* (http://v4l2spec.bytesex.org/v4l2spec/capture.c)
*
* Thanks to Michael Niedermayer for providing the mapping between
- * V4L2_PIX_FMT_* and PIX_FMT_*
+ * V4L2_PIX_FMT_* and AV_PIX_FMT_*
*
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; 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 "libavformat/internal.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
+#include <poll.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>
+#include "libavutil/atomic.h"
+#include "libavutil/avassert.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/internal.h"
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/avstring.h"
+#include "libavutil/mathematics.h"
static const int desired_video_buffers = 256;
-enum io_method {
- io_read,
- io_mmap,
- io_userptr
-};
+#define V4L_ALLFORMATS 3
+#define V4L_RAWFORMATS 1
+#define V4L_COMPFORMATS 2
struct video_data {
+ AVClass *class;
int fd;
int frame_format; /* V4L2_PIX_FMT_* */
- enum io_method io_method;
int width, height;
int frame_size;
+ int timeout;
+ int interlaced;
int top_field_first;
int buffers;
+ volatile int buffers_queued;
void **buf_start;
unsigned int *buf_len;
+ char *standard;
+ int channel;
+ char *video_size; /**< String describing video size,
+ set by a private option. */
+ char *pixel_format; /**< Set by a private option. */
+ int list_format; /**< Set by a private option. */
+ char *framerate; /**< Set by a private option. */
};
struct buff_data {
+ struct video_data *s;
int index;
int fd;
};
struct fmt_map {
- enum PixelFormat ff_fmt;
- enum CodecID codec_id;
+ enum AVPixelFormat ff_fmt;
+ enum AVCodecID codec_id;
uint32_t v4l2_fmt;
};
static struct fmt_map fmt_conversion_table[] = {
- {
- .ff_fmt = PIX_FMT_YUV420P,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_YUV420,
- },
- {
- .ff_fmt = PIX_FMT_YUV422P,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_YUV422P,
- },
- {
- .ff_fmt = PIX_FMT_YUYV422,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_YUYV,
- },
- {
- .ff_fmt = PIX_FMT_UYVY422,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_UYVY,
- },
- {
- .ff_fmt = PIX_FMT_YUV411P,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_YUV411P,
- },
- {
- .ff_fmt = PIX_FMT_YUV410P,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_YUV410,
- },
- {
- .ff_fmt = PIX_FMT_RGB555,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_RGB555,
- },
- {
- .ff_fmt = PIX_FMT_RGB565,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_RGB565,
- },
- {
- .ff_fmt = PIX_FMT_BGR24,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_BGR24,
- },
- {
- .ff_fmt = PIX_FMT_RGB24,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_RGB24,
- },
- {
- .ff_fmt = PIX_FMT_BGRA,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_BGR32,
- },
- {
- .ff_fmt = PIX_FMT_GRAY8,
- .codec_id = CODEC_ID_RAWVIDEO,
- .v4l2_fmt = V4L2_PIX_FMT_GREY,
- },
- {
- .ff_fmt = PIX_FMT_NONE,
- .codec_id = CODEC_ID_MJPEG,
- .v4l2_fmt = V4L2_PIX_FMT_MJPEG,
- },
- {
- .ff_fmt = PIX_FMT_NONE,
- .codec_id = CODEC_ID_MJPEG,
- .v4l2_fmt = V4L2_PIX_FMT_JPEG,
- },
+ //ff_fmt codec_id v4l2_fmt
+ { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 },
+ { AV_PIX_FMT_YUV422P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P },
+ { AV_PIX_FMT_YUYV422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV },
+ { AV_PIX_FMT_UYVY422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY },
+ { AV_PIX_FMT_YUV411P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P },
+ { AV_PIX_FMT_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 },
+ { AV_PIX_FMT_RGB555, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 },
+ { AV_PIX_FMT_RGB565, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 },
+ { AV_PIX_FMT_BGR24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 },
+ { AV_PIX_FMT_RGB24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 },
+ { AV_PIX_FMT_BGRA, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 },
+ { AV_PIX_FMT_GRAY8, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY },
+ { AV_PIX_FMT_NV12, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 },
+ { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG },
+ { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG },
+#ifdef V4L2_PIX_FMT_H264
+ { AV_PIX_FMT_NONE, AV_CODEC_ID_H264, V4L2_PIX_FMT_H264 },
+#endif
};
-static int device_open(AVFormatContext *ctx, uint32_t *capabilities)
+static int device_open(AVFormatContext *ctx)
{
struct v4l2_capability cap;
int fd;
- int res;
+ int res, err;
int flags = O_RDWR;
+ char errbuf[128];
if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
flags |= O_NONBLOCK;
}
- fd = open(ctx->filename, flags, 0);
+
+ fd = avpriv_open(ctx->filename, flags);
if (fd < 0) {
+ err = AVERROR(errno);
+ av_strerror(err, errbuf, sizeof(errbuf));
+
av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n",
