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FFmpeg/libavformat/wtvdec.c
Michael Niedermayer c390234da2
avformat/wtvdec: Check length of read mpeg2_descriptor 
Fixes: Use of uninitialized value
Fixes: 70900/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-6286909377150976

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2024-08-08 19:10:05 +02:00

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/*
* Windows Television (WTV) demuxer
* Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
*
* 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
*/
/**
* @file
* Windows Television (WTV) demuxer
* @author Peter Ross <pross@xvid.org>
*/
#include <inttypes.h>
#include <time.h>
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/mem.h"
#include "libavutil/time_internal.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#include "wtv.h"
#include "mpegts.h"
/* Macros for formatting GUIDs */
#define PRI_PRETTY_GUID \
"%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
#define ARG_PRETTY_GUID(g) \
AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
#define LEN_PRETTY_GUID 35
/*
* File system routines
*/
typedef struct WtvFile {
AVIOContext *pb_filesystem; /**< file system (AVFormatContext->pb) */
int sector_bits; /**< sector shift bits; used to convert sector number into pb_filesystem offset */
uint32_t *sectors; /**< file allocation table */
int nb_sectors; /**< number of sectors */
int error;
int64_t position;
int64_t length;
} WtvFile;
static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
{
return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
}
/**
* @return bytes read, AVERROR_EOF on end of file, or <0 on error
*/
static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
{
WtvFile *wf = opaque;
AVIOContext *pb = wf->pb_filesystem;
int nread = 0, n = 0;
if (wf->error || pb->error)
return -1;
if (wf->position >= wf->length || avio_feof(pb))
return AVERROR_EOF;
buf_size = FFMIN(buf_size, wf->length - wf->position);
while(nread < buf_size) {
int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
int read_request = FFMIN(buf_size - nread, remaining_in_sector);
n = avio_read(pb, buf, read_request);
if (n <= 0)
break;
nread += n;
buf += n;
wf->position += n;
if (n == remaining_in_sector) {
int i = wf->position >> wf->sector_bits;
if (i >= wf->nb_sectors ||
(wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
wf->error = 1;
break;
}
}
}
return nread ? nread : n;
}
/**
* @return position (or file length)
*/
static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
{
WtvFile *wf = opaque;
AVIOContext *pb = wf->pb_filesystem;
if (whence == AVSEEK_SIZE)
return wf->length;
else if (whence == SEEK_CUR)
offset = wf->position + offset;
else if (whence == SEEK_END)
offset = wf->length;
wf->error = offset < 0 || offset >= wf->length ||
seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
offset & ((1 << wf->sector_bits) - 1)) < 0;
wf->position = offset;
return offset;
}
/**
* read non-zero integers (le32) from input stream
* @param pb
* @param[out] data destination
* @param count maximum number of integers to read
* @return total number of integers read
*/
static int read_ints(AVIOContext *pb, uint32_t *data, int count)
{
int i, total = 0;
for (i = 0; i < count; i++) {
if ((data[total] = avio_rl32(pb)))
total++;
}
return total;
}
/**
* Open file
* @param first_sector First sector
* @param length Length of file (bytes)
* @param depth File allocation table depth
* @return NULL on error
*/
static AVIOContext * wtvfile_open_sector(unsigned first_sector, uint64_t length, int depth, AVFormatContext *s)
{
AVIOContext *pb;
WtvFile *wf;
uint8_t *buffer;
int64_t size;
if (seek_by_sector(s->pb, first_sector, 0) < 0)
return NULL;
wf = av_mallocz(sizeof(WtvFile));
if (!wf)
return NULL;
if (depth == 0) {
wf->sectors = av_malloc(sizeof(uint32_t));
if (!wf->sectors) {
av_free(wf);
return NULL;
}
wf->sectors[0] = first_sector;
wf->nb_sectors = 1;
} else if (depth == 1) {
wf->sectors = av_malloc(WTV_SECTOR_SIZE);
if (!wf->sectors) {
av_free(wf);
return NULL;
}
wf->nb_sectors = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
} else if (depth == 2) {
uint32_t sectors1[WTV_SECTOR_SIZE / 4];
int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
int i;
wf->sectors = av_calloc(nb_sectors1, 1 << WTV_SECTOR_BITS);
if (!wf->sectors) {
av_free(wf);
return NULL;
}
wf->nb_sectors = 0;
for (i = 0; i < nb_sectors1; i++) {
if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
break;
wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
}
} else {
av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
av_free(wf);
return NULL;
}
wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
if (!wf->nb_sectors) {
