FFmpeg  4.2.3
filter_units_bsf.c
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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 "cbs.h"
26 
27 
28 typedef struct FilterUnitsContext {
29  const AVClass *class;
30 
33 
34  const char *pass_types;
35  const char *remove_types;
36 
37  enum {
41  } mode;
43  int nb_types;
45 
46 
47 static int filter_units_make_type_list(const char *list_string,
49  int *nb_types)
50 {
52  int pass, count;
53 
54  for (pass = 1; pass <= 2; pass++) {
55  long value, range_start, range_end;
56  const char *str;
57  char *value_end;
58 
59  count = 0;
60  for (str = list_string; *str;) {
61  value = strtol(str, &value_end, 0);
62  if (str == value_end)
63  goto invalid;
64  str = (const char *)value_end;
65  if (*str == '-') {
66  ++str;
67  range_start = value;
68  range_end = strtol(str, &value_end, 0);
69  if (str == value_end)
70  goto invalid;
71 
72  for (value = range_start; value < range_end; value++) {
73  if (pass == 2)
74  list[count] = value;
75  ++count;
76  }
77  } else {
78  if (pass == 2)
79  list[count] = value;
80  ++count;
81  }
82  if (*str == '|')
83  ++str;
84  }
85  if (pass == 1) {
86  list = av_malloc_array(count, sizeof(*list));
87  if (!list)
88  return AVERROR(ENOMEM);
89  }
90  }
91 
92  *type_list = list;
93  *nb_types = count;
94  return 0;
95 
96 invalid:
97  av_freep(&list);
98  return AVERROR(EINVAL);
99 }
100 
102 {
104  CodedBitstreamFragment *frag = &ctx->fragment;
105  int err, i, j;
106 
107  err = ff_bsf_get_packet_ref(bsf, pkt);
108  if (err < 0)
109  return err;
110 
111  if (ctx->mode == NOOP)
112  return 0;
113 
114  err = ff_cbs_read_packet(ctx->cbc, frag, pkt);
115  if (err < 0) {
116  av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
117  goto fail;
118  }
119 
120  for (i = frag->nb_units - 1; i >= 0; i--) {
121  for (j = 0; j < ctx->nb_types; j++) {
122  if (frag->units[i].type == ctx->type_list[j])
123  break;
124  }
125  if (ctx->mode == REMOVE ? j < ctx->nb_types
126  : j >= ctx->nb_types)
127  ff_cbs_delete_unit(ctx->cbc, frag, i);
128  }
129 
130  if (frag->nb_units == 0) {
131  // Don't return packets with nothing in them.
132  err = AVERROR(EAGAIN);
133  goto fail;
134  }
135 
136  err = ff_cbs_write_packet(ctx->cbc, pkt, frag);
137  if (err < 0) {
138  av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
139  goto fail;
140  }
141 
142 fail:
143  if (err < 0)
144  av_packet_unref(pkt);
145  ff_cbs_fragment_reset(ctx->cbc, frag);
146 
147  return err;
148 }
149 
151 {
153  int err;
154 
155  if (ctx->pass_types && ctx->remove_types) {
156  av_log(bsf, AV_LOG_ERROR, "Exactly one of pass_types or "
157  "remove_types is required.\n");
158  return AVERROR(EINVAL);
159  }
160 
161  if (ctx->pass_types) {
162  ctx->mode = PASS;
164  &ctx->type_list, &ctx->nb_types);
165  if (err < 0) {
166  av_log(bsf, AV_LOG_ERROR, "Failed to parse pass_types.\n");
167  return err;
168  }
169  } else if (ctx->remove_types) {
170  ctx->mode = REMOVE;
172  &ctx->type_list, &ctx->nb_types);
173  if (err < 0) {
174  av_log(bsf, AV_LOG_ERROR, "Failed to parse remove_types.\n");
175  return err;
176  }
177  } else {
178  return 0;
179  }
180 
181  err = ff_cbs_init(&ctx->cbc, bsf->par_in->codec_id, bsf);
182  if (err < 0)
183  return err;
184 
185  // Don't actually decompose anything, we only want the unit data.
186  ctx->cbc->decompose_unit_types = ctx->type_list;
187  ctx->cbc->nb_decompose_unit_types = 0;
188 
189  if (bsf->par_in->extradata) {
190  CodedBitstreamFragment *frag = &ctx->fragment;
191 
192  err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
193  if (err < 0) {
194  av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
195  } else {
196  err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
197  if (err < 0)
198  av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
199  }
200 
201  ff_cbs_fragment_reset(ctx->cbc, frag);
202  }
203 
204  return err;
205 }
206 
208 {
210 
211  av_freep(&ctx->type_list);
212 
213  ff_cbs_fragment_free(ctx->cbc, &ctx->fragment);
214  ff_cbs_close(&ctx->cbc);
215 }
216 
217 #define OFFSET(x) offsetof(FilterUnitsContext, x)
218 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
219 static const AVOption filter_units_options[] = {
220  { "pass_types", "List of unit types to pass through the filter.",
222  { .str = NULL }, .flags = FLAGS },
223  { "remove_types", "List of unit types to remove in the filter.",
225  { .str = NULL }, .flags = FLAGS },
226 
227  { NULL }
228 };
229 
230 static const AVClass filter_units_class = {
231  .class_name = "filter_units",
232  .item_name = av_default_item_name,
233  .option = filter_units_options,
234  .version = LIBAVUTIL_VERSION_INT,
235 };
236 
238  .name = "filter_units",
239  .priv_data_size = sizeof(FilterUnitsContext),
240  .priv_class = &filter_units_class,
242  .close = &filter_units_close,
245 };
#define NULL
Definition: coverity.c:32
int nb_units
Number of units in this fragment.
