VFW capture support

Originally committed as revision 12384 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -836,6 +836,8 @@ rtsp_demuxer_deps="sdp_demuxer"
 sdp_demuxer_deps="rtp_protocol mpegts_demuxer"
 v4l2_demuxer_deps="linux_videodev2_h"
 v4l_demuxer_deps="linux_videodev_h"
+vfwcap_demuxer_deps="capCreateCaptureWindow"
+vfwcap_demuxer_extralibs="-lvfw32"
 x11_grab_device_demuxer_deps="x11grab XShmCreateImage"
 x11_grab_device_demuxer_extralibs="-lX11 -lXext"
 
@@ -1753,6 +1755,8 @@ EOF
 check_header linux/videodev.h
 check_header linux/videodev2.h
 
+check_func2 "windows.h vfw.h" capCreateCaptureWindow -lvfw32
+
 # check for ioctl_meteor.h, ioctl_bt848.h and alternatives
 { check_header dev/bktr/ioctl_meteor.h &&
   check_header dev/bktr/ioctl_bt848.h; } ||

libavdevice/Makefile

@@ -14,6 +14,7 @@ OBJS-$(CONFIG_OSS_DEMUXER)               += audio.o
 OBJS-$(CONFIG_OSS_MUXER)                 += audio.o
 OBJS-$(CONFIG_V4L2_DEMUXER)              += v4l2.o
 OBJS-$(CONFIG_V4L_DEMUXER)               += v4l.o
+OBJS-$(CONFIG_VFWCAP_DEMUXER)            += vfwcap.o
 OBJS-$(CONFIG_X11_GRAB_DEVICE_DEMUXER)   += x11grab.o
 
 # external libraries

libavdevice/alldevices.c

@@ -43,6 +43,7 @@ void avdevice_register_all(void)
     REGISTER_MUXDEMUX (OSS, oss);
     REGISTER_DEMUXER  (V4L2, v4l2);
     REGISTER_DEMUXER  (V4L, v4l);
+    REGISTER_DEMUXER  (VFWCAP, vfwcap);
     REGISTER_DEMUXER  (X11_GRAB_DEVICE, x11_grab_device);
 
