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v4l2_request.c
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v4l2_request.c
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/*
* 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 <drm_fourcc.h>
#include <linux/media.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/sysmacros.h>
#include <libudev.h>
#include "decode.h"
#include "internal.h"
#include "v4l2_request.h"
#ifndef DRM_FORMAT_NV15
#define DRM_FORMAT_NV15 fourcc_code('N', 'V', '1', '5')
#endif
#ifndef DRM_FORMAT_NV20
#define DRM_FORMAT_NV20 fourcc_code('N', 'V', '2', '0')
#endif
uint64_t ff_v4l2_request_get_capture_timestamp(AVFrame *frame)
{
V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
return req ? v4l2_timeval_to_ns(&req->capture.buffer.timestamp) : 0;
}
int ff_v4l2_request_reset_frame(AVCodecContext *avctx, AVFrame *frame)
{
V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
memset(&req->drm, 0, sizeof(AVDRMFrameDescriptor));
req->output.used = 0;
return 0;
}
int ff_v4l2_request_append_output_buffer(AVCodecContext *avctx, AVFrame *frame, const uint8_t *data, uint32_t size)
{
V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
if (req->output.used + size + (AV_INPUT_BUFFER_PADDING_SIZE * 4) <= req->output.size) {
memcpy(req->output.addr + req->output.used, data, size);
req->output.used += size;
} else {
av_log(avctx, AV_LOG_ERROR, "%s: output.used=%u output.size=%u size=%u\n", __func__, req->output.used, req->output.size, size);
}
return 0;
}
static int v4l2_request_controls(V4L2RequestContext *ctx, int request_fd, unsigned long type, struct v4l2_ext_control *control, int count)
{
struct v4l2_ext_controls controls = {
.controls = control,
.count = count,
.request_fd = request_fd,
.which = (request_fd >= 0) ? V4L2_CTRL_WHICH_REQUEST_VAL : 0,
};
if (!control || !count)
return 0;
return ioctl(ctx->video_fd, type, &controls);
}
static int v4l2_request_set_controls(V4L2RequestContext *ctx, int request_fd, struct v4l2_ext_control *control, int count)
{
return v4l2_request_controls(ctx, request_fd, VIDIOC_S_EXT_CTRLS, control, count);
}
int ff_v4l2_request_set_controls(AVCodecContext *avctx, struct v4l2_ext_control *control, int count)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret;
ret = v4l2_request_controls(ctx, -1, VIDIOC_S_EXT_CTRLS, control, count);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: set controls failed, %s (%d)\n", __func__, strerror(errno), errno);
return AVERROR(EINVAL);
}
return ret;
}
int ff_v4l2_request_get_controls(AVCodecContext *avctx, struct v4l2_ext_control *control, int count)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret;
ret = v4l2_request_controls(ctx, -1, VIDIOC_G_EXT_CTRLS, control, count);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get controls failed, %s (%d)\n", __func__, strerror(errno), errno);
return AVERROR(EINVAL);
}
return ret;
}
int ff_v4l2_request_query_control(AVCodecContext *avctx, struct v4l2_query_ext_ctrl *control)
{
int ret;
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
ret = ioctl(ctx->video_fd, VIDIOC_QUERY_EXT_CTRL, control);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: query control failed, %s (%d)\n", __func__, strerror(errno), errno);
return AVERROR(EINVAL);
}
return 0;
}
int ff_v4l2_request_query_control_default_value(AVCodecContext *avctx, uint32_t id)
{
int ret;
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
struct v4l2_queryctrl control = {
.id = id,
};
ret = ioctl(ctx->video_fd, VIDIOC_QUERYCTRL, &control);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: query control failed, %s (%d)\n", __func__, strerror(errno), errno);
return AVERROR(EINVAL);
}
return control.default_value;
}
static int v4l2_request_queue_buffer(V4L2RequestContext *ctx, int request_fd, V4L2RequestBuffer *buf, uint32_t flags)
