1/* 2 * MJPEG encoder 3 * Copyright (c) 2000, 2001 Fabrice Bellard 4 * Copyright (c) 2003 Alex Beregszaszi 5 * Copyright (c) 2003-2004 Michael Niedermayer 6 * 7 * Support for external huffman table, various fixes (AVID workaround), 8 * aspecting, new decode_frame mechanism and apple mjpeg-b support 9 * by Alex Beregszaszi 10 * 11 * This file is part of FFmpeg. 12 * 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. 17 * 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. 22 * 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 26 */ 27 28/** 29 * @file 30 * MJPEG encoder. 31 */ 32 33#include "libavutil/pixdesc.h" 34 35#include "avcodec.h" 36#include "mjpegenc_common.h" 37#include "mpegvideo.h" 38#include "mjpeg.h" 39#include "mjpegenc.h" 40 41av_cold int ff_mjpeg_encode_init(MpegEncContext *s) 42{ 43 MJpegContext *m; 44 45 if (s->width > 65500 || s->height > 65500) { 46 av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n"); 47 return AVERROR(EINVAL); 48 } 49 50 m = av_malloc(sizeof(MJpegContext)); 51 if (!m) 52 return AVERROR(ENOMEM); 53 54 s->min_qcoeff=-1023; 55 s->max_qcoeff= 1023; 56 57 /* build all the huffman tables */ 58 ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance, 59 m->huff_code_dc_luminance, 60 avpriv_mjpeg_bits_dc_luminance, 61 avpriv_mjpeg_val_dc); 62 ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance, 63 m->huff_code_dc_chrominance, 64 avpriv_mjpeg_bits_dc_chrominance, 65 avpriv_mjpeg_val_dc); 66 ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance, 67 m->huff_code_ac_luminance, 68 avpriv_mjpeg_bits_ac_luminance, 69 avpriv_mjpeg_val_ac_luminance); 70 ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance, 71 m->huff_code_ac_chrominance, 72 avpriv_mjpeg_bits_ac_chrominance, 73 avpriv_mjpeg_val_ac_chrominance); 74 75 s->mjpeg_ctx = m; 76 return 0; 77} 78 79void ff_mjpeg_encode_close(MpegEncContext *s) 80{ 81 av_free(s->mjpeg_ctx); 82} 83 84static void encode_block(MpegEncContext *s, int16_t *block, int n) 85{ 86 int mant, nbits, code, i, j; 87 int component, dc, run, last_index, val; 88 MJpegContext *m = s->mjpeg_ctx; 89 uint8_t *huff_size_ac; 90 uint16_t *huff_code_ac; 91 92 /* DC coef */ 93 component = (n <= 3 ? 0 : (n&1) + 1); 94 dc = block[0]; /* overflow is impossible */ 95 val = dc - s->last_dc[component]; 96 if (n < 4) { 97 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance); 98 huff_size_ac = m->huff_size_ac_luminance; 99 huff_code_ac = m->huff_code_ac_luminance; 100 } else { 101 ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance); 102 huff_size_ac = m->huff_size_ac_chrominance; 103 huff_code_ac = m->huff_code_ac_chrominance; 104 } 105 s->last_dc[component] = dc; 106 107 /* AC coefs */ 108 109 run = 0; 110 last_index = s->block_last_index[n]; 111 for(i=1;i<=last_index;i++) { 112 j = s->intra_scantable.permutated[i]; 113 val = block[j]; 114 if (val == 0) { 115 run++; 116 } else { 117 while (run >= 16) { 118 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]); 119 run -= 16; 120 } 121 mant = val; 122 if (val < 0) { 123 val = -val; 124 mant--; 125 } 126 127 nbits= av_log2_16bit(val) + 1; 128 code = (run << 4) | nbits; 129 130 put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]); 131 132 put_sbits(&s->pb, nbits, mant); 133 run = 0; 134 } 135 } 136 137 /* output EOB only if not already 64 values */ 138 if (last_index < 63 || run != 0) 139 put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]); 140} 141 142void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64]) 143{ 144 int i; 145 if (s->chroma_format == CHROMA_444) { 146 encode_block(s, block[0], 0); 147 encode_block(s, block[2], 2); 148 encode_block(s, block[4], 4); 149 encode_block(s, block[8], 8); 150 encode_block(s, block[5], 5); 151 encode_block(s, block[9], 9); 152 153 if (16*s->mb_x+8 < s->width) { 154 encode_block(s, block[1], 1); 155 encode_block(s, block[3], 3); 156 encode_block(s, block[6], 6); 157 encode_block(s, block[10], 10); 158 encode_block(s, block[7], 7); 159 encode_block(s, block[11], 11); 160 } 161 } else { 162 for(i=0;i<5;i++) { 163 encode_block(s, block[i], i); 164 } 165 if (s->chroma_format == CHROMA_420) { 166 encode_block(s, block[5], 5); 167 } else { 168 encode_block(s, block[6], 6); 169 encode_block(s, block[5], 5); 170 encode_block(s, block[7], 7); 171 } 172 } 173 174 s->i_tex_bits += get_bits_diff(s); 175} 176 177// maximum over s->mjpeg_vsample[i] 178#define V_MAX 2 179static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt, 180 const AVFrame *pic_arg, int *got_packet) 181 182{ 183 MpegEncContext *s = avctx->priv_data; 184 AVFrame *pic; 185 int i, ret; 186 int chroma_h_shift, chroma_v_shift; 187 188 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift); 189 190 //CODEC_FLAG_EMU_EDGE have to be cleared 191 if(s->avctx->flags & CODEC_FLAG_EMU_EDGE) 192 return AVERROR(EINVAL); 193 194 if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) { 195 av_log(avctx, AV_LOG_ERROR, 196 "Heights which are not a multiple of 16 might fail with some decoders, " 197 "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height); 198 av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos " 199 "with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n"); 200 return AVERROR_EXPERIMENTAL; 201 } 202 203 pic = av_frame_clone(pic_arg); 204 if (!pic) 205 return AVERROR(ENOMEM); 206 //picture should be flipped upside-down 207 for(i=0; i < 3; i++) { 208 int vsample = i ? 2 >> chroma_v_shift : 2; 209 pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1); 210 pic->linesize[i] *= -1; 211 } 212 ret = ff_MPV_encode_picture(avctx, pkt, pic, got_packet); 213 av_frame_free(&pic); 214 return ret; 215} 216 217#if CONFIG_MJPEG_ENCODER 218AVCodec ff_mjpeg_encoder = { 219 .name = "mjpeg", 220 .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"), 221 .type = AVMEDIA_TYPE_VIDEO, 222 .id = AV_CODEC_ID_MJPEG, 223 .priv_data_size = sizeof(MpegEncContext), 224 .init = ff_MPV_encode_init, 225 .encode2 = ff_MPV_encode_picture, 226 .close = ff_MPV_encode_end, 227 .capabilities = CODEC_CAP_SLICE_THREADS | CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY, 228 .pix_fmts = (const enum AVPixelFormat[]){ 229 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE 230 }, 231}; 232#endif 233#if CONFIG_AMV_ENCODER 234AVCodec ff_amv_encoder = { 235 .name = "amv", 236 .long_name = NULL_IF_CONFIG_SMALL("AMV Video"), 237 .type = AVMEDIA_TYPE_VIDEO, 238 .id = AV_CODEC_ID_AMV, 239 .priv_data_size = sizeof(MpegEncContext), 240 .init = ff_MPV_encode_init, 241 .encode2 = amv_encode_picture, 242 .close = ff_MPV_encode_end, 243 .pix_fmts = (const enum AVPixelFormat[]){ 244 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_NONE 245 }, 246}; 247#endif 248