diff options
Diffstat (limited to 'ffmpeg1/libavcodec/loco.c')
| -rw-r--r-- | ffmpeg1/libavcodec/loco.c | 312 |
1 files changed, 0 insertions, 312 deletions
diff --git a/ffmpeg1/libavcodec/loco.c b/ffmpeg1/libavcodec/loco.c deleted file mode 100644 index ffb9742..0000000 --- a/ffmpeg1/libavcodec/loco.c +++ /dev/null @@ -1,312 +0,0 @@ -/* - * 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_bits(&rc.gb, buf, buf_size*8); - 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", - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_LOCO, - .priv_data_size = sizeof(LOCOContext), - .init = decode_init, - .decode = decode_frame, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("LOCO"), -}; |