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 Libav.
13 * Libav 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 * Libav 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 Libav; 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 {
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];
63 static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
66 LJpegEncContext *s = avctx->priv_data;
67 const int width = frame->width;
68 const int height = frame->height;
69 const int linesize = frame->linesize[0];
70 uint16_t (*buffer)[4] = s->scratch;
71 int left[3], top[3], topleft[3];
74 #if FF_API_PRIVATE_OPT
75 FF_DISABLE_DEPRECATION_WARNINGS
76 if (avctx->prediction_method)
77 s->pred = avctx->prediction_method + 1;
78 FF_ENABLE_DEPRECATION_WARNINGS
81 for (i = 0; i < 3; i++)
82 buffer[0][i] = 1 << (9 - 1);
84 for (y = 0; y < height; y++) {
85 const int modified_predictor = y ? s->pred : 1;
86 uint8_t *ptr = frame->data[0] + (linesize * y);
88 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 3) {
89 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
93 for (i = 0; i < 3; i++)
94 top[i]= left[i]= topleft[i]= buffer[0][i];
96 for (x = 0; x < width; x++) {
97 buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
98 buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
99 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
101 for (i = 0; i < 3; 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;
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 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 #if FF_API_PRIVATE_OPT
198 FF_DISABLE_DEPRECATION_WARNINGS
199 if (avctx->prediction_method)
200 s->pred = avctx->prediction_method + 1;
201 FF_ENABLE_DEPRECATION_WARNINGS
204 for (mb_y = 0; mb_y < mb_height; mb_y++) {
205 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
206 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
207 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
211 for (mb_x = 0; mb_x < mb_width; mb_x++)
212 ljpeg_encode_yuv_mb(s, pb, frame, s->pred, mb_x, mb_y);
218 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
219 const AVFrame *pict, int *got_packet)
221 LJpegEncContext *s = avctx->priv_data;
223 const int width = avctx->width;
224 const int height = avctx->height;
225 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
226 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
227 int max_pkt_size = AV_INPUT_BUFFER_MIN_SIZE;
228 int ret, header_bits;
230 if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
231 max_pkt_size += width * height * 3 * 3;
233 max_pkt_size += mb_width * mb_height * 3 * 4
234 * s->hsample[0] * s->vsample[0];
236 if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
237 av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
241 init_put_bits(&pb, pkt->data, pkt->size);
243 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
246 header_bits = put_bits_count(&pb);
248 if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
249 ret = ljpeg_encode_bgr(avctx, &pb, pict);
251 ret = ljpeg_encode_yuv(avctx, &pb, pict);
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;
279 int chroma_v_shift, chroma_h_shift;
281 if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
282 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
283 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
284 avctx->color_range == AVCOL_RANGE_MPEG) &&
285 avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
286 av_log(avctx, AV_LOG_ERROR,
287 "Limited range YUV is non-standard, set strict_std_compliance to "
288 "at least unofficial to use it.\n");
289 return AVERROR(EINVAL);
292 #if FF_API_CODED_FRAME
293 FF_DISABLE_DEPRECATION_WARNINGS
294 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
295 avctx->coded_frame->key_frame = 1;
296 FF_ENABLE_DEPRECATION_WARNINGS
299 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 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
308 if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
309 s->vsample[0] = s->hsample[0] =
310 s->vsample[1] = s->hsample[1] =
311 s->vsample[2] = s->hsample[2] = 1;
314 s->vsample[1] = 2 >> chroma_v_shift;
315 s->vsample[2] = 2 >> chroma_v_shift;
317 s->hsample[1] = 2 >> chroma_h_shift;
318 s->hsample[2] = 2 >> chroma_h_shift;
321 ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
322 s->huff_code_dc_luminance,
323 avpriv_mjpeg_bits_dc_luminance,
324 avpriv_mjpeg_val_dc);
325 ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
326 s->huff_code_dc_chrominance,
327 avpriv_mjpeg_bits_dc_chrominance,
328 avpriv_mjpeg_val_dc);
333 #define OFFSET(x) offsetof(LJpegEncContext, x)
334 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
335 static const AVOption options[] = {
336 { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
337 { "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
338 { "plane", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
339 { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
344 static const AVClass ljpeg_class = {
345 .class_name = "ljpeg",
346 .item_name = av_default_item_name,
348 .version = LIBAVUTIL_VERSION_INT,
351 AVCodec ff_ljpeg_encoder = {
353 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
354 .type = AVMEDIA_TYPE_VIDEO,
355 .id = AV_CODEC_ID_LJPEG,
356 .priv_data_size = sizeof(LJpegEncContext),
357 .priv_class = &ljpeg_class,
358 .init = ljpeg_encode_init,
359 .encode2 = ljpeg_encode_frame,
360 .close = ljpeg_encode_close,
361 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUVJ420P,