2 * This file is part of Libav.
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.
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.
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
21 #include "libavutil/common.h"
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/log.h"
24 #include "libavutil/opt.h"
28 #include "h2645_parse.h"
31 #include "vc1_common.h"
33 typedef struct ExtractExtradataContext {
36 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
37 uint8_t **data, int *size);
41 } ExtractExtradataContext;
43 static int val_in_array(const int *arr, int len, int val)
46 for (i = 0; i < len; i++)
52 static int extract_extradata_h2645(AVBSFContext *ctx, AVPacket *pkt,
53 uint8_t **data, int *size)
55 static const int extradata_nal_types_hevc[] = {
56 HEVC_NAL_VPS, HEVC_NAL_SPS, HEVC_NAL_PPS,
58 static const int extradata_nal_types_h264[] = {
59 H264_NAL_SPS, H264_NAL_PPS,
62 ExtractExtradataContext *s = ctx->priv_data;
64 H2645Packet h2645_pkt = { 0 };
65 int extradata_size = 0;
66 const int *extradata_nal_types;
67 int nb_extradata_nal_types;
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);
74 extradata_nal_types = extradata_nal_types_h264;
75 nb_extradata_nal_types = FF_ARRAY_ELEMS(extradata_nal_types_h264);
78 ret = ff_h2645_packet_split(&h2645_pkt, pkt->data, pkt->size,
79 ctx, 0, 0, ctx->par_in->codec_id);
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;
90 AVBufferRef *filtered_buf;
91 uint8_t *extradata, *filtered_data;
94 filtered_buf = av_buffer_alloc(pkt->size + AV_INPUT_BUFFER_PADDING_SIZE);
97 filtered_data = filtered_buf->data;
100 extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
102 av_buffer_unref(&filtered_buf);
107 *size = extradata_size;
109 for (i = 0; i < h2645_pkt.nb_nals; i++) {
110 H2645NAL *nal = &h2645_pkt.nals[i];
111 if (val_in_array(extradata_nal_types, nb_extradata_nal_types,
113 AV_WB24(extradata, 1); // startcode
114 memcpy(extradata + 3, nal->raw_data, nal->raw_size);
115 extradata += 3 + nal->raw_size;
116 } else if (s->remove) {
117 AV_WB24(filtered_data, 1); // startcode
118 memcpy(filtered_data + 3, nal->raw_data, nal->raw_size);
119 filtered_data += 3 + nal->raw_size;
124 av_buffer_unref(&pkt->buf);
125 pkt->buf = filtered_buf;
126 pkt->data = filtered_buf->data;
127 pkt->size = filtered_data - filtered_buf->data;
132 ff_h2645_packet_uninit(&h2645_pkt);
136 static int extract_extradata_vc1(AVBSFContext *ctx, AVPacket *pkt,
137 uint8_t **data, int *size)
139 ExtractExtradataContext *s = ctx->priv_data;
140 uint32_t state = UINT32_MAX;
141 int has_extradata = 0, extradata_size = 0;
144 for (i = 0; i < pkt->size; i++) {
145 state = (state << 8) | pkt->data[i];
146 if (IS_MARKER(state)) {
147 if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
149 } else if (has_extradata) {
150 extradata_size = i - 3;
156 if (extradata_size) {
157 *data = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
159 return AVERROR(ENOMEM);
161 memcpy(*data, pkt->data, extradata_size);
162 *size = extradata_size;
165 pkt->data += extradata_size;
166 pkt->size -= extradata_size;
173 static int extract_extradata_mpeg124(AVBSFContext *ctx, AVPacket *pkt,
174 uint8_t **data, int *size)
176 ExtractExtradataContext *s = ctx->priv_data;
177 int is_mpeg12 = ctx->par_in->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
178 ctx->par_in->codec_id == AV_CODEC_ID_MPEG2VIDEO;
179 uint32_t state = UINT32_MAX;
182 for (i = 0; i < pkt->size; i++) {
183 state = (state << 8) | pkt->data[i];
184 if ((is_mpeg12 && state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100) ||
185 (!is_mpeg12 && (state == 0x1B3 || state == 0x1B6))) {
188 *data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
190 return AVERROR(ENOMEM);
192 memcpy(*data, pkt->data, *size);
205 static const struct {
207 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
208 uint8_t **data, int *size);
210 { AV_CODEC_ID_CAVS, extract_extradata_mpeg124 },
211 { AV_CODEC_ID_H264, extract_extradata_h2645 },
212 { AV_CODEC_ID_HEVC, extract_extradata_h2645 },
213 { AV_CODEC_ID_MPEG1VIDEO, extract_extradata_mpeg124 },
214 { AV_CODEC_ID_MPEG2VIDEO, extract_extradata_mpeg124 },
215 { AV_CODEC_ID_MPEG4, extract_extradata_mpeg124 },
216 { AV_CODEC_ID_VC1, extract_extradata_vc1 },
219 static int extract_extradata_init(AVBSFContext *ctx)
221 ExtractExtradataContext *s = ctx->priv_data;
224 for (i = 0; i < FF_ARRAY_ELEMS(extract_tab); i++) {
225 if (extract_tab[i].id == ctx->par_in->codec_id) {
226 s->extract = extract_tab[i].extract;
236 static int extract_extradata_filter(AVBSFContext *ctx, AVPacket *out)
238 ExtractExtradataContext *s = ctx->priv_data;
240 uint8_t *extradata = NULL;
244 ret = ff_bsf_get_packet(ctx, &in);
248 ret = s->extract(ctx, in, &extradata, &extradata_size);
253 ret = av_packet_add_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
254 extradata, extradata_size);
256 av_freep(&extradata);
261 av_packet_move_ref(out, in);
268 static const enum AVCodecID codec_ids[] = {
272 AV_CODEC_ID_MPEG1VIDEO,
273 AV_CODEC_ID_MPEG2VIDEO,
279 #define OFFSET(x) offsetof(ExtractExtradataContext, x)
280 static const AVOption options[] = {
281 { "remove", "remove the extradata from the bitstream", OFFSET(remove), AV_OPT_TYPE_INT,
282 { .i64 = 0 }, 0, 1 },
286 static const AVClass extract_extradata_class = {
287 .class_name = "extract_extradata",
288 .item_name = av_default_item_name,
290 .version = LIBAVUTIL_VERSION_INT,
293 const AVBitStreamFilter ff_extract_extradata_bsf = {
294 .name = "extract_extradata",
295 .codec_ids = codec_ids,
296 .priv_data_size = sizeof(ExtractExtradataContext),
297 .priv_class = &extract_extradata_class,
298 .init = extract_extradata_init,
299 .filter = extract_extradata_filter,