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ffmpeg/libavformat/wvdec.c
Paul B Mahol 3dca5a5c41 wvdec: check for eof in wv_read_block_header() 
Fixes Ticket #3865
Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2014-08-18 11:30:35 +00:00

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/*
* WavPack demuxer
* Copyright (c) 2006,2011 Konstantin Shishkov
*
* 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/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "apetag.h"
#include "id3v1.h"
#include "wv.h"
enum WV_FLAGS {
WV_MONO = 0x0004,
WV_HYBRID = 0x0008,
WV_JOINT = 0x0010,
WV_CROSSD = 0x0020,
WV_HSHAPE = 0x0040,
WV_FLOAT = 0x0080,
WV_INT32 = 0x0100,
WV_HBR = 0x0200,
WV_HBAL = 0x0400,
WV_MCINIT = 0x0800,
WV_MCEND = 0x1000,
};
static const int wv_rates[16] = {
6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
};
typedef struct {
uint8_t block_header[WV_HEADER_SIZE];
WvHeader header;
int rate, chan, bpp;
uint32_t chmask;
int multichannel;
int block_parsed;
int64_t pos;
int64_t apetag_start;
} WVContext;
static int wv_probe(AVProbeData *p)
{
/* check file header */
if (p->buf_size <= 32)
return 0;
if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
AV_RL32(&p->buf[4]) >= 24 &&
AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
AV_RL16(&p->buf[8]) >= 0x402 &&
AV_RL16(&p->buf[8]) <= 0x410)
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
{
WVContext *wc = ctx->priv_data;
int ret;
int rate, bpp, chan;
uint32_t chmask, flags;
wc->pos = avio_tell(pb);
/* don't return bogus packets with the ape tag data */
if (wc->apetag_start && wc->pos >= wc->apetag_start)
return AVERROR_EOF;
ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
if (ret != WV_HEADER_SIZE)
return (ret < 0) ? ret : AVERROR_EOF;
ret = ff_wv_parse_header(&wc->header, wc->block_header);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n");
return ret;
}
if (wc->header.version < 0x402 || wc->header.version > 0x410) {
av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", wc->header.version);
return AVERROR_PATCHWELCOME;
}
/* Blocks with zero samples don't contain actual audio information
* and should be ignored */
if (!wc->header.samples)
return 0;
// parse flags
flags = wc->header.flags;
bpp = ((flags & 3) + 1) << 3;
chan = 1 + !(flags & WV_MONO);
chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
rate = wv_rates[(flags >> 23) & 0xF];
wc->multichannel = !(wc->header.initial && wc->header.final);
if (wc->multichannel) {
chan = wc->chan;
chmask = wc->chmask;
}
if ((rate == -1 || !chan) && !wc->block_parsed) {
int64_t block_end = avio_tell(pb) + wc->header.blocksize;
if (!pb->seekable) {
av_log(ctx, AV_LOG_ERROR,
"Cannot determine additional parameters\n");
return AVERROR_INVALIDDATA;
}
while (avio_tell(pb) < block_end && !avio_feof(pb)) {
int id, size;
id = avio_r8(pb);
size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
size <<= 1;
if (id & 0x40)
size--;
switch (id & 0x3F) {
case 0xD:
if (size <= 1) {
av_log(ctx, AV_LOG_ERROR,
"Insufficient channel information\n");
return AVERROR_INVALIDDATA;
}
chan = avio_r8(pb);
switch (size - 2) {
case 0:
chmask = avio_r8(pb);
break;
case 1:
chmask = avio_rl16(pb);
break;
case 2:
chmask = avio_rl24(pb);
break;
case 3:
chmask = avio_rl32(pb);
break;
case 5:
avio_skip(pb, 1);
chan |= (avio_r8(pb) & 0xF) << 8;
chmask = avio_rl24(pb);
break;
default:
av_log(ctx, AV_LOG_ERROR,
"Invalid channel info size %d\n", size);
return AVERROR_INVALIDDATA;
}
break;
case 0x27:
rate = avio_rl24(pb);
break;
default:
avio_skip(pb, size);
}
if (id & 0x40)
avio_skip(pb, 1);
}
if (rate == -1) {
av_log(ctx, AV_LOG_ERROR,
"Cannot determine custom sampling rate\n");
return AVERROR_INVALIDDATA;
}
avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);
}
if (!wc->bpp)
wc->bpp = bpp;
if (!wc->chan)
wc->chan = chan;
