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953 lines
30 KiB
953 lines
30 KiB
/* |
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* Copyright (c) 2000,2001 Fabrice Bellard |
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* Copyright (c) 2006 Luca Abeni |
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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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|
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/** |
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* @file |
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* Video4Linux2 grab interface |
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* |
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* Part of this file is based on the V4L2 video capture example |
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* (http://v4l2spec.bytesex.org/v4l2spec/capture.c) |
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* |
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* Thanks to Michael Niedermayer for providing the mapping between |
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* V4L2_PIX_FMT_* and PIX_FMT_* |
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*/ |
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#undef __STRICT_ANSI__ //workaround due to broken kernel headers |
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#include "config.h" |
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#include "libavformat/internal.h" |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <sys/ioctl.h> |
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#include <sys/mman.h> |
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#include <sys/time.h> |
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#if HAVE_SYS_VIDEOIO_H |
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#include <sys/videoio.h> |
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#else |
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#if HAVE_ASM_TYPES_H |
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#include <asm/types.h> |
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#endif |
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#include <linux/videodev2.h> |
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#endif |
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#include "libavutil/imgutils.h" |
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#include "libavutil/log.h" |
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#include "libavutil/opt.h" |
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#include "avdevice.h" |
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#include "timefilter.h" |
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#include "libavutil/parseutils.h" |
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#include "libavutil/pixdesc.h" |
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#include "libavutil/avstring.h" |
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|
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#if CONFIG_LIBV4L2 |
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#include <libv4l2.h> |
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#else |
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#define v4l2_open open |
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#define v4l2_close close |
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#define v4l2_dup dup |
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#define v4l2_ioctl ioctl |
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#define v4l2_read read |
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#define v4l2_mmap mmap |
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#define v4l2_munmap munmap |
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#endif |
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static const int desired_video_buffers = 256; |
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|
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#define V4L_ALLFORMATS 3 |
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#define V4L_RAWFORMATS 1 |
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#define V4L_COMPFORMATS 2 |
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|
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/** |
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* Return timestamps to the user exactly as returned by the kernel |
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*/ |
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#define V4L_TS_DEFAULT 0 |
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/** |
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* Autodetect the kind of timestamps returned by the kernel and convert to |
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* absolute (wall clock) timestamps. |
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*/ |
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#define V4L_TS_ABS 1 |
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/** |
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* Assume kernel timestamps are from the monotonic clock and convert to |
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* absolute timestamps. |
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*/ |
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#define V4L_TS_MONO2ABS 2 |
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|
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/** |
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* Once the kind of timestamps returned by the kernel have been detected, |
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* the value of the timefilter (NULL or not) determines whether a conversion |
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* takes place. |
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*/ |
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#define V4L_TS_CONVERT_READY V4L_TS_DEFAULT |
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struct video_data { |
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AVClass *class; |
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int fd; |
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int frame_format; /* V4L2_PIX_FMT_* */ |
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int width, height; |
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int frame_size; |
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int interlaced; |
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int top_field_first; |
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int ts_mode; |
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TimeFilter *timefilter; |
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int64_t last_time_m; |
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int buffers; |
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void **buf_start; |
