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ffmpeg / libavdevice / vfwcap.c @ 420755dd

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1
/*
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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>
25

    
26
//#define DEBUG_VFW
27

    
28
/* 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)
31

    
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#define BI_RGB                      0
33

    
34
/* End of missing MinGW defines */
35

    
36
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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};
45

    
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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 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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    }
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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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}
112

    
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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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}
129

    
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static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
131
{
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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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}
147

    
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static int shall_we_drop(struct vfw_ctx *ctx)
149
{
150
    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;
154

    
155
    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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    }
160

    
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    return 0;
162
}
163

    
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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;
168

    
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    ctx = (struct vfw_ctx *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
170

    
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    dump_videohdr(ctx->s, vdhdr);
172

    
173
    if(shall_we_drop(ctx))
174
        return FALSE;
175

    
176
    WaitForSingleObject(ctx->mutex, INFINITE);
177

    
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    pktl_next = av_mallocz(sizeof(AVPacketList));
179
    if(!pktl_next)
180
        goto fail;
181

    
182
    if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
183
        av_free(pktl_next);
184
        goto fail;
185
    }
186

    
187
    pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
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    memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
189

    
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    for(ppktl = &ctx->pktl ; *ppktl ; ppktl = &(*ppktl)->next);
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    *ppktl = pktl_next;
192

    
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    ctx->curbufsize += vdhdr->dwBytesUsed;
194

    
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    SetEvent(ctx->event);
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    ReleaseMutex(ctx->mutex);
197

    
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    return TRUE;
199
fail:
200
    ReleaseMutex(ctx->mutex);
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    return FALSE;
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}
203

    
204
static int vfw_read_close(AVFormatContext *s)
205
{
206
    struct vfw_ctx *ctx = s->priv_data;
207

    
208
    if(ctx->hwnd) {
209
        SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
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        SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
211
        DestroyWindow(ctx->hwnd);
212
    }
213
    if(ctx->mutex)
214
        CloseHandle(ctx->mutex);
215
    if(ctx->event)
216
        CloseHandle(ctx->event);
217

    
218
    return 0;
219
}
220

    
221
static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
222
{
223
    struct vfw_ctx *ctx = s->priv_data;
224
    AVCodecContext *codec;
225
    AVStream *st;
226
    int devnum;
227
    int bisize;
228
    BITMAPINFO *bi;
229
    CAPTUREPARMS cparms;
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    DWORD biCompression;
231
    WORD biBitCount;
232
    int width;
233
    int height;
234
    int ret;
235

    
236
    if(!ap->time_base.den) {
237
        av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
238
        return AVERROR_IO;
239
    }
240

    
241
    ctx->s = s;
242

    
243
    ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
244
    if(!ctx->hwnd) {
245
        av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
246
        return AVERROR_IO;
247
    }
248

    
249
    /* If atoi fails, devnum==0 and the default device is used */
250
    devnum = atoi(s->filename);
251

    
252
    ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
253
    if(!ret) {
254
        av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
255
        DestroyWindow(ctx->hwnd);
256
        return AVERROR(ENODEV);
257
    }
258

    
259
    SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
260
    SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
261

    
262
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
263
                      (LPARAM) videostream_cb);
264
    if(!ret) {
265
        av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
266
        goto fail_io;
267
    }
268

    
269
    SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) ctx);
270

    
271
    st = av_new_stream(s, 0);
272
    if(!st) {
273
        vfw_read_close(s);
274
        return AVERROR_NOMEM;
275
    }
276

    
277
    /* Set video format */
278
    bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
279
    if(!bisize)
280
        goto fail_io;
281
    bi = av_malloc(bisize);
282
    if(!bi) {
283
        vfw_read_close(s);
284
        return AVERROR_NOMEM;
285
    }
286
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
287
    if(!ret)
288
        goto fail_bi;
289

    
290
    dump_bih(s, &bi->bmiHeader);
291

    
292
    width  = ap->width  ? ap->width  : bi->bmiHeader.biWidth ;
293
    height = ap->height ? ap->height : bi->bmiHeader.biHeight;
294
    bi->bmiHeader.biWidth  = width ;
295
    bi->bmiHeader.biHeight = height;
296

