January 2019 - ffmpeg-cvslog - lists.ffmpeg.org

avformat/hlsenc: add var_stream_map DEFAULT field status parameter
by Steven Liu 31 Jan '19

31 Jan '19

ffmpeg | branch: master | Steven Liu <lq(a)chinaffmpeg.org> | Wed Jan 23 18:52:02 2019 +0800| [6a25bb5aa42285441dbe7d3372f598bb7ac7c4bf] | committer: Steven Liu avformat/hlsenc: add var_stream_map DEFAULT field status parameter use a:0,agroup:aud_low,default:Yes a:1,agroup:aud_low, a:2,agroup:aud_high,default:Yes a:3, agroup:aud_high, v:0,agroup:aud_low v:1,agroup:aud_high create master m3u8 list. result: EXTM3U EXT-X-VERSION:3 EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="group_aud_low",NAME="audio_0",DEFAULT=YES,URI="out_0.m3u8" EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="group_aud_low",NAME="audio_1",DEFAULT=NO,URI="out_1.m3u8" EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="group_aud_high",NAME="audio_2",DEFAULT=YES,URI="out_2.m3u8" EXT-X-MEDIA:TYPE=AUDIO,GROUP-ID="group_aud_high",NAME="audio_3",DEFAULT=NO,URI="out_3.m3u8" EXT-X-STREAM-INF:BANDWIDTH=1170400,RESOLUTION=640x480,CODECS="avc1.64001e,mp4a.40.2",AUDIO="group_aud_low" out_4.m3u8 EXT-X-STREAM-INF:BANDWIDTH=3440800,RESOLUTION=640x480,CODECS="avc1.64001e,mp4a.40.2",AUDIO="group_aud_high" out_5.m3u8 Signed-off-by: Steven Liu <lq(a)chinaffmpeg.org> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6a25bb5aa42285441… --- doc/muxers.texi | 15 +++++++++++++++ libavformat/hlsenc.c | 29 ++++++++++++++++++++++++----- 2 files changed, 39 insertions(+), 5 deletions(-) diff --git a/doc/muxers.texi b/doc/muxers.texi index d2d985f1ac..60c22ddd26 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -967,6 +967,21 @@ and they are mapped to the two video only variant streams with audio group names By default, a single hls variant containing all the encoded streams is created. +@example +ffmpeg -re -i in.ts -b:a:0 32k -b:a:1 64k -b:v:0 1000k \ + -map 0:a -map 0:a -map 0:v -f hls \ + -var_stream_map "a:0,agroup:aud_low,default:yes a:1,agroup:aud_low v:0,agroup:aud_low" \ + -master_pl_name master.m3u8 \ + http://example.com/live/out_%v.m3u8 +@end example +This example creates two audio only and one video only variant streams. In +addition to the #EXT-X-STREAM-INF tag for each variant stream in the master +playlist, #EXT-X-MEDIA tag is also added for the two audio only variant streams +and they are mapped to the one video only variant streams with audio group name +'aud_low', and the audio group have default stat is NO or YES. + +By default, a single hls variant containing all the encoded streams is created. + @item cc_stream_map Map string which specifies different closed captions groups and their attributes. The closed captions stream groups are separated by space. diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c index eb094f7490..e6628145f8 100644 --- a/libavformat/hlsenc.c +++ b/libavformat/hlsenc.c @@ -153,6 +153,7 @@ typedef struct VariantStream { CodecAttributeStatus attr_status; unsigned int nb_streams; int m3u8_created; /* status of media play-list creation */ + int is_default; /* default status of audio group */ char *agroup; /* audio group name */ char *ccgroup; /* closed caption group name */ char *baseurl; @@ -228,6 +229,8 @@ typedef struct HLSContext { AVIOContext *sub_m3u8_out; int64_t timeout; int ignore_io_errors; + int has_default_key; /* has DEFAULT field of var_stream_map */ + int has_video_m3u8; /* has video stream m3u8 list */ } HLSContext; static int hlsenc_io_open(AVFormatContext *s, AVIOContext **pb, char *filename, @@ -1258,7 +1261,7 @@ static int create_master_playlist(AVFormatContext *s, goto fail; } - ff_hls_write_audio_rendition(hls->m3u8_out, vs->agroup, m3u8_rel_name, i, 1); + ff_hls_write_audio_rendition(hls->m3u8_out, vs->agroup, m3u8_rel_name, i, hls->has_default_key ? vs->is_default : 1); av_freep(&m3u8_rel_name); } @@ -1336,8 +1339,15 @@ static int create_master_playlist(AVFormatContext *s, vs->ccgroup); } - ff_hls_write_stream_info(vid_st, hls->m3u8_out, bandwidth, m3u8_rel_name, - aud_st ? vs->agroup : NULL, vs->codec_attr, ccgroup); + if (!hls->has_default_key || !hls->has_video_m3u8) { + ff_hls_write_stream_info(vid_st, hls->m3u8_out, bandwidth, m3u8_rel_name, + aud_st ? vs->agroup : NULL, vs->codec_attr, ccgroup); + } else { + if (vid_st) { + ff_hls_write_stream_info(vid_st, hls->m3u8_out, bandwidth, m3u8_rel_name, + aud_st ? vs->agroup : NULL, vs->codec_attr, ccgroup); + } + } av_freep(&m3u8_rel_name); } @@ -1819,7 +1829,7 @@ static int parse_variant_stream_mapstring(AVFormatContext *s) /** * Expected format for var_stream_map string is as below: * "a:0,v:0 a:1,v:1" - * "a:0,agroup:a0 a:1,agroup:a1 v:0,agroup:a0 v:1,agroup:a1" + * "a:0,agroup:a0,default:1 a:1,agroup:a1,defalut:0 v:0,agroup:a0 v:1,agroup:a1" * This string specifies how to group the audio, video and subtitle streams * into different variant streams. The variant stream groups are separated * by space. @@ -1850,6 +1860,7 @@ static int parse_variant_stream_mapstring(AVFormatContext *s) if (nb_varstreams < hls->nb_varstreams) { vs = &(hls->var_streams[nb_varstreams]); vs->var_stream_idx = nb_varstreams; + vs->is_default = 0; nb_varstreams++; } else return AVERROR(EINVAL); @@ -1869,7 +1880,12 @@ static int parse_variant_stream_mapstring(AVFormatContext *s) while (keyval = av_strtok(varstr, ",", &saveptr2)) { varstr = NULL; - if (av_strstart(keyval, "agroup:", &val)) { + if (av_strstart(keyval, "default:", &val)) { + vs->is_default = (!av_strncasecmp(val, "YES", strlen("YES")) || + (!av_strncasecmp(val, "1", strlen("1")))); + hls->has_default_key = 1; + continue; + } else if (av_strstart(keyval, "agroup:", &val)) { vs->agroup = av_strdup(val); if (!vs->agroup) return AVERROR(ENOMEM); @@ -1881,6 +1897,7 @@ static int parse_variant_stream_mapstring(AVFormatContext *s) continue; } else if (av_strstart(keyval, "v:", &val)) { codec_type = AVMEDIA_TYPE_VIDEO; + hls->has_video_m3u8 = 1; } else if (av_strstart(keyval, "a:", &val)) { codec_type = AVMEDIA_TYPE_AUDIO; } else if (av_strstart(keyval, "s:", &val)) { @@ -2519,6 +2536,8 @@ static int hls_init(AVFormatContext *s) int vtt_basename_size = 0; int fmp4_init_filename_len = strlen(hls->fmp4_init_filename) + 1; + hls->has_default_key = 0; + hls->has_video_m3u8 = 0; ret = update_variant_stream_info(s); if (ret < 0) { av_log(s, AV_LOG_ERROR, "Variant stream info update failed with status %x\n",