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unsigned int *buf_len; |
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char *standard; |
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int channel; |
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char *pixel_format; /**< Set by a private option. */ |
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int list_format; /**< Set by a private option. */ |
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char *framerate; /**< Set by a private option. */ |
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}; |
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struct buff_data { |
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int index; |
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int fd; |
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}; |
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struct fmt_map { |
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enum PixelFormat ff_fmt; |
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enum CodecID codec_id; |
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uint32_t v4l2_fmt; |
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}; |
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static struct fmt_map fmt_conversion_table[] = { |
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//ff_fmt codec_id v4l2_fmt |
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{ PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 }, |
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{ PIX_FMT_YUV420P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU420 }, |
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{ PIX_FMT_YUV422P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P }, |
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{ PIX_FMT_YUYV422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV }, |
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{ PIX_FMT_UYVY422, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY }, |
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{ PIX_FMT_YUV411P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P }, |
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{ PIX_FMT_YUV410P, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 }, |
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{ PIX_FMT_RGB555LE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 }, |
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{ PIX_FMT_RGB555BE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555X }, |
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{ PIX_FMT_RGB565LE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 }, |
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{ PIX_FMT_RGB565BE,CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565X }, |
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{ PIX_FMT_BGR24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 }, |
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{ PIX_FMT_RGB24, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 }, |
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{ PIX_FMT_BGR0, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 }, |
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{ PIX_FMT_0RGB, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB32 }, |
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{ PIX_FMT_GRAY8, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY }, |
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{ PIX_FMT_NV12, CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 }, |
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{ PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG }, |
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{ PIX_FMT_NONE, CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG }, |
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}; |
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static int device_open(AVFormatContext *ctx) |
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{ |
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struct v4l2_capability cap; |
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int fd; |
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#if CONFIG_LIBV4L2 |
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int fd_libv4l; |
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#endif |
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int res, err; |
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int flags = O_RDWR; |
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if (ctx->flags & AVFMT_FLAG_NONBLOCK) { |
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flags |= O_NONBLOCK; |
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} |
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fd = v4l2_open(ctx->filename, flags, 0); |
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if (fd < 0) { |
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err = errno; |
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av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n", |
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ctx->filename, strerror(err)); |
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return AVERROR(err); |
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} |
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#if CONFIG_LIBV4L2 |
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fd_libv4l = v4l2_fd_open(fd, 0); |
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if (fd < 0) { |
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err = AVERROR(errno); |
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av_log(ctx, AV_LOG_ERROR, "Cannot open video device with libv4l neither %s : %s\n", |
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ctx->filename, strerror(errno)); |
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return err; |
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} |
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fd = fd_libv4l; |
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#endif |
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res = v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap); |
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if (res < 0) { |
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err = errno; |
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", |
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strerror(err)); |
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goto fail; |
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} |
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av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n", |
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fd, cap.capabilities); |
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if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { |
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av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n"); |
