/* * 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 "config_components.h" #include "libavutil/avassert.h"#include "libavutil/log.h"#include "libavutil/mem.h"#include "libavutil/opt.h"#include "libavutil/avstring.h"#include "libavutil/bprint.h" #include "bsf.h"#include "bsf_internal.h"#include "codec_desc.h"#include "codec_par.h"#include "packet_internal.h" static av_always_inline const FFBitStreamFilter *ff_bsf(const AVBitStreamFilter *bsf){    return (const FFBitStreamFilter*)bsf;} typedef struct FFBSFContext {    AVBSFContext pub;    AVPacket *buffer_pkt;    int eof;} FFBSFContext; static av_always_inline FFBSFContext *ffbsfcontext(AVBSFContext *ctx){    return (FFBSFContext *)ctx;} void av_bsf_free(AVBSFContext **pctx){    AVBSFContext *ctx;    FFBSFContext *bsfi;     if (!pctx || !*pctx)        return;    ctx  = *pctx;    bsfi = ffbsfcontext(ctx);     if (ctx->priv_data) {        if (ff_bsf(ctx->filter)->close)            ff_bsf(ctx->filter)->close(ctx);        if (ctx->filter->priv_class)            av_opt_free(ctx->priv_data);        av_freep(&ctx->priv_data);    }    av_packet_free(&bsfi->buffer_pkt);     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 char *bsf_to_name(void *bsf){    return ((AVBSFContext *)bsf)->filter->name;} static const AVClass bsf_class = {    .class_name       = "AVBSFContext",    .item_name        = bsf_to_name,    .version          = LIBAVUTIL_VERSION_INT,    .child_next       = bsf_child_next,    .child_class_iterate = ff_bsf_child_class_iterate,    .category         = AV_CLASS_CATEGORY_BITSTREAM_FILTER,}; const AVClass *av_bsf_get_class(void){    return &bsf_class;} int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx){    AVBSFContext *ctx;    FFBSFContext *bsfi;    int ret;     bsfi = av_mallocz(sizeof(*bsfi));    if (!bsfi)        return AVERROR(ENOMEM);    ctx  = &bsfi->pub;     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;    }    /* allocate priv data and init private options */    if (ff_bsf(filter)->priv_data_size) {        ctx->priv_data = av_mallocz(ff_bsf(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);        }    }    bsfi->buffer_pkt = av_packet_alloc();    if (!bsfi->buffer_pkt) {        ret = AVERROR(ENOMEM);        goto fail;    }     *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++) {                enum AVCodecID codec_id = ctx->filter->codec_ids[i];                av_log(ctx, AV_LOG_ERROR, "%s (%d) ",                       avcodec_get_name(codec_id), codec_id);            }            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 (ff_bsf(ctx->filter)->init) {        ret = ff_bsf(ctx->filter)->init(ctx);        if (ret < 0)            return ret;    }     return 0;} void av_bsf_flush(AVBSFContext *ctx){    FFBSFContext *const bsfi = ffbsfcontext(ctx);     bsfi->eof = 0;     av_packet_unref(bsfi->buffer_pkt);     if (ff_bsf(ctx->filter)->flush)        ff_bsf(ctx->filter)->flush(ctx);} int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt){    FFBSFContext *const bsfi = ffbsfcontext(ctx);    int ret;     if (!pkt || AVPACKET_IS_EMPTY(pkt)) {        if (pkt)            av_packet_unref(pkt);        bsfi->eof = 1;        return 0;    }     if (bsfi->eof) {        av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");        return AVERROR(EINVAL);    }     if (!AVPACKET_IS_EMPTY(bsfi->buffer_pkt))        return AVERROR(EAGAIN);     ret = av_packet_make_refcounted(pkt);    if (ret < 0)        return ret;    av_packet_move_ref(bsfi->buffer_pkt, pkt);     return 0;} int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt){    return ff_bsf(ctx->filter)->filter(ctx, pkt);} int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt){    FFBSFContext *const bsfi = ffbsfcontext(ctx);    AVPacket *tmp_pkt;     if (bsfi->eof)        return AVERROR_EOF;     if (AVPACKET_IS_EMPTY(bsfi->buffer_pkt))        return AVERROR(EAGAIN);     tmp_pkt = av_packet_alloc();    if (!tmp_pkt)        return AVERROR(ENOMEM);     *pkt = bsfi->buffer_pkt;    bsfi->buffer_pkt = tmp_pkt;     return 0;} int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt){    FFBSFContext *const bsfi = ffbsfcontext(ctx);     if (bsfi->eof)        return AVERROR_EOF;     if (AVPACKET_IS_EMPTY(bsfi->buffer_pkt))        return AVERROR(EAGAIN);     av_packet_move_ref(pkt, bsfi->buffer_pkt);     return 0;} typedef struct BSFListContext {    const AVClass *class;     AVBSFContext **bsfs;    int nb_bsfs;     unsigned idx;           // index of currently processed BSF     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, eof = 0;     if (!lst->nb_bsfs)        return ff_bsf_get_packet_ref(bsf, out);     while (1) {        /* get a packet from the previous filter up the chain */        if (lst->idx)            ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);        else            ret = ff_bsf_get_packet_ref(bsf, out);        if (ret == AVERROR(EAGAIN)) {            if (!lst->idx)                return ret;            lst->idx--;            continue;        } else if (ret == AVERROR_EOF) {            eof = 1;        } else if (ret < 0)            return ret;         /* send it to the next filter down the chain */        if (lst->idx < lst->nb_bsfs) {            ret = av_bsf_send_packet(lst->bsfs[lst->idx], eof ? NULL : out);            av_assert1(ret != AVERROR(EAGAIN));            if (ret < 0) {                av_packet_unref(out);                return ret;            }            lst->idx++;            eof = 0;        } else if (eof) {            return ret;        } else {            return 0;        }    }} static void bsf_list_flush(AVBSFContext *bsf){    BSFListContext *lst = bsf->priv_data;     for (int i = 0; i < lst->nb_bsfs; i++)        av_bsf_flush(lst->bsfs[i]);    lst->idx = 0;} 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,}; static const FFBitStreamFilter list_bsf = {        .p.name         = "bsf_list",        .p.priv_class   = &bsf_list_class,        .priv_data_size = sizeof(BSFListContext),        .init           = bsf_list_init,        .filter         = bsf_list_filter,        .flush          = bsf_list_flush,        .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);} static int bsf_list_append_internal(AVBSFList *lst, const char *bsf_name, const char *options, AVDictionary ** options_dict){    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 && filter->priv_class) {        const AVOption *opt = av_opt_next(bsf->priv_data, NULL);        const char * shorthand[2] = {NULL};         if (opt)            shorthand[0] = opt->name;         ret = av_opt_set_from_string(bsf->priv_data, options, shorthand, "=", ":");        if (ret < 0)            goto end;    }     if (options_dict) {        ret = av_opt_set_dict2(bsf, options_dict, 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_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options){    return bsf_list_append_internal(lst, bsf_name, NULL, options);} 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;    } 

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