Definition: cbs.h:147
AVCodecParameters * par_out
Parameters of the output stream.
Definition: avcodec.h:5797
static const AVClass filter_units_class
AVOption.
Definition: opt.h:246
const char * pass_types
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int ff_cbs_write_packet(CodedBitstreamContext *ctx, AVPacket *pkt, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to a packet.
Definition: cbs.c:401
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int ff_cbs_init(CodedBitstreamContext **ctx_ptr, enum AVCodecID codec_id, void *log_ctx)
Create and initialise a new context for the given codec.
Definition: cbs.c:74
void ff_cbs_delete_unit(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, int position)
Delete a unit from a fragment and free all memory it uses.
Definition: cbs.c:796
CodedBitstreamUnitType type
Codec-specific type of this unit.
Definition: cbs.h:68
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3957
The bitstream filter state.
Definition: avcodec.h:5763
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
CodedBitstreamContext * cbc
static AVPacket pkt
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5784
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, int clip)
Definition: cfhd.c:153
AVOptions.
uint32_t CodedBitstreamUnitType
The codec-specific type of a bitstream unit.
Definition: cbs.h:43
int ff_cbs_read_packet(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVPacket *pkt)
Read the data bitstream from a packet into a fragment, then split into units and decompose.
Definition: cbs.c:242
const char * name
Definition: avcodec.h:5813
CodedBitstreamUnit * units
Pointer to an array of units of length nb_units_allocated.
Definition: cbs.h:162
#define av_log(a,...)
void ff_cbs_fragment_free(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Free the units array of a fragment in addition to what ff_cbs_fragment_reset does.
Definition: cbs.c:157
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
static int filter_units_init(AVBSFContext *bsf)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
static void filter_units_close(AVBSFContext *bsf)
#define fail()
Definition: checkasm.h:120
#define pass
Definition: fft_template.c:619
static int filter_units_filter(AVBSFContext *bsf, AVPacket *pkt)
int ff_cbs_write_extradata(CodedBitstreamContext *ctx, AVCodecParameters *par, CodedBitstreamFragment *frag)
Write the bitstream of a fragment to the extradata in codec parameters.
Definition: cbs.c:376
const char * remove_types
AVFormatContext * ctx
Definition: movenc.c:48
enum FilterUnitsContext::@80 mode
int nb_decompose_unit_types
Length of the decompose_unit_types array.
Definition: cbs.h:201
Coded bitstream fragment structure, combining one or more units.
Definition: cbs.h:116
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:599
CodedBitstreamUnitType * type_list
double value
Definition: eval.c:98
const AVBitStreamFilter ff_filter_units_bsf
Describe the class of an AVClass context structure.
Definition: log.h:67
void ff_cbs_fragment_reset(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag)
Free the units contained in a fragment as well as the fragment&#39;s own data buffer, but not the units a...
Definition: cbs.c:142
Context structure for coded bitstream operations.
Definition: cbs.h:168
void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
Close a context and free all internal state.
Definition: cbs.c:115
#define FLAGS
int ff_cbs_read_extradata(CodedBitstreamContext *ctx, CodedBitstreamFragment *frag, const AVCodecParameters *par)
Read the extradata bitstream found in codec parameters into a fragment, then split into units and dec...
Definition: cbs.c:224
CodedBitstreamFragment fragment
common internal and external API header
static enum AVCodecID codec_ids[]
CodedBitstreamUnitType * decompose_unit_types
Array of unit types which should be decomposed when reading.
Definition: cbs.h:197
enum AVCodecID ff_cbs_all_codec_ids[]
Table of all supported codec IDs.
Definition: cbs.c:52
static const AVOption filter_units_options[]
#define OFFSET(x)
static int filter_units_make_type_list(const char *list_string, CodedBitstreamUnitType **type_list, int *nb_types)
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3971
#define av_freep(p)
void INT64 INT64 count
Definition: avisynth_c.h:766
#define av_malloc_array(a, b)
This structure stores compressed data.
Definition: avcodec.h:1454
AVCodecParameters * par_in
Parameters of the input stream.
Definition: avcodec.h:5791
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:239