diff options
Diffstat (limited to 'libavdevice/v4l2.c')
-rw-r--r-- | libavdevice/v4l2.c | 177 |
1 files changed, 91 insertions, 86 deletions
diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c index 0c61f46b53..dc54c4a205 100644 --- a/libavdevice/v4l2.c +++ b/libavdevice/v4l2.c @@ -1,35 +1,37 @@ /* - * 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. * - * - * This file is part of Libav. - * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +/** + * @file + * Video4Linux2 grab interface + * + * 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_* + */ + #undef __STRICT_ANSI__ //workaround due to broken kernel headers #include "config.h" -#include "libavformat/avformat.h" #include "libavformat/internal.h" #include <unistd.h> #include <fcntl.h> @@ -46,10 +48,23 @@ #include "libavutil/imgutils.h" #include "libavutil/log.h" #include "libavutil/opt.h" +#include "avdevice.h" #include "libavutil/parseutils.h" #include "libavutil/pixdesc.h" #include "libavutil/avstring.h" +#if CONFIG_LIBV4L2 +#include <libv4l2.h> +#else +#define v4l2_open open +#define v4l2_close close +#define v4l2_dup dup +#define v4l2_ioctl ioctl +#define v4l2_read read +#define v4l2_mmap mmap +#define v4l2_munmap munmap +#endif + static const int desired_video_buffers = 256; enum io_method { @@ -111,39 +126,49 @@ static int device_open(AVFormatContext *ctx, uint32_t *capabilities) { struct v4l2_capability cap; int fd; +#if CONFIG_LIBV4L2 + int fd_libv4l; +#endif int res, err; int flags = O_RDWR; if (ctx->flags & AVFMT_FLAG_NONBLOCK) { flags |= O_NONBLOCK; } - fd = open(ctx->filename, flags, 0); + fd = v4l2_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 AVERROR(errno); } +#if CONFIG_LIBV4L2 + fd_libv4l = v4l2_fd_open(fd, 0); + if (fd < 0) { + err = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "Cannot open video device with libv4l neither %s : %s\n", + ctx->filename, strerror(errno)); + return err; + } + fd = fd_libv4l; +#endif - res = ioctl(fd, VIDIOC_QUERYCAP, &cap); + res = v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap); // ENOIOCTLCMD definition only availble on __KERNEL__ if (res < 0 && ((err = errno) == 515)) { av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n"); - close(fd); + v4l2_close(fd); return AVERROR(515); } if (res < 0) { av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", strerror(errno)); - close(fd); - + v4l2_close(fd); return AVERROR(err); } if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) { av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n"); - close(fd); - + v4l2_close(fd); return AVERROR(ENODEV); } *capabilities = cap.capabilities; @@ -155,16 +180,15 @@ static int device_init(AVFormatContext *ctx, int *width, int *height, uint32_t p { struct video_data *s = ctx->priv_data; int fd = s->fd; - struct v4l2_format fmt; + struct v4l2_format fmt = {0}; 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); + res = v4l2_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; @@ -184,7 +208,7 @@ static int first_field(int fd) int res; v4l2_std_id std; - res = ioctl(fd, VIDIOC_G_STD, &std); + res = v4l2_ioctl(fd, VIDIOC_G_STD, &std); if (res < 0) { return 0; } @@ -241,55 +265,48 @@ static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt) static int mmap_init(AVFormatContext *ctx) { struct video_data *s = ctx->priv_data; - struct v4l2_requestbuffers req; + struct v4l2_requestbuffers req = {0}; 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); + res = v4l2_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 AVERROR(errno); } if (req.count < 2) { av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n"); - return AVERROR(ENOMEM); } 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 AVERROR(ENOMEM); } 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 AVERROR(ENOMEM); } for (i = 0; i < req.count; i++) { - struct v4l2_buffer buf; + struct v4l2_buffer buf = {0}; - 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); + res = v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n"); - return AVERROR(errno); } @@ -299,11 +316,10 @@ static int mmap_init(AVFormatContext *ctx) return -1; } - s->buf_start[i] = mmap (NULL, buf.length, + s->buf_start[i] = v4l2_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 AVERROR(errno); } } @@ -318,7 +334,7 @@ static int read_init(AVFormatContext *ctx) static void mmap_release_buffer(AVPacket *pkt) { - struct v4l2_buffer buf; + struct v4l2_buffer buf = {0}; int res, fd; struct buff_data *buf_descriptor = pkt->priv; @@ -326,14 +342,13 @@ static void mmap_release_buffer(AVPacket *pkt) 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); + res = v4l2_ioctl(fd, VIDIOC_QBUF, &buf); if (res < 0) { av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno)); } @@ -344,30 +359,27 @@ static void mmap_release_buffer(AVPacket *pkt) static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) { struct video_data *s = ctx->priv_data; - struct v4l2_buffer buf; + struct v4l2_buffer buf = {0}; 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)); + 