[FFmpeg-cvslog] wtv: filesystem implementation
Peter Ross
git
Sun Feb 6 21:08:52 CET 2011
ffmpeg | branch: master | Peter Ross <pross at xvid.org> | Sun Jan 23 12:58:59 2011 +1100| [d3c0de863d2330feda811f32c94b9718b9388f91] | committer: Michael Niedermayer
wtv: filesystem implementation
Signed-off-by: Ronald S. Bultje <rsbultje at gmail.com>
(cherry picked from commit f61dee2fe4bc6a614079f37c25af1f92e90bc35b)
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d3c0de863d2330feda811f32c94b9718b9388f91
---
libavformat/wtv.c | 642 ++++++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 564 insertions(+), 78 deletions(-)
diff --git a/libavformat/wtv.c b/libavformat/wtv.c
index 816c406..3d18257 100644
--- a/libavformat/wtv.c
+++ b/libavformat/wtv.c
@@ -1,6 +1,6 @@
/*
* Windows Television (WTV) demuxer
- * Copyright (c) 2010 Peter Ross <pross at xvid.org>
+ * Copyright (c) 2010-2011 Peter Ross <pross at xvid.org>
*
* This file is part of FFmpeg.
*
@@ -26,6 +26,7 @@
*/
#include "libavutil/intreadwrite.h"
+#include "libavutil/intfloat_readwrite.h"
#include "avformat.h"
#include "riff.h"
#include "asf.h"
@@ -37,22 +38,294 @@
#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 {
- int seen_data;
-} WtvStream;
+ ByteIOContext *pb_filesystem; /** file system (AVFormatContext->pb) */
-typedef struct WtvContext {
- uint64_t pts;
-} WtvContext;
+ 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;
+ ByteIOContext *pb = wf->pb_filesystem;
+ int nread = 0;
+
+ if (wf->error || url_ferror(pb))
+ return -1;
+ if (wf->position >= wf->length || url_feof(pb))
+ 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 = get_buffer(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)) &&
+ url_fseek(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;
+ ByteIOContext *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 ||
+ url_fseek(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(ByteIOContext *pb, uint32_t *data, int count)
+{
+ int i, total = 0;
+ for (i = 0; i < count; i++) {
+ if ((data[total] = get_le32(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 ByteIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
+{
+ ByteIOContext *pb;
+ WtvFile *wf;
+ uint8_t *buffer;
+
+ if (url_fseek(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 (url_fseek(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 (url_fseek(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;
+ }
-static int is_zero(uint8_t *v, int n)
+ pb = av_alloc_put_byte(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 ByteIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
{
- int i;
- for (i = 0; i < n; i++)
- if (v[i]) return 0;
- return 1;
+ 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(ByteIOContext *pb)
+{
+ WtvFile *wf = pb->opaque;
+ av_free(wf->sectors);
+ av_free(pb);
+}
+
+/*
+ *
+ * Main demuxer
+ *
+ */
+
+typedef struct {
+ int seen_data;
+} WtvStream;
+
+typedef struct {
+ ByteIOContext *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;
@@ -71,7 +344,7 @@ static enum CodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid g
/* 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 meta_guid =
+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};
@@ -159,12 +432,151 @@ static int read_probe(AVProbeData *p)
}
/**
+ * 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;
+ strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
+}
+
+/**
+ * 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;
+ strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
+}
+
+/**
+ * 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_int2dbl(value);
+ strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t));
+}
+
+static void get_attachment(AVFormatContext *s, ByteIOContext *pb, int length)
+{
+ char mime[1024];
+ char description[1024];