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err = ENODEV; |
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goto fail; |
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} |
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if (!(cap.capabilities & V4L2_CAP_STREAMING)) { |
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av_log(ctx, AV_LOG_ERROR, |
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"The device does not support the streaming I/O method.\n"); |
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err = ENOSYS; |
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goto fail; |
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} |
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return fd; |
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fail: |
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v4l2_close(fd); |
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return AVERROR(err); |
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} |
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static int device_init(AVFormatContext *ctx, int *width, int *height, |
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uint32_t pix_fmt) |
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{ |
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struct video_data *s = ctx->priv_data; |
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int fd = s->fd; |
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struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
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struct v4l2_pix_format *pix = &fmt.fmt.pix; |
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int res; |
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pix->width = *width; |
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pix->height = *height; |
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pix->pixelformat = pix_fmt; |
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pix->field = V4L2_FIELD_ANY; |
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res = v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt); |
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if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) { |
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av_log(ctx, AV_LOG_INFO, |
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"The V4L2 driver changed the video from %dx%d to %dx%d\n", |
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*width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height); |
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*width = fmt.fmt.pix.width; |
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*height = fmt.fmt.pix.height; |
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} |
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if (pix_fmt != fmt.fmt.pix.pixelformat) { |
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av_log(ctx, AV_LOG_DEBUG, |
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"The V4L2 driver changed the pixel format " |
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"from 0x%08X to 0x%08X\n", |
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pix_fmt, fmt.fmt.pix.pixelformat); |
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res = -1; |
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} |
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if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) { |
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av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode"); |
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s->interlaced = 1; |
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} |
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return res; |
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} |
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static int first_field(int fd) |
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{ |
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int res; |
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v4l2_std_id std; |
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res = v4l2_ioctl(fd, VIDIOC_G_STD, &std); |
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if (res < 0) { |
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return 0; |
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} |
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if (std & V4L2_STD_NTSC) { |
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return 0; |
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} |
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return 1; |
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} |
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static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt, enum CodecID codec_id) |
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{ |
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int i; |
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for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { |
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if ((codec_id == CODEC_ID_NONE || |
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fmt_conversion_table[i].codec_id == codec_id) && |
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(pix_fmt == PIX_FMT_NONE || |
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fmt_conversion_table[i].ff_fmt == pix_fmt)) { |
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return fmt_conversion_table[i].v4l2_fmt; |
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} |
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} |
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return 0; |
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} |
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static enum PixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum CodecID codec_id) |
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{ |
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int i; |
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for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { |
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if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt && |
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fmt_conversion_table[i].codec_id == codec_id) { |
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return fmt_conversion_table[i].ff_fmt; |
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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 fmt_v4l2codec(uint32_t v4l2_fmt) |
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{ |
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int i; |
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for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { |
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if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) { |
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return fmt_conversion_table[i].codec_id; |
