/* * 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 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 */ /** * @file * MJPEG decoder. */ #include #include "libavutil/imgutils.h" #include "libavutil/opt.h" #include "avcodec.h" #include "blockdsp.h" #include "idctdsp.h" #include "internal.h" #include "jpegtables.h" #include "mjpeg.h" #include "mjpegdec.h" #include "jpeglsdec.h" #include "put_bits.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] = { 0 }; uint16_t huff_code[256]; uint16_t huff_sym[256]; int i; assert(nb_codes <= 256); ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table); for (i = 0; i < 256; i++) huff_sym[i] = i + 16 * is_ac; if (is_ac) huff_sym[0] = 16 * 256; return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, huff_sym, 2, 2, use_static); } static void build_basic_mjpeg_vlc(MJpegDecodeContext *s) { build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance, avpriv_mjpeg_val_dc, 12, 0, 0); build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance, avpriv_mjpeg_val_dc, 12, 0, 0); build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance, avpriv_mjpeg_val_ac_luminance, 251, 0, 1); build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance, avpriv_mjpeg_val_ac_chrominance, 251, 0, 1); build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance, avpriv_mjpeg_val_ac_luminance, 251, 0, 0); build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance, avpriv_mjpeg_val_ac_chrominance, 251, 0, 0); } av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx) { MJpegDecodeContext *s = avctx->priv_data; if (!s->picture_ptr) { s->picture = av_frame_alloc(); if (!s->picture) return AVERROR(ENOMEM); s->picture_ptr = s->picture; } s->avctx = avctx; ff_blockdsp_init(&s->bdsp, avctx); ff_hpeldsp_init(&s->hdsp, avctx->flags); ff_idctdsp_init(&s->idsp, avctx); ff_init_scantable(s->idsp.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; avctx->colorspace = AVCOL_SPC_BT470BG; build_basic_mjpeg_vlc(s); if (s->extern_huff) { int ret; av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n"); init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size * 8); if ((ret = ff_mjpeg_decode_dht(s))) { av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table\n"); return ret; } } if (avctx->field_order == AV_FIELD_BB) { /* 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 == AV_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]; int ret = 0; len = get_bits(&s->gb, 16) - 2; while (len > 0) { if (len < 17) return AVERROR_INVALIDDATA; class = get_bits(&s->gb, 4); if (class >= 2) return AVERROR_INVALIDDATA; index = get_bits(&s->gb, 4); if (index >= 4) return AVERROR_INVALIDDATA; 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 AVERROR_INVALIDDATA; 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 */ ff_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 ((ret = build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0)) < 0) return ret; if (class > 0) { ff_free_vlc(&s->vlcs[2][index]); if ((ret = build_vlc(&s->vlcs[2][index], bits_table, val_table, code_max + 1, 0, 0)) < 0) return ret; } } return 0; } int ff_mjpeg_decode_sof(MJpegDecodeContext *s) { int h_count[MAX_COMPONENTS] = { 0 }; int v_count[MAX_COMPONENTS] = { 0 }; int len, nb_components, i, width, height, bits, pix_fmt_id, ret; /* XXX: verify len field validity */ len = get_bits(&s->gb, 16); bits = get_bits(&s->gb, 8); if (s->pegasus_rct) bits = 9; if (bits == 9 && !s->pegasus_rct) s->rct = 1; // FIXME ugly if (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_image_check_size(width, height, 0, s->avctx)) return AVERROR_INVALIDDATA; nb_components = get_bits(&s->gb, 8); if (nb_components <= 0 || nb_components > MAX_COMPONENTS) return -1; if (s->interlaced && (s->bottom_field == !s->interlace_polarity)) { if (nb_components != s->nb_components) { av_log(s->avctx, AV_LOG_ERROR, "nb_components changing in interlaced picture\n"); return AVERROR_INVALIDDATA; } } if (s->ls && !