FFmpeg/libavcodec/bsf.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; 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 "libavutil/avstring.h"
#include "libavutil/bprint.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;
}
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
{
if (!pkt || (!pkt->data && !pkt->side_data_elems)) {
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;
}
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
{
AVBSFInternal *in = ctx->internal;
if (in->eof)
return AVERROR_EOF;
if (!ctx->internal->buffer_pkt->data &&
!ctx->internal->buffer_pkt->side_data_elems)
return AVERROR(EAGAIN);
av_packet_move_ref(pkt, ctx->internal->buffer_pkt);
return 0;
}
typedef struct BSFListContext {
const AVClass *class;
AVBSFContext **bsfs;
int nb_bsfs;
unsigned idx; // index of currently processed BSF
unsigned flushed_idx; // index of BSF being flushed
char * item_name;
} BSFListContext;
static int bsf_list_init(AVBSFContext *bsf)
{
BSFListContext *lst = bsf->priv_data;
int ret, i;
const AVCodecParameters *cod_par = bsf->par_in;
AVRational tb = bsf->time_base_in;
for (i = 0; i < lst->nb_bsfs; ++i) {
ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
if (ret < 0)
goto fail;
lst->bsfs[i]->time_base_in = tb;
ret = av_bsf_init(lst->bsfs[i]);
if (ret < 0)
goto fail;
cod_par = lst->bsfs[i]->par_out;
tb = lst->bsfs[i]->time_base_out;
}
bsf->time_base_out = tb;
ret = avcodec_parameters_copy(bsf->par_out, cod_par);
fail:
return ret;
}
static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
{
BSFListContext *lst = bsf->priv_data;
int ret;
if (!lst->nb_bsfs)
return ff_bsf_get_packet_ref(bsf, out);
while (1) {
if (lst->idx > lst->flushed_idx) {
ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
if (ret == AVERROR(EAGAIN)) {
/* no more packets from idx-1, try with previous */
ret = 0;
lst->idx--;
continue;
} else if (ret == AVERROR_EOF) {
/* filter idx-1 is done, continue with idx...nb_bsfs */
lst->flushed_idx = lst->idx;
continue;
}else if (ret < 0) {
/* filtering error */
break;
}
} else {
ret = ff_bsf_get_packet_ref(bsf, out);
if (ret == AVERROR_EOF) {
lst->idx = lst->flushed_idx;
} else if (ret < 0)
break;
}
if (lst->idx < lst->nb_bsfs) {
AVPacket *pkt;
if (ret == AVERROR_EOF && lst->idx == lst->flushed_idx) {
/* ff_bsf_get_packet_ref returned EOF and idx is first
* filter of yet not flushed filter chain */
pkt = NULL;
} else {
pkt = out;
}
ret = av_bsf_send_packet(lst->bsfs[lst->idx], pkt);
if (ret < 0)
break;
lst->idx++;
} else {
/* The end of filter chain, break to return result */
break;
}
}
if (ret < 0)
av_packet_unref(out);
return ret;
}
static void bsf_list_close(AVBSFContext *bsf)
{
BSFListContext *lst = bsf->priv_data;
int i;
for (i = 0; i < lst->nb_bsfs; ++i)
av_bsf_free(&lst->bsfs[i]);
av_freep(&lst->bsfs);
av_freep(&lst->item_name);
}
static const char *bsf_list_item_name(void *ctx)
{
static const char *null_filter_name = "null";
AVBSFContext *bsf_ctx = ctx;
BSFListContext *lst = bsf_ctx->priv_data;
if (!lst->nb_bsfs)
return null_filter_name;
if (!lst->item_name) {
int i;
