0,0 → 1,1031 |
/* |
* Copyright (c) 2000,2001 Fabrice Bellard |
* Copyright (c) 2006 Luca Abeni |
* |
* 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 |
*/ |
|
/** |
* @file |
* Video4Linux2 grab interface |
* |
* Part of this file is based on the V4L2 video capture example |
* (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html) |
* |
* Thanks to Michael Niedermayer for providing the mapping between |
* V4L2_PIX_FMT_* and AV_PIX_FMT_* |
*/ |
|
#include "v4l2-common.h" |
|
#if CONFIG_LIBV4L2 |
#include <libv4l2.h> |
#endif |
|
static const int desired_video_buffers = 256; |
|
#define V4L_ALLFORMATS 3 |
#define V4L_RAWFORMATS 1 |
#define V4L_COMPFORMATS 2 |
|
/** |
* Return timestamps to the user exactly as returned by the kernel |
*/ |
#define V4L_TS_DEFAULT 0 |
/** |
* Autodetect the kind of timestamps returned by the kernel and convert to |
* absolute (wall clock) timestamps. |
*/ |
#define V4L_TS_ABS 1 |
/** |
* Assume kernel timestamps are from the monotonic clock and convert to |
* absolute timestamps. |
*/ |
#define V4L_TS_MONO2ABS 2 |
|
/** |
* Once the kind of timestamps returned by the kernel have been detected, |
* the value of the timefilter (NULL or not) determines whether a conversion |
* takes place. |
*/ |
#define V4L_TS_CONVERT_READY V4L_TS_DEFAULT |
|
struct video_data { |
AVClass *class; |
int fd; |
int frame_format; /* V4L2_PIX_FMT_* */ |
int width, height; |
int frame_size; |
int interlaced; |
int top_field_first; |
int ts_mode; |
TimeFilter *timefilter; |
int64_t last_time_m; |
|
int buffers; |
volatile int buffers_queued; |
void **buf_start; |
unsigned int *buf_len; |
char *standard; |
v4l2_std_id std_id; |
int channel; |
char *pixel_format; /**< Set by a private option. */ |
int list_format; /**< Set by a private option. */ |
int list_standard; /**< Set by a private option. */ |
char *framerate; /**< Set by a private option. */ |
|
int use_libv4l2; |
int (*open_f)(const char *file, int oflag, ...); |
int (*close_f)(int fd); |
int (*dup_f)(int fd); |
int (*ioctl_f)(int fd, unsigned long int request, ...); |
ssize_t (*read_f)(int fd, void *buffer, size_t n); |
void *(*mmap_f)(void *start, size_t length, int prot, int flags, int fd, int64_t offset); |
int (*munmap_f)(void *_start, size_t length); |
}; |
|
struct buff_data { |
struct video_data *s; |
int index; |
}; |
|
static int device_open(AVFormatContext *ctx) |
{ |
struct video_data *s = ctx->priv_data; |
struct v4l2_capability cap; |
int fd; |
int ret; |
int flags = O_RDWR; |
|
#define SET_WRAPPERS(prefix) do { \ |
s->open_f = prefix ## open; \ |
s->close_f = prefix ## close; \ |
s->dup_f = prefix ## dup; \ |
s->ioctl_f = prefix ## ioctl; \ |
s->read_f = prefix ## read; \ |
s->mmap_f = prefix ## mmap; \ |
s->munmap_f = prefix ## munmap; \ |
} while (0) |
|
if (s->use_libv4l2) { |
#if CONFIG_LIBV4L2 |
SET_WRAPPERS(v4l2_); |
#else |
av_log(ctx, AV_LOG_ERROR, "libavdevice is not build with libv4l2 support.\n"); |
return AVERROR(EINVAL); |
#endif |
} else { |
SET_WRAPPERS(); |
} |
|
#define v4l2_open s->open_f |
#define v4l2_close s->close_f |
#define v4l2_dup s->dup_f |
#define v4l2_ioctl s->ioctl_f |
#define v4l2_read s->read_f |
#define v4l2_mmap s->mmap_f |
#define v4l2_munmap s->munmap_f |
|
if (ctx->flags & AVFMT_FLAG_NONBLOCK) { |
flags |= O_NONBLOCK; |
} |
|
fd = v4l2_open(ctx->filename, flags, 0); |
if (fd < 0) { |
ret = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n", |
ctx->filename, av_err2str(ret)); |
return ret; |
} |
|
if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) { |
ret = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", |
av_err2str(ret)); |
goto fail; |
} |
|
av_log(ctx, AV_LOG_VERBOSE, "fd:%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"); |
ret = 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"); |
ret = AVERROR(ENOSYS); |
goto fail; |
} |
|
return fd; |
|
fail: |
v4l2_close(fd); |
return ret; |
} |
|
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 = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
struct v4l2_pix_format *pix = &fmt.fmt.pix; |
|
int res = 0; |
|
pix->width = *width; |
pix->height = *height; |
pix->pixelformat = pix_fmt; |
pix->field = V4L2_FIELD_ANY; |
|
if (v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt) < 0) |
res = AVERROR(errno); |
|
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 = AVERROR(EINVAL); |
} |
|
if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) { |
av_log(ctx, AV_LOG_DEBUG, |
"The V4L2 driver is using the interlaced mode\n"); |
s->interlaced = 1; |
} |
|
return res; |
} |
|