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} |
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} |
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return CODEC_ID_NONE; |
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} |
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#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE |
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static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat) |
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{ |
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struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat }; |
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|
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while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) { |
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switch (vfse.type) { |
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case V4L2_FRMSIZE_TYPE_DISCRETE: |
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av_log(ctx, AV_LOG_INFO, " %ux%u", |
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vfse.discrete.width, vfse.discrete.height); |
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break; |
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case V4L2_FRMSIZE_TYPE_CONTINUOUS: |
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case V4L2_FRMSIZE_TYPE_STEPWISE: |
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av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}", |
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vfse.stepwise.min_width, |
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vfse.stepwise.max_width, |
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vfse.stepwise.step_width, |
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vfse.stepwise.min_height, |
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vfse.stepwise.max_height, |
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vfse.stepwise.step_height); |
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} |
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vfse.index++; |
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} |
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} |
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#endif |
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static void list_formats(AVFormatContext *ctx, int fd, int type) |
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{ |
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struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
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while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) { |
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enum CodecID codec_id = fmt_v4l2codec(vfd.pixelformat); |
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enum PixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id); |
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vfd.index++; |
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if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) && |
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type & V4L_RAWFORMATS) { |
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const char *fmt_name = av_get_pix_fmt_name(pix_fmt); |
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av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :", |
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fmt_name ? fmt_name : "Unsupported", |
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vfd.description); |
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} else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED && |
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type & V4L_COMPFORMATS) { |
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AVCodec *codec = avcodec_find_encoder(codec_id); |
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av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :", |
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codec ? codec->name : "Unsupported", |
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vfd.description); |
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} else { |
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continue; |
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} |
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#ifdef V4L2_FMT_FLAG_EMULATED |
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if (vfd.flags & V4L2_FMT_FLAG_EMULATED) { |
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av_log(ctx, AV_LOG_WARNING, "%s", "Emulated"); |
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continue; |
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} |
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#endif |
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#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE |
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list_framesizes(ctx, fd, vfd.pixelformat); |
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#endif |
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av_log(ctx, AV_LOG_INFO, "\n"); |
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} |
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} |
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static int mmap_init(AVFormatContext *ctx) |
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{ |
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int i, res; |
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struct video_data *s = ctx->priv_data; |
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struct v4l2_requestbuffers req = { |
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
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.count = desired_video_buffers, |
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.memory = V4L2_MEMORY_MMAP |
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}; |
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res = v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req); |
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if (res < 0) { |
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if (errno == EINVAL) { |
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av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n"); |
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} else { |
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n"); |
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} |
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return AVERROR(errno); |
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} |
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if (req.count < 2) { |
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av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n"); |
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return AVERROR(ENOMEM); |
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} |
