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[4], top[4], topleft[4];
74 for (i = 0; i < 4; 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 * 4 * 4) {
82 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
86 for (i = 0; i < 4; 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;
98 if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
99 buffer[x][3] = ptr[4 * x + 3];
102 for (i = 0; i < 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA); i++) {
105 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
108 top[i] = buffer[x+1][i];
110 left[i] = buffer[x][i];
112 diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
114 if (i == 0 || i == 3)
115 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
117 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
125 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
126 const AVFrame *frame, int predictor,
131 if (mb_x == 0 || mb_y == 0) {
132 for (i = 0; i < 3; i++) {
134 int x, y, h, v, linesize;
137 linesize = frame->linesize[i];
139 for (y = 0; y < v; y++) {
140 for (x = 0; x < h; x++) {
143 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
144 if (y == 0 && mb_y == 0) {
145 if (x == 0 && mb_x == 0)
150 if (x == 0 && mb_x == 0) {
151 pred = ptr[-linesize];
153 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
159 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
161 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
166 for (i = 0; i < 3; i++) {
168 int x, y, h, v, linesize;
171 linesize = frame->linesize[i];
173 for (y = 0; y < v; y++) {
174 for (x = 0; x < h; x++) {
177 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
178 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
181 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
183 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
190 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
191 const AVFrame *frame)
193 const int predictor = avctx->prediction_method + 1;
194 LJpegEncContext *s = avctx->priv_data;
195 const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
196 const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
199 for (mb_y = 0; mb_y < mb_height; mb_y++) {
200 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
201 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
202 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
206 for (mb_x = 0; mb_x < mb_width; mb_x++)
207 ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
213 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
214 const AVFrame *pict, int *got_packet)
216 LJpegEncContext *s = avctx->priv_data;
218 const int width = avctx->width;
219 const int height = avctx->height;
220 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
221 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
222 int max_pkt_size = AV_INPUT_BUFFER_MIN_SIZE;
223 int ret, header_bits;
225 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
226 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
227 max_pkt_size += width * height * 3 * 4;
228 else if(avctx->pix_fmt == AV_PIX_FMT_BGRA)
229 max_pkt_size += width * height * 4 * 4;
231 max_pkt_size += mb_width * mb_height * 3 * 4
232 * s->hsample[0] * s->vsample[0];
235 if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
238 init_put_bits(&pb, pkt->data, pkt->size);
240 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
241 s->matrix, s->matrix);
243 header_bits = put_bits_count(&pb);
245 if( avctx->pix_fmt == AV_PIX_FMT_BGR0
246 || avctx->pix_fmt == AV_PIX_FMT_BGRA
247 || avctx->pix_fmt == AV_PIX_FMT_BGR24)
248 ret = ljpeg_encode_bgr(avctx, &pb, pict);
250 ret = ljpeg_encode_yuv(avctx, &pb, pict);
256 ff_mjpeg_escape_FF(&pb, header_bits >> 3);
257 ff_mjpeg_encode_picture_trailer(&pb, header_bits);
260 pkt->size = put_bits_ptr(&pb) - pb.buf;
261 pkt->flags |= AV_PKT_FLAG_KEY;
267 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
269 LJpegEncContext *s = avctx->priv_data;
271 av_freep(&s->scratch);
276 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
278 LJpegEncContext *s = avctx->priv_data;
280 if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
281 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
282 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
283 avctx->color_range == AVCOL_RANGE_MPEG) &&
284 avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
285 av_log(avctx, AV_LOG_ERROR,
286 "Limited range YUV is non-standard, set strict_std_compliance to "
287 "at least unofficial to use it.\n");
288 return AVERROR(EINVAL);
291 #if FF_API_CODED_FRAME
292 FF_DISABLE_DEPRECATION_WARNINGS
293 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
294 avctx->coded_frame->key_frame = 1;
295 FF_ENABLE_DEPRECATION_WARNINGS
298 s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
302 ff_idctdsp_init(&s->idsp, avctx);
303 ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
306 ff_mjpeg_init_hvsample(avctx, s->hsample, s->vsample);
308 ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
309 s->huff_code_dc_luminance,
310 avpriv_mjpeg_bits_dc_luminance,
311 avpriv_mjpeg_val_dc);
312 ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
313 s->huff_code_dc_chrominance,
314 avpriv_mjpeg_bits_dc_chrominance,
315 avpriv_mjpeg_val_dc);
319 ljpeg_encode_close(avctx);
320 return AVERROR(ENOMEM);
323 AVCodec ff_ljpeg_encoder = {
325 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
326 .type = AVMEDIA_TYPE_VIDEO,
327 .id = AV_CODEC_ID_LJPEG,
328 .priv_data_size = sizeof(LJpegEncContext),
329 .init = ljpeg_encode_init,
330 .encode2 = ljpeg_encode_frame,
331 .close = ljpeg_encode_close,
332 .capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
333 .pix_fmts = (const enum AVPixelFormat[]){
334 AV_PIX_FMT_BGR24 , AV_PIX_FMT_BGRA , AV_PIX_FMT_BGR0,
335 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
336 AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,