state = -1;
168 int charged = 0;
169
170 while (ptr < end) {
171 ptr = avpriv_find_start_code(ptr, end, &state);
172 if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
173 charged = 1;
174 } else if (charged && IS_MARKER(state))
175 return ptr - 4 - buf;
176 }
177
178 return 0;
179 }
180
181 153 static int remove_extradata(AVBSFContext *ctx, AVPacket *pkt)
182 {
183 153 RemoveExtradataContext *s = ctx->priv_data;
184
185 int ret;
186
187 153 ret = ff_bsf_get_packet_ref(ctx, pkt);
188
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153 if (ret < 0)
189 78 return ret;
190
191
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75 if (s->freq == REMOVE_FREQ_ALL ||
192
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50 (s->freq == REMOVE_FREQ_NONKEYFRAME && !(pkt->flags & AV_PKT_FLAG_KEY)) ||
193
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28 (s->freq == REMOVE_FREQ_KEYFRAME && pkt->flags & AV_PKT_FLAG_KEY)) {
194 int i;
195
196
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50 switch (ctx->par_in->codec_id) {
197 case AV_CODEC_ID_AV1:
198 i = av1_split(pkt->data, pkt->size, ctx);
199 break;
200 50 case AV_CODEC_ID_AVS2:
201 case AV_CODEC_ID_AVS3:
202 case AV_CODEC_ID_CAVS:
203 case AV_CODEC_ID_MPEG4:
204 50 i = mpeg4video_split(pkt->data, pkt->size);
205 50 break;
206 case AV_CODEC_ID_H264:
207 i = h264_split(pkt->data, pkt->size);
208 break;
209 case AV_CODEC_ID_HEVC:
210 i = hevc_split(pkt->data, pkt->size);
211 break;
212 case AV_CODEC_ID_MPEG1VIDEO:
213 case AV_CODEC_ID_MPEG2VIDEO:
214 i = mpegvideo_split(pkt->data, pkt->size);
215 break;
216 case AV_CODEC_ID_VC1:
217 i = vc1_split(pkt->data, pkt->size);
218 break;
219 default:
220 i = 0;
221 }
222
223 50 pkt->data += i;
224 50 pkt->size -= i;
225 }
226
227 75 return 0;
228 }
229
230 #define OFFSET(x) offsetof(RemoveExtradataContext, x)
231 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
232 static const AVOption options[] = {
233 { "freq", NULL, OFFSET(freq), AV_OPT_TYPE_INT, { .i64 = REMOVE_FREQ_KEYFRAME }, REMOVE_FREQ_KEYFRAME, REMOVE_FREQ_NONKEYFRAME, FLAGS, "freq" },
234 { "k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_NONKEYFRAME }, .flags = FLAGS, .unit = "freq" },
235 { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
236 { "e", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
237 { "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
238 { NULL },
239 };
240
241 static const AVClass remove_extradata_class = {
242 .class_name = "remove_extradata",
243 .item_name = av_default_item_name,
244 .option = options,
245 .version = LIBAVUTIL_VERSION_INT,
246 };
247
248 const AVBitStreamFilter ff_remove_extradata_bsf = {
249 .name = "remove_extra",
250 .priv_data_size = sizeof(RemoveExtradataContext),
251 .priv_class = &remove_extradata_class,
252 .filter = remove_extradata,
253 };
254