libavcodec/ljpegenc.c - manifest_repos/ffmpeg - Git at Google

 /*
  * lossless JPEG encoder
  * Copyright (c) 2000, 2001 Fabrice Bellard
  * Copyright (c) 2003 Alex Beregszaszi
  * Copyright (c) 2003-2004 Michael Niedermayer
  *
  * Support for external huffman table, various fixes (AVID workaround),
  * aspecting, new decode_frame mechanism and apple mjpeg-b support
  *                                  by Alex Beregszaszi
  *
  * 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
  * lossless JPEG encoder.
  */

 #include "libavutil/frame.h"
 #include "libavutil/mem.h"
 #include "libavutil/pixdesc.h"

 #include "avcodec.h"
 #include "idctdsp.h"
 #include "internal.h"
 #include "jpegtables.h"
 #include "mjpegenc_common.h"
 #include "mjpeg.h"

 typedef struct LJpegEncContext {
     AVClass *class;
     IDCTDSPContext idsp;
     ScanTable scantable;
     uint16_t matrix[64];

     int vsample[4];
     int hsample[4];

     uint16_t huff_code_dc_luminance[12];
     uint16_t huff_code_dc_chrominance[12];
     uint8_t  huff_size_dc_luminance[12];
     uint8_t  huff_size_dc_chrominance[12];

     uint16_t (*scratch)[4];
     int pred;
 } LJpegEncContext;

 static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
                             const AVFrame *frame)
 {
     LJpegEncContext *s    = avctx->priv_data;
     const int width       = frame->width;
     const int height      = frame->height;
     const int linesize    = frame->linesize[0];
     uint16_t (*buffer)[4] = s->scratch;
     int left[4], top[4], topleft[4];
     int x, y, i;

 #if FF_API_PRIVATE_OPT
 FF_DISABLE_DEPRECATION_WARNINGS
     if (avctx->prediction_method)
         s->pred = avctx->prediction_method + 1;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

     for (i = 0; i < 4; i++)
         buffer[0][i] = 1 << (9 - 1);

     for (y = 0; y < height; y++) {
         const int modified_predictor = y ? s->pred : 1;
         uint8_t *ptr = frame->data[0] + (linesize * y);

         if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 4 * 4) {
             av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
             return -1;
         }

         for (i = 0; i < 4; i++)
             top[i]= left[i]= topleft[i]= buffer[0][i];

         for (x = 0; x < width; x++) {
             if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
                 buffer[x][1] =  ptr[3 * x + 0] -     ptr[3 * x + 1] + 0x100;
                 buffer[x][2] =  ptr[3 * x + 2] -     ptr[3 * x + 1] + 0x100;
                 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
             }else{
                 buffer[x][1] =  ptr[4 * x + 0] -     ptr[4 * x + 1] + 0x100;
                 buffer[x][2] =  ptr[4 * x + 2] -     ptr[4 * x + 1] + 0x100;
                 buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
                 if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
                     buffer[x][3] =  ptr[4 * x + 3];
             }

             for (i = 0; i < 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); i++) {
                 int pred, diff;

                 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);

                 topleft[i] = top[i];
                 top[i]     = buffer[x+1][i];

                 left[i]    = buffer[x][i];

                 diff       = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;

                 if (i == 0 || i == 3)
                     ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
                 else
                     ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
             }
         }
     }

     return 0;
 }

 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
                                        const AVFrame *frame, int predictor,
                                        int mb_x, int mb_y)
 {
     int i;

     if (mb_x == 0 || mb_y == 0) {
         for (i = 0; i < 3; i++) {
             uint8_t *ptr;
             int x, y, h, v, linesize;
             h = s->hsample[i];
             v = s->vsample[i];
             linesize = frame->linesize[i];

             for (y = 0; y < v; y++) {
                 for (x = 0; x < h; x++) {
                     int pred;

                     ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
                     if (y == 0 && mb_y == 0) {
                         if (x == 0 && mb_x == 0)
                             pred = 128;
                         else
                             pred = ptr[-1];
                     } else {
                         if (x == 0 && mb_x == 0) {
                             pred = ptr[-linesize];
                         } else {
                             PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
                                     ptr[-1], predictor);
                         }
                     }

                     if (i == 0)
                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
                     else
                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
                 }
             }
         }
     } else {
         for (i = 0; i < 3; i++) {
             uint8_t *ptr;
             int x, y, h, v, linesize;
             h = s->hsample[i];
             v = s->vsample[i];
             linesize = frame->linesize[i];

             for (y = 0; y < v; y++) {
                 for (x = 0; x < h; x++) {
                     int pred;

                     ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
                     PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);

                     if (i == 0)
                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
                     else
                         ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
                 }
             }
         }
     }
 }

