ffmpeg / libavdevice / vfwcap.c @ 2874c81c
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/*
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* VFW capture interface
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* Copyright (c) 2006-2008 Ramiro Polla
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavformat/avformat.h" |
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#include <windows.h> |
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#include <vfw.h> |
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//#define DEBUG_VFW
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/* Defines for VFW missing from MinGW.
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* Remove this when MinGW incorporates them. */
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#define HWND_MESSAGE ((HWND)-3) |
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#define BI_RGB 0 |
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/* End of missing MinGW defines */
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struct vfw_ctx {
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HWND hwnd; |
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HANDLE mutex; |
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HANDLE event; |
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AVPacketList *pktl; |
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unsigned int curbufsize; |
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unsigned int frame_num; |
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}; |
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static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount) |
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{ |
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switch(biCompression) {
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case MKTAG('U', 'Y', 'V', 'Y'): |
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return PIX_FMT_UYVY422;
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case MKTAG('Y', 'U', 'Y', '2'): |
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return PIX_FMT_YUYV422;
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case MKTAG('I', '4', '2', '0'): |
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return PIX_FMT_YUV420P;
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case BI_RGB:
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switch(biBitCount) { /* 1-8 are untested */ |
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case 1: |
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return PIX_FMT_MONOWHITE;
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case 4: |
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return PIX_FMT_RGB4;
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case 8: |
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return PIX_FMT_RGB8;
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case 16: |
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return PIX_FMT_RGB555;
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case 24: |
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return PIX_FMT_BGR24;
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case 32: |
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return PIX_FMT_RGB32;
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} |
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} |
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return PIX_FMT_NONE;
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} |
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static enum CodecID vfw_codecid(DWORD biCompression) |
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{ |
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switch(biCompression) {
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case MKTAG('d', 'v', 's', 'd'): |
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return CODEC_ID_DVVIDEO;
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case MKTAG('M', 'J', 'P', 'G'): |
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case MKTAG('m', 'j', 'p', 'g'): |
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return CODEC_ID_MJPEG;
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} |
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return CODEC_ID_NONE;
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} |
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#define dstruct(pctx, sname, var, type) \
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av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var) |
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static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms) |
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{ |
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av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
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dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
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dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
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dstruct(s, cparms, wPercentDropForError, "u");
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dstruct(s, cparms, fYield, "d");
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dstruct(s, cparms, dwIndexSize, "lu");
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dstruct(s, cparms, wChunkGranularity, "u");
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dstruct(s, cparms, fUsingDOSMemory, "d");
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dstruct(s, cparms, wNumVideoRequested, "u");
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dstruct(s, cparms, fCaptureAudio, "d");
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dstruct(s, cparms, wNumAudioRequested, "u");
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dstruct(s, cparms, vKeyAbort, "u");
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dstruct(s, cparms, fAbortLeftMouse, "d");
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dstruct(s, cparms, fAbortRightMouse, "d");
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dstruct(s, cparms, fLimitEnabled, "d");
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dstruct(s, cparms, wTimeLimit, "u");
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dstruct(s, cparms, fMCIControl, "d");
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dstruct(s, cparms, fStepMCIDevice, "d");
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dstruct(s, cparms, dwMCIStartTime, "lu");
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dstruct(s, cparms, dwMCIStopTime, "lu");
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dstruct(s, cparms, fStepCaptureAt2x, "d");
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dstruct(s, cparms, wStepCaptureAverageFrames, "u");
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dstruct(s, cparms, dwAudioBufferSize, "lu");
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dstruct(s, cparms, fDisableWriteCache, "d");
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dstruct(s, cparms, AVStreamMaster, "u");
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} |
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static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr) |
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{ |
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#ifdef DEBUG_VFW
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av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
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dstruct(s, vhdr, lpData, "p");
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dstruct(s, vhdr, dwBufferLength, "lu");
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dstruct(s, vhdr, dwBytesUsed, "lu");
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dstruct(s, vhdr, dwTimeCaptured, "lu");
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dstruct(s, vhdr, dwUser, "lu");
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dstruct(s, vhdr, dwFlags, "lu");
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dstruct(s, vhdr, dwReserved[0], "lu"); |
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dstruct(s, vhdr, dwReserved[1], "lu"); |
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dstruct(s, vhdr, dwReserved[2], "lu"); |
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dstruct(s, vhdr, dwReserved[3], "lu"); |
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#endif
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} |
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static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih) |
