FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/filter_units_bsf.c
Date: 2021-09-22 23:55:11
Exec Total Coverage
Lines: 0 103 0.0%
Branches: 0 64 0.0%

Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdlib.h>
20
21 #include "libavutil/common.h"
22 #include "libavutil/opt.h"
23
24 #include "bsf.h"
25 #include "bsf_internal.h"
26 #include "cbs.h"
27
28
29 typedef struct FilterUnitsContext {
30 const AVClass *class;
31
32 CodedBitstreamContext *cbc;
33 CodedBitstreamFragment fragment;
34
35 const char *pass_types;
36 const char *remove_types;
37
38 enum {
39 NOOP,
40 PASS,
41 REMOVE,
42 } mode;
43 CodedBitstreamUnitType *type_list;
44 int nb_types;
45 } FilterUnitsContext;
46
47
48 static int filter_units_make_type_list(const char *list_string,
49 CodedBitstreamUnitType **type_list,
50 int *nb_types)
51 {
52 CodedBitstreamUnitType *list = NULL;
53 int pass, count;
54
55 for (pass = 1; pass <= 2; pass++) {
56 long value, range_start, range_end;
57 const char *str;
58 char *value_end;
59
60 count = 0;
61 for (str = list_string; *str;) {
62 value = strtol(str, &value_end, 0);
63 if (str == value_end)
64 goto invalid;
65 str = (const char *)value_end;
66 if (*str == '-') {
67 ++str;
68 range_start = value;
69 range_end = strtol(str, &value_end, 0);
70 if (str == value_end)
71 goto invalid;
72
73 for (value = range_start; value < range_end; value++) {
74 if (pass == 2)
75 list[count] = value;
76 ++count;
77 }
78 } else {
79 if (pass == 2)
80 list[count] = value;
81 ++count;
82 }
83 if (*str == '|')
84 ++str;
85 }
86 if (pass == 1) {
87 list = av_malloc_array(count, sizeof(*list));
88 if (!list)
89 return AVERROR(ENOMEM);
90 }
91 }
92
93 *type_list = list;
94 *nb_types = count;
95 return 0;
96
97 invalid:
98 av_freep(&list);
99 return AVERROR(EINVAL);
100 }
101
102 static int filter_units_filter(AVBSFContext *bsf, AVPacket *pkt)
103 {
104 FilterUnitsContext *ctx = bsf->priv_data;
105 CodedBitstreamFragment *frag = &ctx->fragment;
106 int err, i, j;
107
108 err = ff_bsf_get_packet_ref(bsf, pkt);
109 if (err < 0)
110 return err;
111
112 if (ctx->mode == NOOP)
113 return 0;
114
115 err = ff_cbs_read_packet(ctx->cbc, frag, pkt);
116 if (err < 0) {
117 av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
118 goto fail;
119 }
120
121 for (i = frag->nb_units - 1; i >= 0; i--) {
122 for (j = 0; j < ctx->nb_types; j++) {
123 if (frag->units[i].type == ctx->type_list[j])
124 break;
125 }
126 if (ctx->mode == REMOVE ? j < ctx->nb_types
127 : j >= ctx->nb_types)
128 ff_cbs_delete_unit(frag, i);
129 }
130
131 if (frag->nb_units == 0) {
132 // Don't return packets with nothing in them.
133 err = AVERROR(EAGAIN);
134 goto fail;
135 }
136
137 err = ff_cbs_write_packet(ctx->cbc, pkt, frag);
138 if (err < 0) {
139 av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
140 goto fail;
141 }
142
143 fail:
144 if (err < 0)
145 av_packet_unref(pkt);
146 ff_cbs_fragment_reset(frag);
147
148 return err;
149 }
150
151 static int filter_units_init(AVBSFContext *bsf)
152 {
153 FilterUnitsContext *ctx = bsf->priv_data;
154 int err;
155
156 if (ctx->pass_types && ctx->remove_types) {
157 av_log(bsf, AV_LOG_ERROR, "Exactly one of pass_types or "
158 "remove_types is required.\n");
159 return AVERROR(EINVAL);
160 }
161
162 if (ctx->pass_types) {
163 ctx->mode = PASS;
164 err = filter_units_make_type_list(ctx->pass_types,
165 &ctx->type_list, &ctx->nb_types);
166 if (err < 0) {
167 av_log(bsf, AV_LOG_ERROR, "Failed to parse pass_types.\n");
168 return err;
169 }
170 } else if (ctx->remove_types) {
171 ctx->mode = REMOVE;
172 err = filter_units_make_type_list(ctx->remove_types,
173 &ctx->type_list, &ctx->nb_types);
174 if (err < 0) {
175 av_log(bsf, AV_LOG_ERROR, "Failed to parse remove_types.\n");
176 return err;
177 }
178 } else {
179 return 0;
180 }
181
182 err = ff_cbs_init(&ctx->cbc, bsf->par_in->codec_id, bsf);
183 if (err < 0)
184 return err;
185
186 // Don't actually decompose anything, we only want the unit data.
187 ctx->cbc->decompose_unit_types = ctx->type_list;
188 ctx->cbc->nb_decompose_unit_types = 0;
189
190 if (bsf->par_in->extradata) {
191 CodedBitstreamFragment *frag = &ctx->fragment;
192
193 err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
194 if (err < 0) {
195 av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
196 } else {
197 err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
198 if (err < 0)
199 av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
200 }
201
202 ff_cbs_fragment_reset(frag);
203 }
204
205 return err;
206 }
207
208 static void filter_units_close(AVBSFContext *bsf)
209 {
210 FilterUnitsContext *ctx = bsf->priv_data;
211
212 av_freep(&ctx->type_list);
213
214 ff_cbs_fragment_free(&ctx->fragment);
215 ff_cbs_close(&ctx->cbc);
216 }
217
218 #define OFFSET(x) offsetof(FilterUnitsContext, x)
219 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
220 static const AVOption filter_units_options[] = {
221 { "pass_types", "List of unit types to pass through the filter.",
222 OFFSET(pass_types), AV_OPT_TYPE_STRING,
223 { .str = NULL }, .flags = FLAGS },
224 { "remove_types", "List of unit types to remove in the filter.",
225 OFFSET(remove_types), AV_OPT_TYPE_STRING,
226 { .str = NULL }, .flags = FLAGS },
227
228 { NULL }
229 };
230
231 static const AVClass filter_units_class = {
232 .class_name = "filter_units",
233 .item_name = av_default_item_name,
234 .option = filter_units_options,
235 .version = LIBAVUTIL_VERSION_INT,
236 };
237
238 const AVBitStreamFilter ff_filter_units_bsf = {
239 .name = "filter_units",
240 .priv_data_size = sizeof(FilterUnitsContext),
241 .priv_class = &filter_units_class,
242 .init = &filter_units_init,
243 .close = &filter_units_close,
244 .filter = &filter_units_filter,
245 .codec_ids = ff_cbs_all_codec_ids,
246 };
247