av_freep(&wf->sectors);
av_freep(&wf);
return NULL;
}
size = avio_size(s->pb);
if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size)
av_log(s, AV_LOG_WARNING, "truncated file\n");
/* check length */
length &= 0xFFFFFFFFFFFF;
if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
length = (int64_t)wf->nb_sectors << wf->sector_bits;
}
wf->length = length;
/* seek to initial sector */
wf->position = 0;
if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
av_freep(&wf->sectors);
av_freep(&wf);
return NULL;
}
wf->pb_filesystem = s->pb;
buffer = av_malloc(1 << wf->sector_bits);
if (!buffer) {
av_freep(&wf->sectors);
av_freep(&wf);
return NULL;
}
pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
wtvfile_read_packet, NULL, wtvfile_seek);
if (!pb) {
av_freep(&buffer);
av_freep(&wf->sectors);
av_freep(&wf);
}
return pb;
}
/**
* Open file using filename
* @param[in] buf directory buffer
* @param buf_size directory buffer size
* @param[in] filename
* @param filename_size size of filename
* @return NULL on error
*/
static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
{
const uint8_t *buf_end = buf + buf_size;
while(buf + 48 <= buf_end) {
int dir_length, name_size, first_sector, depth;
uint64_t file_length;
const uint8_t *name;
if (ff_guidcmp(buf, ff_dir_entry_guid)) {
av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
"remaining directory entries ignored\n", FF_ARG_GUID(buf));
break;
}
dir_length = AV_RL16(buf + 16);
file_length = AV_RL64(buf + 24);
name_size = 2 * AV_RL32(buf + 32);
if (name_size < 0) {
av_log(s, AV_LOG_ERROR,
"bad filename length, remaining directory entries ignored\n");
break;
}
if (dir_length == 0) {
av_log(s, AV_LOG_ERROR,
"bad dir length, remaining directory entries ignored\n");
break;
}
if (48 + (int64_t)name_size > buf_end - buf) {
av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
break;
}
first_sector = AV_RL32(buf + 40 + name_size);
depth = AV_RL32(buf + 44 + name_size);
/* compare file name; test optional null terminator */
name = buf + 40;
if (name_size >= filename_size &&
!memcmp(name, filename, filename_size) &&
(name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
return wtvfile_open_sector(first_sector, file_length, depth, s);
buf += dir_length;
}
return NULL;
}
#define wtvfile_open(s, buf, buf_size, filename) \
wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
/**
* Close file opened with wtvfile_open_sector(), or wtv_open()
*/
static void wtvfile_close(AVIOContext *pb)
{
WtvFile *wf = pb->opaque;
av_freep(&wf->sectors);
av_freep(&pb->opaque);
av_freep(&pb->buffer);
avio_context_free(&pb);
}
/*
* Main demuxer
*/
typedef struct WtvStream {
int seen_data;
} WtvStream;
typedef struct WtvContext {
AVIOContext *pb; /**< timeline file */
int64_t epoch;
int64_t pts; /**< pts for next data chunk */
int64_t last_valid_pts; /**< latest valid pts, used for interactive seeking */
/* maintain private seek index, as the AVIndexEntry->pos is relative to the
start of the 'timeline' file, not the file system (AVFormatContext->pb) */
AVIndexEntry *index_entries;
int nb_index_entries;
unsigned int index_entries_allocated_size;
} WtvContext;
/* WTV GUIDs */
static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
{0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
static const ff_asf_guid EVENTID_LanguageSpanningEvent =
{0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
{0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
{0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
{0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
{0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
{0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
static const ff_asf_guid EVENTID_TeletextSpanningEvent =
{0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
{0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
/* Windows media GUIDs */
/* Media types */
static const ff_asf_guid mediasubtype_mpeg1payload =
{0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
static const ff_asf_guid mediatype_mpeg2_sections =
{0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
static const ff_asf_guid mediatype_mpeg2_pes =
{0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
static const ff_asf_guid mediatype_mstvcaption =
{0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
/* Media subtypes */
static const ff_asf_guid mediasubtype_dvb_subtitle =
{0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
static const ff_asf_guid mediasubtype_teletext =
{0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
static const ff_asf_guid mediasubtype_dtvccdata =
{0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
static const ff_asf_guid mediasubtype_mpeg2_sections =