AVBPrint bp;
av_bprint_init(&bp, 16, 128);
av_bprintf(&bp, "bsf_list(");
for (i = 0; i < lst->nb_bsfs; i++)
av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
av_bprintf(&bp, ")");
av_bprint_finalize(&bp, &lst->item_name);
}
return lst->item_name;
}
static const AVClass bsf_list_class = {
.class_name = "bsf_list",
.item_name = bsf_list_item_name,
.version = LIBAVUTIL_VERSION_INT,
};
const AVBitStreamFilter ff_list_bsf = {
.name = "bsf_list",
.priv_data_size = sizeof(BSFListContext),
.priv_class = &bsf_list_class,
.init = bsf_list_init,
.filter = bsf_list_filter,
.close = bsf_list_close,
};
struct AVBSFList {
AVBSFContext **bsfs;
int nb_bsfs;
};
AVBSFList *av_bsf_list_alloc(void)
{
return av_mallocz(sizeof(AVBSFList));
}
void av_bsf_list_free(AVBSFList **lst)
{
int i;
if (!*lst)
return;
for (i = 0; i < (*lst)->nb_bsfs; ++i)
av_bsf_free(&(*lst)->bsfs[i]);
av_free((*lst)->bsfs);
av_freep(lst);
}
int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
{
return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
}
int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
{
int ret;
const AVBitStreamFilter *filter;
AVBSFContext *bsf;
filter = av_bsf_get_by_name(bsf_name);
if (!filter)
return AVERROR_BSF_NOT_FOUND;
ret = av_bsf_alloc(filter, &bsf);
if (ret < 0)
return ret;
if (options) {
ret = av_opt_set_dict2(bsf, options, AV_OPT_SEARCH_CHILDREN);
if (ret < 0)
goto end;
}
ret = av_bsf_list_append(lst, bsf);
end:
if (ret < 0)
av_bsf_free(&bsf);
return ret;
}
int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
{
int ret = 0;
BSFListContext *ctx;
if ((*lst)->nb_bsfs == 1) {
*bsf = (*lst)->bsfs[0];
av_freep(&(*lst)->bsfs);
(*lst)->nb_bsfs = 0;
goto end;
}
ret = av_bsf_alloc(&ff_list_bsf, bsf);
if (ret < 0)
return ret;
ctx = (*bsf)->priv_data;
ctx->bsfs = (*lst)->bsfs;
ctx->nb_bsfs = (*lst)->nb_bsfs;
end:
av_freep(lst);
return ret;
}
static int bsf_parse_single(const char *str, AVBSFList *bsf_lst)
{
char *bsf_name, *bsf_options_str, *buf;
AVDictionary *bsf_options = NULL;
int ret = 0;
if (!(buf = av_strdup(str)))
return AVERROR(ENOMEM);
bsf_name = av_strtok(buf, "=", &bsf_options_str);
if (!bsf_name) {
ret = AVERROR(EINVAL);
goto end;
}
if (bsf_options_str) {
ret = av_dict_parse_string(&bsf_options, bsf_options_str, "=", ":", 0);
if (ret < 0)
goto end;
}
ret = av_bsf_list_append2(bsf_lst, bsf_name, &bsf_options);
av_dict_free(&bsf_options);
end:
av_free(buf);
return ret;
}
int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
{
AVBSFList *lst;
char *bsf_str, *buf, *dup, *saveptr;
int ret;
if (!str)
return av_bsf_get_null_filter(bsf_lst);
lst = av_bsf_list_alloc();
if (!lst)
return AVERROR(ENOMEM);
if (!(dup = buf = av_strdup(str))) {
ret = AVERROR(ENOMEM);
goto end;
}
while (1) {
bsf_str = av_strtok(buf, ",", &saveptr);
if (!bsf_str)
break;
ret = bsf_parse_single(bsf_str, lst);
if (ret < 0)
goto end;
buf = NULL;
}
ret = av_bsf_list_finalize(&lst, bsf_lst);
end:
if (ret < 0)
av_bsf_list_free(&lst);
av_free(dup);
return ret;
}
int av_bsf_get_null_filter(AVBSFContext **bsf)
{
return av_bsf_alloc(&ff_list_bsf, bsf);
}