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avformat/hlsenc: make the EXT-X-MEDIA NAME field by stream id.
by Steven Liu 31 Jan '19

31 Jan '19

ffmpeg | branch: master | Steven Liu <lq(a)chinaffmpeg.org> | Mon Jan 21 16:32:57 2019 +0800| [62e8644bcadb82e0ed542b6baacff1c9e15b88c2] | committer: Steven Liu avformat/hlsenc: make the EXT-X-MEDIA NAME field by stream id. Signed-off-by: Steven Liu <lq(a)chinaffmpeg.org> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=62e8644bcadb82e0e… --- libavformat/hlsenc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c index ca57694e9e..eb094f7490 100644 --- a/libavformat/hlsenc.c +++ b/libavformat/hlsenc.c @@ -1258,7 +1258,7 @@ static int create_master_playlist(AVFormatContext *s, goto fail; } - ff_hls_write_audio_rendition(hls->m3u8_out, vs->agroup, m3u8_rel_name, 0, 1); + ff_hls_write_audio_rendition(hls->m3u8_out, vs->agroup, m3u8_rel_name, i, 1); av_freep(&m3u8_rel_name); }

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avformat/rtsp: Clear reply in every iteration in ff_rtsp_connect()
by Michael Niedermayer 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Michael Niedermayer <michael(a)niedermayer.cc> | Mon Jan 28 00:53:22 2019 +0100| [0b50f27635f684ec0526e9975c9979f35bbf486b] | committer: Michael Niedermayer avformat/rtsp: Clear reply in every iteration in ff_rtsp_connect() Fixes: Infinite loop Found-by: Michael Hanselmann <public(a)hansmi.ch> Reviewed-by: Michael Hanselmann <public(a)hansmi.ch> Signed-off-by: Michael Niedermayer <michael(a)niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0b50f27635f684ec0… --- libavformat/rtsp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c index ceb770a3a4..82c6c12af5 100644 --- a/libavformat/rtsp.c +++ b/libavformat/rtsp.c @@ -1663,7 +1663,7 @@ int ff_rtsp_connect(AVFormatContext *s) char tcpname[1024], cmd[2048], auth[128]; const char *lower_rtsp_proto = "tcp"; int port, err, tcp_fd; - RTSPMessageHeader reply1 = {0}, *reply = &reply1; + RTSPMessageHeader reply1, *reply = &reply1; int lower_transport_mask = 0; int default_port = RTSP_DEFAULT_PORT; char real_challenge[64] = ""; @@ -1692,6 +1692,7 @@ int ff_rtsp_connect(AVFormatContext *s) rt->lower_transport_mask &= (1 << RTSP_LOWER_TRANSPORT_NB) - 1; redirect: + memset(&reply1, 0, sizeof(reply1)); /* extract hostname and port */ av_url_split(proto, sizeof(proto), auth, sizeof(auth), host, sizeof(host), &port, path, sizeof(path), s->url);

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avcodec/rasc: Move ff_get_buffer() after frame checks
by Michael Niedermayer 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Michael Niedermayer <michael(a)niedermayer.cc> | Wed Jan 23 00:19:14 2019 +0100| [9f4af97aff899571663342fbe68df8caee30097f] | committer: Michael Niedermayer avcodec/rasc: Move ff_get_buffer() after frame checks If the frame1/2 checks fail this avoids doing the allocation of a new frame Signed-off-by: Michael Niedermayer <michael(a)niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9f4af97aff8995716… --- libavcodec/rasc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/libavcodec/rasc.c b/libavcodec/rasc.c index 6e32c1540e..21fc43f325 100644 --- a/libavcodec/rasc.c +++ b/libavcodec/rasc.c @@ -723,12 +723,12 @@ static int decode_frame(AVCodecContext *avctx, return ret; } - if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0) - return ret; - if (!s->frame2->data[0] || !s->frame1->data[0]) return AVERROR_INVALIDDATA; + if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0) + return ret; + copy_plane(avctx, s->frame2, s->frame); if (avctx->pix_fmt == AV_PIX_FMT_PAL8) memcpy(s->frame->data[1], s->frame2->data[1], 1024);

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avcodec/rasc: Check uncompressed dlta size
by Michael Niedermayer 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Michael Niedermayer <michael(a)niedermayer.cc> | Wed Jan 23 00:16:02 2019 +0100| [f4079d5174c20eddbc99eef6ebe98d411f8014c5] | committer: Michael Niedermayer avcodec/rasc: Check uncompressed dlta size We assume that if the compressed size is bigger than if each byte is encoded in a single raw packet that the data is invalid. Fixes: Out of memory Fixes: 12208/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RASC_fuzzer-5648916473708544 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael(a)niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f4079d5174c20eddb… --- libavcodec/rasc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavcodec/rasc.c b/libavcodec/rasc.c index 1b607ac31e..6e32c1540e 100644 --- a/libavcodec/rasc.c +++ b/libavcodec/rasc.c @@ -353,6 +353,8 @@ static int decode_dlta(AVCodecContext *avctx, compression = bytestream2_get_le32(gb); if (compression == 1) { + if (w * h * s->bpp * 3 < uncompressed_size) + return AVERROR_INVALIDDATA; ret = decode_zlib(avctx, avpkt, size, uncompressed_size); if (ret < 0) return ret;

