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af97c9865f
Some flac muxers write truncated metadata picture size if the picture
data do not fit in 24 bits. Detect this by truncting the size found inside
the picture block and if it matches the block size use it and read rest
of picture data.
This workaround is only for flac files and not ogg files with flac
METADATA_BLOCK_PICTURE comments and it can be disabled with strict level
above normal. Currently there is a 500MB limit on truncate size to protect
from large memory allocations.
The truncation bug in lavf flacenc was fixed in e447a4d112
but based on existing broken files other unknown flac muxers seems to truncate also.
Before the fix a broken flac file for reproduction could be generated with:
ffmpeg -f lavfi -i sine -f lavfi -i color=red:size=2400x2400 -map 0:0 -map 1:0 -c✌️0 bmp -disposition:1 attached_pic -t 1 test.flac
Fixes ticket 6333
Signed-off-by: Anton Khirnov <anton@khirnov.net>
348 lines
12 KiB
C
348 lines
12 KiB
C
/*
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* Raw FLAC demuxer
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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 "libavcodec/flac.h"
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#include "avformat.h"
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#include "flac_picture.h"
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#include "internal.h"
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#include "rawdec.h"
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#include "oggdec.h"
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#include "vorbiscomment.h"
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#include "replaygain.h"
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#define SEEKPOINT_SIZE 18
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typedef struct FLACDecContext {
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AVClass *class;
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int raw_packet_size;
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int found_seektable;
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} FLACDecContext;
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static void reset_index_position(int64_t metadata_head_size, AVStream *st)
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{
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/* the real seek index offset should be the size of metadata blocks with the offset in the frame blocks */
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int i;
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for(i=0; i<st->nb_index_entries; i++) {
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st->index_entries[i].pos += metadata_head_size;
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}
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}
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static int flac_read_header(AVFormatContext *s)
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{
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int ret, metadata_last=0, metadata_type, metadata_size, found_streaminfo=0;
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uint8_t header[4];
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uint8_t *buffer=NULL;
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FLACDecContext *flac = s->priv_data;
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_FLAC;
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st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
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/* the parameters will be extracted from the compressed bitstream */
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/* if fLaC marker is not found, assume there is no header */
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if (avio_rl32(s->pb) != MKTAG('f','L','a','C')) {
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avio_seek(s->pb, -4, SEEK_CUR);
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return 0;
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}
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/* process metadata blocks */
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while (!avio_feof(s->pb) && !metadata_last) {
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if (avio_read(s->pb, header, 4) != 4)
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return AVERROR(AVERROR_INVALIDDATA);
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flac_parse_block_header(header, &metadata_last, &metadata_type,
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&metadata_size);
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switch (metadata_type) {
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/* allocate and read metadata block for supported types */
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case FLAC_METADATA_TYPE_STREAMINFO:
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case FLAC_METADATA_TYPE_CUESHEET:
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case FLAC_METADATA_TYPE_PICTURE:
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case FLAC_METADATA_TYPE_VORBIS_COMMENT:
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case FLAC_METADATA_TYPE_SEEKTABLE:
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buffer = av_mallocz(metadata_size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!buffer) {
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return AVERROR(ENOMEM);
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}
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if (avio_read(s->pb, buffer, metadata_size) != metadata_size) {
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RETURN_ERROR(AVERROR(EIO));
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}
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break;
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/* skip metadata block for unsupported types */
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default:
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ret = avio_skip(s->pb, metadata_size);
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if (ret < 0)
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return ret;
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}
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if (metadata_type == FLAC_METADATA_TYPE_STREAMINFO) {
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uint32_t samplerate;
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uint64_t samples;
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/* STREAMINFO can only occur once */
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if (found_streaminfo) {
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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if (metadata_size != FLAC_STREAMINFO_SIZE) {
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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found_streaminfo = 1;
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st->codecpar->extradata = buffer;
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st->codecpar->extradata_size = metadata_size;
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buffer = NULL;
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/* get sample rate and sample count from STREAMINFO header;
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* other parameters will be extracted by the parser */
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samplerate = AV_RB24(st->codecpar->extradata + 10) >> 4;
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samples = (AV_RB64(st->codecpar->extradata + 13) >> 24) & ((1ULL << 36) - 1);
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/* set time base and duration */
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if (samplerate > 0) {
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avpriv_set_pts_info(st, 64, 1, samplerate);
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if (samples > 0)
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st->duration = samples;
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}
