| /* |
| * Video4Linux2 grab interface |
| * Copyright (c) 2000,2001 Fabrice Bellard |
| * Copyright (c) 2006 Luca Abeni |
| * |
| * Part of this file is based on the V4L2 video capture example |
| * (http://v4l2spec.bytesex.org/v4l2spec/capture.c) |
| * |
| * Thanks to Michael Niedermayer for providing the mapping between |
| * V4L2_PIX_FMT_* and PIX_FMT_* |
| * |
| * |
| * 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 |
| */ |
| |
| #undef __STRICT_ANSI__ //workaround due to broken kernel headers |
| #include "config.h" |
| #include "libavformat/avformat.h" |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include <sys/mman.h> |
| #include <sys/time.h> |
| #if HAVE_SYS_VIDEOIO_H |
| #include <sys/videoio.h> |
| #else |
| #include <asm/types.h> |
| #include <linux/videodev2.h> |
| #endif |
| #include <time.h> |
| #include <strings.h> |
| |
| static const int desired_video_buffers = 256; |
| |
| enum io_method { |
| io_read, |
| io_mmap, |
| io_userptr |
| }; |
| |
| struct video_data { |
| int fd; |
| int frame_format; /* V4L2_PIX_FMT_* */ |
| enum io_method io_method; |
| int width, height; |
| int frame_size; |
| int top_field_first; |
| |
| int buffers; |
| void **buf_start; |
| unsigned int *buf_len; |
| }; |
| |
| struct buff_data { |
| int index; |
| int fd; |
| }; |
| |
| struct fmt_map { |
| enum PixelFormat ff_fmt; |
| int32_t v4l2_fmt; |
| }; |
| |
| static struct fmt_map fmt_conversion_table[] = { |
| { |
| .ff_fmt = PIX_FMT_YUV420P, |
| .v4l2_fmt = V4L2_PIX_FMT_YUV420, |
| }, |
| { |
| .ff_fmt = PIX_FMT_YUV422P, |
| .v4l2_fmt = V4L2_PIX_FMT_YUV422P, |
| }, |
| { |
| .ff_fmt = PIX_FMT_YUYV422, |
| .v4l2_fmt = V4L2_PIX_FMT_YUYV, |
| }, |
| { |
| .ff_fmt = PIX_FMT_UYVY422, |
| .v4l2_fmt = V4L2_PIX_FMT_UYVY, |
| }, |
| { |
| .ff_fmt = PIX_FMT_YUV411P, |
| .v4l2_fmt = V4L2_PIX_FMT_YUV411P, |
| }, |
| { |
| .ff_fmt = PIX_FMT_YUV410P, |
| .v4l2_fmt = V4L2_PIX_FMT_YUV410, |
| }, |
| { |
| .ff_fmt = PIX_FMT_RGB555, |
| .v4l2_fmt = V4L2_PIX_FMT_RGB555, |
| }, |
| { |
| .ff_fmt = PIX_FMT_RGB565, |
| .v4l2_fmt = V4L2_PIX_FMT_RGB565, |
| }, |
| { |
| .ff_fmt = PIX_FMT_BGR24, |
| .v4l2_fmt = V4L2_PIX_FMT_BGR24, |
| }, |
| { |
| .ff_fmt = PIX_FMT_RGB24, |
| .v4l2_fmt = V4L2_PIX_FMT_RGB24, |
| }, |
| { |
| .ff_fmt = PIX_FMT_BGRA, |
| .v4l2_fmt = V4L2_PIX_FMT_BGR32, |
| }, |
| { |
| .ff_fmt = PIX_FMT_GRAY8, |
| .v4l2_fmt = V4L2_PIX_FMT_GREY, |
| }, |
| }; |
| |
| static int device_open(AVFormatContext *ctx, uint32_t *capabilities) |
| { |
| struct v4l2_capability cap; |
| int fd; |
| int res; |
| int flags = O_RDWR; |
| |
| if (ctx->flags & AVFMT_FLAG_NONBLOCK) { |
| flags |= O_NONBLOCK; |
| } |
| fd = open(ctx->filename, flags, 0); |
| if (fd < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n", |
| ctx->filename, strerror(errno)); |
| |
| return -1; |
| } |
| |
| res = ioctl(fd, VIDIOC_QUERYCAP, &cap); |
| // ENOIOCTLCMD definition only availble on __KERNEL__ |
| if (res < 0 && errno == 515) |
| { |
| av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n"); |
| close(fd); |
| |
| return -1; |
| } |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", |
| strerror(errno)); |
| close(fd); |
| |
| return -1; |
| } |
| if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) { |
| av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n"); |
| close(fd); |
| |
| return -1; |
| } |
| *capabilities = cap.capabilities; |
| |
| return fd; |
| } |
| |
| static int device_init(AVFormatContext *ctx, int *width, int *height, int pix_fmt) |
| { |
| struct video_data *s = ctx->priv_data; |
| int fd = s->fd; |
| struct v4l2_format fmt; |
| int res; |