- ctx->filename, strerror(errno));
+ ctx->filename, errbuf);
- return -1;
+ return err;
}
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) {
+ err = AVERROR(errno);
+ av_strerror(err, errbuf, sizeof(errbuf));
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n",
- strerror(errno));
- close(fd);
+ errbuf);
- return -1;
+ goto fail;
}
- if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) {
- av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n");
- close(fd);
- return -1;
+ av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n",
+ fd, cap.capabilities);
+
+ if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
+ av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n");
+ err = AVERROR(ENODEV);
+
+ goto fail;
+ }
+
+ if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
+ av_log(ctx, AV_LOG_ERROR,
+ "The device does not support the streaming I/O method.\n");
+ err = AVERROR(ENOSYS);
+
+ goto fail;
}
- *capabilities = cap.capabilities;
return fd;
+
+fail:
+ close(fd);
+ return err;
}
-static int device_init(AVFormatContext *ctx, int *width, int *height, uint32_t pix_fmt)
+static int device_init(AVFormatContext *ctx, int *width, int *height,
+ uint32_t pix_fmt)
{
struct video_data *s = ctx->priv_data;
int fd = s->fd;
- struct v4l2_format fmt;
+ struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
+ struct v4l2_pix_format *pix = &fmt.fmt.pix;
+
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;
+ pix->width = *width;
+ pix->height = *height;
+ pix->pixelformat = pix_fmt;
+ pix->field = V4L2_FIELD_ANY;
+
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);
+ 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);
+ 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;
}
+ if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) {
+ av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode");
+ s->interlaced = 1;
+ }
+
return res;
}
return 1;
}
-static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt, enum CodecID codec_id)
+static uint32_t fmt_ff2v4l(enum AVPixelFormat pix_fmt, enum AVCodecID codec_id)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
- if ((codec_id == CODEC_ID_NONE ||
+ if ((codec_id == AV_CODEC_ID_NONE ||
fmt_conversion_table[i].codec_id == codec_id) &&
- (pix_fmt == PIX_FMT_NONE ||
+ (pix_fmt == AV_PIX_FMT_NONE ||
fmt_conversion_table[i].ff_fmt == pix_fmt)) {
return fmt_conversion_table[i].v4l2_fmt;
}
return 0;
}
-static enum PixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum CodecID codec_id)
+static enum AVPixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID codec_id)
{
int i;
}
}
- return PIX_FMT_NONE;
+ return AV_PIX_FMT_NONE;
}
-static enum CodecID fmt_v4l2codec(uint32_t v4l2_fmt)
+static enum AVCodecID fmt_v4l2codec(uint32_t v4l2_fmt)
{
int i;
}
}
- return CODEC_ID_NONE;
+ return AV_CODEC_ID_NONE;
+}
+
+#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
+static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat)
+{
+ struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat };
+
+ while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) {
+ switch (vfse.type) {
+ case V4L2_FRMSIZE_TYPE_DISCRETE:
+ av_log(ctx, AV_LOG_INFO, " %ux%u",
+ vfse.discrete.width, vfse.discrete.height);
+ break;
+ case V4L2_FRMSIZE_TYPE_CONTINUOUS:
+ case V4L2_FRMSIZE_TYPE_STEPWISE:
+ av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}",
+ vfse.stepwise.min_width,
+ vfse.stepwise.max_width,
+ vfse.stepwise.step_width,
+ vfse.stepwise.min_height,
+ vfse.stepwise.max_height,
+ vfse.stepwise.step_height);
+ }
+ vfse.index++;
+ }
+}
+#endif
+
+static void list_formats(AVFormatContext *ctx, int fd, int type)
+{
+ struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE };
+
+ while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) {
+ enum AVCodecID codec_id = fmt_v4l2codec(vfd.pixelformat);
+ enum AVPixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id);
+
+ vfd.index++;
+
+ if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) &&
+ type & V4L_RAWFORMATS) {
+ const char *fmt_name = av_get_pix_fmt_name(pix_fmt);
+ av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :",
+ fmt_name ? fmt_name : "Unsupported",
+ vfd.description);
+ } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED &&
+ type & V4L_COMPFORMATS) {
+ const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
+ av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :",
+ desc ? desc->name : "Unsupported",
+ vfd.description);
+ } else {
+ continue;
+ }
+
+#ifdef V4L2_FMT_FLAG_EMULATED
+ if (vfd.flags & V4L2_FMT_FLAG_EMULATED) {
+ av_log(ctx, AV_LOG_WARNING, "%s", "Emulated");
+ continue;
+ }
+#endif
+#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE
+ list_framesizes(ctx, fd, vfd.pixelformat);
+#endif
+ av_log(ctx, AV_LOG_INFO, "\n");
+ }
}
