/* * 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 "libavformat/avformat.h" #include <windows.h> #include <vfw.h> //#define DEBUG_VFW /* Defines for VFW missing from MinGW. * Remove this when MinGW incorporates them. */ #define HWND_MESSAGE ((HWND)-3) #define BI_RGB 0 /* End of missing MinGW defines */ struct vfw_ctx { HWND hwnd; HANDLE mutex; HANDLE event; AVPacketList *pktl; unsigned int curbufsize; unsigned int frame_num; }; static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount) { switch(biCompression) { case MKTAG('U', 'Y', 'V', 'Y'): return PIX_FMT_UYVY422; case MKTAG('Y', 'U', 'Y', '2'): return PIX_FMT_YUYV422; case MKTAG('I', '4', '2', '0'): return PIX_FMT_YUV420P; case BI_RGB: switch(biBitCount) { /* 1-8 are untested */ case 1: return PIX_FMT_MONOWHITE; case 4: return PIX_FMT_RGB4; case 8: return PIX_FMT_RGB8; case 16: return PIX_FMT_RGB555; case 24: return PIX_FMT_BGR24; case 32: return PIX_FMT_RGB32; } } return PIX_FMT_NONE; } static enum CodecID vfw_codecid(DWORD biCompression) { switch(biCompression) { case MKTAG('d', 'v', 's', 'd'): return CODEC_ID_DVVIDEO; case MKTAG('M', 'J', 'P', 'G'): case MKTAG('m', 'j', 'p', 'g'): return CODEC_ID_MJPEG; } return 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_VFW 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; 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_destruct_packet(&pktl->pkt); av_free(pktl); pktl = next; } return 0; } static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap) { struct vfw_ctx *ctx = s->priv_data; AVCodecContext *codec; AVStream *st; int devnum; int bisize; BITMAPINFO *bi; CAPTUREPARMS cparms; DWORD biCompression; WORD biBitCount; int width; int height; int ret; if(!ap->time_base.den) { av_log(s, AV_LOG_ERROR, "A time base must be specified.\n"); 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_io; } SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s); st = av_new_stream(s, 0); if(!st) { vfw_read_close(s); return AVERROR_NOMEM; } /* Set video format */ bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0); if(!bisize) goto fail_io; bi = av_malloc(bisize); if(!bi) { vfw_read_close(s); return AVERROR_NOMEM; } ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi); if(!ret) goto fail_bi; dump_bih(s, &bi->bmiHeader); width = ap->width ? ap->width : bi->bmiHeader.biWidth ; height = ap->height ? ap->height : bi->bmiHeader.biHeight; bi->bmiHeader.biWidth = width ; bi->bmiHeader.biHeight = height; 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_bi; } biCompression = bi->bmiHeader.biCompression; biBitCount = bi->bmiHeader.biBitCount; av_free(bi); /* Set sequence setup */ ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms), (LPARAM) &cparms); if(!ret) goto fail_io; dump_captureparms(s, &cparms); cparms.fYield = 1; // Spawn a background thread cparms.dwRequestMicroSecPerFrame = (ap->time_base.num*1000000) / ap->time_base.den; 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_io; codec = st->codec; codec->time_base = ap->time_base; codec->codec_type = AVMEDIA_TYPE_VIDEO; codec->width = width; codec->height = height; codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount); if(codec->pix_fmt == PIX_FMT_NONE) { codec->codec_id = vfw_codecid(biCompression); if(codec->codec_id == 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 = CODEC_ID_RAWVIDEO; if(biCompression == BI_RGB) codec->bits_per_coded_sample = biBitCount; } av_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_io; } ctx->event = CreateEvent(NULL, 1, 0, NULL); if(!ctx->event) { av_log(s, AV_LOG_ERROR, "Could not create Event.\n" ); goto fail_io; } 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_io; } return 0; fail_bi: av_free(bi); fail_io: 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; } AVInputFormat vfwcap_demuxer = { "vfwcap", NULL_IF_CONFIG_SMALL("VFW video capture"), sizeof(struct vfw_ctx), NULL, vfw_read_header, vfw_read_packet, vfw_read_close, .flags = AVFMT_NOFILE, };