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, filtered_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;
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;
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;
91 if (nal->type == H264_NAL_SPS) has_sps = 1;
93 } else if (s->remove) {
94 filtered_size += nal->raw_size + 3;
99 ((ctx->par_in->codec_id == AV_CODEC_ID_HEVC && has_sps && has_vps) ||
100 (ctx->par_in->codec_id == AV_CODEC_ID_H264 && has_sps))) {
101 AVBufferRef *filtered_buf;
102 uint8_t *extradata, *filtered_data;
105 filtered_buf = av_buffer_alloc(filtered_size + AV_INPUT_BUFFER_PADDING_SIZE);
107 ret = AVERROR(ENOMEM);
110 memset(filtered_buf->data + filtered_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
112 filtered_data = filtered_buf->data;
115 extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
117 av_buffer_unref(&filtered_buf);
118 ret = AVERROR(ENOMEM);
121 memset(extradata + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
124 *size = extradata_size;
126 for (i = 0; i < h2645_pkt.nb_nals; i++) {
127 H2645NAL *nal = &h2645_pkt.nals[i];
128 if (val_in_array(extradata_nal_types, nb_extradata_nal_types,
130 AV_WB24(extradata, 1); // startcode
131 memcpy(extradata + 3, nal->raw_data, nal->raw_size);
132 extradata += 3 + nal->raw_size;
133 } else if (s->remove) {
134 AV_WB24(filtered_data, 1); // startcode
135 memcpy(filtered_data + 3, nal->raw_data, nal->raw_size);
136 filtered_data += 3 + nal->raw_size;
141 av_buffer_unref(&pkt->buf);
142 pkt->buf = filtered_buf;
143 pkt->data = filtered_buf->data;
144 pkt->size = filtered_size;
149 ff_h2645_packet_uninit(&h2645_pkt);
153 static int extract_extradata_vc1(AVBSFContext *ctx, AVPacket *pkt,
154 uint8_t **data, int *size)
156 ExtractExtradataContext *s = ctx->priv_data;
157 uint32_t state = UINT32_MAX;
158 int has_extradata = 0, extradata_size = 0;
161 for (i = 0; i < pkt->size; i++) {
162 state = (state << 8) | pkt->data[i];
163 if (IS_MARKER(state)) {
164 if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
166 } else if (has_extradata) {
167 extradata_size = i - 3;
173 if (extradata_size) {
174 *data = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
176 return AVERROR(ENOMEM);
178 memcpy(*data, pkt->data, extradata_size);
179 memset(*data + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
180 *size = extradata_size;
183 pkt->data += extradata_size;
184 pkt->size -= extradata_size;
191 static int extract_extradata_mpeg124(AVBSFContext *ctx, AVPacket *pkt,
192 uint8_t **data, int *size)
194 ExtractExtradataContext *s = ctx->priv_data;
195 int is_mpeg12 = ctx->par_in->codec_id == AV_CODEC_ID_MPEG1VIDEO ||
196 ctx->par_in->codec_id == AV_CODEC_ID_MPEG2VIDEO;
197 uint32_t state = UINT32_MAX;
200 for (i = 0; i < pkt->size; i++) {
201 state = (state << 8) | pkt->data[i];
202 if ((is_mpeg12 && state != 0x1B3 && state != 0x1B5 && state < 0x200 && state >= 0x100) ||
203 (!is_mpeg12 && (state == 0x1B3 || state == 0x1B6))) {
206 *data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
208 return AVERROR(ENOMEM);
210 memcpy(*data, pkt->data, *size);
211 memset(*data + *size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
224 static const struct {
226 int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
227 uint8_t **data, int *size);
229 { AV_CODEC_ID_CAVS, extract_extradata_mpeg124 },
230 { AV_CODEC_ID_H264, extract_extradata_h2645 },
231 { AV_CODEC_ID_HEVC, extract_extradata_h2645 },
232 { AV_CODEC_ID_MPEG1VIDEO, extract_extradata_mpeg124 },
233 { AV_CODEC_ID_MPEG2VIDEO, extract_extradata_mpeg124 },
234 { AV_CODEC_ID_MPEG4, extract_extradata_mpeg124 },
235 { AV_CODEC_ID_VC1, extract_extradata_vc1 },
238 static int extract_extradata_init(AVBSFContext *ctx)
240 ExtractExtradataContext *s = ctx->priv_data;
243 for (i = 0; i < FF_ARRAY_ELEMS(extract_tab); i++) {
244 if (extract_tab[i].id == ctx->par_in->codec_id) {
245 s->extract = extract_tab[i].extract;
255 static int extract_extradata_filter(AVBSFContext *ctx, AVPacket *pkt)
257 ExtractExtradataContext *s = ctx->priv_data;
258 uint8_t *extradata = NULL;
262 ret = ff_bsf_get_packet_ref(ctx, pkt);
266 ret = s->extract(ctx, pkt, &extradata, &extradata_size);
271 ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
272 extradata, extradata_size);
274 av_freep(&extradata);
282 av_packet_unref(pkt);
286 static const enum AVCodecID codec_ids[] = {
290 AV_CODEC_ID_MPEG1VIDEO,
291 AV_CODEC_ID_MPEG2VIDEO,
297 #define OFFSET(x) offsetof(ExtractExtradataContext, x)
298 static const AVOption options[] = {
299 { "remove", "remove the extradata from the bitstream", OFFSET(remove), AV_OPT_TYPE_INT,
300 { .i64 = 0 }, 0, 1 },
304 static const AVClass extract_extradata_class = {
305 .class_name = "extract_extradata",
306 .item_name = av_default_item_name,
308 .version = LIBAVUTIL_VERSION_INT,
311 const AVBitStreamFilter ff_extract_extradata_bsf = {
312 .name = "extract_extradata",
313 .codec_ids = codec_ids,
314 .priv_data_size = sizeof(ExtractExtradataContext),
315 .priv_class = &extract_extradata_class,
316 .init = extract_extradata_init,
317 .filter = extract_extradata_filter,