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avcodec/fic: Check that there is input left in fic_decode_block()
by Michael Niedermayer 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Michael Niedermayer <michael(a)niedermayer.cc> | Wed Jan 23 00:30:53 2019 +0100| [db1c4acd02af4de5dfbea6012c296470679aa7a6] | committer: Michael Niedermayer avcodec/fic: Check that there is input left in fic_decode_block() Fixes: Timeout Fixes: 12450/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FIC_fuzzer-5661984622641152 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael(a)niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=db1c4acd02af4de5d… --- libavcodec/fic.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/fic.c b/libavcodec/fic.c index 8833536330..65d102b86b 100644 --- a/libavcodec/fic.c +++ b/libavcodec/fic.c @@ -139,6 +139,9 @@ static int fic_decode_block(FICContext *ctx, GetBitContext *gb, { int i, num_coeff; + if (get_bits_left(gb) < 8) + return AVERROR_INVALIDDATA; + /* Is it a skip block? */ if (get_bits1(gb)) { *is_p = 1;

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avformat/flvdec: Try to support some concatenated flv files
by Michael Niedermayer 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Michael Niedermayer <michael(a)niedermayer.cc> | Thu Jan 3 01:08:31 2019 +0100| [b559c58a03f88dcbf1e61875bb494743d4c6d081] | committer: Michael Niedermayer avformat/flvdec: Try to support some concatenated flv files Fixes: discont.flv Signed-off-by: Michael Niedermayer <michael(a)niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b559c58a03f88dcbf… --- libavformat/flvdec.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c index 4b9f46902b..972e333313 100644 --- a/libavformat/flvdec.c +++ b/libavformat/flvdec.c @@ -72,6 +72,9 @@ typedef struct FLVContext { int64_t *keyframe_filepositions; int missing_streams; AVRational framerate; + int64_t last_ts; + int64_t time_offset; + int64_t time_pos; } FLVContext; static int probe(AVProbeData *p, int live) @@ -917,6 +920,18 @@ static int resync(AVFormatContext *s) flv->resync_buffer[j ] = flv->resync_buffer[j1] = avio_r8(s->pb); + if (i >= 8 && pos) { + uint8_t *d = flv->resync_buffer + j1 - 8; + if (d[0] == 'F' && + d[1] == 'L' && + d[2] == 'V' && + d[3] < 5 && d[5] == 0) { + av_log(s, AV_LOG_WARNING, "Concatenated FLV detected, might fail to demux, decode and seek %"PRId64"\n", flv->last_ts); + flv->time_offset = flv->last_ts + 1; + flv->time_pos = avio_tell(s->pb); + } + } + if (i > 22) { unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4); if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) { @@ -1072,6 +1087,10 @@ skip: } av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard); + if (flv->time_pos <= pos) { + dts += flv->time_offset; + } + if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || stream_type == FLV_STREAM_TYPE_AUDIO)) @@ -1282,6 +1301,10 @@ leave: } } } + + if (ret >= 0) + flv->last_ts = pkt->dts; + return ret; }

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lavf/asf: Remove an unneeded forward declaration.
by Carl Eugen Hoyos 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Carl Eugen Hoyos <ceffmpeg(a)gmail.com> | Wed Jan 30 23:15:28 2019 +0100| [8a23a2b7de386a98d8da5e0d5b6d8880413c5f46] | committer: Carl Eugen Hoyos lavf/asf: Remove an unneeded forward declaration. > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8a23a2b7de386a98d… --- libavformat/asf.h | 2 -- 1 file changed, 2 deletions(-) diff --git a/libavformat/asf.h b/libavformat/asf.h index 1a5b33840f..a30d3bb23b 100644 --- a/libavformat/asf.h +++ b/libavformat/asf.h @@ -166,6 +166,4 @@ extern const AVMetadataConv ff_asf_metadata_conv[]; #define ASF_PL_FLAG_KEY_FRAME 0x80 //1000 0000 -extern AVInputFormat ff_asf_demuxer; - #endif /* AVFORMAT_ASF_H */