{
struct v4l2_plane planes[1] = {};
struct v4l2_buffer buffer = {
.type = buf->buffer.type,
.memory = buf->buffer.memory,
.index = buf->index,
.timestamp.tv_usec = ctx->timestamp,
.bytesused = buf->used,
.request_fd = request_fd,
.flags = ((request_fd >= 0) ? V4L2_BUF_FLAG_REQUEST_FD : 0) | flags,
};
buf->buffer.timestamp = buffer.timestamp;
if (V4L2_TYPE_IS_MULTIPLANAR(buf->buffer.type)) {
planes[0].bytesused = buf->used;
buffer.bytesused = 0;
buffer.length = 1;
buffer.m.planes = planes;
}
return ioctl(ctx->video_fd, VIDIOC_QBUF, &buffer);
}
static int v4l2_request_dequeue_buffer(V4L2RequestContext *ctx, V4L2RequestBuffer *buf)
{
int ret;
struct v4l2_plane planes[1] = {};
struct v4l2_buffer buffer = {
.type = buf->buffer.type,
.memory = buf->buffer.memory,
.index = buf->index,
};
if (V4L2_TYPE_IS_MULTIPLANAR(buf->buffer.type)) {
buffer.length = 1;
buffer.m.planes = planes;
}
ret = ioctl(ctx->video_fd, VIDIOC_DQBUF, &buffer);
if (ret < 0)
return ret;
buf->buffer.timestamp = buffer.timestamp;
return 0;
}
const uint32_t v4l2_request_capture_pixelformats[] = {
V4L2_PIX_FMT_NV12,
#ifdef DRM_FORMAT_MOD_ALLWINNER_TILED
V4L2_PIX_FMT_SUNXI_TILED_NV12,
#endif
#if defined(V4L2_PIX_FMT_NV15) && defined(DRM_FORMAT_NV15)
V4L2_PIX_FMT_NV15,
#endif
V4L2_PIX_FMT_NV16,
#if defined(V4L2_PIX_FMT_NV20) && defined(DRM_FORMAT_NV20)
V4L2_PIX_FMT_NV20,
#endif
};
static int v4l2_request_set_drm_descriptor(V4L2RequestDescriptor *req, struct v4l2_format *format)
{
AVDRMFrameDescriptor *desc = &req->drm;
AVDRMLayerDescriptor *layer = &desc->layers[0];
uint32_t pixelformat = V4L2_TYPE_IS_MULTIPLANAR(format->type) ? format->fmt.pix_mp.pixelformat : format->fmt.pix.pixelformat;
switch (pixelformat) {
case V4L2_PIX_FMT_NV12:
layer->format = DRM_FORMAT_NV12;
desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
break;
#ifdef DRM_FORMAT_MOD_ALLWINNER_TILED
case V4L2_PIX_FMT_SUNXI_TILED_NV12:
layer->format = DRM_FORMAT_NV12;
desc->objects[0].format_modifier = DRM_FORMAT_MOD_ALLWINNER_TILED;
break;
#endif
#if defined(V4L2_PIX_FMT_NV15) && defined(DRM_FORMAT_NV15)
case V4L2_PIX_FMT_NV15:
layer->format = DRM_FORMAT_NV15;
desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
break;
#endif
case V4L2_PIX_FMT_NV16:
layer->format = DRM_FORMAT_NV16;
desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
break;
#if defined(V4L2_PIX_FMT_NV20) && defined(DRM_FORMAT_NV20)
case V4L2_PIX_FMT_NV20:
layer->format = DRM_FORMAT_NV20;
desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
break;
#endif
default:
return -1;
}
desc->nb_objects = 1;
desc->objects[0].fd = req->capture.fd;
desc->objects[0].size = req->capture.size;
desc->nb_layers = 1;
layer->nb_planes = 2;
layer->planes[0].object_index = 0;
layer->planes[0].offset = 0;
layer->planes[0].pitch = V4L2_TYPE_IS_MULTIPLANAR(format->type) ? format->fmt.pix_mp.plane_fmt[0].bytesperline : format->fmt.pix.bytesperline;
layer->planes[1].object_index = 0;
layer->planes[1].offset = layer->planes[0].pitch * (V4L2_TYPE_IS_MULTIPLANAR(format->type) ? format->fmt.pix_mp.height : format->fmt.pix.height);
layer->planes[1].pitch = layer->planes[0].pitch;
return 0;
}
static int v4l2_request_queue_decode(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count, int first_slice, int last_slice)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
struct timeval tv = { 2, 0 };
fd_set except_fds;
int ret;
av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p used=%u controls=%d index=%d fd=%d request_fd=%d first_slice=%d last_slice=%d\n", __func__, avctx, req->output.used, count, req->capture.index, req->capture.fd, req->request_fd, first_slice, last_slice);
if (first_slice)
ctx->timestamp++;
