yading@10: /*
yading@10:  * Intel Indeo 2 codec
yading@10:  * Copyright (c) 2005 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * Intel Indeo 2 decoder.
yading@10:  */
yading@10: 
yading@10: #define BITSTREAM_READER_LE
yading@10: #include "libavutil/attributes.h"
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "indeo2data.h"
yading@10: #include "internal.h"
yading@10: #include "mathops.h"
yading@10: 
yading@10: typedef struct Ir2Context{
yading@10:     AVCodecContext *avctx;
yading@10:     AVFrame picture;
yading@10:     GetBitContext gb;
yading@10:     int decode_delta;
yading@10: } Ir2Context;
yading@10: 
yading@10: #define CODE_VLC_BITS 14
yading@10: static VLC ir2_vlc;
yading@10: 
yading@10: /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
yading@10: static inline int ir2_get_code(GetBitContext *gb)
yading@10: {
yading@10:     return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
yading@10: }
yading@10: 
yading@10: static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
yading@10:                             int stride, const uint8_t *table)
yading@10: {
yading@10:     int i;
yading@10:     int j;
yading@10:     int out = 0;
yading@10:     int c;
yading@10:     int t;
yading@10: 
yading@10:     if (width & 1)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     /* first line contain absolute values, other lines contain deltas */
yading@10:     while (out < width) {
yading@10:         c = ir2_get_code(&ctx->gb);
yading@10:         if (c >= 0x80) { /* we have a run */
yading@10:             c -= 0x7F;
yading@10:             if (out + c*2 > width)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             for (i = 0; i < c * 2; i++)
yading@10:                 dst[out++] = 0x80;
yading@10:         } else { /* copy two values from table */
yading@10:             dst[out++] = table[c * 2];
yading@10:             dst[out++] = table[(c * 2) + 1];
yading@10:         }
yading@10:     }
yading@10:     dst += stride;
yading@10: 
yading@10:     for (j = 1; j < height; j++) {
yading@10:         out = 0;
yading@10:         while (out < width) {
yading@10:             c = ir2_get_code(&ctx->gb);
yading@10:             if (c >= 0x80) { /* we have a skip */
yading@10:                 c -= 0x7F;
yading@10:                 if (out + c*2 > width)
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 for (i = 0; i < c * 2; i++) {
yading@10:                     dst[out] = dst[out - stride];
yading@10:                     out++;
yading@10:                 }
yading@10:             } else { /* add two deltas from table */
yading@10:                 t        = dst[out - stride] + (table[c * 2] - 128);
yading@10:                 t        = av_clip_uint8(t);
yading@10:                 dst[out] = t;
yading@10:                 out++;
yading@10:                 t        = dst[out - stride] + (table[(c * 2) + 1] - 128);
yading@10:                 t        = av_clip_uint8(t);
yading@10:                 dst[out] = t;
yading@10:                 out++;
yading@10:             }
yading@10:         }
yading@10:         dst += stride;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
yading@10:                                   int stride, const uint8_t *table)
yading@10: {
yading@10:     int j;
yading@10:     int out = 0;
yading@10:     int c;
yading@10:     int t;
yading@10: 
yading@10:     if (width & 1)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     for (j = 0; j < height; j++) {
yading@10:         out = 0;
yading@10:         while (out < width) {
yading@10:             c = ir2_get_code(&ctx->gb);
yading@10:             if (c >= 0x80) { /* we have a skip */
yading@10:                 c   -= 0x7F;
yading@10:                 out += c * 2;
yading@10:             } else { /* add two deltas from table */
yading@10:                 t        = dst[out] + (((table[c * 2] - 128)*3) >> 2);
yading@10:                 t        = av_clip_uint8(t);
yading@10:                 dst[out] = t;
yading@10:                 out++;
yading@10:                 t        = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
yading@10:                 t        = av_clip_uint8(t);
yading@10:                 dst[out] = t;
yading@10:                 out++;
yading@10:             }
yading@10:         }
yading@10:         dst += stride;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int ir2_decode_frame(AVCodecContext *avctx,
yading@10:                         void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     Ir2Context * const s = avctx->priv_data;
yading@10:     const uint8_t *buf   = avpkt->data;
yading@10:     int buf_size         = avpkt->size;
yading@10:     AVFrame *picture     = data;
yading@10:     AVFrame * const p    = &s->picture;
yading@10:     int start, ret;
yading@10: 
yading@10:     if ((ret = ff_reget_buffer(avctx, p)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     start = 48; /* hardcoded for now */
yading@10: 
yading@10:     if (start >= buf_size) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     s->decode_delta = buf[18];
yading@10: 
yading@10:     /* decide whether frame uses deltas or not */
yading@10: #ifndef BITSTREAM_READER_LE
yading@10:     for (i = 0; i < buf_size; i++)
yading@10:         buf[i] = ff_reverse[buf[i]];
yading@10: #endif
yading@10: 
yading@10:     init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
yading@10: 
yading@10:     if (s->decode_delta) { /* intraframe */
yading@10:         if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
yading@10:                                     s->picture.data[0], s->picture.linesize[0],
yading@10:                                     ir2_luma_table)) < 0)
yading@10:             return ret;
yading@10: 
yading@10:         /* swapped U and V */
yading@10:         if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
yading@10:                                     s->picture.data[2], s->picture.linesize[2],
yading@10:                                     ir2_luma_table)) < 0)
yading@10:             return ret;
yading@10:         if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
yading@10:                                     s->picture.data[1], s->picture.linesize[1],
yading@10:                                     ir2_luma_table)) < 0)
yading@10:             return ret;
yading@10:     } else { /* interframe */
yading@10:         if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
yading@10:                                           s->picture.data[0], s->picture.linesize[0],
yading@10:                                           ir2_luma_table)) < 0)
yading@10:             return ret;
yading@10:         /* swapped U and V */
yading@10:         if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
yading@10:                                           s->picture.data[2], s->picture.linesize[2],
yading@10:                                           ir2_luma_table)) < 0)
yading@10:             return ret;
yading@10:         if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
yading@10:                                           s->picture.data[1], s->picture.linesize[1],
yading@10:                                           ir2_luma_table)) < 0)
yading@10:             return ret;
yading@10:     }
yading@10: 
yading@10:     if ((ret = av_frame_ref(picture, &s->picture)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int ir2_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     Ir2Context * const ic = avctx->priv_data;
yading@10:     static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
yading@10: 
yading@10:     avcodec_get_frame_defaults(&ic->picture);
yading@10:     ic->avctx = avctx;
yading@10: 
yading@10:     avctx->pix_fmt= AV_PIX_FMT_YUV410P;
yading@10: 
yading@10:     avcodec_get_frame_defaults(&ic->picture);
yading@10: 
yading@10:     ir2_vlc.table = vlc_tables;
yading@10:     ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
yading@10: #ifdef BITSTREAM_READER_LE
yading@10:         init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
yading@10:                  &ir2_codes[0][1], 4, 2,
yading@10:                  &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
yading@10: #else
yading@10:         init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
yading@10:                  &ir2_codes[0][1], 4, 2,
yading@10:                  &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
yading@10: #endif
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int ir2_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     Ir2Context * const ic = avctx->priv_data;
yading@10:     AVFrame *pic = &ic->picture;
yading@10: 
yading@10:     av_frame_unref(pic);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_indeo2_decoder = {
yading@10:     .name           = "indeo2",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_INDEO2,
yading@10:     .priv_data_size = sizeof(Ir2Context),
yading@10:     .init           = ir2_decode_init,
yading@10:     .close          = ir2_decode_end,
yading@10:     .decode         = ir2_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
yading@10: };