libavcodec/bitstream_filter.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
  25 #include "libavutil/internal.h"
  26 #include "libavutil/mem.h"
  27
  28 #if FF_API_OLD_BSF
  29 FF_DISABLE_DEPRECATION_WARNINGS
  30
  31 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f)
  32 {
  33     const AVBitStreamFilter *filter = NULL;
  34     void *opaque = NULL;
  35
  36     while (filter != f)
  37         filter = av_bsf_next(&opaque);
  38
  39     return av_bsf_next(&opaque);
  40 }
  41
  42 void av_register_bitstream_filter(AVBitStreamFilter *bsf)
  43 {
  44 }
  45
  46 typedef struct BSFCompatContext {
  47     AVBSFContext *ctx;
  48 } BSFCompatContext;
  49
  50 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name)
  51 {
  52     AVBitStreamFilterContext *ctx = NULL;
  53     BSFCompatContext         *priv = NULL;
  54     const AVBitStreamFilter *bsf;
  55
  56     bsf = av_bsf_get_by_name(name);
  57     if (!bsf)
  58         return NULL;
  59
  60     ctx = av_mallocz(sizeof(*ctx));
  61     if (!ctx)
  62         return NULL;
  63
  64     priv = av_mallocz(sizeof(*priv));
  65     if (!priv)
  66         goto fail;
  67
  68
  69     ctx->filter    = bsf;
  70     ctx->priv_data = priv;
  71
  72     return ctx;
  73
  74 fail:
  75     if (priv)
  76         av_bsf_free(&priv->ctx);
  77     av_freep(&priv);
  78     av_freep(&ctx);
  79     return NULL;
  80 }
  81
  82 void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc)
  83 {
  84     BSFCompatContext *priv = bsfc->priv_data;
  85
  86     av_bsf_free(&priv->ctx);
  87     av_freep(&bsfc->priv_data);
  88     av_free(bsfc);
  89 }
  90
  91 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
  92                                AVCodecContext *avctx, const char *args,
  93                                uint8_t **poutbuf, int *poutbuf_size,
  94                                const uint8_t *buf, int buf_size, int keyframe)
  95 {
  96     BSFCompatContext *priv = bsfc->priv_data;
  97     AVPacket pkt = { 0 };
  98     int ret;
  99
 100     if (!priv->ctx) {
 101         ret = av_bsf_alloc(bsfc->filter, &priv->ctx);
 102         if (ret < 0)
 103             return ret;
 104
 105         ret = avcodec_parameters_from_context(priv->ctx->par_in, avctx);
 106         if (ret < 0)
 107             return ret;
 108
 109         priv->ctx->time_base_in = avctx->time_base;
 110
 111         ret = av_bsf_init(priv->ctx);
 112         if (ret < 0)
 113             return ret;
 114
 115         if (priv->ctx->par_out->extradata_size) {
 116             av_freep(&avctx->extradata);
 117             avctx->extradata_size = 0;
 118             avctx->extradata = av_mallocz(priv->ctx->par_out->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
 119             if (!avctx->extradata)
 120                 return AVERROR(ENOMEM);
 121             memcpy(avctx->extradata, priv->ctx->par_out->extradata,
 122                    priv->ctx->par_out->extradata_size);
 123             avctx->extradata_size = priv->ctx->par_out->extradata_size;
 124         }
 125     }
 126
 127     pkt.data = buf;
 128     pkt.size = buf_size;
 129
 130     ret = av_bsf_send_packet(priv->ctx, &pkt);
 131     if (ret < 0)
 132         return ret;
 133
 134     *poutbuf      = NULL;
 135     *poutbuf_size = 0;
 136
 137     ret = av_bsf_receive_packet(priv->ctx, &pkt);
 138     if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
 139         return 0;
 140     else if (ret < 0)
 141         return ret;
 142
 143     *poutbuf = av_malloc(pkt.size + AV_INPUT_BUFFER_PADDING_SIZE);
 144     if (!*poutbuf) {
 145         av_packet_unref(&pkt);
 146         return AVERROR(ENOMEM);
 147     }
 148
 149     *poutbuf_size = pkt.size;
 150     memcpy(*poutbuf, pkt.data, pkt.size);
 151
 152     av_packet_unref(&pkt);
 153
 154     /* drain all the remaining packets we cannot return */
 155     while (ret >= 0) {
 156         ret = av_bsf_receive_packet(priv->ctx, &pkt);
 157         av_packet_unref(&pkt);
 158     }
 159
 160     return 1;
 161 }
 162 FF_ENABLE_DEPRECATION_WARNINGS
 163 #endif