ret = v4l2_request_set_controls(ctx, req->request_fd, control, count);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: set controls failed for request %d, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
return -1;
}
memset(req->output.addr + req->output.used, 0, AV_INPUT_BUFFER_PADDING_SIZE * 4);
ret = v4l2_request_queue_buffer(ctx, req->request_fd, &req->output, last_slice ? 0 : V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: queue output buffer %d failed for request %d, %s (%d)\n", __func__, req->output.index, req->request_fd, strerror(errno), errno);
return -1;
}
if (first_slice) {
ret = v4l2_request_queue_buffer(ctx, -1, &req->capture, 0);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: queue capture buffer %d failed for request %d, %s (%d)\n", __func__, req->capture.index, req->request_fd, strerror(errno), errno);
return -1;
}
}
// NOTE: do we need to dequeue when request fails/timeout?
// 4. queue request and wait
ret = ioctl(req->request_fd, MEDIA_REQUEST_IOC_QUEUE, NULL);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: queue request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
goto fail;
}
FD_ZERO(&except_fds);
FD_SET(req->request_fd, &except_fds);
ret = select(req->request_fd + 1, NULL, NULL, &except_fds, &tv);
if (ret == 0) {
av_log(avctx, AV_LOG_ERROR, "%s: request %d timeout\n", __func__, req->request_fd);
goto fail;
} else if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: select request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
goto fail;
}
ret = v4l2_request_dequeue_buffer(ctx, &req->output);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: dequeue output buffer %d failed for request %d, %s (%d)\n", __func__, req->output.index, req->request_fd, strerror(errno), errno);
return -1;
}
if (last_slice) {
ret = v4l2_request_dequeue_buffer(ctx, &req->capture);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: dequeue capture buffer %d failed for request %d, %s (%d)\n", __func__, req->capture.index, req->request_fd, strerror(errno), errno);
return -1;
}
}
// TODO: check errors
// buffer.flags & V4L2_BUF_FLAG_ERROR
ret = ioctl(req->request_fd, MEDIA_REQUEST_IOC_REINIT, NULL);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: reinit request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
return -1;
}
if (last_slice)
return v4l2_request_set_drm_descriptor(req, &ctx->format);
return 0;
fail:
ret = v4l2_request_dequeue_buffer(ctx, &req->output);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "%s: dequeue output buffer %d failed for request %d, %s (%d)\n", __func__, req->output.index, req->request_fd, strerror(errno), errno);
ret = v4l2_request_dequeue_buffer(ctx, &req->capture);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "%s: dequeue capture buffer %d failed for request %d, %s (%d)\n", __func__, req->capture.index, req->request_fd, strerror(errno), errno);
ret = ioctl(req->request_fd, MEDIA_REQUEST_IOC_REINIT, NULL);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "%s: reinit request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
return -1;
}
int ff_v4l2_request_decode_slice(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count, int first_slice, int last_slice)
{
V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
// fall back to queue each slice as a full frame
if ((req->output.capabilities & V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF) != V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
return v4l2_request_queue_decode(avctx, frame, control, count, 1, 1);
return v4l2_request_queue_decode(avctx, frame, control, count, first_slice, last_slice);
}
int ff_v4l2_request_decode_frame(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count)
{
return v4l2_request_queue_decode(avctx, frame, control, count, 1, 1);
}