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} else if (metadata_type == FLAC_METADATA_TYPE_CUESHEET) {
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uint8_t isrc[13];
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uint64_t start;
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const uint8_t *offset;
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int i, chapters, track, ti;
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if (metadata_size < 431)
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RETURN_ERROR(AVERROR_INVALIDDATA);
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offset = buffer + 395;
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chapters = bytestream_get_byte(&offset) - 1;
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if (chapters <= 0)
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RETURN_ERROR(AVERROR_INVALIDDATA);
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for (i = 0; i < chapters; i++) {
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if (offset + 36 - buffer > metadata_size)
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RETURN_ERROR(AVERROR_INVALIDDATA);
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start = bytestream_get_be64(&offset);
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track = bytestream_get_byte(&offset);
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bytestream_get_buffer(&offset, isrc, 12);
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isrc[12] = 0;
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offset += 14;
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ti = bytestream_get_byte(&offset);
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if (ti <= 0) RETURN_ERROR(AVERROR_INVALIDDATA);
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offset += ti * 12;
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avpriv_new_chapter(s, track, st->time_base, start, AV_NOPTS_VALUE, isrc);
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}
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av_freep(&buffer);
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} else if (metadata_type == FLAC_METADATA_TYPE_PICTURE) {
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ret = ff_flac_parse_picture(s, buffer, metadata_size, 1);
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av_freep(&buffer);
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if (ret < 0) {
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av_log(s, AV_LOG_ERROR, "Error parsing attached picture.\n");
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return ret;
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}
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} else if (metadata_type == FLAC_METADATA_TYPE_SEEKTABLE) {
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const uint8_t *seekpoint = buffer;
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int i, seek_point_count = metadata_size/SEEKPOINT_SIZE;
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flac->found_seektable = 1;
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if ((s->flags&AVFMT_FLAG_FAST_SEEK)) {
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for(i=0; i<seek_point_count; i++) {
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int64_t timestamp = bytestream_get_be64(&seekpoint);
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int64_t pos = bytestream_get_be64(&seekpoint);
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/* skip number of samples */
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bytestream_get_be16(&seekpoint);
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av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
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}
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}
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av_freep(&buffer);
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}
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else {
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/* STREAMINFO must be the first block */
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if (!found_streaminfo) {
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RETURN_ERROR(AVERROR_INVALIDDATA);
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}
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/* process supported blocks other than STREAMINFO */
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if (metadata_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
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AVDictionaryEntry *chmask;
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ret = ff_vorbis_comment(s, &s->metadata, buffer, metadata_size, 1);
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if (ret < 0) {
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av_log(s, AV_LOG_WARNING, "error parsing VorbisComment metadata\n");
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} else if (ret > 0) {
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s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
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}
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/* parse the channels mask if present */
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chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
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if (chmask) {
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uint64_t mask = strtol(chmask->value, NULL, 0);
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if (!mask || mask & ~0x3ffffULL) {
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av_log(s, AV_LOG_WARNING,
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"Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
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} else {
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st->codecpar->channel_layout = mask;
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av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
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}
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}
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}
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av_freep(&buffer);
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}
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}
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ret = ff_replaygain_export(st, s->metadata);
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if (ret < 0)
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return ret;
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reset_index_position(avio_tell(s->pb), st);
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return 0;
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fail:
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av_free(buffer);
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return ret;
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}
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static int raw_flac_probe(const AVProbeData *p)
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{
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if ((p->buf[2] & 0xF0) == 0) // blocksize code invalid
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return 0;
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if ((p->buf[2] & 0x0F) == 0x0F) // sample rate code invalid
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return 0;
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if ((p->buf[3] & 0xF0) >= FLAC_MAX_CHANNELS + FLAC_CHMODE_MID_SIDE << 4)
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// channel mode invalid
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return 0;
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if ((p->buf[3] & 0x06) == 0x06) // bits per sample code invalid
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return 0;
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if ((p->buf[3] & 0x01) == 0x01) // reserved bit set
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return 0;
