| 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 | |
| 41 | av_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 | |
| 79 | void ff_mjpeg_encode_close(MpegEncContext *s) |
| 80 | { |
| 81 | av_free(s->mjpeg_ctx); |
| 82 | } |
| 83 | |
| 84 | static 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 | |
| 142 | void 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 |
| 179 | static 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 |
| 218 | AVCodec 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 |
| 234 | AVCodec 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_NONE |
| 245 | }, |
| 246 | }; |
| 247 | #endif |