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 <string.h>
#include "avcodec.h"
#include "bsf.h"
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
enum DumpFreq {
DUMP_FREQ_KEYFRAME,
DUMP_FREQ_ALL,
};
typedef struct DumpExtradataContext {
const AVClass *class;
AVPacket pkt;
int freq;
} DumpExtradataContext;
static int dump_extradata(AVBSFContext *ctx, AVPacket *out)
{
DumpExtradataContext *s = ctx->priv_data;
AVPacket *in = &s->pkt;
int ret = 0;
ret = ff_bsf_get_packet_ref(ctx, in);
if (ret < 0)
return ret;
if (ctx->par_in->extradata &&
(s->freq == DUMP_FREQ_ALL ||
(s->freq == DUMP_FREQ_KEYFRAME && in->flags & AV_PKT_FLAG_KEY)) &&
in->size >= ctx->par_in->extradata_size &&
memcmp(in->data, ctx->par_in->extradata, ctx->par_in->extradata_size)) {
if (in->size >= INT_MAX - ctx->par_in->extradata_size) {
ret = AVERROR(ERANGE);
goto fail;
}
ret = av_new_packet(out, in->size + ctx->par_in->extradata_size);
if (ret < 0)
goto fail;
ret = av_packet_copy_props(out, in);
if (ret < 0) {
av_packet_unref(out);
goto fail;
}
memcpy(out->data, ctx->par_in->extradata, ctx->par_in->extradata_size);
memcpy(out->data + ctx->par_in->extradata_size, in->data, in->size);
} else {
av_packet_move_ref(out, in);
}
fail:
av_packet_unref(in);
return ret;
}
#define OFFSET(x) offsetof(DumpExtradataContext, x)
#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
static const AVOption options[] = {
{ "freq", "When to dump extradata", OFFSET(freq), AV_OPT_TYPE_INT,
{ .i64 = DUMP_FREQ_KEYFRAME }, DUMP_FREQ_KEYFRAME, DUMP_FREQ_ALL, FLAGS, "freq" },
{ "k", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
{ "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
{ "e", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
{ "all", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL }, .flags = FLAGS, .unit = "freq" },
{ NULL },
};
static const AVClass dump_extradata_class = {
.class_name = "dump_extradata bsf",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVBitStreamFilter ff_dump_extradata_bsf = {
.name = "dump_extra",
.priv_data_size = sizeof(DumpExtradataContext),
.priv_class = &dump_extradata_class,
.filter = dump_extradata,
};
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