/* * Intel Indeo 2 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 * Intel Indeo 2 decoder. */ #define BITSTREAM_READER_LE #include "libavutil/attributes.h" #include "avcodec.h" #include "get_bits.h" #include "indeo2data.h" #include "internal.h" #include "mathops.h" typedef struct Ir2Context{ AVCodecContext *avctx; AVFrame *picture; GetBitContext gb; int decode_delta; } Ir2Context; #define CODE_VLC_BITS 14 static VLC ir2_vlc; /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */ static inline int ir2_get_code(GetBitContext *gb) { return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1; } static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int pitch, const uint8_t *table) { int i; int j; int out = 0; int c; int t; if (width & 1) return AVERROR_INVALIDDATA; /* first line contain absolute values, other lines contain deltas */ while (out < width) { c = ir2_get_code(&ctx->gb); if (c >= 0x80) { /* we have a run */ c -= 0x7F; if (out + c*2 > width) return AVERROR_INVALIDDATA; for (i = 0; i < c * 2; i++) dst[out++] = 0x80; } else { /* copy two values from table */ dst[out++] = table[c * 2]; dst[out++] = table[(c * 2) + 1]; } } dst += pitch; for (j = 1; j < height; j++) { out = 0; while (out < width) { c = ir2_get_code(&ctx->gb); if (c >= 0x80) { /* we have a skip */ c -= 0x7F; if (out + c*2 > width) return AVERROR_INVALIDDATA; for (i = 0; i < c * 2; i++) { dst[out] = dst[out - pitch]; out++; } } else { /* add two deltas from table */ t = dst[out - pitch] + (table[c * 2] - 128); t = av_clip_uint8(t); dst[out] = t; out++; t = dst[out - pitch] + (table[(c * 2) + 1] - 128); t = av_clip_uint8(t); dst[out] = t; out++; } } dst += pitch; } return 0; } static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int pitch, const uint8_t *table) { int j; int out = 0; int c; int t; if (width & 1) return AVERROR_INVALIDDATA; for (j = 0; j < height; j++) { out = 0; while (out < width) { c = ir2_get_code(&ctx->gb); if (c >= 0x80) { /* we have a skip */ c -= 0x7F; out += c * 2; } else { /* add two deltas from table */ t = dst[out] + (((table[c * 2] - 128)*3) >> 2); t = av_clip_uint8(t); dst[out] = t; out++; t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2); t = av_clip_uint8(t); dst[out] = t; out++; } } dst += pitch; } return 0; } static int ir2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { Ir2Context * const s = avctx->priv_data; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; AVFrame *picture = data; AVFrame * const p = s->picture; int start, ret; int ltab, ctab; if ((ret = ff_reget_buffer(avctx, p)) < 0) return ret; start = 48; /* hardcoded for now */ if (start >= buf_size) { av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size); return AVERROR_INVALIDDATA; } s->decode_delta = buf[18]; /* decide whether frame uses deltas or not */ #ifndef BITSTREAM_READER_LE for (i = 0; i < buf_size; i++) buf[i] = ff_reverse[buf[i]]; #endif init_get_bits(&s->gb, buf + start, (buf_size - start) * 8); ltab = buf[0x22] & 3; ctab = buf[0x22] >> 2; if (ctab > 3) { av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab); return AVERROR_INVALIDDATA; } if (s->decode_delta) { /* intraframe */ if ((ret = ir2_decode_plane(s, avctx->width, avctx->height, p->data[0], p->linesize[0], ir2_delta_table[ltab])) < 0) return ret; /* swapped U and V */ if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, p->data[2], p->linesize[2], ir2_delta_table[ctab])) < 0) return ret; if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, p->data[1], p->linesize[1], ir2_delta_table[ctab])) < 0) return ret; } else { /* interframe */ if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height, p->data[0], p->linesize[0], ir2_delta_table[ltab])) < 0) return ret; /* swapped U and V */ if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, p->data[2], p->linesize[2], ir2_delta_table[ctab])) < 0) return ret; if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, p->data[1], p->linesize[1], ir2_delta_table[ctab])) < 0) return ret; } if ((ret = av_frame_ref(picture, p)) < 0) return ret; *got_frame = 1; return buf_size; } static av_cold int ir2_decode_init(AVCodecContext *avctx) { Ir2Context * const ic = avctx->priv_data; static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2]; ic->avctx = avctx; avctx->pix_fmt= AV_PIX_FMT_YUV410P; ic->picture = av_frame_alloc(); if (!ic->picture) return AVERROR(ENOMEM); ir2_vlc.table = vlc_tables; ir2_vlc.table_allocated = 1 << CODE_VLC_BITS; #ifdef BITSTREAM_READER_LE init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, &ir2_codes[0][1], 4, 2, &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE); #else init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, &ir2_codes[0][1], 4, 2, &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC); #endif return 0; } static av_cold int ir2_decode_end(AVCodecContext *avctx) { Ir2Context * const ic = avctx->priv_data; av_frame_free(&ic->picture); return 0; } AVCodec ff_indeo2_decoder = { .name = "indeo2", .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_INDEO2, .priv_data_size = sizeof(Ir2Context), .init = ir2_decode_init, .close = ir2_decode_end, .decode = ir2_decode_frame, .capabilities = CODEC_CAP_DR1, };