| /* |
| * VFW capture interface |
| * Copyright (c) 2006-2008 Ramiro Polla |
| * |
| * 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 |
| */ |
| |
| #include "libavutil/internal.h" |
| #include "libavutil/log.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| |
| #include "libavformat/internal.h" |
| |
| // windows.h must no be included before winsock2.h, and libavformat internal |
| // headers may include winsock2.h |
| #include <windows.h> |
| // windows.h needs to be included before vfw.h |
| #include <vfw.h> |
| |
| #include "avdevice.h" |
| |
| /* Some obsolete versions of MinGW32 before 4.0.0 lack this. */ |
| #ifndef HWND_MESSAGE |
| #define HWND_MESSAGE ((HWND) -3) |
| #endif |
| |
| struct vfw_ctx { |
| const AVClass *class; |
| HWND hwnd; |
| HANDLE mutex; |
| HANDLE event; |
| AVPacketList *pktl; |
| unsigned int curbufsize; |
| unsigned int frame_num; |
| char *video_size; /**< A string describing video size, set by a private option. */ |
| char *framerate; /**< Set by a private option. */ |
| }; |
| |
| static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount) |
| { |
| switch(biCompression) { |
| case MKTAG('U', 'Y', 'V', 'Y'): |
| return AV_PIX_FMT_UYVY422; |
| case MKTAG('Y', 'U', 'Y', '2'): |
| return AV_PIX_FMT_YUYV422; |
| case MKTAG('I', '4', '2', '0'): |
| return AV_PIX_FMT_YUV420P; |
| case BI_RGB: |
| switch(biBitCount) { /* 1-8 are untested */ |
| case 1: |
| return AV_PIX_FMT_MONOWHITE; |
| case 4: |
| return AV_PIX_FMT_RGB4; |
| case 8: |
| return AV_PIX_FMT_RGB8; |
| case 16: |
| return AV_PIX_FMT_RGB555; |
| case 24: |
| return AV_PIX_FMT_BGR24; |
| case 32: |
| return AV_PIX_FMT_RGB32; |
| } |
| } |
| return AV_PIX_FMT_NONE; |
| } |
| |
| static enum AVCodecID vfw_codecid(DWORD biCompression) |
| { |
| switch(biCompression) { |
| case MKTAG('d', 'v', 's', 'd'): |
| return AV_CODEC_ID_DVVIDEO; |
| case MKTAG('M', 'J', 'P', 'G'): |
| case MKTAG('m', 'j', 'p', 'g'): |
| return AV_CODEC_ID_MJPEG; |
| } |
| return AV_CODEC_ID_NONE; |
| } |
| |
| #define dstruct(pctx, sname, var, type) \ |
| av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var) |
| |
| static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms) |
| { |
| av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n"); |
| dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu"); |
| dstruct(s, cparms, fMakeUserHitOKToCapture, "d"); |
| dstruct(s, cparms, wPercentDropForError, "u"); |
| dstruct(s, cparms, fYield, "d"); |
| dstruct(s, cparms, dwIndexSize, "lu"); |
| dstruct(s, cparms, wChunkGranularity, "u"); |
| dstruct(s, cparms, fUsingDOSMemory, "d"); |
| dstruct(s, cparms, wNumVideoRequested, "u"); |
| dstruct(s, cparms, fCaptureAudio, "d"); |
| dstruct(s, cparms, wNumAudioRequested, "u"); |
| dstruct(s, cparms, vKeyAbort, "u"); |
| dstruct(s, cparms, fAbortLeftMouse, "d"); |
| dstruct(s, cparms, fAbortRightMouse, "d"); |
| dstruct(s, cparms, fLimitEnabled, "d"); |
| dstruct(s, cparms, wTimeLimit, "u"); |
| dstruct(s, cparms, fMCIControl, "d"); |
| dstruct(s, cparms, fStepMCIDevice, "d"); |
| dstruct(s, cparms, dwMCIStartTime, "lu"); |
| dstruct(s, cparms, dwMCIStopTime, "lu"); |
| dstruct(s, cparms, fStepCaptureAt2x, "d"); |
| dstruct(s, cparms, wStepCaptureAverageFrames, "u"); |
| dstruct(s, cparms, dwAudioBufferSize, "lu"); |
