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path: root/libavcodec/extract_extradata_bsf.c (plain)
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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 <stdint.h>
20
21#include "libavutil/common.h"
22#include "libavutil/intreadwrite.h"
23#include "libavutil/log.h"
24#include "libavutil/opt.h"
25
26#include "avcodec.h"
27#include "bsf.h"
28#include "h2645_parse.h"
29#include "h264.h"
30#include "hevc.h"
31#include "vc1_common.h"
32
33typedef struct ExtractExtradataContext {
34 const AVClass *class;
35
36 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
37 uint8_t **data, int *size);
38
39 /* AVOptions */
40 int remove;
41} ExtractExtradataContext;
42
43static int val_in_array(const int *arr, int len, int val)
44{
45 int i;
46 for (i = 0; i < len; i++)
47 if (arr[i] == val)
48 return 1;
49 return 0;
50}
51
52static int extract_extradata_h2645(AVBSFContext *ctx, AVPacket *pkt,
53 uint8_t **data, int *size)
54{
55 static const int extradata_nal_types_hevc[] = {
56 HEVC_NAL_VPS, HEVC_NAL_SPS, HEVC_NAL_PPS,
57 };
58 static const int extradata_nal_types_h264[] = {
59 H264_NAL_SPS, H264_NAL_PPS,
60 };
61
62 ExtractExtradataContext *s = ctx->priv_data;
63
64 H2645Packet h2645_pkt = { 0 };
65 int extradata_size = 0;
66 const int *extradata_nal_types;
67 int nb_extradata_nal_types;
68 int i, has_sps = 0, has_vps = 0, ret = 0;
69
70 if (ctx->par_in->codec_id == AV_CODEC_ID_HEVC) {
71 extradata_nal_types = extradata_nal_types_hevc;
72 nb_extradata_nal_types = FF_ARRAY_ELEMS(extradata_nal_types_hevc);
73 } else {
74 extradata_nal_types = extradata_nal_types_h264;
75 nb_extradata_nal_types = FF_ARRAY_ELEMS(extradata_nal_types_h264);
76 }
77
78 ret = ff_h2645_packet_split(&h2645_pkt, pkt->data, pkt->size,
79 ctx, 0, 0, ctx->par_in->codec_id, 1);
80 if (ret < 0)
81 return ret;
82
83 for (i = 0; i < h2645_pkt.nb_nals; i++) {
84 H2645NAL *nal = &h2645_pkt.nals[i];
85 if (val_in_array(extradata_nal_types, nb_extradata_nal_types, nal->type)) {
86 extradata_size += nal->raw_size + 3;
87 if (ctx->par_in->codec_id == AV_CODEC_ID_HEVC) {
88 if (nal->type == HEVC_NAL_SPS) has_sps = 1;
89 if (nal->type == HEVC_NAL_VPS) has_vps = 1;
90 } else {
91 if (nal->type == H264_NAL_SPS) has_sps = 1;
92 }
93 }
94 }
95
96 if (extradata_size &&
97 ((ctx->par_in->codec_id == AV_CODEC_ID_HEVC && has_sps && has_vps) ||
98 (ctx->par_in->codec_id == AV_CODEC_ID_H264 && has_sps))) {
99 AVBufferRef *filtered_buf;
100 uint8_t *extradata, *filtered_data;
101
102 if (s->remove) {
103 filtered_buf = av_buffer_alloc(pkt->size + AV_INPUT_BUFFER_PADDING_SIZE);
104 if (!filtered_buf)
105 goto fail;
106 filtered_data = filtered_buf->data;
107 }
108
109 extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
110 if (!extradata) {
111 av_buffer_unref(&filtered_buf);
112 goto fail;
113 }
114
115 *data = extradata;
116 *size = extradata_size;
117
118 for (i = 0; i < h2645_pkt.nb_nals; i++) {
119 H2645NAL *nal = &h2645_pkt.nals[i];
120 if (val_in_array(extradata_nal_types, nb_extradata_nal_types,
121 nal->type)) {
122 AV_WB24(extradata, 1); // startcode
123 memcpy(extradata + 3, nal->raw_data, nal->raw_size);
124 extradata += 3 + nal->raw_size;
125 } else if (s->remove) {
126 AV_WB24(filtered_data, 1); // startcode
127 memcpy(filtered_data + 3, nal->raw_data, nal->raw_size);
128 filtered_data += 3 + nal->raw_size;
129 }
130 }
131
132 if (s->remove) {
133 av_buffer_unref(&pkt->buf);
134 pkt->buf = filtered_buf;
135 pkt->data = filtered_buf->data;
136 pkt->size = filtered_data - filtered_buf->data;
137 }
138 }
139
140fail:
141 ff_h2645_packet_uninit(&h2645_pkt);
142 return ret;
143}
144
145static int extract_extradata_vc1(AVBSFContext *ctx, AVPacket *pkt,
146 uint8_t **data, int *size)
147{
148 ExtractExtradataContext *s = ctx->priv_data;
149 const uint8_t *ptr = pkt->data, *end = pkt->data + pkt->size;
150 uint32_t state = UINT32_MAX;
151 int has_extradata = 0, extradata_size = 0;
152
153 while (ptr < end) {
154 ptr = avpriv_find_start_code(ptr, end, &state);
155 if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
156 has_extradata = 1;
157 } else if (has_extradata && IS_MARKER(state)) {
158 extradata_size = ptr - 4 - pkt->data;
159 break;
160 }
161 }
162
163 if (extradata_size) {
164 *data = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
