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Diffstat (limited to 'ffmpeg/libavdevice/vfwcap.c')
-rw-r--r--ffmpeg/libavdevice/vfwcap.c483
1 files changed, 483 insertions, 0 deletions
diff --git a/ffmpeg/libavdevice/vfwcap.c b/ffmpeg/libavdevice/vfwcap.c
new file mode 100644
index 0000000..66b02be
--- /dev/null
+++ b/ffmpeg/libavdevice/vfwcap.c
@@ -0,0 +1,483 @@
+/*
+ * 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 "libavformat/internal.h"
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include <windows.h>
+#include <vfw.h>
+#include "avdevice.h"
+
+/* Defines for VFW missing from MinGW.
+ * Remove this when MinGW incorporates them. */
+#define HWND_MESSAGE ((HWND)-3)
+
+/* End of missing MinGW defines */
+
+struct vfw_ctx {
+ const AVClass *class;
+ HWND hwnd;
+ HANDLE mutex;
+ HANDLE event;
+ AVPacketList *pktl;
+ unsigned int curbufsize;
+ unsigned int frame_num;
+ char *video_size; /**< A string describing video size, set by a private option. */
+ char *framerate; /**< Set by a private option. */
+};
+
+static enum AVPixelFormat vfw_pixfmt(DWORD biCompression, WORD biBitCount)
+{
+ switch(biCompression) {
+ case MKTAG('U', 'Y', 'V', 'Y'):
+ return AV_PIX_FMT_UYVY422;
+ case MKTAG('Y', 'U', 'Y', '2'):
+ return AV_PIX_FMT_YUYV422;
+ case MKTAG('I', '4', '2', '0'):
+ return AV_PIX_FMT_YUV420P;
+ case BI_RGB:
+ switch(biBitCount) { /* 1-8 are untested */
+ case 1:
+ return AV_PIX_FMT_MONOWHITE;
+ case 4:
+ return AV_PIX_FMT_RGB4;
+ case 8:
+ return AV_PIX_FMT_RGB8;
+ case 16:
+ return AV_PIX_FMT_RGB555;
+ case 24:
+ return AV_PIX_FMT_BGR24;
+ case 32:
+ return AV_PIX_FMT_RGB32;
+ }
+ }
+ return AV_PIX_FMT_NONE;
+}
+
+static enum AVCodecID vfw_codecid(DWORD biCompression)
+{
+ switch(biCompression) {
+ case MKTAG('d', 'v', 's', 'd'):
+ return AV_CODEC_ID_DVVIDEO;
+ case MKTAG('M', 'J', 'P', 'G'):
+ case MKTAG('m', 'j', 'p', 'g'):
+ return AV_CODEC_ID_MJPEG;
+ }
+ return AV_CODEC_ID_NONE;
+}
+
+#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
+ 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(AVFormatContext *s)
+{
+ struct vfw_ctx *ctx = s->priv_data;
+ const uint8_t dropscore[] = {62, 75, 87, 100};
+ const int ndropscores = FF_ARRAY_ELEMS(dropscore);
+ unsigned int buffer_fullness = (ctx->curbufsize*100)/s->max_picture_buffer;
+
+ if(dropscore[++ctx->frame_num%ndropscores] <= buffer_fullness) {
+ av_log(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)
+{
+ AVFormatContext *s;
+ struct vfw_ctx *ctx;
+ AVPacketList **ppktl, *pktl_next;
+
+ s = (AVFormatContext *) GetWindowLongPtr(hwnd, GWLP_USERDATA);
+ ctx = s->priv_data;
+
+ dump_videohdr(s, vdhdr);
+
+ if(shall_we_drop(s))
+ 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)
+{
+ struct vfw_ctx *ctx = s->priv_data;
+ AVPacketList *pktl;
+
+ 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);
+
+ pktl = ctx->pktl;
+ while (pktl) {
+ AVPacketList *next = pktl->next;
+ av_destruct_packet(&pktl->pkt);
+ av_free(pktl);
+ pktl = next;
+ }
+
+ return 0;
+}
+
+static int vfw_read_header(AVFormatContext *s)
+{
+ struct vfw_ctx *ctx = s->priv_data;
+ AVCodecContext *codec;
+ AVStream *st;
+ int devnum;
+ int bisize;
+ BITMAPINFO *bi = NULL;
+ CAPTUREPARMS cparms;
+ DWORD biCompression;
+ WORD biBitCount;
+ int ret;
+ AVRational framerate_q;
+
+ if (!strcmp(s->filename, "list")) {
+ for (devnum = 0; devnum <= 9; devnum++) {
+ char driver_name[256];
+ char driver_ver[256];
+ ret = capGetDriverDescription(devnum,
+ driver_name, sizeof(driver_name),
+ driver_ver, sizeof(driver_ver));
+ if (ret) {
+ av_log(s, AV_LOG_INFO, "Driver %d\n", devnum);
+ av_log(s, AV_LOG_INFO, " %s\n", driver_name);
+ av_log(s, AV_LOG_INFO, " %s\n", driver_ver);
+ }
+ }
+ return AVERROR(EIO);
+ }
+
+ 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(EIO);
+ }
+
+ /* 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");
+ goto fail;
+ }
+
+ SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR) s);
+
+ st = avformat_new_stream(s, NULL);
+ if(!st) {