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s->buffers = req.count; |
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s->buf_start = av_malloc(sizeof(void *) * s->buffers); |
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if (s->buf_start == NULL) { |
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av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n"); |
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return AVERROR(ENOMEM); |
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} |
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s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers); |
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if (s->buf_len == NULL) { |
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av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n"); |
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av_free(s->buf_start); |
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return AVERROR(ENOMEM); |
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} |
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for (i = 0; i < req.count; i++) { |
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struct v4l2_buffer buf = { |
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.type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
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.index = i, |
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.memory = V4L2_MEMORY_MMAP |
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}; |
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res = v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n"); |
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return AVERROR(errno); |
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} |
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s->buf_len[i] = buf.length; |
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if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) { |
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av_log(ctx, AV_LOG_ERROR, |
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"Buffer len [%d] = %d != %d\n", |
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i, s->buf_len[i], s->frame_size); |
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|
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return -1; |
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} |
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s->buf_start[i] = v4l2_mmap(NULL, buf.length, |
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PROT_READ | PROT_WRITE, MAP_SHARED, |
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s->fd, buf.m.offset); |
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|
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if (s->buf_start[i] == MAP_FAILED) { |
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av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno)); |
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return AVERROR(errno); |
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} |
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} |
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return 0; |
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} |
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|
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static void mmap_release_buffer(AVPacket *pkt) |
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{ |
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struct v4l2_buffer buf = { 0 }; |
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int res, fd; |
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struct buff_data *buf_descriptor = pkt->priv; |
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|
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if (pkt->data == NULL) |
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return; |
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|
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buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
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buf.memory = V4L2_MEMORY_MMAP; |
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buf.index = buf_descriptor->index; |
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fd = buf_descriptor->fd; |
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av_free(buf_descriptor); |
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|
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res = v4l2_ioctl(fd, VIDIOC_QBUF, &buf); |
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if (res < 0) |
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av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", |
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strerror(errno)); |
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|
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pkt->data = NULL; |
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pkt->size = 0; |
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} |
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|
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#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
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static int64_t av_gettime_monotonic(void) |
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{ |
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struct timespec tv; |
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|
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clock_gettime(CLOCK_MONOTONIC, &tv); |
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return (int64_t)tv.tv_sec * 1000000 + tv.tv_nsec / 1000; |
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} |
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#endif |
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|
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static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts) |
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{ |
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struct video_data *s = ctx->priv_data; |
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int64_t now; |
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|
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now = av_gettime(); |
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if (s->ts_mode == V4L_TS_ABS && |
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ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) { |
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av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n"); |
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s->ts_mode = V4L_TS_CONVERT_READY; |
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return 0; |
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} |
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#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
