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FFmpeg/libavformat/wtv.c
Martin Storsjö dc53858063 wtv: Check the return value from gmtime 
On MSVC, gmtime returns NULL for values outside of their supported
range (and these show up in our fate test). This doesn't seem
to affect the actual fate test result.

Signed-off-by: Martin Storsjö <martin@martin.st>
2012-06-25 16:20:08 +03:00

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/*
* Windows Television (WTV) demuxer
* Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
*
* 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
*/
/**
* @file
* Windows Television (WTV) demuxer
* @author Peter Ross <pross@xvid.org>
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "riff.h"
#include "asf.h"
#include "mpegts.h"
/* Macros for formating GUIDs */
#define PRI_GUID \
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"
#define ARG_GUID(g) \
g[0],g[1],g[2],g[3],g[4],g[5],g[6],g[7],g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
#define PRI_PRETTY_GUID \
"%08x-%04x-%04x-%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 34
/*
*
* File system routines
*
*/
#define WTV_SECTOR_BITS 12
#define WTV_SECTOR_SIZE (1 << WTV_SECTOR_BITS)
#define WTV_BIGSECTOR_BITS 18
typedef struct {
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;
/**
* @return bytes read, 0 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;
if (wf->error || pb->error)
return -1;
if (wf->position >= wf->length || pb->eof_reached)
return 0;
buf_size = FFMIN(buf_size, wf->length - wf->position);
while(nread < buf_size) {
int n;
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)) &&
avio_seek(pb, (int64_t)wf->sectors[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)) {
wf->error = 1;
break;
}
}
}
return nread;
}
/**
* @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 ||
avio_seek(pb, ((int64_t)wf->sectors[offset >> wf->sector_bits] << WTV_SECTOR_BITS)
+ (offset & ((1 << wf->sector_bits) - 1)), SEEK_SET) < 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(int first_sector, uint64_t length, int depth, AVFormatContext *s)
{
AVIOContext *pb;
WtvFile *wf;
uint8_t *buffer;
if (avio_seek(s->pb, first_sector << WTV_SECTOR_BITS, SEEK_SET) < 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;
wf->sector_bits = WTV_SECTOR_BITS;
} 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);
wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
} 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_malloc(nb_sectors1 << WTV_SECTOR_BITS);
if (!wf->sectors) {
av_free(wf);
return NULL;
}
wf->nb_sectors = 0;
for (i = 0; i < nb_sectors1; i++) {
if (avio_seek(s->pb, (int64_t)sectors1[i] << WTV_SECTOR_BITS, SEEK_SET) < 0)
break;
wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
}
wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
} else {
av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
av_free(wf);
return NULL;
}
if (!wf->nb_sectors) {
av_free(wf->sectors);
av_free(wf);
return NULL;
}
/* 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 intial sector */
wf->position = 0;
if (avio_seek(s->pb, (int64_t)wf->sectors[0] << WTV_SECTOR_BITS, SEEK_SET) < 0) {
av_free(wf->sectors);
av_free(wf);
return NULL;
}
wf->pb_filesystem = s->pb;
buffer = av_malloc(1 << wf->sector_bits);
if (!buffer) {
av_free(wf->sectors);
av_free(wf);
return NULL;
}
pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
wtvfile_read_packet, NULL, wtvfile_seek);
if (!pb) {
av_free(buffer);
av_free(wf->sectors);
av_free(wf);
}
return pb;
}
static const ff_asf_guid dir_entry_guid =
{0x92,0xB7,0x74,0x91,0x59,0x70,0x70,0x44,0x88,0xDF,0x06,0x3B,0x82,0xCC,0x21,0x3D};
/**
* 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, dir_entry_guid)) {