static int v4l2_request_try_framesize(AVCodecContext *avctx, uint32_t pixelformat)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
struct v4l2_frmsizeenum frmsize = {
.index = 0,
.pixel_format = pixelformat,
};
if (ioctl(ctx->video_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize) < 0)
return 0;
/*
* We only validate min/max framesize for V4L2_FRMSIZE_TYPE_STEPWISE here, since the alignment
* which is eventually needed will be done driver-side later in VIDIOC_S_FMT and there is no need
* validate step_width/step_height here
*/
do {
if (frmsize.type == V4L2_FRMSIZE_TYPE_DISCRETE && frmsize.discrete.width == avctx->coded_width &&
frmsize.discrete.height == avctx->coded_height)
return 0;
else if ((frmsize.type == V4L2_FRMSIZE_TYPE_STEPWISE || frmsize.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) &&
avctx->coded_width >= frmsize.stepwise.min_width && avctx->coded_height >= frmsize.stepwise.min_height &&
avctx->coded_width <= frmsize.stepwise.max_width && avctx->coded_height <= frmsize.stepwise.max_height)
return 0;
frmsize.index++;
} while (ioctl(ctx->video_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize) >= 0);
av_log(avctx, AV_LOG_INFO, "%s: pixelformat %u not supported for width %u height %u\n", __func__, pixelformat, avctx->coded_width, avctx->coded_height);
return -1;
}
static int v4l2_request_try_format(AVCodecContext *avctx, enum v4l2_buf_type type, uint32_t pixelformat)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
struct v4l2_fmtdesc fmtdesc = {
.index = 0,
.type = type,
};
if (V4L2_TYPE_IS_OUTPUT(type)) {
struct v4l2_create_buffers buffers = {
.count = 0,
.memory = V4L2_MEMORY_MMAP,
.format.type = type,
};
if (ioctl(ctx->video_fd, VIDIOC_CREATE_BUFS, &buffers) < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: create buffers failed for type %u, %s (%d)\n", __func__, type, strerror(errno), errno);
return -1;
}
if ((buffers.capabilities & V4L2_BUF_CAP_SUPPORTS_REQUESTS) != V4L2_BUF_CAP_SUPPORTS_REQUESTS) {
av_log(avctx, AV_LOG_INFO, "%s: output buffer type do not support requests, capabilities %u\n", __func__, buffers.capabilities);
return -1;
}
}
while (ioctl(ctx->video_fd, VIDIOC_ENUM_FMT, &fmtdesc) >= 0) {
if (fmtdesc.pixelformat == pixelformat)
return 0;
fmtdesc.index++;
}
av_log(avctx, AV_LOG_INFO, "%s: pixelformat %u not supported for type %u\n", __func__, pixelformat, type);
return -1;
}
static int v4l2_request_set_format(AVCodecContext *avctx, enum v4l2_buf_type type, uint32_t pixelformat, uint32_t buffersize)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
struct v4l2_format format = {
.type = type,
};
if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
format.fmt.pix_mp.width = avctx->coded_width;
format.fmt.pix_mp.height = avctx->coded_height;
format.fmt.pix_mp.pixelformat = pixelformat;
format.fmt.pix_mp.plane_fmt[0].sizeimage = buffersize;
format.fmt.pix_mp.num_planes = 1;
} else {
format.fmt.pix.width = avctx->coded_width;
format.fmt.pix.height = avctx->coded_height;
format.fmt.pix.pixelformat = pixelformat;
format.fmt.pix.sizeimage = buffersize;
}
return ioctl(ctx->video_fd, VIDIOC_S_FMT, &format);
}
static int v4l2_request_select_capture_format(AVCodecContext *avctx)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
enum v4l2_buf_type type = ctx->format.type;
#if 0
struct v4l2_format format = {
.type = type,
};
struct v4l2_fmtdesc fmtdesc = {
.index = 0,
.type = type,
};
uint32_t pixelformat;
int i;
if (ioctl(ctx->video_fd, VIDIOC_G_FMT, &format) < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get capture format failed, %s (%d)\n", __func__, strerror(errno), errno);
return -1;
}
pixelformat = V4L2_TYPE_IS_MULTIPLANAR(type) ? format.fmt.pix_mp.pixelformat : format.fmt.pix.pixelformat;
for (i = 0; i < FF_ARRAY_ELEMS(v4l2_request_capture_pixelformats); i++) {