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{ |
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av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
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dstruct(s, bih, biSize, "lu");
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dstruct(s, bih, biWidth, "ld");
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dstruct(s, bih, biHeight, "ld");
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dstruct(s, bih, biPlanes, "d");
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dstruct(s, bih, biBitCount, "d");
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dstruct(s, bih, biCompression, "lu");
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av_log(s, AV_LOG_DEBUG, " biCompression:\t\"%.4s\"\n",
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(char*) &bih->biCompression);
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dstruct(s, bih, biSizeImage, "lu");
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dstruct(s, bih, biXPelsPerMeter, "lu");
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dstruct(s, bih, biYPelsPerMeter, "lu");
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dstruct(s, bih, biClrUsed, "lu");
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dstruct(s, bih, biClrImportant, "lu");
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} |
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static int shall_we_drop(AVFormatContext *s) |
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{ |
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struct vfw_ctx *ctx = s->priv_data;
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const uint8_t dropscore[] = {62, 75, 87, 100}; |
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const int ndropscores = FF_ARRAY_ELEMS(dropscore); |
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unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer; |
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if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
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av_log(s, AV_LOG_ERROR, |
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"real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
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return 1; |
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} |
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return 0; |
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} |
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static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
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{ |
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AVFormatContext *s; |
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struct vfw_ctx *ctx;
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AVPacketList **ppktl, *pktl_next; |
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s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA); |
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ctx = s->priv_data; |
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dump_videohdr(s, vdhdr); |
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if(shall_we_drop(s))
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return FALSE;
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WaitForSingleObject(ctx->mutex, INFINITE); |
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pktl_next = av_mallocz(sizeof(AVPacketList));
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if(!pktl_next)
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goto fail;
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if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) { |
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av_free(pktl_next); |
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goto fail;
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} |
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pktl_next->pkt.pts = vdhdr->dwTimeCaptured; |
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memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed); |
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for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
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*ppktl = pktl_next; |
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ctx->curbufsize += vdhdr->dwBytesUsed; |
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SetEvent(ctx->event); |
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ReleaseMutex(ctx->mutex); |
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return TRUE;
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fail:
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ReleaseMutex(ctx->mutex); |
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return FALSE;
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} |
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static int vfw_read_close(AVFormatContext *s) |
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{ |
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struct vfw_ctx *ctx = s->priv_data;
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AVPacketList *pktl; |
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if(ctx->hwnd) {
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SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0); |
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SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0); |
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DestroyWindow(ctx->hwnd); |
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} |
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if(ctx->mutex)
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CloseHandle(ctx->mutex); |
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if(ctx->event)
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CloseHandle(ctx->event); |
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pktl = ctx->pktl; |
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while (pktl) {
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AVPacketList *next = pktl->next; |
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av_destruct_packet(&pktl->pkt); |
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av_free(pktl); |
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pktl = next; |
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} |
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return 0; |
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} |
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static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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struct vfw_ctx *ctx = s->priv_data;
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AVCodecContext *codec; |
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AVStream *st; |
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int devnum;
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int bisize;
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BITMAPINFO *bi; |
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CAPTUREPARMS cparms; |
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DWORD biCompression; |
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WORD biBitCount; |
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int width;
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int height;
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int ret;
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if(!ap->time_base.den) {
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av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
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return AVERROR(EIO);
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} |
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ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0); |
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if(!ctx->hwnd) {
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av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
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return AVERROR(EIO);
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} |
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/* If atoi fails, devnum==0 and the default device is used */
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devnum = atoi(s->filename); |
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ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
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if(!ret) {
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av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
