/* * MJPEG decoder * 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 * MJPEG decoder. */ //#define DEBUG #include <assert.h> #include "libavcore/imgutils.h" #include "avcodec.h" #include "dsputil.h" #include "mjpeg.h" #include "mjpegdec.h" #include "jpeglsdec.h" static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, int nb_codes, int use_static, int is_ac) { uint8_t huff_size[256+16]; uint16_t huff_code[256+16]; assert(nb_codes <= 256); memset(huff_size, 0, sizeof(huff_size)); ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table); if(is_ac){ memmove(huff_size+16, huff_size, sizeof(uint8_t)*nb_codes); memmove(huff_code+16, huff_code, sizeof(uint16_t)*nb_codes); memset(huff_size, 0, sizeof(uint8_t)*16); memset(huff_code, 0, sizeof(uint16_t)*16); nb_codes += 16; } return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, use_static); } static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) { build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance, ff_mjpeg_val_dc, 12, 0, 0); build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance, ff_mjpeg_val_dc, 12, 0, 0); build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance, ff_mjpeg_val_ac_luminance, 251, 0, 1); build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance, ff_mjpeg_val_ac_chrominance, 251, 0, 1); } av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx) { MJpegDecodeContext *s = avctx->priv_data; s->avctx = avctx; dsputil_init(&s->dsp, avctx); ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct); s->buffer_size = 0; s->buffer = NULL; s->start_code = -1; s->first_picture = 1; s->org_height = avctx->coded_height; avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; build_basic_mjpeg_vlc(s); if (avctx->flags & CODEC_FLAG_EXTERN_HUFF) { av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n"); init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8); if (ff_mjpeg_decode_dht(s)) { av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n"); build_basic_mjpeg_vlc(s); } } if (avctx->extradata_size > 9 && AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) { if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */ s->interlace_polarity = 1; /* bottom field first */ av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n"); } } if (avctx->codec->id == CODEC_ID_AMV) s->flipped = 1; return 0; } /* quantize tables */ int ff_mjpeg_decode_dqt(MJpegDecodeContext *s) { int len, index, i, j; len = get_bits(&s->gb, 16) - 2; while (len >= 65) { /* only 8 bit precision handled */ if (get_bits(&s->gb, 4) != 0) { av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n"); return -1; } index = get_bits(&s->gb, 4); if (index >= 4) return -1; av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index); /* read quant table */ for(i=0;i<64;i++) { j = s->scantable.permutated[i]; s->quant_matrixes[index][j] = get_bits(&s->gb, 8); } //XXX FIXME finetune, and perhaps add dc too s->qscale[index]= FFMAX( s->quant_matrixes[index][s->scantable.permutated[1]], s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1; av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]); len -= 65; } return 0; } /* decode huffman tables and build VLC decoders */ int ff_mjpeg_decode_dht(MJpegDecodeContext *s) { int len, index, i, class, n, v, code_max; uint8_t bits_table[17]; uint8_t val_table[256]; len = get_bits(&s->gb, 16) - 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;i<n;i++) { v = get_bits(&s->gb, 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]); av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n", class, index, code_max + 1); if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){ return -1; } } return 0; } int ff_mjpeg_decode_sof(MJpegDecodeContext *s) { int len, nb_components, i, width, height, pix_fmt_id; /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); s->bits= get_bits(&s->gb, 8); if(s->pegasus_rct) s->bits=9; if(s->bits==9 && !s->pegasus_rct) s->rct=1; //FIXME ugly if (s->bits != 8 && !s->lossless){ av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n"); return -1; } height = get_bits(&s->gb, 16); width = get_bits(&s->gb, 16); //HACK for odd_height.mov if(s->interlaced && s->width == width && s->height == height + 1) height= s->height; av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height); if(av_check_image_size(width, height, 0, s->avctx)) return -1; nb_components = get_bits(&s->gb, 8); if (nb_components <= 0 || nb_components > MAX_COMPONENTS) return -1; if (s->ls && !