FFmpeg: libavcodec/mjpegenc.c Source File

00001 /*
00002  * MJPEG encoder
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  * Copyright (c) 2003 Alex Beregszaszi
00005  * Copyright (c) 2003-2004 Michael Niedermayer
00006  *
00007  * Support for external huffman table, various fixes (AVID workaround),
00008  * aspecting, new decode_frame mechanism and apple mjpeg-b support
00009  *                                  by Alex Beregszaszi
00010  *
00011  * This file is part of FFmpeg.
00012  *
00013  * FFmpeg is free software; you can redistribute it and/or
00014  * modify it under the terms of the GNU Lesser General Public
00015  * License as published by the Free Software Foundation; either
00016  * version 2.1 of the License, or (at your option) any later version.
00017  *
00018  * FFmpeg is distributed in the hope that it will be useful,
00019  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00020  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00021  * Lesser General Public License for more details.
00022  *
00023  * You should have received a copy of the GNU Lesser General Public
00024  * License along with FFmpeg; if not, write to the Free Software
00025  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00026  */
00027 
00033 //#define DEBUG
00034 #include <assert.h>
00035 
00036 #include "avcodec.h"
00037 #include "dsputil.h"
00038 #include "mpegvideo.h"
00039 #include "mjpeg.h"
00040 #include "mjpegenc.h"
00041 
00042 /* use two quantizer tables (one for luminance and one for chrominance) */
00043 /* not yet working */
00044 #undef TWOMATRIXES
00045 
00046 
00047 av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
00048 {
00049     MJpegContext *m;
00050 
00051     m = av_malloc(sizeof(MJpegContext));
00052     if (!m)
00053         return -1;
00054 
00055     s->min_qcoeff=-1023;
00056     s->max_qcoeff= 1023;
00057 
00058     /* build all the huffman tables */
00059     ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
00060                                  m->huff_code_dc_luminance,
00061                                  ff_mjpeg_bits_dc_luminance,
00062                                  ff_mjpeg_val_dc);
00063     ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
00064                                  m->huff_code_dc_chrominance,
00065                                  ff_mjpeg_bits_dc_chrominance,
00066                                  ff_mjpeg_val_dc);
00067     ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
00068                                  m->huff_code_ac_luminance,
00069                                  ff_mjpeg_bits_ac_luminance,
00070                                  ff_mjpeg_val_ac_luminance);
00071     ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
00072                                  m->huff_code_ac_chrominance,
00073                                  ff_mjpeg_bits_ac_chrominance,
00074                                  ff_mjpeg_val_ac_chrominance);
00075 
00076     s->mjpeg_ctx = m;
00077     return 0;
00078 }
00079 
00080 void ff_mjpeg_encode_close(MpegEncContext *s)
00081 {
00082     av_free(s->mjpeg_ctx);
00083 }
00084 
00085 /* table_class: 0 = DC coef, 1 = AC coefs */
00086 static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
00087                              const uint8_t *bits_table, const uint8_t *value_table)
00088 {
00089     PutBitContext *p = &s->pb;
00090     int n, i;
00091 
00092     put_bits(p, 4, table_class);
00093     put_bits(p, 4, table_id);
00094 
00095     n = 0;
00096     for(i=1;i<=16;i++) {
00097         n += bits_table[i];
00098         put_bits(p, 8, bits_table[i]);
00099     }
00100 
00101     for(i=0;i<n;i++)
00102         put_bits(p, 8, value_table[i]);
00103 
00104     return n + 17;
00105 }
00106 
00107 static void jpeg_table_header(MpegEncContext *s)
00108 {
00109     PutBitContext *p = &s->pb;
00110     int i, j, size;
00111     uint8_t *ptr;
00112 
00113     /* quant matrixes */
00114     put_marker(p, DQT);
00115 #ifdef TWOMATRIXES
00116     put_bits(p, 16, 2 + 2 * (1 + 64));
00117 #else
00118     put_bits(p, 16, 2 + 1 * (1 + 64));
00119 #endif
00120     put_bits(p, 4, 0); /* 8 bit precision */
00121     put_bits(p, 4, 0); /* table 0 */
00122     for(i=0;i<64;i++) {
00123         j = s->intra_scantable.permutated[i];
00124         put_bits(p, 8, s->intra_matrix[j]);
00125     }
00126 #ifdef TWOMATRIXES
