mirror of https://git.ffmpeg.org/ffmpeg.git
419 lines
12 KiB
C
419 lines
12 KiB
C
/*
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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 <vfw.h>
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#include <windows.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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AVFormatContext *s;
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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('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 -1;
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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(struct vfw_ctx *ctx)
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{
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AVFormatContext *s = ctx->s;
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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(ctx->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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struct vfw_ctx *ctx;
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AVPacketList **ppktl, *pktl_next;
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ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
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dump_videohdr(ctx->s, vdhdr);
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if(shall_we_drop(ctx))
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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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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_IO;
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}
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ctx->s = s;
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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_IO;
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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) ctx);
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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_NOMEM;
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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_NOMEM;
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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;
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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');
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bi->bmiHeader.biSizeImage = 115200;
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dump_bih(s, &bi->bmiHeader);
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#endif
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ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
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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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}
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biCompression = bi->bmiHeader.biCompression;
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biBitCount = bi->bmiHeader.biBitCount;
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av_free(bi);
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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);
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if(!ret)
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goto fail_io;
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dump_captureparms(s, &cparms);
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cparms.fYield = 1; // Spawn a background thread
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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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ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
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(LPARAM) &cparms);
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if(!ret)
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goto fail_io;
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codec = st->codec;
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codec->time_base = ap->time_base;
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codec->codec_type = CODEC_TYPE_VIDEO;
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codec->width = width;
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codec->height = height;
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codec->codec_id = CODEC_ID_RAWVIDEO;
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codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
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if(biCompression == BI_RGB)
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codec->bits_per_coded_sample = biBitCount;
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av_set_pts_info(st, 32, 1, 1000);
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if(codec->pix_fmt == -1) {
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av_log(s, AV_LOG_ERROR, "Unknown compression type."
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"Please report verbose (-v 99) debug information.\n");
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vfw_read_close(s);
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return AVERROR_PATCHWELCOME;
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}
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ctx->mutex = CreateMutex(NULL, 0, NULL);
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if(!ctx->mutex) {
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av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
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goto fail_io;
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}
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ctx->event = CreateEvent(NULL, 1, 0, NULL);
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if(!ctx->event) {
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av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
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goto fail_io;
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}
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ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
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if(!ret) {
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av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
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goto fail_io;
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}
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return 0;
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fail_bi:
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av_free(bi);
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fail_io:
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vfw_read_close(s);
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return AVERROR_IO;
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}
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static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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struct vfw_ctx *ctx = s->priv_data;
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AVPacketList *pktl = NULL;
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while(!pktl) {
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WaitForSingleObject(ctx->mutex, INFINITE);
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pktl = ctx->pktl;
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if(ctx->pktl) {
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*pkt = ctx->pktl->pkt;
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ctx->pktl = ctx->pktl->next;
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av_free(pktl);
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}
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ResetEvent(ctx->event);
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ReleaseMutex(ctx->mutex);
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if(!pktl) {
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if(s->flags & AVFMT_FLAG_NONBLOCK) {
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return AVERROR(EAGAIN);
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} else {
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WaitForSingleObject(ctx->event, INFINITE);
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}
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}
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}
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ctx->curbufsize -= pkt->size;
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return pkt->size;
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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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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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return 0;
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}
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AVInputFormat vfwcap_demuxer = {
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"vfwcap",
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NULL_IF_CONFIG_SMALL("VFW video capture"),
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sizeof(struct vfw_ctx),
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NULL,
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vfw_read_header,
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vfw_read_packet,
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vfw_read_close,
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.flags = AVFMT_NOFILE,
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};
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