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"
42 #include "mpegvideo.h"
46 typedef struct LJpegEncContext {
54 uint16_t huff_code_dc_luminance[12];
55 uint16_t huff_code_dc_chrominance[12];
56 uint8_t huff_size_dc_luminance[12];
57 uint8_t huff_size_dc_chrominance[12];
59 uint16_t (*scratch)[4];
62 static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
65 LJpegEncContext *s = avctx->priv_data;
66 const int width = frame->width;
67 const int height = frame->height;
68 const int linesize = frame->linesize[0];
69 uint16_t (*buffer)[4] = s->scratch;
70 const int predictor = avctx->prediction_method+1;
71 int left[3], top[3], topleft[3];
74 for (i = 0; i < 3; i++)
75 buffer[0][i] = 1 << (9 - 1);
77 for (y = 0; y < height; y++) {
78 const int modified_predictor = y ? predictor : 1;
79 uint8_t *ptr = frame->data[0] + (linesize * y);
81 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 4) {
82 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
86 for (i = 0; i < 3; i++)
87 top[i]= left[i]= topleft[i]= buffer[0][i];
89 for (x = 0; x < width; x++) {
90 if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
91 buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
92 buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
93 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
95 buffer[x][1] = ptr[4 * x + 0] - ptr[4 * x + 1] + 0x100;
96 buffer[x][2] = ptr[4 * x + 2] - ptr[4 * x + 1] + 0x100;
97 buffer[x][0] = (ptr[4 * x + 0] + 2 * ptr[4 * x + 1] + ptr[4 * x + 2]) >> 2;
100 for (i = 0; i < 3; i++) {
103 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
106 top[i] = buffer[x+1][i];
108 left[i] = buffer[x][i];
110 diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
113 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
115 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
123 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
124 const AVFrame *frame, int predictor,
129 if (mb_x == 0 || mb_y == 0) {
130 for (i = 0; i < 3; i++) {
132 int x, y, h, v, linesize;
135 linesize = frame->linesize[i];
137 for (y = 0; y < v; y++) {
138 for (x = 0; x < h; x++) {
141 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
142 if (y == 0 && mb_y == 0) {
143 if (x == 0 && mb_x == 0)
148 if (x == 0 && mb_x == 0) {
149 pred = ptr[-linesize];
151 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
157 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
159 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
164 for (i = 0; i < 3; i++) {
166 int x, y, h, v, linesize;
169 linesize = frame->linesize[i];
171 for (y = 0; y < v; y++) {
172 for (x = 0; x < h; x++) {
175 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
176 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
179 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
181 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
188 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
189 const AVFrame *frame)
191 const int predictor = avctx->prediction_method + 1;
192 LJpegEncContext *s = avctx->priv_data;
193 const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
194 const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
197 for (mb_y = 0; mb_y < mb_height; mb_y++) {
198 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
199 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
200 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
204 for (mb_x = 0; mb_x < mb_width; mb_x++)
205 ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
211 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
212 const AVFrame *pict, int *got_packet)
214 LJpegEncContext *s = avctx->priv_data;
216 const int width = avctx->width;
217 const int height = avctx->height;
218 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
219 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
220 int max_pkt_size = FF_MIN_BUFFER_SIZE;
221 int ret, header_bits;
223 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
224 || avctx->pix_fmt == AV_PIX_FMT_BGRA
225 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
226 max_pkt_size += width * height * 3 * 4;
228 max_pkt_size += mb_width * mb_height * 3 * 4
229 * s->hsample[0] * s->vsample[0];
232 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
235 init_put_bits(&pb, pkt->data, pkt->size);
237 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
238 s->matrix, s->matrix);
240 header_bits = put_bits_count(&pb);
242 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
243 || avctx->pix_fmt == AV_PIX_FMT_BGRA
244 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
245 ret = ljpeg_encode_bgr(avctx, &pb, pict);
247 ret = ljpeg_encode_yuv(avctx, &pb, pict);
253 ff_mjpeg_escape_FF(&pb, header_bits >> 3);
254 ff_mjpeg_encode_picture_trailer(&pb, header_bits);
257 pkt->size = put_bits_ptr(&pb) - pb.buf;
258 pkt->flags |= AV_PKT_FLAG_KEY;
264 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
266 LJpegEncContext *s = avctx->priv_data;
268 av_frame_free(&avctx->coded_frame);
269 av_freep(&s->scratch);
274 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
276 LJpegEncContext *s = avctx->priv_data;
278 if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
279 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
280 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
281 avctx->color_range == AVCOL_RANGE_MPEG) &&
282 avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
283 av_log(avctx, AV_LOG_ERROR,
284 "Limited range YUV is non-standard, set strict_std_compliance to "
285 "at least unofficial to use it.\n");
286 return AVERROR(EINVAL);
289 avctx->coded_frame = av_frame_alloc();
290 if (!avctx->coded_frame)
291 return AVERROR(ENOMEM);
293 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
294 avctx->coded_frame->key_frame = 1;
296 s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
300 ff_idctdsp_init(&s->idsp, avctx);
301 ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
304 ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
306 ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
307 s->huff_code_dc_luminance,
308 avpriv_mjpeg_bits_dc_luminance,
309 avpriv_mjpeg_val_dc);
310 ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
311 s->huff_code_dc_chrominance,
312 avpriv_mjpeg_bits_dc_chrominance,
313 avpriv_mjpeg_val_dc);
317 ljpeg_encode_close(avctx);
318 return AVERROR(ENOMEM);
321 AVCodec ff_ljpeg_encoder = {
323 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
324 .type = AVMEDIA_TYPE_VIDEO,
325 .id = AV_CODEC_ID_LJPEG,
326 .priv_data_size = sizeof(LJpegEncContext),
327 .init = ljpeg_encode_init,
328 .encode2 = ljpeg_encode_frame,
329 .close = ljpeg_encode_close,
330 .capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY,
331 .pix_fmts = (const enum AVPixelFormat[]){
332 AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
333 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
334 AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,