 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
                             const AVFrame *frame)
 {
     LJpegEncContext *s  = avctx->priv_data;
     const int mb_width  = (avctx->width  + s->hsample[0] - 1) / s->hsample[0];
     const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
     int mb_x, mb_y;

 #if FF_API_PRIVATE_OPT
 FF_DISABLE_DEPRECATION_WARNINGS
     if (avctx->prediction_method)
         s->pred = avctx->prediction_method + 1;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

     for (mb_y = 0; mb_y < mb_height; mb_y++) {
         if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
             mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
             av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
             return -1;
         }

         for (mb_x = 0; mb_x < mb_width; mb_x++)
             ljpeg_encode_yuv_mb(s, pb, frame, s->pred, mb_x, mb_y);
     }

     return 0;
 }

 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                               const AVFrame *pict, int *got_packet)
 {
     LJpegEncContext *s = avctx->priv_data;
     PutBitContext pb;
     const int width  = avctx->width;
     const int height = avctx->height;
     const int mb_width  = (width  + s->hsample[0] - 1) / s->hsample[0];
     const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
     int max_pkt_size = AV_INPUT_BUFFER_MIN_SIZE;
     int ret, header_bits;

     if(    avctx->pix_fmt == AV_PIX_FMT_BGR0
         || avctx->pix_fmt == AV_PIX_FMT_BGR24)
         max_pkt_size += width * height * 3 * 4;
     else if(avctx->pix_fmt == AV_PIX_FMT_BGRA)
         max_pkt_size += width * height * 4 * 4;
     else {
         max_pkt_size += mb_width * mb_height * 3 * 4
                         * s->hsample[0] * s->vsample[0];
     }

     if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
         return ret;

     init_put_bits(&pb, pkt->data, pkt->size);

     ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
                                    s->pred, s->matrix, s->matrix);

     header_bits = put_bits_count(&pb);

     if(    avctx->pix_fmt == AV_PIX_FMT_BGR0
         || avctx->pix_fmt == AV_PIX_FMT_BGRA
         || avctx->pix_fmt == AV_PIX_FMT_BGR24)
         ret = ljpeg_encode_bgr(avctx, &pb, pict);
     else
         ret = ljpeg_encode_yuv(avctx, &pb, pict);
     if (ret < 0)
         return ret;

     emms_c();

     ff_mjpeg_escape_FF(&pb, header_bits >> 3);
     ff_mjpeg_encode_picture_trailer(&pb, header_bits);

     flush_put_bits(&pb);
     pkt->size   = put_bits_ptr(&pb) - pb.buf;
     pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;

     return 0;
 }

 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
 {
     LJpegEncContext *s = avctx->priv_data;

     av_freep(&s->scratch);

     return 0;
 }

 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
 {
     LJpegEncContext *s = avctx->priv_data;

     if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
          avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
          avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
          avctx->color_range == AVCOL_RANGE_MPEG) &&
         avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
         av_log(avctx, AV_LOG_ERROR,
                "Limited range YUV is non-standard, set strict_std_compliance to "
                "at least unofficial to use it.\n");
         return AVERROR(EINVAL);
     }

 #if FF_API_CODED_FRAME
 FF_DISABLE_DEPRECATION_WARNINGS
     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
     avctx->coded_frame->key_frame = 1;
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

     s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
     if (!s->scratch)
         return AVERROR(ENOMEM);

     ff_idctdsp_init(&s->idsp, avctx);
     ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
                       ff_zigzag_direct);

     ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);

     ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
                                  s->huff_code_dc_luminance,
                                  avpriv_mjpeg_bits_dc_luminance,
                                  avpriv_mjpeg_val_dc);
     ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
                                  s->huff_code_dc_chrominance,
                                  avpriv_mjpeg_bits_dc_chrominance,
                                  avpriv_mjpeg_val_dc);

     return 0;
 }

 #define OFFSET(x) offsetof(LJpegEncContext, x)
 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
     { "left",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
     { "plane",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
     { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },

     { NULL},
 };

 static const AVClass ljpeg_class = {
     .class_name = "ljpeg",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 AVCodec ff_ljpeg_encoder = {
     .name           = "ljpeg",
     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_LJPEG,
     .priv_data_size = sizeof(LJpegEncContext),
     .priv_class     = &ljpeg_class,
     .init           = ljpeg_encode_init,
     .encode2        = ljpeg_encode_frame,
     .close          = ljpeg_encode_close,
     .capabilities   = AV_CODEC_CAP_FRAME_THREADS,
     .pix_fmts       = (const enum AVPixelFormat[]){
         AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
         AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_NONE},
 };
	/*
	* lossless JPEG encoder
	* Copyright (c) 2000, 2001 Fabrice Bellard
	* Copyright (c) 2003 Alex Beregszaszi
	* Copyright (c) 2003-2004 Michael Niedermayer
	*
	* Support for external huffman table, various fixes (AVID workaround),
	* aspecting, new decode_frame mechanism and apple mjpeg-b support
	* by Alex Beregszaszi
	*
	* 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
	* lossless JPEG encoder.
	*/