| dstruct(s, cparms, fDisableWriteCache, "d"); |
| dstruct(s, cparms, AVStreamMaster, "u"); |
| } |
| |
| static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr) |
| { |
| #ifdef DEBUG |
| av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n"); |
| dstruct(s, vhdr, lpData, "p"); |
| dstruct(s, vhdr, dwBufferLength, "lu"); |
| dstruct(s, vhdr, dwBytesUsed, "lu"); |
| dstruct(s, vhdr, dwTimeCaptured, "lu"); |
| dstruct(s, vhdr, dwUser, "lu"); |
| dstruct(s, vhdr, dwFlags, "lu"); |
| dstruct(s, vhdr, dwReserved[0], "lu"); |
| dstruct(s, vhdr, dwReserved[1], "lu"); |
| dstruct(s, vhdr, dwReserved[2], "lu"); |
| dstruct(s, vhdr, dwReserved[3], "lu"); |
| #endif |
| } |
| |
| static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih) |
| { |
| av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n"); |
| dstruct(s, bih, biSize, "lu"); |
| dstruct(s, bih, biWidth, "ld"); |
| dstruct(s, bih, biHeight, "ld"); |
| dstruct(s, bih, biPlanes, "d"); |
| dstruct(s, bih, biBitCount, "d"); |
| dstruct(s, bih, biCompression, "lu"); |
| av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n", |
| (char*) &bih->biCompression); |
| dstruct(s, bih, biSizeImage, "lu"); |
| dstruct(s, bih, biXPelsPerMeter, "lu"); |
| dstruct(s, bih, biYPelsPerMeter, "lu"); |
| dstruct(s, bih, biClrUsed, "lu"); |
| dstruct(s, bih, biClrImportant, "lu"); |
| } |
| |
| static int shall_we_drop(AVFormatContext *s) |
| { |
| struct vfw_ctx *ctx = s->priv_data; |
| static const uint8_t dropscore[] = {62, 75, 87, 100}; |
| const int ndropscores = FF_ARRAY_ELEMS(dropscore); |
| unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer; |
| |
| if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) { |
| av_log(s, AV_LOG_ERROR, |
| "real-time buffer %d%% full! frame dropped!\n", buffer_fullness); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr) |
| { |
| AVFormatContext *s; |
| struct vfw_ctx *ctx; |
| AVPacketList **ppktl, *pktl_next; |
| |
| s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA); |
| ctx = s->priv_data; |
| |
| dump_videohdr(s, vdhdr); |
| |
| if(shall_we_drop(s)) |
| return FALSE; |
| |
| WaitForSingleObject(ctx->mutex, INFINITE); |
| |
| pktl_next = av_mallocz(sizeof(AVPacketList)); |
| if(!pktl_next) |
| goto fail; |
| |
| if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) { |
| av_free(pktl_next); |
| goto fail; |
| } |
| |
| pktl_next->pkt.pts = vdhdr->dwTimeCaptured; |
| memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed); |
| |
| for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next); |
| *ppktl = pktl_next; |
| |
| ctx->curbufsize += vdhdr->dwBytesUsed; |
| |
| SetEvent(ctx->event); |
| ReleaseMutex(ctx->mutex); |
| |
| return TRUE; |
| fail: |
| ReleaseMutex(ctx->mutex); |
| return FALSE; |
| } |
| |
| static int vfw_read_close(AVFormatContext *s) |
| { |
| struct vfw_ctx *ctx = s->priv_data; |
| AVPacketList *pktl; |
| |
| if(ctx->hwnd) { |
| SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0); |
| SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0); |
| DestroyWindow(ctx->hwnd); |
| } |
| if(ctx->mutex) |
| CloseHandle(ctx->mutex); |
| if(ctx->event) |
| CloseHandle(ctx->event); |
| |
| pktl = ctx->pktl; |
| while (pktl) { |
| AVPacketList *next = pktl->next; |
| av_packet_unref(&pktl->pkt); |
| av_free(pktl); |
| pktl = next; |
| } |
| |
| return 0; |
