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  1. /*
  2.  * VFW capture interface
  3.  * Copyright (c) 2006-2008 Ramiro Polla
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavformat/internal.h"
  23. #include "libavutil/log.h"
  24. #include "libavutil/opt.h"
  25. #include "libavutil/parseutils.h"
  26. #include <windows.h>
  27. #include <vfw.h>
  28. #include "avdevice.h"
  29.  
  30. /* Defines for VFW missing from MinGW.
  31.  * Remove this when MinGW incorporates them. */
  32. #define HWND_MESSAGE                ((HWND)-3)
  33.  
  34. /* End of missing MinGW defines */
  35.  
  36. struct vfw_ctx {
  37.     const AVClass *class;
  38.     HWND hwnd;
  39.     HANDLE mutex;
  40.     HANDLE event;
  41.     AVPacketList *pktl;
  42.     unsigned int curbufsize;
  43.     unsigned int frame_num;
  44.     char *video_size;       /**< A string describing video size, set by a private option. */
  45.     char *framerate;        /**< Set by a private option. */
  46. };
  47.  
  48. static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
  49. {
  50.     switch(biCompression) {
  51.     case MKTAG('U', 'Y', 'V', 'Y'):
  52.         return AV_PIX_FMT_UYVY422;
  53.     case MKTAG('Y', 'U', 'Y', '2'):
  54.         return AV_PIX_FMT_YUYV422;
  55.     case MKTAG('I', '4', '2', '0'):
  56.         return AV_PIX_FMT_YUV420P;
  57.     case BI_RGB:
  58.         switch(biBitCount) { /* 1-8 are untested */
  59.             case 1:
  60.                 return AV_PIX_FMT_MONOWHITE;
  61.             case 4:
  62.                 return AV_PIX_FMT_RGB4;
  63.             case 8:
  64.                 return AV_PIX_FMT_RGB8;
  65.             case 16:
  66.                 return AV_PIX_FMT_RGB555;
  67.             case 24:
  68.                 return AV_PIX_FMT_BGR24;
  69.             case 32:
  70.                 return AV_PIX_FMT_RGB32;
  71.         }
  72.     }
  73.     return AV_PIX_FMT_NONE;
  74. }
  75.  
  76. static enum AVCodecID vfw_codecid(DWORD biCompression)
  77. {
  78.     switch(biCompression) {
  79.     case MKTAG('d', 'v', 's', 'd'):
  80.         return AV_CODEC_ID_DVVIDEO;
  81.     case MKTAG('M', 'J', 'P', 'G'):
  82.     case MKTAG('m', 'j', 'p', 'g'):
  83.         return AV_CODEC_ID_MJPEG;
  84.     }
  85.     return AV_CODEC_ID_NONE;
  86. }
  87.  
  88. #define dstruct(pctx, sname, var, type) \
  89.     av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
  90.  
  91. static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
  92. {
  93.     av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
  94.     dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
  95.     dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
  96.     dstruct(s, cparms, wPercentDropForError, "u");
  97.     dstruct(s, cparms, fYield, "d");
  98.     dstruct(s, cparms, dwIndexSize, "lu");
  99.     dstruct(s, cparms, wChunkGranularity, "u");
  100.     dstruct(s, cparms, fUsingDOSMemory, "d");
  101.     dstruct(s, cparms, wNumVideoRequested, "u");
  102.     dstruct(s, cparms, fCaptureAudio, "d");
  103.     dstruct(s, cparms, wNumAudioRequested, "u");
  104.     dstruct(s, cparms, vKeyAbort, "u");
  105.     dstruct(s, cparms, fAbortLeftMouse, "d");
  106.     dstruct(s, cparms, fAbortRightMouse, "d");
  107.     dstruct(s, cparms, fLimitEnabled, "d");
  108.     dstruct(s, cparms, wTimeLimit, "u");
  109.     dstruct(s, cparms, fMCIControl, "d");
  110.     dstruct(s, cparms, fStepMCIDevice, "d");
  111.     dstruct(s, cparms, dwMCIStartTime, "lu");
  112.     dstruct(s, cparms, dwMCIStopTime, "lu");
  113.     dstruct(s, cparms, fStepCaptureAt2x, "d");
  114.     dstruct(s, cparms, wStepCaptureAverageFrames, "u");
  115.     dstruct(s, cparms, dwAudioBufferSize, "lu");
  116.     dstruct(s, cparms, fDisableWriteCache, "d");
  117.     dstruct(s, cparms, AVStreamMaster, "u");
  118. }
  119.  
