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 "mjpegenc_common.h"
41 #include "mpegvideo.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[3], top[3], topleft[3];
73 for (i = 0; i < 3; 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 * 3 * 3) {
81 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
85 for (i = 0; i < 3; i++)
86 top[i]= left[i]= topleft[i]= buffer[0][i];
88 for (x = 0; x < width; x++) {
89 buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
90 buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
91 buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
93 for (i = 0; i < 3; i++) {
96 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
99 top[i] = buffer[x+1][i];
101 left[i] = buffer[x][i];
103 diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
106 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
108 ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
116 static inline void ljpeg_encode_yuv_mb(LJpegEncContext *s, PutBitContext *pb,
117 const AVFrame *frame, int predictor,
122 if (mb_x == 0 || mb_y == 0) {
123 for (i = 0; i < 3; i++) {
125 int x, y, h, v, linesize;
128 linesize = frame->linesize[i];
130 for (y = 0; y < v; y++) {
131 for (x = 0; x < h; x++) {
134 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
135 if (y == 0 && mb_y == 0) {
136 if (x == 0 && mb_x == 0)
141 if (x == 0 && mb_x == 0) {
142 pred = ptr[-linesize];
144 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize],
150 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
152 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
157 for (i = 0; i < 3; i++) {
159 int x, y, h, v, linesize;
162 linesize = frame->linesize[i];
164 for (y = 0; y < v; y++) {
165 for (x = 0; x < h; x++) {
168 ptr = frame->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
169 PREDICT(pred, ptr[-linesize - 1], ptr[-linesize], ptr[-1], predictor);
172 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
174 ff_mjpeg_encode_dc(pb, *ptr - pred, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
181 static int ljpeg_encode_yuv(AVCodecContext *avctx, PutBitContext *pb,
182 const AVFrame *frame)
184 const int predictor = avctx->prediction_method + 1;
185 LJpegEncContext *s = avctx->priv_data;
186 const int mb_width = (avctx->width + s->hsample[0] - 1) / s->hsample[0];
187 const int mb_height = (avctx->height + s->vsample[0] - 1) / s->vsample[0];
190 for (mb_y = 0; mb_y < mb_height; mb_y++) {
191 if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) <
192 mb_width * 4 * 3 * s->hsample[0] * s->vsample[0]) {
193 av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
197 for (mb_x = 0; mb_x < mb_width; mb_x++)
198 ljpeg_encode_yuv_mb(s, pb, frame, predictor, mb_x, mb_y);
204 static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
205 const AVFrame *pict, int *got_packet)
207 LJpegEncContext *s = avctx->priv_data;
209 const int width = avctx->width;
210 const int height = avctx->height;
211 const int mb_width = (width + s->hsample[0] - 1) / s->hsample[0];
212 const int mb_height = (height + s->vsample[0] - 1) / s->vsample[0];
213 int max_pkt_size = FF_MIN_BUFFER_SIZE;
214 int ret, header_bits;
216 if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
217 max_pkt_size += width * height * 3 * 3;
219 max_pkt_size += mb_width * mb_height * 3 * 4
220 * s->hsample[0] * s->vsample[0];
222 if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
223 av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
227 init_put_bits(&pb, pkt->data, pkt->size);
229 ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
232 header_bits = put_bits_count(&pb);
234 if (avctx->pix_fmt == AV_PIX_FMT_BGR24)
235 ret = ljpeg_encode_bgr(avctx, &pb, pict);
237 ret = ljpeg_encode_yuv(avctx, &pb, pict);
243 ff_mjpeg_encode_picture_trailer(&pb, header_bits);
246 pkt->size = put_bits_ptr(&pb) - pb.buf;
247 pkt->flags |= AV_PKT_FLAG_KEY;
253 static av_cold int ljpeg_encode_close(AVCodecContext *avctx)
255 LJpegEncContext *s = avctx->priv_data;
257 av_frame_free(&avctx->coded_frame);
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 = av_frame_alloc();
280 if (!avctx->coded_frame)
281 return AVERROR(ENOMEM);
283 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
284 avctx->coded_frame->key_frame = 1;
286 s->scratch = av_malloc_array(avctx->width + 1, sizeof(*s->scratch));
288 ff_idctdsp_init(&s->idsp, avctx);
289 ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
292 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift,
295 if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
296 s->vsample[0] = s->hsample[0] =
297 s->vsample[1] = s->hsample[1] =
298 s->vsample[2] = s->hsample[2] = 1;
301 s->vsample[1] = 2 >> chroma_v_shift;
302 s->vsample[2] = 2 >> chroma_v_shift;
304 s->hsample[1] = 2 >> chroma_h_shift;
305 s->hsample[2] = 2 >> chroma_h_shift;
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);
320 AVCodec ff_ljpeg_encoder = {
322 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
323 .type = AVMEDIA_TYPE_VIDEO,
324 .id = AV_CODEC_ID_LJPEG,
325 .priv_data_size = sizeof(LJpegEncContext),
326 .init = ljpeg_encode_init,
327 .encode2 = ljpeg_encode_frame,
328 .close = ljpeg_encode_close,
329 .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUVJ420P,