     /* external libraries */

libavdevice/vfwcap.c

+/*
+ * VFW capture interface
+ * Copyright (c) 2006-2008 Ramiro Polla.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avformat.h"
+#include <vfw.h>
+#include <windows.h>
+
+//#define DEBUG_VFW
+
+/* Defines for VFW missing from MinGW.
+ * Remove this when MinGW incorporates them. */
+#define WM_CAP_START                (0x0400)
+#define WM_CAP_SET_CALLBACK_VIDEOSTREAM (WM_CAP_START + 6)
+#define WM_CAP_DRIVER_CONNECT       (WM_CAP_START + 10)
+#define WM_CAP_DRIVER_DISCONNECT    (WM_CAP_START + 11)
+#define WM_CAP_GET_VIDEOFORMAT      (WM_CAP_START + 44)
+#define WM_CAP_SET_VIDEOFORMAT      (WM_CAP_START + 45)
+#define WM_CAP_SET_PREVIEW          (WM_CAP_START + 50)
+#define WM_CAP_SET_OVERLAY          (WM_CAP_START + 51)
+#define WM_CAP_SEQUENCE_NOFILE      (WM_CAP_START + 63)
+#define WM_CAP_SET_SEQUENCE_SETUP   (WM_CAP_START + 64)
+#define WM_CAP_GET_SEQUENCE_SETUP   (WM_CAP_START + 65)
+
+#define HWND_MESSAGE                ((HWND)-3)
+
+#define BI_RGB                      0
+
+typedef struct videohdr_tag {
+    LPBYTE      lpData;
+    DWORD       dwBufferLength;
+    DWORD       dwBytesUsed;
+    DWORD       dwTimeCaptured;
+    DWORD       dwUser;
+    DWORD       dwFlags;
+    DWORD_PTR   dwReserved[4];
+} VIDEOHDR, NEAR *PVIDEOHDR, FAR * LPVIDEOHDR;
+
+typedef struct {
+    DWORD dwRequestMicroSecPerFrame;
+    BOOL  fMakeUserHitOKToCapture;
+    UINT  wPercentDropForError;
+    BOOL  fYield;
+    DWORD dwIndexSize;
+    UINT  wChunkGranularity;
+    BOOL  fUsingDOSMemory;
+    UINT  wNumVideoRequested;
+    BOOL  fCaptureAudio;
+    UINT  wNumAudioRequested;
+    UINT  vKeyAbort;
+    BOOL  fAbortLeftMouse;
+    BOOL  fAbortRightMouse;
+    BOOL  fLimitEnabled;
+    UINT  wTimeLimit;
+    BOOL  fMCIControl;
+    BOOL  fStepMCIDevice;
+    DWORD dwMCIStartTime;
+    DWORD dwMCIStopTime;
+    BOOL  fStepCaptureAt2x;
+    UINT  wStepCaptureAverageFrames;
+    DWORD dwAudioBufferSize;
+    BOOL  fDisableWriteCache;
+    UINT  AVStreamMaster;
+} CAPTUREPARMS;
+/* End of missing MinGW defines */
+
+struct vfw_ctx {
+    HWND hwnd;
+    HANDLE mutex;
+    HANDLE event;
+    AVPacketList *pktl;
+    AVFormatContext *s;
+    unsigned int curbufsize;
+    unsigned int frame_num;
+};
+
+static enum PixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
+{
+    switch(biCompression) {
+    case MKTAG('Y', 'U', 'Y', '2'):
+        return PIX_FMT_YUYV422;
+    case BI_RGB:
+        switch(biBitCount) { /* 1-8 are untested */
+            case 1:
+                return PIX_FMT_MONOWHITE;
+            case 4:
+                return PIX_FMT_RGB4;
+            case 8:
+                return PIX_FMT_RGB8;
+            case 16:
+                return PIX_FMT_RGB555;
+            case 24:
+                return PIX_FMT_BGR24;
+            case 32:
+                return PIX_FMT_RGB32;
+        }
+    }
+    return -1;
+}
+
+#define dstruct(pctx, sname, var, type) \
+    av_log(pctx, AV_LOG_DEBUG, #var":\t%"type"\n", sname->var)
+
+static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
+{
+    av_log(s, AV_LOG_DEBUG, "CAPTUREPARMS\n");
+    dstruct(s, cparms, dwRequestMicroSecPerFrame, "lu");
+    dstruct(s, cparms, fMakeUserHitOKToCapture, "d");
+    dstruct(s, cparms, wPercentDropForError, "u");
+    dstruct(s, cparms, fYield, "d");
+    dstruct(s, cparms, dwIndexSize, "lu");
+    dstruct(s, cparms, wChunkGranularity, "u");
+    dstruct(s, cparms, fUsingDOSMemory, "d");
+    dstruct(s, cparms, wNumVideoRequested, "u");
+    dstruct(s, cparms, fCaptureAudio, "d");
+    dstruct(s, cparms, wNumAudioRequested, "u");
+    dstruct(s, cparms, vKeyAbort, "u");
+    dstruct(s, cparms, fAbortLeftMouse, "d");
+    dstruct(s, cparms, fAbortRightMouse, "d");
+    dstruct(s, cparms, fLimitEnabled, "d");
+    dstruct(s, cparms, wTimeLimit, "u");
+    dstruct(s, cparms, fMCIControl, "d");
+    dstruct(s, cparms, fStepMCIDevice, "d");
+    dstruct(s, cparms, dwMCIStartTime, "lu");
+    dstruct(s, cparms, dwMCIStopTime, "lu");
+    dstruct(s, cparms, fStepCaptureAt2x, "d");
+    dstruct(s, cparms, wStepCaptureAverageFrames, "u");
+    dstruct(s, cparms, dwAudioBufferSize, "lu");
+    dstruct(s, cparms, fDisableWriteCache, "d");