{0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
static int read_probe(const AVProbeData *p)
{
return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
}
/**
* Convert win32 FILETIME to ISO-8601 string
* @return <0 on error
*/
static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = (value / 10000000LL) - 11644473600LL;
struct tm tmbuf;
struct tm *tm = gmtime_r(&t, &tmbuf);
if (!tm)
return -1;
if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
return -1;
return 0;
}
/**
* Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
* @return <0 on error
*/
static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = (value / 10000000LL) - 719162LL*86400LL;
struct tm tmbuf;
struct tm *tm = gmtime_r(&t, &tmbuf);
if (!tm)
return -1;
if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
return -1;
return 0;
}
/**
* Convert OLE DATE to ISO-8601 string
* @return <0 on error
*/
static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = (av_int2double(value) - 25569.0) * 86400;
struct tm tmbuf;
struct tm *tm= gmtime_r(&t, &tmbuf);
if (!tm)
return -1;
if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
return -1;
return 0;
}
static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
{
char mime[1024];
char description[1024];
unsigned int filesize;
AVStream *st;
int64_t pos = avio_tell(pb);
avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
if (strcmp(mime, "image/jpeg"))
goto done;
avio_r8(pb);
avio_get_str16le(pb, INT_MAX, description, sizeof(description));
filesize = avio_rl32(pb);
if (!filesize)
goto done;
if (ff_add_attached_pic(s, NULL, pb, NULL, filesize) < 0)
goto done;
st = s->streams[s->nb_streams - 1];
av_dict_set(&st->metadata, "title", description, 0);
st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
st->id = -1;
done:
avio_seek(pb, pos + length, SEEK_SET);
}
static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
{
char buf[LEN_PRETTY_GUID + 1], *bufp = buf;
unsigned dict_flags = 0;
if (!strcmp(key, "WM/MediaThumbType")) {
avio_skip(pb, length);
return;
}
if (type == 0 && length == 4) {
snprintf(buf, sizeof(buf), "%u", avio_rl32(pb));
} else if (type == 1) {
int buflen = FFMIN(length + length / 2U + 1, INT_MAX);
bufp = av_malloc(buflen);
if (!bufp)
return;
avio_get_str16le(pb, length, bufp, buflen);
if (!*bufp) {
av_free(bufp);
return;
}
dict_flags = AV_DICT_DONT_STRDUP_VAL;
} else if (type == 3 && length == 4) {
strcpy(buf, avio_rl32(pb) ? "true" : "false");
} else if (type == 4 && length == 8) {
int64_t num = avio_rl64(pb);
if (!strcmp(key, "WM/EncodingTime") ||
!strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
if (filetime_to_iso8601(buf, sizeof(buf), num) < 0)
return;
} else if (!strcmp(key, "WM/WMRVEncodeTime") ||
!strcmp(key, "WM/WMRVEndTime")) {
if (crazytime_to_iso8601(buf, sizeof(buf), num) < 0)
return;
} else if (!strcmp(key, "WM/WMRVExpirationDate")) {
if (oledate_to_iso8601(buf, sizeof(buf), num) < 0)
return;
} else if (!strcmp(key, "WM/WMRVBitrate"))
snprintf(buf, sizeof(buf), "%f", av_int2double(num));
else
snprintf(buf, sizeof(buf), "%"PRIi64, num);
} else if (type == 5 && length == 2) {
snprintf(buf, sizeof(buf), "%u", avio_rl16(pb));
} else if (type == 6 && length == 16) {
ff_asf_guid guid;
avio_read(pb, guid, 16);
snprintf(buf, sizeof(buf), PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
} else if (type == 2 && !strcmp(key, "WM/Picture")) {
get_attachment(s, pb, length);
return;
} else {
av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
avio_skip(pb, length);
return;
}
av_dict_set(&s->metadata, key, bufp, dict_flags);
}
/**
* Parse metadata entries
*/
static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
{
ff_asf_guid guid;
int length, type;
while(!avio_feof(pb)) {
char key[1024];
ff_get_guid(pb, &guid);
type = avio_rl32(pb);
length = avio_rl32(pb);
if (length <= 0)
break;
if (ff_guidcmp(&guid, ff_metadata_guid)) {
av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
"remaining metadata entries ignored\n", FF_ARG_GUID(guid));
break;
}
avio_get_str16le(pb, INT_MAX, key, sizeof(key));
get_tag(s, pb, key, type, length);
}
ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
}
/**
* parse VIDEOINFOHEADER2 structure
* @return bytes consumed
*/
static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
{
WtvContext *wtv = s->priv_data;
AVIOContext *pb = wtv->pb;
avio_skip(pb, 72); // picture aspect ratio is unreliable
st->codecpar->codec_tag = ff_get_bmp_header(pb, st, NULL);
return 72 + 40;
}
/**
* Parse MPEG1WAVEFORMATEX extradata structure
*/
static void parse_mpeg1waveformatex(AVStream *st)
{
/* fwHeadLayer */
switch (AV_RL16(st->codecpar->extradata)) {
case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
}
st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