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libavdevice/gdigrab: fix HIDPI support for mouse positioning
by Dilshod Mukhtarov 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Dilshod Mukhtarov <dilshodm(a)gmail.com> | Sun Jan 27 23:10:37 2019 +0400| [1100862a94ea960c2cb2392edf9c9670f78b74e9] | committer: Carl Eugen Hoyos libavdevice/gdigrab: fix HIDPI support for mouse positioning Mouse position was not calculated properly in area or window mode Signed-off-by: Dilshod Mukhtarov <dilshodm(a)gmail.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1100862a94ea960c2… --- libavdevice/gdigrab.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/libavdevice/gdigrab.c b/libavdevice/gdigrab.c index 0e6ae2bd5d..b226bd0831 100644 --- a/libavdevice/gdigrab.c +++ b/libavdevice/gdigrab.c @@ -479,25 +479,26 @@ static void paint_mouse_pointer(AVFormatContext *s1, struct gdigrab *gdigrab) goto icon_error; } - pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot; - pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot; - if (hwnd) { RECT rect; if (GetWindowRect(hwnd, &rect)) { - pos.x -= rect.left; - pos.y -= rect.top; + pos.x = ci.ptScreenPos.x - clip_rect.left - info.xHotspot - rect.left; + pos.y = ci.ptScreenPos.y - clip_rect.top - info.yHotspot - rect.top; + + //that would keep the correct location of mouse with hidpi screens + pos.x = pos.x * desktophorzres / horzres; + pos.y = pos.y * desktopvertres / vertres; } else { CURSOR_ERROR("Couldn't get window rectangle"); goto icon_error; } + } else { + //that would keep the correct location of mouse with hidpi screens + pos.x = ci.ptScreenPos.x * desktophorzres / horzres - clip_rect.left - info.xHotspot; + pos.y = ci.ptScreenPos.y * desktopvertres / vertres - clip_rect.top - info.yHotspot; } - //that would keep the correct location of mouse with hidpi screens - pos.x = pos.x * desktophorzres / horzres; - pos.y = pos.y * desktopvertres / vertres; - av_log(s1, AV_LOG_DEBUG, "Cursor pos (%li,%li) -> (%li,%li)\n", ci.ptScreenPos.x, ci.ptScreenPos.y, pos.x, pos.y);

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libavdevice/gdigrab: fix HIDPI support for window capture
by Dilshod Mukhtarov 30 Jan '19

30 Jan '19

ffmpeg | branch: master | Dilshod Mukhtarov <dilshodm(a)gmail.com> | Sun Jan 27 23:09:53 2019 +0400| [d7c9ddd0c4b02c1e8872a299a6613f9b55b858a4] | committer: Carl Eugen Hoyos libavdevice/gdigrab: fix HIDPI support for window capture In Windows if using scaling other than 100% then the grabbed window was not captured fully (cropped) Signed-off-by: Dilshod Mukhtarov <dilshodm(a)gmail.com> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d7c9ddd0c4b02c1e8… --- libavdevice/gdigrab.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/libavdevice/gdigrab.c b/libavdevice/gdigrab.c index ab08c11788..0e6ae2bd5d 100644 --- a/libavdevice/gdigrab.c +++ b/libavdevice/gdigrab.c @@ -277,14 +277,20 @@ gdigrab_read_header(AVFormatContext *s1) } bpp = GetDeviceCaps(source_hdc, BITSPIXEL); + horzres = GetDeviceCaps(source_hdc, HORZRES); + vertres = GetDeviceCaps(source_hdc, VERTRES); + desktophorzres = GetDeviceCaps(source_hdc, DESKTOPHORZRES); + desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES); + if (hwnd) { GetClientRect(hwnd, &virtual_rect); + /* window -- get the right height and width for scaling DPI */ + virtual_rect.left = virtual_rect.left * desktophorzres / horzres; + virtual_rect.right = virtual_rect.right * desktophorzres / horzres; + virtual_rect.top = virtual_rect.top * desktopvertres / vertres; + virtual_rect.bottom = virtual_rect.bottom * desktopvertres / vertres; } else { /* desktop -- get the right height and width for scaling DPI */ - horzres = GetDeviceCaps(source_hdc, HORZRES); - vertres = GetDeviceCaps(source_hdc, VERTRES); - desktophorzres = GetDeviceCaps(source_hdc, DESKTOPHORZRES); - desktopvertres = GetDeviceCaps(source_hdc, DESKTOPVERTRES); virtual_rect.left = GetSystemMetrics(SM_XVIRTUALSCREEN); virtual_rect.top = GetSystemMetrics(SM_YVIRTUALSCREEN); virtual_rect.right = (virtual_rect.left + GetSystemMetrics(SM_CXVIRTUALSCREEN)) * desktophorzres / horzres;

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