/* * MJPEG encoder and decoder * Copyright (c) 2000, 2001 Fabrice Bellard. * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Support for external huffman table and various fixes (AVID workaround) by * Alex Beregszaszi */ //#define DEBUG #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" #ifdef USE_FASTMEMCPY #include "fastmemcpy.h" #endif /* use two quantizer table (one for luminance and one for chrominance) */ /* not yet working */ #undef TWOMATRIXES typedef struct MJpegContext { UINT8 huff_size_dc_luminance[12]; UINT16 huff_code_dc_luminance[12]; UINT8 huff_size_dc_chrominance[12]; UINT16 huff_code_dc_chrominance[12]; UINT8 huff_size_ac_luminance[256]; UINT16 huff_code_ac_luminance[256]; UINT8 huff_size_ac_chrominance[256]; UINT16 huff_code_ac_chrominance[256]; } MJpegContext; /* JPEG marker codes */ typedef enum { /* start of frame */ SOF0 = 0xc0, /* baseline */ SOF1 = 0xc1, /* extended sequential, huffman */ SOF2 = 0xc2, /* progressive, huffman */ SOF3 = 0xc3, /* lossless, huffman */ SOF5 = 0xc5, /* differential sequential, huffman */ SOF6 = 0xc6, /* differential progressive, huffman */ SOF7 = 0xc7, /* differential lossless, huffman */ JPG = 0xc8, /* reserved for JPEG extension */ SOF9 = 0xc9, /* extended sequential, arithmetic */ SOF10 = 0xca, /* progressive, arithmetic */ SOF11 = 0xcb, /* lossless, arithmetic */ SOF13 = 0xcd, /* differential sequential, arithmetic */ SOF14 = 0xce, /* differential progressive, arithmetic */ SOF15 = 0xcf, /* differential lossless, arithmetic */ DHT = 0xc4, /* define huffman tables */ DAC = 0xcc, /* define arithmetic-coding conditioning */ /* restart with modulo 8 count "m" */ RST0 = 0xd0, RST1 = 0xd1, RST2 = 0xd2, RST3 = 0xd3, RST4 = 0xd4, RST5 = 0xd5, RST6 = 0xd6, RST7 = 0xd7, SOI = 0xd8, /* start of image */ EOI = 0xd9, /* end of image */ SOS = 0xda, /* start of scan */ DQT = 0xdb, /* define quantization tables */ DNL = 0xdc, /* define number of lines */ DRI = 0xdd, /* define restart interval */ DHP = 0xde, /* define hierarchical progression */ EXP = 0xdf, /* expand reference components */ APP0 = 0xe0, APP1 = 0xe1, APP2 = 0xe2, APP3 = 0xe3, APP4 = 0xe4, APP5 = 0xe5, APP6 = 0xe6, APP7 = 0xe7, APP8 = 0xe8, APP9 = 0xe9, APP10 = 0xea, APP11 = 0xeb, APP12 = 0xec, APP13 = 0xed, APP14 = 0xee, APP15 = 0xef, JPG0 = 0xf0, JPG1 = 0xf1, JPG2 = 0xf2, JPG3 = 0xf3, JPG4 = 0xf4, JPG5 = 0xf5, JPG6 = 0xf6, JPG7 = 0xf7, JPG8 = 0xf8, JPG9 = 0xf9, JPG10 = 0xfa, JPG11 = 0xfb, JPG12 = 0xfc, JPG13 = 0xfd, COM = 0xfe, /* comment */ TEM = 0x01, /* temporary private use for arithmetic coding */ /* 0x02 -> 0xbf reserved */ } JPEG_MARKER; #if 0 /* These are the sample quantization tables given in JPEG spec section K.1. * The spec says that the values given produce "good" quality, and * when divided by 2, "very good" quality. */ static const unsigned char std_luminance_quant_tbl[64] = { 16, 11, 10, 16, 24, 40, 51, 61, 12, 12, 14, 19, 26, 58, 60, 55, 14, 13, 16, 24, 40, 57, 69, 56, 14, 17, 22, 29, 51, 87, 80, 62, 18, 22, 37, 56, 68, 109, 103, 77, 24, 35, 55, 64, 81, 104, 113, 92, 49, 64, 78, 87, 103, 121, 120, 101, 72, 92, 95, 98, 112, 100, 103, 99 }; static const unsigned char std_chrominance_quant_tbl[64] = { 17, 18, 24, 47, 99, 99, 99, 99, 18, 21, 26, 66, 99, 99, 99, 99, 24, 26, 56, 99, 99, 99, 99, 99, 47, 66, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99 }; #endif /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ /* IMPORTANT: these are only valid for 8-bit data precision! */ static const UINT8 bits_dc_luminance[17] = { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; static const UINT8 val_dc_luminance[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; static const UINT8 