/* * MJPEG encoder * Copyright (c) 2000, 2001 Fabrice Bellard. * Copyright (c) 2003 Alex Beregszaszi * Copyright (c) 2003-2004 Michael Niedermayer * * Support for external huffman table, various fixes (AVID workaround), * aspecting, new decode_frame mechanism and apple mjpeg-b support * by Alex Beregszaszi * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file mjpegenc.c * MJPEG encoder. */ //#define DEBUG #include <assert.h> #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" #include "mjpeg.h" #include "mjpegenc.h" /* use two quantizer tables (one for luminance and one for chrominance) */ /* not yet working */ #undef TWOMATRIXES int ff_mjpeg_encode_init(MpegEncContext *s) { MJpegContext *m; m = av_malloc(sizeof(MJpegContext)); if (!m) return -1; s->min_qcoeff=-1023; s->max_qcoeff= 1023; /* build all the huffman tables */ ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance, m->huff_code_dc_luminance, ff_mjpeg_bits_dc_luminance, ff_mjpeg_val_dc_luminance); ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance, m->huff_code_dc_chrominance, ff_mjpeg_bits_dc_chrominance, ff_mjpeg_val_dc_chrominance); ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance, m->huff_code_ac_luminance, ff_mjpeg_bits_ac_luminance, ff_mjpeg_val_ac_luminance); ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance, m->huff_code_ac_chrominance, ff_mjpeg_bits_ac_chrominance, ff_mjpeg_val_ac_chrominance); s->mjpeg_ctx = m; return 0; } void ff_mjpeg_encode_close(MpegEncContext *s) { av_free(s->mjpeg_ctx); } /* table_class: 0 = DC coef, 1 = AC coefs */ static int put_huffman_table(MpegEncContext *s, int table_class, int table_id, const uint8_t *bits_table, const uint8_t *value_table) { PutBitContext *p = &s->pb; int n, i; put_bits(p, 4, table_class); put_bits(p, 4, table_id); n = 0; for(i=1;i<=16;i++) { n += bits_table[i]; put_bits(p, 8, bits_table[i]); } for(i=0;i<n;i++) put_bits(p, 8, value_table[i]); return n + 17; } static void jpeg_table_header(MpegEncContext *s) { PutBitContext *p = &s->pb; int i, j, size; uint8_t *ptr; /* quant matrixes */ put_marker(p, DQT); #ifdef TWOMATRIXES put_bits(p, 16, 2 + 2 * (1 + 64)); #else put_bits(p, 16, 2 + 1 * (1 + 64)); #endif put_bits(p, 4, 0); /* 8 bit precision */ put_bits(p, 4, 0); /* table 0 */ for(i=0;i<64;i++) { j = s->intra_scantable.permutated[i]; put_bits(p, 8, s->intra_matrix[j]); } #ifdef TWOMATRIXES put_bits(p, 4, 0); /* 8 bit precision */ put_bits(p, 4, 1); /* table 1 */ for(i=0;i<64;i++) { j = s->intra_scantable.permutated[i]; put_bits(p, 8, s->chroma_intra_matrix[j]); } #endif /* huffman table */ put_marker(p, DHT); flush_put_bits(p); ptr = pbBufPtr(p); put_bits(p, 16, 0); /* patched later */ size = 2; size += put_huffman_table(s, 0, 0, ff_mjpeg_bits_dc_luminance, ff_mjpeg_val_dc_luminance); size += put_huffman_table(s, 0, 1, ff_mjpeg_bits_dc_chrominance, ff_mjpeg_val_dc_chrominance); size += put_huffman_table(s, 1, 0, ff_mjpeg_bits_ac_luminance, ff_mjpeg_val_ac_luminance); size += put_huffman_table(s, 1, 1, ff_mjpeg_bits_ac_chrominance, ff_mjpeg_val_ac_chrominance); AV_WB16(ptr, size); } static void jpeg_put_comments(MpegEncContext *s) { PutBitContext *p = &s->pb; int size; uint8_t *ptr; if (s->aspect_ratio_info /* && !lossless */) { /* JFIF header */ put_marker(p, APP0); put_bits(p, 16, 16); ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */ put_bits(p, 16, 0x0201); /* v 1.02 */ put_bits(p, 8, 0); /* units type: 0 - aspect ratio */ put_bits(p, 16, s->avctx->sample_aspect_ratio.num); put_bits(p, 16, s->avctx->sample_aspect_ratio.den); put_bits(p, 8, 0); /* thumbnail width */ put_bits(p, 8, 0); /* thumbnail height */ } /* comment */ if(!(s->flags & CODEC_FLAG_BITEXACT)){ put_marker(p, COM); flush_put_bits(p); ptr = pbBufPtr(p); put_bits(p, 16, 0); /* patched later */ ff_put_string(p, LIBAVCODEC_IDENT, 1); size = strlen(LIBAVCODEC_IDENT)+3; AV_WB16(ptr, size); } if( s->avctx->pix_fmt == PIX_FMT_YUV420P ||s->avctx->pix_fmt == PIX_FMT_YUV422P ||s->avctx->pix_fmt == PIX_FMT_YUV444P){ put_marker(p, COM); flush_put_bits(p); ptr = pbBufPtr(p); put_bits(p, 16, 0); /* patched later */ ff_put_string(p, "CS=ITU601", 1); size = strlen("CS=ITU601")+3; AV_WB16(ptr, size); } } void ff_mjpeg_encode_picture_header(MpegEncContext *s) { const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG; put_marker(&s->pb, SOI); jpeg_put_comments(s); jpeg_table_header(s); switch(s->avctx->codec_id){ case CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break; case CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break; default: assert(0); } put_bits(&s->pb, 16, 17); if(lossless && s->avctx->pix_fmt == PIX_FMT_RGB32) put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */ else put_bits(&s->pb, 8, 8); /* 8 bits/component */ put_bits(&s->pb, 16, s->height); put_bits(&s->pb, 16, s->width); put_bits(&s->pb, 8, 3); /* 3 components */ /* Y component */ put_bits(&s->pb, 8, 1); /* component number */ put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */ put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */ put_bits(&s->pb, 8, 0); /* select matrix */ /* Cb component */ put_bits(&s->pb, 8, 2); /* component number */ put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */ put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */ #ifdef TWOMATRIXES put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */ #else put_bits(&s->pb, 8, 0); /* select matrix */ #endif /* Cr component */ put_bits(&s->pb, 8, 3); /* component number */ put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */ put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */ #ifdef TWOMATRIXES put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */ #else put_bits(&s->pb, 8, 0); /* select matrix */ #endif /* scan header */ put_marker(&s->pb, SOS); put_bits(&s->pb, 16, 12); /* length */ put_bits(&s->pb, 8, 3); /* 3 components */ /* Y component */ put_bits(&s->pb, 8, 1); /* index */ put_bits(&s->pb, 4, 0); /* DC huffman table index */ put_bits(&s->pb, 4, 0); /* AC huffman table index */ /* Cb component */ put_bits(&s->pb, 8, 2); /* index */ put_bits(&s->pb, 4, 1); /* DC huffman table index */ put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */ /* Cr component */ put_bits(&s->pb, 8, 3); /* index */ put_bits(&s->pb, 4, 1); /* DC huffman table index */ put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */ put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */ switch(s->avctx->codec_id){ case CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */ case CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */ default: assert(0); } put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */ } static void escape_FF(MpegEncContext *s, int start) { int size= put_bits_count(&s->pb) - start*8; int i, ff_count; uint8_t *buf= s->pb.buf + start; int align= (-(size_t)(buf))&3; assert((size&7) == 0); size >>= 3; ff_count=0; for(i=0; i<size && i<align; i++){ if(buf[i]==0xFF) ff_count++; } for(; i<size-15; i+=16){ int acc, v; v= *(uint32_t*)(&buf[i]); acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; v= *(uint32_t*)(&buf[i+4]); acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; v= *(uint32_t*)(&buf[i+8]); acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; v= *(uint32_t*)(&buf[i+12]); acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010; acc>>=4; acc+= (acc>>16); acc+= (acc>>8); ff_count+= acc&0xFF; } for(; i<size; i++){ if(buf[i]==0xFF) ff_count++; } if(ff_count==0) return; /* skip put bits */ for(i=0; i<ff_count-3; i+=4) put_bits(&s->pb, 32, 0); put_bits(&s->pb, (ff_count-i)*8, 0); flush_put_bits(&s->pb); for(i=size-1; ff_count; i--){ int v= buf[i]; if(v==0xFF){ //printf("%d %d\n", i, ff_count); buf[i+ff_count]= 0; ff_count--; } buf[i+ff_count]= v; } } void ff_mjpeg_encode_stuffing(PutBitContext * pbc) { int length; length= (-put_bits_count(pbc))&7; if(length) put_bits(pbc, length, (1<<length)-1); } void ff_mjpeg_encode_picture_trailer(MpegEncContext *s) { ff_mjpeg_encode_stuffing(&s->pb); flush_put_bits(&s->pb); assert((s->header_bits&7)==0); escape_FF(s, s->header_bits>>3); put_marker(&s->pb, EOI); } void ff_mjpeg_encode_dc(MpegEncContext *s, int val, uint8_t *huff_size, uint16_t *huff_code) { int mant, nbits; if (val == 0) { put_bits(&s->pb, huff_size[0], huff_code[0]); } else { mant = val; if (val < 0) { val = -val; mant--; } nbits= av_log2_16bit(val) + 1; put_bits(&s->pb, huff_size[nbits], huff_code[nbits]); put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1)); } } static void encode_block(MpegEncContext *s, DCTELEM *block, int n) { int mant, nbits, code, i, j; int component, dc, run, last_index, val; MJpegContext *m = s->mjpeg_ctx; uint8_t *huff_size_ac; uint16_t *huff_code_ac; /* DC coef */ component = (n <= 3 ? 0 : (n&1) + 1); dc = block[0]; /* overflow is impossible */ val = dc - s->last_dc[component]; if (n < 4) { ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance); huff_size_ac = m->huff_size_ac_luminance; huff_code_ac = m->huff_code_ac_luminance; } else { ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance); huff_size_ac = m->huff_size_ac_chrominance; huff_code_ac = m->huff_code_ac_chrominance; } s->last_dc[component] = dc; /* AC coefs */ run = 0; last_index = s->block_last_index[n]; for(i=1;i<=last_index;i++) { j = s->intra_scantable.permutated[i]; val = block[j]; if (val == 0) { run++; } else { while (run >= 16) { put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]); run -= 16; } mant = val; if (val < 0) { val = -val; mant--; } nbits= av_log2(val) + 1; code = (run << 4) | nbits; put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]); put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1)); run = 0; } } /* output EOB only if not already 64 values */ if (last_index < 63 || run != 0) put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]); } void ff_mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64]) { int i; for(i=0;i<5;i++) { encode_block(s, block[i], i); } if (s->chroma_format == CHROMA_420) { encode_block(s, block[5], 5); } else { encode_block(s, block[6], 6); encode_block(s, block[5], 5); encode_block(s, block[7], 7); } } AVCodec mjpeg_encoder = { "mjpeg", CODEC_TYPE_VIDEO, CODEC_ID_MJPEG, sizeof(MpegEncContext), MPV_encode_init, MPV_encode_picture, MPV_encode_end, .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, -1}, };