av_log(s, AV_LOG_ERROR, "unknown guid "PRI_GUID", expected dir_entry_guid; "
"remaining directory entries ignored\n", ARG_GUID(buf));
break;
}
dir_length = AV_RL16(buf + 16);
file_length = AV_RL64(buf + 24);
name_size = 2 * AV_RL32(buf + 32);
if (buf + 48 + name_size > buf_end) {
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 0;
}
#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_free(wf->sectors);
av_free(wf);
av_free(pb->buffer);
av_free(pb);
}
/*
*
* Main demuxer
*
*/
typedef struct {
int seen_data;
} WtvStream;
typedef struct {
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 interative 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;
typedef struct {
enum CodecID id;
ff_asf_guid guid;
} AVCodecGuid;
static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
{
int i;
for (i = 0; guids[i].id != CODEC_ID_NONE; i++) {
if (!ff_guidcmp(guids[i].guid, guid))
return guids[i].id;
}
return CODEC_ID_NONE;
}
/* WTV GUIDs */
static const ff_asf_guid wtv_guid =
{0xB7,0xD8,0x00,0x20,0x37,0x49,0xDA,0x11,0xA6,0x4E,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
static const ff_asf_guid metadata_guid =
{0x5A,0xFE,0xD7,0x6D,0xC8,0x1D,0x8F,0x4A,0x99,0x22,0xFA,0xB1,0x1C,0x38,0x14,0x53};
static const ff_asf_guid timestamp_guid =
{0x5B,0x05,0xE6,0x1B,0x97,0xA9,0x49,0x43,0x88,0x17,0x1A,0x65,0x5A,0x29,0x8A,0x97};
static const ff_asf_guid data_guid =
{0x95,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
static const ff_asf_guid stream_guid =
{0xED,0xA4,0x13,0x23,0x2D,0xBF,0x4F,0x45,0xAD,0x8A,0xD9,0x5B,0xA7,0xF9,0x1F,0xEE};
static const ff_asf_guid stream2_guid =
{0xA2,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D};
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 */
#define MEDIASUBTYPE_BASE_GUID \
0x00,0x00,0x10,0x00,0x80,0x00,0x00,0xAA,0x00,0x38,0x9B,0x71
/* Media types */
static const ff_asf_guid mediatype_audio =
{'a','u','d','s',MEDIASUBTYPE_BASE_GUID};
static const ff_asf_guid mediatype_video =
{'v','i','d','s',MEDIASUBTYPE_BASE_GUID};
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_cpfilters_processed =
{0x28,0xBD,0xAD,0x46,0xD0,0x6F,0x96,0x47,0x93,0xB2,0x15,0x5C,0x51,0xDC,0x04,0x8D};
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};
/* Formats */
static const ff_asf_guid format_cpfilters_processed =
{0x6F,0xB3,0x39,0x67,0x5F,0x1D,0xC2,0x4A,0x81,0x92,0x28,0xBB,0x0E,0x73,0xD1,0x6A};
static const ff_asf_guid format_waveformatex =
{0x81,0x9F,0x58,0x05,0x56,0xC3,0xCE,0x11,0xBF,0x01,0x00,0xAA,0x00,0x55,0x59,0x5A};
static const ff_asf_guid format_videoinfo2 =
{0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
static const ff_asf_guid format_mpeg2_video =
{0xE3,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
static const ff_asf_guid format_none =
{0xD6,0x17,0x64,0x0F,0x18,0xC3,0xD0,0x11,0xA4,0x3F,0x00,0xA0,0xC9,0x22,0x31,0x96};
static const AVCodecGuid video_guids[] = {
{CODEC_ID_MPEG2VIDEO, {0x26,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
{CODEC_ID_NONE}
};
static const AVCodecGuid audio_guids[] = {
{CODEC_ID_AC3, {0x2C,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
{CODEC_ID_EAC3, {0xAF,0x87,0xFB,0xA7,0x02,0x2D,0xFB,0x42,0xA4,0xD4,0x05,0xCD,0x93,0x84,0x3B,0xDD}},
{CODEC_ID_MP2, {0x2B,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA}},
{CODEC_ID_NONE}
};
static int read_probe(AVProbeData *p)
{
return ff_guidcmp(p->buf, wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
}
/**
* Convert win32 FILETIME to ISO-8601 string
*/
static void filetime_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = (value / 10000000LL) - 11644473600LL;
struct tm *tm = gmtime(&t);
if (tm)
strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
else
buf[0] = '\0';
}
/**
* Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
*/