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now = av_gettime_monotonic(); |
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if (s->ts_mode == V4L_TS_MONO2ABS || |
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(ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) { |
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int64_t period = av_rescale_q(1, ctx->streams[0]->codec->time_base, |
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AV_TIME_BASE_Q); |
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av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n"); |
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/* microseconds instead of seconds, MHz instead of Hz */ |
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s->timefilter = ff_timefilter_new(1, period, 1.0E-6); |
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s->ts_mode = V4L_TS_CONVERT_READY; |
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return 0; |
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} |
|
#endif |
|
av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n"); |
|
return AVERROR(EIO); |
|
} |
|
|
|
static int convert_timestamp(AVFormatContext *ctx, int64_t *ts) |
|
{ |
|
struct video_data *s = ctx->priv_data; |
|
|
|
if (s->ts_mode) { |
|
int r = init_convert_timestamp(ctx, *ts); |
|
if (r < 0) |
|
return r; |
|
} |
|
#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
|
if (s->timefilter) { |
|
int64_t nowa = av_gettime(); |
|
int64_t nowm = av_gettime_monotonic(); |
|
ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m); |
|
s->last_time_m = nowm; |
|
*ts = ff_timefilter_eval(s->timefilter, *ts - nowm); |
|
} |
|
#endif |
|
return 0; |
|
} |
|
|
|
static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) |
|
{ |
|
struct video_data *s = ctx->priv_data; |
|
struct v4l2_buffer buf = { |
|
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
|
.memory = V4L2_MEMORY_MMAP |
|
}; |
|
struct buff_data *buf_descriptor; |
|
int res; |
|
|
|
/* FIXME: Some special treatment might be needed in case of loss of signal... */ |
|
while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR)); |
|
if (res < 0) { |
|
if (errno == EAGAIN) { |
|
pkt->size = 0; |
|
return AVERROR(EAGAIN); |
|
} |
|
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", |
|
strerror(errno)); |
|
|
|
return AVERROR(errno); |
|
} |
|
assert(buf.index < s->buffers); |
|
if (s->frame_size > 0 && buf.bytesused != s->frame_size) { |
|
av_log(ctx, AV_LOG_ERROR, |
|
"The v4l2 frame is %d bytes, but %d bytes are expected\n", |
|
buf.bytesused, s->frame_size); |
|
|
|
return AVERROR_INVALIDDATA; |
|
} |
|
|
|
/* Image is at s->buff_start[buf.index] */ |
|
pkt->data= s->buf_start[buf.index]; |
|
pkt->size = buf.bytesused; |
|
pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec; |
|
res = convert_timestamp(ctx, &pkt->pts); |
|
if (res < 0) |
|
return res; |
|
pkt->destruct = mmap_release_buffer; |
|
buf_descriptor = av_malloc(sizeof(struct buff_data)); |
|
if (buf_descriptor == NULL) { |
|
/* Something went wrong... Since av_malloc() failed, we cannot even |
|
* allocate a buffer for memcopying into it |
|
*/ |
|
av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n"); |
|
res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf); |
|
|
|
return AVERROR(ENOMEM); |
|
} |
|
buf_descriptor->fd = s->fd; |
|
buf_descriptor->index = buf.index; |
|
pkt->priv = buf_descriptor; |
|
|
|
return s->buf_len[buf.index]; |
|
} |
|
|
|
static int mmap_start(AVFormatContext *ctx) |
|
{ |
|
struct video_data *s = ctx->priv_data; |
|
enum v4l2_buf_type type; |
|
int i, res; |
|
|
|
for (i = 0; i < s->buffers; i++) { |
|
struct v4l2_buffer buf = { |
|
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
|
.index = i, |
|
.memory = V4L2_MEMORY_MMAP |
|
}; |
|
|
|
res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf); |
|
if (res < 0) { |
|
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", |
|
strerror(errno)); |
|
|
|
return AVERROR(errno); |
|
} |
|
} |
|
|
|
type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
|
res = v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type); |
|
if (res < 0) { |
|
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", |
|
strerror(errno)); |
|
|
|
return AVERROR(errno); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void mmap_close(struct video_data *s) |
|
{ |
|
enum v4l2_buf_type type; |
|
int i; |
|
|
|
type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
|
/* We do not check for the result, because we could |
|
* not do anything about it anyway... |
|
*/ |
|
v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type); |
|
for (i = 0; i < s->buffers; i++) { |
|
v4l2_munmap(s->buf_start[i], s->buf_len[i]); |
|
} |
|
av_free(s->buf_start); |
|
av_free(s->buf_len); |
|
} |
|
|
|
static int v4l2_set_parameters(AVFormatContext *s1) |
|
{ |
|
struct video_data *s = s1->priv_data; |
|
struct v4l2_input input = { 0 }; |
|
struct v4l2_standard standard = { 0 }; |
|
struct v4l2_streamparm streamparm = { 0 }; |
|
struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe; |
|
AVRational framerate_q = { 0 }; |
|
int i, ret; |
|
|
|
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
|
|
|
if (s->framerate && |
|
(ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) { |
|
av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", |
|
s->framerate); |
|
return ret; |
|
} |
|
|
|
/* set tv video input */ |
|
input.index = s->channel; |
|
if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) { |
|
av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n"); |
|
return AVERROR(EIO); |
|
} |
|
|
|
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n", |
|
s->channel, input.name); |
|
if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) { |
|
av_log(s1, AV_LOG_ERROR, |
|
"The V4L2 driver ioctl set input(%d) failed\n", |
|
s->channel); |
|
return AVERROR(EIO); |
|
} |
|
|
|
if (s->standard) { |
|
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n", |
|
s->standard); |
|
/* set tv standard */ |
|
for(i=0;;i++) { |
|
standard.index = i; |
|
ret = v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard); |
|
if (ret < 0 || !av_strcasecmp(standard.name, s->standard)) |
|
break; |
|
} |
|
if (ret < 0) { |
|
av_log(s1, AV_LOG_ERROR, "Unknown standard '%s'\n", s->standard); |
|
return ret; |
|
} |
|
|
|
av_log(s1, AV_LOG_DEBUG, |
|
"The V4L2 driver set standard: %s, id: %"PRIu64"\n", |
|
s->standard, (uint64_t)standard.id); |
|
if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { |
|
av_log(s1, AV_LOG_ERROR, |
|
"The V4L2 driver ioctl set standard(%s) failed\n", |
|
s->standard); |
|
return AVERROR(EIO); |
|
} |
|
} |
|
|
|
if (framerate_q.num && framerate_q.den) { |
|
av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n", |
|
framerate_q.den, framerate_q.num); |
|
tpf->numerator = framerate_q.den; |
|
tpf->denominator = framerate_q.num; |
|
|
|
if (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) { |
|
av_log(s1, AV_LOG_ERROR, |
|
"ioctl set time per frame(%d/%d) failed\n", |
|