/* dwHeadMode */
switch (AV_RL16(st->codecpar->extradata + 6)) {
case 1 :
case 2 :
case 4 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
break;
case 8 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
break;
}
}
/**
* Initialise stream
* @param st Stream to initialise, or NULL to create and initialise new stream
* @return NULL on error
*/
static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
{
if (st) {
if (st->codecpar->extradata) {
av_freep(&st->codecpar->extradata);
st->codecpar->extradata_size = 0;
}
} else {
WtvStream *wst = av_mallocz(sizeof(WtvStream));
if (!wst)
return NULL;
st = avformat_new_stream(s, NULL);
if (!st) {
av_free(wst);
return NULL;
}
st->id = sid;
st->priv_data = wst;
}
st->codecpar->codec_type = codec_type;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
avpriv_set_pts_info(st, 64, 1, 10000000);
return st;
}
/**
* parse Media Type structure and populate stream
* @param st Stream, or NULL to create new stream
* @param mediatype Mediatype GUID
* @param subtype Subtype GUID
* @param formattype Format GUID
* @param size Size of format buffer
* @return NULL on error
*/
static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
ff_asf_guid mediatype, ff_asf_guid subtype,
ff_asf_guid formattype, uint64_t size)
{
WtvContext *wtv = s->priv_data;
AVIOContext *pb = wtv->pb;
if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
!ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
ff_asf_guid actual_subtype;
ff_asf_guid actual_formattype;
if (size < 32) {
av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
avio_skip(pb, size);
return NULL;
}
avio_skip(pb, size - 32);
ff_get_guid(pb, &actual_subtype);
ff_get_guid(pb, &actual_formattype);
if (avio_feof(pb))
return NULL;
avio_seek(pb, -size, SEEK_CUR);
st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
avio_skip(pb, 32);
return st;
} else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
if (!st)
return NULL;
if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
int ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
if (ret < 0)
return NULL;
} else {
if (ff_guidcmp(formattype, ff_format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
avio_skip(pb, size);
}
if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
} else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
parse_mpeg1waveformatex(st);
else
av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
} else {
st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
}
return st;
} else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
if (!st)
return NULL;
if (!ff_guidcmp(formattype, ff_format_videoinfo2)) {
int consumed = parse_videoinfoheader2(s, st);
avio_skip(pb, FFMAX(size - consumed, 0));
} else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
uint64_t consumed = parse_videoinfoheader2(s, st);
/* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
avio_skip(pb, FFMAX(size - consumed, 0));
} else {
if (ff_guidcmp(formattype, ff_format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
avio_skip(pb, size);
}
if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
} else {
st->codecpar->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
}
if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
return st;
} else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
!ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
if (!st)
return NULL;
if (ff_guidcmp(formattype, ff_format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
avio_skip(pb, size);
st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
return st;
} else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
(!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
if (!st)
return NULL;
if (ff_guidcmp(formattype, ff_format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
avio_skip(pb, size);
st->codecpar->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
return st;
} else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
!ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
if (ff_guidcmp(formattype, ff_format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
avio_skip(pb, size);
return NULL;
}
av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
avio_skip(pb, size);
return NULL;
}
enum {
SEEK_TO_DATA = 0,
SEEK_TO_PTS,
};
/**
* Try to seek over a broken chunk
* @return <0 on error
*/
static int recover(WtvContext *wtv, uint64_t broken_pos)
{
AVIOContext *pb = wtv->pb;
int i;
for (i = 0; i < wtv->nb_index_entries; i++) {
if (wtv->index_entries[i].pos > broken_pos) {
int64_t ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
if (ret < 0)
return ret;
wtv->pts = wtv->index_entries[i].timestamp;
return 0;
}
}
return AVERROR(EIO);
}
/**
* Parse WTV chunks
* @param mode SEEK_TO_DATA or SEEK_TO_PTS