static int mmap_init(AVFormatContext *ctx)
{
- struct video_data *s = ctx->priv_data;
- struct v4l2_requestbuffers req;
int i, res;
+ struct video_data *s = ctx->priv_data;
+ struct v4l2_requestbuffers req = {
+ .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+ .count = desired_video_buffers,
+ .memory = V4L2_MEMORY_MMAP
+ };
- 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 = ioctl(s->fd, VIDIOC_REQBUFS, &req);
if (res < 0) {
- if (errno == EINVAL) {
+ res = AVERROR(errno);
+ if (res == AVERROR(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;
+ return res;
}
if (req.count < 2) {
av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n");
- return -1;
+ return AVERROR(ENOMEM);
}
s->buffers = req.count;
s->buf_start = av_malloc(sizeof(void *) * s->buffers);
- if (s->buf_start == NULL) {
+ if (!s->buf_start) {
av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n");
- return -1;
+ return AVERROR(ENOMEM);
}
s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers);
- if (s->buf_len == NULL) {
+ if (!s->buf_len) {
av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n");
av_free(s->buf_start);
- return -1;
+ return AVERROR(ENOMEM);
}
for (i = 0; i < req.count; i++) {
- struct v4l2_buffer buf;
+ struct v4l2_buffer buf = {
+ .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+ .index = i,
+ .memory = V4L2_MEMORY_MMAP
+ };
- 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 = ioctl(s->fd, VIDIOC_QUERYBUF, &buf);
if (res < 0) {
+ res = AVERROR(errno);
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n");
- return -1;
+ return res;
}
s->buf_len[i] = buf.length;
if (s->frame_size > 0 && 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);
+ 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);
+ 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));
+ char errbuf[128];
+ res = AVERROR(errno);
+ av_strerror(res, errbuf, sizeof(errbuf));
+ av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", errbuf);
- return -1;
+ return res;
}
}
return 0;
}
-static int read_init(AVFormatContext *ctx)
+#if FF_API_DESTRUCT_PACKET
+static void dummy_release_buffer(AVPacket *pkt)
{
- return -1;
+ av_assert0(0);
}
+#endif
-static void mmap_release_buffer(AVPacket *pkt)
+static void mmap_release_buffer(void *opaque, uint8_t *data)
{
- struct v4l2_buffer buf;
+ struct v4l2_buffer buf = { 0 };
int res, fd;
- struct buff_data *buf_descriptor = pkt->priv;
-
- if (pkt->data == NULL) {
- return;
- }
+ struct buff_data *buf_descriptor = opaque;
+ struct video_data *s = buf_descriptor->s;
+ char errbuf[128];
- 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 = ioctl(fd, VIDIOC_QBUF, &buf);
if (res < 0) {
- av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
+ av_strerror(AVERROR(errno), errbuf, sizeof(errbuf));
+ av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
+ errbuf);
}
- pkt->data = NULL;
- pkt->size = 0;
+ avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
}
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;
+ struct v4l2_buffer buf = {
+ .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+ .memory = V4L2_MEMORY_MMAP
+ };
+ struct pollfd p = { .fd = s->fd, .events = POLLIN };
int res;
- memset(&buf, 0, sizeof(struct v4l2_buffer));
- buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_MMAP;
+ res = poll(&p, 1, s->timeout);
+ if (res < 0)
+ return AVERROR(errno);
+
+ if (!(p.revents & (POLLIN | POLLERR | POLLHUP)))
+ 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));
if (res < 0) {
+ char errbuf[128];
if (errno == EAGAIN) {
pkt->size = 0;
return AVERROR(EAGAIN);
}
- av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno));
+ res = AVERROR(errno);
+ av_strerror(res, errbuf, sizeof(errbuf));
+ av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n",
+ errbuf);
+
+ return res;
+ }
- return -1;
+ if (buf.index >= s->buffers) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n");
+ return AVERROR(EINVAL);
}
- assert (buf.index < s->buffers);
+ avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1);
+ // always keep at least one buffer queued
+ av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1);
+
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);
+ 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;
+ 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;
- 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);
+ if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) {
+ /* when we start getting low on queued buffers, fall back on copying data */
+ res = av_new_packet(pkt, buf.bytesused);
+ if (res < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n");
+ return res;
+ }
+ memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused);
- return -1;
+ res = ioctl(s->fd, VIDIOC_QBUF, &buf);
+ if (res < 0) {
+ res = AVERROR(errno);
+ av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