static void crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = (value / 10000000LL) - 719162LL*86400LL;
struct tm *tm = gmtime(&t);
if (tm)
strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
else
buf[0] = '\0';
}
/**
* Convert OLE DATE to ISO-8601 string
*/
static void oledate_to_iso8601(char *buf, int buf_size, int64_t value)
{
time_t t = 631112400LL + 86400*av_int2double(value);
struct tm *tm = gmtime(&t);
if (tm)
strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
else
buf[0] = '\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;
st = avformat_new_stream(s, NULL);
if (!st)
goto done;
av_dict_set(&st->metadata, "title", description, 0);
st->codec->codec_id = CODEC_ID_MJPEG;
st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
st->codec->extradata = av_mallocz(filesize);
if (!st->codec->extradata)
goto done;
st->codec->extradata_size = filesize;
avio_read(pb, st->codec->extradata, filesize);
done:
avio_seek(pb, pos + length, SEEK_SET);
}
static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
{
int buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
char *buf = av_malloc(buf_size);
if (!buf)
return;
if (type == 0 && length == 4) {
snprintf(buf, buf_size, "%"PRIi32, avio_rl32(pb));
} else if (type == 1) {
avio_get_str16le(pb, length, buf, buf_size);
if (!strlen(buf)) {
av_free(buf);
return;
}
} 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"))
filetime_to_iso8601(buf, buf_size, num);
else if (!strcmp(key, "WM/WMRVEncodeTime") ||
!strcmp(key, "WM/WMRVEndTime"))
crazytime_to_iso8601(buf, buf_size, num);
else if (!strcmp(key, "WM/WMRVExpirationDate"))
oledate_to_iso8601(buf, buf_size, num);
else if (!strcmp(key, "WM/WMRVBitrate"))
snprintf(buf, buf_size, "%f", av_int2double(num));
else
snprintf(buf, buf_size, "%"PRIi64, num);
} else if (type == 5 && length == 2) {
snprintf(buf, buf_size, "%"PRIi16, avio_rl16(pb));
} else if (type == 6 && length == 16) {
ff_asf_guid guid;
avio_read(pb, guid, 16);
snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
} else if (type == 2 && !strcmp(key, "WM/Picture")) {
get_attachment(s, pb, length);
av_freep(&buf);
return;
} else {
av_freep(&buf);
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, buf, 0);
av_freep(&buf);
}
/**
* Parse metadata entries
*/
static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
{
ff_asf_guid guid;
int length, type;
while(!pb->eof_reached) {
char key[1024];
ff_get_guid(pb, &guid);
type = avio_rl32(pb);
length = avio_rl32(pb);
if (!length)
break;
if (ff_guidcmp(&guid, metadata_guid)) {
av_log(s, AV_LOG_WARNING, "unknown guid "PRI_GUID", expected metadata_guid; "
"remaining metadata entries ignored\n", 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
ff_get_bmp_header(pb, st);
return 72 + 40;
}
/**
* Parse MPEG1WAVEFORMATEX extradata structure
*/
static void parse_mpeg1waveformatex(AVStream *st)
{
/* fwHeadLayer */
switch (AV_RL16(st->codec->extradata)) {
case 0x0001 : st->codec->codec_id = CODEC_ID_MP1; break;
case 0x0002 : st->codec->codec_id = CODEC_ID_MP2; break;
case 0x0004 : st->codec->codec_id = CODEC_ID_MP3; break;
}
st->codec->bit_rate = AV_RL32(st->codec->extradata + 2); /* dwHeadBitrate */
/* dwHeadMode */
switch (AV_RL16(st->codec->extradata + 6)) {
case 1 : case 2 : case 4 : st->codec->channels = 2; break;
case 8 : st->codec->channels = 1; 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->codec->extradata) {
av_freep(&st->codec->extradata);
st->codec->extradata_size = 0;
}
} else {
WtvStream *wst = av_mallocz(sizeof(WtvStream));
if (!wst)
return NULL;
st = avformat_new_stream(s, NULL);
if (!st)
return NULL;
st->id = sid;
st->priv_data = wst;
}
st->codec->codec_type = codec_type;
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, int size)