if (pixelformat == v4l2_request_capture_pixelformats[i])
return v4l2_request_set_format(avctx, type, pixelformat, 0);
}
while (ioctl(ctx->video_fd, VIDIOC_ENUM_FMT, &fmtdesc) >= 0) {
for (i = 0; i < FF_ARRAY_ELEMS(v4l2_request_capture_pixelformats); i++) {
if (fmtdesc.pixelformat == v4l2_request_capture_pixelformats[i])
return v4l2_request_set_format(avctx, type, fmtdesc.pixelformat, 0);
}
fmtdesc.index++;
}
#else
for (int i = 0; i < FF_ARRAY_ELEMS(v4l2_request_capture_pixelformats); i++) {
uint32_t pixelformat = v4l2_request_capture_pixelformats[i];
if (!v4l2_request_try_format(avctx, type, pixelformat))
return v4l2_request_set_format(avctx, type, pixelformat, 0);
}
#endif
return -1;
}
static int v4l2_request_probe_video_device(struct udev_device *device, AVCodecContext *avctx, uint32_t pixelformat, uint32_t buffersize, struct v4l2_ext_control *control, int count)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret = AVERROR(EINVAL);
struct v4l2_capability capability = {0};
unsigned int capabilities = 0;
const char *path = udev_device_get_devnode(device);
if (!path) {
av_log(avctx, AV_LOG_ERROR, "%s: get video device devnode failed\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
ctx->video_fd = open(path, O_RDWR | O_NONBLOCK, 0);
if (ctx->video_fd < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: opening %s failed, %s (%d)\n", __func__, path, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
ret = ioctl(ctx->video_fd, VIDIOC_QUERYCAP, &capability);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get video capability failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
if (capability.capabilities & V4L2_CAP_DEVICE_CAPS)
capabilities = capability.device_caps;
else
capabilities = capability.capabilities;
av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p ctx=%p path=%s capabilities=%u\n", __func__, avctx, ctx, path, capabilities);
if ((capabilities & V4L2_CAP_STREAMING) != V4L2_CAP_STREAMING) {
av_log(avctx, AV_LOG_ERROR, "%s: missing required streaming capability\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
if ((capabilities & V4L2_CAP_VIDEO_M2M_MPLANE) == V4L2_CAP_VIDEO_M2M_MPLANE) {
ctx->output_type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
ctx->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
} else if ((capabilities & V4L2_CAP_VIDEO_M2M) == V4L2_CAP_VIDEO_M2M) {
ctx->output_type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
ctx->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
} else {
av_log(avctx, AV_LOG_ERROR, "%s: missing required mem2mem capability\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
ret = v4l2_request_try_format(avctx, ctx->output_type, pixelformat);
if (ret < 0) {
av_log(avctx, AV_LOG_WARNING, "%s: try output format failed\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
ret = v4l2_request_try_framesize(avctx, pixelformat);
if (ret < 0) {
av_log(avctx, AV_LOG_WARNING, "%s: try framesize failed\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
ret = v4l2_request_set_format(avctx, ctx->output_type, pixelformat, buffersize);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: set output format failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
ret = v4l2_request_set_controls(ctx, -1, control, count);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: set controls failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
ret = v4l2_request_select_capture_format(avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_WARNING, "%s: select capture format failed\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
return 0;
fail:
if (ctx->video_fd >= 0) {
close(ctx->video_fd);
ctx->video_fd = -1;
}
return ret;
}
static int v4l2_request_init_context(AVCodecContext *avctx)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret;
