1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include <string.h>
22
23#include "bsf.h"
24#include "bsf_internal.h"
25
26#include "libavutil/log.h"
27#include "libavutil/opt.h"
28
29enum DumpFreq {
30    DUMP_FREQ_KEYFRAME,
31    DUMP_FREQ_ALL,
32};
33
34typedef struct DumpExtradataContext {
35    const AVClass *class;
36    AVPacket pkt;
37    int freq;
38} DumpExtradataContext;
39
40static int dump_extradata(AVBSFContext *ctx, AVPacket *out)
41{
42    DumpExtradataContext *s = ctx->priv_data;
43    AVPacket *in = &s->pkt;
44    int ret = 0;
45
46    ret = ff_bsf_get_packet_ref(ctx, in);
47    if (ret < 0)
48        return ret;
49
50    if (ctx->par_in->extradata &&
51        (s->freq == DUMP_FREQ_ALL ||
52         (s->freq == DUMP_FREQ_KEYFRAME && in->flags & AV_PKT_FLAG_KEY)) &&
53         (in->size < ctx->par_in->extradata_size ||
54          memcmp(in->data, ctx->par_in->extradata, ctx->par_in->extradata_size))) {
55        if (in->size >= INT_MAX - ctx->par_in->extradata_size) {
56            ret = AVERROR(ERANGE);
57            goto fail;
58        }
59
60        ret = av_new_packet(out, in->size + ctx->par_in->extradata_size);
61        if (ret < 0)
62            goto fail;
63
64        ret = av_packet_copy_props(out, in);
65        if (ret < 0) {
66            av_packet_unref(out);
67            goto fail;
68        }
69
70        memcpy(out->data, ctx->par_in->extradata, ctx->par_in->extradata_size);
71        memcpy(out->data + ctx->par_in->extradata_size, in->data, in->size);
72    } else {
73        av_packet_move_ref(out, in);
74    }
75
76fail:
77    av_packet_unref(in);
78
79    return ret;
80}
81
82#define OFFSET(x) offsetof(DumpExtradataContext, x)
83#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
84static const AVOption options[] = {
85    { "freq", "When to dump extradata", OFFSET(freq), AV_OPT_TYPE_INT,
86        { .i64 = DUMP_FREQ_KEYFRAME }, DUMP_FREQ_KEYFRAME, DUMP_FREQ_ALL, FLAGS, "freq" },
87        { "k",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
88        { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .flags = FLAGS, .unit = "freq" },
89        { "e",        NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL      }, .flags = FLAGS, .unit = "freq" },
90        { "all",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL      }, .flags = FLAGS, .unit = "freq" },
91    { NULL },
92};
93
94static const AVClass dump_extradata_class = {
95    .class_name = "dump_extradata bsf",
96    .item_name  = av_default_item_name,
97    .option     = options,
98    .version    = LIBAVUTIL_VERSION_INT,
99};
100
101const FFBitStreamFilter ff_dump_extradata_bsf = {
102    .p.name         = "dump_extra",
103    .p.priv_class   = &dump_extradata_class,
104    .priv_data_size = sizeof(DumpExtradataContext),
105    .filter         = dump_extradata,
106};
107