{
WtvContext *wtv = s->priv_data;
AVIOContext *pb = wtv->pb;
if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
!ff_guidcmp(formattype, 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);
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, mediatype_audio)) {
st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
if (!st)
return NULL;
if (!ff_guidcmp(formattype, format_waveformatex)) {
int ret = ff_get_wav_header(pb, st->codec, size);
if (ret < 0)
return NULL;
} else {
if (ff_guidcmp(formattype, format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
avio_skip(pb, size);
}
if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
st->codec->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codec->bits_per_coded_sample);
} else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
if (st->codec->extradata && st->codec->extradata_size >= 22)
parse_mpeg1waveformatex(st);
else
av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
} else {
st->codec->codec_id = ff_codec_guid_get_id(audio_guids, subtype);
if (st->codec->codec_id == CODEC_ID_NONE)
av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", ARG_GUID(subtype));
}
return st;
} else if (!ff_guidcmp(mediatype, mediatype_video)) {
st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
if (!st)
return NULL;
if (!ff_guidcmp(formattype, format_videoinfo2)) {
int consumed = parse_videoinfoheader2(s, st);
avio_skip(pb, FFMAX(size - consumed, 0));
} else if (!ff_guidcmp(formattype, format_mpeg2_video)) {
int consumed = parse_videoinfoheader2(s, st);
avio_skip(pb, FFMAX(size - consumed, 0));
} else {
if (ff_guidcmp(formattype, format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
avio_skip(pb, size);
}
if (!memcmp(subtype + 4, (const uint8_t[]){MEDIASUBTYPE_BASE_GUID}, 12)) {
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
} else {
st->codec->codec_id = ff_codec_guid_get_id(video_guids, subtype);
}
if (st->codec->codec_id == CODEC_ID_NONE)
av_log(s, AV_LOG_WARNING, "unknown subtype:"PRI_GUID"\n", 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, format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
avio_skip(pb, size);
st->codec->codec_id = 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, format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
avio_skip(pb, size);
st->codec->codec_id = CODEC_ID_DVB_TELETEXT;
return st;
} else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
!ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
if (ff_guidcmp(formattype, format_none))
av_log(s, AV_LOG_WARNING, "unknown formattype:"PRI_GUID"\n", ARG_GUID(formattype));
avio_skip(pb, size);
return NULL;
}
av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"PRI_GUID
", subtype:"PRI_GUID", formattype:"PRI_GUID"\n",
ARG_GUID(mediatype), ARG_GUID(subtype), ARG_GUID(formattype));
avio_skip(pb, size);
return NULL;
}
enum {
SEEK_TO_DATA = 0,
SEEK_TO_PTS,
};
/**
* 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 (!pb->eof_reached) {
ff_asf_guid g;
int len, sid, consumed;
ff_get_guid(pb, &g);
len = avio_rl32(pb);
if (len < 32)
break;
sid = avio_rl32(pb) & 0x7FFF;
avio_skip(pb, 8);
consumed = 32;
if (!ff_guidcmp(g, stream_guid)) {
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);
parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
consumed += 92 + size;
}
} else if (!ff_guidcmp(g, stream2_guid)) {
int stream_index = ff_find_stream_index(s, sid);
if (stream_index >= 0 && !((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);
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));
avio_read(pb, buf, buf_size);
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, 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) {
#define WTV_PAD8(x) (((x) + 7) & ~7)
