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 + AV_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_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");
goto fail_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)
goto fail_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)
goto fail_bi;
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;
#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);
#endif
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_bi;
}
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)
goto fail_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)
goto fail_io;
codec = st->codec;
codec->time_base = ap->time_base;
codec->codec_type = CODEC_TYPE_VIDEO;
codec->width = width;
codec->height = height;
codec->pix_fmt = vfw_pixfmt(biCompression, biBitCount);
if(codec->pix_fmt == PIX_FMT_NONE) {
codec->codec_id = vfw_codecid(biCompression);
if(codec->codec_id == 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 = CODEC_ID_RAWVIDEO;
if(biCompression == BI_RGB)
codec->bits_per_coded_sample = biBitCount;
}
av_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_io;
}
ctx->event = CreateEvent(NULL, 1, 0, NULL);
if(!ctx->event) {
av_log(s, AV_LOG_ERROR, "Could not create Event.\n" );
goto fail_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" );
goto fail_io;
}
return 0;
fail_bi:
av_free(bi);
fail_io:
vfw_read_close(s);
return AVERROR_IO;
}