yading@10: /*
yading@10:  * VFW capture interface
yading@10:  * Copyright (c) 2006-2008 Ramiro Polla
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavformat/internal.h"
yading@10: #include "libavutil/log.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/parseutils.h"
yading@10: #include <windows.h>
yading@10: #include <vfw.h>
yading@10: #include "avdevice.h"
yading@10: 
yading@10: /* Defines for VFW missing from MinGW.
yading@10:  * Remove this when MinGW incorporates them. */
yading@10: #define HWND_MESSAGE                ((HWND)-3)
yading@10: 
yading@10: /* End of missing MinGW defines */
yading@10: 
yading@10: struct vfw_ctx {
yading@10:     const AVClass *class;
yading@10:     HWND hwnd;
yading@10:     HANDLE mutex;
yading@10:     HANDLE event;
yading@10:     AVPacketList *pktl;
yading@10:     unsigned int curbufsize;
yading@10:     unsigned int frame_num;
yading@10:     char *video_size;       /**< A string describing video size, set by a private option. */
yading@10:     char *framerate;        /**< Set by a private option. */
yading@10: };
yading@10: 
yading@10: static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
yading@10: {
yading@10:     switch(biCompression) {
yading@10:     case MKTAG('U', 'Y', 'V', 'Y'):
yading@10:         return AV_PIX_FMT_UYVY422;
yading@10:     case MKTAG('Y', 'U', 'Y', '2'):
yading@10:         return AV_PIX_FMT_YUYV422;
yading@10:     case MKTAG('I', '4', '2', '0'):
yading@10:         return AV_PIX_FMT_YUV420P;
yading@10:     case BI_RGB:
yading@10:         switch(biBitCount) { /* 1-8 are untested */
yading@10:             case 1:
yading@10:                 return AV_PIX_FMT_MONOWHITE;
yading@10:             case 4:
yading@10:                 return AV_PIX_FMT_RGB4;
yading@10:             case 8:
yading@10:                 return AV_PIX_FMT_RGB8;
yading@10:             case 16:
yading@10:                 return AV_PIX_FMT_RGB555;
yading@10:             case 24:
yading@10:                 return AV_PIX_FMT_BGR24;
yading@10:             case 32:
yading@10:                 return AV_PIX_FMT_RGB32;
yading@10:         }
yading@10:     }
yading@10:     return AV_PIX_FMT_NONE;
yading@10: }
yading@10: 
yading@10: static enum AVCodecID vfw_codecid(DWORD biCompression)
yading@10: {
yading@10:     switch(biCompression) {
yading@10:     case MKTAG('d', 'v', 's', 'd'):
yading@10:         return AV_CODEC_ID_DVVIDEO;
yading@10:     case MKTAG('M', 'J', 'P', 'G'):
yading@10:     case MKTAG('m', 'j', 'p', 'g'):
yading@10:         return AV_CODEC_ID_MJPEG;
yading@10:     }
yading@10:     return AV_CODEC_ID_NONE;
yading@10: }
yading@10: 
yading@10: #define dstruct(pctx, sname, var, type) \
yading@10:     av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
yading@10: 
yading@10: static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
yading@10: {
yading@10:     av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
yading@10:     dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
yading@10:     dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
yading@10:     dstruct(s, cparms, wPercentDropForError, "u");
yading@10:     dstruct(s, cparms, fYield, "d");
yading@10:     dstruct(s, cparms, dwIndexSize, "lu");
yading@10:     dstruct(s, cparms, wChunkGranularity, "u");
yading@10:     dstruct(s, cparms, fUsingDOSMemory, "d");
yading@10:     dstruct(s, cparms, wNumVideoRequested, "u");
yading@10:     dstruct(s, cparms, fCaptureAudio, "d");
yading@10:     dstruct(s, cparms, wNumAudioRequested, "u");
yading@10:     dstruct(s, cparms, vKeyAbort, "u");
yading@10:     dstruct(s, cparms, fAbortLeftMouse, "d");
yading@10:     dstruct(s, cparms, fAbortRightMouse, "d");
yading@10:     dstruct(s, cparms, fLimitEnabled, "d");
yading@10:     dstruct(s, cparms, wTimeLimit, "u");
yading@10:     dstruct(s, cparms, fMCIControl, "d");
yading@10:     dstruct(s, cparms, fStepMCIDevice, "d");
yading@10:     dstruct(s, cparms, dwMCIStartTime, "lu");
yading@10:     dstruct(s, cparms, dwMCIStopTime, "lu");
yading@10:     dstruct(s, cparms, fStepCaptureAt2x, "d");
yading@10:     dstruct(s, cparms, wStepCaptureAverageFrames, "u");
yading@10:     dstruct(s, cparms, dwAudioBufferSize, "lu");
yading@10:     dstruct(s, cparms, fDisableWriteCache, "d");
yading@10:     dstruct(s, cparms, AVStreamMaster, "u");
yading@10: }
yading@10: 
yading@10: static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
yading@10: {
yading@10: #ifdef DEBUG