| |
| memset(&fmt, 0, sizeof(struct v4l2_format)); |
| fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| fmt.fmt.pix.width = *width; |
| fmt.fmt.pix.height = *height; |
| fmt.fmt.pix.pixelformat = pix_fmt; |
| fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; |
| res = ioctl(fd, VIDIOC_S_FMT, &fmt); |
| if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) { |
| av_log(ctx, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height); |
| *width = fmt.fmt.pix.width; |
| *height = fmt.fmt.pix.height; |
| } |
| |
| if (pix_fmt != fmt.fmt.pix.pixelformat) { |
| av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver changed the pixel format from 0x%08X to 0x%08X\n", pix_fmt, fmt.fmt.pix.pixelformat); |
| res = -1; |
| } |
| |
| return res; |
| } |
| |
| static int first_field(int fd) |
| { |
| int res; |
| v4l2_std_id std; |
| |
| res = ioctl(fd, VIDIOC_G_STD, &std); |
| if (res < 0) { |
| return 0; |
| } |
| if (std & V4L2_STD_NTSC) { |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt) |
| { |
| int i; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { |
| if (fmt_conversion_table[i].ff_fmt == pix_fmt) { |
| return fmt_conversion_table[i].v4l2_fmt; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static enum PixelFormat fmt_v4l2ff(uint32_t pix_fmt) |
| { |
| int i; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { |
| if (fmt_conversion_table[i].v4l2_fmt == pix_fmt) { |
| return fmt_conversion_table[i].ff_fmt; |
| } |
| } |
| |
| return PIX_FMT_NONE; |
| } |
| |
| static int mmap_init(AVFormatContext *ctx) |
| { |
| struct video_data *s = ctx->priv_data; |
| struct v4l2_requestbuffers req; |
| int i, res; |
| |
| memset(&req, 0, sizeof(struct v4l2_requestbuffers)); |
| req.count = desired_video_buffers; |
| req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| req.memory = V4L2_MEMORY_MMAP; |
| res = ioctl (s->fd, VIDIOC_REQBUFS, &req); |
| if (res < 0) { |
| if (errno == EINVAL) { |
| av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n"); |
| } else { |
| av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n"); |
| } |
| |
| return -1; |
| } |
| |
| if (req.count < 2) { |
| av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n"); |
| |
| return -1; |
| } |
| s->buffers = req.count; |
| s->buf_start = av_malloc(sizeof(void *) * s->buffers); |
| if (s->buf_start == NULL) { |
| av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n"); |
| |
| return -1; |
| } |
| s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers); |
| if (s->buf_len == NULL) { |
| av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n"); |
| av_free(s->buf_start); |
| |
| return -1; |
| } |
| |
| for (i = 0; i < req.count; i++) { |
| struct v4l2_buffer buf; |
| |
| memset(&buf, 0, sizeof(struct v4l2_buffer)); |
| buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buf.memory = V4L2_MEMORY_MMAP; |
| buf.index = i; |
| res = ioctl (s->fd, VIDIOC_QUERYBUF, &buf); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n"); |
| |
| return -1; |
| } |
| |
| s->buf_len[i] = buf.length; |
| if (s->buf_len[i] < s->frame_size) { |
| av_log(ctx, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size); |
| |
| return -1; |
| } |
| s->buf_start[i] = mmap (NULL, buf.length, |
| PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset); |
| if (s->buf_start[i] == MAP_FAILED) { |
| av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno)); |
| |
| return -1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int read_init(AVFormatContext *ctx) |
| { |
| return -1; |
| } |
| |
| static void mmap_release_buffer(AVPacket *pkt) |
| { |
| struct v4l2_buffer buf; |
