ffmpeg/libavcodec/libutvideoenc.cpp

241 lines
7.2 KiB
C++

/*
* Copyright (c) 2012 Derek Buitenhuis
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation;
* version 2 of the License.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU 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
* Known FOURCCs:
* 'ULY0' (YCbCr 4:2:0), 'ULY2' (YCbCr 4:2:2), 'ULRG' (RGB), 'ULRA' (RGBA),
* 'ULH0' (YCbCr 4:2:0 BT.709), 'ULH2' (YCbCr 4:2:2 BT.709)
*/
extern "C" {
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "internal.h"
}
#include "libutvideo.h"
#include "put_bits.h"
static av_cold int utvideo_encode_init(AVCodecContext *avctx)
{
UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
UtVideoExtra *info;
uint32_t flags, in_format;
switch (avctx->pix_fmt) {
case AV_PIX_FMT_YUV420P:
in_format = UTVF_YV12;
avctx->bits_per_coded_sample = 12;
avctx->codec_tag = MKTAG('U', 'L', 'Y', '0');
break;
case AV_PIX_FMT_YUYV422:
in_format = UTVF_YUYV;
avctx->bits_per_coded_sample = 16;
avctx->codec_tag = MKTAG('U', 'L', 'Y', '2');
break;
case AV_PIX_FMT_BGR24:
in_format = UTVF_NFCC_BGR_BU;
avctx->bits_per_coded_sample = 24;
avctx->codec_tag = MKTAG('U', 'L', 'R', 'G');
break;
case AV_PIX_FMT_RGB32:
in_format = UTVF_NFCC_BGRA_BU;
avctx->bits_per_coded_sample = 32;
avctx->codec_tag = MKTAG('U', 'L', 'R', 'A');
break;
default:
return AVERROR(EINVAL);
}
/* Check before we alloc anything */
if (avctx->prediction_method != 0 && avctx->prediction_method != 2) {
av_log(avctx, AV_LOG_ERROR, "Invalid prediction method.\n");
return AVERROR(EINVAL);
}
flags = ((avctx->prediction_method + 1) << 8) | (avctx->thread_count - 1);
avctx->priv_data = utv;
avctx->coded_frame = av_frame_alloc();
/* Alloc extradata buffer */
info = (UtVideoExtra *)av_malloc(sizeof(*info));
if (info == NULL) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate extradata buffer.\n");
return AVERROR(ENOMEM);
}
/*
* We use this buffer to hold the data that Ut Video returns,
* since we cannot decode planes separately with it.
*/
utv->buf_size = avpicture_get_size(avctx->pix_fmt,
avctx->width, avctx->height);
utv->buffer = (uint8_t *)av_malloc(utv->buf_size);
if (utv->buffer == NULL) {
av_log(avctx, AV_LOG_ERROR, "Could not allocate output buffer.\n");
return AVERROR(ENOMEM);
}
/*
* Create a Ut Video instance. Since the function wants
* an "interface name" string, pass it the name of the lib.
*/
utv->codec = CCodec::CreateInstance(UNFCC(avctx->codec_tag), "libavcodec");
/* Initialize encoder */
utv->codec->EncodeBegin(in_format, avctx->width, avctx->height,
CBGROSSWIDTH_WINDOWS);
/* Get extradata from encoder */
avctx->extradata_size = utv->codec->EncodeGetExtraDataSize();
utv->codec->EncodeGetExtraData(info, avctx->extradata_size, in_format,
avctx->width, avctx->height,
CBGROSSWIDTH_WINDOWS);
avctx->extradata = (uint8_t *)info;
/* Set flags */
utv->codec->SetState(&flags, sizeof(flags));
return 0;
}
static int utvideo_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pic, int *got_packet)
{
UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
int w = avctx->width, h = avctx->height;
int ret, rgb_size, i;
bool keyframe;
uint8_t *y, *u, *v;
uint8_t *dst;
/* Alloc buffer */
if ((ret = ff_alloc_packet2(avctx, pkt, utv->buf_size)) < 0)
return ret;
dst = pkt->data;
/* Move input if needed data into Ut Video friendly buffer */
switch (avctx->pix_fmt) {
case AV_PIX_FMT_YUV420P:
y = utv->buffer;
u = y + w * h;
v = u + w * h / 4;
for (i = 0; i < h; i++) {
memcpy(y, pic->data[0] + i * pic->linesize[0], w);
y += w;
}
for (i = 0; i < h / 2; i++) {
memcpy(u, pic->data[2] + i * pic->linesize[2], w >> 1);
memcpy(v, pic->data[1] + i * pic->linesize[1], w >> 1);
u += w >> 1;
v += w >> 1;
}
break;
case AV_PIX_FMT_YUYV422:
for (i = 0; i < h; i++)
memcpy(utv->buffer + i * (w << 1),
pic->data[0] + i * pic->linesize[0], w << 1);
break;
case AV_PIX_FMT_BGR24:
case AV_PIX_FMT_RGB32:
/* Ut Video takes bottom-up BGR */
rgb_size = avctx->pix_fmt == AV_PIX_FMT_BGR24 ? 3 : 4;
for (i = 0; i < h; i++)
memcpy(utv->buffer + (h - i - 1) * w * rgb_size,
pic->data[0] + i * pic->linesize[0],
w * rgb_size);
break;
default:
return AVERROR(EINVAL);
}
/* Encode frame */
pkt->size = utv->codec->EncodeFrame(dst, &keyframe, utv->buffer);
if (!pkt->size) {
av_log(avctx, AV_LOG_ERROR, "EncodeFrame failed!\n");
return AVERROR_INVALIDDATA;
}
/*
* Ut Video is intra-only and every frame is a keyframe,
* and the API always returns true. In case something
* durastic changes in the future, such as inter support,
* assert that this is true.
*/
av_assert2(keyframe == true);
avctx->coded_frame->key_frame = 1;
avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
static av_cold int utvideo_encode_close(AVCodecContext *avctx)
{
UtVideoContext *utv = (UtVideoContext *)avctx->priv_data;
av_freep(&avctx->coded_frame);
av_freep(&avctx->extradata);
av_freep(&utv->buffer);
utv->codec->EncodeEnd();
CCodec::DeleteInstance(utv->codec);
return 0;
}
AVCodec ff_libutvideo_encoder = {
"libutvideo",
NULL_IF_CONFIG_SMALL("Ut Video"),
AVMEDIA_TYPE_VIDEO,
AV_CODEC_ID_UTVIDEO,
CODEC_CAP_AUTO_THREADS | CODEC_CAP_LOSSLESS,
NULL, /* supported_framerates */
(const enum AVPixelFormat[]) {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUYV422, AV_PIX_FMT_BGR24,
AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE
},
NULL, /* supported_samplerates */
NULL, /* sample_fmts */
NULL, /* channel_layouts */
0, /* max_lowres */
NULL, /* priv_class */
NULL, /* profiles */
sizeof(UtVideoContext),
NULL, /* next */
NULL, /* init_thread_copy */
NULL, /* update_thread_context */
NULL, /* defaults */
NULL, /* init_static_data */
utvideo_encode_init,
NULL, /* encode */
utvideo_encode_frame,
NULL, /* decode */
utvideo_encode_close,
NULL, /* flush */
};