libavcodec/dump_extradata_bsf.c

   1 /*
   2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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 "avcodec.h"
  24 #include "bsf.h"
  25
  26 #include "libavutil/log.h"
  27 #include "libavutil/mem.h"
  28 #include "libavutil/opt.h"
  29
  30 enum DumpFreq {
  31     DUMP_FREQ_KEYFRAME,
  32     DUMP_FREQ_ALL,
  33 };
  34
  35 typedef struct DumpExtradataContext {
  36     const AVClass *class;
  37     int freq;
  38 } DumpExtradataContext;
  39
  40 static int dump_extradata(AVBSFContext *ctx, AVPacket *out)
  41 {
  42     DumpExtradataContext *s = ctx->priv_data;
  43     AVPacket *in;
  44     int ret = 0;
  45
  46     ret = ff_bsf_get_packet(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         if (in->size >= INT_MAX - ctx->par_in->extradata_size) {
  54             ret = AVERROR(ERANGE);
  55             goto fail;
  56         }
  57
  58         ret = av_new_packet(out, in->size + ctx->par_in->extradata_size);
  59         if (ret < 0)
  60             goto fail;
  61
  62         ret = av_packet_copy_props(out, in);
  63         if (ret < 0) {
  64             av_packet_unref(out);
  65             goto fail;
  66         }
  67
  68         memcpy(out->data, ctx->par_in->extradata, ctx->par_in->extradata_size);
  69         memcpy(out->data + ctx->par_in->extradata_size, in->data, in->size);
  70     } else {
  71         av_packet_move_ref(out, in);
  72     }
  73
  74 fail:
  75     av_packet_free(&in);
  76
  77     return ret;
  78 }
  79
  80 #define OFFSET(x) offsetof(DumpExtradataContext, x)
  81 static const AVOption options[] = {
  82     { "freq", "When do dump extradata", OFFSET(freq), AV_OPT_TYPE_INT,
  83         { .i64 = DUMP_FREQ_KEYFRAME }, DUMP_FREQ_KEYFRAME, DUMP_FREQ_ALL, 0, "freq" },
  84         { "keyframe", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_KEYFRAME }, .unit = "freq" },
  85         { "all",      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = DUMP_FREQ_ALL      }, .unit = "freq" },
  86     { NULL },
  87 };
  88
  89 static const AVClass dump_extradata_class = {
  90     .class_name = "dump_extradata bsf",
  91     .item_name  = av_default_item_name,
  92     .option     = options,
  93     .version    = LIBAVUTIL_VERSION_MAJOR,
  94 };
  95
  96 const AVBitStreamFilter ff_dump_extradata_bsf = {
  97     .name           = "dump_extra",
  98     .priv_data_size = sizeof(DumpExtradataContext),
  99     .priv_class     = &dump_extradata_class,
 100     .filter         = dump_extradata,
 101 };