cpu: split flag checks per arch in av_cpu_max_align()
[libav.git] / libavcodec / extract_extradata_bsf.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav 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 * Libav 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 Libav; 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
33 typedef 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
43 static 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
52 static 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);
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
140 fail:
141 ff_h2645_packet_uninit(&h2645_pkt);
142 return ret;
143 }
144
145 static int extract_extradata_vc1(AVBSFContext *ctx, AVPacket *pkt,
146 uint8_t **data, int *size)
147 {
148 ExtractExtradataContext *s = ctx->priv_data;
149 uint32_t state = UINT32_MAX;
150 int has_extradata = 0, extradata_size = 0;
151 int i;
152
153 for (i = 0; i < pkt->size; i++) {
154 state = (state << 8) | pkt->data[i];
155 if (IS_MARKER(state)) {
156 if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
157 has_extradata = 1;
158 } else if (has_extradata) {
159 extradata_size = i - 3;
160 break;
161 }
162 }
163 }
164
165 if (extradata_size) {
166 *data = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
167 if (!*data)
168 return AVERROR(ENOMEM);
169
170 memcpy(*data, pkt->data, extradata_size);
171 *size = extradata_size;
172
173 if (s->remove) {
174 pkt->data += extradata_size;
175 pkt->size -= extradata_size;
176 }
177 }
178
179 return 0;
180 }
181
182 static int extract_extradata_mpeg124(AVBSFContext *ctx, AVPacket *pkt,
183 uint8_t **data, int *size)
184 {
185 ExtractExtradataContext *s = ctx->priv_data;
186 int is_mpeg12 = ctx->par_in->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
187 ctx->par_in->codec_id == AV_CODEC_ID_MPEG2VIDEO;
188 uint32_t state = UINT32_MAX;
189 int i;
190
191 for (i = 0; i < pkt->size; i++) {
192 state = (state << 8) | pkt->data[i];
193 if ((is_mpeg12 && state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100) ||
194 (!is_mpeg12 && (state == 0x1B3 || state == 0x1B6))) {
195 if (i > 3) {
196 *size = i - 3;
197 *data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
198 if (!*data)
199 return AVERROR(ENOMEM);
200
201 memcpy(*data, pkt->data, *size);
202
203 if (s->remove) {
204 pkt->data += *size;
205 pkt->size -= *size;
206 }
207 }
208 break;
209 }
210 }
211 return 0;
212 }
213
214 static const struct {
215 enum AVCodecID id;
216 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
217 uint8_t **data, int *size);
218 } extract_tab[] = {
219 { AV_CODEC_ID_CAVS, extract_extradata_mpeg124 },
220 { AV_CODEC_ID_H264, extract_extradata_h2645 },
221 { AV_CODEC_ID_HEVC, extract_extradata_h2645 },
222 { AV_CODEC_ID_MPEG1VIDEO, extract_extradata_mpeg124 },
223 { AV_CODEC_ID_MPEG2VIDEO, extract_extradata_mpeg124 },
224 { AV_CODEC_ID_MPEG4, extract_extradata_mpeg124 },
225 { AV_CODEC_ID_VC1, extract_extradata_vc1 },
226 };
227
228 static int extract_extradata_init(AVBSFContext *ctx)
229 {
230 ExtractExtradataContext *s = ctx->priv_data;
231 int i;
232
233 for (i = 0; i < FF_ARRAY_ELEMS(extract_tab); i++) {
234 if (extract_tab[i].id == ctx->par_in->codec_id) {
235 s->extract = extract_tab[i].extract;
236 break;
237 }
238 }
239 if (!s->extract)
240 return AVERROR_BUG;
241
242 return 0;
243 }
244
245 static int extract_extradata_filter(AVBSFContext *ctx, AVPacket *out)
246 {
247 ExtractExtradataContext *s = ctx->priv_data;
248 AVPacket *in;
249 uint8_t *extradata = NULL;
250 int extradata_size;
251 int ret = 0;
252
253 ret = ff_bsf_get_packet(ctx, &in);
254 if (ret < 0)
255 return ret;
256
257 ret = s->extract(ctx, in, &extradata, &extradata_size);
258 if (ret < 0)
259 goto fail;
260
261 if (extradata) {
262 ret = av_packet_add_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
263 extradata, extradata_size);
264 if (ret < 0) {
265 av_freep(&extradata);
266 goto fail;
267 }
268 }
269
270 av_packet_move_ref(out, in);
271
272 fail:
273 av_packet_free(&in);
274 return ret;
275 }
276
277 static const enum AVCodecID codec_ids[] = {
278 AV_CODEC_ID_CAVS,
279 AV_CODEC_ID_H264,
280 AV_CODEC_ID_HEVC,
281 AV_CODEC_ID_MPEG1VIDEO,
282 AV_CODEC_ID_MPEG2VIDEO,
283 AV_CODEC_ID_MPEG4,
284 AV_CODEC_ID_VC1,
285 AV_CODEC_ID_NONE,
286 };
287
288 #define OFFSET(x) offsetof(ExtractExtradataContext, x)
289 static const AVOption options[] = {
290 { "remove", "remove the extradata from the bitstream", OFFSET(remove), AV_OPT_TYPE_INT,
291 { .i64 = 0 }, 0, 1 },
292 { NULL },
293 };
294
295 static const AVClass extract_extradata_class = {
296 .class_name = "extract_extradata",
297 .item_name = av_default_item_name,
298 .option = options,
299 .version = LIBAVUTIL_VERSION_INT,
300 };
301
302 const AVBitStreamFilter ff_extract_extradata_bsf = {
303 .name = "extract_extradata",
304 .codec_ids = codec_ids,
305 .priv_data_size = sizeof(ExtractExtradataContext),
306 .priv_class = &extract_extradata_class,
307 .init = extract_extradata_init,
308 .filter = extract_extradata_filter,
309 };