yading@10:     av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
yading@10:     dstruct(s, vhdr, lpData, "p");
yading@10:     dstruct(s, vhdr, dwBufferLength, "lu");
yading@10:     dstruct(s, vhdr, dwBytesUsed, "lu");
yading@10:     dstruct(s, vhdr, dwTimeCaptured, "lu");
yading@10:     dstruct(s, vhdr, dwUser, "lu");
yading@10:     dstruct(s, vhdr, dwFlags, "lu");
yading@10:     dstruct(s, vhdr, dwReserved[0], "lu");
yading@10:     dstruct(s, vhdr, dwReserved[1], "lu");
yading@10:     dstruct(s, vhdr, dwReserved[2], "lu");
yading@10:     dstruct(s, vhdr, dwReserved[3], "lu");
yading@10: #endif
yading@10: }
yading@10: 
yading@10: static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
yading@10: {
yading@10:     av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
yading@10:     dstruct(s, bih, biSize, "lu");
yading@10:     dstruct(s, bih, biWidth, "ld");
yading@10:     dstruct(s, bih, biHeight, "ld");
yading@10:     dstruct(s, bih, biPlanes, "d");
yading@10:     dstruct(s, bih, biBitCount, "d");
yading@10:     dstruct(s, bih, biCompression, "lu");
yading@10:     av_log(s, AV_LOG_DEBUG, "    biCompression:\t\"%.4s\"\n",
yading@10:                    (char*) &bih->biCompression);
yading@10:     dstruct(s, bih, biSizeImage, "lu");
yading@10:     dstruct(s, bih, biXPelsPerMeter, "lu");
yading@10:     dstruct(s, bih, biYPelsPerMeter, "lu");
yading@10:     dstruct(s, bih, biClrUsed, "lu");
yading@10:     dstruct(s, bih, biClrImportant, "lu");
yading@10: }
yading@10: 
yading@10: static int shall_we_drop(AVFormatContext *s)
yading@10: {
yading@10:     struct vfw_ctx *ctx = s->priv_data;
yading@10:     const uint8_t dropscore[] = {62, 75, 87, 100};
yading@10:     const int ndropscores = FF_ARRAY_ELEMS(dropscore);
yading@10:     unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
yading@10: 
yading@10:     if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
yading@10:         av_log(s, AV_LOG_ERROR,
yading@10:               "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
yading@10:         return 1;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
yading@10: {
yading@10:     AVFormatContext *s;
yading@10:     struct vfw_ctx *ctx;
yading@10:     AVPacketList **ppktl, *pktl_next;
yading@10: 
yading@10:     s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
yading@10:     ctx = s->priv_data;
yading@10: 
yading@10:     dump_videohdr(s, vdhdr);
yading@10: 
yading@10:     if(shall_we_drop(s))
yading@10:         return FALSE;
yading@10: 
yading@10:     WaitForSingleObject(ctx->mutex, INFINITE);
yading@10: 
yading@10:     pktl_next = av_mallocz(sizeof(AVPacketList));
yading@10:     if(!pktl_next)
yading@10:         goto fail;
yading@10: 
yading@10:     if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
yading@10:         av_free(pktl_next);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
yading@10:     memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
yading@10: 
yading@10:     for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
yading@10:     *ppktl = pktl_next;
yading@10: 
yading@10:     ctx->curbufsize += vdhdr->dwBytesUsed;
yading@10: 
yading@10:     SetEvent(ctx->event);
yading@10:     ReleaseMutex(ctx->mutex);
yading@10: 
yading@10:     return TRUE;
yading@10: fail:
yading@10:     ReleaseMutex(ctx->mutex);
yading@10:     return FALSE;
yading@10: }
yading@10: 
yading@10: static int vfw_read_close(AVFormatContext *s)
yading@10: {
yading@10:     struct vfw_ctx *ctx = s->priv_data;
yading@10:     AVPacketList *pktl;
yading@10: 
yading@10:     if(ctx->hwnd) {
yading@10:         SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
yading@10:         SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
yading@10:         DestroyWindow(ctx->hwnd);
yading@10:     }
yading@10:     if(ctx->mutex)
yading@10:         CloseHandle(ctx->mutex);
yading@10:     if(ctx->event)
yading@10:         CloseHandle(ctx->event);
yading@10: 
yading@10:     pktl = ctx->pktl;
yading@10:     while (pktl) {
yading@10:         AVPacketList *next = pktl->next;
yading@10:         av_destruct_packet(&pktl->pkt);
yading@10:         av_free(pktl);
yading@10:         pktl = next;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int vfw_read_header(AVFormatContext *s)
yading@10: {
yading@10:     struct vfw_ctx *ctx = s->priv_data;
yading@10:     AVCodecContext *codec;
yading@10:     AVStream *st;
yading@10:     int devnum;
yading@10:     int bisize;
yading@10:     BITMAPINFO *bi = NULL;