bits_dc_chrominance[17] = { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; static const UINT8 val_dc_chrominance[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; static const UINT8 bits_ac_luminance[17] = { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; static const UINT8 val_ac_luminance[] = { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa }; static const UINT8 bits_ac_chrominance[17] = { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; static const UINT8 val_ac_chrominance[] = { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa }; /* isn't this function nicer than the one in the libjpeg ? */ static void build_huffman_codes(UINT8 *huff_size, UINT16 *huff_code, const UINT8 *bits_table, const UINT8 *val_table) { int i, j, k,nb, code, sym; code = 0; k = 0; for(i=1;i<=16;i++) { nb = bits_table[i]; for(j=0;jmin_qcoeff=-1023; s->max_qcoeff= 1023; s->intra_quant_bias= 1<<(QUANT_BIAS_SHIFT-1); //(a + x/2)/x /* build all the huffman tables */ build_huffman_codes(m->huff_size_dc_luminance, m->huff_code_dc_luminance, bits_dc_luminance, val_dc_luminance); build_huffman_codes(m->huff_size_dc_chrominance, m->huff_code_dc_chrominance, bits_dc_chrominance, val_dc_chrominance); build_huffman_codes(m->huff_size_ac_luminance, m->huff_code_ac_luminance, bits_ac_luminance, val_ac_luminance); build_huffman_codes(m->huff_size_ac_chrominance, m->huff_code_ac_chrominance, bits_ac_chrominance, val_ac_chrominance); s->mjpeg_ctx = m; return 0; } void mjpeg_close(MpegEncContext *s) { av_free(s->mjpeg_ctx); } static inline void put_marker(PutBitContext *p, int code) { put_bits(p, 8, 0xff); put_bits(p, 8, code); } /* table_class: 0 = DC coef, 1 = AC coefs */ static int put_huffman_table(MpegEncContext *s, int table_class, int table_id, const UINT8 *bits_table, const UINT8 *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;ipb; int i, j, size; UINT8 *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 = zigzag_direct[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 = zigzag_direct[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, bits_dc_luminance, val_dc_luminance); size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance); size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance); size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance); ptr[0] = size >> 8; ptr[1] = size; } static void jpeg_put_comments(MpegEncContext *s) { PutBitContext *p = &s->pb; int size; UINT8 *ptr; #if 0 /* JFIF header */ put_marker(p, APP0); put_bits(p, 16, 16); put_string(p, "JFIF"); /* this puts the trailing zero-byte too */ put_bits(p, 16, 0x101); put_bits(p, 8, 0); /* units type: 0 - aspect ratio */ put_bits(p, 16, 1); /* aspect: 1:1 */ put_bits(p, 16, 1); put_bits(p, 8, 0); /* thumbnail width */ put_bits(p, 8, 0); /* thumbnail height */ #endif /* comment */ put_marker(p, COM); flush_put_bits(p); ptr = pbBufPtr(p); put_bits(p, 16, 0); /* patched later */ #define VERSION "FFmpeg" LIBAVCODEC_VERSION "b" LIBAVCODEC_BUILD_STR put_string(p, VERSION); size = strlen(VERSION)+3; #undef VERSION ptr[0] = size >> 8; ptr[1] = size; } void mjpeg_picture_header(MpegEncContext *s) { put_marker(&s->pb, SOI); if (!s->mjpeg_data_only_frames) { jpeg_put_comments(s); if (s->mjpeg_write_tables) jpeg_table_header(s); put_marker(&s->pb, SOF0); put_bits(&s->pb, 16, 17); 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, 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, 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, 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, 1); /* AC huffman table index */ put_bits(&s->pb, 8, 0); /* Ss (not used) */ put_bits(&s->pb, 8, 63); /* Se (not used) */ put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */ } void mjpeg_picture_trailer(MpegEncContext *s) { jflush_put_bits(&s->pb); put_marker(&s->pb, EOI); } static inline void mjpeg_encode_dc(MpegEncContext *s, int val, UINT8 *huff_size, UINT16 *huff_code) { int mant, nbits; if (val == 0) { jput_bits(&s->pb, huff_size[0], huff_code[0]); } else { mant = val; if (val < 0) { val = -val; mant--; } /* compute the log (XXX: optimize) */ nbits = 0; while (val != 0) { val = val >> 1; nbits++; } jput_bits(&s->pb, huff_size[nbits], huff_code[nbits]); jput_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 *huff_size_ac; UINT16 *huff_code_ac; /* DC coef */ component = (n <= 3 ? 0 : n - 4 + 1); dc = block[0]; /* overflow is impossible */ val = dc - s->last_dc[component]; if (n < 4) { 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 { 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 = zigzag_direct[i]; val = block[j]; if (val == 0) { run++; } else { while (run >= 16) { jput_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]); run -= 16; } mant = val; if (val < 0) { val = -val; mant--; } /* compute the log (XXX: optimize) */ nbits = 0; while (val != 0) { val = val >> 1; nbits++; } code = (run << 4) | nbits; jput_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]); jput_bits(&s->pb, nbits, mant & ((1 << nbits) - 1)); run = 0; } } /* output EOB only if not already 64 values */ if (last_index < 63 || run != 0) jput_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]); } void mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64]) { int i; for(i=0;i<6;i++) { encode_block(s, block[i], i); } } /******************************************/ /* decoding */ /* compressed picture size */ #define PICTURE_BUFFER_SIZE 100000 #define MAX_COMPONENTS 4 typedef struct MJpegDecodeContext { AVCodecContext *avctx; GetBitContext gb; UINT32 header_state; int start_code; /* current start code */ UINT8 *buf_ptr; int buffer_size; int mpeg_enc_ctx_allocated; /* true if decoding context allocated */ INT16 quant_matrixes[4][64]; VLC vlcs[2][4]; int org_width, org_height; /* size given at codec init */ int first_picture; /* true if decoding first picture */ int interlaced; /* true if interlaced */ int bottom_field; /* true if bottom field */ int width, height; int nb_components; int component_id[MAX_COMPONENTS]; int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */ int v_count[MAX_COMPONENTS]; int h_max, v_max; /* maximum h and v counts */ int quant_index[4]; /* quant table index for each component */ int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */ UINT8 *current_picture[MAX_COMPONENTS]; /* picture structure */ int linesize[MAX_COMPONENTS]; DCTELEM block[64] __align8; UINT8 buffer[PICTURE_BUFFER_SIZE]; int buggy_avid; int restart_interval; int restart_count; int interleaved_rows; } MJpegDecodeContext; #define SKIP_REMAINING(gb, len) { \ dprintf("reamining %d bytes in marker\n", len); \ if (len) while (--len) \ skip_bits(gb, 8); \ } static int mjpeg_decode_dht(MJpegDecodeContext *s, UINT8 *buf, int buf_size); static void build_vlc(VLC *vlc, const UINT8 *bits_table, const UINT8 *val_table, int nb_codes) { UINT8 huff_size[256]; UINT16 huff_code[256]; memset(huff_size, 0, sizeof(huff_size)); build_huffman_codes(huff_size, huff_code, bits_table, val_table); init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2); } static int mjpeg_decode_init(AVCodecContext *avctx) { MJpegDecodeContext *s = avctx->priv_data; s->avctx = avctx; s->header_state = 0; s->mpeg_enc_ctx_allocated = 0; s->buffer_size = PICTURE_BUFFER_SIZE - 1; /* minus 1 to take into account FF 00 case */ s->start_code = -1; s->buf_ptr = s->buffer; s->first_picture = 1; s->org_width = avctx->width; s->org_height = avctx->height; build_vlc(&s->vlcs[0][0], bits_dc_luminance, val_dc_luminance, 12); build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12); build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251); build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251); if (avctx->flags & CODEC_FLAG_EXTERN_HUFF) { printf("mjpeg: using external huffman table\n"); mjpeg_decode_dht(s, avctx->extradata, avctx->extradata_size); /* should check for error - but dunno */ } return 0; } /* quantize tables */ static int mjpeg_decode_dqt(MJpegDecodeContext *s, UINT8 *buf, int buf_size) { int len, index, i, j; init_get_bits(&s->gb, buf, buf_size); len = get_bits(&s->gb, 16) - 2; while (len >= 65) { /* only 8 bit precision handled */ if (get_bits(&s->gb, 4) != 0) { dprintf("dqt: 16bit precision\n"); return -1; } index = get_bits(&s->gb, 4); if (index >= 4) return -1; dprintf("index=%d\n", index); /* read quant table */ for(i=0;i<64;i++) { j = zigzag_direct[i]; s->quant_matrixes[index][j] = get_bits(&s->gb, 8); } len -= 65; } SKIP_REMAINING(&s->gb, len); return 0; } /* decode huffman tables and build VLC decoders */ static int mjpeg_decode_dht(MJpegDecodeContext *s, UINT8 *buf, int buf_size) { int len, index, i, class, n, v, code_max; UINT8 bits_table[17]; UINT8 val_table[256]; init_get_bits(&s->gb, buf, buf_size); len = get_bits(&s->gb, 16); len -= 2; while (len > 0) { if (len < 17) return -1; class = get_bits(&s->gb, 4); if (class >= 2) return -1; index = get_bits(&s->gb, 4); if (index >= 4) return -1; n = 0; for(i=1;i<=16;i++) { bits_table[i] = get_bits(&s->gb, 8); n += bits_table[i]; } len -= 17; if (len < n || n > 256) return -1; code_max = 0; for(i=0;igb, 8); if (v > code_max) code_max = v; val_table[i] = v; } len -= n; /* build VLC and flush previous vlc if present */ free_vlc(&s->vlcs[class][index]); dprintf("class=%d index=%d nb_codes=%d\n", class, index, code_max + 1); build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1); } return 0; } static int mjpeg_decode_sof0(MJpegDecodeContext *s, UINT8 *buf, int buf_size) { int len, nb_components, i, width, height; init_get_bits(&s->gb, buf, buf_size); /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); /* only 8 bits/component accepted */ if (get_bits(&s->gb, 8) != 8) return -1; height = get_bits(&s->gb, 16); width = get_bits(&s->gb, 16); dprintf("sof0: picture: %dx%d\n", width, height); nb_components = get_bits(&s->gb, 8); if (nb_components <= 0 || nb_components > MAX_COMPONENTS) return -1; s->nb_components = nb_components; s->h_max = 1; s->v_max = 1; for(i=0;icomponent_id[i] = get_bits(&s->gb, 8) - 1; s->h_count[i] = get_bits(&s->gb, 4); s->v_count[i] = get_bits(&s->gb, 4); /* compute hmax and vmax (only used in interleaved case) */ if (s->h_count[i] > s->h_max) s->h_max = s->h_count[i]; if (s->v_count[i] > s->v_max) s->v_max = s->v_count[i]; s->quant_index[i] = get_bits(&s->gb, 8); if (s->quant_index[i] >= 4) return -1; dprintf("component %d %d:%d id: %d quant:%d\n", i, s->h_count[i], s->v_count[i], s->component_id[i], s->quant_index[i]); } /* if different size, realloc/alloc picture */ /* XXX: also check h_count and v_count */ if (width != s->width || height != s->height) { for(i=0;icurrent_picture[i]); s->width = width; s->height = height; /* test interlaced mode */ if (s->first_picture && s->org_height != 0 && s->height < ((s->org_height * 3) / 4)) { s->interlaced = 1; s->bottom_field = 0; } for(i=0;iwidth + 8 * s->h_max - 1) / (8 * s->h_max); h = (s->height + 8 * s->v_max - 1) / (8 * s->v_max); w = w * 8 * s->h_count[i]; h = h * 8 * s->v_count[i]; if (s->interlaced) w *= 2; s->linesize[i] = w; /* memory test is done in