mirror of
https://github.com/pineappleEA/pineapple-src.git
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192 lines
6.4 KiB
C
Executable File
192 lines
6.4 KiB
C
Executable File
/*
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* Raw FLAC picture parser
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/png.h"
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#include "avformat.h"
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#include "flac_picture.h"
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#include "id3v2.h"
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#include "internal.h"
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#define MAX_TRUNC_PICTURE_SIZE (500 * 1024 * 1024)
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int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size, int truncate_workaround)
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{
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const CodecMime *mime = ff_id3v2_mime_tags;
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enum AVCodecID id = AV_CODEC_ID_NONE;
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AVBufferRef *data = NULL;
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uint8_t mimetype[64], *desc = NULL;
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GetByteContext g;
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AVStream *st;
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int width, height, ret = 0;
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unsigned int type;
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uint32_t len, left, trunclen = 0;
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if (buf_size < 34) {
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av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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bytestream2_init(&g, buf, buf_size);
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/* read the picture type */
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type = bytestream2_get_be32u(&g);
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if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
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av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
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if (s->error_recognition & AV_EF_EXPLODE) {
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return AVERROR_INVALIDDATA;
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}
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type = 0;
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}
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/* picture mimetype */
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len = bytestream2_get_be32u(&g);
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if (len <= 0 || len >= sizeof(mimetype)) {
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av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
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"picture.\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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if (len + 24 > bytestream2_get_bytes_left(&g)) {
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av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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bytestream2_get_bufferu(&g, mimetype, len);
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mimetype[len] = 0;
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while (mime->id != AV_CODEC_ID_NONE) {
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if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
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id = mime->id;
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break;
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}
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mime++;
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}
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if (id == AV_CODEC_ID_NONE) {
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av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
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mimetype);
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if (s->error_recognition & AV_EF_EXPLODE)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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/* picture description */
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len = bytestream2_get_be32u(&g);
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if (len > bytestream2_get_bytes_left(&g) - 20) {
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av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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if (len > 0) {
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if (!(desc = av_malloc(len + 1))) {
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return AVERROR(ENOMEM);
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}
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bytestream2_get_bufferu(&g, desc, len);
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desc[len] = 0;
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}
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/* picture metadata */
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width = bytestream2_get_be32u(&g);
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height = bytestream2_get_be32u(&g);
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bytestream2_skipu(&g, 8);
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/* picture data */
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len = bytestream2_get_be32u(&g);
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left = bytestream2_get_bytes_left(&g);
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if (len <= 0 || len > left) {
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if (len > MAX_TRUNC_PICTURE_SIZE || len >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
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av_log(s, AV_LOG_ERROR, "Attached picture metadata block too big %u\n", len);
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if (s->error_recognition & AV_EF_EXPLODE)
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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// Workaround bug for flac muxers that writs truncated metadata picture block size if
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// the picture size do not fit in 24 bits. lavf flacenc used to have the issue and based
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// on existing broken files other unknown flac muxers seems to truncate also.
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if (truncate_workaround &&
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s->strict_std_compliance <= FF_COMPLIANCE_NORMAL &&
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len > left && (len & 0xffffff) == left) {
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av_log(s, AV_LOG_INFO, "Correcting truncated metadata picture size from %u to %u\n", left, len);
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trunclen = len - left;
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} else {
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av_log(s, AV_LOG_ERROR, "Attached picture metadata block too short\n");
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if (s->error_recognition & AV_EF_EXPLODE)
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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}
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if (!(data = av_buffer_alloc(len + AV_INPUT_BUFFER_PADDING_SIZE))) {
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RETURN_ERROR(AVERROR(ENOMEM));
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}
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if (trunclen == 0) {
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bytestream2_get_bufferu(&g, data->data, len);
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} else {
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// If truncation was detected copy all data from block and read missing bytes
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// not included in the block size
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bytestream2_get_bufferu(&g, data->data, left);
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if (avio_read(s->pb, data->data + len - trunclen, trunclen) < trunclen)
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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memset(data->data + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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if (AV_RB64(data->data) == PNGSIG)
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id = AV_CODEC_ID_PNG;
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st = avformat_new_stream(s, NULL);
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if (!st) {
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RETURN_ERROR(AVERROR(ENOMEM));
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}
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av_init_packet(&st->attached_pic);
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st->attached_pic.buf = data;
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st->attached_pic.data = data->data;
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st->attached_pic.size = len;
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st->attached_pic.stream_index = st->index;
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st->attached_pic.flags |= AV_PKT_FLAG_KEY;
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st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = id;
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st->codecpar->width = width;
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st->codecpar->height = height;
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av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
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if (desc)
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av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
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return 0;
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fail:
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av_buffer_unref(&data);
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av_freep(&desc);
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return ret;
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}
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