+ av_free_packet(pkt);
+ return res;
+ }
+ avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1);
+ } else {
+ struct buff_data *buf_descriptor;
+
+ pkt->data = s->buf_start[buf.index];
+ pkt->size = buf.bytesused;
+#if FF_API_DESTRUCT_PACKET
+FF_DISABLE_DEPRECATION_WARNINGS
+ pkt->destruct = dummy_release_buffer;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+
+ buf_descriptor = av_malloc(sizeof(struct buff_data));
+ if (!buf_descriptor) {
+ /* Something went wrong... Since av_malloc() failed, we cannot even
+ * allocate a buffer for memcpying into it
+ */
+ av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
+ res = ioctl(s->fd, VIDIOC_QBUF, &buf);
+
+ return AVERROR(ENOMEM);
+ }
+ buf_descriptor->fd = s->fd;
+ buf_descriptor->index = buf.index;
+ buf_descriptor->s = s;
+
+ pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer,
+ buf_descriptor, 0);
+ if (!pkt->buf) {
+ av_freep(&buf_descriptor);
+ return AVERROR(ENOMEM);
+ }
}
- buf_descriptor->fd = s->fd;
- buf_descriptor->index = buf.index;
- pkt->priv = buf_descriptor;
+ pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
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;
+ int i, res, err;
+ char errbuf[128];
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;
+ struct v4l2_buffer buf = {
+ .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+ .index = i,
+ .memory = V4L2_MEMORY_MMAP
+ };
- res = ioctl (s->fd, VIDIOC_QBUF, &buf);
+ res = ioctl(s->fd, VIDIOC_QBUF, &buf);
if (res < 0) {
- av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno));
+ err = AVERROR(errno);
+ av_strerror(err, errbuf, sizeof(errbuf));
+ av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n",
+ errbuf);
- return -1;
+ return err;
}
}
+ s->buffers_queued = s->buffers;
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- res = ioctl (s->fd, VIDIOC_STREAMON, &type);
+ res = ioctl(s->fd, VIDIOC_STREAMON, &type);
if (res < 0) {
- av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno));
+ err = AVERROR(errno);
+ av_strerror(err, errbuf, sizeof(errbuf));
+ av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n",
+ errbuf);
- return -1;
+ return err;
}
return 0;
av_free(s->buf_len);
}
-static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap )
+static int v4l2_set_parameters(AVFormatContext *s1)
{
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);
- }
+ 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 (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);
- }
+ 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) {
+ av_log(s1, AV_LOG_ERROR,
+ "The V4L2 driver ioctl set input(%d) failed\n",
+ s->channel);
+ return AVERROR(EIO);
}
- if(ap->standard) {
+ if (s->standard) {
av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n",
- ap->standard );
+ s->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);
+ av_log(s1, AV_LOG_ERROR,
+ "The V4L2 driver ioctl set standard(%s) failed\n",
+ s->standard);
return AVERROR(EIO);
}
- if(!strcasecmp(standard.name, ap->standard)) {
+ if (!av_strcasecmp(standard.name, s->standard)) {
break;
}
}
- av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n",
- ap->standard, (uint64_t)standard.id);
+ 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) {
- av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n",
- ap->standard);
+ 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 (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 (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) {
+ char errbuf[128];
+ ret = AVERROR(errno);
+ av_strerror(ret, errbuf, sizeof(errbuf));
+ av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n",
+ errbuf);
+ return ret;
+ }
}
+ s1->streams[0]->avg_frame_rate.num = tpf->denominator;
+ s1->streams[0]->avg_frame_rate.den = tpf->numerator;
+
+ s->timeout = 100 +
+ av_rescale_q(1, s1->streams[0]->avg_frame_rate,
+ (AVRational){1, 1000});
return 0;
}
static uint32_t device_try_init(AVFormatContext *s1,
- const AVFormatParameters *ap,
+ enum AVPixelFormat pix_fmt,
int *width,
int *height,
- enum CodecID *codec_id)
+ enum AVCodecID *codec_id)
{
- uint32_t desired_format = fmt_ff2v4l(ap->pix_fmt, s1->video_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) {
desired_format = 0;
for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) {
- if (s1->video_codec_id == CODEC_ID_NONE ||
+ if (s1->video_codec_id == AV_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) {
}
}
}
+
if (desired_format != 0) {
*codec_id = fmt_v4l2codec(desired_format);
- assert(*codec_id != CODEC_ID_NONE);
+ assert(*codec_id != AV_CODEC_ID_NONE);
}
return desired_format;
}
-static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
+static int v4l2_read_header(AVFormatContext *s1)
{
struct video_data *s = s1->priv_data;
AVStream *st;
- int width, height;
- int res;