| int res, fd; |
| struct buff_data *buf_descriptor = pkt->priv; |
| |
| if (pkt->data == NULL) { |
| return; |
| } |
| |
| memset(&buf, 0, sizeof(struct v4l2_buffer)); |
| buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buf.memory = V4L2_MEMORY_MMAP; |
| buf.index = buf_descriptor->index; |
| fd = buf_descriptor->fd; |
| av_free(buf_descriptor); |
| |
| res = ioctl (fd, VIDIOC_QBUF, &buf); |
| if (res < 0) { |
| av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n"); |
| } |
| pkt->data = NULL; |
| pkt->size = 0; |
| } |
| |
| static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) |
| { |
| struct video_data *s = ctx->priv_data; |
| struct v4l2_buffer buf; |
| struct buff_data *buf_descriptor; |
| int res; |
| |
| memset(&buf, 0, sizeof(struct v4l2_buffer)); |
| buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buf.memory = V4L2_MEMORY_MMAP; |
| |
| /* FIXME: Some special treatment might be needed in case of loss of signal... */ |
| while ((res = 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 -1; |
| } |
| assert (buf.index < s->buffers); |
| if (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 -1; |
| } |
| |
| /* 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; |
| 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 = ioctl (s->fd, VIDIOC_QBUF, &buf); |
| |
| return -1; |
| } |
| buf_descriptor->fd = s->fd; |
| buf_descriptor->index = buf.index; |
| pkt->priv = buf_descriptor; |
| |
| return s->buf_len[buf.index]; |
| } |
| |
| static int read_frame(AVFormatContext *ctx, AVPacket *pkt) |
| { |
| return -1; |
| } |
| |
| 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; |
| |
| memset(&buf, 0, sizeof(struct v4l2_buffer)); |
| buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| buf.memory = V4L2_MEMORY_MMAP; |
| buf.index = i; |
| |
| res = ioctl (s->fd, VIDIOC_QBUF, &buf); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno)); |
| |
| return -1; |
| } |
| } |
| |
| type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
| res = ioctl (s->fd, VIDIOC_STREAMON, &type); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno)); |
| |
| return -1; |
| } |
| |
| 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... |
| */ |
| ioctl(s->fd, VIDIOC_STREAMOFF, &type); |
| for (i = 0; i < s->buffers; i++) { |
| 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, AVFormatParameters *ap ) |
| { |
| struct video_data *s = s1->priv_data; |
| struct v4l2_input input; |
| struct v4l2_standard standard; |
| int i; |
| |
| if(ap->channel>=0) { |
| /* set tv video input */ |
| memset (&input, 0, sizeof (input)); |
| input.index = ap->channel; |
| if(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", |
| ap->channel, input.name); |
| if(ioctl (s->fd, VIDIOC_S_INPUT, &input.index) < 0 ) { |
| av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n", |
| ap->channel); |
| return AVERROR(EIO); |
| } |
| } |
| |
| if(ap->standard) { |
| av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n", |
| ap->standard ); |
| /* set tv standard */ |
| memset (&standard, 0, sizeof (standard)); |
| for(i=0;;i++) { |
| standard.index = i; |
| if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { |
| av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n", |
| ap->standard); |
| return AVERROR(EIO); |
| } |
| |
| if(!strcasecmp(standard.name, ap->standard)) { |
| break; |
| } |
| } |
| |
| av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n", |
| ap->standard, (uint64_t)standard.id); |
| if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { |
| av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n", |