+ unsigned int filesize;
+ AVStream *st;
+ int64_t pos = url_ftell(pb);
+
+ avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
+ if (strcmp(mime, "image/jpeg"))
+ goto done;
+
+ get_byte(pb);
+ avio_get_str16le(pb, INT_MAX, description, sizeof(description));
+ filesize = get_le32(pb);
+ if (!filesize)
+ goto done;
+
+ st = av_new_stream(s, 0);
+ if (!st)
+ goto done;
+ av_metadata_set2(&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;
+ get_buffer(pb, st->codec->extradata, filesize);
+done:
+ url_fseek(pb, pos + length, SEEK_SET);
+}
+
+static void get_tag(AVFormatContext *s, ByteIOContext *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, get_le32(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, get_le32(pb) ? "true" : "false");
+ } else if (type == 4 && length == 8) {
+ int64_t num = get_le64(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_int2dbl(num));
+ else
+ snprintf(buf, buf_size, "%"PRIi64, num);
+ } else if (type == 5 && length == 2) {
+ snprintf(buf, buf_size, "%"PRIi16, get_le16(pb));
+ } else if (type == 6 && length == 16) {
+ ff_asf_guid guid;
+ get_buffer(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);
+ url_fskip(pb, length);
+ return;
+ }
+
+ av_metadata_set2(&s->metadata, key, buf, 0);
+ av_freep(&buf);
+}
+
+/**
+ * Parse metadata entries
+ */
+static void parse_legacy_attrib(AVFormatContext *s, ByteIOContext *pb)
+{
+ ff_asf_guid guid;
+ int length, type;
+ while(!url_feof(pb)) {
+ char key[1024];
+ ff_get_guid(pb, &guid);
+ type = get_le32(pb);
+ length = get_le32(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)
{
- ByteIOContext *pb = s->pb;
+ WtvContext *wtv = s->priv_data;
+ ByteIOContext *pb = wtv->pb;
url_fskip(pb, 72); // picture aspect ratio is unreliable
ff_get_bmp_header(pb, st);
@@ -233,7 +645,8 @@ 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)
{
- ByteIOContext *pb = s->pb;
+ WtvContext *wtv = s->priv_data;
+ ByteIOContext *pb = wtv->pb;
if (!ff_guidcmp(subtype, mediasubtype_cpfilters_processed) &&
!ff_guidcmp(formattype, format_cpfilters_processed)) {
ff_asf_guid actual_subtype;
@@ -339,32 +752,25 @@ static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
enum {
SEEK_TO_DATA = 0,
- SEEK_TO_BYTE,
SEEK_TO_PTS,
};
/**
* Parse WTV chunks
- * @param mode SEEK_TO_DATA, SEEK_TO_BYTE, SEEK_TO_PTS
- * @param seekts either byte position or timestamp
+ * @param mode SEEK_TO_DATA or SEEK_TO_PTS
+ * @param seekts timestamp
* @param[out] len 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;
- ByteIOContext *pb = s->pb;
+ ByteIOContext *pb = wtv->pb;
while (!url_feof(pb)) {
ff_asf_guid g;
int len, sid, consumed;
- if (mode == SEEK_TO_BYTE && url_ftell(pb) >= seekts)
- return 0;
-
ff_get_guid(pb, &g);
- if (is_zero(g, sizeof(ff_asf_guid)))
- return AVERROR_EOF;
-
len = get_le32(pb);
if (len < 32)
break;
@@ -458,11 +864,16 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
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)
url_fskip(pb, WTV_PAD8(len) - consumed);
return 0;
}
+ }
}
} else if (!ff_guidcmp(g, data_guid)) {
int stream_index = ff_find_stream_index(s, sid);
@@ -472,8 +883,6 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
if (len_ptr) {
*len_ptr = len;
}
- if (wtv->pts != AV_NOPTS_VALUE)
- av_add_index_entry(s->streams[stream_index], url_ftell(pb) - consumed, wtv->pts, 0, 0, AVINDEX_KEYFRAME);
return stream_index;
}
} else if (
@@ -505,26 +914,114 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
return AVERROR_EOF;
}
-#define WTV_CHUNK_START 0x40000
+/* 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, AVFormatParameters *ap)
{
- ByteIOContext *pb = s->pb;
+ WtvContext *wtv = s->priv_data;
+ int root_sector, root_size;
+ uint8_t root[WTV_SECTOR_SIZE];
+ ByteIOContext *pb;
+ int64_t timeline_pos;
int ret;
- url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