(bits <= 8 || nb_components == 1)) { avpriv_report_missing_feature(s->avctx, "JPEG-LS that is not <= 8 " "bits/component or 16-bit gray"); return AVERROR_PATCHWELCOME; } 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; h_count[i] = get_bits(&s->gb, 4); v_count[i] = get_bits(&s->gb, 4); /* compute hmax and vmax (only used in interleaved case) */ if (h_count[i] > s->h_max) s->h_max = h_count[i]; if (v_count[i] > s->v_max) s->v_max = v_count[i]; s->quant_index[i] = get_bits(&s->gb, 8); if (s->quant_index[i] >= 4) return AVERROR_INVALIDDATA; if (!h_count[i] || !v_count[i]) { av_log(s->avctx, AV_LOG_ERROR, "Invalid sampling factor in component %d %d:%d\n", i, h_count[i], v_count[i]); return AVERROR_INVALIDDATA; } av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, h_count[i], v_count[i], s->component_id[i], s->quant_index[i]); } if (s->ls && (s->h_max > 1 || s->v_max > 1)) { avpriv_report_missing_feature(s->avctx, "Subsampling in JPEG-LS"); return AVERROR_PATCHWELCOME; } if (s->v_max == 1 && s->h_max == 1 && s->lossless == 1) s->rgb = 1; /* if different size, realloc/alloc picture */ if (width != s->width || height != s->height || bits != s->bits || memcmp(s->h_count, h_count, sizeof(h_count)) || memcmp(s->v_count, v_count, sizeof(v_count))) { s->width = width; s->height = height; s->bits = bits; memcpy(s->h_count, h_count, sizeof(h_count)); memcpy(s->v_count, v_count, sizeof(v_count)); 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_ptr->interlaced_frame = 1; s->picture_ptr->top_field_first = !s->interlace_polarity; height *= 2; } ret = ff_set_dimensions(s->avctx, width, height); if (ret < 0) return ret; s->first_picture = 0; } if (!(s->interlaced && (s->bottom_field == !s->interlace_polarity))) { /* 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 = AV_PIX_FMT_BGRA; else { s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV444P : AV_PIX_FMT_YUVJ444P; s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; } assert(s->nb_components == 3); break; case 0x11000000: s->avctx->pix_fmt = AV_PIX_FMT_GRAY8; break; case 0x12111100: s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV440P : AV_PIX_FMT_YUVJ440P; s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; break; case 0x21111100: s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV422P : AV_PIX_FMT_YUVJ422P; s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; break; case 0x22111100: s->avctx->pix_fmt = s->cs_itu601 ? AV_PIX_FMT_YUV420P : AV_PIX_FMT_YUVJ420P; s->avctx->color_range = s->cs_itu601 ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG; break; default: av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id); return AVERROR_PATCHWELCOME; } if (s->ls) { if (s->nb_components > 1) s->avctx->pix_fmt = AV_PIX_FMT_RGB24; else if (s->bits <= 8) s->avctx->pix_fmt = AV_PIX_FMT_GRAY8; else s->avctx->pix_fmt = AV_PIX_FMT_GRAY16; } s->pix_desc = av_pix_fmt_desc_get(s->avctx->pix_fmt); if (!s->pix_desc) { av_log(s->avctx, AV_LOG_ERROR, "Could not get a pixel format descriptor.\n"); return AVERROR_BUG; } av_frame_unref(s->picture_ptr); if (ff_get_buffer(s->avctx, s->picture_ptr, AV_GET_BUFFER_FLAG_REF) < 0) { av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } s->picture_ptr->pict_type = AV_PICTURE_TYPE_I; s->picture_ptr->key_frame = 1; s->got_picture = 1; for (i = 0; i < 3; i++) s->linesize[i] = s->picture_ptr->linesize[i] << s->interlaced; ff_dlog(s->avctx, "%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, int16_t *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 AVERROR_INVALIDDATA; } 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); do { UPDATE_CACHE(re, &s->gb); GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2); i += ((unsigned)code) >> 4; code &= 0xf; if (code) { 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) { av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i); return AVERROR_INVALIDDATA; } j = s->scantable.permutated[i]; block[j] = level * quant_matrix[j]; } } while (i < 63); CLOSE_READER(re, &s->gb);} return 0; } static int decode_dc_progressive(MJpegDecodeContext *s, int16_t *block, int component, int dc_index, int16_t *quant_matrix, int Al) { int val; s->bdsp.clear_block(block); val = mjpeg_decode_dc(s, dc_index); if (val == 0xffff) { av_log(s->avctx, AV_LOG_ERROR, "error dc\n"); return AVERROR_INVALIDDATA; } 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, int16_t *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[2][ac_index].table, 9, 2); run = ((unsigned) code) >> 4; code &= 0xF; if (code) { i += run; 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 AVERROR_INVALIDDATA; } j = s->scantable.permutated[i]; block[j] = level * quant_matrix[j] << Al; } else { if (run == 0xF) {// ZRL - skip 15 coefficients i += 15; if (i >= se) { av_log(s->avctx, AV_LOG_ERROR, "ZRL overflow: %d\n", i); return AVERROR_INVALIDDATA; } } else { val = (1 << run); if (run) { UPDATE_CACHE(re, &s->gb); val += NEG_USR32(GET_CACHE(re, &s->gb), run); LAST_SKIP_BITS(re, &s->gb, run); } *EOBRUN = val - 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, int16_t *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[2][ac_index].table, 9, 2); 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_ptr->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 nb_components) { int i, mb_x, mb_y; 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; // FIXME optimize this crap ptr = s->picture_ptr->data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); 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; // FIXME optimize this crap ptr = s->picture_ptr->data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); 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, const uint8_t *mb_bitmask, const AVFrame *reference) { int i, mb_x, mb_y; uint8_t *data[MAX_COMPONENTS]; const uint8_t *reference_data[MAX_COMPONENTS]; int linesize[MAX_COMPONENTS]; GetBitContext mb_bitmask_gb; if (mb_bitmask) init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height); for (i = 0; i < nb_components; i++) { int c = s->comp_index[i]; data[c] = s->picture_ptr->data[c]; reference_data[c] = reference ? reference->data[c] : NULL; linesize[c] = s->linesize[c]; s->coefs_finished[c] |= 1; } for (mb_y = 0; mb_y < s->mb_height; mb_y++) { for (mb_x = 0; mb_x < s->mb_width; mb_x++) { const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb); if (s->restart_interval && !s->restart_count) s->restart_count = s->restart_interval; if (get_bits_left(&s->gb) < 0) { av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb)); return AVERROR_INVALIDDATA; } for (i = 0; i < nb_components; i++) { uint8_t *ptr; int n, h, v, x, y, c, j; int block_offset; 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++) { block_offset = ((linesize[c] * (v * mb_y + y) * 8) + (h * mb_x + x) * 8); if (s->interlaced && s->bottom_field) block_offset += linesize[c] >> 1; ptr = data[c] + block_offset; if (!s->progressive) { if (copy_mb) s->hdsp.put_pixels_tab[1][0](ptr, reference_data[c] + block_offset, linesize[c], 8); else { s->bdsp.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 AVERROR_INVALIDDATA; } s->idsp.idct_put(ptr, linesize[c], s->block); } } else { int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x); int16_t *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 AVERROR_INVALIDDATA; } } ff_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x); ff_dlog(s->avctx, "%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--; i = 8 + ((-get_bits_count(&s->gb)) & 7); /* skip RSTn */ if (show_bits(&s->gb, i) == (1 << i) - 1) { int pos = get_bits_count(&s->gb); align_get_bits(&s->gb); while (get_bits_left(&s->gb) >= 8 && show_bits(&s->gb, 8) == 0xFF) skip_bits(&s->gb, 8); if ((get_bits(&s->gb, 8) & 0xF8) == 0xD0) { for (i = 0; i < nb_components; i++) /* reset dc */ s->last_dc[i] = 1024; } else skip_bits_long(&s->gb, pos - get_bits_count(&s->gb)); } } } } return 0; } static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al, const uint8_t *mb_bitmask, const AVFrame *reference) { int mb_x, mb_y; int EOBRUN = 0; int c = s->comp_index[0]; uint8_t *data = s->picture_ptr->data[c]; const uint8_t *reference_data = reference ? reference->data[c] : NULL; int linesize = s->linesize[c]; int last_scan = 0; int16_t *quant_matrix = s->quant_matrixes[s->quant_index[c]]; GetBitContext mb_bitmask_gb; if (ss < 0 || ss >= 64 || se < ss || se >= 64 || Ah < 0 || Al < 0) return AVERROR_INVALIDDATA; if (mb_bitmask) init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height); if (!Al) { // s->coefs_finished is a bitmask for coefficients coded // ss and se are parameters telling start and end coefficients s->coefs_finished[c] |= (~0ULL >> (63 - (se - ss))) << ss; last_scan = !