yading@10:     CAPTUREPARMS cparms;
yading@10:     DWORD biCompression;
yading@10:     WORD biBitCount;
yading@10:     int ret;
yading@10:     AVRational framerate_q;
yading@10: 
yading@10:     if (!strcmp(s->filename, "list")) {
yading@10:         for (devnum = 0; devnum <= 9; devnum++) {
yading@10:             char driver_name[256];
yading@10:             char driver_ver[256];
yading@10:             ret = capGetDriverDescription(devnum,
yading@10:                                           driver_name, sizeof(driver_name),
yading@10:                                           driver_ver, sizeof(driver_ver));
yading@10:             if (ret) {
yading@10:                 av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
yading@10:                 av_log(s, AV_LOG_INFO, " %s\n", driver_name);
yading@10:                 av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
yading@10:             }
yading@10:         }
yading@10:         return AVERROR(EIO);
yading@10:     }
yading@10: 
yading@10:     ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
yading@10:     if(!ctx->hwnd) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
yading@10:         return AVERROR(EIO);
yading@10:     }
yading@10: 
yading@10:     /* If atoi fails, devnum==0 and the default device is used */
yading@10:     devnum = atoi(s->filename);
yading@10: 
yading@10:     ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
yading@10:     if(!ret) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
yading@10:         DestroyWindow(ctx->hwnd);
yading@10:         return AVERROR(ENODEV);
yading@10:     }
yading@10: 
yading@10:     SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
yading@10:     SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
yading@10: 
yading@10:     ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
yading@10:                       (LPARAM) videostream_cb);
yading@10:     if(!ret) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
yading@10: 
yading@10:     st = avformat_new_stream(s, NULL);
yading@10:     if(!st) {
yading@10:         vfw_read_close(s);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10: 
yading@10:     /* Set video format */
yading@10:     bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
yading@10:     if(!bisize)
yading@10:         goto fail;
yading@10:     bi = av_malloc(bisize);
yading@10:     if(!bi) {
yading@10:         vfw_read_close(s);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10:     ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
yading@10:     if(!ret)
yading@10:         goto fail;
yading@10: 
yading@10:     dump_bih(s, &bi->bmiHeader);
yading@10: 
yading@10:     ret = av_parse_video_rate(&framerate_q, ctx->framerate);
yading@10:     if (ret < 0) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     if (ctx->video_size) {
yading@10:         ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size);
yading@10:         if (ret < 0) {
yading@10:             av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
yading@10:             goto fail;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (0) {
yading@10:         /* For testing yet unsupported compressions
yading@10:          * Copy these values from user-supplied verbose information */
yading@10:         bi->bmiHeader.biWidth       = 320;
yading@10:         bi->bmiHeader.biHeight      = 240;
yading@10:         bi->bmiHeader.biPlanes      = 1;
yading@10:         bi->bmiHeader.biBitCount    = 12;
yading@10:         bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
yading@10:         bi->bmiHeader.biSizeImage   = 115200;
yading@10:         dump_bih(s, &bi->bmiHeader);
yading@10:     }
yading@10: 
yading@10:     ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
yading@10:     if(!ret) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     biCompression = bi->bmiHeader.biCompression;
yading@10:     biBitCount = bi->bmiHeader.biBitCount;
yading@10: 
yading@10:     /* Set sequence setup */
yading@10:     ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
yading@10:                       (LPARAM) &cparms);
yading@10:     if(!ret)
yading@10:         goto fail;
yading@10: 
yading@10:     dump_captureparms(s, &cparms);
yading@10: 
yading@10:     cparms.fYield = 1; // Spawn a background thread
yading@10:     cparms.dwRequestMicroSecPerFrame =
yading@10:                                (framerate_q.den*1000000) / framerate_q.num;