static int first_field(const struct video_data *s, int fd) |
{ |
int res; |
v4l2_std_id std; |
|
res = v4l2_ioctl(fd, VIDIOC_G_STD, &std); |
if (res < 0) { |
return 0; |
} |
if (std & V4L2_STD_NTSC) { |
return 0; |
} |
|
return 1; |
} |
|
#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE |
static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat) |
{ |
const struct video_data *s = ctx->priv_data; |
struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat }; |
|
while(!v4l2_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) |
{ |
const struct video_data *s = ctx->priv_data; |
struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
|
while(!v4l2_ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) { |
enum AVCodecID codec_id = avpriv_fmt_v4l2codec(vfd.pixelformat); |
enum AVPixelFormat pix_fmt = avpriv_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, "Raw : %9s : %20s :", |
fmt_name ? fmt_name : "Unsupported", |
vfd.description); |
} else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED && |
type & V4L_COMPFORMATS) { |
AVCodec *codec = avcodec_find_decoder(codec_id); |
av_log(ctx, AV_LOG_INFO, "Compressed: %9s : %20s :", |
codec ? codec->name : "Unsupported", |
vfd.description); |
} else { |
continue; |
} |
|
#ifdef V4L2_FMT_FLAG_EMULATED |
if (vfd.flags & V4L2_FMT_FLAG_EMULATED) |
av_log(ctx, AV_LOG_INFO, " Emulated :"); |
#endif |
#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE |
list_framesizes(ctx, fd, vfd.pixelformat); |
#endif |
av_log(ctx, AV_LOG_INFO, "\n"); |
} |
} |
|
static void list_standards(AVFormatContext *ctx) |
{ |
int ret; |
struct video_data *s = ctx->priv_data; |
struct v4l2_standard standard; |
|
if (s->std_id == 0) |
return; |
|
for (standard.index = 0; ; standard.index++) { |
if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { |
ret = AVERROR(errno); |
if (ret == AVERROR(EINVAL)) { |
break; |
} else { |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret)); |
return; |
} |
} |
av_log(ctx, AV_LOG_INFO, "%2d, %16"PRIx64", %s\n", |
standard.index, (uint64_t)standard.id, standard.name); |
} |
} |
|
static int mmap_init(AVFormatContext *ctx) |
{ |
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 |
}; |
|
if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) { |
res = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res)); |
return res; |
} |
|
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 = { |
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
.index = i, |
.memory = V4L2_MEMORY_MMAP |
}; |
if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) { |
res = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res)); |
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, |
"buf_len[%d] = %d < expected frame size %d\n", |
i, s->buf_len[i], s->frame_size); |
return AVERROR(ENOMEM); |
} |
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) { |
res = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res)); |
return res; |
} |
} |
|
return 0; |
} |
|
#if FF_API_DESTRUCT_PACKET |
static void dummy_release_buffer(AVPacket *pkt) |
{ |
av_assert0(0); |
} |
#endif |
|
static void mmap_release_buffer(void *opaque, uint8_t *data) |
{ |
struct v4l2_buffer buf = { 0 }; |
int res; |
struct buff_data *buf_descriptor = opaque; |
struct video_data *s = buf_descriptor->s; |
|
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
buf.memory = V4L2_MEMORY_MMAP; |
buf.index = buf_descriptor->index; |
av_free(buf_descriptor); |
|
if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) { |
res = AVERROR(errno); |
av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", |
av_err2str(res)); |
} |
|
avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); |
} |
|
#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
static int64_t av_gettime_monotonic(void) |
{ |
struct timespec tv; |
|
clock_gettime(CLOCK_MONOTONIC, &tv); |
return (int64_t)tv.tv_sec * 1000000 + tv.tv_nsec / 1000; |
} |
#endif |
|
static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts) |
{ |
struct video_data *s = ctx->priv_data; |
int64_t now; |
|
now = av_gettime(); |
if (s->ts_mode == V4L_TS_ABS && |
ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) { |
av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n"); |
s->ts_mode = V4L_TS_CONVERT_READY; |
return 0; |
} |
#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
now = av_gettime_monotonic(); |
if (s->ts_mode == V4L_TS_MONO2ABS || |
(ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) { |
AVRational tb = {AV_TIME_BASE, 1}; |
int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate); |
