| 0,0 → 1,312 |
|---|
| /* |
| * 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; |
| int 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) |
| { |
| int v; |
| if (r->run > 0) { /* we have zero run */ |
| r->run--; |
| loco_update_rice_param(r, 0); |
| return 0; |
| } |
| 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 step) |
| { |
| int a, b, c; |
| |
| a = data[-stride]; |
| b = data[-step]; |
| c = data[-stride - step]; |
| |
| 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, int step) |
| { |
| RICEContext rc; |
| int val; |
| int i, j; |
| |
| if(buf_size<=0) |
| return -1; |
| |
| init_get_bits8(&rc.gb, buf, buf_size); |
| 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); |
| data[i * step] = data[i * step - step] + val; |
| } |
| data += stride; |
| for (j = 1; j < height; j++) { |
| /* restore left column */ |
| val = loco_get_rice(&rc); |
| data[0] = data[-stride] + val; |
| /* restore all other pixels */ |
| for (i = 1; i < width; i++) { |
| val = loco_get_rice(&rc); |
| data[i * step] = loco_predict(&data[i * step], stride, step) + val; |
| } |
| data += stride; |
| } |
| |
| return (get_bits_count(&rc.gb) + 7) >> 3; |
| } |
| |
| 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, 1); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height, |
| p->linesize[1], buf, buf_size, 1); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height, |
| p->linesize[2], buf, buf_size, 1); |
| 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, 1); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[2], avctx->width / 2, avctx->height / 2, |
| p->linesize[2], buf, buf_size, 1); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[1], avctx->width / 2, avctx->height / 2, |
| p->linesize[1], buf, buf_size, 1); |
| break; |
| case LOCO_CRGB: case LOCO_RGB: |
| decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, |
| -p->linesize[0], buf, buf_size, 3); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height, |
| -p->linesize[0], buf, buf_size, 3); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height, |
| -p->linesize[0], buf, buf_size, 3); |
| break; |
| case LOCO_CRGBA: |
| case LOCO_RGBA: |
| decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1), avctx->width, avctx->height, |
| -p->linesize[0], buf, buf_size, 4); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 1, avctx->width, avctx->height, |
| -p->linesize[0], buf, buf_size, 4); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 2, avctx->width, avctx->height, |
| -p->linesize[0], buf, buf_size, 4); |
| ADVANCE_BY_DECODED; |
| decoded = loco_decode_plane(l, p->data[0] + p->linesize[0]*(avctx->height-1) + 3, avctx->width, avctx->height, |
| -p->linesize[0], buf, buf_size, 4); |
| 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); |
| } |
| |
| 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_BGR24; |
| 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_BGRA; |
| 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; |
| } |
| |
| 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 = CODEC_CAP_DR1, |
| }; |