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ffmpeg/libavcodec/v4l2_m2m_enc.c

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/*
* V4L2 mem2mem encoders
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* 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 <linux/videodev2.h>
#include <sys/ioctl.h>
#include <search.h>
#include "libavcodec/avcodec.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/opt.h"
#include "v4l2_context.h"
#include "v4l2_m2m.h"
#define MPEG_CID(x) V4L2_CID_MPEG_VIDEO_##x
#define MPEG_VIDEO(x) V4L2_MPEG_VIDEO_##x
static inline void v4l2_set_timeperframe(V4L2m2mContext *s, unsigned int num, unsigned int den)
{
struct v4l2_streamparm parm = { 0 };
parm.type = V4L2_TYPE_IS_MULTIPLANAR(s->output.type) ? V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE : V4L2_BUF_TYPE_VIDEO_OUTPUT;
parm.parm.output.timeperframe.denominator = den;
parm.parm.output.timeperframe.numerator = num;
if (ioctl(s->fd, VIDIOC_S_PARM, &parm) < 0)
av_log(s->avctx, AV_LOG_WARNING, "Failed to set timeperframe");
}
static inline void v4l2_set_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int value, const char *name)
{
struct v4l2_ext_controls ctrls = { { 0 } };
struct v4l2_ext_control ctrl = { 0 };
/* set ctrls */
ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
ctrls.controls = &ctrl;
ctrls.count = 1;
/* set ctrl*/
ctrl.value = value;
ctrl.id = id;
if (ioctl(s->fd, VIDIOC_S_EXT_CTRLS, &ctrls) < 0)
av_log(s->avctx, AV_LOG_WARNING, "Failed to set %s: %s\n", name, strerror(errno));
else
av_log(s->avctx, AV_LOG_DEBUG, "Encoder: %s = %d\n", name, value);
}
static inline int v4l2_get_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int *value, const char *name)
{
struct v4l2_ext_controls ctrls = { { 0 } };
struct v4l2_ext_control ctrl = { 0 };
int ret;
/* set ctrls */
ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
ctrls.controls = &ctrl;
ctrls.count = 1;
/* set ctrl*/
ctrl.id = id ;
ret = ioctl(s->fd, VIDIOC_G_EXT_CTRLS, &ctrls);
if (ret < 0) {
av_log(s->avctx, AV_LOG_WARNING, "Failed to set %s\n", name);
return ret;
}
*value = ctrl.value;
return 0;
}
static inline unsigned int v4l2_h264_profile_from_ff(int p)
{
static const struct h264_profile {
unsigned int ffmpeg_val;
unsigned int v4l2_val;
} profile[] = {
{ FF_PROFILE_H264_CONSTRAINED_BASELINE, MPEG_VIDEO(H264_PROFILE_CONSTRAINED_BASELINE) },
{ FF_PROFILE_H264_HIGH_444_PREDICTIVE, MPEG_VIDEO(H264_PROFILE_HIGH_444_PREDICTIVE) },
{ FF_PROFILE_H264_HIGH_422_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_422_INTRA) },
{ FF_PROFILE_H264_HIGH_444_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_444_INTRA) },
{ FF_PROFILE_H264_HIGH_10_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_10_INTRA) },
{ FF_PROFILE_H264_HIGH_422, MPEG_VIDEO(H264_PROFILE_HIGH_422) },
{ FF_PROFILE_H264_BASELINE, MPEG_VIDEO(H264_PROFILE_BASELINE) },
{ FF_PROFILE_H264_EXTENDED, MPEG_VIDEO(H264_PROFILE_EXTENDED) },
{ FF_PROFILE_H264_HIGH_10, MPEG_VIDEO(H264_PROFILE_HIGH_10) },
{ FF_PROFILE_H264_MAIN, MPEG_VIDEO(H264_PROFILE_MAIN) },
{ FF_PROFILE_H264_HIGH, MPEG_VIDEO(H264_PROFILE_HIGH) },
};
int i;
for (i = 0; i < FF_ARRAY_ELEMS(profile); i++) {
if (profile[i].ffmpeg_val == p)
return profile[i].v4l2_val;
}
return AVERROR(ENOENT);
}
static inline int v4l2_mpeg4_profile_from_ff(int p)
{
static const struct mpeg4_profile {
unsigned int ffmpeg_val;
