2 * lossless JPEG encoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
7 * Support for external huffman table, various fixes (AVID workaround),
8 * aspecting, new decode_frame mechanism and apple mjpeg-b support
11 * This file is part of FFmpeg.
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.
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.
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
30 * lossless JPEG encoder.
33 #include "libavutil/frame.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/pixdesc.h"
40 #include "mpegvideo.h"
44 typedef struct LJpegEncContext {
52 uint16_t huff_code_dc_luminance[12];
53 uint16_t huff_code_dc_chrominance[12];
54 uint8_t huff_size_dc_luminance[12];
55 uint8_t huff_size_dc_chrominance[12];
57 uint16_t (*scratch)[4];
60 static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
63 LJpegEncContext *s = avctx->priv_data;
64 const int width = frame->width;
65 const int height = frame->height;
66 const int linesize = frame->linesize[0];
67 uint16_t (*buffer)[4] = s->scratch;
68 const int predictor = avctx->prediction_method+1;
69 int left[3], top[3], topleft[3];
72 for (i = 0; i < 3; i++)
73 buffer[0][i] = 1 << (9 - 1);
75 for (y = 0; y < height; y++) {
76 const int modified_predictor = y ? predictor : 1;
77 uint8_t *ptr = frame->data[0] + (linesize * y);
79 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 4) {
80 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
84 for (i = 0; i < 3; i++)
85 top[i]= left[i]= topleft[i]= buffer[0][i];
87 for (x = 0; x < width; x++) {
88 if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
89 buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
90 buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
91 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
93 buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
94 buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
95 buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
98 for (i = 0; i < 3; i++) {
101 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
104 top[i] = buffer[x+1][i];
106 left[i] = buffer[x][i];
108 diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
111 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
113 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
121 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
122 const AVFrame *frame, int predictor,
127 if (mb_x == 0 || mb_y == 0) {
128 for (i = 0; i < 3; i++) {
130 int x, y, h, v, linesize;
133 linesize = frame->linesize[i];
135 for (y = 0; y < v; y++) {
136 for (x = 0; x < h; x++) {
139 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
140 if (y == 0 && mb_y == 0) {
141 if (x == 0 && mb_x == 0)
146 if (x == 0 && mb_x == 0) {
147 pred = ptr[-linesize];
149 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
155 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
157 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
162 for (i = 0; i < 3; i++) {
164 int x, y, h, v, linesize;
167 linesize = frame->linesize[i];
169 for (y = 0; y < v; y++) {
170 for (x = 0; x < h; x++) {
173 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
174 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
177 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
179 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
186 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
187 const AVFrame *frame)
189 const int predictor = avctx->prediction_method + 1;
190 LJpegEncContext *s = avctx->priv_data;
191 const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
192 const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
195 for (mb_y = 0; mb_y < mb_height; mb_y++) {
196 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
197 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
198 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
202 for (mb_x = 0; mb_x < mb_width; mb_x++)
203 ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
209 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
210 const AVFrame *pict, int *got_packet)
212 LJpegEncContext *s = avctx->priv_data;
214 const int width = avctx->width;
215 const int height = avctx->height;
216 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
217 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
218 int max_pkt_size = FF_MIN_BUFFER_SIZE;
219 int ret, header_bits;
221 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
222 || avctx->pix_fmt == AV_PIX_FMT_BGRA
223 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
224 max_pkt_size += width * height * 3 * 4;
226 max_pkt_size += mb_width * mb_height * 3 * 4
227 * s->hsample[0] * s->vsample[0];
230 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
233 init_put_bits(&pb, pkt->data, pkt->size);
235 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
236 s->matrix, s->matrix);
238 header_bits = put_bits_count(&pb);
240 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
241 || avctx->pix_fmt == AV_PIX_FMT_BGRA
242 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
243 ret = ljpeg_encode_bgr(avctx, &pb, pict);
245 ret = ljpeg_encode_yuv(avctx, &pb, pict);
251 ff_mjpeg_escape_FF(&pb, header_bits >> 3);
252 ff_mjpeg_encode_picture_trailer(&pb, header_bits);
255 pkt->size = put_bits_ptr(&pb) - pb.buf;
256 pkt->flags |= AV_PKT_FLAG_KEY;
262 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
264 LJpegEncContext *s = avctx->priv_data;
266 av_frame_free(&avctx->coded_frame);
267 av_freep(&s->scratch);
272 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
274 LJpegEncContext *s = avctx->priv_data;
276 if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
277 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
278 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
279 avctx->color_range == AVCOL_RANGE_MPEG) &&
280 avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
281 av_log(avctx, AV_LOG_ERROR,
282 "Limited range YUV is non-standard, set strict_std_compliance to "
283 "at least unofficial to use it.\n");
284 return AVERROR(EINVAL);
287 avctx->coded_frame = av_frame_alloc();
288 if (!avctx->coded_frame)
289 return AVERROR(ENOMEM);
291 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
292 avctx->coded_frame->key_frame = 1;
294 s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
296 ff_dsputil_init(&s->dsp, avctx);
297 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
299 ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
301 ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
302 s->huff_code_dc_luminance,
303 avpriv_mjpeg_bits_dc_luminance,
304 avpriv_mjpeg_val_dc);
305 ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
306 s->huff_code_dc_chrominance,
307 avpriv_mjpeg_bits_dc_chrominance,
308 avpriv_mjpeg_val_dc);
313 AVCodec ff_ljpeg_encoder = {
315 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
316 .type = AVMEDIA_TYPE_VIDEO,
317 .id = AV_CODEC_ID_LJPEG,
318 .priv_data_size = sizeof(LJpegEncContext),
319 .init = ljpeg_encode_init,
320 .encode2 = ljpeg_encode_frame,
321 .close = ljpeg_encode_close,
322 .pix_fmts = (const enum AVPixelFormat[]){
323 AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
324 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
325 AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,