WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/libavcodec/ljpegenc.c

Rev	Author	Line No.	Line
4349	Serge	1	/*
		2	* lossless JPEG encoder
		3	* Copyright (c) 2000, 2001 Fabrice Bellard
		4	* Copyright (c) 2003 Alex Beregszaszi
		5	* Copyright (c) 2003-2004 Michael Niedermayer
		6	*
		7	* Support for external huffman table, various fixes (AVID workaround),
		8	* aspecting, new decode_frame mechanism and apple mjpeg-b support
		9	* by Alex Beregszaszi
		10	*
		11	* This file is part of FFmpeg.
		12	*
		13	* FFmpeg is free software; you can redistribute it and/or
		14	* modify it under the terms of the GNU Lesser General Public
		15	* License as published by the Free Software Foundation; either
		16	* version 2.1 of the License, or (at your option) any later version.
		17	*
		18	* FFmpeg is distributed in the hope that it will be useful,
		19	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		20	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		21	* Lesser General Public License for more details.
		22	*
		23	* You should have received a copy of the GNU Lesser General Public
		24	* License along with FFmpeg; if not, write to the Free Software
		25	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
		26	*/
		27
		28	/**
		29	* @file
		30	* lossless JPEG encoder.
		31	*/
		32
		33	#include "avcodec.h"
		34	#include "internal.h"
		35	#include "mpegvideo.h"
		36	#include "mjpeg.h"
		37	#include "mjpegenc.h"
		38
		39
		40	static int encode_picture_lossless(AVCodecContext avctx, AVPacket pkt,
		41	const AVFrame pict, int got_packet)
		42	{
		43	MpegEncContext * const s = avctx->priv_data;
		44	MJpegContext * const m = s->mjpeg_ctx;
		45	const int width= s->width;
		46	const int height= s->height;
		47	AVFrame * const p = &s->current_picture.f;
		48	const int predictor= avctx->prediction_method+1;
		49	const int mb_width = (width + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
		50	const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
		51	int ret, max_pkt_size = FF_MIN_BUFFER_SIZE;
		52
		53	if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
		54	max_pkt_size += width * height * 3 * 4;
		55	else {
		56	max_pkt_size += mb_width * mb_height * 3 * 4
		57	* s->mjpeg_hsample[0] * s->mjpeg_vsample[0];
		58	}
		59
		60	if (!s->edge_emu_buffer &&
		61	(ret = ff_mpv_frame_size_alloc(s, pict->linesize[0])) < 0) {
		62	av_log(avctx, AV_LOG_ERROR, "failed to allocate context scratch buffers.\n");
		63	return ret;
		64	}
		65
		66	if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
		67	return ret;
		68
		69	init_put_bits(&s->pb, pkt->data, pkt->size);
		70
		71	av_frame_unref(p);
		72	ret = av_frame_ref(p, pict);
		73	if (ret < 0)
		74	return ret;
		75	p->pict_type= AV_PICTURE_TYPE_I;
		76	p->key_frame= 1;
		77
		78	ff_mjpeg_encode_picture_header(s);
		79
		80	s->header_bits= put_bits_count(&s->pb);
		81
		82	if(avctx->pix_fmt == AV_PIX_FMT_BGR0
		83	\|\| avctx->pix_fmt == AV_PIX_FMT_BGRA
		84	\|\| avctx->pix_fmt == AV_PIX_FMT_BGR24){
		85	int x, y, i;
		86	const int linesize= p->linesize[0];
		87	uint16_t (buffer)[4]= (void ) s->rd_scratchpad;
		88	int left[3], top[3], topleft[3];
		89
		90	for(i=0; i<3; i++){
		91	buffer[0][i]= 1 << (9 - 1);
		92	}
		93
		94	for(y = 0; y < height; y++) {
		95	const int modified_predictor= y ? predictor : 1;
		96	uint8_t ptr = p->data[0] + (linesize y);
		97
		98	if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width34){
		99	av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
		100	return -1;
		101	}
		102
		103	for(i=0; i<3; i++){
		104	top[i]= left[i]= topleft[i]= buffer[0][i];
		105	}
		106	for(x = 0; x < width; x++) {
		107	if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