yading@10:     cparms.fAbortLeftMouse = 0;
yading@10:     cparms.fAbortRightMouse = 0;
yading@10:     cparms.fCaptureAudio = 0;
yading@10:     cparms.vKeyAbort = 0;
yading@10: 
yading@10:     ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
yading@10:                       (LPARAM) &cparms);
yading@10:     if(!ret)
yading@10:         goto fail;
yading@10: 
yading@10:     codec = st->codec;
yading@10:     codec->time_base = av_inv_q(framerate_q);
yading@10:     codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@10:     codec->width  = bi->bmiHeader.biWidth;
yading@10:     codec->height = bi->bmiHeader.biHeight;
yading@10:     codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
yading@10:     if(codec->pix_fmt == AV_PIX_FMT_NONE) {
yading@10:         codec->codec_id = vfw_codecid(biCompression);
yading@10:         if(codec->codec_id == AV_CODEC_ID_NONE) {
yading@10:             av_log(s, AV_LOG_ERROR, "Unknown compression type. "
yading@10:                              "Please report verbose (-v 9) debug information.\n");
yading@10:             vfw_read_close(s);
yading@10:             return AVERROR_PATCHWELCOME;
yading@10:         }
yading@10:         codec->bits_per_coded_sample = biBitCount;
yading@10:     } else {
yading@10:         codec->codec_id = AV_CODEC_ID_RAWVIDEO;
yading@10:         if(biCompression == BI_RGB) {
yading@10:             codec->bits_per_coded_sample = biBitCount;
yading@10:             codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:             if (codec->extradata) {
yading@10:                 codec->extradata_size = 9;
yading@10:                 memcpy(codec->extradata, "BottomUp", 9);
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     av_freep(&bi);
yading@10: 
yading@10:     avpriv_set_pts_info(st, 32, 1, 1000);
yading@10: 
yading@10:     ctx->mutex = CreateMutex(NULL, 0, NULL);
yading@10:     if(!ctx->mutex) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
yading@10:         goto fail;
yading@10:     }
yading@10:     ctx->event = CreateEvent(NULL, 1, 0, NULL);
yading@10:     if(!ctx->event) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
yading@10:     if(!ret) {
yading@10:         av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: 
yading@10: fail:
yading@10:     av_freep(&bi);
yading@10:     vfw_read_close(s);
yading@10:     return AVERROR(EIO);
yading@10: }
yading@10: 
yading@10: static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@10: {
yading@10:     struct vfw_ctx *ctx = s->priv_data;
yading@10:     AVPacketList *pktl = NULL;
yading@10: 
yading@10:     while(!pktl) {
yading@10:         WaitForSingleObject(ctx->mutex, INFINITE);
yading@10:         pktl = ctx->pktl;
yading@10:         if(ctx->pktl) {
yading@10:             *pkt = ctx->pktl->pkt;
yading@10:             ctx->pktl = ctx->pktl->next;
yading@10:             av_free(pktl);
yading@10:         }
yading@10:         ResetEvent(ctx->event);
yading@10:         ReleaseMutex(ctx->mutex);
yading@10:         if(!pktl) {
yading@10:             if(s->flags & AVFMT_FLAG_NONBLOCK) {
yading@10:                 return AVERROR(EAGAIN);
yading@10:             } else {
yading@10:                 WaitForSingleObject(ctx->event, INFINITE);
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     ctx->curbufsize -= pkt->size;
yading@10: 
yading@10:     return pkt->size;
yading@10: }
yading@10: 
yading@10: #define OFFSET(x) offsetof(struct vfw_ctx, x)
yading@10: #define DEC AV_OPT_FLAG_DECODING_PARAM
yading@10: static const AVOption options[] = {
yading@10:     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
yading@10:     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
yading@10:     { NULL },
yading@10: };
yading@10: 
yading@10: static const AVClass vfw_class = {
yading@10:     .class_name = "VFW indev",
yading@10:     .item_name  = av_default_item_name,
yading@10:     .option     = options,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10: };
yading@10: 
yading@10: AVInputFormat ff_vfwcap_demuxer = {
yading@10:     .name           = "vfwcap",
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("VfW video capture"),
yading@10:     .priv_data_size = sizeof(struct vfw_ctx),
yading@10:     .read_header    = vfw_read_header,
yading@10:     .read_packet    = vfw_read_packet,
yading@10:     .read_close     = vfw_read_close,
yading@10:     .flags          = AVFMT_NOFILE,
yading@10:     .priv_class     = &vfw_class,
yading@10: };