~s->coefs_finished[c]; } if (s->interlaced && s->bottom_field) { int offset = linesize >> 1; data += offset; reference_data += offset; } for (mb_y = 0; mb_y < s->mb_height; mb_y++) { int block_offset = mb_y * linesize * 8; uint8_t *ptr = data + block_offset; int block_idx = mb_y * s->block_stride[c]; int16_t (*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++) { const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb); if (!copy_mb) { 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 AVERROR_INVALIDDATA; } } if (last_scan) { if (copy_mb) { s->hdsp.put_pixels_tab[1][0](ptr, reference_data + block_offset, linesize, 8); } else { s->idsp.idct_put(ptr, linesize, *block); ptr += 8; } } } } return 0; } int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask, const AVFrame *reference) { int len, nb_components, i, h, v, predictor, point_transform; int index, id, ret; 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 AVERROR_PATCHWELCOME; } if (len != 6 + 2 * nb_components) { av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len); return AVERROR_INVALIDDATA; } 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 AVERROR_INVALIDDATA; } /* 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 */ 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); next_field: for (i = 0; i < nb_components; i++) s->last_dc[i] = 1024; if (s->lossless) { if (CONFIG_JPEGLS_DECODER && s->ls) { // for () { // reset_ls_coding_parameters(s, 0); if ((ret = ff_jpegls_decode_picture(s, predictor, point_transform, ilv)) < 0) return ret; } else { if (s->rgb) { if ((ret = ljpeg_decode_rgb_scan(s, predictor, point_transform)) < 0) return ret; } else { if ((ret = ljpeg_decode_yuv_scan(s, predictor, point_transform, nb_components)) < 0) return ret; } } } else { if (s->progressive && predictor) { if ((ret = mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform, mb_bitmask, reference)) < 0) return ret; } else { if ((ret = mjpeg_decode_scan(s, nb_components, prev_shift, point_transform, mb_bitmask, reference)) < 0) return ret; } } if (s->interlaced && get_bits_left(&s->gb) > 32 && show_bits(&s->gb, 8) == 0xFF) { GetBitContext bak = s->gb; align_get_bits(&bak); if (show_bits(&bak, 16) == 0xFFD1) { ff_dlog(s->avctx, "AVRn interlaced picture marker found\n"); s->gb = bak; skip_bits(&s->gb, 16); s->bottom_field ^= 1; goto next_field; } } emms_c(); return 0; out_of_range: av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n"); return AVERROR_INVALIDDATA; } static int mjpeg_decode_dri(MJpegDecodeContext *s) { if (get_bits(&s->gb, 16) != 4) return AVERROR_INVALIDDATA; 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 AVERROR_INVALIDDATA; if (8 * len > get_bits_left(&s->gb)) return AVERROR_INVALIDDATA; 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 information, but it's always present in AVID-created 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; 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 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); ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio); 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; /* Apple MJPEG-A */ if (id == AV_RL32("mjpg")) { #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_left(&s->gb)) { 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; } 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; } /* 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: ff_dlog(NULL, "find_marker skipped %d bytes\n", skipped); *pbuf_ptr = buf_ptr; return val; } int ff_mjpeg_find_marker(MJpegDecodeContext *s, const uint8_t **buf_ptr, const uint8_t *buf_end, const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size) { int start_code; start_code = find_marker(buf_ptr, buf_end); av_fast_padded_malloc(&s->buffer, &s->buffer_size, buf_end - *buf_ptr); if (!s->buffer) return AVERROR(ENOMEM); /* 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 (s->avctx->codec_id != AV_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; } } } *unescaped_buf_ptr = s->buffer; *unescaped_buf_size = dst - s->buffer; memset(s->buffer + *unescaped_buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); av_log(s->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); *unescaped_buf_ptr = dst; *unescaped_buf_size = (bit_count + 7) >> 3; memset(s->buffer + *unescaped_buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); } else { *unescaped_buf_ptr = *buf_ptr; *unescaped_buf_size = buf_end - *buf_ptr; } return start_code; } int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { AVFrame *frame = data; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; MJpegDecodeContext *s = avctx->priv_data; const uint8_t *buf_end, *buf_ptr; const uint8_t *unescaped_buf_ptr; int unescaped_buf_size; int start_code; int ret = 0; 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 = ff_mjpeg_find_marker(s, &buf_ptr, buf_end, &unescaped_buf_ptr, &unescaped_buf_size); /* EOF */ if (start_code < 0) { goto the_end; } else if (unescaped_buf_size > INT_MAX / 8) { av_log(avctx, AV_LOG_ERROR, "MJPEG packet 0x%x too big (%d/%d), corrupt data?\n", start_code, unescaped_buf_size, buf_size); return AVERROR_INVALIDDATA; } av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr); ret = init_get_bits(&s->gb, unescaped_buf_ptr, unescaped_buf_size * 8); if (ret < 0) return ret; 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); if (!CONFIG_JPEGLS_DECODER && (start_code == SOF48 || start_code == LSE)) { av_log(avctx, AV_LOG_ERROR, "JPEG-LS support not enabled.\n"); return AVERROR(ENOSYS); } 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 ((ret = ff_mjpeg_decode_dht(s)) < 0) { av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n"); return ret; } break; case SOF0: case SOF1: s->lossless = 0; s->ls = 0; s->progressive = 0; if ((ret = ff_mjpeg_decode_sof(s)) < 0) return ret; break; case SOF2: s->lossless = 0; s->ls = 0; s->progressive = 1; if ((ret = ff_mjpeg_decode_sof(s)) < 0) return ret; break; case SOF3: s->lossless = 1; s->ls = 0; s->progressive = 0; if ((ret = ff_mjpeg_decode_sof(s)) < 0) return ret; break; case SOF48: s->lossless = 1; s->ls = 1; s->progressive = 0; if ((ret = ff_mjpeg_decode_sof(s)) < 0) return ret; break; case LSE: if (!CONFIG_JPEGLS_DECODER || (ret = ff_jpegls_decode_lse(s)) < 0) return ret; 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; } if ((ret = av_frame_ref(frame, s->picture_ptr)) < 0) return ret; if (s->flipped) { int i; for (i = 0; frame->data[i]; i++) { int h = frame->height >> ((i == 1 || i == 2) ? s->pix_desc->log2_chroma_h : 0); frame->data[i] += frame->linesize[i] * (h - 1); frame->linesize[i] *= -1; } } *got_frame = 1; if (!s->lossless && avctx->debug & FF_DEBUG_QP) { av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2])); } goto the_end; case SOS: if (!s->got_picture) { av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n"); break; } if ((ret = ff_mjpeg_decode_sos(s, NULL, NULL)) < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) return ret; /* 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; } 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 AVERROR_INVALIDDATA; 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) { av_frame_free(&s->picture); s->picture_ptr = NULL; } else if (s->picture_ptr) av_frame_unref(s->picture_ptr); av_free(s->buffer); av_freep(&s->ljpeg_buffer); s->ljpeg_buffer_size = 0; for (i = 0; i < 3; i++) { for (j = 0; j < 4; j++) ff_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; } #define OFFSET(x) offsetof(MJpegDecodeContext, x) #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM static const AVOption options[] = { { "extern_huff", "Use external huffman table.", OFFSET(extern_huff), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD }, { NULL }, }; static const AVClass mjpegdec_class = { .class_name = "MJPEG decoder", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVCodec ff_mjpeg_decoder = { .name = "mjpeg", .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MJPEG, .priv_data_size = sizeof(MJpegDecodeContext), .init = ff_mjpeg_decode_init, .close = ff_mjpeg_decode_end, .decode = ff_mjpeg_decode_frame, .capabilities = AV_CODEC_CAP_DR1, .priv_class = &mjpegdec_class, .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, }; AVCodec ff_thp_decoder = { .name = "thp", .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_THP, .priv_data_size = sizeof(MJpegDecodeContext), .init = ff_mjpeg_decode_init, .close = ff_mjpeg_decode_end, .decode = ff_mjpeg_decode_frame, .capabilities = AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, };