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-rw-r--r--libavdevice/v4l.c363
1 files changed, 363 insertions, 0 deletions
diff --git a/libavdevice/v4l.c b/libavdevice/v4l.c
new file mode 100644
index 0000000000..e2f37d6d95
--- /dev/null
+++ b/libavdevice/v4l.c
@@ -0,0 +1,363 @@
+/*
+ * Linux video grab interface
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ *
+ * 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
+ */
+
+#include "avdevice.h"
+
+#undef __STRICT_ANSI__ //workaround due to broken kernel headers
+#include "config.h"
+#include "libavutil/rational.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
+#include "libavformat/internal.h"
+#include "libavcodec/dsputil.h"
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+#define _LINUX_TIME_H 1
+#include <linux/videodev.h>
+#include <time.h>
+#include "avdevice.h"
+
+typedef struct {
+ AVClass *class;
+ int fd;
+ int frame_format; /* see VIDEO_PALETTE_xxx */
+ int use_mmap;
+ AVRational time_base;
+ int64_t time_frame;
+ int frame_size;
+ struct video_capability video_cap;
+ struct video_audio audio_saved;
+ struct video_window video_win;
+ uint8_t *video_buf;
+ struct video_mbuf gb_buffers;
+ struct video_mmap gb_buf;
+ int gb_frame;
+ int standard;
+} VideoData;
+
+static const struct {
+ int palette;
+ int depth;
+ enum AVPixelFormat pix_fmt;
+} video_formats [] = {
+ {.palette = VIDEO_PALETTE_YUV420P, .depth = 12, .pix_fmt = AV_PIX_FMT_YUV420P },
+ {.palette = VIDEO_PALETTE_YUV422, .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
+ {.palette = VIDEO_PALETTE_UYVY, .depth = 16, .pix_fmt = AV_PIX_FMT_UYVY422 },
+ {.palette = VIDEO_PALETTE_YUYV, .depth = 16, .pix_fmt = AV_PIX_FMT_YUYV422 },
+ /* NOTE: v4l uses BGR24, not RGB24 */
+ {.palette = VIDEO_PALETTE_RGB24, .depth = 24, .pix_fmt = AV_PIX_FMT_BGR24 },
+ {.palette = VIDEO_PALETTE_RGB565, .depth = 16, .pix_fmt = AV_PIX_FMT_BGR565 },
+ {.palette = VIDEO_PALETTE_GREY, .depth = 8, .pix_fmt = AV_PIX_FMT_GRAY8 },
+};
+
+
+static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
+{
+ VideoData *s = s1->priv_data;
+ AVStream *st;
+ int video_fd;
+ int desired_palette, desired_depth;
+ struct video_tuner tuner;
+ struct video_audio audio;
+ struct video_picture pict;
+ int j;
+ int vformat_num = FF_ARRAY_ELEMS(video_formats);
+
+ av_log(s1, AV_LOG_WARNING, "V4L input device is deprecated and will be removed in the next release.");
+
+ if (ap->time_base.den <= 0) {
+ av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den);
+ return -1;
+ }
+ s->time_base = ap->time_base;
+
+ s->video_win.width = ap->width;
+ s->video_win.height = ap->height;
+
+ st = avformat_new_stream(s1, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+ avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
+
+ video_fd = open(s1->filename, O_RDWR);
+ if (video_fd < 0) {
+ av_log(s1, AV_LOG_ERROR, "%s: %s\n", s1->filename, strerror(errno));
+ goto fail;
+ }
+
+ if (ioctl(video_fd, VIDIOCGCAP, &s->video_cap) < 0) {
+ av_log(s1, AV_LOG_ERROR, "VIDIOCGCAP: %s\n", strerror(errno));
+ goto fail;
+ }
+
+ if (!(s->video_cap.type & VID_TYPE_CAPTURE)) {
+ av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n");
+ goto fail;
+ }
+
+ /* no values set, autodetect them */
+ if (s->video_win.width <= 0 || s->video_win.height <= 0) {
+ if (ioctl(video_fd, VIDIOCGWIN, &s->video_win, sizeof(s->video_win)) < 0) {
+ av_log(s1, AV_LOG_ERROR, "VIDIOCGWIN: %s\n", strerror(errno));
+ goto fail;