mjpeg_decode_sos() */ s->current_picture[i] = av_mallocz(w * h); } s->first_picture = 0; } if (len != (8+(3*nb_components))) { dprintf("decode_sof0: error, len(%d) mismatch\n", len); } return 0; } static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index) { int code, diff; code = get_vlc(&s->gb, &s->vlcs[0][dc_index]); if (code < 0) { dprintf("mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index, &s->vlcs[0][dc_index]); return 0xffff; } if (code == 0) { diff = 0; } else { diff = get_bits(&s->gb, code); if ((diff & (1 << (code - 1))) == 0) diff = (-1 << code) | (diff + 1); } return diff; } /* decode block and dequantize */ static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component, int dc_index, int ac_index, int quant_index) { int nbits, code, i, j, level; int run, val; VLC *ac_vlc; INT16 *quant_matrix; /* DC coef */ val = mjpeg_decode_dc(s, dc_index); if (val == 0xffff) { dprintf("error dc\n"); return -1; } quant_matrix = s->quant_matrixes[quant_index]; val = val * quant_matrix[0] + s->last_dc[component]; s->last_dc[component] = val; block[0] = val; /* AC coefs */ ac_vlc = &s->vlcs[1][ac_index]; i = 1; for(;;) { code = get_vlc(&s->gb, ac_vlc); if (code < 0) { dprintf("error ac\n"); return -1; } /* EOB */ if (code == 0) break; if (code == 0xf0) { i += 16; } else { run = code >> 4; nbits = code & 0xf; level = get_bits(&s->gb, nbits); if ((level & (1 << (nbits - 1))) == 0) level = (-1 << nbits) | (level + 1); i += run; if (i >= 64) { dprintf("error count: %d\n", i); return -1; } j = zigzag_direct[i]; block[j] = level * quant_matrix[j]; i++; if (i >= 64) break; } } return 0; } static int mjpeg_decode_sos(MJpegDecodeContext *s, UINT8 *buf, int buf_size) { int len, nb_components, i, j, n, h, v, ret; int mb_width, mb_height, mb_x, mb_y, vmax, hmax, index, id; int comp_index[4]; int dc_index[4]; int ac_index[4]; int nb_blocks[4]; int h_count[4]; int v_count[4]; init_get_bits(&s->gb, buf, buf_size); /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); nb_components = get_bits(&s->gb, 8); /* XXX: only interleaved scan accepted */ if (nb_components != 3) { dprintf("decode_sos: components(%d) mismatch\n", nb_components); return -1; } vmax = 0; hmax = 0; for(i=0;igb, 8) - 1; dprintf("component: %d\n", id); /* find component index */ for(index=0;indexnb_components;index++) if (id == s->component_id[index]) break; if (index == s->nb_components) { dprintf("decode_sos: index(%d) out of components\n", index); return -1; } comp_index[i] = index; nb_blocks[i] = s->h_count[index] * s->v_count[index]; h_count[i] = s->h_count[index]; v_count[i] = s->v_count[index]; dc_index[i] = get_bits(&s->gb, 4); ac_index[i] = get_bits(&s->gb, 4); if (dc_index[i] < 0 || ac_index[i] < 0 || dc_index[i] >= 4 || ac_index[i] >= 4) goto out_of_range; switch(s->start_code) { case SOF0: if (dc_index[i] > 1 || ac_index[i] > 1) goto out_of_range; break; case SOF1: case SOF2: if (dc_index[i] > 3 || ac_index[i] > 3) goto out_of_range; break; case SOF3: if (dc_index[i] > 3 || ac_index[i] != 0) goto out_of_range; break; } } skip_bits(&s->gb, 8); /* Ss */ skip_bits(&s->gb, 8); /* Se */ skip_bits(&s->gb, 8); /* Ah and Al (each are 4 bits) */ for(i=0;ilast_dc[i] = 1024; if (nb_components > 1) { /* interleaved stream */ mb_width = (s->width + s->h_max * 8 - 1) / (s->h_max * 8); mb_height = (s->height + s->v_max * 8 - 1) / (s->v_max * 8); } else { h = s->h_max / s->h_count[comp_index[0]]; v = s->v_max / s->v_count[comp_index[0]]; mb_width = (s->width + h * 8 - 1) / (h * 8); mb_height = (s->height + v * 8 - 1) / (v * 8); nb_blocks[0] = 1; h_count[0] = 1; v_count[0] = 1; } for(mb_y = 0; mb_y < mb_height; mb_y++) { for(mb_x = 0; mb_x < mb_width; mb_x++) { for(i=0;irestart_interval && !s->restart_count) s->restart_count = s->restart_interval; for(j=0;jblock, 0, sizeof(s->block)); if (decode_block(s, s->block, i, dc_index[i], ac_index[i], s->quant_index[c]) < 0) { dprintf("error y=%d x=%d\n", mb_y, mb_x); ret = -1; goto the_end; } // dprintf("mb: %d %d processed\n", mb_y, mb_x); ptr = s->current_picture[c] + (s->linesize[c] * (v * mb_y + y) * 8) + (h * mb_x + x) * 8; if (s->interlaced && s->bottom_field) ptr += s->linesize[c] >> 1; ff_idct_put(ptr, s->linesize[c], s->block); if (++x == h) { x = 0; y++; } } } } } ret = 0; the_end: emms_c(); return ret; out_of_range: dprintf("decode_sos: ac/dc index out of range\n"); return -1; } static int mjpeg_decode_dri(MJpegDecodeContext *s, UINT8 *buf, int buf_size) { init_get_bits(&s->gb, buf, buf_size); if (get_bits(&s->gb, 16) != 4) return -1; s->restart_interval = get_bits(&s->gb, 16); printf("restart interval: %d\n", s->restart_interval); return 0; } #define FOURCC(a,b,c,d) ((a << 24) | (b << 16) | (c << 8) | d) static int mjpeg_decode_app(MJpegDecodeContext *s, UINT8 *buf, int buf_size, int start_code) { int len, id; init_get_bits(&s->gb, buf, buf_size); /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); if (len < 5) return -1; id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16); len -= 6; /* buggy AVID, it puts EOI only at every 10th frame */ /* also this fourcc is used by non-avid files too, it means interleaving, but it's always present in AVID files */ if (id == FOURCC('A','V','I','1')) { /* structure: 4bytes AVI1 1bytes polarity 1bytes always zero 4bytes field_size 4bytes field_size_less_padding */ s->buggy_avid = 1; if (s->first_picture) printf("mjpeg: workarounding buggy AVID\n"); s->interleaved_rows = get_bits(&s->gb, 8); #if 0 skip_bits(&s->gb, 8); skip_bits(&s->gb, 32); skip_bits(&s->gb, 32); len -= 10; #endif if (s->interleaved_rows) printf("mjpeg: interleaved rows: %d\n", s->interleaved_rows); goto out; } len -= 2; if (id == FOURCC('J','F','I','F')) { skip_bits(&s->gb, 8); /* the trailing zero-byte */ printf("mjpeg: JFIF header found (version: %x.%x)\n", get_bits(&s->gb, 8), get_bits(&s->gb, 8)); goto out; } /* Apple MJPEG-A */ if ((start_code == APP1) && (len > (0x28 - 8))) { id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16); len -= 4; if (id == FOURCC('m','j','p','g')) /* Apple MJPEG-A */ { #if 0 skip_bits(&s->gb, 32); /* field size */ skip_bits(&s->gb, 32); /* pad field size */ skip_bits(&s->gb, 32); /* next off */ skip_bits(&s->gb, 32); /* quant off */ skip_bits(&s->gb, 32); /* huff off */ skip_bits(&s->gb, 32); /* image off */ skip_bits(&s->gb, 32); /* scan off */ skip_bits(&s->gb, 32); /* data off */ #endif if (s->first_picture) printf("mjpeg: Apple MJPEG-A header found\n"); } } out: /* should check for further values.. */ SKIP_REMAINING(&s->gb, len); return 0; } #undef FOURCC static int mjpeg_decode_com(MJpegDecodeContext *s, UINT8 *buf, int buf_size) { int len, i; UINT8 *cbuf; init_get_bits(&s->gb, buf, buf_size); /* XXX: verify len field validity */ len = get_bits(&s->gb, 16)-2; cbuf = av_malloc(len+1); for (i = 0; i < len; i++) cbuf[i] = get_bits(&s->gb, 8); if (cbuf[i-1] == '\n') cbuf[i-1] = 0; else cbuf[i] = 0; printf("mjpeg comment: '%s'\n", cbuf); /* buggy avid, it puts EOI only at every 10th frame */ if (!strcmp(cbuf, "AVID")) { s->buggy_avid = 1; if (s->first_picture) printf("mjpeg: workarounding buggy AVID\n"); } av_free(cbuf); return 0; } /* return the 8 bit start code value and update the search state. Return -1 if no start code found */ static int find_marker(UINT8 **pbuf_ptr, UINT8 *buf_end, UINT32 *header_state) { UINT8 *buf_ptr; unsigned int state, v; int val; state = *header_state; buf_ptr = *pbuf_ptr; if (state) { /* get marker */ found: if (buf_ptr < buf_end) { val = *buf_ptr++; state = 0; } else { val = -1; } } else { while (buf_ptr < buf_end) { v = *buf_ptr++; if (v == 0xff) { state = 1; goto found; } } val = -1; } *pbuf_ptr = buf_ptr; *header_state = state; return val; } static int mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size, UINT8 *buf, int buf_size) { MJpegDecodeContext *s = avctx->priv_data; UINT8 *buf_end, *buf_ptr, *buf_start; int len, code, input_size, i; AVPicture *picture = data; unsigned int start_code; *data_size = 0; /* no supplementary picture */ if (buf_size == 0) return 0; buf_ptr = buf; buf_end = buf + buf_size; while (buf_ptr < buf_end) { buf_start = buf_ptr; /* find start next marker */ code = find_marker(&buf_ptr, buf_end, &s->header_state); /* copy to buffer */ len = buf_ptr - buf_start; if (len + (s->buf_ptr - s->buffer) > s->buffer_size) { /* data too big : flush */ s->buf_ptr = s->buffer; if (code > 0) s->start_code = code; } else { memcpy(s->buf_ptr, buf_start, len); s->buf_ptr += len; if (code < 0) { /* nothing to do: wait next marker */ } else if (code == 0 || code == 0xff) { /* if we got FF 00, we copy FF to the stream to unescape FF 00 */ /* valid marker code is between 00 and ff - alex */ s->buf_ptr--; } else { /* prepare data for next start code */ input_size = s->buf_ptr - s->buffer; start_code = s->start_code; s->buf_ptr = s->buffer; s->start_code = code; dprintf("marker=%x\n", start_code); switch(start_code) { case SOI: s->restart_interval = 0; /* nothing to do on SOI */ break; case DQT: mjpeg_decode_dqt(s, s->buffer, input_size); break; case DHT: mjpeg_decode_dht(s, s->buffer, input_size); break; case SOF0: mjpeg_decode_sof0(s, s->buffer, input_size); break; case SOS: mjpeg_decode_sos(s, s->buffer, input_size); if (s->start_code == EOI || s->buggy_avid || s->restart_interval) { int l; if (s->interlaced) { s->bottom_field ^= 1; /* if not bottom field, do not output image yet */ if (s->bottom_field) goto the_end; } for(i=0;i<3;i++) { picture->data[i] = s->current_picture[i]; l = s->linesize[i]; if (s->interlaced) l >>= 1; picture->linesize[i] = l; } *data_size = sizeof(AVPicture); avctx->height = s->height; if (s->interlaced) avctx->height *= 2; avctx->width = s->width; /* XXX: not complete test ! */ switch((s->h_count[0] << 4) | s->v_count[0]) { case 0x11: avctx->pix_fmt = PIX_FMT_YUV444P; break; case 0x21: avctx->pix_fmt = PIX_FMT_YUV422P; break; default: case 0x22: avctx->pix_fmt = PIX_FMT_YUV420P; break; } /* dummy quality */ /* XXX: infer it with matrix */ avctx->quality = 3; goto the_end; } break; case DRI: mjpeg_decode_dri(s, s->buffer, input_size); break; case SOF1: case SOF2: case SOF3: case SOF5: case SOF6: case SOF7: case SOF9: case SOF10: case SOF11: case SOF13: case SOF14: case SOF15: case JPG: printf("mjpeg: unsupported coding type (%x)\n", start_code); return -1; } #if 1 if (start_code >= 0xd0 && start_code <= 0xd7) { dprintf("restart marker: %d\n", start_code&0x0f); } else if (s->first_picture) { /* APP fields */ if (start_code >= 0xe0 && start_code <= 0xef) mjpeg_decode_app(s, s->buffer, input_size, start_code); /* Comment */ else if (start_code == COM) mjpeg_decode_com(s, s->buffer, input_size); } #endif } } } the_end: return buf_ptr - buf; } static int mjpeg_decode_end(AVCodecContext *avctx) { MJpegDecodeContext *s = avctx->priv_data; int i, j; for(i=0;icurrent_picture[i]); for(i=0;i<2;i++) { for(j=0;j<4;j++) free_vlc(&s->vlcs[i][j]); } return 0; } AVCodec mjpeg_decoder = { "mjpeg", CODEC_TYPE_VIDEO, CODEC_ID_MJPEG, sizeof(MJpegDecodeContext), mjpeg_decode_init, NULL, mjpeg_decode_end, mjpeg_decode_frame, 0, NULL };