| /* |
| * Bitmap Brothers JV video decoder |
| * Copyright (c) 2011 Peter Ross <pross@xvid.org> |
| * |
| * 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 |
| * Bitmap Brothers JV video decoder |
| * @author Peter Ross <pross@xvid.org> |
| */ |
| |
| #include "avcodec.h" |
| #include "dsputil.h" |
| #include "get_bits.h" |
| #include "libavutil/intreadwrite.h" |
| |
| typedef struct JvContext { |
| DSPContext dsp; |
| 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; |
| avctx->pix_fmt = PIX_FMT_PAL8; |
| dsputil_init(&s->dsp, 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, DSPContext *dsp) |
| { |
| int i, j, v[2]; |
| |
| switch (get_bits(gb, 2)) { |
| case 1: |
| v[0] = get_bits(gb, 8); |
| dsp->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 *data_size, |
| 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; |
| |
| video_size = AV_RL32(buf); |
| video_type = buf[4]; |
| buf += 5; |
| |
| if (video_size) { |
| if(video_size < 0) { |
| av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size); |
| return AVERROR_INVALIDDATA; |
| } |
| if (avctx->reget_buffer(avctx, &s->frame) < 0) { |
| av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
| return -1; |
| } |
| |
| 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->dsp); |
| |
| 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++) { |
| uint32_t pal = AV_RB24(buf); |
| s->palette[i] = 0xFF << 24 | pal << 2 | ((pal >> 4) & 0x30303); |
| 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); |
| |
| *data_size = sizeof(AVFrame); |
| *(AVFrame*)data = s->frame; |
| } |
| |
| return buf_size; |
| } |
| |
| static av_cold int decode_close(AVCodecContext *avctx) |
| { |
| JvContext *s = avctx->priv_data; |
| |
| if(s->frame.data[0]) |
| avctx->release_buffer(avctx, &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 = CODEC_ID_JV, |
| .priv_data_size = sizeof(JvContext), |
| .init = decode_init, |
| .close = decode_close, |
| .decode = decode_frame, |
| .capabilities = CODEC_CAP_DR1, |
| }; |
