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 "jpegtables.h"
41 #include "mjpegenc_common.h"
45 typedef struct LJpegEncContext {
53 uint16_t huff_code_dc_luminance[12];
54 uint16_t huff_code_dc_chrominance[12];
55 uint8_t huff_size_dc_luminance[12];
56 uint8_t huff_size_dc_chrominance[12];
58 uint16_t (*scratch)[4];
61 static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
64 LJpegEncContext *s = avctx->priv_data;
65 const int width = frame->width;
66 const int height = frame->height;
67 const int linesize = frame->linesize[0];
68 uint16_t (*buffer)[4] = s->scratch;
69 const int predictor = avctx->prediction_method+1;
70 int left[4], top[4], topleft[4];
73 for (i = 0; i < 4; i++)
74 buffer[0][i] = 1 << (9 - 1);
76 for (y = 0; y < height; y++) {
77 const int modified_predictor = y ? predictor : 1;
78 uint8_t *ptr = frame->data[0] + (linesize * y);
80 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 4 * 4) {
81 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
85 for (i = 0; i < 4; i++)
86 top[i]= left[i]= topleft[i]= buffer[0][i];
88 for (x = 0; x < width; x++) {
89 if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
90 buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
91 buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
92 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
94 buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
95 buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
96 buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
97 if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
98 buffer[x][3] = ptr[4 * x + 3];
101 for (i = 0; i < 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); i++) {
104 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
107 top[i] = buffer[x+1][i];
109 left[i] = buffer[x][i];
111 diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
113 if (i == 0 || i == 3)
114 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
116 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
124 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
125 const AVFrame *frame, int predictor,
130 if (mb_x == 0 || mb_y == 0) {
131 for (i = 0; i < 3; i++) {
133 int x, y, h, v, linesize;
136 linesize = frame->linesize[i];
138 for (y = 0; y < v; y++) {
139 for (x = 0; x < h; x++) {
142 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
143 if (y == 0 && mb_y == 0) {
144 if (x == 0 && mb_x == 0)
149 if (x == 0 && mb_x == 0) {
150 pred = ptr[-linesize];
152 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
158 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
160 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
165 for (i = 0; i < 3; i++) {
167 int x, y, h, v, linesize;
170 linesize = frame->linesize[i];
172 for (y = 0; y < v; y++) {
173 for (x = 0; x < h; x++) {
176 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
177 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
180 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
182 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
189 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
190 const AVFrame *frame)
192 const int predictor = avctx->prediction_method + 1;
193 LJpegEncContext *s = avctx->priv_data;
194 const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
195 const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
198 for (mb_y = 0; mb_y < mb_height; mb_y++) {
199 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
200 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
201 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
205 for (mb_x = 0; mb_x < mb_width; mb_x++)
206 ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
212 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
213 const AVFrame *pict, int *got_packet)
215 LJpegEncContext *s = avctx->priv_data;
217 const int width = avctx->width;
218 const int height = avctx->height;
219 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
220 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
221 int max_pkt_size = AV_INPUT_BUFFER_MIN_SIZE;
222 int ret, header_bits;
224 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
225 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
226 max_pkt_size += width * height * 3 * 4;
227 else if(avctx->pix_fmt == AV_PIX_FMT_BGRA)
228 max_pkt_size += width * height * 4 * 4;
230 max_pkt_size += mb_width * mb_height * 3 * 4
231 * s->hsample[0] * s->vsample[0];
234 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
237 init_put_bits(&pb, pkt->data, pkt->size);
239 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
240 s->matrix, s->matrix);
242 header_bits = put_bits_count(&pb);
244 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
245 || avctx->pix_fmt == AV_PIX_FMT_BGRA
246 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
247 ret = ljpeg_encode_bgr(avctx, &pb, pict);
249 ret = ljpeg_encode_yuv(avctx, &pb, pict);
255 ff_mjpeg_escape_FF(&pb, header_bits >> 3);
256 ff_mjpeg_encode_picture_trailer(&pb, header_bits);
259 pkt->size = put_bits_ptr(&pb) - pb.buf;
260 pkt->flags |= AV_PKT_FLAG_KEY;
266 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
268 LJpegEncContext *s = avctx->priv_data;
270 av_freep(&s->scratch);
275 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
277 LJpegEncContext *s = avctx->priv_data;
279 if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
280 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
281 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
282 avctx->color_range == AVCOL_RANGE_MPEG) &&
283 avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
284 av_log(avctx, AV_LOG_ERROR,
285 "Limited range YUV is non-standard, set strict_std_compliance to "
286 "at least unofficial to use it.\n");
287 return AVERROR(EINVAL);
290 #if FF_API_CODED_FRAME
291 FF_DISABLE_DEPRECATION_WARNINGS
292 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
293 avctx->coded_frame->key_frame = 1;
294 FF_ENABLE_DEPRECATION_WARNINGS
297 s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
301 ff_idctdsp_init(&s->idsp, avctx);
302 ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
305 ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
307 ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
308 s->huff_code_dc_luminance,
309 avpriv_mjpeg_bits_dc_luminance,
310 avpriv_mjpeg_val_dc);
311 ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
312 s->huff_code_dc_chrominance,
313 avpriv_mjpeg_bits_dc_chrominance,
314 avpriv_mjpeg_val_dc);
318 ljpeg_encode_close(avctx);
319 return AVERROR(ENOMEM);
322 AVCodec ff_ljpeg_encoder = {
324 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
325 .type = AVMEDIA_TYPE_VIDEO,
326 .id = AV_CODEC_ID_LJPEG,
327 .priv_data_size = sizeof(LJpegEncContext),
328 .init = ljpeg_encode_init,
329 .encode2 = ljpeg_encode_frame,
330 .close = ljpeg_encode_close,
331 .capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
332 .pix_fmts = (const enum AVPixelFormat[]){
333 AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
334 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
335 AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,