    
297
    if (0) {
298
        /* For testing yet unsupported compressions
299
         * Copy these values from user-supplied verbose information */
300
        bi->bmiHeader.biWidth       = 320;
301
        bi->bmiHeader.biHeight      = 240;
302
        bi->bmiHeader.biPlanes      = 1;
303
        bi->bmiHeader.biBitCount    = 12;
304
        bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
305
        bi->bmiHeader.biSizeImage   = 115200;
306
        dump_bih(s, &bi->bmiHeader);
307
    }
308

    
309
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
310
    if(!ret) {
311
        av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
312
        goto fail_bi;
313
    }
314

    
315
    biCompression = bi->bmiHeader.biCompression;
316
    biBitCount = bi->bmiHeader.biBitCount;
317

    
318
    av_free(bi);
319

    
320
    /* Set sequence setup */
321
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
322
                      (LPARAM) &cparms);
323
    if(!ret)
324
        goto fail_io;
325

    
326
    dump_captureparms(s, &cparms);
327

    
328
    cparms.fYield = 1; // Spawn a background thread
329
    cparms.dwRequestMicroSecPerFrame =
330
                               (ap->time_base.num*1000000) / ap->time_base.den;
331
    cparms.fAbortLeftMouse = 0;
332
    cparms.fAbortRightMouse = 0;
333
    cparms.fCaptureAudio = 0;
334
    cparms.vKeyAbort = 0;
335

    
336
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
337
                      (LPARAM) &cparms);
338
    if(!ret)
339
        goto fail_io;
340

    
341
    codec = st->codec;
342
    codec->time_base = ap->time_base;
343
    codec->codec_type = CODEC_TYPE_VIDEO;
344
    codec->width = width;
345
    codec->height = height;
346
    codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
347
    if(codec->pix_fmt == PIX_FMT_NONE) {
348
        codec->codec_id = vfw_codecid(biCompression);
349
        if(codec->codec_id == CODEC_ID_NONE) {
350
            av_log(s, AV_LOG_ERROR, "Unknown compression type. "
351
                             "Please report verbose (-v 9) debug information.\n");
352
            vfw_read_close(s);
353
            return AVERROR_PATCHWELCOME;
354
        }
355
        codec->bits_per_coded_sample = biBitCount;
356
    } else {
357
        codec->codec_id = CODEC_ID_RAWVIDEO;
358
        if(biCompression == BI_RGB)
359
            codec->bits_per_coded_sample = biBitCount;
360
    }
361

    
362
    av_set_pts_info(st, 32, 1, 1000);
363

    
364
    ctx->mutex = CreateMutex(NULL, 0, NULL);
365
    if(!ctx->mutex) {
366
        av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
367
        goto fail_io;
368
    }
369
    ctx->event = CreateEvent(NULL, 1, 0, NULL);
370
    if(!ctx->event) {
371
        av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
372
        goto fail_io;
373
    }
374

    
375
    ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
376
    if(!ret) {
377
        av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
378
        goto fail_io;
379
    }
380

    
381
    return 0;
382

    
383
fail_bi:
384
    av_free(bi);
385

    
386
fail_io:
387
    vfw_read_close(s);
388
    return AVERROR_IO;
389
}
390

    
391
static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
392
{
393
    struct vfw_ctx *ctx = s->priv_data;
394
    AVPacketList *pktl = NULL;
395

    
396
    while(!pktl) {
397
        WaitForSingleObject(ctx->mutex, INFINITE);
398
        pktl = ctx->pktl;
399
        if(ctx->pktl) {
400
            *pkt = ctx->pktl->pkt;
401
            ctx->pktl = ctx->pktl->next;
402
            av_free(pktl);
403
        }
404
        ResetEvent(ctx->event);
405
        ReleaseMutex(ctx->mutex);
406
        if(!pktl) {
407
            if(s->flags & AVFMT_FLAG_NONBLOCK) {
408
                return AVERROR(EAGAIN);
409
            } else {
410
                WaitForSingleObject(ctx->event, INFINITE);
411
            }
412
        }
413
    }
414

    
415
    ctx->curbufsize -= pkt->size;
416

    
417
    return pkt->size;
418
}
419

    
420
AVInputFormat vfwcap_demuxer = {
421
    "vfwcap",
422
    NULL_IF_CONFIG_SMALL("VFW video capture"),
423
    sizeof(struct vfw_ctx),
424
    NULL,
425
    vfw_read_header,
426
    vfw_read_packet,
427
    vfw_read_close,
428
    .flags = AVFMT_NOFILE,
429
};