  120. static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
  121. {
  122. #ifdef DEBUG
  123.     av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
  124.     dstruct(s, vhdr, lpData, "p");
  125.     dstruct(s, vhdr, dwBufferLength, "lu");
  126.     dstruct(s, vhdr, dwBytesUsed, "lu");
  127.     dstruct(s, vhdr, dwTimeCaptured, "lu");
  128.     dstruct(s, vhdr, dwUser, "lu");
  129.     dstruct(s, vhdr, dwFlags, "lu");
  130.     dstruct(s, vhdr, dwReserved[0], "lu");
  131.     dstruct(s, vhdr, dwReserved[1], "lu");
  132.     dstruct(s, vhdr, dwReserved[2], "lu");
  133.     dstruct(s, vhdr, dwReserved[3], "lu");
  134. #endif
  135. }
  136.  
  137. static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
  138. {
  139.     av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
  140.     dstruct(s, bih, biSize, "lu");
  141.     dstruct(s, bih, biWidth, "ld");
  142.     dstruct(s, bih, biHeight, "ld");
  143.     dstruct(s, bih, biPlanes, "d");
  144.     dstruct(s, bih, biBitCount, "d");
  145.     dstruct(s, bih, biCompression, "lu");
  146.     av_log(s, AV_LOG_DEBUG, "    biCompression:\t\"%.4s\"\n",
  147.                    (char*) &bih->biCompression);
  148.     dstruct(s, bih, biSizeImage, "lu");
  149.     dstruct(s, bih, biXPelsPerMeter, "lu");
  150.     dstruct(s, bih, biYPelsPerMeter, "lu");
  151.     dstruct(s, bih, biClrUsed, "lu");
  152.     dstruct(s, bih, biClrImportant, "lu");
  153. }
  154.  
  155. static int shall_we_drop(AVFormatContext *s)
  156. {
  157.     struct vfw_ctx *ctx = s->priv_data;
  158.     static const uint8_t dropscore[] = {62, 75, 87, 100};
  159.     const int ndropscores = FF_ARRAY_ELEMS(dropscore);
  160.     unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
  161.  
  162.     if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
  163.         av_log(s, AV_LOG_ERROR,
  164.               "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
  165.         return 1;
  166.     }
  167.  
  168.     return 0;
  169. }
  170.  
  171. static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
  172. {
  173.     AVFormatContext *s;
  174.     struct vfw_ctx *ctx;
  175.     AVPacketList **ppktl, *pktl_next;
  176.  
  177.     s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
  178.     ctx = s->priv_data;
  179.  
  180.     dump_videohdr(s, vdhdr);
  181.  
  182.     if(shall_we_drop(s))
  183.         return FALSE;
  184.  
  185.     WaitForSingleObject(ctx->mutex, INFINITE);
  186.  
  187.     pktl_next = av_mallocz(sizeof(AVPacketList));
  188.     if(!pktl_next)
  189.         goto fail;
  190.  
  191.     if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
  192.         av_free(pktl_next);
  193.         goto fail;
  194.     }
  195.  
  196.     pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
  197.     memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
  198.  
  199.     for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
  200.     *ppktl = pktl_next;
  201.  
  202.     ctx->curbufsize += vdhdr->dwBytesUsed;
  203.  
  204.     SetEvent(ctx->event);
  205.     ReleaseMutex(ctx->mutex);
  206.  
  207.     return TRUE;
  208. fail:
  209.     ReleaseMutex(ctx->mutex);
  210.     return FALSE;
  211. }
  212.  
  213. static int vfw_read_close(AVFormatContext *s)
  214. {
  215.     struct vfw_ctx *ctx = s->priv_data;
  216.     AVPacketList *pktl;
  217.  
  218.     if(ctx->hwnd) {
  219.         SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
  220.         SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
  221.         DestroyWindow(ctx->hwnd);
  222.     }
  223.     if(ctx->mutex)
  224.         CloseHandle(ctx->mutex);
  225.     if(ctx->event)
  226.         CloseHandle(ctx->event);
  227.  
  228.     pktl = ctx->pktl;
  229.     while (pktl) {
  230.         AVPacketList *next = pktl->next;
  231.         av_destruct_packet(&pktl->pkt);
  232.         av_free(pktl);
  233.         pktl = next;
  234.     }
  235.  
