PeerStreamer

/*

 * copyright (c) 2009 Michael Niedermayer

 *

 * 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 <strings.h>

#include "avformat.h"

#include "metadata.h"

AVMetadataTag *

av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags)

{

    unsigned int i, j;

    if(!m)

        return NULL;

    if(prev) i= prev - m->elems + 1;

    else     i= 0;

    for(; i<m->count; i++){

        const char *s= m->elems[i].key;

        if(flags & AV_METADATA_MATCH_CASE) for(j=0;         s[j]  ==         key[j]  && key[j]; j++);

        else                               for(j=0; toupper(s[j]) == toupper(key[j]) && key[j]; j++);

        if(key[j])

            continue;

        if(s[j] && !(flags & AV_METADATA_IGNORE_SUFFIX))

            continue;

        return &m->elems[i];

    }

    return NULL;

}

int av_metadata_set2(AVMetadata **pm, const char *key, const char *value, int flags)

{

    AVMetadata *m= *pm;

    AVMetadataTag *tag= av_metadata_get(m, key, NULL, AV_METADATA_MATCH_CASE);

    if(!m)

        m=*pm= av_mallocz(sizeof(*m));

    if(tag){

        if (flags & AV_METADATA_DONT_OVERWRITE)

            return 0;

        av_free(tag->value);

        av_free(tag->key);

        *tag= m->elems[--m->count];

    }else{

        AVMetadataTag *tmp= av_realloc(m->elems, (m->count+1) * sizeof(*m->elems));

        if(tmp){

            m->elems= tmp;

        }else

            return AVERROR(ENOMEM);

    }

    if(value){

        if(flags & AV_METADATA_DONT_STRDUP_KEY){

            m->elems[m->count].key  = key;

        }else

        m->elems[m->count].key  = av_strdup(key  );

        if(flags & AV_METADATA_DONT_STRDUP_VAL){

            m->elems[m->count].value= value;

        }else

        m->elems[m->count].value= av_strdup(value);

        m->count++;

    }

    if(!m->count) {

        av_free(m->elems);

        av_freep(pm);

    }

    return 0;

}

#if FF_API_OLD_METADATA

int av_metadata_set(AVMetadata **pm, const char *key, const char *value)

{

    return av_metadata_set2(pm, key, value, 0);

}

void av_metadata_conv(AVFormatContext *ctx, const AVMetadataConv *d_conv,

                                            const AVMetadataConv *s_conv)

{

    return;

}

#endif

void av_metadata_free(AVMetadata **pm)

{

    AVMetadata *m= *pm;

    if(m){

        while(m->count--){

            av_free(m->elems[m->count].key);

            av_free(m->elems[m->count].value);

        }

        av_free(m->elems);

    }

    av_freep(pm);

}

void metadata_conv(AVMetadata **pm, const AVMetadataConv *d_conv,

                                           const AVMetadataConv *s_conv)

{

    /* TODO: use binary search to look up the two conversion tables

       if the tables are getting big enough that it would matter speed wise */

    const AVMetadataConv *sc, *dc;

    AVMetadataTag *mtag = NULL;

    AVMetadata *dst = NULL;

    const char *key;

    if (d_conv == s_conv)

        return;

    while((mtag=av_metadata_get(*pm, "", mtag, AV_METADATA_IGNORE_SUFFIX))) {

        key = mtag->key;

        if (s_conv)

            for (sc=s_conv; sc->native; sc++)

                if (!strcasecmp(key, sc->native)) {

                    key = sc->generic;

                    break;

                }

        if (d_conv)

            for (dc=d_conv; dc->native; dc++)

                if (!strcasecmp(key, dc->generic)) {

                    key = dc->native;

                    break;

                }

        av_metadata_set2(&dst, key, mtag->value, 0);

    }

    av_metadata_free(pm);

    *pm = dst;

}

void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv,

                                                const AVMetadataConv *s_conv)

{

    int i;

    metadata_conv(&ctx->metadata, d_conv, s_conv);

    for (i=0; i<ctx->nb_streams ; i++)

        metadata_conv(&ctx->streams [i]->metadata, d_conv, s_conv);

    for (i=0; i<ctx->nb_chapters; i++)

        metadata_conv(&ctx->chapters[i]->metadata, d_conv, s_conv);

    for (i=0; i<ctx->nb_programs; i++)

        metadata_conv(&ctx->programs[i]->metadata, d_conv, s_conv);

}