(s->bits <= 8 || nb_components == 1)){ av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n"); return -1; } s->nb_components = nb_components; s->h_max = 1; s->v_max = 1; for(i=0;i<nb_components;i++) { /* component id */ s->component_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; av_log(s->avctx, AV_LOG_DEBUG, "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(s->ls && (s->h_max > 1 || s->v_max > 1)) { av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n"); return -1; } if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1; /* if different size, realloc/alloc picture */ /* XXX: also check h_count and v_count */ if (width != s->width || height != s->height) { av_freep(&s->qscale_table); s->width = width; s->height = height; s->interlaced = 0; /* test interlaced mode */ if (s->first_picture && s->org_height != 0 && s->height < ((s->org_height * 3) / 4)) { s->interlaced = 1; s->bottom_field = s->interlace_polarity; s->picture.interlaced_frame = 1; s->picture.top_field_first = !s->interlace_polarity; height *= 2; } avcodec_set_dimensions(s->avctx, width, height); s->qscale_table= av_mallocz((s->width+15)/16); s->first_picture = 0; } if(s->interlaced && (s->bottom_field == !s->interlace_polarity)) return 0; /* XXX: not complete test ! */ pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) | (s->h_count[1] << 20) | (s->v_count[1] << 16) | (s->h_count[2] << 12) | (s->v_count[2] << 8) | (s->h_count[3] << 4) | s->v_count[3]; av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id); //NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4 if(!(pix_fmt_id & 0xD0D0D0D0)) pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1; if(!(pix_fmt_id & 0x0D0D0D0D)) pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1; switch(pix_fmt_id){ case 0x11111100: if(s->rgb){ s->avctx->pix_fmt = PIX_FMT_BGRA; }else s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P; assert(s->nb_components==3); break; case 0x11000000: s->avctx->pix_fmt = PIX_FMT_GRAY8; break; case 0x12111100: s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P; break; case 0x21111100: s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P; break; case 0x22111100: s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P; break; default: av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id); return -1; } if(s->ls){ if(s->nb_components > 1) s->avctx->pix_fmt = PIX_FMT_RGB24; else if(s->bits <= 8) s->avctx->pix_fmt = PIX_FMT_GRAY8; else s->avctx->pix_fmt = PIX_FMT_GRAY16; } if(s->picture.data[0]) s->avctx->release_buffer(s->avctx, &s->picture); s->picture.reference= 0; if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){ av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } s->picture.pict_type= FF_I_TYPE; s->picture.key_frame= 1; s->got_picture = 1; for(i=0; i<3; i++){ s->linesize[i]= s->picture.linesize[i] << s->interlaced; } // printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height); if (len != (8+(3*nb_components))) { av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len); } /* totally blank picture as progressive JPEG will only add details to it */ if(s->progressive){ int bw = (width + s->h_max*8-1) / (s->h_max*8); int bh = (height + s->v_max*8-1) / (s->v_max*8); for(i=0; i<s->nb_components; i++) { int size = bw * bh * s->h_count[i] * s->v_count[i]; av_freep(&s->blocks[i]); av_freep(&s->last_nnz[i]); s->blocks[i] = av_malloc(size * sizeof(**s->blocks)); s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz)); s->block_stride[i] = bw * s->h_count[i]; } memset(s->coefs_finished, 0, sizeof(s->coefs_finished)); } return 0; } static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index) { int code; code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2); if (code < 0) { av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index, &s->vlcs[0][dc_index]); return 