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"
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 * 3) {
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 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 for (i = 0; i < 3; i++) {
97 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
100 top[i] = buffer[x+1][i];
102 left[i] = buffer[x][i];
104 diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
107 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
109 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
117 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
118 const AVFrame *frame, int predictor,
123 if (mb_x == 0 || mb_y == 0) {
124 for (i = 0; i < 3; i++) {
126 int x, y, h, v, linesize;
129 linesize = frame->linesize[i];
131 for (y = 0; y < v; y++) {
132 for (x = 0; x < h; x++) {
135 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
136 if (y == 0 && mb_y == 0) {
137 if (x == 0 && mb_x == 0)
142 if (x == 0 && mb_x == 0) {
143 pred = ptr[-linesize];
145 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
151 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
153 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
158 for (i = 0; i < 3; i++) {
160 int x, y, h, v, linesize;
163 linesize = frame->linesize[i];
165 for (y = 0; y < v; y++) {
166 for (x = 0; x < h; x++) {
169 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
170 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
173 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
175 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
182 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
183 const AVFrame *frame)
185 const int predictor = avctx->prediction_method + 1;
186 LJpegEncContext *s = avctx->priv_data;
187 const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
188 const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
191 for (mb_y = 0; mb_y < mb_height; mb_y++) {
192 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
193 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
194 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
198 for (mb_x = 0; mb_x < mb_width; mb_x++)
199 ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
205 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
206 const AVFrame *pict, int *got_packet)
208 LJpegEncContext *s = avctx->priv_data;
210 const int width = avctx->width;
211 const int height = avctx->height;
212 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
213 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
214 int max_pkt_size = FF_MIN_BUFFER_SIZE;
215 int ret, header_bits;
217 if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
218 max_pkt_size += width * height * 3 * 3;
220 max_pkt_size += mb_width * mb_height * 3 * 4
221 * s->hsample[0] * s->vsample[0];
223 if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
224 av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
228 init_put_bits(&pb, pkt->data, pkt->size);
230 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
233 header_bits = put_bits_count(&pb);
235 if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
236 ret = ljpeg_encode_bgr(avctx, &pb, pict);
238 ret = ljpeg_encode_yuv(avctx, &pb, pict);
244 ff_mjpeg_encode_picture_trailer(&pb, header_bits);
247 pkt->size = put_bits_ptr(&pb) - pb.buf;
248 pkt->flags |= AV_PKT_FLAG_KEY;
254 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
256 LJpegEncContext *s = avctx->priv_data;
258 av_freep(&s->scratch);
263 static av_cold int ljpeg_encode_init(AVCodecContext *avctx)
265 LJpegEncContext *s = avctx->priv_data;
266 int chroma_v_shift, chroma_h_shift;
268 if ((avctx->pix_fmt == AV_PIX_FMT_YUV420P ||
269 avctx->pix_fmt == AV_PIX_FMT_YUV422P ||
270 avctx->pix_fmt == AV_PIX_FMT_YUV444P ||
271 avctx->color_range == AVCOL_RANGE_MPEG) &&
272 avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
273 av_log(avctx, AV_LOG_ERROR,
274 "Limited range YUV is non-standard, set strict_std_compliance to "
275 "at least unofficial to use it.\n");
276 return AVERROR(EINVAL);
279 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
280 avctx->coded_frame->key_frame = 1;
282 s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
284 ff_idctdsp_init(&s->idsp, avctx);
285 ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
288 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
291 if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
292 s->vsample[0] = s->hsample[0] =
293 s->vsample[1] = s->hsample[1] =
294 s->vsample[2] = s->hsample[2] = 1;
297 s->vsample[1] = 2 >> chroma_v_shift;
298 s->vsample[2] = 2 >> chroma_v_shift;
300 s->hsample[1] = 2 >> chroma_h_shift;
301 s->hsample[2] = 2 >> chroma_h_shift;
304 ff_mjpeg_build_huffman_codes(s->huff_size_dc_luminance,
305 s->huff_code_dc_luminance,
306 avpriv_mjpeg_bits_dc_luminance,
307 avpriv_mjpeg_val_dc);
308 ff_mjpeg_build_huffman_codes(s->huff_size_dc_chrominance,
309 s->huff_code_dc_chrominance,
310 avpriv_mjpeg_bits_dc_chrominance,
311 avpriv_mjpeg_val_dc);
316 AVCodec ff_ljpeg_encoder = {
318 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
319 .type = AVMEDIA_TYPE_VIDEO,
320 .id = AV_CODEC_ID_LJPEG,
321 .priv_data_size = sizeof(LJpegEncContext),
322 .init = ljpeg_encode_init,
323 .encode2 = ljpeg_encode_frame,
324 .close = ljpeg_encode_close,
325 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUVJ420P,