av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n"); |
/* microseconds instead of seconds, MHz instead of Hz */ |
s->timefilter = ff_timefilter_new(1, period, 1.0E-6); |
if (!s->timefilter) |
return AVERROR(ENOMEM); |
s->ts_mode = V4L_TS_CONVERT_READY; |
return 0; |
} |
#endif |
av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n"); |
return AVERROR(EIO); |
} |
|
static int convert_timestamp(AVFormatContext *ctx, int64_t *ts) |
{ |
struct video_data *s = ctx->priv_data; |
|
if (s->ts_mode) { |
int r = init_convert_timestamp(ctx, *ts); |
if (r < 0) |
return r; |
} |
#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) |
if (s->timefilter) { |
int64_t nowa = av_gettime(); |
int64_t nowm = av_gettime_monotonic(); |
ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m); |
s->last_time_m = nowm; |
*ts = ff_timefilter_eval(s->timefilter, *ts - nowm); |
} |
#endif |
return 0; |
} |
|
static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) |
{ |
struct video_data *s = ctx->priv_data; |
struct v4l2_buffer buf = { |
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
.memory = V4L2_MEMORY_MMAP |
}; |
int res; |
|
/* FIXME: Some special treatment might be needed in case of loss of signal... */ |
while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR)); |
if (res < 0) { |
if (errno == EAGAIN) { |
pkt->size = 0; |
return AVERROR(EAGAIN); |
} |
res = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", av_err2str(res)); |
return res; |
} |
|
if (buf.index >= s->buffers) { |
av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n"); |
return AVERROR(EINVAL); |
} |
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); |
|
/* CPIA is a compressed format and we don't know the exact number of bytes |
* used by a frame, so set it here as the driver announces it. |
*/ |
if (ctx->video_codec_id == AV_CODEC_ID_CPIA) |
s->frame_size = buf.bytesused; |
|
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; |
} |
|
/* Image is at s->buff_start[buf.index] */ |
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"); |
if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0) |
avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); |
return res; |
} |
memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused); |
|
if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) { |
res = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res)); |
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 == NULL) { |
/* 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"); |
if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0) |
avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); |
|
return AVERROR(ENOMEM); |
} |
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_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n"); |
if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0) |
avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); |
av_freep(&buf_descriptor); |
return AVERROR(ENOMEM); |
} |
} |
pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec; |
convert_timestamp(ctx, &pkt->pts); |
|
return s->buf_len[buf.index]; |
} |
|
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 = { |
.type = V4L2_BUF_TYPE_VIDEO_CAPTURE, |
.index = i, |
.memory = V4L2_MEMORY_MMAP |
}; |
|
if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) { |
res = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res)); |
return res; |
} |
} |
s->buffers_queued = s->buffers; |
|
type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) { |
res = AVERROR(errno); |
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", av_err2str(res)); |
return res; |
} |
|
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... |
*/ |
v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type); |
for (i = 0; i < s->buffers; i++) { |
v4l2_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) |
{ |
struct video_data *s = s1->priv_data; |
struct v4l2_standard standard = { 0 }; |
struct v4l2_streamparm streamparm = { 0 }; |
struct v4l2_fract *tpf; |
AVRational framerate_q = { 0 }; |
int i, ret; |
|
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; |
} |
|
if (s->standard) { |
if (s->std_id) { |
ret = 0; |
av_log(s1, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard); |
/* set tv standard */ |
for (i = 0; ; i++) { |
standard.index = i; |
if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { |
ret = AVERROR(errno); |
break; |
} |
if (!av_strcasecmp(standard.name, s->standard)) |
break; |
} |
if (ret < 0) { |
av_log(s1, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard); |