+    dstruct(s, cparms, AVStreamMaster, "u");
+}
+
+static void dump_videohdr(AVFormatContext *s, VIDEOHDR *vhdr)
+{
+#ifdef DEBUG_VFW
+    av_log(s, AV_LOG_DEBUG, "VIDEOHDR\n");
+    dstruct(s, vhdr, lpData, "p");
+    dstruct(s, vhdr, dwBufferLength, "lu");
+    dstruct(s, vhdr, dwBytesUsed, "lu");
+    dstruct(s, vhdr, dwTimeCaptured, "lu");
+    dstruct(s, vhdr, dwUser, "lu");
+    dstruct(s, vhdr, dwFlags, "lu");
+    dstruct(s, vhdr, dwReserved[0], "lu");
+    dstruct(s, vhdr, dwReserved[1], "lu");
+    dstruct(s, vhdr, dwReserved[2], "lu");
+    dstruct(s, vhdr, dwReserved[3], "lu");
+#endif
+}
+
+static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
+{
+    av_log(s, AV_LOG_DEBUG, "BITMAPINFOHEADER\n");
+    dstruct(s, bih, biSize, "lu");
+    dstruct(s, bih, biWidth, "ld");
+    dstruct(s, bih, biHeight, "ld");
+    dstruct(s, bih, biPlanes, "d");
+    dstruct(s, bih, biBitCount, "d");
+    dstruct(s, bih, biCompression, "lu");
+    av_log(s, AV_LOG_DEBUG, "    biCompression:\t\"%.4s\"\n",
+                   (char*) &bih->biCompression);
+    dstruct(s, bih, biSizeImage, "lu");
+    dstruct(s, bih, biXPelsPerMeter, "lu");
+    dstruct(s, bih, biYPelsPerMeter, "lu");
+    dstruct(s, bih, biClrUsed, "lu");
+    dstruct(s, bih, biClrImportant, "lu");
+}
+
+static int shall_we_drop(struct vfw_ctx *ctx)
+{
+    AVFormatContext *s = ctx->s;
+    const uint8_t dropscore[] = {62, 75, 87, 100};
+    const int ndropscores = sizeof(dropscore)/sizeof(dropscore[0]);
+    unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
+
+    if(dropscore[++ctx->frame_num%ndropscores] < buffer_fullness) {
+        av_log(ctx->s, AV_LOG_ERROR,
+              "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
+        return 1;
+    }
+
+    return 0;
+}
+
+static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
+{
+    struct vfw_ctx *ctx;
+    AVPacketList **ppktl, *pktl_next;
+
+    ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
+
+    dump_videohdr(ctx->s, vdhdr);
+
+    if(shall_we_drop(ctx))
+        return FALSE;
+
+    WaitForSingleObject(ctx->mutex, INFINITE);
+
+    pktl_next = av_mallocz(sizeof(AVPacketList));
+    if(!pktl_next)
+        goto fail;
+
+    if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
+        av_free(pktl_next);
+        goto fail;
+    }
+
+    pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
+    memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
+
+    for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
+    *ppktl = pktl_next;
+
+    ctx->curbufsize += vdhdr->dwBytesUsed;
+
+    SetEvent(ctx->event);
+    ReleaseMutex(ctx->mutex);
+
+    return TRUE;
+fail:
+    ReleaseMutex(ctx->mutex);
+    return FALSE;
+}
+
+static int vfw_read_close(AVFormatContext *s);
+
+static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    struct vfw_ctx *ctx = s->priv_data;
+    AVCodecContext *codec;
+    AVStream *st;
+    int devnum;
+    int bisize;
+    BITMAPINFO *bi;
+    CAPTUREPARMS cparms;
+    DWORD biCompression;
+    WORD biBitCount;
+    int width;
+    int height;
+    int ret;
+
+    if(!ap->time_base.den) {
+        av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
+        return AVERROR_IO;
+    }
+
+    ctx->s = s;
+
+    ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
+    if(!ctx->hwnd) {
+        av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
+        return AVERROR_IO;
+    }
+
+    /* If atoi fails, devnum==0 and the default device is used */
+    devnum = atoi(s->filename);
+
+    ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
+    if(!ret) {
+        av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
+        DestroyWindow(ctx->hwnd);
+        return AVERROR(ENODEV);
+    }
+
+    SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
+    SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
+
+    ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
+                      (LPARAM) videostream_cb);
+    if(!ret) {
+        av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+
+    SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) ctx);
+
+    st = av_new_stream(s, 0);
+    if(!st) {
+        vfw_read_close(s);