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); + 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; } @@ -382,7 +394,7 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) * 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); + res = v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf); return AVERROR(ENOMEM); } @@ -405,26 +417,23 @@ static int mmap_start(AVFormatContext *ctx) int i, res; for (i = 0; i < s->buffers; i++) { - struct v4l2_buffer buf; + struct v4l2_buffer buf = {0}; - 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); + 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 = ioctl(s->fd, VIDIOC_STREAMON, &type); + 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); } @@ -440,9 +449,9 @@ static void mmap_close(struct video_data *s) /* We do not check for the result, because we could * not do anything about it anyway... */ - ioctl(s->fd, VIDIOC_STREAMOFF, &type); + v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type); for (i = 0; i < s->buffers; i++) { - munmap(s->buf_start[i], s->buf_len[i]); + v4l2_munmap(s->buf_start[i], s->buf_len[i]); } av_free(s->buf_start); av_free(s->buf_len); @@ -451,12 +460,12 @@ static void mmap_close(struct video_data *s) static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) { struct video_data *s = s1->priv_data; - struct v4l2_input input; - struct v4l2_standard standard; - struct v4l2_streamparm streamparm = { 0 }; + struct v4l2_input input = {0}; + struct v4l2_standard standard = {0}; + struct v4l2_streamparm streamparm = {0}; struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe; int i, ret; - AVRational framerate_q; + AVRational framerate_q={0}; streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; @@ -466,16 +475,15 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) } /* set tv video input */ - memset (&input, 0, sizeof (input)); input.index = s->channel; - if (ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) { + 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 (ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) { + 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); @@ -485,23 +493,20 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n", s->standard); /* set tv standard */ - memset (&standard, 0, sizeof (standard)); - for(i=0;;i++) { + 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", - s->standard); - return AVERROR(EIO); - } - - if (!av_strcasecmp(standard.name, s->standard)) { + 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 (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { + 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); @@ -513,7 +518,7 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) framerate_q.den, framerate_q.num); tpf->numerator = framerate_q.den; tpf->denominator = framerate_q.num; - if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) { + 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); @@ -529,7 +534,7 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) } } else { /* if timebase value is not set, read the timebase value from the driver */ - if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) { + 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); } @@ -611,7 +616,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap) av_log(s1, AV_LOG_VERBOSE, "Querying the device for the current frame size\n"); fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { + 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; @@ -625,16 +630,16 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap) 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); - close(s->fd); + v4l2_close(s->fd); res = AVERROR(EIO); goto out; } - if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0)) + 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, ap) < 0)) + if ((res = v4l2_set_parameters(s1, ap)) < 0) goto out; st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id); @@ -650,8 +655,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap) res = read_init(s1); } if (res < 0) { - close(s->fd); - + v4l2_close(s->fd); res = AVERROR(EIO); goto out; } @@ -703,15 +707,16 @@ static int v4l2_read_close(AVFormatContext *s1) mmap_close(s); } - close(s->fd); + 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", "", offsetof(struct video_data, standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, - { "channel", "", offsetof(struct video_data, channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, + { "standard", "", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM }, + { "channel", "", OFFSET(channel), AV_OPT_TYPE_INT, {.dbl = 0 }, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, { "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, @@ -726,7 +731,7 @@ static const AVClass v4l2_class = { }; AVInputFormat ff_v4l2_demuxer = { - .name = "video4linux2", + .name = "video4linux2,v4l2", .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"), .priv_data_size = sizeof(struct video_data), .read_header = v4l2_read_header, |