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ffmpeg/libavcodec/extract_extradata_bsf.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "av1.h"
#include "av1_parse.h"
#include "bsf.h"
#include "h2645_parse.h"
#include "h264.h"
#include "hevc.h"
#include "vc1_common.h"
typedef struct ExtractExtradataContext {
const AVClass *class;
int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
uint8_t **data, int *size);
/* AV1 specifc fields */
AV1Packet av1_pkt;
/* H264/HEVC specifc fields */
H2645Packet h2645_pkt;
/* AVOptions */
int remove;
} ExtractExtradataContext;
static int val_in_array(const int *arr, int len, int val)
{
int i;
for (i = 0; i < len; i++)
if (arr[i] == val)
return 1;
return 0;
}
static int extract_extradata_av1(AVBSFContext *ctx, AVPacket *pkt,
uint8_t **data, int *size)
{
static const int extradata_obu_types[] = {
AV1_OBU_SEQUENCE_HEADER, AV1_OBU_METADATA,
};
ExtractExtradataContext *s = ctx->priv_data;
int extradata_size = 0, filtered_size = 0;
int nb_extradata_obu_types = FF_ARRAY_ELEMS(extradata_obu_types);
int i, has_seq = 0, ret = 0;
ret = ff_av1_packet_split(&s->av1_pkt, pkt->data, pkt->size, ctx);
if (ret < 0)
return ret;
for (i = 0; i < s->av1_pkt.nb_obus; i++) {
AV1OBU *obu = &s->av1_pkt.obus[i];
if (val_in_array(extradata_obu_types, nb_extradata_obu_types, obu->type)) {
extradata_size += obu->raw_size;
if (obu->type == AV1_OBU_SEQUENCE_HEADER)
has_seq = 1;
} else if (s->remove) {
filtered_size += obu->raw_size;
}
}
if (extradata_size && has_seq) {
AVBufferRef *filtered_buf = NULL;
uint8_t *extradata, *filtered_data;
if (s->remove) {
filtered_buf = av_buffer_alloc(filtered_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!filtered_buf) {
return AVERROR(ENOMEM);
}
memset(filtered_buf->data + filtered_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
filtered_data = filtered_buf->data;
}
extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata) {
av_buffer_unref(&filtered_buf);
return AVERROR(ENOMEM);
}
memset(extradata + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
*data = extradata;
*size = extradata_size;
for (i = 0; i < s->av1_pkt.nb_obus; i++) {
AV1OBU *obu = &s->av1_pkt.obus[i];
if (val_in_array(extradata_obu_types, nb_extradata_obu_types,
obu->type)) {
memcpy(extradata, obu->raw_data, obu->raw_size);
extradata += obu->raw_size;
} else if (s->remove) {
memcpy(filtered_data, obu->raw_data, obu->raw_size);
filtered_data += obu->raw_size;
}
}
if (s->remove) {
av_buffer_unref(&pkt->buf);
pkt->buf = filtered_buf;
pkt->data = filtered_buf->data;
pkt->size = filtered_size;
}
}
return 0;
}
static int extract_extradata_h2645(AVBSFContext *ctx, AVPacket *pkt,
uint8_t **data, int *size)
{
static const int extradata_nal_types_hevc[] = {
HEVC_NAL_VPS, HEVC_NAL_SPS, HEVC_NAL_PPS,
};
static const int extradata_nal_types_h264[] = {
H264_NAL_SPS, H264_NAL_PPS,
};
ExtractExtradataContext *s = ctx->priv_data;
int extradata_size = 0, filtered_size = 0;
const int *extradata_nal_types;
int nb_extradata_nal_types;
int i, has_sps = 0, has_vps = 0, ret = 0;
if (ctx->par_in->codec_id == AV_CODEC_ID_HEVC) {
extradata_nal_types = extradata_nal_types_hevc;
nb_extradata_nal_types = FF_ARRAY_ELEMS(extradata_nal_types_hevc);
} else {
extradata_nal_types = extradata_nal_types_h264;
nb_extradata_nal_types = FF_ARRAY_ELEMS(extradata_nal_types_h264);
}