unsigned int v4l2_val;
} profile[] = {
{ FF_PROFILE_MPEG4_ADVANCED_CODING, MPEG_VIDEO(MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY) },
{ FF_PROFILE_MPEG4_ADVANCED_SIMPLE, MPEG_VIDEO(MPEG4_PROFILE_ADVANCED_SIMPLE) },
{ FF_PROFILE_MPEG4_SIMPLE_SCALABLE, MPEG_VIDEO(MPEG4_PROFILE_SIMPLE_SCALABLE) },
{ FF_PROFILE_MPEG4_SIMPLE, MPEG_VIDEO(MPEG4_PROFILE_SIMPLE) },
{ FF_PROFILE_MPEG4_CORE, MPEG_VIDEO(MPEG4_PROFILE_CORE) },
};
int i;
for (i = 0; i < FF_ARRAY_ELEMS(profile); i++) {
if (profile[i].ffmpeg_val == p)
return profile[i].v4l2_val;
}
return AVERROR(ENOENT);
}
static int v4l2_check_b_frame_support(V4L2m2mContext *s)
{
if (s->avctx->max_b_frames)
av_log(s->avctx, AV_LOG_WARNING, "Encoder does not support b-frames yet\n");
v4l2_set_ext_ctrl(s, MPEG_CID(B_FRAMES), 0, "number of B-frames");
v4l2_get_ext_ctrl(s, MPEG_CID(B_FRAMES), &s->avctx->max_b_frames, "number of B-frames");
if (s->avctx->max_b_frames == 0)
return 0;
avpriv_report_missing_feature(s->avctx, "DTS/PTS calculation for V4L2 encoding");
return AVERROR_PATCHWELCOME;
}
static int v4l2_prepare_encoder(V4L2m2mContext *s)
{
AVCodecContext *avctx = s->avctx;
int qmin_cid, qmax_cid, qmin, qmax;
int ret, val;
/**
* requirements
*/
ret = v4l2_check_b_frame_support(s);
if (ret)
return ret;
/**
* settingss
*/
if (avctx->framerate.num || avctx->framerate.den)
v4l2_set_timeperframe(s, avctx->framerate.num, avctx->framerate.den);
/* set ext ctrls */
v4l2_set_ext_ctrl(s, MPEG_CID(HEADER_MODE), MPEG_VIDEO(HEADER_MODE_SEPARATE), "header mode");
v4l2_set_ext_ctrl(s, MPEG_CID(BITRATE) , avctx->bit_rate, "bit rate");
v4l2_set_ext_ctrl(s, MPEG_CID(GOP_SIZE), avctx->gop_size,"gop size");
av_log(avctx, AV_LOG_DEBUG,
"Encoder Context: id (%d), profile (%d), frame rate(%d/%d), number b-frames (%d), "
"gop size (%d), bit rate (%"PRId64"), qmin (%d), qmax (%d)\n",
avctx->codec_id, avctx->profile, avctx->framerate.num, avctx->framerate.den,
avctx->max_b_frames, avctx->gop_size, avctx->bit_rate, avctx->qmin, avctx->qmax);
switch (avctx->codec_id) {
case AV_CODEC_ID_H264:
val = v4l2_h264_profile_from_ff(avctx->profile);
if (val < 0)
av_log(avctx, AV_LOG_WARNING, "h264 profile not found\n");
else
v4l2_set_ext_ctrl(s, MPEG_CID(H264_PROFILE), val, "h264 profile");
qmin_cid = MPEG_CID(H264_MIN_QP);
qmax_cid = MPEG_CID(H264_MAX_QP);
qmin = 0;
qmax = 51;
break;
case AV_CODEC_ID_MPEG4:
val = v4l2_mpeg4_profile_from_ff(avctx->profile);
if (val < 0)
av_log(avctx, AV_LOG_WARNING, "mpeg4 profile not found\n");
else
v4l2_set_ext_ctrl(s, MPEG_CID(MPEG4_PROFILE), val, "mpeg4 profile");
qmin_cid = MPEG_CID(MPEG4_MIN_QP);
qmax_cid = MPEG_CID(MPEG4_MAX_QP);
if (avctx->flags & AV_CODEC_FLAG_QPEL)
v4l2_set_ext_ctrl(s, MPEG_CID(MPEG4_QPEL), 1, "qpel");
qmin = 1;
qmax = 31;
break;
case AV_CODEC_ID_H263:
qmin_cid = MPEG_CID(H263_MIN_QP);
qmax_cid = MPEG_CID(H263_MAX_QP);
qmin = 1;
qmax = 31;
break;
case AV_CODEC_ID_VP8:
qmin_cid = MPEG_CID(VPX_MIN_QP);
qmax_cid = MPEG_CID(VPX_MAX_QP);
qmin = 0;
qmax = 127;
break;
case AV_CODEC_ID_VP9:
qmin_cid = MPEG_CID(VPX_MIN_QP);
qmax_cid = MPEG_CID(VPX_MAX_QP);
qmin = 0;
qmax = 255;
break;
default:
return 0;
}
if (qmin != avctx->qmin || qmax != avctx->qmax)
av_log(avctx, AV_LOG_WARNING, "Encoder adjusted: qmin (%d), qmax (%d)\n", qmin, qmax);
v4l2_set_ext_ctrl(s, qmin_cid, qmin, "minimum video quantizer scale");
v4l2_set_ext_ctrl(s, qmax_cid, qmax, "maximum video quantizer scale");