- uint32_t desired_format, capabilities;
- enum CodecID codec_id;
+ int res = 0;
+ uint32_t desired_format;
+ enum AVCodecID codec_id;
+ enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE;
- if (ap->width <= 0 || ap->height <= 0) {
- av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", ap->width, ap->height);
- return -1;
+ st = avformat_new_stream(s1, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ s->fd = device_open(s1);
+ if (s->fd < 0)
+ return s->fd;
+
+ if (s->list_format) {
+ list_formats(s1, s->fd, s->list_format);
+ return AVERROR_EXIT;
+ }
+
+ avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
+
+ if (s->video_size &&
+ (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) {
+ av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n",
+ s->video_size);
+ return res;
}
- width = ap->width;
- height = ap->height;
+ if (s->pixel_format) {
+ AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format);
- if(avcodec_check_dimensions(s1, ap->width, ap->height) < 0)
- return -1;
+ if (codec) {
+ s1->video_codec_id = codec->id;
+ st->need_parsing = AVSTREAM_PARSE_HEADERS;
+ }
- st = av_new_stream(s1, 0);
- if (!st) {
- return AVERROR(ENOMEM);
+ pix_fmt = av_get_pix_fmt(s->pixel_format);
+
+ if (pix_fmt == AV_PIX_FMT_NONE && !codec) {
+ av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n",
+ s->pixel_format);
+
+ return AVERROR(EINVAL);
+ }
}
- av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
- s->width = width;
- s->height = height;
+ if (!s->width && !s->height) {
+ struct v4l2_format fmt;
- capabilities = 0;
- s->fd = device_open(s1, &capabilities);
- if (s->fd < 0) {
- return AVERROR(EIO);
+ 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) {
+ char errbuf[128];
+ res = AVERROR(errno);
+ av_strerror(res, errbuf, sizeof(errbuf));
+ av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n",
+ errbuf);
+ return res;
+ }
+
+ 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);
}
- av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities);
- desired_format = device_try_init(s1, ap, &width, &height, &codec_id);
+ 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, ap->pix_fmt);
+ "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt);
close(s->fd);
return AVERROR(EIO);
}
+
+ if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0))
+ return res;
+
s->frame_format = desired_format;
- if( v4l2_set_parameters( s1, ap ) < 0 )
- return AVERROR(EIO);
+ if ((res = v4l2_set_parameters(s1) < 0))
+ return res;
st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id);
- 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);
+ s->frame_size =
+ avpicture_get_size(st->codec->pix_fmt, s->width, s->height);
- return AVERROR(EIO);
+ if ((res = mmap_init(s1)) ||
+ (res = mmap_start(s1)) < 0) {
+ close(s->fd);
+ return res;
}
+
s->top_field_first = first_field(s->fd);
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = codec_id;
- 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;
+ if (codec_id == AV_CODEC_ID_RAWVIDEO)
+ st->codec->codec_tag =
+ avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
+ st->codec->width = s->width;
+ st->codec->height = s->height;
+ st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8;
return 0;
}
static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
{
struct video_data *s = s1->priv_data;
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+ AVFrame *frame = s1->streams[0]->codec->coded_frame;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
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) {
+ av_init_packet(pkt);
+ if ((res = mmap_read_frame(s1, pkt)) < 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;
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+ if (frame && s->interlaced) {
+ frame->interlaced_frame = 1;
+ frame->top_field_first = s->top_field_first;
}
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
return pkt->size;
}
{
struct video_data *s = s1->priv_data;
- if (s->io_method == io_mmap) {
- mmap_close(s);
- }
+ if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers)
+ av_log(s1, AV_LOG_WARNING, "Some buffers are still owned by the caller on "
+ "close.\n");
+
+ 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,
+#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, {.i64 = 0 }, 0, INT_MAX, DEC },
+ { "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", "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, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" },
+ { "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" },
+ { "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" },
+ { "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" },
+ { 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",
+ .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,
};
projects / ffmpeg / blobdiff