247 lines
7.0 KiB
C
Executable File
247 lines
7.0 KiB
C
Executable File
/*
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* Bitmap Brothers JV video decoder
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* Copyright (c) 2011 Peter Ross <pross@xvid.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Bitmap Brothers JV video decoder
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* @author Peter Ross <pross@xvid.org>
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*/
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "get_bits.h"
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#include "internal.h"
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typedef struct JvContext {
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BlockDSPContext bdsp;
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AVFrame *frame;
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uint32_t palette[AVPALETTE_COUNT];
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int palette_has_changed;
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} JvContext;
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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JvContext *s = avctx->priv_data;
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if (!avctx->width || !avctx->height ||
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(avctx->width & 7) || (avctx->height & 7)) {
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av_log(avctx, AV_LOG_ERROR, "Invalid video dimensions: %dx%d\n",
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avctx->width, avctx->height);
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return AVERROR(EINVAL);
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}
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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ff_blockdsp_init(&s->bdsp, avctx);
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return 0;
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}
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/**
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* Decode 2x2 block
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*/
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static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize)
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{
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int i, j, v[2];
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switch (get_bits(gb, 2)) {
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case 1:
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v[0] = get_bits(gb, 8);
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for (j = 0; j < 2; j++)
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memset(dst + j * linesize, v[0], 2);
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break;
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case 2:
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v[0] = get_bits(gb, 8);
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v[1] = get_bits(gb, 8);
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for (j = 0; j < 2; j++)
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for (i = 0; i < 2; i++)
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dst[j * linesize + i] = v[get_bits1(gb)];
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break;
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case 3:
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for (j = 0; j < 2; j++)
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for (i = 0; i < 2; i++)
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dst[j * linesize + i] = get_bits(gb, 8);
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}
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}
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/**
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* Decode 4x4 block
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*/
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static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize)
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{
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int i, j, v[2];
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switch (get_bits(gb, 2)) {
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case 1:
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v[0] = get_bits(gb, 8);
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for (j = 0; j < 4; j++)
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memset(dst + j * linesize, v[0], 4);
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break;
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case 2:
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v[0] = get_bits(gb, 8);
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v[1] = get_bits(gb, 8);
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for (j = 2; j >= 0; j -= 2) {
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for (i = 0; i < 4; i++)
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dst[j * linesize + i] = v[get_bits1(gb)];
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for (i = 0; i < 4; i++)
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dst[(j + 1) * linesize + i] = v[get_bits1(gb)];
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}
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break;
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case 3:
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for (j = 0; j < 4; j += 2)
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for (i = 0; i < 4; i += 2)
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decode2x2(gb, dst + j * linesize + i, linesize);
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}
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}
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/**
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* Decode 8x8 block
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*/
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static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize,
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BlockDSPContext *bdsp)
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{
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int i, j, v[2];
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switch (get_bits(gb, 2)) {
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case 1:
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v[0] = get_bits(gb, 8);
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bdsp->fill_block_tab[1](dst, v[0], linesize, 8);
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break;
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case 2:
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v[0] = get_bits(gb, 8);
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v[1] = get_bits(gb, 8);
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for (j = 7; j >= 0; j--)
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for (i = 0; i < 8; i++)
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dst[j * linesize + i] = v[get_bits1(gb)];
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break;
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case 3:
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for (j = 0; j < 8; j += 4)
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for (i = 0; i < 8; i += 4)
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decode4x4(gb, dst + j * linesize + i, linesize);
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}
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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JvContext *s = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = buf + avpkt->size;
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int video_size, video_type, i, j, ret;
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if (avpkt->size < 6)
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return AVERROR_INVALIDDATA;
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video_size = AV_RL32(buf);
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video_type = buf[4];
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buf += 5;
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if (video_size) {
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if (video_size < 0 || video_size > avpkt->size - 5) {
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av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size);
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return AVERROR_INVALIDDATA;
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}
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if (video_type == 0 || video_type == 1) {
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GetBitContext gb;
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init_get_bits(&gb, buf, 8 * video_size);
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if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
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return ret;
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if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
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av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
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return AVERROR_INVALIDDATA;
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}
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for (j = 0; j < avctx->height; j += 8)
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for (i = 0; i < avctx->width; i += 8)
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decode8x8(&gb,
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s->frame->data[0] + j * s->frame->linesize[0] + i,
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s->frame->linesize[0], &s->bdsp);
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buf += video_size;
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} else if (video_type == 2) {
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int v = *buf++;
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av_frame_unref(s->frame);
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if ((ret = ff_get_buffer(avctx, s->frame, AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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for (j = 0; j < avctx->height; j++)
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memset(s->frame->data[0] + j * s->frame->linesize[0],
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v, avctx->width);
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} else {
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av_log(avctx, AV_LOG_WARNING,
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"unsupported frame type %i\n", video_type);
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return AVERROR_INVALIDDATA;
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}
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}
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if (buf_end - buf >= AVPALETTE_COUNT * 3) {
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for (i = 0; i < AVPALETTE_COUNT; i++) {
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uint32_t pal = AV_RB24(buf);
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s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303);
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buf += 3;
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}
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s->palette_has_changed = 1;
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}
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if (video_size) {
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s->frame->key_frame = 1;
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s->frame->pict_type = AV_PICTURE_TYPE_I;
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s->frame->palette_has_changed = s->palette_has_changed;
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s->palette_has_changed = 0;
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memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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*got_frame = 1;
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}
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return avpkt->size;
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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JvContext *s = avctx->priv_data;
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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_jv_decoder = {
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.name = "jv",
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.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_JV,
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.priv_data_size = sizeof(JvContext),
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.init = decode_init,
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.close = decode_close,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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