+ wtv->epoch =
+ wtv->pts =
+ wtv->last_valid_pts = AV_NOPTS_VALUE;
+
+ /* read root directory sector */
+ url_fskip(s->pb, 0x30);
+ root_size = get_le32(s->pb);
+ if (root_size > sizeof(root)) {
+ av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
+ return AVERROR_INVALIDDATA;
+ }
+ url_fskip(s->pb, 4);
+ root_sector = get_le32(s->pb);
+
+ url_fseek(s->pb, root_sector << WTV_SECTOR_BITS, SEEK_SET);
+ root_size = get_buffer(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;
+ url_fseek(wtv->pb, -32, SEEK_CUR);
+
+ timeline_pos = url_ftell(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 = get_le64(pb);
+ uint64_t frame_nb = get_le64(pb);
+ if (url_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);
- url_fseek(pb, -32, SEEK_CUR);
+ 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 = get_le64(pb);
+ uint64_t position = get_le64(pb);
+ if (url_feof(pb))
+ 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;
+ }
+ }
+ }
+ }
+
+ url_fseek(s->pb, timeline_pos, SEEK_SET);
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
WtvContext *wtv = s->priv_data;
- ByteIOContext *pb = s->pb;
+ ByteIOContext *pb = wtv->pb;
int stream_index, len, ret;
stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
@@ -540,59 +1037,47 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
return 0;
}
-static int read_seek2(AVFormatContext *s, int stream_index,
- int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+static int read_seek(AVFormatContext *s, int stream_index,
+ int64_t ts, int flags)
{
WtvContext *wtv = s->priv_data;
- ByteIOContext *pb = s->pb;
- AVStream *st;
+ ByteIOContext *pb = wtv->pb;
+ AVStream *st = s->streams[0];
+ int64_t ts_relative;
int i;
- if (stream_index < 0) {
- stream_index = av_find_default_stream_index(s);
- if (stream_index < 0)
- return -1;
- }
- st = s->streams[stream_index];
-
- if ((flags & AVSEEK_FLAG_FRAME)) {
+ if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
return AVERROR_NOTSUPP;
- } else if ((flags & AVSEEK_FLAG_BYTE)) {
- if (ts < url_ftell(pb)) {
- for (i = st->nb_index_entries - 1; i >= 0; i--) {
- if (st->index_entries[i].pos <= ts) {
- wtv->pts = st->index_entries[i].timestamp;
- url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
- break;
- }
- }
- if (i < 0) {
- wtv->pts = 0;
- url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
- }
- }
- if (parse_chunks(s, SEEK_TO_BYTE, ts, 0) < 0)
+
+ /* 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)
+ url_fseek(pb, 0, SEEK_SET);
+ else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries)
+ url_fseek(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;
- } else {
- ts *= 10;
- i = av_index_search_timestamp(st, ts, flags);
- if (i < 0) {
- if (st->nb_index_entries > 0) {
- wtv->pts = st->index_entries[st->nb_index_entries - 1].timestamp;
- url_fseek(pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET);
- } else {
- wtv->pts = 0;
- url_fseek(pb, WTV_CHUNK_START, SEEK_SET);
- }
- if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
- return AVERROR(ERANGE);
- return 0;
- }
- wtv->pts = st->index_entries[i].timestamp;
- url_fseek(pb, st->index_entries[i].pos, SEEK_SET);
- 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;
+ url_fseek(pb, wtv->index_entries[i].pos, SEEK_SET);
+ return 0;
+}
+
+static int read_close(AVFormatContext *s)
+{
+ WtvContext *wtv = s->priv_data;
+ wtvfile_close(wtv->pb);
+ return 0;
}
AVInputFormat ff_wtv_demuxer = {
@@ -602,6 +1087,7 @@ AVInputFormat ff_wtv_demuxer = {
.read_probe = read_probe,
.read_header = read_header,
.read_packet = read_packet,
- .read_seek2 = read_seek2,
- .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
+ .read_seek = read_seek,
+ .read_close = read_close,
+ .flags = AVFMT_SHOW_IDS,
};
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