/* * Bitmap Brothers JV video decoder * Copyright (c) 2011 Peter Ross <pross@xvid.org> * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Bitmap Brothers JV video decoder * @author Peter Ross <pross@xvid.org> */ #include "libavutil/intreadwrite.h" #include "avcodec.h" #include "blockdsp.h" #include "get_bits.h" #include "internal.h" typedef struct JvContext { BlockDSPContext bdsp; AVFrame *frame; uint32_t palette[AVPALETTE_COUNT]; int palette_has_changed; } JvContext; static av_cold int decode_init(AVCodecContext *avctx) { JvContext *s = avctx->priv_data; if (!avctx->width || !avctx->height || (avctx->width & 7) || (avctx->height & 7)) { av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n", avctx->width, avctx->height); return AVERROR(EINVAL); } s->frame = av_frame_alloc(); if (!s->frame) return AVERROR(ENOMEM); avctx->pix_fmt = AV_PIX_FMT_PAL8; ff_blockdsp_init(&s->bdsp, avctx); return 0; } /** * Decode 2x2 block */ static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize) { int i, j, v[2]; switch (get_bits(gb, 2)) { case 1: v[0] = get_bits(gb, 8); for (j = 0; j < 2; j++) memset(dst + j * linesize, v[0], 2); break; case 2: v[0] = get_bits(gb, 8); v[1] = get_bits(gb, 8); for (j = 0; j < 2; j++) for (i = 0; i < 2; i++) dst[j * linesize + i] = v[get_bits1(gb)]; break; case 3: for (j = 0; j < 2; j++) for (i = 0; i < 2; i++) dst[j * linesize + i] = get_bits(gb, 8); } } /** * Decode 4x4 block */ static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize) { int i, j, v[2]; switch (get_bits(gb, 2)) { case 1: v[0] = get_bits(gb, 8); for (j = 0; j < 4; j++) memset(dst + j * linesize, v[0], 4); break; case 2: v[0] = get_bits(gb, 8); v[1] = get_bits(gb, 8); for (j = 2; j >= 0; j -= 2) { for (i = 0; i < 4; i++) dst[j * linesize + i] = v[get_bits1(gb)]; for (i = 0; i < 4; i++) dst[(j + 1) * linesize + i] = v[get_bits1(gb)]; } break; case 3: for (j = 0; j < 4; j += 2) for (i = 0; i < 4; i += 2) decode2x2(gb, dst + j * linesize + i, linesize); } } /** * Decode 8x8 block */ static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, BlockDSPContext *bdsp) { int i, j, v[2]; switch (get_bits(gb, 2)) { case 1: v[0] = get_bits(gb, 8); bdsp->fill_block_tab[1](dst, v[0], linesize, 8); break; case 2: v[0] = get_bits(gb, 8); v[1] = get_bits(gb, 8); for (j = 7; j >= 0; j--) for (i = 0; i < 8; i++) dst[j * linesize + i] = v[get_bits1(gb)]; break; case 3: for (j = 0; j < 8; j += 4) for (i = 0; i < 8; i += 4) decode4x4(gb, dst + j * linesize + i, linesize); } } static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { JvContext *s = avctx->priv_data; int buf_size = avpkt->size; const uint8_t *buf = avpkt->data; const uint8_t *buf_end = buf + buf_size; int video_size, video_type, i, j, ret; video_size = AV_RL32(buf); video_type = buf[4]; buf += 5; if (video_size) { if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } if (video_type == 0 || video_type == 1) { GetBitContext gb; init_get_bits(&gb, buf, 8 * FFMIN(video_size, buf_end - buf)); for (j = 0; j < avctx->height; j += 8) for (i = 0; i < avctx->width; i += 8) decode8x8(&gb, s->frame->data[0] + j * s->frame->linesize[0] + i, s->frame->linesize[0], &s->bdsp); buf += video_size; } else if (video_type == 2) { if (buf + 1 <= buf_end) { int v = *buf++; for (j = 0; j < avctx->height; j++) memset(s->frame->data[0] + j * s->frame->linesize[0], v, avctx->width); } } else { av_log(avctx, AV_LOG_WARNING, "unsupported frame type %i\n", video_type); return AVERROR_INVALIDDATA; } } if (buf < buf_end) { for (i = 0; i < AVPALETTE_COUNT && buf + 3 <= buf_end; i++) { s->palette[i] = AV_RB24(buf) << 2; buf += 3; } s->palette_has_changed = 1; } if (video_size) { s->frame->key_frame = 1; s->frame->pict_type = AV_PICTURE_TYPE_I; s->frame->palette_has_changed = s->palette_has_changed; s->palette_has_changed = 0; memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); if ((ret = av_frame_ref(data, s->frame)) < 0) return ret; *got_frame = 1; } return buf_size; } static av_cold int decode_close(AVCodecContext *avctx) { JvContext *s = avctx->priv_data; av_frame_free(&s->frame); return 0; } AVCodec ff_jv_decoder = { .name = "jv", .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_JV, .priv_data_size = sizeof(JvContext), .init = decode_init, .close = decode_close, .decode = decode_frame, .capabilities = AV_CODEC_CAP_DR1, };