| } |
| |
| static int vfw_read_header(AVFormatContext *s) |
| { |
| struct vfw_ctx *ctx = s->priv_data; |
| AVCodecContext *codec; |
| AVStream *st; |
| int devnum; |
| int bisize; |
| BITMAPINFO *bi = NULL; |
| CAPTUREPARMS cparms; |
| DWORD biCompression; |
| WORD biBitCount; |
| int ret; |
| AVRational framerate_q; |
| |
| if (!strcmp(s->filename, "list")) { |
| for (devnum = 0; devnum <= 9; devnum++) { |
| char driver_name[256]; |
| char driver_ver[256]; |
| ret = capGetDriverDescription(devnum, |
| driver_name, sizeof(driver_name), |
| driver_ver, sizeof(driver_ver)); |
| if (ret) { |
| av_log(s, AV_LOG_INFO, "Driver %d\n", devnum); |
| av_log(s, AV_LOG_INFO, " %s\n", driver_name); |
| av_log(s, AV_LOG_INFO, " %s\n", driver_ver); |
| } |
| } |
| return AVERROR(EIO); |
| } |
| |
| ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0); |
| if(!ctx->hwnd) { |
| av_log(s, AV_LOG_ERROR, "Could not create capture window.\n"); |
| return AVERROR(EIO); |
| } |
| |
| /* If atoi fails, devnum==0 and the default device is used */ |
| devnum = atoi(s->filename); |
| |
| ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0); |
| if(!ret) { |
| av_log(s, AV_LOG_ERROR, "Could not connect to device.\n"); |
| DestroyWindow(ctx->hwnd); |
| return AVERROR(ENODEV); |
| } |
| |
| SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0); |
| SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0); |
| |
| ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, |
| (LPARAM) videostream_cb); |
| if(!ret) { |
| av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n"); |
| goto fail; |
| } |
| |
| SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s); |
| |
| st = avformat_new_stream(s, NULL); |
| if(!st) { |
| vfw_read_close(s); |
| return AVERROR(ENOMEM); |
| } |
| |
| /* Set video format */ |
| bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0); |
| if(!bisize) |
| goto fail; |
| bi = av_malloc(bisize); |
| if(!bi) { |
| vfw_read_close(s); |
| return AVERROR(ENOMEM); |
| } |
| ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi); |
| if(!ret) |
| goto fail; |
| |
| dump_bih(s, &bi->bmiHeader); |
| |
| ret = av_parse_video_rate(&framerate_q, ctx->framerate); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate); |
| goto fail; |
| } |
| |
| if (ctx->video_size) { |
| ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n"); |
| goto fail; |
| } |
| } |
| |
| if (0) { |
| /* For testing yet unsupported compressions |
| * Copy these values from user-supplied verbose information */ |
| bi->bmiHeader.biWidth = 320; |
| bi->bmiHeader.biHeight = 240; |
| bi->bmiHeader.biPlanes = 1; |
| bi->bmiHeader.biBitCount = 12; |
| bi->bmiHeader.biCompression = MKTAG('I','4','2','0'); |
| bi->bmiHeader.biSizeImage = 115200; |
| dump_bih(s, &bi->bmiHeader); |
| } |
| |
| ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi); |
| if(!ret) { |
| av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n"); |
| goto fail; |
| } |
| |
| biCompression = bi->bmiHeader.biCompression; |
| biBitCount = bi->bmiHeader.biBitCount; |
| |
| /* Set sequence setup */ |
| ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms), |
| (LPARAM) &cparms); |
| if(!ret) |
| goto fail; |
| |
| dump_captureparms(s, &cparms); |
| |
| cparms.fYield = 1; // Spawn a background thread |
| cparms.dwRequestMicroSecPerFrame = |
