diff options
Diffstat (limited to 'libavdevice/v4l2.c')
-rw-r--r-- | libavdevice/v4l2.c | 138 |
1 files changed, 79 insertions, 59 deletions
diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c index 191decde2a..29ec6afc49 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 Libav. + * This file is part of FFmpeg. * - * 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> @@ -40,17 +42,33 @@ #if HAVE_SYS_VIDEOIO_H #include <sys/videoio.h> #else +#if HAVE_ASM_TYPES_H +#include <asm/types.h> +#endif #include <linux/videodev2.h> #endif #include <time.h> #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" #include "libavutil/mathematics.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; #define V4L_ALLFORMATS 3 @@ -113,6 +131,9 @@ static int device_open(AVFormatContext *ctx) { struct v4l2_capability cap; int fd; +#if CONFIG_LIBV4L2 + int fd_libv4l; +#endif int res, err; int flags = O_RDWR; @@ -120,7 +141,7 @@ static int device_open(AVFormatContext *ctx) flags |= O_NONBLOCK; } - fd = open(ctx->filename, flags, 0); + fd = v4l2_open(ctx->filename, flags, 0); if (fd < 0) { err = errno; @@ -129,8 +150,18 @@ static int device_open(AVFormatContext *ctx) return AVERROR(err); } +#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); if (res < 0) { err = errno; av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", @@ -160,7 +191,7 @@ static int device_open(AVFormatContext *ctx) return fd; fail: - close(fd); + v4l2_close(fd); return AVERROR(err); } @@ -179,7 +210,7 @@ static int device_init(AVFormatContext *ctx, int *width, int *height, pix->pixelformat = pix_fmt; pix->field = V4L2_FIELD_ANY; - 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, @@ -210,7 +241,7 @@ 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; } @@ -339,34 +370,30 @@ static int mmap_init(AVFormatContext *ctx) .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); } @@ -376,11 +403,9 @@ static int mmap_init(AVFormatContext *ctx) .index = i, .memory = V4L2_MEMORY_MMAP }; - - 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); } @@ -392,13 +417,12 @@ 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); } } @@ -421,7 +445,7 @@ static void mmap_release_buffer(AVPacket *pkt) 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)); @@ -449,11 +473,10 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) return AVERROR(EAGAIN); /* 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", @@ -461,7 +484,7 @@ static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) 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", @@ -481,7 +504,7 @@ 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); } @@ -505,7 +528,7 @@ static int mmap_start(AVFormatContext *ctx) .memory = V4L2_MEMORY_MMAP }; - 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)); @@ -515,7 +538,7 @@ static int mmap_start(AVFormatContext *ctx) } 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)); @@ -535,9 +558,9 @@ 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); @@ -564,14 +587,14 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) /* set tv video 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); @@ -584,22 +607,19 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) /* set tv 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", - 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); @@ -613,7 +633,7 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) 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); @@ -629,7 +649,7 @@ static int v4l2_set_parameters(AVFormatContext *s1, AVFormatParameters *ap) tpf->numerator, tpf->denominator); } } else { - 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); @@ -737,7 +757,7 @@ 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); @@ -755,18 +775,17 @@ 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); @@ -775,7 +794,7 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap) if ((res = mmap_init(s1)) || (res = mmap_start(s1)) < 0) { - close(s->fd); + v4l2_close(s->fd); goto out; } @@ -819,12 +838,13 @@ 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", "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 }, @@ -847,7 +867,7 @@ 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, |