ret = ioctl(ctx->video_fd, VIDIOC_G_FMT, &ctx->format);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get capture format failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->format.type)) {
av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u num_planes=%u\n", __func__, ctx->format.fmt.pix_mp.pixelformat, ctx->format.fmt.pix_mp.width, ctx->format.fmt.pix_mp.height, ctx->format.fmt.pix_mp.plane_fmt[0].bytesperline, ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage, ctx->format.fmt.pix_mp.num_planes);
} else {
av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u\n", __func__, ctx->format.fmt.pix.pixelformat, ctx->format.fmt.pix.width, ctx->format.fmt.pix.height, ctx->format.fmt.pix.bytesperline, ctx->format.fmt.pix.sizeimage);
}
ret = ff_decode_get_hw_frames_ctx(avctx, AV_HWDEVICE_TYPE_DRM);
if (ret < 0)
goto fail;
ret = ioctl(ctx->video_fd, VIDIOC_STREAMON, &ctx->output_type);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: output stream on failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
ret = ioctl(ctx->video_fd, VIDIOC_STREAMON, &ctx->format.type);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: capture stream on failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
return 0;
fail:
ff_v4l2_request_uninit(avctx);
return ret;
}
static int v4l2_request_probe_media_device(struct udev_device *device, AVCodecContext *avctx, uint32_t pixelformat, uint32_t buffersize, struct v4l2_ext_control *control, int count)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret;
struct media_device_info device_info = {0};
struct media_v2_topology topology = {0};
struct media_v2_interface *interfaces = NULL;
struct udev *udev = udev_device_get_udev(device);
struct udev_device *video_device;
dev_t devnum;
const char *path = udev_device_get_devnode(device);
if (!path) {
av_log(avctx, AV_LOG_ERROR, "%s: get media device devnode failed\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
ctx->media_fd = open(path, O_RDWR, 0);
if (ctx->media_fd < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: opening %s failed, %s (%d)\n", __func__, path, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
ret = ioctl(ctx->media_fd, MEDIA_IOC_DEVICE_INFO, &device_info);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get media device info failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p ctx=%p path=%s driver=%s\n", __func__, avctx, ctx, path, device_info.driver);
ret = ioctl(ctx->media_fd, MEDIA_IOC_G_TOPOLOGY, &topology);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get media topology failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
if (topology.num_interfaces <= 0) {
av_log(avctx, AV_LOG_ERROR, "%s: media device has no interfaces\n", __func__);
ret = AVERROR(EINVAL);
goto fail;
}
interfaces = av_mallocz(topology.num_interfaces * sizeof(struct media_v2_interface));
if (!interfaces) {
av_log(avctx, AV_LOG_ERROR, "%s: allocating media interface struct failed\n", __func__);
ret = AVERROR(ENOMEM);
goto fail;
}
topology.ptr_interfaces = (__u64)(uintptr_t)interfaces;
ret = ioctl(ctx->media_fd, MEDIA_IOC_G_TOPOLOGY, &topology);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get media topology failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = AVERROR(EINVAL);
goto fail;
}
ret = AVERROR(EINVAL);
for (int i = 0; i < topology.num_interfaces; i++) {
if (interfaces[i].intf_type != MEDIA_INTF_T_V4L_VIDEO)
continue;
devnum = makedev(interfaces[i].devnode.major, interfaces[i].devnode.minor);
video_device = udev_device_new_from_devnum(udev, 'c', devnum);
if (!video_device) {
av_log(avctx, AV_LOG_ERROR, "%s: video_device=%p\n", __func__, video_device);
continue;
}
ret = v4l2_request_probe_video_device(video_device, avctx, pixelformat, buffersize, control, count);