avio_skip(pb, WTV_PAD8(len) - consumed);
return 0;
}
}
}
} else if (!ff_guidcmp(g, data_guid)) {
int stream_index = ff_find_stream_index(s, sid);
if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32) {
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_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_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 */ (const ff_asf_guid){0x12,0xF6,0x22,0xB6,0xAD,0x47,0x71,0x46,0xAD,0x6C,0x05,0xA9,0x8E,0x65,0xDE,0x3A}) ||
!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, (const ff_asf_guid){0x96,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
!ff_guidcmp(g, (const ff_asf_guid){0x97,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
!ff_guidcmp(g, (const ff_asf_guid){0xA1,0xC3,0xD2,0xC2,0x7E,0x9A,0xDA,0x11,0x8B,0xF7,0x00,0x07,0xE9,0x5E,0xAD,0x8D})) {
//ignore known guids
} else
av_log(s, AV_LOG_WARNING, "unsupported chunk:"PRI_GUID"\n", ARG_GUID(g));
avio_skip(pb, WTV_PAD8(len) - consumed);
}
return AVERROR_EOF;
}
/* declare utf16le strings */
#define _ , 0,
static const uint8_t timeline_le16[] =
{'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e', 0};
static const uint8_t table_0_entries_legacy_attrib_le16[] =
{'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'l'_'e'_'g'_'a'_'c'_'y'_'_'_'a'_'t'_'t'_'r'_'i'_'b', 0};
static const uint8_t table_0_entries_time_le16[] =
{'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'t'_'i'_'m'_'e', 0};
static const uint8_t timeline_table_0_entries_Events_le16[] =
{'t'_'i'_'m'_'e'_'l'_'i'_'n'_'e'_'.'_'t'_'a'_'b'_'l'_'e'_'.'_'0'_'.'_'e'_'n'_'t'_'r'_'i'_'e'_'s'_'.'_'E'_'v'_'e'_'n'_'t'_'s', 0};
#undef _
static int read_header(AVFormatContext *s)
{
WtvContext *wtv = s->priv_data;
int root_sector, root_size;
uint8_t root[WTV_SECTOR_SIZE];
AVIOContext *pb;
int64_t timeline_pos;
int 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);
avio_seek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
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, 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)
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, table_0_entries_legacy_attrib_le16);
if (pb) {
parse_legacy_attrib(s, pb);
wtvfile_close(pb);
}
/* read seek index */
if (s->nb_streams) {
AVStream *st = s->streams[0];
pb = wtvfile_open(s, root, root_size, table_0_entries_time_le16);
if (pb) {
while(1) {
uint64_t timestamp = avio_rl64(pb);
uint64_t frame_nb = avio_rl64(pb);
if (pb->eof_reached)
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, timeline_table_0_entries_Events_le16);
if (pb) {
int i;
while (1) {
uint64_t frame_nb = avio_rl64(pb);
uint64_t position = avio_rl64(pb);
if (pb->eof_reached)
break;
for (i = wtv->nb_index_entries - 1; i >= 0; i--) {
AVIndexEntry *e = wtv->index_entries + i;
if (frame_nb > e->size)
break;
if (position > e->pos)
e->pos = position;
}
}
wtvfile_close(pb);
st->duration = wtv->index_entries[wtv->nb_index_entries - 1].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)
avio_seek(pb, 0, SEEK_SET);
else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET);
if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
return AVERROR(ERANGE);
return 0;
}
wtv->pts = wtv->index_entries[i].timestamp;
if (wtv->epoch != AV_NOPTS_VALUE)
wtv->pts += wtv->epoch;
wtv->last_valid_pts = wtv->pts;
avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
return 0;
}
static int read_close(AVFormatContext *s)
{
WtvContext *wtv = s->priv_data;
av_free(wtv->index_entries);
wtvfile_close(wtv->pb);
return 0;
}
AVInputFormat ff_wtv_demuxer = {
.name = "wtv",
.long_name = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
.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,
.flags = AVFMT_SHOW_IDS,
};
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