/* * lossless JPEG shared bits * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdint.h> #include <string.h> #include "libavutil/common.h" #include "libavutil/pixdesc.h" #include "libavutil/pixfmt.h" #include "avcodec.h" #include "idctdsp.h" #include "jpegtables.h" #include "put_bits.h" #include "mjpegenc.h" #include "mjpegenc_common.h" #include "mjpeg.h" /* table_class: 0 = DC coef, 1 = AC coefs */ static int put_huffman_table(PutBitContext *p, int table_class, int table_id, const uint8_t *bits_table, const uint8_t *value_table) { 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(PutBitContext *p, ScanTable *intra_scantable, uint16_t intra_matrix[64]) { int i, j, size; uint8_t *ptr; /* quant matrixes */ put_marker(p, DQT); put_bits(p, 16, 2 + 1 * (1 + 64)); put_bits(p, 4, 0); /* 8 bit precision */ put_bits(p, 4, 0); /* table 0 */ for(i=0;i<64;i++) { j = intra_scantable->permutated[i]; put_bits(p, 8, intra_matrix[j]); } /* huffman table */ put_marker(p, DHT); flush_put_bits(p); ptr = put_bits_ptr(p); put_bits(p, 16, 0); /* patched later */ size = 2; size += put_huffman_table(p, 0, 0, avpriv_mjpeg_bits_dc_luminance, avpriv_mjpeg_val_dc); size += put_huffman_table(p, 0, 1, avpriv_mjpeg_bits_dc_chrominance, avpriv_mjpeg_val_dc); size += put_huffman_table(p, 1, 0, avpriv_mjpeg_bits_ac_luminance, avpriv_mjpeg_val_ac_luminance); size += put_huffman_table(p, 1, 1, avpriv_mjpeg_bits_ac_chrominance, avpriv_mjpeg_val_ac_chrominance); AV_WB16(ptr, size); } static void jpeg_put_comments(AVCodecContext *avctx, PutBitContext *p) { int size; uint8_t *ptr; if (avctx->sample_aspect_ratio.num > 0 && avctx->sample_aspect_ratio.den > 0) { /* JFIF header */ put_marker(p, APP0); put_bits(p, 16, 16); avpriv_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */ /* The most significant byte is used for major revisions, the least * significant byte for minor revisions. Version 1.02 is the current * released revision. */ put_bits(p, 16, 0x0102); put_bits(p, 8, 0); /* units type: 0 - aspect ratio */ put_bits(p, 16, avctx->sample_aspect_ratio.num); put_bits(p, 16, avctx->sample_aspect_ratio.den); put_bits(p, 8, 0); /* thumbnail width */ put_bits(p, 8, 0); /* thumbnail height */ } /* comment */ if (!(avctx->flags & AV_CODEC_FLAG_BITEXACT)) { put_marker(p, COM); flush_put_bits(p); ptr = put_bits_ptr(p); put_bits(p, 16, 0); /* patched later */ avpriv_put_string(p, LIBAVCODEC_IDENT, 1); size = strlen(LIBAVCODEC_IDENT)+3; AV_WB16(ptr, size); } if (avctx->pix_fmt == AV_PIX_FMT_YUV420P || avctx->pix_fmt == AV_PIX_FMT_YUV422P || avctx->pix_fmt == AV_PIX_FMT_YUV444P) { put_marker(p, COM); flush_put_bits(p); ptr = put_bits_ptr(p); put_bits(p, 16, 0); /* patched later */ avpriv_put_string(p, "CS=ITU601", 1); size = strlen("CS=ITU601")+3; AV_WB16(ptr, size); } } void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb, ScanTable *intra_scantable, int pred, uint16_t intra_matrix[64]) { int chroma_h_shift, chroma_v_shift; const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG; int hsample[3], vsample[3]; av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift); if (avctx->codec->id == AV_CODEC_ID_LJPEG && avctx->pix_fmt == AV_PIX_FMT_BGR24) { vsample[0] = hsample[0] = vsample[1] = hsample[1] = vsample[2] = hsample[2] = 1; } else { vsample[0] = 2; vsample[1] = 2 >> chroma_v_shift; vsample[2] = 2 >> chroma_v_shift; hsample[0] = 2; hsample[1] = 2 >> chroma_h_shift; hsample[2] = 2 >> chroma_h_shift; } put_marker(pb, SOI); jpeg_put_comments(avctx, pb); jpeg_table_header(pb, intra_scantable, intra_matrix); switch (avctx->codec_id) { case AV_CODEC_ID_MJPEG: put_marker(pb, SOF0 ); break; case AV_CODEC_ID_LJPEG: put_marker(pb, SOF3 ); break; default: assert(0); } put_bits(pb, 16, 17); if (lossless && avctx->pix_fmt == AV_PIX_FMT_BGR24) put_bits(pb, 8, 9); /* 9 bits/component RCT */ else put_bits(pb, 8, 8); /* 8 bits/component */ put_bits(pb, 16, avctx->height); put_bits(pb, 16, avctx->width); put_bits(pb, 8, 3); /* 3 components */ /* Y component */ put_bits(pb, 8, 1); /* component number */ put_bits(pb, 4, hsample[0]); /* H factor */ put_bits(pb, 4, vsample[0]); /* V factor */ put_bits(pb, 8, 0); /* select matrix */ /* Cb component */ put_bits(pb, 8, 2); /* component number */ put_bits(pb, 4, hsample[1]); /* H factor */ put_bits(pb, 4, vsample[1]); /* V factor */ put_bits(pb, 8, 0); /* select matrix */ /* Cr component */ put_bits(pb, 8, 3); /* component number */ put_bits(pb, 4, hsample[2]); /* H factor */ put_bits(pb, 4, vsample[2]); /* V factor */ put_bits(pb, 8, 0); /* select matrix */ /* scan header */ put_marker(pb, SOS); put_bits(pb, 16, 12); /* length */ put_bits(pb, 8, 3); /* 3 components */ /* Y component */ put_bits(pb, 8, 1); /* index */ put_bits(pb, 4, 0); /* DC huffman table index */ put_bits(pb, 4, 0); /* AC huffman table index */ /* Cb component */ put_bits(pb, 8, 2); /* index */ put_bits(pb, 4, 1); /* DC huffman table index */ put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */ /* Cr component */ put_bits(pb, 8, 3); /* index */ put_bits(pb, 4, 1); /* DC huffman table index */ put_bits(pb, 4, lossless ? 0 : 1); /* AC huffman table index */ put_bits(pb, 8, lossless ? pred : 0); /* Ss (not used) */ switch (avctx->codec_id) { case AV_CODEC_ID_MJPEG: put_bits(pb, 8, 63); break; /* Se (not used) */ case AV_CODEC_ID_LJPEG: put_bits(pb, 8, 0); break; /* not used */ default: assert(0); } put_bits(pb, 8, 0); /* Ah/Al (not used) */ } static void escape_FF(PutBitContext *pb, int start) { int size = put_bits_count(pb) - start * 8; int i, ff_count; uint8_t *buf = 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; flush_put_bits(pb); skip_put_bytes(pb, ff_count); for(i=size-1; ff_count; i--){ int v= buf[i]; if(v==0xFF){ 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(PutBitContext *pb, int header_bits) { ff_mjpeg_encode_stuffing(pb); flush_put_bits(pb); assert((header_bits & 7) == 0); escape_FF(pb, header_bits >> 3); put_marker(pb, EOI); } void ff_mjpeg_encode_dc(PutBitContext *pb, int val, uint8_t *huff_size, uint16_t *huff_code) { int mant, nbits; if (val == 0) { put_bits(pb, huff_size[0], huff_code[0]); } else { mant = val; if (val < 0) { val = -val; mant--; } nbits= av_log2_16bit(val) + 1; put_bits(pb, huff_size[nbits], huff_code[nbits]); put_sbits(pb, nbits, mant); } }