flac_picture.c 4.45 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
/*
 * Raw FLAC picture parser
 *
 * 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 "avformat.h"
#include "flac_picture.h"
#include "id3v2.h"
#include "internal.h"

int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
{
    const CodecMime *mime = ff_id3v2_mime_tags;
    enum AVCodecID id = AV_CODEC_ID_NONE;
    AVBufferRef *data = NULL;
    uint8_t mimetype[64], *desc = NULL;
    AVIOContext *pb = NULL;
    AVStream *st;
    int type, width, height;
    int len, ret = 0;

    pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
    if (!pb)
        return AVERROR(ENOMEM);

    /* read the picture type */
    type = avio_rb32(pb);
    if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
        av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
        if (s->error_recognition & AV_EF_EXPLODE) {
            ret = AVERROR_INVALIDDATA;
            goto fail;
        }
        type = 0;
    }

    /* picture mimetype */
    len = avio_rb32(pb);
    if (len <= 0 ||
        avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
        av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
               "picture.\n");
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR_INVALIDDATA;
        goto fail;
    }
    mimetype[len] = 0;

    while (mime->id != AV_CODEC_ID_NONE) {
        if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
            id = mime->id;
            break;
        }
        mime++;
    }
    if (id == AV_CODEC_ID_NONE) {
        av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
               mimetype);
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    /* picture description */
    len = avio_rb32(pb);
    if (len > 0) {
        if (!(desc = av_malloc(len + 1))) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }

        if (avio_read(pb, desc, len) != len) {
            av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
            if (s->error_recognition & AV_EF_EXPLODE)
                ret = AVERROR(EIO);
            goto fail;
        }
        desc[len] = 0;
    }

    /* picture metadata */
    width  = avio_rb32(pb);
    height = avio_rb32(pb);
    avio_skip(pb, 8);

    /* picture data */
    len = avio_rb32(pb);
    if (len <= 0) {
        av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR_INVALIDDATA;
        goto fail;
    }
    if (!(data = av_buffer_alloc(len))) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }
    if (avio_read(pb, data->data, len) != len) {
        av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
        if (s->error_recognition & AV_EF_EXPLODE)
            ret = AVERROR(EIO);
        goto fail;
    }

    st = avformat_new_stream(s, NULL);
    if (!st) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }

    av_init_packet(&st->attached_pic);
    st->attached_pic.buf          = data;
    st->attached_pic.data         = data->data;
    st->attached_pic.size         = len;
    st->attached_pic.stream_index = st->index;
    st->attached_pic.flags       |= AV_PKT_FLAG_KEY;

    st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    st->codec->codec_id   = id;
    st->codec->width      = width;
    st->codec->height     = height;
    av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
    if (desc)
        av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);

    av_freep(&pb);

    return 0;

fail:
    av_buffer_unref(&data);
    av_freep(&desc);
    av_freep(&pb);

    return ret;
}