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return AVPROBE_SCORE_EXTENSION / 4 + 1;
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}
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static int flac_probe(const AVProbeData *p)
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{
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if ((AV_RB16(p->buf) & 0xFFFE) == 0xFFF8)
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return raw_flac_probe(p);
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/* file header + metadata header + checked bytes of streaminfo */
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if (p->buf_size >= 4 + 4 + 13) {
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int type = p->buf[4] & 0x7f;
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int size = AV_RB24(p->buf + 5);
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int min_block_size = AV_RB16(p->buf + 8);
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int max_block_size = AV_RB16(p->buf + 10);
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int sample_rate = AV_RB24(p->buf + 18) >> 4;
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if (memcmp(p->buf, "fLaC", 4))
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return 0;
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if (type == FLAC_METADATA_TYPE_STREAMINFO &&
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size == FLAC_STREAMINFO_SIZE &&
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min_block_size >= 16 &&
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max_block_size >= min_block_size &&
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sample_rate && sample_rate <= 655350)
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return AVPROBE_SCORE_MAX;
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return AVPROBE_SCORE_EXTENSION;
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}
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return 0;
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}
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static av_unused int64_t flac_read_timestamp(AVFormatContext *s, int stream_index,
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int64_t *ppos, int64_t pos_limit)
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{
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AVPacket pkt;
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AVStream *st = s->streams[stream_index];
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AVCodecParserContext *parser;
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int ret;
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int64_t pts = AV_NOPTS_VALUE;
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if (avio_seek(s->pb, *ppos, SEEK_SET) < 0)
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return AV_NOPTS_VALUE;
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av_init_packet(&pkt);
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parser = av_parser_init(st->codecpar->codec_id);
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if (!parser){
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return AV_NOPTS_VALUE;
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}
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parser->flags |= PARSER_FLAG_USE_CODEC_TS;
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for (;;){
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uint8_t *data;
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int size;
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ret = ff_raw_read_partial_packet(s, &pkt);
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if (ret < 0){
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if (ret == AVERROR(EAGAIN))
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continue;
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else {
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av_packet_unref(&pkt);
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av_assert1(!pkt.size);
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}
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}
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av_parser_parse2(parser, st->internal->avctx,
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&data, &size, pkt.data, pkt.size,
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pkt.pts, pkt.dts, *ppos);
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av_packet_unref(&pkt);
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if (size) {
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if (parser->pts != AV_NOPTS_VALUE){
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// seeking may not have started from beginning of a frame
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// calculate frame start position from next frame backwards
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*ppos = parser->next_frame_offset - size;
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pts = parser->pts;
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break;
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}
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} else if (ret < 0)
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break;
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}
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av_parser_close(parser);
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return pts;
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}
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static int flac_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) {
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int index;
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int64_t pos;
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AVIndexEntry e;
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FLACDecContext *flac = s->priv_data;
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if (!flac->found_seektable || !(s->flags&AVFMT_FLAG_FAST_SEEK)) {
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return -1;
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}
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index = av_index_search_timestamp(s->streams[0], timestamp, flags);
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if(index<0 || index >= s->streams[0]->nb_index_entries)
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return -1;
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e = s->streams[0]->index_entries[index];
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pos = avio_seek(s->pb, e.pos, SEEK_SET);
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if (pos >= 0) {
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return 0;
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}
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return -1;
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}
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FF_RAW_DEMUXER_CLASS(flac)
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AVInputFormat ff_flac_demuxer = {
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.name = "flac",
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.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
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.read_probe = flac_probe,
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.read_header = flac_read_header,
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.read_packet = ff_raw_read_partial_packet,
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.read_seek = flac_seek,
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.read_timestamp = flac_read_timestamp,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "flac",
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.raw_codec_id = AV_CODEC_ID_FLAC,
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.priv_data_size = sizeof(FLACDecContext),
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.priv_class = &flac_demuxer_class,
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};
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