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/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "libavutil/log.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bsf.h"
struct AVBSFInternal {
AVPacket *buffer_pkt;
int eof;
};
void av_bsf_free(AVBSFContext **pctx)
{
AVBSFContext *ctx;
if (!pctx || !*pctx)
return;
ctx = *pctx;
if (ctx->filter->close)
ctx->filter->close(ctx);
if (ctx->filter->priv_class && ctx->priv_data)
av_opt_free(ctx->priv_data);
av_opt_free(ctx);
av_packet_free(&ctx->internal->buffer_pkt);
av_freep(&ctx->internal);
av_freep(&ctx->priv_data);
avcodec_parameters_free(&ctx->par_in);
avcodec_parameters_free(&ctx->par_out);
av_freep(pctx);
}
static void *bsf_child_next(void *obj, void *prev)
{
AVBSFContext *ctx = obj;
if (!prev && ctx->filter->priv_class)
return ctx->priv_data;
return NULL;
}
static const AVClass bsf_class = {
.class_name = "AVBSFContext",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
.child_next = bsf_child_next,
.child_class_next = ff_bsf_child_class_next,
};
const AVClass *av_bsf_get_class(void)
{
return &bsf_class;
}
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
{
AVBSFContext *ctx;
int ret;
ctx = av_mallocz(sizeof(*ctx));
if (!ctx)
return AVERROR(ENOMEM);
ctx->av_class = &bsf_class;
ctx->filter = filter;
ctx->par_in = avcodec_parameters_alloc();
ctx->par_out = avcodec_parameters_alloc();
if (!ctx->par_in || !ctx->par_out) {
ret = AVERROR(ENOMEM);
goto fail;
}
ctx->internal = av_mallocz(sizeof(*ctx->internal));
if (!ctx->internal) {
ret = AVERROR(ENOMEM);
goto fail;
}
ctx->internal->buffer_pkt = av_packet_alloc();
if (!ctx->internal->buffer_pkt) {
ret = AVERROR(ENOMEM);
goto fail;
}
av_opt_set_defaults(ctx);
/* allocate priv data and init private options */
if (filter->priv_data_size) {
ctx->priv_data = av_mallocz(filter->priv_data_size);
if (!ctx->priv_data) {
ret = AVERROR(ENOMEM);
goto fail;
}
if (filter->priv_class) {
*(const AVClass **)ctx->priv_data = filter->priv_class;
av_opt_set_defaults(ctx->priv_data);
}
}
*pctx = ctx;
return 0;
fail:
av_bsf_free(&ctx);
return ret;
}
int av_bsf_init(AVBSFContext *ctx)
{
int ret, i;
/* check that the codec is supported */
if (ctx->filter->codec_ids) {
for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
break;
if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
"bitstream filter '%s'. Supported codecs are: ",
desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
}
av_log(ctx, AV_LOG_ERROR, "\n");
return AVERROR(EINVAL);
}
}
/* initialize output parameters to be the same as input
* init below might overwrite that */
ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
if (ret < 0)
return ret;
ctx->time_base_out = ctx->time_base_in;
if (ctx->filter->init) {
ret = ctx->filter->init(ctx);
if (ret < 0)
return ret;
}
return 0;
}
void av_bsf_flush(AVBSFContext *ctx)
{
ctx->internal->eof = 0;
av_packet_unref(ctx->internal->buffer_pkt);
if (ctx->filter->flush)
ctx->filter->flush(ctx);
}
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
{
if (!pkt || !pkt->data) {
ctx->internal->eof = 1;
return 0;
}
if (ctx->internal->eof) {
av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
return AVERROR(EINVAL);
}
if (ctx->internal->buffer_pkt->data ||
ctx->internal->buffer_pkt->side_data_elems)
return AVERROR(EAGAIN);
av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
return 0;
}
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
{
return ctx->filter->filter(ctx, pkt);
}
int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
{
AVBSFInternal *in = ctx->internal;
AVPacket *tmp_pkt;
if (in->eof)
return AVERROR_EOF;
if (!ctx->internal->buffer_pkt->data &&
!ctx->internal->buffer_pkt->side_data_elems)
return AVERROR(EAGAIN);
tmp_pkt = av_packet_alloc();
if (!tmp_pkt)
return AVERROR(ENOMEM);
*pkt = ctx->internal->buffer_pkt;
ctx->internal->buffer_pkt = tmp_pkt;
return 0;
}
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