| ap->standard); |
| return AVERROR(EIO); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap) |
| { |
| struct video_data *s = s1->priv_data; |
| AVStream *st; |
| int width, height; |
| int res; |
| uint32_t desired_format, capabilities; |
| |
| if (ap->width <= 0 || ap->height <= 0) { |
| av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", ap->width, ap->height); |
| return -1; |
| } |
| |
| width = ap->width; |
| height = ap->height; |
| |
| if(avcodec_check_dimensions(s1, ap->width, ap->height) < 0) |
| return -1; |
| |
| st = av_new_stream(s1, 0); |
| if (!st) { |
| return AVERROR(ENOMEM); |
| } |
| av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
| |
| s->width = width; |
| s->height = height; |
| |
| capabilities = 0; |
| s->fd = device_open(s1, &capabilities); |
| if (s->fd < 0) { |
| return AVERROR(EIO); |
| } |
| av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities); |
| |
| desired_format = fmt_ff2v4l(ap->pix_fmt); |
| if (desired_format == 0 || (device_init(s1, &width, &height, desired_format) < 0)) { |
| int i, done; |
| |
| done = 0; i = 0; |
| while (!done) { |
| desired_format = fmt_conversion_table[i].v4l2_fmt; |
| if (device_init(s1, &width, &height, desired_format) < 0) { |
| desired_format = 0; |
| i++; |
| } else { |
| done = 1; |
| } |
| if (i == FF_ARRAY_ELEMS(fmt_conversion_table)) { |
| done = 1; |
| } |
| } |
| } |
| if (desired_format == 0) { |
| av_log(s1, AV_LOG_ERROR, "Cannot find a proper format.\n"); |
| close(s->fd); |
| |
| return AVERROR(EIO); |
| } |
| s->frame_format = desired_format; |
| |
| if( v4l2_set_parameters( s1, ap ) < 0 ) |
| return AVERROR(EIO); |
| |
| st->codec->pix_fmt = fmt_v4l2ff(desired_format); |
| s->frame_size = avpicture_get_size(st->codec->pix_fmt, width, height); |
| if (capabilities & V4L2_CAP_STREAMING) { |
| s->io_method = io_mmap; |
| res = mmap_init(s1); |
| if (res == 0) { |
| res = mmap_start(s1); |
| } |
| } else { |
| s->io_method = io_read; |
| res = read_init(s1); |
| } |
| if (res < 0) { |
| close(s->fd); |
| |
| return AVERROR(EIO); |
| } |
| s->top_field_first = first_field(s->fd); |
| |
| st->codec->codec_type = CODEC_TYPE_VIDEO; |
| st->codec->codec_id = CODEC_ID_RAWVIDEO; |
| st->codec->width = width; |
| st->codec->height = height; |
| st->codec->time_base.den = ap->time_base.den; |
| st->codec->time_base.num = ap->time_base.num; |
| st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8; |
| |
| return 0; |
| } |
| |
| static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt) |
| { |
| struct video_data *s = s1->priv_data; |
| int res; |
| |
| if (s->io_method == io_mmap) { |
| av_init_packet(pkt); |
| res = mmap_read_frame(s1, pkt); |
| } else if (s->io_method == io_read) { |
| if (av_new_packet(pkt, s->frame_size) < 0) |
| return AVERROR(EIO); |
| |
| res = read_frame(s1, pkt); |
| } else { |
| return AVERROR(EIO); |
| } |
| if (res < 0) { |
| return res; |
| } |
| |
| if (s1->streams[0]->codec->coded_frame) { |
| s1->streams[0]->codec->coded_frame->interlaced_frame = 1; |
| s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first; |
| } |
| |
| return s->frame_size; |
| } |
| |
| static int v4l2_read_close(AVFormatContext *s1) |
| { |
| struct video_data *s = s1->priv_data; |
| |
| if (s->io_method == io_mmap) { |
| mmap_close(s); |
| } |
| |
| close(s->fd); |
| return 0; |
| } |
| |
| AVInputFormat v4l2_demuxer = { |
| "video4linux2", |
| NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"), |
| sizeof(struct video_data), |
| NULL, |
| v4l2_read_header, |
| v4l2_read_packet, |
| v4l2_read_close, |
| .flags = AVFMT_NOFILE, |
| }; |