+        return AVERROR_NOMEM;
+    }
+
+    /* Set video format */
+    bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
+    if(!bisize) {
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+    bi = av_malloc(bisize);
+    if(!bi) {
+        vfw_read_close(s);
+        return AVERROR_NOMEM;
+    }
+    ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
+    if(!ret) {
+        av_free(bi);
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+
+    dump_bih(s, &bi->bmiHeader);
+
+    width  = ap->width  ? ap->width  : bi->bmiHeader.biWidth ;
+    height = ap->height ? ap->height : bi->bmiHeader.biHeight;
+    bi->bmiHeader.biWidth  = width ;
+    bi->bmiHeader.biHeight = height;
+
+    ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
+    if(!ret) {
+        av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
+        av_free(bi);
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+
+    biCompression = bi->bmiHeader.biCompression;
+    biBitCount = bi->bmiHeader.biBitCount;
+
+    av_free(bi);
+
+    /* Set sequence setup */
+    ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
+                      (LPARAM) &cparms);
+    if(!ret) {
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+
+    dump_captureparms(s, &cparms);
+
+    cparms.fYield = 1; // Spawn a background thread
+    cparms.dwRequestMicroSecPerFrame =
+                               (ap->time_base.num*1000000) / ap->time_base.den;
+    cparms.fAbortLeftMouse = 0;
+    cparms.fAbortRightMouse = 0;
+    cparms.fCaptureAudio = 0;
+    cparms.vKeyAbort = 0;
+
+    ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
+                      (LPARAM) &cparms);
+    if(!ret) {
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+
+    codec = st->codec;
+    codec->time_base = ap->time_base;
+    codec->codec_type = CODEC_TYPE_VIDEO;
+    codec->width = width;
+    codec->height = height;
+    codec->codec_id = CODEC_ID_RAWVIDEO;
+    codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
+    if(biCompression == BI_RGB)
+        codec->bits_per_sample = biBitCount;
+
+    av_set_pts_info(st, 32, 1, 1000);
+
+    if(codec->pix_fmt == -1) {
+        av_log(s, AV_LOG_ERROR, "Unknown compression type."
+                         "Please report verbose (-v 99) debug information.\n");
+        vfw_read_close(s);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    ctx->mutex = CreateMutex(NULL, 0, NULL);
+    if(!ctx->mutex) {
+        av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+    ctx->event = CreateEvent(NULL, 1, 0, NULL);
+    if(!ctx->event) {
+        av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+
+    ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
+    if(!ret) {
+        av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
+        vfw_read_close(s);
+        return AVERROR_IO;
+    }
+
+    return 0;
+}
+
+static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    struct vfw_ctx *ctx = s->priv_data;
+    AVPacketList *pktl = NULL;
+
+    while(!pktl) {
+        WaitForSingleObject(ctx->mutex, INFINITE);
+        pktl = ctx->pktl;
+        if(ctx->pktl) {
+            *pkt = ctx->pktl->pkt;
+            ctx->pktl = ctx->pktl->next;
+            av_free(pktl);
+        }
+        ResetEvent(ctx->event);
+        ReleaseMutex(ctx->mutex);
+        if(!pktl) {
+            if(s->flags & AVFMT_FLAG_NONBLOCK) {
+                return AVERROR(EAGAIN);
+            } else {
+                WaitForSingleObject(ctx->event, INFINITE);
+            }
+        }
+    }
+
+    ctx->curbufsize -= pkt->size;
+
+    return pkt->size;
+}
+
+static int vfw_read_close(AVFormatContext *s)
+{
+    struct vfw_ctx *ctx = s->priv_data;
+
+    if(ctx->hwnd) {
+        SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
+        SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
+        DestroyWindow(ctx->hwnd);
+    }
+    if(ctx->mutex)
+        CloseHandle(ctx->mutex);
+    if(ctx->event)
+        CloseHandle(ctx->event);
+
+    return 0;
+}
+
+AVInputFormat vfwcap_demuxer = {
+    "vfwcap",
+    "VFW video capture",
+    sizeof(struct vfw_ctx),
+    NULL,
+    vfw_read_header,
+    vfw_read_packet,
+    vfw_read_close,
+    .flags = AVFMT_NOFILE,
+};