return 0;
}
static int v4l2_send_frame(AVCodecContext *avctx, const AVFrame *frame)
{
V4L2m2mContext *s = ((V4L2m2mPriv*)avctx->priv_data)->context;
V4L2Context *const output = &s->output;
#ifdef V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME
if (frame && frame->pict_type == AV_PICTURE_TYPE_I)
v4l2_set_ext_ctrl(s, MPEG_CID(FORCE_KEY_FRAME), 0, "force key frame");
#endif
return ff_v4l2_context_enqueue_frame(output, frame);
}
static int v4l2_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
{
V4L2m2mContext *s = ((V4L2m2mPriv*)avctx->priv_data)->context;
V4L2Context *const capture = &s->capture;
V4L2Context *const output = &s->output;
int ret;
if (s->draining)
goto dequeue;
if (!output->streamon) {
ret = ff_v4l2_context_set_status(output, VIDIOC_STREAMON);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMON failed on output context\n");
return ret;
}
}
if (!capture->streamon) {
ret = ff_v4l2_context_set_status(capture, VIDIOC_STREAMON);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMON failed on capture context\n");
return ret;
}
}
dequeue:
return ff_v4l2_context_dequeue_packet(capture, avpkt);
}
static av_cold int v4l2_encode_init(AVCodecContext *avctx)
{
V4L2Context *capture, *output;
V4L2m2mContext *s;
V4L2m2mPriv *priv = avctx->priv_data;
int ret;
ret = ff_v4l2_m2m_create_context(priv, &s);
if (ret < 0)
return ret;
capture = &s->capture;
output = &s->output;
/* common settings output/capture */
output->height = capture->height = avctx->height;
output->width = capture->width = avctx->width;
/* output context */
output->av_codec_id = AV_CODEC_ID_RAWVIDEO;
output->av_pix_fmt = avctx->pix_fmt;
/* capture context */
capture->av_codec_id = avctx->codec_id;
capture->av_pix_fmt = AV_PIX_FMT_NONE;
ret = ff_v4l2_m2m_codec_init(priv);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "can't configure encoder\n");
return ret;
}
s->avctx = avctx;
return v4l2_prepare_encoder(s);
}
static av_cold int v4l2_encode_close(AVCodecContext *avctx)
{
return ff_v4l2_m2m_codec_end(avctx->priv_data);
}
#define OFFSET(x) offsetof(V4L2m2mPriv, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
V4L_M2M_DEFAULT_OPTS,
{ "num_capture_buffers", "Number of buffers in the capture context",
OFFSET(num_capture_buffers), AV_OPT_TYPE_INT, {.i64 = 4 }, 4, INT_MAX, FLAGS },
{ NULL },
};
#define M2MENC_CLASS(NAME) \
static const AVClass v4l2_m2m_ ## NAME ## _enc_class = { \
.class_name = #NAME "_v4l2m2m_encoder", \
.item_name = av_default_item_name, \
.option = options, \
.version = LIBAVUTIL_VERSION_INT, \
};
#define M2MENC(NAME, LONGNAME, CODEC) \
M2MENC_CLASS(NAME) \
AVCodec ff_ ## NAME ## _v4l2m2m_encoder = { \
.name = #NAME "_v4l2m2m" , \
.long_name = NULL_IF_CONFIG_SMALL("V4L2 mem2mem " LONGNAME " encoder wrapper"), \
.type = AVMEDIA_TYPE_VIDEO, \
.id = CODEC , \
.priv_data_size = sizeof(V4L2m2mPriv), \
.priv_class = &v4l2_m2m_ ## NAME ##_enc_class, \
.init = v4l2_encode_init, \
.send_frame = v4l2_send_frame, \
.receive_packet = v4l2_receive_packet, \
.close = v4l2_encode_close, \
.capabilities = AV_CODEC_CAP_HARDWARE | AV_CODEC_CAP_DELAY, \
.wrapper_name = "v4l2m2m", \
};
M2MENC(mpeg4,"MPEG4", AV_CODEC_ID_MPEG4);
M2MENC(h263, "H.263", AV_CODEC_ID_H263);
M2MENC(h264, "H.264", AV_CODEC_ID_H264);
M2MENC(hevc, "HEVC", AV_CODEC_ID_HEVC);
M2MENC(vp8, "VP8", AV_CODEC_ID_VP8);
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