+ vfw_read_close(s);
+ return AVERROR(ENOMEM);
+ }
+
+ /* Set video format */
+ bisize = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0);
+ if(!bisize)
+ goto fail;
+ bi = av_malloc(bisize);
+ if(!bi) {
+ vfw_read_close(s);
+ return AVERROR(ENOMEM);
+ }
+ ret = SendMessage(ctx->hwnd, WM_CAP_GET_VIDEOFORMAT, bisize, (LPARAM) bi);
+ if(!ret)
+ goto fail;
+
+ dump_bih(s, &bi->bmiHeader);
+
+ ret = av_parse_video_rate(&framerate_q, ctx->framerate);
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", ctx->framerate);
+ goto fail;
+ }
+
+ if (ctx->video_size) {
+ ret = av_parse_video_size(&bi->bmiHeader.biWidth, &bi->bmiHeader.biHeight, ctx->video_size);
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
+ goto fail;
+ }
+ }
+
+ if (0) {
+ /* For testing yet unsupported compressions
+ * Copy these values from user-supplied verbose information */
+ bi->bmiHeader.biWidth = 320;
+ bi->bmiHeader.biHeight = 240;
+ bi->bmiHeader.biPlanes = 1;
+ bi->bmiHeader.biBitCount = 12;
+ bi->bmiHeader.biCompression = MKTAG('I','4','2','0');
+ bi->bmiHeader.biSizeImage = 115200;
+ dump_bih(s, &bi->bmiHeader);
+ }
+
+ 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");
+ goto fail;
+ }
+
+ biCompression = bi->bmiHeader.biCompression;
+ biBitCount = bi->bmiHeader.biBitCount;
+
+ /* Set sequence setup */
+ ret = SendMessage(ctx->hwnd, WM_CAP_GET_SEQUENCE_SETUP, sizeof(cparms),
+ (LPARAM) &cparms);
+ if(!ret)
+ goto fail;
+
+ dump_captureparms(s, &cparms);
+
+ cparms.fYield = 1; // Spawn a background thread
+ cparms.dwRequestMicroSecPerFrame =
+ (framerate_q.den*1000000) / framerate_q.num;
+ 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)
+ goto fail;
+
+ codec = st->codec;
+ codec->time_base = av_inv_q(framerate_q);
+ codec->codec_type = AVMEDIA_TYPE_VIDEO;
+ codec->width = bi->bmiHeader.biWidth;
+ codec->height = bi->bmiHeader.biHeight;
+ codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
+ if(codec->pix_fmt == AV_PIX_FMT_NONE) {
+ codec->codec_id = vfw_codecid(biCompression);
+ if(codec->codec_id == AV_CODEC_ID_NONE) {
+ av_log(s, AV_LOG_ERROR, "Unknown compression type. "
+ "Please report verbose (-v 9) debug information.\n");
+ vfw_read_close(s);
+ return AVERROR_PATCHWELCOME;
+ }
+ codec->bits_per_coded_sample = biBitCount;
+ } else {
+ codec->codec_id = AV_CODEC_ID_RAWVIDEO;
+ if(biCompression == BI_RGB) {
+ codec->bits_per_coded_sample = biBitCount;
+ codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (codec->extradata) {
+ codec->extradata_size = 9;
+ memcpy(codec->extradata, "BottomUp", 9);
+ }
+ }
+ }
+
+ av_freep(&bi);
+
+ avpriv_set_pts_info(st, 32, 1, 1000);
+
+ ctx->mutex = CreateMutex(NULL, 0, NULL);
+ if(!ctx->mutex) {
+ av_log(s, AV_LOG_ERROR, "Could not create Mutex.\n" );
+ goto fail;
+ }
+ ctx->event = CreateEvent(NULL, 1, 0, NULL);
+ if(!ctx->event) {
+ av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
+ goto fail;
+ }
+
+ ret = SendMessage(ctx->hwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0);
+ if(!ret) {
+ av_log(s, AV_LOG_ERROR, "Could not start capture sequence.\n" );
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ av_freep(&bi);
+ vfw_read_close(s);
+ return AVERROR(EIO);
+}
+
+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;
+}
+
+#define OFFSET(x) offsetof(struct vfw_ctx, x)
+#define DEC AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+ { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
+ { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = "ntsc"}, 0, 0, DEC },
+ { NULL },
+};
+
+static const AVClass vfw_class = {
+ .class_name = "VFW indev",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_vfwcap_demuxer = {
+ .name = "vfwcap",
+ .long_name = NULL_IF_CONFIG_SMALL("VfW video capture"),
+ .priv_data_size = sizeof(struct vfw_ctx),
+ .read_header = vfw_read_header,
+ .read_packet = vfw_read_packet,
+ .read_close = vfw_read_close,
+ .flags = AVFMT_NOFILE,
+ .priv_class = &vfw_class,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 12:51:03 +0000