aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* 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 "libavutil/log.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bsf.h"
enum RemoveFreq {
REMOVE_FREQ_KEYFRAME,
REMOVE_FREQ_ALL,
REMOVE_FREQ_NONKEYFRAME,
};
typedef struct RemoveExtradataContext {
const AVClass *class;
int freq;
AVCodecParserContext *parser;
AVCodecContext *avctx;
} RemoveExtradataContext;
static int remove_extradata(AVBSFContext *ctx, AVPacket *pkt)
{
RemoveExtradataContext *s = ctx->priv_data;
int ret;
ret = ff_bsf_get_packet_ref(ctx, pkt);
if (ret < 0)
return ret;
if (s->parser && s->parser->parser->split) {
if (s->freq == REMOVE_FREQ_ALL ||
(s->freq == REMOVE_FREQ_NONKEYFRAME && !(pkt->flags & AV_PKT_FLAG_KEY)) ||
(s->freq == REMOVE_FREQ_KEYFRAME && pkt->flags & AV_PKT_FLAG_KEY)) {
int i = s->parser->parser->split(s->avctx, pkt->data, pkt->size);
pkt->data += i;
pkt->size -= i;
}
}
return 0;
}
static int remove_extradata_init(AVBSFContext *ctx)
{
RemoveExtradataContext *s = ctx->priv_data;
int ret;
s->parser = av_parser_init(ctx->par_in->codec_id);
if (s->parser) {
s->avctx = avcodec_alloc_context3(NULL);
if (!s->avctx)
return AVERROR(ENOMEM);
ret = avcodec_parameters_to_context(s->avctx, ctx->par_in);
if (ret < 0)
return ret;
}
return 0;
}
static void remove_extradata_close(AVBSFContext *ctx)
{
RemoveExtradataContext *s = ctx->priv_data;
avcodec_free_context(&s->avctx);
av_parser_close(s->parser);
}
#define OFFSET(x) offsetof(RemoveExtradataContext, x)
#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
static const AVOption options[] = {
{ "freq", NULL, OFFSET(freq), AV_OPT_TYPE_INT, { .i64 = REMOVE_FREQ_KEYFRAME }, REMOVE_FREQ_KEYFRAME, REMOVE_FREQ_NONKEYFRAME, FLAGS, "freq" },
{ "k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_NONKEYFRAME }, .flags = FLAGS, .unit = "freq" },
{ "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
{ "e", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
{ "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
{ NULL },
};
static const AVClass remove_extradata_class = {
.class_name = "remove_extradata",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVBitStreamFilter ff_remove_extradata_bsf = {
.name = "remove_extra",
.priv_data_size = sizeof(RemoveExtradataContext),
.priv_class = &remove_extradata_class,
.init = remove_extradata_init,
.close = remove_extradata_close,
.filter = remove_extradata,
};
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