00127     put_bits(p, 4, 0); /* 8 bit precision */
00128     put_bits(p, 4, 1); /* table 1 */
00129     for(i=0;i<64;i++) {
00130         j = s->intra_scantable.permutated[i];
00131         put_bits(p, 8, s->chroma_intra_matrix[j]);
00132     }
00133 #endif
00134 
00135     /* huffman table */
00136     put_marker(p, DHT);
00137     flush_put_bits(p);
00138     ptr = put_bits_ptr(p);
00139     put_bits(p, 16, 0); /* patched later */
00140     size = 2;
00141     size += put_huffman_table(s, 0, 0, ff_mjpeg_bits_dc_luminance,
00142                               ff_mjpeg_val_dc);
00143     size += put_huffman_table(s, 0, 1, ff_mjpeg_bits_dc_chrominance,
00144                               ff_mjpeg_val_dc);
00145 
00146     size += put_huffman_table(s, 1, 0, ff_mjpeg_bits_ac_luminance,
00147                               ff_mjpeg_val_ac_luminance);
00148     size += put_huffman_table(s, 1, 1, ff_mjpeg_bits_ac_chrominance,
00149                               ff_mjpeg_val_ac_chrominance);
00150     AV_WB16(ptr, size);
00151 }
00152 
00153 static void jpeg_put_comments(MpegEncContext *s)
00154 {
00155     PutBitContext *p = &s->pb;
00156     int size;
00157     uint8_t *ptr;
00158 
00159     if (s->avctx->sample_aspect_ratio.num /* && !lossless */)
00160     {
00161     /* JFIF header */
00162     put_marker(p, APP0);
00163     put_bits(p, 16, 16);
00164     ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
00165     put_bits(p, 16, 0x0102); /* v 1.02 */
00166     put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
00167     put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
00168     put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
00169     put_bits(p, 8, 0); /* thumbnail width */
00170     put_bits(p, 8, 0); /* thumbnail height */
00171     }
00172 
00173     /* comment */
00174     if(!(s->flags & CODEC_FLAG_BITEXACT)){
00175         put_marker(p, COM);
00176         flush_put_bits(p);
00177         ptr = put_bits_ptr(p);
00178         put_bits(p, 16, 0); /* patched later */
00179         ff_put_string(p, LIBAVCODEC_IDENT, 1);
00180         size = strlen(LIBAVCODEC_IDENT)+3;
00181         AV_WB16(ptr, size);
00182     }
00183 
00184     if(  s->avctx->pix_fmt == PIX_FMT_YUV420P
00185        ||s->avctx->pix_fmt == PIX_FMT_YUV422P
00186        ||s->avctx->pix_fmt == PIX_FMT_YUV444P){
00187         put_marker(p, COM);
00188         flush_put_bits(p);
00189         ptr = put_bits_ptr(p);
00190         put_bits(p, 16, 0); /* patched later */
00191         ff_put_string(p, "CS=ITU601", 1);
00192         size = strlen("CS=ITU601")+3;
00193         AV_WB16(ptr, size);
00194     }
00195 }
00196 
00197 void ff_mjpeg_encode_picture_header(MpegEncContext *s)
00198 {
00199     const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
00200 
00201     put_marker(&s->pb, SOI);
00202 
00203     // hack for AMV mjpeg format
00204     if(s->avctx->codec_id == CODEC_ID_AMV) return;
00205 
00206     jpeg_put_comments(s);
00207 
00208     jpeg_table_header(s);
00209 
00210     switch(s->avctx->codec_id){
00211     case CODEC_ID_MJPEG:  put_marker(&s->pb, SOF0 ); break;
00212     case CODEC_ID_LJPEG:  put_marker(&s->pb, SOF3 ); break;
00213     default: assert(0);
00214     }
00215 
00216     put_bits(&s->pb, 16, 17);
00217     if(lossless && (s->avctx->pix_fmt == PIX_FMT_BGR0
00218                     || s->avctx->pix_fmt == PIX_FMT_BGRA
00219                     || s->avctx->pix_fmt == PIX_FMT_BGR24))
00220         put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
00221     else
00222         put_bits(&s->pb, 8, 8); /* 8 bits/component */
00223     put_bits(&s->pb, 16, s->height);
00224     put_bits(&s->pb, 16, s->width);
00225     put_bits(&s->pb, 8, 3); /* 3 components */
00226 
00227     /* Y component */
00228     put_bits(&s->pb, 8, 1); /* component number */
00229     put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
00230     put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
00231     put_bits(&s->pb, 8, 0); /* select matrix */
00232 
00233     /* Cb component */
00234     put_bits(&s->pb, 8, 2); /* component number */
00235     put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
00236     put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
00237 #ifdef TWOMATRIXES
00238     put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
00239 #else