framerate_q.den, framerate_q.num); |
|
return AVERROR(EIO); |
|
} |
|
|
|
if (framerate_q.num != tpf->denominator || |
|
framerate_q.den != tpf->numerator) { |
|
av_log(s1, AV_LOG_INFO, |
|
"The driver changed the time per frame from " |
|
"%d/%d to %d/%d\n", |
|
framerate_q.den, framerate_q.num, |
|
tpf->numerator, tpf->denominator); |
|
} |
|
} else { |
|
if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) { |
|
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", |
|
strerror(errno)); |
|
return AVERROR(errno); |
|
} |
|
} |
|
s1->streams[0]->codec->time_base.den = tpf->denominator; |
|
s1->streams[0]->codec->time_base.num = tpf->numerator; |
|
|
|
return 0; |
|
} |
|
|
|
static uint32_t device_try_init(AVFormatContext *s1, |
|
enum PixelFormat pix_fmt, |
|
int *width, |
|
int *height, |
|
enum CodecID *codec_id) |
|
{ |
|
uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id); |
|
|
|
if (desired_format == 0 || |
|
device_init(s1, width, height, desired_format) < 0) { |
|
int i; |
|
|
|
desired_format = 0; |
|
for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) { |
|
if (s1->video_codec_id == CODEC_ID_NONE || |
|
fmt_conversion_table[i].codec_id == s1->video_codec_id) { |
|
desired_format = fmt_conversion_table[i].v4l2_fmt; |
|
if (device_init(s1, width, height, desired_format) >= 0) { |
|
break; |
|
} |
|
desired_format = 0; |
|
} |
|
} |
|
} |
|
|
|
if (desired_format != 0) { |
|
*codec_id = fmt_v4l2codec(desired_format); |
|
assert(*codec_id != CODEC_ID_NONE); |
|
} |
|
|
|
return desired_format; |
|
} |
|
|
|
static int v4l2_read_header(AVFormatContext *s1) |
|
{ |
|
struct video_data *s = s1->priv_data; |
|
AVStream *st; |
|
int res = 0; |
|
uint32_t desired_format; |
|
enum CodecID codec_id; |
|
enum PixelFormat pix_fmt = PIX_FMT_NONE; |
|
|
|
st = avformat_new_stream(s1, NULL); |
|
if (!st) { |
|
res = AVERROR(ENOMEM); |
|
goto out; |
|
} |
|
|
|
s->fd = device_open(s1); |
|
if (s->fd < 0) { |
|
res = s->fd; |
|
goto out; |
|
} |
|
|
|
if (s->list_format) { |
|
list_formats(s1, s->fd, s->list_format); |
|
res = AVERROR_EXIT; |
|
goto out; |
|
} |
|
|
|
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
|
|
|
if (s->pixel_format) { |
|
AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format); |
|
|
|
if (codec) |
|
s1->video_codec_id = codec->id; |
|
|
|
pix_fmt = av_get_pix_fmt(s->pixel_format); |
|
|
|
if (pix_fmt == PIX_FMT_NONE && !codec) { |
|
av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n", |
|
s->pixel_format); |
|
|
|
res = AVERROR(EINVAL); |
|
goto out; |
|
} |
|
} |
|
|
|
if (!s->width && !s->height) { |
|
struct v4l2_format fmt; |
|
|
|
av_log(s1, AV_LOG_VERBOSE, |
|
"Querying the device for the current frame size\n"); |
|
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
|
if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { |
|
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", |
|
strerror(errno)); |
|
res = AVERROR(errno); |
|
goto out; |
|
} |
|
|
|
s->width = fmt.fmt.pix.width; |
|
s->height = fmt.fmt.pix.height; |
|
av_log(s1, AV_LOG_VERBOSE, |
|
"Setting frame size to %dx%d\n", s->width, s->height); |
|
} |
|
|
|
desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height, |
|
&codec_id); |
|
if (desired_format == 0) { |
|
av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for " |
|
"codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt); |
|
v4l2_close(s->fd); |
|
|
|
res = AVERROR(EIO); |
|
goto out; |
|
} |
|
if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0) |
|
goto out; |
|
|
|
s->frame_format = desired_format; |
|
|
|
if ((res = v4l2_set_parameters(s1)) < 0) |
|
goto out; |
|
|
|
st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id); |
|
s->frame_size = |
|
avpicture_get_size(st->codec->pix_fmt, s->width, s->height); |
|
|
|
if ((res = mmap_init(s1)) || |
|
(res = mmap_start(s1)) < 0) { |
|
v4l2_close(s->fd); |
|
goto out; |
|
} |
|
|
|
s->top_field_first = first_field(s->fd); |
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
|
st->codec->codec_id = codec_id; |
|
if (codec_id == CODEC_ID_RAWVIDEO) |
|
st->codec->codec_tag = |
|
avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt); |
|
if (desired_format == V4L2_PIX_FMT_YVU420) |
|
st->codec->codec_tag = MKTAG('Y', 'V', '1', '2'); |
|
st->codec->width = s->width; |
|
st->codec->height = s->height; |
|
st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8; |
|
|
|
out: |
|
return res; |
|
} |
|
|
|
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt) |
|
{ |
|
struct video_data *s = s1->priv_data; |
|
AVFrame *frame = s1->streams[0]->codec->coded_frame; |
|
int res; |
|
|
|
av_init_packet(pkt); |
|
if ((res = mmap_read_frame(s1, pkt)) < 0) { |
|
return res; |
|
} |
|
|
|
if (frame && s->interlaced) { |
|
frame->interlaced_frame = 1; |
|
frame->top_field_first = s->top_field_first; |
|
} |
|
|
|
return pkt->size; |
|
} |
|
|
|
static int v4l2_read_close(AVFormatContext *s1) |
|
{ |
|
struct video_data *s = s1->priv_data; |
|
|
|
mmap_close(s); |
|
|
|
v4l2_close(s->fd); |
|
return 0; |
|
} |
|
|
|
#define OFFSET(x) offsetof(struct video_data, x) |
|
#define DEC AV_OPT_FLAG_DECODING_PARAM |
|
|
|
static const AVOption options[] = { |
|
{ "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC }, |
|
{ "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC }, |
|
{ "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, |
|
{ "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
|
{ "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
|
{ "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
|
{ "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, DEC, "list_formats" }, |
|
{ "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" }, |
|
{ "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" }, |
|
{ "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.dbl = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" }, |
|
{ "timestamps", "Kind of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, 2, DEC, "timestamps" }, |
|
{ "default", "Use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.dbl = V4L_TS_DEFAULT }, 0, 2, DEC, "timestamps" }, |
|
{ "abs", "Use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.dbl = V4L_TS_ABS }, 0, 2, DEC, "timestamps" }, |
|
{ "mono2abs", "Force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.dbl = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" }, |
|
{ "ts", "Kind of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, 2, DEC, "timestamps" }, |
|
{ NULL }, |
|
}; |
|
|
|
static const AVClass v4l2_class = { |
|
.class_name = "V4L2 indev", |
|
.item_name = av_default_item_name, |
|
.option = options, |
|
.version = LIBAVUTIL_VERSION_INT, |
|
}; |
|
|
|
AVInputFormat ff_v4l2_demuxer = { |
|
.name = "video4linux2,v4l2", |
|
.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"), |
|
.priv_data_size = sizeof(struct video_data), |
|
.read_header = v4l2_read_header, |
|
.read_packet = v4l2_read_packet, |
|
.read_close = v4l2_read_close, |
|
.flags = AVFMT_NOFILE, |
|
.priv_class = &v4l2_class, |
|
};
|
|
|