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
33 #include "libavutil/pixdesc.h"
36 #include "jpegtables.h"
37 #include "mjpegenc_common.h"
38 #include "mpegvideo.h"
42 static uint8_t uni_ac_vlc_len[64 * 64 * 2];
43 static uint8_t uni_chroma_ac_vlc_len[64 * 64 * 2];
45 static av_cold void init_uni_ac_vlc(const uint8_t huff_size_ac[256], uint8_t *uni_ac_vlc_len)
49 for (i = 0; i < 128; i++) {
54 for (run = 0; run < 64; run++) {
56 int alevel = FFABS(level);
58 len = (run >> 4) * huff_size_ac[0xf0];
60 nbits= av_log2_16bit(alevel) + 1;
61 code = ((15&run) << 4) | nbits;
63 len += huff_size_ac[code] + nbits;
65 uni_ac_vlc_len[UNI_AC_ENC_INDEX(run, i)] = len;
66 // We ignore EOB as its just a constant which does not change generally
71 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
75 if (s->width > 65500 || s->height > 65500) {
76 av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
77 return AVERROR(EINVAL);
80 m = av_malloc(sizeof(MJpegContext));
82 return AVERROR(ENOMEM);
87 /* build all the huffman tables */
88 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
89 m->huff_code_dc_luminance,
90 avpriv_mjpeg_bits_dc_luminance,
92 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
93 m->huff_code_dc_chrominance,
94 avpriv_mjpeg_bits_dc_chrominance,
96 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
97 m->huff_code_ac_luminance,
98 avpriv_mjpeg_bits_ac_luminance,
99 avpriv_mjpeg_val_ac_luminance);
100 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
101 m->huff_code_ac_chrominance,
102 avpriv_mjpeg_bits_ac_chrominance,
103 avpriv_mjpeg_val_ac_chrominance);
105 init_uni_ac_vlc(m->huff_size_ac_luminance, uni_ac_vlc_len);
106 init_uni_ac_vlc(m->huff_size_ac_chrominance, uni_chroma_ac_vlc_len);
107 s->intra_ac_vlc_length =
108 s->intra_ac_vlc_last_length = uni_ac_vlc_len;
109 s->intra_chroma_ac_vlc_length =
110 s->intra_chroma_ac_vlc_last_length = uni_chroma_ac_vlc_len;
116 av_cold void ff_mjpeg_encode_close(MpegEncContext *s)
118 av_freep(&s->mjpeg_ctx);
121 static void encode_block(MpegEncContext *s, int16_t *block, int n)
123 int mant, nbits, code, i, j;
124 int component, dc, run, last_index, val;
125 MJpegContext *m = s->mjpeg_ctx;
126 uint8_t *huff_size_ac;
127 uint16_t *huff_code_ac;
130 component = (n <= 3 ? 0 : (n&1) + 1);
131 dc = block[0]; /* overflow is impossible */
132 val = dc - s->last_dc[component];
134 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
135 huff_size_ac = m->huff_size_ac_luminance;
136 huff_code_ac = m->huff_code_ac_luminance;
138 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
139 huff_size_ac = m->huff_size_ac_chrominance;
140 huff_code_ac = m->huff_code_ac_chrominance;
142 s->last_dc[component] = dc;
147 last_index = s->block_last_index[n];
148 for(i=1;i<=last_index;i++) {
149 j = s->intra_scantable.permutated[i];
155 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
164 nbits= av_log2_16bit(val) + 1;
165 code = (run << 4) | nbits;
167 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
169 put_sbits(&s->pb, nbits, mant);
174 /* output EOB only if not already 64 values */
175 if (last_index < 63 || run != 0)
176 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
179 void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64])
182 if (s->chroma_format == CHROMA_444) {
183 encode_block(s, block[0], 0);
184 encode_block(s, block[2], 2);
185 encode_block(s, block[4], 4);
186 encode_block(s, block[8], 8);
187 encode_block(s, block[5], 5);
188 encode_block(s, block[9], 9);
190 if (16*s->mb_x+8 < s->width) {
191 encode_block(s, block[1], 1);
192 encode_block(s, block[3], 3);
193 encode_block(s, block[6], 6);
194 encode_block(s, block[10], 10);
195 encode_block(s, block[7], 7);
196 encode_block(s, block[11], 11);
200 encode_block(s, block[i], i);
202 if (s->chroma_format == CHROMA_420) {
203 encode_block(s, block[5], 5);
205 encode_block(s, block[6], 6);
206 encode_block(s, block[5], 5);
207 encode_block(s, block[7], 7);
211 s->i_tex_bits += get_bits_diff(s);
214 // maximum over s->mjpeg_vsample[i]
216 static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
217 const AVFrame *pic_arg, int *got_packet)
220 MpegEncContext *s = avctx->priv_data;
223 int chroma_h_shift, chroma_v_shift;
225 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
227 //CODEC_FLAG_EMU_EDGE have to be cleared
228 if(s->avctx->flags & CODEC_FLAG_EMU_EDGE)
229 return AVERROR(EINVAL);
231 if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
232 av_log(avctx, AV_LOG_ERROR,
233 "Heights which are not a multiple of 16 might fail with some decoders, "
234 "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height);
235 av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos "
236 "with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n");
237 return AVERROR_EXPERIMENTAL;
240 pic = av_frame_clone(pic_arg);
242 return AVERROR(ENOMEM);
243 //picture should be flipped upside-down
244 for(i=0; i < 3; i++) {
245 int vsample = i ? 2 >> chroma_v_shift : 2;
246 pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1);
247 pic->linesize[i] *= -1;
249 ret = ff_mpv_encode_picture(avctx, pkt, pic, got_packet);
254 #if CONFIG_MJPEG_ENCODER
256 static const AVClass mjpeg_class = {
257 .class_name = "mjpeg encoder",
258 .item_name = av_default_item_name,
259 .option = ff_mpv_generic_options,
260 .version = LIBAVUTIL_VERSION_INT,
263 AVCodec ff_mjpeg_encoder = {
265 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
266 .type = AVMEDIA_TYPE_VIDEO,
267 .id = AV_CODEC_ID_MJPEG,
268 .priv_data_size = sizeof(MpegEncContext),
269 .init = ff_mpv_encode_init,
270 .encode2 = ff_mpv_encode_picture,
271 .close = ff_mpv_encode_end,
272 .capabilities = AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
273 .pix_fmts = (const enum AVPixelFormat[]){
274 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE
276 .priv_class = &mjpeg_class,
279 #if CONFIG_AMV_ENCODER
280 static const AVClass amv_class = {
281 .class_name = "amv encoder",
282 .item_name = av_default_item_name,
283 .option = ff_mpv_generic_options,
284 .version = LIBAVUTIL_VERSION_INT,
287 AVCodec ff_amv_encoder = {
289 .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
290 .type = AVMEDIA_TYPE_VIDEO,
291 .id = AV_CODEC_ID_AMV,
292 .priv_data_size = sizeof(MpegEncContext),
293 .init = ff_mpv_encode_init,
294 .encode2 = amv_encode_picture,
295 .close = ff_mpv_encode_end,
296 .pix_fmts = (const enum AVPixelFormat[]){
297 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_NONE
299 .priv_class = &amv_class,