0xffff; } if(code) return get_xbits(&s->gb, code); else return 0; } /* decode block and dequantize */ static int decode_block(MJpegDecodeContext *s, DCTELEM *block, int component, int dc_index, int ac_index, int16_t *quant_matrix) { int code, i, j, level, val; /* DC coef */ val = mjpeg_decode_dc(s, dc_index); if (val == 0xffff) { av_log(s->avctx, AV_LOG_ERROR, "error dc\n"); return -1; } val = val * quant_matrix[0] + s->last_dc[component]; s->last_dc[component] = val; block[0] = val; /* AC coefs */ i = 0; {OPEN_READER(re, &s->gb) for(;;) { UPDATE_CACHE(re, &s->gb); GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2) /* EOB */ if (code == 0x10) break; i += ((unsigned)code) >> 4; if(code != 0x100){ code &= 0xf; if(code > MIN_CACHE_BITS - 16){ UPDATE_CACHE(re, &s->gb) } { int cache=GET_CACHE(re,&s->gb); int sign=(~cache)>>31; level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign; } LAST_SKIP_BITS(re, &s->gb, code) if (i >= 63) { if(i == 63){ j = s->scantable.permutated[63]; block[j] = level * quant_matrix[j]; break; } av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); return -1; } j = s->scantable.permutated[i]; block[j] = level * quant_matrix[j]; } } CLOSE_READER(re, &s->gb)} return 0; } static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component, int dc_index, int16_t *quant_matrix, int Al) { int val; s->dsp.clear_block(block); val = mjpeg_decode_dc(s, dc_index); if (val == 0xffff) { av_log(s->avctx, AV_LOG_ERROR, "error dc\n"); return -1; } val = (val * quant_matrix[0] << Al) + s->last_dc[component]; s->last_dc[component] = val; block[0] = val; return 0; } /* decode block and dequantize - progressive JPEG version */ static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz, int ac_index, int16_t *quant_matrix, int ss, int se, int Al, int *EOBRUN) { int code, i, j, level, val, run; if(*EOBRUN){ (*EOBRUN)--; return 0; } {OPEN_READER(re, &s->gb) for(i=ss;;i++) { UPDATE_CACHE(re, &s->gb); GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2) /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */ code -= 16; if(code & 0xF) { i += ((unsigned) code) >> 4; code &= 0xf; if(code > MIN_CACHE_BITS - 16){ UPDATE_CACHE(re, &s->gb) } { int cache=GET_CACHE(re,&s->gb); int sign=(~cache)>>31; level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign; } LAST_SKIP_BITS(re, &s->gb, code) if (i >= se) { if(i == se){ j = s->scantable.permutated[se]; block[j] = level * quant_matrix[j] << Al; break; } av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); return -1; } j = s->scantable.permutated[i]; block[j] = level * quant_matrix[j] << Al; }else{ run = ((unsigned) code) >> 4; if(run == 0xF){// ZRL - skip 15 coefficients i += 15; }else{ val = run; run = (1 << run); UPDATE_CACHE(re, &s->gb); run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1); if(val) LAST_SKIP_BITS(re, &s->gb, val); *EOBRUN = run - 1; break; } } } CLOSE_READER(re, &s->gb)} if(i > *last_nnz) *last_nnz = i; return 0; } #define REFINE_BIT(j) {\ UPDATE_CACHE(re, &s->gb);\ sign = block[j]>>15;\ block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\ LAST_SKIP_BITS(re, &s->gb, 1);\ } #define ZERO_RUN \ for(;;i++) {\ if(i > last) {\ i += run;\ if(i > se) {\ av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\ return -1;\ }\ break;\ }\ j = s->scantable.permutated[i];\ if(block[j])\ REFINE_BIT(j)\ else if(run-- == 0)\ break;\ } /* decode block and dequantize - progressive JPEG refinement pass */ static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz, int ac_index, int16_t *quant_matrix, int ss, int se, int Al, int *EOBRUN) { int code, i=ss, j, sign, val, run; int last = FFMIN(se, *last_nnz); OPEN_READER(re, &s->gb); if(*EOBRUN) (*EOBRUN)--; else { for(;;i++) { UPDATE_CACHE(re, &s->gb); GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2) /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */ code -= 16; if(code & 0xF) { run = ((unsigned) code) >> 4; UPDATE_CACHE(re, &s->gb); val = SHOW_UBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); ZERO_RUN; j = s->scantable.permutated[i]; val--; block[j] = ((quant_matrix[j]^val)-val) << Al; if(i == se) { if(i > *last_nnz) *last_nnz = i; CLOSE_READER(re, &s->gb) return 0; } }else{ run = ((unsigned) code) >> 4; if(run == 0xF){ ZERO_RUN; }else{ val = run; run = (1 << run); if(val) { UPDATE_CACHE(re, &s->gb); run += SHOW_UBITS(re, &s->gb, val); LAST_SKIP_BITS(re, &s->gb, val); } *EOBRUN = run - 1; break; } } } if(i > *last_nnz) *last_nnz = i; } for(;i<=last;i++) { j = s->scantable.permutated[i]; if(block[j]) REFINE_BIT(j) } CLOSE_READER(re, &s->gb); return 0; } #undef REFINE_BIT #undef ZERO_RUN static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){ int i, mb_x, mb_y; uint16_t (*buffer)[4]; int left[3], top[3], topleft[3]; const int linesize= s->linesize[0]; const int mask= (1<<s->bits)-1; av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0])); buffer= s->ljpeg_buffer; for(i=0; i<3; i++){ buffer[0][i]= 1 << (s->bits + point_transform - 1); } for(mb_y = 0; mb_y < s->mb_height; mb_y++) { const int modified_predictor= mb_y ? predictor : 1; uint8_t *ptr = s->picture.data[0] + (linesize * mb_y); if (s->interlaced && s->bottom_field) ptr += linesize >> 1; for(i=0; i<3; i++){ top[i]= left[i]= topleft[i]= buffer[0][i]; } for(mb_x = 0; mb_x < s->mb_width; mb_x++) { if (s->restart_interval && !s->restart_count) s->restart_count = s->restart_interval; for(i=0;i<3;i++) { int pred; topleft[i]= top[i]; top[i]= buffer[mb_x][i]; PREDICT(pred, topleft[i], top[i], left[i], modified_predictor); left[i]= buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform)); } if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ } } if(s->rct){ for(mb_x = 0; mb_x < s->mb_width; mb_x++) { ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2); ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1]; ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1]; } }else if(s->pegasus_rct){ for(mb_x = 0; mb_x < s->mb_width; mb_x++) { ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2); ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1]; ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1]; } }else{ for(mb_x = 0; mb_x < s->mb_width; mb_x++) { ptr[4*mb_x+0] = buffer[mb_x][2]; ptr[4*mb_x+1] = buffer[mb_x][1]; ptr[4*mb_x+2] = buffer[mb_x][0]; } } } return 0; } static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){ int i, mb_x, mb_y; const int nb_components=3; for(mb_y = 0; mb_y < s->mb_height; mb_y++) { for(mb_x = 0; mb_x < s->mb_width; mb_x++) { if (s->restart_interval && !s->restart_count) s->restart_count = s->restart_interval; if(mb_x==0 || mb_y==0 || s->interlaced){ for(i=0;i<nb_components;i++) { uint8_t *ptr; int n, h, v, x, y, c, j, linesize; n = s->nb_blocks[i]; c = s->comp_index[i]; h = s->h_scount[i]; v = s->v_scount[i]; x = 0; y = 0; linesize= s->linesize[c]; for(j=0; j<n; j++) { int pred; ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap if(y==0 && mb_y==0){ if(x==0 && mb_x==0){ pred= 128 << point_transform; }else{ pred= ptr[-1]; } }else{ if(x==0 && mb_x==0){ pred= ptr[-linesize]; }else{ PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor); } } if (s->interlaced && s->bottom_field) ptr += linesize >> 1; *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform); if (++x == h) { x = 0; y++; } } } }else{ for(i=0;i<nb_components;i++) { uint8_t *ptr; int n, h, v, x, y, c, j, linesize; n = s->nb_blocks[i]; c = s->comp_index[i]; h = s->h_scount[i]; v = s->v_scount[i]; x = 0; y = 0; linesize= s->linesize[c]; for(j=0; j<n; j++) { int pred; ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor); *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform); if (++x == h) { x = 0; y++; } } } } if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ } } } return 0; } static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al){ int i, mb_x, mb_y; uint8_t* data[MAX_COMPONENTS]; int linesize[MAX_COMPONENTS]; if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) { av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n"); s->flipped = 0; } for(i=0; i < nb_components; i++) { int c = s->comp_index[i]; data[c] = s->picture.data[c]; linesize[c]=s->linesize[c]; s->coefs_finished[c] |= 1; if(s->flipped) { //picture should be flipped upside-down for this codec