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DestroyWindow(ctx->hwnd); |
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return AVERROR(ENODEV);
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} |
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SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0); |
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SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0); |
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ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
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(LPARAM) videostream_cb); |
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if(!ret) {
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av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
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goto fail_io;
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} |
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SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s); |
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st = av_new_stream(s, 0);
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if(!st) {
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vfw_read_close(s); |
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return AVERROR(ENOMEM);
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} |
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/* Set video format */
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bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0); |
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if(!bisize)
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goto fail_io;
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bi = av_malloc(bisize); |
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if(!bi) {
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vfw_read_close(s); |
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return AVERROR(ENOMEM);
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} |
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ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi); |
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if(!ret)
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goto fail_bi;
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dump_bih(s, &bi->bmiHeader); |
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width = ap->width ? ap->width : bi->bmiHeader.biWidth ; |
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height = ap->height ? ap->height : bi->bmiHeader.biHeight; |
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bi->bmiHeader.biWidth = width ; |
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bi->bmiHeader.biHeight = height; |
309 |
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if (0) { |
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/* For testing yet unsupported compressions
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* Copy these values from user-supplied verbose information */
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bi->bmiHeader.biWidth = 320;
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bi->bmiHeader.biHeight = 240;
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bi->bmiHeader.biPlanes = 1;
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bi->bmiHeader.biBitCount = 12;
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bi->bmiHeader.biCompression = MKTAG('I','4','2','0'); |
318 |
bi->bmiHeader.biSizeImage = 115200;
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dump_bih(s, &bi->bmiHeader); |
320 |
} |
321 |
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ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi); |
323 |
if(!ret) {
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av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
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goto fail_bi;
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} |
327 |
|
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biCompression = bi->bmiHeader.biCompression; |
329 |
biBitCount = bi->bmiHeader.biBitCount; |
330 |
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av_free(bi); |
332 |
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/* Set sequence setup */
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ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
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(LPARAM) &cparms); |
336 |
if(!ret)
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goto fail_io;
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338 |
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dump_captureparms(s, &cparms); |
340 |
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cparms.fYield = 1; // Spawn a background thread |
342 |
cparms.dwRequestMicroSecPerFrame = |
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(ap->time_base.num*1000000) / ap->time_base.den;
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cparms.fAbortLeftMouse = 0;
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cparms.fAbortRightMouse = 0;
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cparms.fCaptureAudio = 0;
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cparms.vKeyAbort = 0;
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348 |
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ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
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(LPARAM) &cparms); |
351 |
if(!ret)
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goto fail_io;
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353 |
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codec = st->codec; |
355 |
codec->time_base = ap->time_base; |
356 |
codec->codec_type = AVMEDIA_TYPE_VIDEO; |
357 |
codec->width = width; |
358 |
codec->height = height; |
359 |
codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount); |
360 |
if(codec->pix_fmt == PIX_FMT_NONE) {
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codec->codec_id = vfw_codecid(biCompression); |
362 |
if(codec->codec_id == CODEC_ID_NONE) {
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av_log(s, AV_LOG_ERROR, "Unknown compression type. "
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364 |
"Please report verbose (-v 9) debug information.\n");
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365 |
vfw_read_close(s); |
366 |
return AVERROR_PATCHWELCOME;
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} |
368 |
codec->bits_per_coded_sample = biBitCount; |
369 |
} else {
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370 |
codec->codec_id = CODEC_ID_RAWVIDEO; |
371 |
if(biCompression == BI_RGB)
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codec->bits_per_coded_sample = biBitCount; |
373 |
} |
374 |
|
375 |
av_set_pts_info(st, 32, 1, 1000); |
376 |
|
377 |
ctx->mutex = CreateMutex(NULL, 0, NULL); |
378 |
if(!ctx->mutex) {
|
379 |
av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
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380 |
goto fail_io;
|
381 |
} |
382 |
ctx->event = CreateEvent(NULL, 1, 0, NULL); |
383 |
if(!ctx->event) {
|
384 |
av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
|
385 |
goto fail_io;
|
386 |
} |
387 |
|
388 |
ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0); |
389 |
if(!ret) {
|
390 |
av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
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391 |
goto fail_io;
|
392 |
} |
393 |
|
394 |
return 0; |
395 |
|
396 |
fail_bi:
|
397 |
av_free(bi); |
398 |
|
399 |
fail_io:
|
400 |
vfw_read_close(s); |
401 |
return AVERROR(EIO);
|
402 |
} |
403 |
|
404 |
static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt) |
405 |
{ |
406 |
struct vfw_ctx *ctx = s->priv_data;
|
407 |
AVPacketList *pktl = NULL;
|
408 |
|
409 |
while(!pktl) {
|
410 |
WaitForSingleObject(ctx->mutex, INFINITE); |
411 |
pktl = ctx->pktl; |
412 |
if(ctx->pktl) {
|
413 |
*pkt = ctx->pktl->pkt; |
414 |
ctx->pktl = ctx->pktl->next; |
415 |
av_free(pktl); |
416 |
} |
417 |
ResetEvent(ctx->event); |
418 |
ReleaseMutex(ctx->mutex); |
419 |
if(!pktl) {
|
420 |
if(s->flags & AVFMT_FLAG_NONBLOCK) {
|
421 |
return AVERROR(EAGAIN);
|
422 |
} else {
|
423 |
WaitForSingleObject(ctx->event, INFINITE); |
424 |
} |
425 |
} |
426 |
} |
427 |
|
428 |
ctx->curbufsize -= pkt->size; |
429 |
|
430 |
return pkt->size;
|
431 |
} |
432 |
|
433 |
AVInputFormat vfwcap_demuxer = { |
434 |
"vfwcap",
|
435 |
NULL_IF_CONFIG_SMALL("VFW video capture"),
|
436 |
sizeof(struct vfw_ctx), |
437 |
NULL,
|
438 |
vfw_read_header, |
439 |
vfw_read_packet, |
440 |
vfw_read_close, |
441 |
.flags = AVFMT_NOFILE, |
442 |
}; |