	#include "libavutil/frame.h"
	#include "libavutil/mem.h"
	#include "libavutil/pixdesc.h"

	#include "avcodec.h"
	#include "idctdsp.h"
	#include "internal.h"
	#include "jpegtables.h"
	#include "mjpegenc_common.h"
	#include "mjpeg.h"

	typedef struct LJpegEncContext {
	AVClass *class;
	IDCTDSPContext idsp;
	ScanTable scantable;
	uint16_t matrix[64];

	int vsample[4];
	int hsample[4];

	uint16_t huff_code_dc_luminance[12];
	uint16_t huff_code_dc_chrominance[12];
	uint8_t huff_size_dc_luminance[12];
	uint8_t huff_size_dc_chrominance[12];

	uint16_t (*scratch)[4];
	int pred;
	} LJpegEncContext;

	static int ljpeg_encode_bgr(AVCodecContext avctx, PutBitContext pb,
	const AVFrame *frame)
	{
	LJpegEncContext *s = avctx->priv_data;
	const int width = frame->width;
	const int height = frame->height;
	const int linesize = frame->linesize[0];
	uint16_t (*buffer)[4] = s->scratch;
	int left[4], top[4], topleft[4];
	int x, y, i;

	#if FF_API_PRIVATE_OPT
	FF_DISABLE_DEPRECATION_WARNINGS
	if (avctx->prediction_method)
	s->pred = avctx->prediction_method + 1;
	FF_ENABLE_DEPRECATION_WARNINGS
	#endif

	for (i = 0; i < 4; i++)
	buffer[0][i] = 1 << (9 - 1);

	for (y = 0; y < height; y++) {
	const int modified_predictor = y ? s->pred : 1;
	uint8_t ptr = frame->data[0] + (linesize y);

	if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 4 * 4) {
	av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
	return -1;
	}

	for (i = 0; i < 4; i++)
	top[i]= left[i]= topleft[i]= buffer[0][i];

	for (x = 0; x < width; x++) {
	if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
	buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
	buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
	buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
	}else{
	buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
	buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
	buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
	if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
	buffer[x][3] = ptr[4 * x + 3];
	}

	for (i = 0; i < 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); i++) {
	int pred, diff;

	PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);

	topleft[i] = top[i];
	top[i] = buffer[x+1][i];

	left[i] = buffer[x][i];

	diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;

	if (i == 0 \|\| i == 3)
	ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
	else
	ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
	}
	}
	}

	return 0;
	}

	static inline void ljpeg_encode_yuv_mb(LJpegEncContext s, PutBitContext pb,
	const AVFrame *frame, int predictor,
	int mb_x, int mb_y)
	{
	int i;

	if (mb_x == 0 \|\| mb_y == 0) {
	for (i = 0; i < 3; i++) {
	uint8_t *ptr;
	int x, y, h, v, linesize;
	h = s->hsample[i];
	v = s->vsample[i];
	linesize = frame->linesize[i];

	for (y = 0; y < v; y++) {
	for (x = 0; x < h; x++) {
	int pred;

	ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
	if (y == 0 && mb_y == 0) {
	if (x == 0 && mb_x == 0)
	pred = 128;
	else
	pred = ptr[-1];
	} else {
	if (x == 0 && mb_x == 0) {
	pred = ptr[-linesize];
	} else {
	PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
	ptr[-1], predictor);
	}
	}

	if (i == 0)
	ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
	else
	ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
	}
	}
	}
	} else {
	for (i = 0; i < 3; i++) {
	uint8_t *ptr;
	int x, y, h, v, linesize;
	h = s->hsample[i];
	v = s->vsample[i];
	linesize = frame->linesize[i];

	for (y = 0; y < v; y++) {
	for (x = 0; x < h; x++) {
	int pred;

	ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
	PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);

	if (i == 0)
	ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
	else
	ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
	}
	}
	}
	}
	}

	static int ljpeg_encode_yuv(AVCodecContext avctx, PutBitContext pb,
	const AVFrame *frame)
	{
	LJpegEncContext *s = avctx->priv_data;
	const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
	const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
	int mb_x, mb_y;