		108	buffer[x][1] = ptr[3x+0] - ptr[3x+1] + 0x100;
		109	buffer[x][2] = ptr[3x+2] - ptr[3x+1] + 0x100;
		110	buffer[x][0] = (ptr[3x+0] + 2ptr[3x+1] + ptr[3x+2])>>2;
		111	}else{
		112	buffer[x][1] = ptr[4x+0] - ptr[4x+1] + 0x100;
		113	buffer[x][2] = ptr[4x+2] - ptr[4x+1] + 0x100;
		114	buffer[x][0] = (ptr[4x+0] + 2ptr[4x+1] + ptr[4x+2])>>2;
		115	}
		116
		117	for(i=0;i<3;i++) {
		118	int pred, diff;
		119
		120	PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
		121
		122	topleft[i]= top[i];
		123	top[i]= buffer[x+1][i];
		124
		125	left[i]= buffer[x][i];
		126
		127	diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
		128
		129	if(i==0)
		130	ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
		131	else
		132	ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
		133	}
		134	}
		135	}
		136	}else{
		137	int mb_x, mb_y, i;
		138
		139	for(mb_y = 0; mb_y < mb_height; mb_y++) {
		140	if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < mb_width * 4 * 3 * s->mjpeg_hsample[0] * s->mjpeg_vsample[0]){
		141	av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
		142	return -1;
		143	}
		144	for(mb_x = 0; mb_x < mb_width; mb_x++) {
		145	if(mb_x==0 \|\| mb_y==0){
		146	for(i=0;i<3;i++) {
		147	uint8_t *ptr;
		148	int x, y, h, v, linesize;
		149	h = s->mjpeg_hsample[i];
		150	v = s->mjpeg_vsample[i];
		151	linesize= p->linesize[i];
		152
		153	for(y=0; y
		154	for(x=0; x
		155	int pred;
		156
		157	ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
		158	if(y==0 && mb_y==0){
		159	if(x==0 && mb_x==0){
		160	pred= 128;
		161	}else{
		162	pred= ptr[-1];
		163	}
		164	}else{
		165	if(x==0 && mb_x==0){
		166	pred= ptr[-linesize];
		167	}else{
		168	PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
		169	}
		170	}
		171
		172	if(i==0)
		173	ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
		174	else
		175	ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
		176	}
		177	}
		178	}
		179	}else{
		180	for(i=0;i<3;i++) {
		181	uint8_t *ptr;
		182	int x, y, h, v, linesize;
		183	h = s->mjpeg_hsample[i];
		184	v = s->mjpeg_vsample[i];
		185	linesize= p->linesize[i];
		186
		187	for(y=0; y
		188	for(x=0; x
		189	int pred;
		190
		191	ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
		192	PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
		193
		194	if(i==0)
		195	ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
		196	else
		197	ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
		198	}
		199	}
		200	}
		201	}
		202	}
		203	}
		204	}
		205
		206	emms_c();
		207	av_assert0(s->esc_pos == s->header_bits >> 3);
		208	ff_mjpeg_encode_stuffing(s);
		209	ff_mjpeg_encode_picture_trailer(s);
		210	s->picture_number++;
		211
		212	flush_put_bits(&s->pb);
		213	pkt->size = put_bits_ptr(&s->pb) - s->pb.buf;
		214	pkt->flags \|= AV_PKT_FLAG_KEY;
		215	*got_packet = 1;
		216
		217	return 0;
		218	// return (put_bits_count(&f->pb)+7)/8;
		219	}
		220
		221
		222	AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
		223	.name = "ljpeg",
		224	.long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
		225	.type = AVMEDIA_TYPE_VIDEO,
		226	.id = AV_CODEC_ID_LJPEG,
		227	.priv_data_size = sizeof(MpegEncContext),
		228	.init = ff_MPV_encode_init,
		229	.encode2 = encode_picture_lossless,
		230	.close = ff_MPV_encode_end,
		231	.pix_fmts = (const enum AVPixelFormat[]){
		232	AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0,
		233	AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
		234	AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
		235	AV_PIX_FMT_NONE},
		236	};

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(root)/contrib/sdk/sources/ffmpeg/libavcodec/ljpegenc.c – Rev 5373