165 if (!*data)
166 return AVERROR(ENOMEM);
167
168 memcpy(*data, pkt->data, extradata_size);
169 *size = extradata_size;
170
171 if (s->remove) {
172 pkt->data += extradata_size;
173 pkt->size -= extradata_size;
174 }
175 }
176
177 return 0;
178}
179
180static int extract_extradata_mpeg12(AVBSFContext *ctx, AVPacket *pkt,
181 uint8_t **data, int *size)
182{
183 ExtractExtradataContext *s = ctx->priv_data;
184 uint32_t state = UINT32_MAX;
185 int i, found = 0;
186
187 for (i = 0; i < pkt->size; i++) {
188 state = (state << 8) | pkt->data[i];
189 if (state == 0x1B3)
190 found = 1;
191 else if (found && state != 0x1B5 && state < 0x200 && state >= 0x100) {
192 if (i > 3) {
193 *size = i - 3;
194 *data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
195 if (!*data)
196 return AVERROR(ENOMEM);
197
198 memcpy(*data, pkt->data, *size);
199
200 if (s->remove) {
201 pkt->data += *size;
202 pkt->size -= *size;
203 }
204 }
205 break;
206 }
207 }
208 return 0;
209}
210
211static int extract_extradata_mpeg4(AVBSFContext *ctx, AVPacket *pkt,
212 uint8_t **data, int *size)
213{
214 ExtractExtradataContext *s = ctx->priv_data;
215 const uint8_t *ptr = pkt->data, *end = pkt->data + pkt->size;
216 uint32_t state = UINT32_MAX;
217
218 while (ptr < end) {
219 ptr = avpriv_find_start_code(ptr, end, &state);
220 if (state == 0x1B3 || state == 0x1B6) {
221 if (ptr - pkt->data > 4) {
222 *size = ptr - 4 - pkt->data;
223 *data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
224 if (!*data)
225 return AVERROR(ENOMEM);
226
227 memcpy(*data, pkt->data, *size);
228
229 if (s->remove) {
230 pkt->data += *size;
231 pkt->size -= *size;
232 }
233 }
234 break;
235 }
236 }
237 return 0;
238}
239
240static const struct {
241 enum AVCodecID id;
242 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
243 uint8_t **data, int *size);
244} extract_tab[] = {
245 { AV_CODEC_ID_CAVS, extract_extradata_mpeg4 },
246 { AV_CODEC_ID_H264, extract_extradata_h2645 },
247 { AV_CODEC_ID_HEVC, extract_extradata_h2645 },
248 { AV_CODEC_ID_MPEG1VIDEO, extract_extradata_mpeg12 },
249 { AV_CODEC_ID_MPEG2VIDEO, extract_extradata_mpeg12 },
250 { AV_CODEC_ID_MPEG4, extract_extradata_mpeg4 },
251 { AV_CODEC_ID_VC1, extract_extradata_vc1 },
252};
253
254static int extract_extradata_init(AVBSFContext *ctx)
255{
256 ExtractExtradataContext *s = ctx->priv_data;
257 int i;
258
259 for (i = 0; i < FF_ARRAY_ELEMS(extract_tab); i++) {
260 if (extract_tab[i].id == ctx->par_in->codec_id) {
261 s->extract = extract_tab[i].extract;
262 break;
263 }
264 }
265 if (!s->extract)
266 return AVERROR_BUG;
267
268 return 0;
269}
270
271static int extract_extradata_filter(AVBSFContext *ctx, AVPacket *out)
272{
273 ExtractExtradataContext *s = ctx->priv_data;
274 AVPacket *in;
275 uint8_t *extradata = NULL;
276 int extradata_size;
277 int ret = 0;
278
279 ret = ff_bsf_get_packet(ctx, &in);
280 if (ret < 0)
281 return ret;
282
283 ret = s->extract(ctx, in, &extradata, &extradata_size);
284 if (ret < 0)
285 goto fail;
286
287 if (extradata) {
288 ret = av_packet_add_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
289 extradata, extradata_size);
290 if (ret < 0) {
291 av_freep(&extradata);
292 goto fail;
293 }
294 }
295
296 av_packet_move_ref(out, in);
297
298fail:
299 av_packet_free(&in);
300 return ret;
301}
302
303static const enum AVCodecID codec_ids[] = {
304 AV_CODEC_ID_CAVS,
305 AV_CODEC_ID_H264,
306 AV_CODEC_ID_HEVC,
307 AV_CODEC_ID_MPEG1VIDEO,
308 AV_CODEC_ID_MPEG2VIDEO,
309 AV_CODEC_ID_MPEG4,
310 AV_CODEC_ID_VC1,
311 AV_CODEC_ID_NONE,
312};
313
314#define OFFSET(x) offsetof(ExtractExtradataContext, x)
315static const AVOption options[] = {
316 { "remove", "remove the extradata from the bitstream", OFFSET(remove), AV_OPT_TYPE_INT,
317 { .i64 = 0 }, 0, 1 },
318 { NULL },
319};
320
321static const AVClass extract_extradata_class = {
322 .class_name = "extract_extradata",
323 .item_name = av_default_item_name,
324 .option = options,
325 .version = LIBAVUTIL_VERSION_INT,
326};
327
328const AVBitStreamFilter ff_extract_extradata_bsf = {
329 .name = "extract_extradata",
330 .codec_ids = codec_ids,
331 .priv_data_size = sizeof(ExtractExtradataContext),
332 .priv_class = &extract_extradata_class,
333 .init = extract_extradata_init,
334 .filter = extract_extradata_filter,
335};
336
generated by cgit at 2024-05-17 04:13:23 (GMT)