udev_device_unref(video_device);
if (!ret)
break;
}
av_freep(&interfaces);
return ret;
fail:
av_freep(&interfaces);
if (ctx->media_fd >= 0) {
close(ctx->media_fd);
ctx->media_fd = -1;
}
return ret;
}
int ff_v4l2_request_init(AVCodecContext *avctx, uint32_t pixelformat, uint32_t buffersize, struct v4l2_ext_control *control, int count)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret = AVERROR(EINVAL);
struct udev *udev;
struct udev_enumerate *enumerate;
struct udev_list_entry *devices;
struct udev_list_entry *entry;
struct udev_device *device;
av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p hw_device_ctx=%p hw_frames_ctx=%p\n", __func__, avctx, avctx->hw_device_ctx, avctx->hw_frames_ctx);
ctx->media_fd = -1;
ctx->video_fd = -1;
ctx->timestamp = 0;
udev = udev_new();
if (!udev) {
av_log(avctx, AV_LOG_ERROR, "%s: allocating udev context failed\n", __func__);
ret = AVERROR(ENOMEM);
goto fail;
}
enumerate = udev_enumerate_new(udev);
if (!enumerate) {
av_log(avctx, AV_LOG_ERROR, "%s: allocating udev enumerator failed\n", __func__);
ret = AVERROR(ENOMEM);
goto fail;
}
udev_enumerate_add_match_subsystem(enumerate, "media");
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
udev_list_entry_foreach(entry, devices) {
const char *path = udev_list_entry_get_name(entry);
if (!path)
continue;
device = udev_device_new_from_syspath(udev, path);
if (!device)
continue;
ret = v4l2_request_probe_media_device(device, avctx, pixelformat, buffersize, control, count);
udev_device_unref(device);
if (!ret)
break;
}
udev_enumerate_unref(enumerate);
if (!ret)
ret = v4l2_request_init_context(avctx);
fail:
udev_unref(udev);
return ret;
}
int ff_v4l2_request_uninit(AVCodecContext *avctx)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret;
av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p ctx=%p\n", __func__, avctx, ctx);
if (ctx->video_fd >= 0) {
ret = ioctl(ctx->video_fd, VIDIOC_STREAMOFF, &ctx->output_type);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "%s: output stream off failed, %s (%d)\n", __func__, strerror(errno), errno);
ret = ioctl(ctx->video_fd, VIDIOC_STREAMOFF, &ctx->format.type);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "%s: capture stream off failed, %s (%d)\n", __func__, strerror(errno), errno);
}
if (avctx->hw_frames_ctx) {
AVHWFramesContext *hwfc = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
av_buffer_pool_flush(hwfc->pool);
}
if (ctx->video_fd >= 0)
close(ctx->video_fd);
if (ctx->media_fd >= 0)
close(ctx->media_fd);
return 0;
}
static int v4l2_request_buffer_alloc(AVCodecContext *avctx, V4L2RequestBuffer *buf, enum v4l2_buf_type type)
{
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
int ret;
struct v4l2_plane planes[1] = {};
struct v4l2_create_buffers buffers = {
.count = 1,
.memory = V4L2_MEMORY_MMAP,
.format.type = type,
};
av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p buf=%p type=%u\n", __func__, avctx, buf, type);
ret = ioctl(ctx->video_fd, VIDIOC_G_FMT, &buffers.format);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: get format failed for type %u, %s (%d)\n", __func__, type, strerror(errno), errno);
return ret;
}
if (V4L2_TYPE_IS_MULTIPLANAR(buffers.format.type)) {
av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u num_planes=%u\n", __func__, buffers.format.fmt.pix_mp.pixelformat, buffers.format.fmt.pix_mp.width, buffers.format.fmt.pix_mp.height, buffers.format.fmt.pix_mp.plane_fmt[0].bytesperline, buffers.format.fmt.pix_mp.plane_fmt[0].sizeimage, buffers.format.fmt.pix_mp.num_planes);
} else {
av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u\n", __func__, buffers.format.fmt.pix.pixelformat, buffers.format.fmt.pix.width, buffers.format.fmt.pix.height, buffers.format.fmt.pix.bytesperline, buffers.format.fmt.pix.sizeimage);