  236.     return 0;
  237. }
  238.  
  239. static int vfw_read_header(AVFormatContext *s)
  240. {
  241.     struct vfw_ctx *ctx = s->priv_data;
  242.     AVCodecContext *codec;
  243.     AVStream *st;
  244.     int devnum;
  245.     int bisize;
  246.     BITMAPINFO *bi = NULL;
  247.     CAPTUREPARMS cparms;
  248.     DWORD biCompression;
  249.     WORD biBitCount;
  250.     int ret;
  251.     AVRational framerate_q;
  252.  
  253.     if (!strcmp(s->filename, "list")) {
  254.         for (devnum = 0; devnum <= 9; devnum++) {
  255.             char driver_name[256];
  256.             char driver_ver[256];
  257.             ret = capGetDriverDescription(devnum,
  258.                                           driver_name, sizeof(driver_name),
  259.                                           driver_ver, sizeof(driver_ver));
  260.             if (ret) {
  261.                 av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
  262.                 av_log(s, AV_LOG_INFO, " %s\n", driver_name);
  263.                 av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
  264.             }
  265.         }
  266.         return AVERROR(EIO);
  267.     }
  268.  
  269.     ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
  270.     if(!ctx->hwnd) {
  271.         av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
  272.         return AVERROR(EIO);
  273.     }
  274.  
  275.     /* If atoi fails, devnum==0 and the default device is used */
  276.     devnum = atoi(s->filename);
  277.  
  278.     ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
  279.     if(!ret) {
  280.         av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
  281.         DestroyWindow(ctx->hwnd);
  282.         return AVERROR(ENODEV);
  283.     }
  284.  
  285.     SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
  286.     SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
  287.  
  288.     ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
  289.                       (LPARAM) videostream_cb);
  290.     if(!ret) {
  291.         av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
  292.         goto fail;
  293.     }
  294.  
  295.     SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
  296.  
  297.     st = avformat_new_stream(s, NULL);
  298.     if(!st) {
  299.         vfw_read_close(s);
  300.         return AVERROR(ENOMEM);
  301.     }
  302.  
  303.     /* Set video format */
  304.     bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
  305.     if(!bisize)
  306.         goto fail;
  307.     bi = av_malloc(bisize);
  308.     if(!bi) {
  309.         vfw_read_close(s);
  310.         return AVERROR(ENOMEM);
  311.     }
  312.     ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
  313.     if(!ret)
  314.         goto fail;
  315.  
  316.     dump_bih(s, &bi->bmiHeader);
  317.  
  318.     ret = av_parse_video_rate(&framerate_q, ctx->framerate);
  319.     if (ret < 0) {
  320.         av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
  321.         goto fail;
  322.     }
  323.  
  324.     if (ctx->video_size) {
  325.         ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size);
  326.         if (ret < 0) {
  327.             av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
  328.             goto fail;
  329.         }
  330.     }
  331.  
  332.     if (0) {
  333.         /* For testing yet unsupported compressions
  334.          * Copy these values from user-supplied verbose information */
  335.         bi->bmiHeader.biWidth       = 320;
  336.         bi->bmiHeader.biHeight      = 240;
  337.         bi->bmiHeader.biPlanes      = 1;
  338.         bi->bmiHeader.biBitCount    = 12;
  339.         bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
  340.         bi->bmiHeader.biSizeImage   = 115200;
  341.         dump_bih(s, &bi->bmiHeader);
  342.     }
  343.  
  344.     ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
  345.     if(!ret) {
  346.         av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
  347.         goto fail;
  348.     }
  349.  
  350.     biCompression = bi->bmiHeader.biCompression;
  351.     biBitCount = bi->bmiHeader.biBitCount;
  352.  
  353.     /* Set sequence setup */
  354.     ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
  355.                       (LPARAM) &cparms);
  356.     if(!ret)
  357.         goto fail;
  358.  
  359.     dump_captureparms(s, &cparms);
  360.  
  361.     cparms.fYield = 1; // Spawn a background thread
  362.     cparms.dwRequestMicroSecPerFrame =
  363.                                (framerate_q.den*1000000) / framerate_q.num;
  364.     cparms.fAbortLeftMouse = 0;
  365.     cparms.fAbortRightMouse = 0;
  366.     cparms.fCaptureAudio = 0;
  367.     cparms.vKeyAbort = 0;
  368.  