return ret; |
} |
|
if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { |
ret = AVERROR(errno); |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret)); |
return ret; |
} |
} else { |
av_log(s1, AV_LOG_WARNING, |
"This device does not support any standard\n"); |
} |
} |
|
/* get standard */ |
if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) { |
tpf = &standard.frameperiod; |
for (i = 0; ; i++) { |
standard.index = i; |
if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { |
ret = AVERROR(errno); |
if (ret == AVERROR(EINVAL)) { |
tpf = &streamparm.parm.capture.timeperframe; |
break; |
} |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret)); |
return ret; |
} |
if (standard.id == s->std_id) { |
av_log(s1, AV_LOG_DEBUG, |
"Current standard: %s, id: %"PRIx64", frameperiod: %d/%d\n", |
standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator); |
break; |
} |
} |
} else { |
tpf = &streamparm.parm.capture.timeperframe; |
} |
|
streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; |
if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) { |
ret = AVERROR(errno); |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret)); |
return ret; |
} |
|
if (framerate_q.num && framerate_q.den) { |
if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) { |
tpf = &streamparm.parm.capture.timeperframe; |
|
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 (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) { |
ret = AVERROR(errno); |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n", av_err2str(ret)); |
return ret; |
} |
|
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 { |
av_log(s1, AV_LOG_WARNING, |
"The driver does not allow to change time per frame\n"); |
} |
} |
s1->streams[0]->avg_frame_rate.num = tpf->denominator; |
s1->streams[0]->avg_frame_rate.den = tpf->numerator; |
s1->streams[0]->r_frame_rate = s1->streams[0]->avg_frame_rate; |
|
return 0; |
} |
|
static int device_try_init(AVFormatContext *s1, |
enum AVPixelFormat pix_fmt, |
int *width, |
int *height, |
uint32_t *desired_format, |
enum AVCodecID *codec_id) |
{ |
int ret, i; |
|
*desired_format = avpriv_fmt_ff2v4l(pix_fmt, s1->video_codec_id); |
|
if (*desired_format) { |
ret = device_init(s1, width, height, *desired_format); |
if (ret < 0) { |
*desired_format = 0; |
if (ret != AVERROR(EINVAL)) |
return ret; |
} |
} |
|
if (!*desired_format) { |
for (i = 0; avpriv_fmt_conversion_table[i].codec_id != AV_CODEC_ID_NONE; i++) { |
if (s1->video_codec_id == AV_CODEC_ID_NONE || |
avpriv_fmt_conversion_table[i].codec_id == s1->video_codec_id) { |
av_log(s1, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n", |
avcodec_get_name(avpriv_fmt_conversion_table[i].codec_id), |
(char *)av_x_if_null(av_get_pix_fmt_name(avpriv_fmt_conversion_table[i].ff_fmt), "none")); |
|
*desired_format = avpriv_fmt_conversion_table[i].v4l2_fmt; |
ret = device_init(s1, width, height, *desired_format); |
if (ret >= 0) |
break; |
else if (ret != AVERROR(EINVAL)) |
return ret; |
*desired_format = 0; |
} |
} |
|
if (*desired_format == 0) { |
av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for " |
"codec '%s' (id %d), pixel format '%s' (id %d)\n", |
avcodec_get_name(s1->video_codec_id), s1->video_codec_id, |
(char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt); |
ret = AVERROR(EINVAL); |
} |
} |
|
*codec_id = avpriv_fmt_v4l2codec(*desired_format); |
av_assert0(*codec_id != AV_CODEC_ID_NONE); |
return ret; |
} |
|
static int v4l2_read_header(AVFormatContext *s1) |
{ |
struct video_data *s = s1->priv_data; |
AVStream *st; |
int res = 0; |
uint32_t desired_format; |
enum AVCodecID codec_id = AV_CODEC_ID_NONE; |
enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE; |
struct v4l2_input input = { 0 }; |
|
st = avformat_new_stream(s1, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
|
#if CONFIG_LIBV4L2 |
/* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL |
and errors will get sent to stderr */ |
if (s->use_libv4l2) |
v4l2_log_file = fopen("/dev/null", "w"); |
#endif |
|
s->fd = device_open(s1); |
if (s->fd < 0) |
return s->fd; |
|
if (s->channel != -1) { |
/* set video input */ |
av_log(s1, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel); |
if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) { |
res = AVERROR(errno); |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res)); |
return res; |
} |
} else { |
/* get current video input */ |
if (v4l2_ioctl(s->fd, VIDIOC_G_INPUT, &s->channel) < 0) { |
res = AVERROR(errno); |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_INPUT): %s\n", av_err2str(res)); |