}
ret = ioctl(ctx->video_fd, VIDIOC_CREATE_BUFS, &buffers);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: create buffers failed for type %u, %s (%d)\n", __func__, type, strerror(errno), errno);
return ret;
}
if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
buf->width = buffers.format.fmt.pix_mp.width;
buf->height = buffers.format.fmt.pix_mp.height;
buf->size = buffers.format.fmt.pix_mp.plane_fmt[0].sizeimage;
buf->buffer.length = 1;
buf->buffer.m.planes = planes;
} else {
buf->width = buffers.format.fmt.pix.width;
buf->height = buffers.format.fmt.pix.height;
buf->size = buffers.format.fmt.pix.sizeimage;
}
buf->index = buffers.index;
buf->capabilities = buffers.capabilities;
buf->used = 0;
buf->buffer.type = type;
buf->buffer.memory = V4L2_MEMORY_MMAP;
buf->buffer.index = buf->index;
ret = ioctl(ctx->video_fd, VIDIOC_QUERYBUF, &buf->buffer);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: query buffer %d failed, %s (%d)\n", __func__, buf->index, strerror(errno), errno);
return ret;
}
if (V4L2_TYPE_IS_OUTPUT(type)) {
void *addr = mmap(NULL, buf->size, PROT_READ | PROT_WRITE, MAP_SHARED, ctx->video_fd, V4L2_TYPE_IS_MULTIPLANAR(type) ? buf->buffer.m.planes[0].m.mem_offset : buf->buffer.m.offset);
if (addr == MAP_FAILED) {
av_log(avctx, AV_LOG_ERROR, "%s: mmap failed, %s (%d)\n", __func__, strerror(errno), errno);
return -1;
}
buf->addr = (uint8_t*)addr;
} else {
struct v4l2_exportbuffer exportbuffer = {
.type = type,
.index = buf->index,
.flags = O_RDONLY,
};
ret = ioctl(ctx->video_fd, VIDIOC_EXPBUF, &exportbuffer);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: export buffer %d failed, %s (%d)\n", __func__, buf->index, strerror(errno), errno);
return ret;
}
buf->fd = exportbuffer.fd;
}
av_log(avctx, AV_LOG_DEBUG, "%s: buf=%p index=%d fd=%d addr=%p width=%u height=%u size=%u\n", __func__, buf, buf->index, buf->fd, buf->addr, buf->width, buf->height, buf->size);
return 0;
}
static void v4l2_request_buffer_free(V4L2RequestBuffer *buf)
{
av_log(NULL, AV_LOG_DEBUG, "%s: buf=%p index=%d fd=%d addr=%p width=%u height=%u size=%u\n", __func__, buf, buf->index, buf->fd, buf->addr, buf->width, buf->height, buf->size);
if (buf->addr)
munmap(buf->addr, buf->size);
if (buf->fd >= 0)
close(buf->fd);
}
static void v4l2_request_frame_free(void *opaque, uint8_t *data)
{
AVCodecContext *avctx = opaque;
V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)data;
av_log(NULL, AV_LOG_DEBUG, "%s: avctx=%p data=%p request_fd=%d\n", __func__, avctx, data, req->request_fd);
if (req->request_fd >= 0)
close(req->request_fd);
v4l2_request_buffer_free(&req->capture);
v4l2_request_buffer_free(&req->output);
av_free(data);
}
static AVBufferRef *v4l2_request_frame_alloc(void *opaque, int size)
{
AVCodecContext *avctx = opaque;
V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
V4L2RequestDescriptor *req;
AVBufferRef *ref;
uint8_t *data;
int ret;
data = av_mallocz(size);
if (!data)
return NULL;
av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p size=%d data=%p\n", __func__, avctx, size, data);
ref = av_buffer_create(data, size, v4l2_request_frame_free, avctx, 0);
if (!ref) {
av_freep(&data);
return NULL;
}
req = (V4L2RequestDescriptor*)data;
req->request_fd = -1;
req->output.fd = -1;
req->capture.fd = -1;
ret = v4l2_request_buffer_alloc(avctx, &req->output, ctx->output_type);
if (ret < 0) {
av_buffer_unref(&ref);
return NULL;
}
ret = v4l2_request_buffer_alloc(avctx, &req->capture, ctx->format.type);
if (ret < 0) {
av_buffer_unref(&ref);
return NULL;
}
ret = ioctl(ctx->media_fd, MEDIA_IOC_REQUEST_ALLOC, &req->request_fd);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "%s: request alloc failed, %s (%d)\n", __func__, strerror(errno), errno);
av_buffer_unref(&ref);