  369.     ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
  370.                       (LPARAM) &cparms);
  371.     if(!ret)
  372.         goto fail;
  373.  
  374.     codec = st->codec;
  375.     codec->time_base = av_inv_q(framerate_q);
  376.     codec->codec_type = AVMEDIA_TYPE_VIDEO;
  377.     codec->width  = bi->bmiHeader.biWidth;
  378.     codec->height = bi->bmiHeader.biHeight;
  379.     codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
  380.     if(codec->pix_fmt == AV_PIX_FMT_NONE) {
  381.         codec->codec_id = vfw_codecid(biCompression);
  382.         if(codec->codec_id == AV_CODEC_ID_NONE) {
  383.             av_log(s, AV_LOG_ERROR, "Unknown compression type. "
  384.                              "Please report verbose (-v 9) debug information.\n");
  385.             vfw_read_close(s);
  386.             return AVERROR_PATCHWELCOME;
  387.         }
  388.         codec->bits_per_coded_sample = biBitCount;
  389.     } else {
  390.         codec->codec_id = AV_CODEC_ID_RAWVIDEO;
  391.         if(biCompression == BI_RGB) {
  392.             codec->bits_per_coded_sample = biBitCount;
  393.             codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
  394.             if (codec->extradata) {
  395.                 codec->extradata_size = 9;
  396.                 memcpy(codec->extradata, "BottomUp", 9);
  397.             }
  398.         }
  399.     }
  400.  
  401.     av_freep(&bi);
  402.  
  403.     avpriv_set_pts_info(st, 32, 1, 1000);
  404.  
  405.     ctx->mutex = CreateMutex(NULL, 0, NULL);
  406.     if(!ctx->mutex) {
  407.         av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
  408.         goto fail;
  409.     }
  410.     ctx->event = CreateEvent(NULL, 1, 0, NULL);
  411.     if(!ctx->event) {
  412.         av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
  413.         goto fail;
  414.     }
  415.  
  416.     ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
  417.     if(!ret) {
  418.         av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
  419.         goto fail;
  420.     }
  421.  
  422.     return 0;
  423.  
  424. fail:
  425.     av_freep(&bi);
  426.     vfw_read_close(s);
  427.     return AVERROR(EIO);
  428. }
  429.  
  430. static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
  431. {
  432.     struct vfw_ctx *ctx = s->priv_data;
  433.     AVPacketList *pktl = NULL;
  434.  
  435.     while(!pktl) {
  436.         WaitForSingleObject(ctx->mutex, INFINITE);
  437.         pktl = ctx->pktl;
  438.         if(ctx->pktl) {
  439.             *pkt = ctx->pktl->pkt;
  440.             ctx->pktl = ctx->pktl->next;
  441.             av_free(pktl);
  442.         }
  443.         ResetEvent(ctx->event);
  444.         ReleaseMutex(ctx->mutex);
  445.         if(!pktl) {
  446.             if(s->flags & AVFMT_FLAG_NONBLOCK) {
  447.                 return AVERROR(EAGAIN);
  448.             } else {
  449.                 WaitForSingleObject(ctx->event, INFINITE);
  450.             }
  451.         }
  452.     }
  453.  
  454.     ctx->curbufsize -= pkt->size;
  455.  
  456.     return pkt->size;
  457. }
  458.  
  459. #define OFFSET(x) offsetof(struct vfw_ctx, x)
  460. #define DEC AV_OPT_FLAG_DECODING_PARAM
  461. static const AVOption options[] = {
  462.     { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
  463.     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
  464.     { NULL },
  465. };
  466.  
  467. static const AVClass vfw_class = {
  468.     .class_name = "VFW indev",
  469.     .item_name  = av_default_item_name,
  470.     .option     = options,
  471.     .version    = LIBAVUTIL_VERSION_INT,
  472. };
  473.  
  474. AVInputFormat ff_vfwcap_demuxer = {
  475.     .name           = "vfwcap",
  476.     .long_name      = NULL_IF_CONFIG_SMALL("VfW video capture"),
  477.     .priv_data_size = sizeof(struct vfw_ctx),
  478.     .read_header    = vfw_read_header,
  479.     .read_packet    = vfw_read_packet,
  480.     .read_close     = vfw_read_close,
  481.     .flags          = AVFMT_NOFILE,
  482.     .priv_class     = &vfw_class,
  483. };
  484.