if (!wc->chmask)
wc->chmask = chmask;
if (!wc->rate)
wc->rate = rate;
if (flags && bpp != wc->bpp) {
av_log(ctx, AV_LOG_ERROR,
"Bits per sample differ, this block: %i, header block: %i\n",
bpp, wc->bpp);
return AVERROR_INVALIDDATA;
}
if (flags && !wc->multichannel && chan != wc->chan) {
av_log(ctx, AV_LOG_ERROR,
"Channels differ, this block: %i, header block: %i\n",
chan, wc->chan);
return AVERROR_INVALIDDATA;
}
if (flags && rate != -1 && rate != wc->rate) {
av_log(ctx, AV_LOG_ERROR,
"Sampling rate differ, this block: %i, header block: %i\n",
rate, wc->rate);
return AVERROR_INVALIDDATA;
}
return 0;
}
static int wv_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WVContext *wc = s->priv_data;
AVStream *st;
int ret;
wc->block_parsed = 0;
for (;;) {
if ((ret = wv_read_block_header(s, pb)) < 0)
return ret;
if (!wc->header.samples)
avio_skip(pb, wc->header.blocksize);
else
break;
}
/* now we are ready: build format streams */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = AV_CODEC_ID_WAVPACK;
st->codec->channels = wc->chan;
st->codec->channel_layout = wc->chmask;
st->codec->sample_rate = wc->rate;
st->codec->bits_per_coded_sample = wc->bpp;
avpriv_set_pts_info(st, 64, 1, wc->rate);
st->start_time = 0;
if (wc->header.total_samples != 0xFFFFFFFFu)
st->duration = wc->header.total_samples;
if (s->pb->seekable) {
int64_t cur = avio_tell(s->pb);
wc->apetag_start = ff_ape_parse_tag(s);
if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
ff_id3v1_read(s);
avio_seek(s->pb, cur, SEEK_SET);
}
return 0;
}
static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
WVContext *wc = s->priv_data;
int ret;
int off;
int64_t pos;
uint32_t block_samples;
if (avio_feof(s->pb))
return AVERROR_EOF;
if (wc->block_parsed) {
if ((ret = wv_read_block_header(s, s->pb)) < 0)
return ret;
}
pos = wc->pos;
if (av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE) < 0)
return AVERROR(ENOMEM);
memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
if (ret != wc->header.blocksize) {
av_free_packet(pkt);
return AVERROR(EIO);
}
while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
if ((ret = wv_read_block_header(s, s->pb)) < 0) {
av_free_packet(pkt);
return ret;
}
off = pkt->size;
if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
av_free_packet(pkt);
return ret;
}
memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
if (ret != wc->header.blocksize) {
av_free_packet(pkt);
return (ret < 0) ? ret : AVERROR_EOF;
}
}
pkt->stream_index = 0;
wc->block_parsed = 1;
pkt->pts = wc->header.block_idx;
block_samples = wc->header.samples;
if (block_samples > INT32_MAX)
av_log(s, AV_LOG_WARNING,
"Too many samples in block: %"PRIu32"\n", block_samples);
else
pkt->duration = block_samples;
av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
return 0;
}
static int wv_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
WVContext *wc = s->priv_data;
AVPacket pkt1, *pkt = &pkt1;
int ret;
int index = av_index_search_timestamp(st, timestamp, flags);
int64_t pos, pts;
/* if found, seek there */
if (index >= 0 &&
timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {
wc->block_parsed = 1;
avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
return 0;
}
/* if timestamp is out of bounds, return error */
if (timestamp < 0 || timestamp >= s->duration)
return AVERROR(EINVAL);
pos = avio_tell(s->pb);
do {
ret = av_read_frame(s, pkt);
if (ret < 0) {
avio_seek(s->pb, pos, SEEK_SET);
return ret;
}
pts = pkt->pts;
av_free_packet(pkt);
} while(pts < timestamp);
return 0;
}
AVInputFormat ff_wv_demuxer = {
.name = "wv",
.long_name = NULL_IF_CONFIG_SMALL("WavPack"),
.priv_data_size = sizeof(WVContext),
.read_probe = wv_probe,
.read_header = wv_read_header,
.read_packet = wv_read_packet,
.read_seek = wv_read_seek,
};
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