00240     put_bits(&s->pb, 8, 0); /* select matrix */
00241 #endif
00242 
00243     /* Cr component */
00244     put_bits(&s->pb, 8, 3); /* component number */
00245     put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
00246     put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
00247 #ifdef TWOMATRIXES
00248     put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
00249 #else
00250     put_bits(&s->pb, 8, 0); /* select matrix */
00251 #endif
00252 
00253     /* scan header */
00254     put_marker(&s->pb, SOS);
00255     put_bits(&s->pb, 16, 12); /* length */
00256     put_bits(&s->pb, 8, 3); /* 3 components */
00257 
00258     /* Y component */
00259     put_bits(&s->pb, 8, 1); /* index */
00260     put_bits(&s->pb, 4, 0); /* DC huffman table index */
00261     put_bits(&s->pb, 4, 0); /* AC huffman table index */
00262 
00263     /* Cb component */
00264     put_bits(&s->pb, 8, 2); /* index */
00265     put_bits(&s->pb, 4, 1); /* DC huffman table index */
00266     put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
00267 
00268     /* Cr component */
00269     put_bits(&s->pb, 8, 3); /* index */
00270     put_bits(&s->pb, 4, 1); /* DC huffman table index */
00271     put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
00272 
00273     put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
00274 
00275     switch(s->avctx->codec_id){
00276     case CODEC_ID_MJPEG:  put_bits(&s->pb, 8, 63); break; /* Se (not used) */
00277     case CODEC_ID_LJPEG:  put_bits(&s->pb, 8,  0); break; /* not used */
00278     default: assert(0);
00279     }
00280 
00281     put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
00282 }
00283 
00284 static void escape_FF(MpegEncContext *s, int start)
00285 {
00286     int size= put_bits_count(&s->pb) - start*8;
00287     int i, ff_count;
00288     uint8_t *buf= s->pb.buf + start;
00289     int align= (-(size_t)(buf))&3;
00290 
00291     assert((size&7) == 0);
00292     size >>= 3;
00293 
00294     ff_count=0;
00295     for(i=0; i<size && i<align; i++){
00296         if(buf[i]==0xFF) ff_count++;
00297     }
00298     for(; i<size-15; i+=16){
00299         int acc, v;
00300 
00301         v= *(uint32_t*)(&buf[i]);
00302         acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
00303         v= *(uint32_t*)(&buf[i+4]);
00304         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
00305         v= *(uint32_t*)(&buf[i+8]);
00306         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
00307         v= *(uint32_t*)(&buf[i+12]);
00308         acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
00309 
00310         acc>>=4;
00311         acc+= (acc>>16);
00312         acc+= (acc>>8);
00313         ff_count+= acc&0xFF;
00314     }
00315     for(; i<size; i++){
00316         if(buf[i]==0xFF) ff_count++;
00317     }
00318 
00319     if(ff_count==0) return;
00320 
00321     flush_put_bits(&s->pb);
00322     skip_put_bytes(&s->pb, ff_count);
00323 
00324     for(i=size-1; ff_count; i--){
00325         int v= buf[i];
00326 
00327         if(v==0xFF){
00328 //printf("%d %d\n", i, ff_count);
00329             buf[i+ff_count]= 0;
00330             ff_count--;
00331         }
00332 
00333         buf[i+ff_count]= v;
00334     }
00335 }
00336 
00337 void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
00338 {
00339     int length;
00340     length= (-put_bits_count(pbc))&7;
00341     if(length) put_bits(pbc, length, (1<<length)-1);
00342 }
00343 
00344 void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
00345 {
00346     ff_mjpeg_encode_stuffing(&s->pb);
00347     flush_put_bits(&s->pb);
00348 
00349     assert((s->header_bits&7)==0);
00350 
00351     escape_FF(s, s->header_bits>>3);
00352 
00353     put_marker(&s->pb, EOI);
00354 }
00355 
00356 void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
00357                         uint8_t *huff_size, uint16_t *huff_code)
00358 {
00359     int mant, nbits;
00360 
00361     if (val == 0) {
00362         put_bits(&s->pb, huff_size[0], huff_code[0]);
00363     } else {
00364         mant = val;
00365         if (val < 0) {
00366             val = -val;
00367             mant--;
00368         }
00369 
00370         nbits= av_log2_16bit(val) + 1;
00371 
00372         put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
00373 
00374         put_sbits(&s->pb, nbits, mant);
00375     }
00376 }
00377 
