/* * LOCO codec * Copyright (c) 2005 Konstantin Shishkov * * 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 * LOCO codec. */ #include "avcodec.h" #include "get_bits.h" #include "golomb.h" #include "internal.h" #include "mathops.h" enum LOCO_MODE { LOCO_UNKN = 0, LOCO_CYUY2 = -1, LOCO_CRGB = -2, LOCO_CRGBA = -3, LOCO_CYV12 = -4, LOCO_YUY2 = 1, LOCO_UYVY = 2, LOCO_RGB = 3, LOCO_RGBA = 4, LOCO_YV12 = 5, }; typedef struct LOCOContext { AVCodecContext *avctx; int lossy; enum LOCO_MODE mode; } LOCOContext; typedef struct RICEContext { GetBitContext gb; int save, run, run2; /* internal rice decoder state */ int sum, count; /* sum and count for getting rice parameter */ int lossy; } RICEContext; static int loco_get_rice_param(RICEContext *r) { int cnt = 0; int val = r->count; while (r->sum > val && cnt < 9) { val <<= 1; cnt++; } return cnt; } static inline void loco_update_rice_param(RICEContext *r, int val) { r->sum += val; r->count++; if (r->count == 16) { r->sum >>= 1; r->count >>= 1; } } static inline int loco_get_rice(RICEContext *r) { unsigned v; if (r->run > 0) { /* we have zero run */ r->run--; loco_update_rice_param(r, 0); return 0; } if (get_bits_left(&r->gb) < 1) return INT_MIN; v = get_ur_golomb_jpegls(&r->gb, loco_get_rice_param(r), INT_MAX, 0); loco_update_rice_param(r, (v + 1) >> 1); if (!v) { if (r->save >= 0) { r->run = get_ur_golomb_jpegls(&r->gb, 2, INT_MAX, 0); if (r->run > 1) r->save += r->run + 1; else r->save -= 3; } else r->run2++; } else { v = ((v >> 1) + r->lossy) ^ -(v & 1); if (r->run2 > 0) { if (r->run2 > 2) r->save += r->run2; else r->save -= 3; r->run2 = 0; } } return v; } /* LOCO main predictor - LOCO-I/JPEG-LS predictor */ static inline int loco_predict(uint8_t* data, int stride) { int a, b, c; a = data[-stride]; b = data[-1]; c = data[-stride - 1]; return mid_pred(a, a + b - c, b); } static int loco_decode_plane(LOCOContext *l, uint8_t *data, int width, int height, int stride, const uint8_t *buf, int buf_size) { RICEContext rc; unsigned val; int ret; int i, j; if(buf_size<=0) return -1; if ((ret = init_get_bits8(&rc.gb, buf, buf_size)) < 0) return ret; rc.save = 0; rc.run = 0; rc.run2 = 0; rc.lossy = l->lossy; rc.sum = 8; rc.count = 1; /* restore top left pixel */ val = loco_get_rice(&rc); data[0] = 128 + val; /* restore top line */ for (i = 1; i < width; i++) { val = loco_get_rice(&rc); if (val == INT_MIN) return AVERROR_INVALIDDATA; data[i] = data[i - 1] + val; } data += stride; for (j = 1; j < height; j++) { /* restore left column */ val = loco_get_rice(&rc); if (val == INT_MIN) return AVERROR_INVALIDDATA; data[0] = data[-stride] + val; /* restore all other pixels */ for (i = 1; i < width; i++) { val = loco_get_rice(&rc); if (val == INT_MIN) return -1; data[i] = loco_predict(&data[i], stride) + val; } data += stride; } return (get_bits_count(&rc.gb) + 7) >> 3; } static void rotate_faulty_loco(uint8_t *data, int width, int height, int stride) { int y; for (y=1; y<height; y++) { if (width>=y) { memmove(data + y*stride, data + y*(stride + 1), (width-y)); if (y+1 < height) memmove(data + y*stride + (width-y), data + (y+1)*stride, y); } } } static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { LOCOContext * const l = avctx->priv_data; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; AVFrame * const p = data; int decoded, ret; if ((ret = ff_get_buffer(avctx, p, 0)) < 0) return ret; p->key_frame = 1; #define ADVANCE_BY_DECODED do { \ if (decoded < 0 || decoded >= buf_size) goto buf_too_small; \ buf += decoded; buf_size -= decoded; \ } while(0) switch(l->mode) { case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY: decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height, p->linesize[0], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height, p->linesize[1], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height, p->linesize[2], buf, buf_size); break; case LOCO_CYV12: case LOCO_YV12: decoded = loco_decode_plane(l, p->data[0], avctx->width, avctx->height, p->linesize[0], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2, p->linesize[2], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2, p->linesize[1], buf, buf_size); break; case LOCO_CRGB: case LOCO_RGB: decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2], buf, buf_size); if (avctx->width & 1) { rotate_faulty_loco(p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0]); rotate_faulty_loco(p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1]); rotate_faulty_loco(p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2]); } break; case LOCO_CRGBA: case LOCO_RGBA: decoded = loco_decode_plane(l, p->data[1] + p->linesize[1]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[1], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[0], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[2] + p->linesize[2]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[2], buf, buf_size); ADVANCE_BY_DECODED; decoded = loco_decode_plane(l, p->data[3] + p->linesize[3]*(avctx->height-1), avctx->width, avctx->height, -p->linesize[3], buf, buf_size); break; default: av_assert0(0); } if (decoded < 0 || decoded > buf_size) goto buf_too_small; buf_size -= decoded; *got_frame = 1; return avpkt->size - buf_size; buf_too_small: av_log(avctx, AV_LOG_ERROR, "Input data too small.\n"); return AVERROR(EINVAL); } static av_cold int decode_init(AVCodecContext *avctx) { LOCOContext * const l = avctx->priv_data; int version; l->avctx = avctx; if (avctx->extradata_size < 12) { av_log(avctx, AV_LOG_ERROR, "Extradata size must be >= 12 instead of %i\n", avctx->extradata_size); return AVERROR_INVALIDDATA; } version = AV_RL32(avctx->extradata); switch (version) { case 1: l->lossy = 0; break; case 2: l->lossy = AV_RL32(avctx->extradata + 8); break; default: l->lossy = AV_RL32(avctx->extradata + 8); avpriv_request_sample(avctx, "LOCO codec version %i", version); } if (l->lossy > 65536U) { av_log(avctx, AV_LOG_ERROR, "lossy %i is too large\n", l->lossy); return AVERROR_INVALIDDATA; } l->mode = AV_RL32(avctx->extradata + 4); switch (l->mode) { case LOCO_CYUY2: case LOCO_YUY2: case LOCO_UYVY: avctx->pix_fmt = AV_PIX_FMT_YUV422P; break; case LOCO_CRGB: case LOCO_RGB: avctx->pix_fmt = AV_PIX_FMT_GBRP; break; case LOCO_CYV12: case LOCO_YV12: avctx->pix_fmt = AV_PIX_FMT_YUV420P; break; case LOCO_CRGBA: case LOCO_RGBA: avctx->pix_fmt = AV_PIX_FMT_GBRAP; break; default: av_log(avctx, AV_LOG_INFO, "Unknown colorspace, index = %i\n", l->mode); return AVERROR_INVALIDDATA; } if (avctx->debug & FF_DEBUG_PICT_INFO) av_log(avctx, AV_LOG_INFO, "lossy:%i, version:%i, mode: %i\n", l->lossy, version, l->mode); return 0; } const AVCodec ff_loco_decoder = { .name = "loco", .long_name = NULL_IF_CONFIG_SMALL("LOCO"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_LOCO, .priv_data_size = sizeof(LOCOContext), .init = decode_init, .decode = decode_frame, .capabilities = AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, };