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ffmpeg / libavdevice / vfwcap.c @ 72415b2a

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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
8
 * 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 {
37
    HWND hwnd;
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    HANDLE mutex;
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    HANDLE event;
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    AVPacketList *pktl;
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    unsigned int curbufsize;
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    unsigned int frame_num;
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};
44

    
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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('U', 'Y', 'V', 'Y'):
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        return PIX_FMT_UYVY422;
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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;
54
    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;
60
            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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    case MKTAG('M', 'J', 'P', 'G'):
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    case MKTAG('m', 'j', 'p', 'g'):
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        return CODEC_ID_MJPEG;
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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)
87

    
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static void dump_captureparms(AVFormatContext *s, CAPTUREPARMS *cparms)
89
{
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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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}
116

    
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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");
131
#endif
132
}
133

    
134
static void dump_bih(AVFormatContext *s, BITMAPINFOHEADER *bih)
135
{
136
    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);
145
    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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}
151

    
152
static int shall_we_drop(AVFormatContext *s)
153
{
154
    struct vfw_ctx *ctx = s->priv_data;
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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;
158

    
159
    if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
160
        av_log(s, AV_LOG_ERROR,
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              "real-time buffer %d%% full! frame dropped!\n", buffer_fullness);
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        return 1;
163
    }
164

    
165
    return 0;
166
}
167

    
168
static LRESULT CALLBACK videostream_cb(HWND hwnd, LPVIDEOHDR vdhdr)
169
{
170
    AVFormatContext *s;
171
    struct vfw_ctx *ctx;
172
    AVPacketList **ppktl, *pktl_next;
173

    
174
    s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
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    ctx = s->priv_data;
176

    
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    dump_videohdr(s, vdhdr);
178

    
179
    if(shall_we_drop(s))
180
        return FALSE;
181

    
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    WaitForSingleObject(ctx->mutex, INFINITE);
183

    
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    pktl_next = av_mallocz(sizeof(AVPacketList));
185
    if(!pktl_next)
186
        goto fail;
187

    
188
    if(av_new_packet(&pktl_next->pkt, vdhdr->dwBytesUsed) < 0) {
189
        av_free(pktl_next);
190
        goto fail;
191
    }
192

    
193
    pktl_next->pkt.pts = vdhdr->dwTimeCaptured;
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    memcpy(pktl_next->pkt.data, vdhdr->lpData, vdhdr->dwBytesUsed);
195

    
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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;
200

    
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    SetEvent(ctx->event);
202
    ReleaseMutex(ctx->mutex);
203

    
204
    return TRUE;
205
fail:
206
    ReleaseMutex(ctx->mutex);
207
    return FALSE;
208
}
209

    
210
static int vfw_read_close(AVFormatContext *s)
211
{
212
    struct vfw_ctx *ctx = s->priv_data;
213
    AVPacketList *pktl;
214

    
215
    if(ctx->hwnd) {
216
        SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
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        SendMessage(ctx->hwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0);
218
        DestroyWindow(ctx->hwnd);
219
    }
220
    if(ctx->mutex)
221
        CloseHandle(ctx->mutex);
222
    if(ctx->event)
223
        CloseHandle(ctx->event);
224

    
225
    pktl = ctx->pktl;
226
    while (pktl) {
227
        AVPacketList *next = pktl->next;
228
        av_destruct_packet(&pktl->pkt);
229
        av_free(pktl);
230
        pktl = next;
231
    }
232

    
233
    return 0;
234
}
235

    
236
static int vfw_read_header(AVFormatContext *s, AVFormatParameters *ap)
237
{
238
    struct vfw_ctx *ctx = s->priv_data;
239
    AVCodecContext *codec;
240
    AVStream *st;
241
    int devnum;
242
    int bisize;
243
    BITMAPINFO *bi;
244
    CAPTUREPARMS cparms;
245
    DWORD biCompression;
246
    WORD biBitCount;
247
    int width;
248
    int height;
249
    int ret;
250

    
251
    if(!ap->time_base.den) {
252
        av_log(s, AV_LOG_ERROR, "A time base must be specified.\n");
253
        return AVERROR(EIO);
254
    }
255

    
256
    ctx->hwnd = capCreateCaptureWindow(NULL, 0, 0, 0, 0, 0, HWND_MESSAGE, 0);
257
    if(!ctx->hwnd) {
258
        av_log(s, AV_LOG_ERROR, "Could not create capture window.\n");
259
        return AVERROR(EIO);
260
    }
261

    
262
    /* If atoi fails, devnum==0 and the default device is used */
263
    devnum = atoi(s->filename);
264

    
265
    ret = SendMessage(ctx->hwnd, WM_CAP_DRIVER_CONNECT, devnum, 0);
266
    if(!ret) {
267
        av_log(s, AV_LOG_ERROR, "Could not connect to device.\n");
268
        DestroyWindow(ctx->hwnd);
269
        return AVERROR(ENODEV);
270
    }
271

    
272
    SendMessage(ctx->hwnd, WM_CAP_SET_OVERLAY, 0, 0);
273
    SendMessage(ctx->hwnd, WM_CAP_SET_PREVIEW, 0, 0);
274

    
275
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0,
276
                      (LPARAM) videostream_cb);
277
    if(!ret) {
278
        av_log(s, AV_LOG_ERROR, "Could not set video stream callback.\n");
279
        goto fail_io;
280
    }
281

    
282
    SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
283

    
284
    st = av_new_stream(s, 0);
285
    if(!st) {
286
        vfw_read_close(s);
287
        return AVERROR_NOMEM;
288
    }
289