+ }
+ }
+
+ if(av_image_check_size(s->video_win.width, s->video_win.height, 0, s1) < 0)
+ return -1;
+
+ desired_palette = -1;
+ desired_depth = -1;
+ for (j = 0; j < vformat_num; j++) {
+ if (ap->pix_fmt == video_formats[j].pix_fmt) {
+ desired_palette = video_formats[j].palette;
+ desired_depth = video_formats[j].depth;
+ break;
+ }
+ }
+
+ /* set tv standard */
+ if (!ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
+ tuner.mode = s->standard;
+ ioctl(video_fd, VIDIOCSTUNER, &tuner);
+ }
+
+ /* unmute audio */
+ audio.audio = 0;
+ ioctl(video_fd, VIDIOCGAUDIO, &audio);
+ memcpy(&s->audio_saved, &audio, sizeof(audio));
+ audio.flags &= ~VIDEO_AUDIO_MUTE;
+ ioctl(video_fd, VIDIOCSAUDIO, &audio);
+
+ ioctl(video_fd, VIDIOCGPICT, &pict);
+ av_dlog(s1, "v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
+ pict.colour, pict.hue, pict.brightness, pict.contrast, pict.whiteness);
+ /* try to choose a suitable video format */
+ pict.palette = desired_palette;
+ pict.depth= desired_depth;
+ if (desired_palette == -1 || ioctl(video_fd, VIDIOCSPICT, &pict) < 0) {
+ for (j = 0; j < vformat_num; j++) {
+ pict.palette = video_formats[j].palette;
+ pict.depth = video_formats[j].depth;
+ if (-1 != ioctl(video_fd, VIDIOCSPICT, &pict))
+ break;
+ }
+ if (j >= vformat_num)
+ goto fail1;
+ }
+
+ if (ioctl(video_fd, VIDIOCGMBUF, &s->gb_buffers) < 0) {
+ /* try to use read based access */
+ int val;
+
+ s->video_win.x = 0;
+ s->video_win.y = 0;
+ s->video_win.chromakey = -1;
+ s->video_win.flags = 0;
+
+ if (ioctl(video_fd, VIDIOCSWIN, s->video_win) < 0) {
+ av_log(s1, AV_LOG_ERROR, "VIDIOCSWIN: %s\n", strerror(errno));
+ goto fail;
+ }
+
+ s->frame_format = pict.palette;
+
+ val = 1;
+ if (ioctl(video_fd, VIDIOCCAPTURE, &val) < 0) {
+ av_log(s1, AV_LOG_ERROR, "VIDIOCCAPTURE: %s\n", strerror(errno));
+ goto fail;
+ }
+
+ s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
+ s->use_mmap = 0;
+ } else {
+ s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_SHARED, video_fd, 0);
+ if ((unsigned char*)-1 == s->video_buf) {
+ s->video_buf = mmap(0, s->gb_buffers.size, PROT_READ|PROT_WRITE, MAP_PRIVATE, video_fd, 0);
+ if ((unsigned char*)-1 == s->video_buf) {
+ av_log(s1, AV_LOG_ERROR, "mmap: %s\n", strerror(errno));
+ goto fail;
+ }
+ }
+ s->gb_frame = 0;
+ s->time_frame = av_gettime() * s->time_base.den / s->time_base.num;
+
+ /* start to grab the first frame */
+ s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
+ s->gb_buf.height = s->video_win.height;
+ s->gb_buf.width = s->video_win.width;
+ s->gb_buf.format = pict.palette;
+
+ if (ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
+ if (errno != EAGAIN) {
+ fail1:
+ av_log(s1, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
+ } else {
+ av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not receive any video signal\n");
+ }
+ goto fail;
+ }
+ for (j = 1; j < s->gb_buffers.frames; j++) {
+ s->gb_buf.frame = j;
+ ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
+ }
+ s->frame_format = s->gb_buf.format;
+ s->use_mmap = 1;
+ }
+
+ for (j = 0; j < vformat_num; j++) {
+ if (s->frame_format == video_formats[j].palette) {
+ s->frame_size = s->video_win.width * s->video_win.height * video_formats[j].depth / 8;
+ st->codec->pix_fmt = video_formats[j].pix_fmt;
+ break;
+ }
+ }
+
+ if (j >= vformat_num)
+ goto fail;
+
+ s->fd = video_fd;
+
+ st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+ st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