	#if FF_API_PRIVATE_OPT
	FF_DISABLE_DEPRECATION_WARNINGS
	if (avctx->prediction_method)
	s->pred = avctx->prediction_method + 1;
	FF_ENABLE_DEPRECATION_WARNINGS
	#endif

	for (mb_y = 0; mb_y < mb_height; mb_y++) {
	if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
	mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
	av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
	return -1;
	}

	for (mb_x = 0; mb_x < mb_width; mb_x++)
	ljpeg_encode_yuv_mb(s, pb, frame, s->pred, mb_x, mb_y);
	}

	return 0;
	}

	static int ljpeg_encode_frame(AVCodecContext avctx, AVPacket pkt,
	const AVFrame pict, int got_packet)
	{
	LJpegEncContext *s = avctx->priv_data;
	PutBitContext pb;
	const int width = avctx->width;
	const int height = avctx->height;
	const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
	const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
	int max_pkt_size = AV_INPUT_BUFFER_MIN_SIZE;
	int ret, header_bits;

	if( avctx->pix_fmt == AV_PIX_FMT_BGR0
	\|\| avctx->pix_fmt == AV_PIX_FMT_BGR24)
	max_pkt_size += width * height * 3 * 4;
	else if(avctx->pix_fmt == AV_PIX_FMT_BGRA)
	max_pkt_size += width * height * 4 * 4;
	else {
	max_pkt_size += mb_width * mb_height * 3 * 4
	* s->hsample[0] * s->vsample[0];
	}

	if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
	return ret;

	init_put_bits(&pb, pkt->data, pkt->size);

	ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
	s->pred, s->matrix, s->matrix);

	header_bits = put_bits_count(&pb);

	if( avctx->pix_fmt == AV_PIX_FMT_BGR0
	\|\| avctx->pix_fmt == AV_PIX_FMT_BGRA
	\|\| avctx->pix_fmt == AV_PIX_FMT_BGR24)
	ret = ljpeg_encode_bgr(avctx, &pb, pict);
	else
	ret = ljpeg_encode_yuv(avctx, &pb, pict);
	if (ret < 0)
	return ret;

	emms_c();

	ff_mjpeg_escape_FF(&pb, header_bits >> 3);
	ff_mjpeg_encode_picture_trailer(&pb, header_bits);

	flush_put_bits(&pb);
	pkt->size = put_bits_ptr(&pb) - pb.buf;
	pkt->flags \|= AV_PKT_FLAG_KEY;
	*got_packet = 1;

	return 0;
	}

	static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
	{
	LJpegEncContext *s = avctx->priv_data;

	av_freep(&s->scratch);

	return 0;
	}

	static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
	{
	LJpegEncContext *s = avctx->priv_data;

	if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P \|\|
	avctx->pix_fmt == AV_PIX_FMT_YUV422P \|\|
	avctx->pix_fmt == AV_PIX_FMT_YUV444P \|\|
	avctx->color_range == AVCOL_RANGE_MPEG) &&
	avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
	av_log(avctx, AV_LOG_ERROR,
	"Limited range YUV is non-standard, set strict_std_compliance to "
	"at least unofficial to use it.\n");
	return AVERROR(EINVAL);
	}

	#if FF_API_CODED_FRAME
	FF_DISABLE_DEPRECATION_WARNINGS
	avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
	avctx->coded_frame->key_frame = 1;
	FF_ENABLE_DEPRECATION_WARNINGS
	#endif

	s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
	if (!s->scratch)
	return AVERROR(ENOMEM);

	ff_idctdsp_init(&s->idsp, avctx);
	ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
	ff_zigzag_direct);

	ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);

	ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
	s->huff_code_dc_luminance,
	avpriv_mjpeg_bits_dc_luminance,
	avpriv_mjpeg_val_dc);
	ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
	s->huff_code_dc_chrominance,
	avpriv_mjpeg_bits_dc_chrominance,
	avpriv_mjpeg_val_dc);

	return 0;
	}

	#define OFFSET(x) offsetof(LJpegEncContext, x)
	#define VE AV_OPT_FLAG_VIDEO_PARAM \| AV_OPT_FLAG_ENCODING_PARAM
	static const AVOption options[] = {
	{ "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
	{ "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
	{ "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
	{ "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },

	{ NULL},
	};

	static const AVClass ljpeg_class = {
	.class_name = "ljpeg",
	.item_name = av_default_item_name,
	.option = options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	AVCodec ff_ljpeg_encoder = {
	.name = "ljpeg",
	.long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
	.type = AVMEDIA_TYPE_VIDEO,
	.id = AV_CODEC_ID_LJPEG,
	.priv_data_size = sizeof(LJpegEncContext),
	.priv_class = &ljpeg_class,
	.init = ljpeg_encode_init,
	.encode2 = ljpeg_encode_frame,
	.close = ljpeg_encode_close,
	.capabilities = AV_CODEC_CAP_FRAME_THREADS,
	.pix_fmts = (const enum AVPixelFormat[]){
	AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
	AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
	AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
	AV_PIX_FMT_NONE},
	};