return res; |
} |
} |
|
/* enum input */ |
input.index = s->channel; |
if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) { |
res = AVERROR(errno); |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res)); |
return res; |
} |
s->std_id = input.std; |
av_log(s1, AV_LOG_DEBUG, "Current input_channel: %d, input_name: %s, input_std: %"PRIx64"\n", |
s->channel, input.name, (uint64_t)input.std); |
|
if (s->list_format) { |
list_formats(s1, s->fd, s->list_format); |
return AVERROR_EXIT; |
} |
|
if (s->list_standard) { |
list_standards(s1); |
return AVERROR_EXIT; |
} |
|
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ |
|
if (s->pixel_format) { |
AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format); |
|
if (codec) |
s1->video_codec_id = codec->id; |
|
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); |
} |
} |
|
if (!s->width && !s->height) { |
struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; |
|
av_log(s1, AV_LOG_VERBOSE, |
"Querying the device for the current frame size\n"); |
if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { |
res = AVERROR(errno); |
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res)); |
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); |
} |
|
res = device_try_init(s1, pix_fmt, &s->width, &s->height, &desired_format, &codec_id); |
if (res < 0) { |
v4l2_close(s->fd); |
return res; |
} |
|
/* If no pixel_format was specified, the codec_id was not known up |
* until now. Set video_codec_id in the context, as codec_id will |
* not be available outside this function |
*/ |
if (codec_id != AV_CODEC_ID_NONE && s1->video_codec_id == AV_CODEC_ID_NONE) |
s1->video_codec_id = codec_id; |
|
if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0) |
return res; |
|
s->frame_format = desired_format; |
|
if ((res = v4l2_set_parameters(s1)) < 0) |
return res; |
|
st->codec->pix_fmt = avpriv_fmt_v4l2ff(desired_format, codec_id); |
s->frame_size = |
avpicture_get_size(st->codec->pix_fmt, s->width, s->height); |
|
if ((res = mmap_init(s1)) || |
(res = mmap_start(s1)) < 0) { |
v4l2_close(s->fd); |
return res; |
} |
|
s->top_field_first = first_field(s, s->fd); |
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
st->codec->codec_id = codec_id; |
if (codec_id == AV_CODEC_ID_RAWVIDEO) |
st->codec->codec_tag = |
avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt); |
else if (codec_id == AV_CODEC_ID_H264) { |
st->need_parsing = AVSTREAM_PARSE_HEADERS; |
} |
if (desired_format == V4L2_PIX_FMT_YVU420) |
st->codec->codec_tag = MKTAG('Y', 'V', '1', '2'); |
else if (desired_format == V4L2_PIX_FMT_YVU410) |
st->codec->codec_tag = MKTAG('Y', 'V', 'U', '9'); |
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; |
AVFrame *frame = s1->streams[0]->codec->coded_frame; |
int res; |
|
av_init_packet(pkt); |
if ((res = mmap_read_frame(s1, pkt)) < 0) { |
return res; |
} |
|
if (frame && s->interlaced) { |
frame->interlaced_frame = 1; |
frame->top_field_first = s->top_field_first; |
} |
|
return pkt->size; |
} |
|
static int v4l2_read_close(AVFormatContext *s1) |
{ |
struct video_data *s = s1->priv_data; |
|
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); |
|
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", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC }, |
{ "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, INT_MAX, DEC }, |
{ "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, |
{ "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
{ "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
{ "framerate", "set frame rate", 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" }, |
|
{ "list_standards", "list supported standards and exit", OFFSET(list_standard), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC, "list_standards" }, |
{ "all", "show all supported standards", OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, DEC, "list_standards" }, |
|
{ "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" }, |
{ "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" }, |
{ "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, "timestamps" }, |
{ "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, "timestamps" }, |
{ "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" }, |
{ "use_libv4l2", "use libv4l2 (v4l-utils) convertion functions", OFFSET(use_libv4l2), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC }, |
{ 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,v4l2", |
.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, |
}; |