+ st->codec->width = s->video_win.width;
+ st->codec->height = s->video_win.height;
+ st->codec->time_base = s->time_base;
+ st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8;
+
+ return 0;
+ fail:
+ if (video_fd >= 0)
+ close(video_fd);
+ return AVERROR(EIO);
+}
+
+static int v4l_mm_read_picture(VideoData *s, uint8_t *buf)
+{
+ uint8_t *ptr;
+
+ while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
+ (errno == EAGAIN || errno == EINTR));
+
+ ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
+ memcpy(buf, ptr, s->frame_size);
+
+ /* Setup to capture the next frame */
+ s->gb_buf.frame = s->gb_frame;
+ if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
+ if (errno == EAGAIN)
+ av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n");
+ else
+ av_log(NULL, AV_LOG_ERROR, "VIDIOCMCAPTURE: %s\n", strerror(errno));
+ return AVERROR(EIO);
+ }
+
+ /* This is now the grabbing frame */
+ s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames;
+
+ return s->frame_size;
+}
+
+static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
+{
+ VideoData *s = s1->priv_data;
+ int64_t curtime, delay;
+ struct timespec ts;
+
+ /* Calculate the time of the next frame */
+ s->time_frame += INT64_C(1000000);
+
+ /* wait based on the frame rate */
+ for(;;) {
+ curtime = av_gettime();
+ delay = s->time_frame * s->time_base.num / s->time_base.den - curtime;
+ if (delay <= 0) {
+ if (delay < INT64_C(-1000000) * s->time_base.num / s->time_base.den) {
+ /* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
+ s->time_frame += INT64_C(1000000);
+ }
+ break;
+ }
+ ts.tv_sec = delay / 1000000;
+ ts.tv_nsec = (delay % 1000000) * 1000;
+ nanosleep(&ts, NULL);
+ }
+
+ if (av_new_packet(pkt, s->frame_size) < 0)
+ return AVERROR(EIO);
+
+ pkt->pts = curtime;
+
+ /* read one frame */
+ if (s->use_mmap) {
+ return v4l_mm_read_picture(s, pkt->data);
+ } else {
+ if (read(s->fd, pkt->data, pkt->size) != pkt->size)
+ return AVERROR(EIO);
+ return s->frame_size;
+ }
+}
+
+static int grab_read_close(AVFormatContext *s1)
+{
+ VideoData *s = s1->priv_data;
+
+ if (s->use_mmap)
+ munmap(s->video_buf, s->gb_buffers.size);
+
+ /* mute audio. we must force it because the BTTV driver does not
+ return its state correctly */
+ s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
+ ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved);
+
+ close(s->fd);
+ return 0;
+}
+
+static const AVOption options[] = {
+ { "standard", "", offsetof(VideoData, standard), AV_OPT_TYPE_INT, {.i64 = VIDEO_MODE_NTSC}, VIDEO_MODE_PAL, VIDEO_MODE_NTSC, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+ { "PAL", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_PAL}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+ { "SECAM", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_SECAM}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+ { "NTSC", "", 0, AV_OPT_TYPE_CONST, {.i64 = VIDEO_MODE_NTSC}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "standard" },
+ { NULL },
+};
+
+static const AVClass v4l_class = {
+ .class_name = "V4L indev",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_v4l_demuxer = {
+ .name = "video4linux,v4l",
+ .long_name = NULL_IF_CONFIG_SMALL("Video4Linux device grab"),
+ .priv_data_size = sizeof(VideoData),
+ .read_header = grab_read_header,
+ .read_packet = grab_read_packet,
+ .read_close = grab_read_close,
+ .flags = AVFMT_NOFILE,
+ .priv_class = &v4l_class,
+};