| (framerate_q.den*1000000) / framerate_q.num; |
| cparms.fAbortLeftMouse = 0; |
| cparms.fAbortRightMouse = 0; |
| cparms.fCaptureAudio = 0; |
| cparms.vKeyAbort = 0; |
| |
| ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms), |
| (LPARAM) &cparms); |
| if(!ret) |
| goto fail; |
| |
| codec = st->codec; |
| codec->time_base = av_inv_q(framerate_q); |
| codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| codec->width = bi->bmiHeader.biWidth; |
| codec->height = bi->bmiHeader.biHeight; |
| codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount); |
| if(codec->pix_fmt == AV_PIX_FMT_NONE) { |
| codec->codec_id = vfw_codecid(biCompression); |
| if(codec->codec_id == AV_CODEC_ID_NONE) { |
| av_log(s, AV_LOG_ERROR, "Unknown compression type. " |
| "Please report verbose (-v 9) debug information.\n"); |
| vfw_read_close(s); |
| return AVERROR_PATCHWELCOME; |
| } |
| codec->bits_per_coded_sample = biBitCount; |
| } else { |
| codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
| if(biCompression == BI_RGB) { |
| codec->bits_per_coded_sample = biBitCount; |
| codec->extradata = av_malloc(9 + AV_INPUT_BUFFER_PADDING_SIZE); |
| if (codec->extradata) { |
| codec->extradata_size = 9; |
| memcpy(codec->extradata, "BottomUp", 9); |
| } |
| } |
| } |
| |
| av_freep(&bi); |
| |
| avpriv_set_pts_info(st, 32, 1, 1000); |
| |
| ctx->mutex = CreateMutex(NULL, 0, NULL); |
| if(!ctx->mutex) { |
| av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" ); |
| goto fail; |
| } |
| ctx->event = CreateEvent(NULL, 1, 0, NULL); |
| if(!ctx->event) { |
| av_log(s, AV_LOG_ERROR, "Could not create Event.\n" ); |
| goto fail; |
| } |
| |
| ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0); |
| if(!ret) { |
| av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" ); |
| goto fail; |
| } |
| |
| return 0; |
| |
| fail: |
| av_freep(&bi); |
| vfw_read_close(s); |
| return AVERROR(EIO); |
| } |
| |
| static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| struct vfw_ctx *ctx = s->priv_data; |
| AVPacketList *pktl = NULL; |
| |
| while(!pktl) { |
| WaitForSingleObject(ctx->mutex, INFINITE); |
| pktl = ctx->pktl; |
| if(ctx->pktl) { |
| *pkt = ctx->pktl->pkt; |
| ctx->pktl = ctx->pktl->next; |
| av_free(pktl); |
| } |
| ResetEvent(ctx->event); |
| ReleaseMutex(ctx->mutex); |
| if(!pktl) { |
| if(s->flags & AVFMT_FLAG_NONBLOCK) { |
| return AVERROR(EAGAIN); |
| } else { |
| WaitForSingleObject(ctx->event, INFINITE); |
| } |
| } |
| } |
| |
| ctx->curbufsize -= pkt->size; |
| |
| return pkt->size; |
| } |
| |
| #define OFFSET(x) offsetof(struct vfw_ctx, x) |
| #define DEC AV_OPT_FLAG_DECODING_PARAM |
| static const AVOption options[] = { |
| { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC }, |
| { NULL }, |
| }; |
| |
| static const AVClass vfw_class = { |
| .class_name = "VFW indev", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| .category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT |
| }; |
| |
| AVInputFormat ff_vfwcap_demuxer = { |
| .name = "vfwcap", |
| .long_name = NULL_IF_CONFIG_SMALL("VfW video capture"), |
| .priv_data_size = sizeof(struct vfw_ctx), |
| .read_header = vfw_read_header, |
| .read_packet = vfw_read_packet, |
| .read_close = vfw_read_close, |
| .flags = AVFMT_NOFILE, |
| .priv_class = &vfw_class, |
| }; |