* @param seekts timestamp
* @param[out] len_ptr Length of data chunk
* @return stream index of data chunk, or <0 on error
*/
static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
{
WtvContext *wtv = s->priv_data;
AVIOContext *pb = wtv->pb;
while (!avio_feof(pb)) {
ff_asf_guid g;
int len, sid, consumed;
ff_get_guid(pb, &g);
len = avio_rl32(pb);
if (len < 32 || len > INT_MAX - 7) {
int ret;
if (avio_feof(pb))
return AVERROR_EOF;
av_log(s, AV_LOG_WARNING, "encountered broken chunk\n");
if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0)
return ret;
continue;
}
sid = avio_rl32(pb) & 0x7FFF;
avio_skip(pb, 8);
consumed = 32;
if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
if (ff_find_stream_index(s, sid) < 0) {
ff_asf_guid mediatype, subtype, formattype;
int size;
avio_skip(pb, 28);
ff_get_guid(pb, &mediatype);
ff_get_guid(pb, &subtype);
avio_skip(pb, 12);
ff_get_guid(pb, &formattype);
size = avio_rl32(pb);
if (size < 0 || size > INT_MAX - 92 - consumed)
return AVERROR_INVALIDDATA;
parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
consumed += 92 + size;
}
} else if (!ff_guidcmp(g, ff_stream2_guid)) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
ff_asf_guid mediatype, subtype, formattype;
int size;
avio_skip(pb, 12);
ff_get_guid(pb, &mediatype);
ff_get_guid(pb, &subtype);
avio_skip(pb, 12);
ff_get_guid(pb, &formattype);
size = avio_rl32(pb);
if (size < 0 || size > INT_MAX - 76 - consumed)
return AVERROR_INVALIDDATA;
parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
consumed += 76 + size;
}
} else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
!ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
!ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
!ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
!ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0) {
AVStream *st = s->streams[stream_index];
uint8_t buf[258];
const uint8_t *pbuf = buf;
int buf_size;
avio_skip(pb, 8);
consumed += 8;
if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
!ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
avio_skip(pb, 6);
consumed += 6;
}
buf_size = FFMIN(len - consumed, sizeof(buf));
if (avio_read(pb, buf, buf_size) != buf_size)
return AVERROR_INVALIDDATA;
consumed += buf_size;
ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
}
} else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0) {
AVStream *st = s->streams[stream_index];
int audio_type;
avio_skip(pb, 8);
audio_type = avio_r8(pb);
if (audio_type == 2)
st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
else if (audio_type == 3)
st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
consumed += 9;
}
} else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0) {
avio_skip(pb, 12);
if (avio_rl32(pb))
av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
consumed += 16;
}
} else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0) {
AVStream *st = s->streams[stream_index];
uint8_t language[4];
avio_skip(pb, 12);
avio_read(pb, language, 3);
if (language[0]) {
language[3] = 0;
av_dict_set(&st->metadata, "language", language, 0);
if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
}
consumed += 15;
}
} else if (!ff_guidcmp(g, ff_timestamp_guid)) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0) {
avio_skip(pb, 8);
wtv->pts = avio_rl64(pb);
consumed += 16;
if (wtv->pts == -1)
wtv->pts = AV_NOPTS_VALUE;
else {
wtv->last_valid_pts = wtv->pts;
if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
wtv->epoch = wtv->pts;
if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
avio_skip(pb, WTV_PAD8(len) - consumed);
return 0;
}
}
}
} else if (!ff_guidcmp(g, ff_data_guid)) {
int stream_index = ff_find_stream_index(s, sid);
if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
WtvStream *wst = s->streams[stream_index]->priv_data;
wst->seen_data = 1;
if (len_ptr) {
*len_ptr = len;
}
return stream_index;
}
} else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0)
av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
} else if (
!ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) ||
!ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) ||
!ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) ||
!ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
!ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) ||
!ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) ||
!ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) ||
!ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) ||
!ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) ||
!ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) ||
!ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) ||
!ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
!ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
!ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
!ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
!ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
!ff_guidcmp(g, ff_index_guid) ||
!ff_guidcmp(g, ff_sync_guid) ||
!ff_guidcmp(g, ff_stream1_guid) ||
!ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
//ignore known guids
} else
av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
if (avio_feof(pb))
break;
avio_skip(pb, WTV_PAD8(len) - consumed);
}
return AVERROR_EOF;
}
static int read_header(AVFormatContext *s)
{
WtvContext *wtv = s->priv_data;
unsigned root_sector;
int root_size;
uint8_t root[WTV_SECTOR_SIZE];
AVIOContext *pb;
int64_t timeline_pos;
int64_t ret;
wtv->epoch =
wtv->pts =
wtv->last_valid_pts = AV_NOPTS_VALUE;
/* read root directory sector */
avio_skip(s->pb, 0x30);
root_size = avio_rl32(s->pb);
if (root_size > sizeof(root)) {
av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
return AVERROR_INVALIDDATA;
}
avio_skip(s->pb, 4);
root_sector = avio_rl32(s->pb);
ret = seek_by_sector(s->pb, root_sector, 0);
if (ret < 0)
return ret;
root_size = avio_read(s->pb, root, root_size);
if (root_size < 0)
return AVERROR_INVALIDDATA;
/* parse chunks up until first data chunk */
wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
if (!wtv->pb) {
av_log(s, AV_LOG_ERROR, "timeline data missing\n");
return AVERROR_INVALIDDATA;
}
ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
if (ret < 0) {
wtvfile_close(wtv->pb);
return ret;
}
avio_seek(wtv->pb, -32, SEEK_CUR);
timeline_pos = avio_tell(s->pb); // save before opening another file
/* read metadata */
pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
if (pb) {
parse_legacy_attrib(s, pb);
wtvfile_close(pb);
}
s->ctx_flags |= AVFMTCTX_NOHEADER; // Needed for noStreams.wtv
/* read seek index */
if (s->nb_streams) {
AVStream *st = s->streams[0];
pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
if (pb) {
while(1) {
uint64_t timestamp = avio_rl64(pb);
uint64_t frame_nb = avio_rl64(pb);
if (avio_feof(pb))
break;
ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
}
wtvfile_close(pb);
if (wtv->nb_index_entries) {
pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
if (pb) {
AVIndexEntry *e = wtv->index_entries;
AVIndexEntry *e_end = wtv->index_entries + wtv->nb_index_entries - 1;
uint64_t last_position = 0;
while (1) {
uint64_t frame_nb = avio_rl64(pb);
uint64_t position = avio_rl64(pb);
while (e <= e_end && frame_nb > e->size) {
e->pos = last_position;
e++;
}
if (avio_feof(pb))
break;
last_position = position;
}
e_end->pos = last_position;
wtvfile_close(pb);
st->duration = e_end->timestamp;
}
}
}
}
avio_seek(s->pb, timeline_pos, SEEK_SET);
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
WtvContext *wtv = s->priv_data;
AVIOContext *pb = wtv->pb;
int stream_index, len, ret;
stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
if (stream_index < 0)
return stream_index;
ret = av_get_packet(pb, pkt, len - 32);
if (ret < 0)
return ret;
pkt->stream_index = stream_index;
pkt->pts = wtv->pts;
avio_skip(pb, WTV_PAD8(len) - len);
return 0;
}
static int read_seek(AVFormatContext *s, int stream_index,
int64_t ts, int flags)
{
WtvContext *wtv = s->priv_data;
AVIOContext *pb = wtv->pb;
AVStream *st = s->streams[0];
int64_t ts_relative;
int i;
if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
return AVERROR(ENOSYS);
/* timestamp adjustment is required because wtv->pts values are absolute,
* whereas AVIndexEntry->timestamp values are relative to epoch. */
ts_relative = ts;
if (wtv->epoch != AV_NOPTS_VALUE)
ts_relative -= wtv->epoch;
i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
if (i < 0) {
if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
if (avio_seek(pb, 0, SEEK_SET) < 0)
return -1;
} else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
return -1;
}
if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
return AVERROR(ERANGE);
return 0;
}
if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
return -1;
wtv->pts = wtv->index_entries[i].timestamp;
if (wtv->epoch != AV_NOPTS_VALUE)
wtv->pts += wtv->epoch;
wtv->last_valid_pts = wtv->pts;
return 0;
}
static int read_close(AVFormatContext *s)
{
WtvContext *wtv = s->priv_data;
av_freep(&wtv->index_entries);
wtvfile_close(wtv->pb);
return 0;
}
const FFInputFormat ff_wtv_demuxer = {
.p.name = "wtv",
.p.long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
.p.flags = AVFMT_SHOW_IDS,
.priv_data_size = sizeof(WtvContext),
.read_probe = read_probe,
.read_header = read_header,
.read_packet = read_packet,
.read_seek = read_seek,
.read_close = read_close,
};
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