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FFmpeg/libavdevice/vfwcap.c
Andreas Rheinhardt d61240f8c9 avcodec/packet_internal: Add proper PacketList struct 
Up until now, we had a PacketList structure which is actually
a PacketListEntry; a proper PacketList did not exist
and all the related functions just passed pointers to pointers
to the head and tail elements around. All these pointers were
actually consecutive elements of their containing structs,
i.e. the users already treated them as if they were a struct.

So add a proper PacketList struct and rename the current PacketList
to PacketListEntry; also make the functions use this structure
instead of the pair of pointers.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-01-04 13:16:50 +01:00

495 lines
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/*
* 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 "libavutil/internal.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavcodec/packet_internal.h"
#include "libavformat/internal.h"
// windows.h must no be included before winsock2.h, and libavformat internal
// headers may include winsock2.h
#include <windows.h>
// windows.h needs to be included before vfw.h
#include <vfw.h>
#include "avdevice.h"
/* Some obsolete versions of MinGW32 before 4.0.0 lack this. */
#ifndef HWND_MESSAGE
#define HWND_MESSAGE ((HWND) -3)
#endif
struct vfw_ctx {
const AVClass *class;
HWND hwnd;
HANDLE mutex;
HANDLE event;
PacketListEntry *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;
static const uint8_t dropscore[4] = { 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;
PacketListEntry **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(*pktl_next));
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;
PacketListEntry *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) {
PacketListEntry *next = pktl->next;
av_packet_unref(&pktl->pkt);
av_free(pktl);
pktl = next;
}
return 0;
}
static int vfw_read_header(AVFormatContext *s)
{
struct vfw_ctx *ctx = s->priv_data;
AVCodecParameters *par;
AVStream *st;
int devnum;
int bisize;
BITMAPINFO *bi = NULL;
CAPTUREPARMS cparms;
DWORD biCompression;
WORD biBitCount;
int ret;
AVRational framerate_q;
if (!strcmp(s->url, "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->url);
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) {
int w, h;
ret = av_parse_video_size(&w, &h, ctx->video_size);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
goto fail;
}
bi->bmiHeader.biWidth = w;
bi->bmiHeader.biHeight = h;
}
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;
st->avg_frame_rate = framerate_q;
par = st->codecpar;
par->codec_type = AVMEDIA_TYPE_VIDEO;
par->width = bi->bmiHeader.biWidth;
par->height = bi->bmiHeader.biHeight;
par->format = vfw_pixfmt(biCompression, biBitCount);
if (par->format == AV_PIX_FMT_NONE) {
par->codec_id = vfw_codecid(biCompression);
if (par->codec_id == AV_CODEC_ID_NONE) {
avpriv_report_missing_feature(s, "This compression type");
vfw_read_close(s);
return AVERROR_PATCHWELCOME;
}
par->bits_per_coded_sample = biBitCount;
} else {
par->codec_id = AV_CODEC_ID_RAWVIDEO;
if(biCompression == BI_RGB) {
par->bits_per_coded_sample = biBitCount;
par->extradata = av_malloc(9 + AV_INPUT_BUFFER_PADDING_SIZE);
if (par->extradata) {
par->extradata_size = 9;
memcpy(par->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;
PacketListEntry *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,
.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT
};
const 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,
};
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