00378 static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
00379 {
00380     int mant, nbits, code, i, j;
00381     int component, dc, run, last_index, val;
00382     MJpegContext *m = s->mjpeg_ctx;
00383     uint8_t *huff_size_ac;
00384     uint16_t *huff_code_ac;
00385 
00386     /* DC coef */
00387     component = (n <= 3 ? 0 : (n&1) + 1);
00388     dc = block[0]; /* overflow is impossible */
00389     val = dc - s->last_dc[component];
00390     if (n < 4) {
00391         ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
00392         huff_size_ac = m->huff_size_ac_luminance;
00393         huff_code_ac = m->huff_code_ac_luminance;
00394     } else {
00395         ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
00396         huff_size_ac = m->huff_size_ac_chrominance;
00397         huff_code_ac = m->huff_code_ac_chrominance;
00398     }
00399     s->last_dc[component] = dc;
00400 
00401     /* AC coefs */
00402 
00403     run = 0;
00404     last_index = s->block_last_index[n];
00405     for(i=1;i<=last_index;i++) {
00406         j = s->intra_scantable.permutated[i];
00407         val = block[j];
00408         if (val == 0) {
00409             run++;
00410         } else {
00411             while (run >= 16) {
00412                 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
00413                 run -= 16;
00414             }
00415             mant = val;
00416             if (val < 0) {
00417                 val = -val;
00418                 mant--;
00419             }
00420 
00421             nbits= av_log2(val) + 1;
00422             code = (run << 4) | nbits;
00423 
00424             put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
00425 
00426             put_sbits(&s->pb, nbits, mant);
00427             run = 0;
00428         }
00429     }
00430 
00431     /* output EOB only if not already 64 values */
00432     if (last_index < 63 || run != 0)
00433         put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
00434 }
00435 
00436 void ff_mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64])
00437 {
00438     int i;
00439     for(i=0;i<5;i++) {
00440         encode_block(s, block[i], i);
00441     }
00442     if (s->chroma_format == CHROMA_420) {
00443         encode_block(s, block[5], 5);
00444     } else {
00445         encode_block(s, block[6], 6);
00446         encode_block(s, block[5], 5);
00447         encode_block(s, block[7], 7);
00448     }
00449 
00450     s->i_tex_bits += get_bits_diff(s);
00451 }
00452 
00453 // maximum over s->mjpeg_vsample[i]
00454 #define V_MAX 2
00455 static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
00456                               const AVFrame *pic_arg, int *got_packet)
00457 
00458 {
00459     MpegEncContext *s = avctx->priv_data;
00460     AVFrame pic = *pic_arg;
00461     int i;
00462 
00463     //CODEC_FLAG_EMU_EDGE have to be cleared
00464     if(s->avctx->flags & CODEC_FLAG_EMU_EDGE)
00465         return -1;
00466 
00467     //picture should be flipped upside-down
00468     for(i=0; i < 3; i++) {
00469         pic.data[i] += (pic.linesize[i] * (s->mjpeg_vsample[i] * (8 * s->mb_height -((s->height/V_MAX)&7)) - 1 ));
00470         pic.linesize[i] *= -1;
00471     }
00472     return ff_MPV_encode_picture(avctx, pkt, &pic, got_packet);
00473 }
00474 
00475 AVCodec ff_mjpeg_encoder = {
00476     .name           = "mjpeg",
00477     .type           = AVMEDIA_TYPE_VIDEO,
00478     .id             = CODEC_ID_MJPEG,
00479     .priv_data_size = sizeof(MpegEncContext),
00480     .init           = ff_MPV_encode_init,
00481     .encode2        = ff_MPV_encode_picture,
00482     .close          = ff_MPV_encode_end,
00483     .pix_fmts       = (const enum PixelFormat[]){
00484         PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_NONE
00485     },
00486     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
00487 };
00488 
00489 AVCodec ff_amv_encoder = {
00490     .name           = "amv",
00491     .type           = AVMEDIA_TYPE_VIDEO,
00492     .id             = CODEC_ID_AMV,
00493     .priv_data_size = sizeof(MpegEncContext),
00494     .init           = ff_MPV_encode_init,
00495     .encode2        = amv_encode_picture,
00496     .close          = ff_MPV_encode_end,
00497     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_NONE},
00498     .long_name      = NULL_IF_CONFIG_SMALL("AMV Video"),
00499 };