data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 )); linesize[c] *= -1; } } for(mb_y = 0; mb_y < s->mb_height; mb_y++) { for(mb_x = 0; mb_x < s->mb_width; mb_x++) { if (s->restart_interval && !s->restart_count) s->restart_count = s->restart_interval; for(i=0;i<nb_components;i++) { uint8_t *ptr; int n, h, v, x, y, c, j; n = s->nb_blocks[i]; c = s->comp_index[i]; h = s->h_scount[i]; v = s->v_scount[i]; x = 0; y = 0; for(j=0;j<n;j++) { ptr = data[c] + (((linesize[c] * (v * mb_y + y) * 8) + (h * mb_x + x) * 8) >> s->avctx->lowres); if(s->interlaced && s->bottom_field) ptr += linesize[c] >> 1; if(!s->progressive) { s->dsp.clear_block(s->block); if(decode_block(s, s->block, i, s->dc_index[i], s->ac_index[i], s->quant_matrixes[ s->quant_index[c] ]) < 0) { av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x); return -1; } s->dsp.idct_put(ptr, linesize[c], s->block); } else { int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x); DCTELEM *block = s->blocks[c][block_idx]; if(Ah) block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al; else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) { av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x); return -1; } } // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x); //av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8); if (++x == h) { x = 0; y++; } } } if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ for (i=0; i<nb_components; i++) /* reset dc */ s->last_dc[i] = 1024; } } } return 0; } static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){ int mb_x, mb_y; int EOBRUN = 0; int c = s->comp_index[0]; uint8_t* data = s->picture.data[c]; int linesize = s->linesize[c]; int last_scan = 0; int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ]; if(!Al) { s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss); last_scan = !~s->coefs_finished[c]; } if(s->interlaced && s->bottom_field) data += linesize >> 1; for(mb_y = 0; mb_y < s->mb_height; mb_y++) { uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres); int block_idx = mb_y * s->block_stride[c]; DCTELEM (*block)[64] = &s->blocks[c][block_idx]; uint8_t *last_nnz = &s->last_nnz[c][block_idx]; for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) { int ret; if(Ah) ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0], quant_matrix, ss, se, Al, &EOBRUN); else ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0], quant_matrix, ss, se, Al, &EOBRUN); if(ret < 0) { av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x); return -1; } if(last_scan) { s->dsp.idct_put(ptr, linesize, *block); ptr += 8 >> s->avctx->lowres; } } } return 0; } int ff_mjpeg_decode_sos(MJpegDecodeContext *s) { int len, nb_components, i, h, v, predictor, point_transform; int index, id; const int block_size= s->lossless ? 1 : 8; int ilv, prev_shift; /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); nb_components = get_bits(&s->gb, 8); if (nb_components == 0 || nb_components > MAX_COMPONENTS){ av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components); return -1; } if (len != 6+2*nb_components) { av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len); return -1; } for(i=0;i<nb_components;i++) { id = get_bits(&s->gb, 8) - 1; av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id); /* find component index */ for(index=0;index<s->nb_components;index++) if (id == s->component_id[index]) break; if (index == s->nb_components) { av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index); return -1; } /* Metasoft MJPEG codec has Cb and Cr swapped */ if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J') && nb_components == 3 && s->nb_components == 3 && i) index = 3 - i; s->comp_index[i] = index; s->nb_blocks[i] = s->h_count[index] * s->v_count[index]; s->h_scount[i] = s->h_count[index]; s->v_scount[i] = s->v_count[index]; s->dc_index[i] = get_bits(&s->gb, 4); s->ac_index[i] = get_bits(&s->gb, 4); if (s->dc_index[i] < 0 || s->ac_index[i] < 0 || s->dc_index[i] >= 4 || s->ac_index[i] >= 4) goto out_of_range; if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table) goto out_of_range; } predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */ ilv= get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */ prev_shift = get_bits(&s->gb, 4); /* Ah */ point_transform= get_bits(&s->gb, 4); /* Al */ for(i=0;i<nb_components;i++) s->last_dc[i] = 1024; if (nb_components > 1) { /* interleaved stream */ s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size); s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size); } else if(!s->ls) { /* skip this for JPEG-LS */ h = s->h_max / s->h_scount[0]; v = s->v_max / s->v_scount[0]; s->mb_width = (s->width + h * block_size - 1) / (h * block_size); s->mb_height = (s->height + v * block_size - 1) / (v * block_size); s->nb_blocks[0] = 1; s->h_scount[0] = 1; s->v_scount[0] = 1; } if(s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "", predictor, point_transform, ilv, s->bits, s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : "")); /* mjpeg-b can have padding bytes between sos and image data, skip them */ for (i = s->mjpb_skiptosod; i > 0; i--) skip_bits(&s->gb, 8); if(s->lossless){ if(CONFIG_JPEGLS_DECODER && s->ls){ // for(){ // reset_ls_coding_parameters(s, 0); if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0) return -1; }else{ if(s->rgb){ if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0) return -1; }else{ if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0) return -1; } } }else{ if(s->progressive && predictor) { if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0) return -1; } else { if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform) < 0) return -1; } } emms_c(); return 0; out_of_range: av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n"); return -1; } static int mjpeg_decode_dri(MJpegDecodeContext *s) { if (get_bits(&s->gb, 16) != 4) return -1; s->restart_interval = get_bits(&s->gb, 16); s->restart_count = 0; av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval); return 0; } static int mjpeg_decode_app(MJpegDecodeContext *s) { int len, id, i; len = get_bits(&s->gb, 16); if (len < 5) return -1; if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits) return -1; id = get_bits_long(&s->gb, 32); id = av_be2ne32(id); len -= 6; if(s->avctx->debug & FF_DEBUG_STARTCODE){ av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id); } /* buggy AVID, it puts EOI only at every 10th frame */ /* also this fourcc is used by non-avid files too, it holds some informations, but it's always present in AVID creates files */ if (id == AV_RL32("AVI1")) { /* 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"); i = get_bits(&s->gb, 8); if (i==2) s->bottom_field= 1; else if(i==1) s->bottom_field= 0; #if 0 skip_bits(&s->gb, 8); skip_bits(&s->gb, 32); skip_bits(&s->gb, 32); len -= 10; #endif // if (s->interlace_polarity) // printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity); goto out; } // len -= 2; if (id == AV_RL32("JFIF")) { int t_w, t_h, v1, v2; skip_bits(&s->gb, 8); /* the trailing zero-byte */ v1= get_bits(&s->gb, 8); v2= get_bits(&s->gb, 8); skip_bits(&s->gb, 8); s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16); s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16); if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n", v1, v2, s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den ); t_w = get_bits(&s->gb, 8); t_h = get_bits(&s->gb, 8); if (t_w && t_h) { /* skip thumbnail */ if (len-10-(t_w*t_h*3) > 0) len -= t_w*t_h*3; } len -= 10; goto out; } if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e')) { if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n"); skip_bits(&s->gb, 16); /* version */ skip_bits(&s->gb, 16); /* flags0 */ skip_bits(&s->gb, 16); /* flags1 */ skip_bits(&s->gb, 8); /* transform */ len -= 7; goto out; } if (id == AV_RL32("LJIF")){ if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n"); skip_bits(&s->gb, 16); /* version ? */ skip_bits(&s->gb, 16); /* unknwon always 0? */ skip_bits(&s->gb, 16); /* unknwon always 0? */ skip_bits(&s->gb, 16); /* unknwon always 0? */ switch( get_bits(&s->gb, 8)){ case 1: s->rgb= 1; s->pegasus_rct=0; break; case 2: s->rgb= 1; s->pegasus_rct=1; break; default: av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n"); } len -= 9; goto out; } /* Apple MJPEG-A */ if ((s->start_code == APP1) && (len > (0x28 - 8))) { id = get_bits_long(&s->gb, 32); id = av_be2ne32(id); len -= 4; if (id == AV_RL32("mjpg")) /* 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->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n"); } } out: /* slow but needed for extreme adobe jpegs */ if (len < 0) av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n"); while(--len > 0) skip_bits(&s->gb, 8); return 0; } static int mjpeg_decode_com(MJpegDecodeContext *s) { int len = get_bits(&s->gb, 16); if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) { char *cbuf = av_malloc(len - 1); if (cbuf) { int i; for (i = 0; i < len - 2; i++) cbuf[i] = get_bits(&s->gb, 8); if (i > 0 && cbuf[i-1] == '\n') cbuf[i-1] = 0; else cbuf[i] = 0; if(s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_INFO, "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"); } else if(!strcmp(cbuf, "CS=ITU601")){ s->cs_itu601= 1; } else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) || (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){ s->flipped = 1; } av_free(cbuf); } } return 0; } #if 0 static int valid_marker_list[] = { /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */ /* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 2 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 3 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* a */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* b */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* c */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* d */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* e */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* f */ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, } #endif /* return the 8 bit start code value and update the search state. Return -1 if no start code found */ static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end) { const uint8_t *buf_ptr; unsigned int v, v2; int val; #ifdef DEBUG int skipped=0; #endif buf_ptr = *pbuf_ptr; while (buf_ptr < buf_end) { v = *buf_ptr++; v2 = *buf_ptr; if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) { val = *buf_ptr++; goto found; } #ifdef DEBUG skipped++; #endif } val = -1; found: dprintf(NULL, "find_marker skipped %d bytes\n", skipped); *pbuf_ptr = buf_ptr; return val; } int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; MJpegDecodeContext *s = avctx->priv_data; const uint8_t *buf_end, *buf_ptr; int start_code; AVFrame *picture = data; s->got_picture = 0; // picture from previous image can not be reused buf_ptr = buf; buf_end = buf + buf_size; while (buf_ptr < buf_end) { /* find start next marker */ start_code = find_marker(&buf_ptr, buf_end); { /* EOF */ if (start_code < 0) { goto the_end; } else { av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr); if ((buf_end - buf_ptr) > s->buffer_size) { av_free(s->buffer); s->buffer_size = buf_end-buf_ptr; s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE); av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n", s->buffer_size); } /* unescape buffer of SOS, use special treatment for JPEG-LS */ if (start_code == SOS && !s->ls) { const uint8_t *src = buf_ptr; uint8_t *dst = s->buffer; while (src<buf_end) { uint8_t x = *(src++); *(dst++) = x; if (avctx->codec_id != CODEC_ID_THP) { if (x == 0xff) { while (src < buf_end && x == 0xff) x = *(src++); if (x >= 0xd0 && x <= 0xd7) *(dst++) = x; else if (x) break; } } } init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8); av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n", (buf_end - buf_ptr) - (dst - s->buffer)); } else if(start_code == SOS && s->ls){ const uint8_t *src = buf_ptr; uint8_t *dst = s->buffer; int bit_count = 0; int t = 0, b = 0; PutBitContext pb; s->cur_scan++; /* find marker */ while (src + t < buf_end){ uint8_t x = src[t++]; if (x == 0xff){ while((src + t < buf_end) && x == 0xff) x = src[t++]; if (x & 0x80) { t -= 2; break; } } } bit_count = t * 8; init_put_bits(&pb, dst, t); /* unescape bitstream */ while(b < t){ uint8_t x = src[b++]; put_bits(&pb, 8, x); if(x == 0xFF){ x = src[b++]; put_bits(&pb, 7, x); bit_count--; } } flush_put_bits(&pb); init_get_bits(&s->gb, dst, bit_count); } else