libavcodec/bsf.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include <string.h>
  20
  21 #include "libavutil/log.h"
  22 #include "libavutil/mem.h"
  23 #include "libavutil/opt.h"
  24
  25 #include "avcodec.h"
  26 #include "bsf.h"
  27
  28 struct AVBSFInternal {
  29     AVPacket *buffer_pkt;
  30     int eof;
  31 };
  32
  33 void av_bsf_free(AVBSFContext **pctx)
  34 {
  35     AVBSFContext *ctx;
  36
  37     if (!pctx || !*pctx)
  38         return;
  39     ctx = *pctx;
  40
  41     if (ctx->filter->close)
  42         ctx->filter->close(ctx);
  43     if (ctx->filter->priv_class && ctx->priv_data)
  44         av_opt_free(ctx->priv_data);
  45
  46     av_opt_free(ctx);
  47
  48     av_packet_free(&ctx->internal->buffer_pkt);
  49     av_freep(&ctx->internal);
  50     av_freep(&ctx->priv_data);
  51
  52     avcodec_parameters_free(&ctx->par_in);
  53     avcodec_parameters_free(&ctx->par_out);
  54
  55     av_freep(pctx);
  56 }
  57
  58 static void *bsf_child_next(void *obj, void *prev)
  59 {
  60     AVBSFContext *ctx = obj;
  61     if (!prev && ctx->filter->priv_class)
  62         return ctx->priv_data;
  63     return NULL;
  64 }
  65
  66 static const AVClass bsf_class = {
  67     .class_name       = "AVBSFContext",
  68     .item_name        = av_default_item_name,
  69     .version          = LIBAVUTIL_VERSION_INT,
  70     .child_next       = bsf_child_next,
  71     .child_class_next = ff_bsf_child_class_next,
  72 };
  73
  74 const AVClass *av_bsf_get_class(void)
  75 {
  76     return &bsf_class;
  77 }
  78
  79 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
  80 {
  81     AVBSFContext *ctx;
  82     int ret;
  83
  84     ctx = av_mallocz(sizeof(*ctx));
  85     if (!ctx)
  86         return AVERROR(ENOMEM);
  87
  88     ctx->av_class = &bsf_class;
  89     ctx->filter   = filter;
  90
  91     ctx->par_in  = avcodec_parameters_alloc();
  92     ctx->par_out = avcodec_parameters_alloc();
  93     if (!ctx->par_in || !ctx->par_out) {
  94         ret = AVERROR(ENOMEM);
  95         goto fail;
  96     }
  97
  98     ctx->internal = av_mallocz(sizeof(*ctx->internal));
  99     if (!ctx->internal) {
 100         ret = AVERROR(ENOMEM);
 101         goto fail;
 102     }
 103
 104     ctx->internal->buffer_pkt = av_packet_alloc();
 105     if (!ctx->internal->buffer_pkt) {
 106         ret = AVERROR(ENOMEM);
 107         goto fail;
 108     }
 109
 110     av_opt_set_defaults(ctx);
 111
 112     /* allocate priv data and init private options */
 113     if (filter->priv_data_size) {
 114         ctx->priv_data = av_mallocz(filter->priv_data_size);
 115         if (!ctx->priv_data) {
 116             ret = AVERROR(ENOMEM);
 117             goto fail;
 118         }
 119         if (filter->priv_class) {
 120             *(const AVClass **)ctx->priv_data = filter->priv_class;
 121             av_opt_set_defaults(ctx->priv_data);
 122         }
 123     }
 124
 125     *pctx = ctx;
 126     return 0;
 127 fail:
 128     av_bsf_free(&ctx);
 129     return ret;
 130 }
 131
 132 int av_bsf_init(AVBSFContext *ctx)
 133 {
 134     int ret, i;
 135
 136     /* check that the codec is supported */
 137     if (ctx->filter->codec_ids) {
 138         for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
 139             if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
 140                 break;
 141         if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
 142             const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
 143             av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
 144                    "bitstream filter '%s'. Supported codecs are: ",
 145                    desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
 146             for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
 147                 desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
 148                 av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
 149                        desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
 150             }
 151             av_log(ctx, AV_LOG_ERROR, "\n");
 152             return AVERROR(EINVAL);
 153         }
 154     }
 155
 156     /* initialize output parameters to be the same as input
 157      * init below might overwrite that */
 158     ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
 159     if (ret < 0)
 160         return ret;
 161
 162     ctx->time_base_out = ctx->time_base_in;
 163
 164     if (ctx->filter->init) {
 165         ret = ctx->filter->init(ctx);
 166         if (ret < 0)
 167             return ret;
 168     }
 169
 170     return 0;
 171 }
 172
 173 void av_bsf_flush(AVBSFContext *ctx)
 174 {
 175     ctx->internal->eof = 0;
 176
 177     av_packet_unref(ctx->internal->buffer_pkt);
 178
 179     if (ctx->filter->flush)
 180         ctx->filter->flush(ctx);
 181 }
 182
 183 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
 184 {
 185     if (!pkt || !pkt->data) {
 186         ctx->internal->eof = 1;
 187         return 0;
 188     }
 189
 190     if (ctx->internal->eof) {
 191         av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
 192         return AVERROR(EINVAL);
 193     }
 194
 195     if (ctx->internal->buffer_pkt->data ||
 196         ctx->internal->buffer_pkt->side_data_elems)
 197         return AVERROR(EAGAIN);
 198
 199     av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
 200
 201     return 0;
 202 }
 203
 204 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
 205 {
 206     return ctx->filter->filter(ctx, pkt);
 207 }
 208
 209 int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
 210 {
 211     AVBSFInternal *in = ctx->internal;
 212     AVPacket *tmp_pkt;
 213
 214     if (in->eof)
 215         return AVERROR_EOF;
 216
 217     if (!ctx->internal->buffer_pkt->data &&
 218         !ctx->internal->buffer_pkt->side_data_elems)
 219         return AVERROR(EAGAIN);
 220
 221     tmp_pkt = av_packet_alloc();
 222     if (!tmp_pkt)
 223         return AVERROR(ENOMEM);
 224
 225     *pkt = ctx->internal->buffer_pkt;
 226     ctx->internal->buffer_pkt = tmp_pkt;
 227
 228     return 0;
 229 }
 230
 231 int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
 232 {
 233     AVBSFInternal *in = ctx->internal;
 234
 235     if (in->eof)
 236         return AVERROR_EOF;
 237
 238     if (!ctx->internal->buffer_pkt->data &&
 239         !ctx->internal->buffer_pkt->side_data_elems)
 240         return AVERROR(EAGAIN);
 241
 242     av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
 243
 244     return 0;
 245 }