ret = ff_h2645_packet_split(&s->h2645_pkt, pkt->data, pkt->size,
ctx, 0, 0, ctx->par_in->codec_id, 1, 0);
if (ret < 0)
return ret;
for (i = 0; i < s->h2645_pkt.nb_nals; i++) {
H2645NAL *nal = &s->h2645_pkt.nals[i];
if (val_in_array(extradata_nal_types, nb_extradata_nal_types, nal->type)) {
extradata_size += nal->raw_size + 3;
if (ctx->par_in->codec_id == AV_CODEC_ID_HEVC) {
if (nal->type == HEVC_NAL_SPS) has_sps = 1;
if (nal->type == HEVC_NAL_VPS) has_vps = 1;
} else {
if (nal->type == H264_NAL_SPS) has_sps = 1;
}
} else if (s->remove) {
filtered_size += nal->raw_size + 3;
}
}
if (extradata_size &&
((ctx->par_in->codec_id == AV_CODEC_ID_HEVC && has_sps && has_vps) ||
(ctx->par_in->codec_id == AV_CODEC_ID_H264 && has_sps))) {
AVBufferRef *filtered_buf = NULL;
uint8_t *extradata, *filtered_data;
if (s->remove) {
filtered_buf = av_buffer_alloc(filtered_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!filtered_buf) {
return AVERROR(ENOMEM);
}
memset(filtered_buf->data + filtered_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
filtered_data = filtered_buf->data;
}
extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata) {
av_buffer_unref(&filtered_buf);
return AVERROR(ENOMEM);
}
memset(extradata + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
*data = extradata;
*size = extradata_size;
for (i = 0; i < s->h2645_pkt.nb_nals; i++) {
H2645NAL *nal = &s->h2645_pkt.nals[i];
if (val_in_array(extradata_nal_types, nb_extradata_nal_types,
nal->type)) {
AV_WB24(extradata, 1); // startcode
memcpy(extradata + 3, nal->raw_data, nal->raw_size);
extradata += 3 + nal->raw_size;
} else if (s->remove) {
AV_WB24(filtered_data, 1); // startcode
memcpy(filtered_data + 3, nal->raw_data, nal->raw_size);
filtered_data += 3 + nal->raw_size;
}
}
if (s->remove) {
av_buffer_unref(&pkt->buf);
pkt->buf = filtered_buf;
pkt->data = filtered_buf->data;
pkt->size = filtered_size;
}
}
return 0;
}
static int extract_extradata_vc1(AVBSFContext *ctx, AVPacket *pkt,
uint8_t **data, int *size)
{
ExtractExtradataContext *s = ctx->priv_data;
const uint8_t *ptr = pkt->data, *end = pkt->data + pkt->size;
uint32_t state = UINT32_MAX;
int has_extradata = 0, extradata_size = 0;
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &state);
if (state == VC1_CODE_SEQHDR || state == VC1_CODE_ENTRYPOINT) {
has_extradata = 1;
} else if (has_extradata && IS_MARKER(state)) {
extradata_size = ptr - 4 - pkt->data;
break;
}
}
if (extradata_size) {
*data = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!*data)
return AVERROR(ENOMEM);
memcpy(*data, pkt->data, extradata_size);
memset(*data + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
*size = extradata_size;
if (s->remove) {
pkt->data += extradata_size;
pkt->size -= extradata_size;
}
}
return 0;
}
static int extract_extradata_mpeg12(AVBSFContext *ctx, AVPacket *pkt,
uint8_t **data, int *size)
{
ExtractExtradataContext *s = ctx->priv_data;
uint32_t state = UINT32_MAX;
int i, found = 0;
for (i = 0; i < pkt->size; i++) {
state = (state << 8) | pkt->data[i];
if (state == 0x1B3)
found = 1;
else if (found && state != 0x1B5 && state < 0x200 && state >= 0x100) {
if (i > 3) {
*size = i - 3;
*data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!*data)
return AVERROR(ENOMEM);
memcpy(*data, pkt->data, *size);
memset(*data + *size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
