diff options
Diffstat (limited to 'libavformat/wtvdec.c')
| -rw-r--r-- | libavformat/wtvdec.c | 1084 |
1 files changed, 1084 insertions, 0 deletions
diff --git a/libavformat/wtvdec.c b/libavformat/wtvdec.c new file mode 100644 index 0000000000..6427dd1049 --- /dev/null +++ b/libavformat/wtvdec.c @@ -0,0 +1,1084 @@ +/* + * 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 "libavutil/channel_layout.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/intfloat.h" +#include "avformat.h" +#include "internal.h" +#include "wtv.h" +#include "mpegts.h" + +/* Macros for formating GUIDs */ +#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 + * + */ + +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 || 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 = 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, (int64_t)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; + } 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_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); + } + } 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_free(wf->sectors); + av_free(wf); + return NULL; + } + + if ((int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > avio_tell(s->pb)) + 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 (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; +} + +/** + * 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 (buf + 48 + (int64_t)name_size > buf_end || name_size<0) { + 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_freep(&pb->opaque); + av_freep(&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; + +/* 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}; + +/* Formats */ +static const ff_asf_guid format_videoinfo2 = + {0xA0,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA}; + +static int read_probe(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 *tm = gmtime(&t); + if (!tm) + return -1; + strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t)); + 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 *tm = gmtime(&t); + if (!tm) + return -1; + strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", gmtime(&t)); + 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 *result= gmtime(&t); + if (!result) + return -1; + strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", result); + return 0; +} + +static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length) +{ + char mime[1024]; + char description[1024]; + unsigned int filesize; + AVStream *st; + int ret; + 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_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = AV_CODEC_ID_MJPEG; + ret = av_get_packet(pb, &st->attached_pic, filesize); + if (ret < 0) + goto done; + st->attached_pic.stream_index = st->index; + st->attached_pic.flags |= AV_PKT_FLAG_KEY; + st->disposition |= AV_DISPOSITION_ATTACHED_PIC; +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; + char *buf; + + if (!strcmp(key, "WM/MediaThumbType")) { + avio_skip(pb, length); + return; + } + + buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1; + 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")) { + if (filetime_to_iso8601(buf, buf_size, num) < 0) { + av_free(buf); + return; + } + } else if (!strcmp(key, "WM/WMRVEncodeTime") || + !strcmp(key, "WM/WMRVEndTime")) { + if (crazytime_to_iso8601(buf, buf_size, num) < 0) { + av_free(buf); + return; + } + } else if (!strcmp(key, "WM/WMRVExpirationDate")) { + if (oledate_to_iso8601(buf, buf_size, num) < 0 ) { + av_free(buf); + return; + } + } 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(!url_feof(pb)) { + char key[1024]; + ff_get_guid(pb, &guid); + type = avio_rl32(pb); + length = avio_rl32(pb); + if (!length) + 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 + 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->codec->extradata)) { + case 0x0001 : st->codec->codec_id = AV_CODEC_ID_MP1; break; + case 0x0002 : st->codec->codec_id = AV_CODEC_ID_MP2; break; + case 0x0004 : st->codec->codec_id = AV_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; + st->codec->channel_layout = AV_CH_LAYOUT_STEREO; + break; + case 8 : st->codec->channels = 1; + st->codec->channel_layout = AV_CH_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->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) { + av_free(wst); + 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, 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); + 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(pb, st->codec, size); + 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->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(ff_codec_wav_guids, subtype); + if (st->codec->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, format_videoinfo2)) { + int consumed = parse_videoinfoheader2(s, st); + avio_skip(pb, FFMAX(size - consumed, 0)); + } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) { + int consumed = parse_videoinfoheader2(s, st); + 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->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype)); + } else { + st->codec->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype); + } + if (st->codec->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->codec->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->codec->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, +}; + +/** + * 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 (!url_feof(pb)) { + 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, 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); + 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); + 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, 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)); + + avio_skip(pb, WTV_PAD8(len) - consumed); + } + return AVERROR_EOF; +} + +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, (int64_t)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, 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) + 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); + } + + /* 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 (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); + + if (wtv->nb_index_entries) { + pb = wtvfile_open(s, root, root_size, ff_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 (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; + } + } + } + } + + 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; +} + +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, +}; |