    
290
    /* Set video format */
291
    bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
292
    if(!bisize)
293
        goto fail_io;
294
    bi = av_malloc(bisize);
295
    if(!bi) {
296
        vfw_read_close(s);
297
        return AVERROR_NOMEM;
298
    }
299
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
300
    if(!ret)
301
        goto fail_bi;
302

    
303
    dump_bih(s, &bi->bmiHeader);
304

    
305
    width  = ap->width  ? ap->width  : bi->bmiHeader.biWidth ;
306
    height = ap->height ? ap->height : bi->bmiHeader.biHeight;
307
    bi->bmiHeader.biWidth  = width ;
308
    bi->bmiHeader.biHeight = height;
309

    
310
    if (0) {
311
        /* For testing yet unsupported compressions
312
         * Copy these values from user-supplied verbose information */
313
        bi->bmiHeader.biWidth       = 320;
314
        bi->bmiHeader.biHeight      = 240;
315
        bi->bmiHeader.biPlanes      = 1;
316
        bi->bmiHeader.biBitCount    = 12;
317
        bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
318
        bi->bmiHeader.biSizeImage   = 115200;
319
        dump_bih(s, &bi->bmiHeader);
320
    }
321

    
322
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_VIDEOFORMAT, bisize, (LPARAM) bi);
323
    if(!ret) {
324
        av_log(s, AV_LOG_ERROR, "Could not set Video Format.\n");
325
        goto fail_bi;
326
    }
327

    
328
    biCompression = bi->bmiHeader.biCompression;
329
    biBitCount = bi->bmiHeader.biBitCount;
330

    
331
    av_free(bi);
332

    
333
    /* Set sequence setup */
334
    ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
335
                      (LPARAM) &cparms);
336
    if(!ret)
337
        goto fail_io;
338

    
339
    dump_captureparms(s, &cparms);
340

    
341
    cparms.fYield = 1; // Spawn a background thread
342
    cparms.dwRequestMicroSecPerFrame =
343
                               (ap->time_base.num*1000000) / ap->time_base.den;
344
    cparms.fAbortLeftMouse = 0;
345
    cparms.fAbortRightMouse = 0;
346
    cparms.fCaptureAudio = 0;
347
    cparms.vKeyAbort = 0;
348

    
349
    ret = SendMessage(ctx->hwnd, WM_CAP_SET_SEQUENCE_SETUP, sizeof(cparms),
350
                      (LPARAM) &cparms);
351
    if(!ret)
352
        goto fail_io;
353

    
354
    codec = st->codec;
355
    codec->time_base = ap->time_base;
356
    codec->codec_type = AVMEDIA_TYPE_VIDEO;
357
    codec->width = width;
358
    codec->height = height;
359
    codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
360
    if(codec->pix_fmt == PIX_FMT_NONE) {
361
        codec->codec_id = vfw_codecid(biCompression);
362
        if(codec->codec_id == CODEC_ID_NONE) {
363
            av_log(s, AV_LOG_ERROR, "Unknown compression type. "
364
                             "Please report verbose (-v 9) debug information.\n");
365
            vfw_read_close(s);
366
            return AVERROR_PATCHWELCOME;
367
        }
368
        codec->bits_per_coded_sample = biBitCount;
369
    } else {
370
        codec->codec_id = CODEC_ID_RAWVIDEO;
371
        if(biCompression == BI_RGB)
372
            codec->bits_per_coded_sample = biBitCount;
373
    }
374

    
375
    av_set_pts_info(st, 32, 1, 1000);
376

    
377
    ctx->mutex = CreateMutex(NULL, 0, NULL);
378
    if(!ctx->mutex) {
379
        av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
380
        goto fail_io;
381
    }
382
    ctx->event = CreateEvent(NULL, 1, 0, NULL);
383
    if(!ctx->event) {
384
        av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
385
        goto fail_io;
386
    }
387

    
388
    ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
389
    if(!ret) {
390
        av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
391
        goto fail_io;
392
    }
393

    
394
    return 0;
395

    
396
fail_bi:
397
    av_free(bi);
398

    
399
fail_io:
400
    vfw_read_close(s);
401
    return AVERROR(EIO);
402
}
403

    
404
static int vfw_read_packet(AVFormatContext *s, AVPacket *pkt)
405
{
406
    struct vfw_ctx *ctx = s->priv_data;
407
    AVPacketList *pktl = NULL;
408

    
409
    while(!pktl) {
410
        WaitForSingleObject(ctx->mutex, INFINITE);
411
        pktl = ctx->pktl;
412
        if(ctx->pktl) {
413
            *pkt = ctx->pktl->pkt;
414
            ctx->pktl = ctx->pktl->next;
415
            av_free(pktl);
416
        }
417
        ResetEvent(ctx->event);
418
        ReleaseMutex(ctx->mutex);
419
        if(!pktl) {
420
            if(s->flags & AVFMT_FLAG_NONBLOCK) {
421
                return AVERROR(EAGAIN);
422
            } else {
423
                WaitForSingleObject(ctx->event, INFINITE);
424
            }
425
        }
426
    }
427

    
428
    ctx->curbufsize -= pkt->size;
429

    
430
    return pkt->size;
431
}
432

    
433
AVInputFormat vfwcap_demuxer = {
434
    "vfwcap",
435
    NULL_IF_CONFIG_SMALL("VFW video capture"),
436
    sizeof(struct vfw_ctx),
437
    NULL,
438
    vfw_read_header,
439
    vfw_read_packet,
440
    vfw_read_close,
441
    .flags = AVFMT_NOFILE,
442
};