if (s->remove) {
pkt->data += *size;
pkt->size -= *size;
}
}
break;
}
}
return 0;
}
static int extract_extradata_mpeg4(AVBSFContext *ctx, AVPacket *pkt,
uint8_t **data, int *size)
{
ExtractExtradataContext *s = ctx->priv_data;
const uint8_t *ptr = pkt->data, *end = pkt->data + pkt->size;
uint32_t state = UINT32_MAX;
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &state);
if (state == 0x1B3 || state == 0x1B6) {
if (ptr - pkt->data > 4) {
*size = ptr - 4 - pkt->data;
*data = av_malloc(*size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!*data)
return AVERROR(ENOMEM);
memcpy(*data, pkt->data, *size);
memset(*data + *size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
if (s->remove) {
pkt->data += *size;
pkt->size -= *size;
}
}
break;
}
}
return 0;
}
static const struct {
enum AVCodecID id;
int (*extract)(AVBSFContext *ctx, AVPacket *pkt,
uint8_t **data, int *size);
} extract_tab[] = {
{ AV_CODEC_ID_AV1, extract_extradata_av1 },
{ AV_CODEC_ID_AVS2, extract_extradata_mpeg4 },
{ AV_CODEC_ID_CAVS, extract_extradata_mpeg4 },
{ AV_CODEC_ID_H264, extract_extradata_h2645 },
{ AV_CODEC_ID_HEVC, extract_extradata_h2645 },
{ AV_CODEC_ID_MPEG1VIDEO, extract_extradata_mpeg12 },
{ AV_CODEC_ID_MPEG2VIDEO, extract_extradata_mpeg12 },
{ AV_CODEC_ID_MPEG4, extract_extradata_mpeg4 },
{ AV_CODEC_ID_VC1, extract_extradata_vc1 },
};
static int extract_extradata_init(AVBSFContext *ctx)
{
ExtractExtradataContext *s = ctx->priv_data;
int i;
for (i = 0; i < FF_ARRAY_ELEMS(extract_tab); i++) {
if (extract_tab[i].id == ctx->par_in->codec_id) {
s->extract = extract_tab[i].extract;
break;
}
}
if (!s->extract)
return AVERROR_BUG;
return 0;
}
static int extract_extradata_filter(AVBSFContext *ctx, AVPacket *pkt)
{
ExtractExtradataContext *s = ctx->priv_data;
uint8_t *extradata = NULL;
int extradata_size;
int ret = 0;
ret = ff_bsf_get_packet_ref(ctx, pkt);
if (ret < 0)
return ret;
ret = s->extract(ctx, pkt, &extradata, &extradata_size);
if (ret < 0)
goto fail;
if (extradata) {
ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
extradata, extradata_size);
if (ret < 0) {
av_freep(&extradata);
goto fail;
}
}
return 0;
fail:
av_packet_unref(pkt);
return ret;
}
static void extract_extradata_close(AVBSFContext *ctx)
{
ExtractExtradataContext *s = ctx->priv_data;
ff_av1_packet_uninit(&s->av1_pkt);
ff_h2645_packet_uninit(&s->h2645_pkt);
}
static const enum AVCodecID codec_ids[] = {
AV_CODEC_ID_AV1,
AV_CODEC_ID_AVS2,
AV_CODEC_ID_CAVS,
AV_CODEC_ID_H264,
AV_CODEC_ID_HEVC,
AV_CODEC_ID_MPEG1VIDEO,
AV_CODEC_ID_MPEG2VIDEO,
AV_CODEC_ID_MPEG4,
AV_CODEC_ID_VC1,
AV_CODEC_ID_NONE,
};
#define OFFSET(x) offsetof(ExtractExtradataContext, x)
#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
static const AVOption options[] = {
{ "remove", "remove the extradata from the bitstream", OFFSET(remove), AV_OPT_TYPE_INT,
{ .i64 = 0 }, 0, 1, FLAGS },
{ NULL },
};
static const AVClass extract_extradata_class = {
.class_name = "extract_extradata",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVBitStreamFilter ff_extract_extradata_bsf = {
.name = "extract_extradata",
.codec_ids = codec_ids,
.priv_data_size = sizeof(ExtractExtradataContext),
.priv_class = &extract_extradata_class,
.init = extract_extradata_init,
.filter = extract_extradata_filter,
.close = extract_extradata_close,
};
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