FFmpeg/libavformat/avformat.c

/*
 * Various functions used by both muxers and demuxers
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
 *
 * 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 "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/bsf.h"
#include "libavcodec/packet_internal.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"

void ff_free_stream(AVStream **pst)
{
    AVStream *st = *pst;
    FFStream *const sti = ffstream(st);

    if (!st)
        return;

    for (int i = 0; i < st->nb_side_data; i++)
        av_freep(&st->side_data[i].data);
    av_freep(&st->side_data);

    if (st->attached_pic.data)
        av_packet_unref(&st->attached_pic);

    av_parser_close(sti->parser);
    avcodec_free_context(&sti->avctx);
    av_bsf_free(&sti->bsfc);
    av_freep(&sti->priv_pts);
    av_freep(&sti->index_entries);
    av_freep(&sti->probe_data.buf);

    av_bsf_free(&sti->extract_extradata.bsf);

    if (sti->info) {
        av_freep(&sti->info->duration_error);
        av_freep(&sti->info);
    }

    av_dict_free(&st->metadata);
    avcodec_parameters_free(&st->codecpar);
    av_freep(&st->priv_data);

    av_freep(pst);
}

void ff_remove_stream(AVFormatContext *s, AVStream *st)
{
    av_assert0(s->nb_streams>0);
    av_assert0(s->streams[ s->nb_streams - 1 ] == st);

    ff_free_stream(&s->streams[ --s->nb_streams ]);
}

/* XXX: suppress the packet queue */
void ff_flush_packet_queue(AVFormatContext *s)
{
    FFFormatContext *const si = ffformatcontext(s);
    avpriv_packet_list_free(&si->parse_queue);
    avpriv_packet_list_free(&si->packet_buffer);
    avpriv_packet_list_free(&si->raw_packet_buffer);

    si->raw_packet_buffer_size = 0;
}

void avformat_free_context(AVFormatContext *s)
{
    FFFormatContext *si;

    if (!s)
        return;
    si = ffformatcontext(s);

    if (s->oformat && s->oformat->deinit && si->initialized)
        s->oformat->deinit(s);

    av_opt_free(s);
    if (s->iformat && s->iformat->priv_class && s->priv_data)
        av_opt_free(s->priv_data);
    if (s->oformat && s->oformat->priv_class && s->priv_data)
        av_opt_free(s->priv_data);

    for (unsigned i = 0; i < s->nb_streams; i++)
        ff_free_stream(&s->streams[i]);
    s->nb_streams = 0;

    for (unsigned i = 0; i < s->nb_programs; i++) {
        av_dict_free(&s->programs[i]->metadata);
        av_freep(&s->programs[i]->stream_index);
        av_freep(&s->programs[i]);
    }
    s->nb_programs = 0;

    av_freep(&s->programs);
    av_freep(&s->priv_data);
    while (s->nb_chapters--) {
        av_dict_free(&s->chapters[s->nb_chapters]->metadata);
        av_freep(&s->chapters[s->nb_chapters]);
    }
    av_freep(&s->chapters);
    av_dict_free(&s->metadata);
    av_dict_free(&si->id3v2_meta);
    av_packet_free(&si->pkt);
    av_packet_free(&si->parse_pkt);
    av_freep(&s->streams);
    ff_flush_packet_queue(s);
    av_freep(&s->url);
    av_free(s);
}

uint8_t *av_stream_get_side_data(const AVStream *st,
                                 enum AVPacketSideDataType type, size_t *size)
{
    for (int i = 0; i < st->nb_side_data; i++) {
        if (st->side_data[i].type == type) {
            if (size)
                *size = st->side_data[i].size;
            return st->side_data[i].data;
        }
    }
    if (size)
        *size = 0;
    return NULL;
}

int av_stream_add_side_data(AVStream *st, enum AVPacketSideDataType type,
                            uint8_t *data, size_t size)
{
    AVPacketSideData *sd, *tmp;

    for (int i = 0; i < st->nb_side_data; i++) {
        sd = &st->side_data[i];

        if (sd->type == type) {
            av_freep(&sd->data);
            sd->data = data;
            sd->size = size;
            return 0;
        }
    }

    if (st->nb_side_data + 1U > FFMIN(INT_MAX, SIZE_MAX / sizeof(*tmp)))
        return AVERROR(ERANGE);

    tmp = av_realloc_array(st->side_data, st->nb_side_data + 1, sizeof(*tmp));
    if (!tmp) {
        return AVERROR(ENOMEM);
    }

    st->side_data = tmp;
    st->nb_side_data++;

    sd = &st->side_data[st->nb_side_data - 1];
    sd->type = type;
    sd->data = data;
    sd->size = size;

    return 0;
}

uint8_t *av_stream_new_side_data(AVStream *st, enum AVPacketSideDataType type,
                                 size_t size)
{
    int ret;
    uint8_t *data = av_malloc(size);

    if (!data)
        return NULL;

    ret = av_stream_add_side_data(st, type, data, size);
    if (ret < 0) {
        av_freep(&data);
        return NULL;
    }

    return data;
}