init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8); s->start_code = start_code; if(s->avctx->debug & FF_DEBUG_STARTCODE){ av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code); } /* process markers */ if (start_code >= 0xd0 && start_code <= 0xd7) { av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f); /* APP fields */ } else if (start_code >= APP0 && start_code <= APP15) { mjpeg_decode_app(s); /* Comment */ } else if (start_code == COM){ mjpeg_decode_com(s); } switch(start_code) { case SOI: s->restart_interval = 0; s->restart_count = 0; /* nothing to do on SOI */ break; case DQT: ff_mjpeg_decode_dqt(s); break; case DHT: if(ff_mjpeg_decode_dht(s) < 0){ av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n"); return -1; } break; case SOF0: case SOF1: s->lossless=0; s->ls=0; s->progressive=0; if (ff_mjpeg_decode_sof(s) < 0) return -1; break; case SOF2: s->lossless=0; s->ls=0; s->progressive=1; if (ff_mjpeg_decode_sof(s) < 0) return -1; break; case SOF3: s->lossless=1; s->ls=0; s->progressive=0; if (ff_mjpeg_decode_sof(s) < 0) return -1; break; case SOF48: s->lossless=1; s->ls=1; s->progressive=0; if (ff_mjpeg_decode_sof(s) < 0) return -1; break; case LSE: if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0) return -1; break; case EOI: s->cur_scan = 0; if ((s->buggy_avid && !s->interlaced) || s->restart_interval) break; eoi_parser: if (!s->got_picture) { av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n"); break; } { if (s->interlaced) { s->bottom_field ^= 1; /* if not bottom field, do not output image yet */ if (s->bottom_field == !s->interlace_polarity) goto not_the_end; } *picture = s->picture; *data_size = sizeof(AVFrame); if(!s->lossless){ picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]); picture->qstride= 0; picture->qscale_table= s->qscale_table; memset(picture->qscale_table, picture->quality, (s->width+15)/16); if(avctx->debug & FF_DEBUG_QP) av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality); picture->quality*= FF_QP2LAMBDA; } goto the_end; } break; case SOS: if (!s->got_picture) { av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n"); break; } ff_mjpeg_decode_sos(s); /* buggy avid puts EOI every 10-20th frame */ /* if restart period is over process EOI */ if ((s->buggy_avid && !s->interlaced) || s->restart_interval) goto eoi_parser; break; case DRI: mjpeg_decode_dri(s); break; case SOF5: case SOF6: case SOF7: case SOF9: case SOF10: case SOF11: case SOF13: case SOF14: case SOF15: case JPG: av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code); break; // default: // printf("mjpeg: unsupported marker (%x)\n", start_code); // break; } not_the_end: /* eof process start code */ buf_ptr += (get_bits_count(&s->gb)+7)/8; av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n", (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb)); } } } if (s->got_picture) { av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n"); goto eoi_parser; } av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n"); return -1; the_end: av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr); // return buf_end - buf_ptr; return buf_ptr - buf; } av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx) { MJpegDecodeContext *s = avctx->priv_data; int i, j; if (s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); av_free(s->buffer); av_free(s->qscale_table); av_freep(&s->ljpeg_buffer); s->ljpeg_buffer_size=0; for(i=0;i<2;i++) { for(j=0;j<4;j++) free_vlc(&s->vlcs[i][j]); } for(i=0; i<MAX_COMPONENTS; i++) { av_freep(&s->blocks[i]); av_freep(&s->last_nnz[i]); } return 0; } AVCodec mjpeg_decoder = { "mjpeg", AVMEDIA_TYPE_VIDEO, CODEC_ID_MJPEG, sizeof(MJpegDecodeContext), ff_mjpeg_decode_init, NULL, ff_mjpeg_decode_end, ff_mjpeg_decode_frame, CODEC_CAP_DR1, NULL, .max_lowres = 8, .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"), }; AVCodec thp_decoder = { "thp", AVMEDIA_TYPE_VIDEO, CODEC_ID_THP, sizeof(MJpegDecodeContext), ff_mjpeg_decode_init, NULL, ff_mjpeg_decode_end, ff_mjpeg_decode_frame, CODEC_CAP_DR1, NULL, .max_lowres = 3, .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"), };