| /* |
| * Copyright (C) 2003 The FFmpeg project |
| * |
| * 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 |
| * id RoQ Video Decoder by Dr. Tim Ferguson |
| * For more information about the id RoQ format, visit: |
| * http://www.csse.monash.edu.au/~timf/ |
| */ |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/imgutils.h" |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| #include "roqvideo.h" |
| |
| static void roqvideo_decode_frame(RoqContext *ri, GetByteContext *gb) |
| { |
| unsigned int chunk_id = 0, chunk_arg = 0; |
| unsigned long chunk_size = 0; |
| int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1; |
| int vqid, xpos, ypos, xp, yp, x, y, mx, my; |
| roq_qcell *qcell; |
| int64_t chunk_start; |
| |
| while (bytestream2_get_bytes_left(gb) >= 8) { |
| chunk_id = bytestream2_get_le16(gb); |
| chunk_size = bytestream2_get_le32(gb); |
| chunk_arg = bytestream2_get_le16(gb); |
| |
| if(chunk_id == RoQ_QUAD_VQ) |
| break; |
| if(chunk_id == RoQ_QUAD_CODEBOOK) { |
| if((nv1 = chunk_arg >> 8) == 0) |
| nv1 = 256; |
| if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size) |
| nv2 = 256; |
| for(i = 0; i < nv1; i++) { |
| ri->cb2x2[i].y[0] = bytestream2_get_byte(gb); |
| ri->cb2x2[i].y[1] = bytestream2_get_byte(gb); |
| ri->cb2x2[i].y[2] = bytestream2_get_byte(gb); |
| ri->cb2x2[i].y[3] = bytestream2_get_byte(gb); |
| ri->cb2x2[i].u = bytestream2_get_byte(gb); |
| ri->cb2x2[i].v = bytestream2_get_byte(gb); |
| } |
| for(i = 0; i < nv2; i++) |
| for(j = 0; j < 4; j++) |
| ri->cb4x4[i].idx[j] = bytestream2_get_byte(gb); |
| } |
| } |
| |
| chunk_start = bytestream2_tell(gb); |
| xpos = ypos = 0; |
| |
| if (chunk_size > bytestream2_get_bytes_left(gb)) { |
| av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n"); |
| chunk_size = bytestream2_get_bytes_left(gb); |
| } |
| |
| while (bytestream2_tell(gb) < chunk_start + chunk_size) { |
| for (yp = ypos; yp < ypos + 16; yp += 8) |
| for (xp = xpos; xp < xpos + 16; xp += 8) { |
| if (bytestream2_tell(gb) >= chunk_start + chunk_size) { |
| av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n"); |
| return; |
| } |
| if (vqflg_pos < 0) { |
| vqflg = bytestream2_get_le16(gb); |
| vqflg_pos = 7; |
| } |
| vqid = (vqflg >> (vqflg_pos * 2)) & 0x3; |
| vqflg_pos--; |
| |
| switch(vqid) { |
| case RoQ_ID_MOT: |
| break; |
| case RoQ_ID_FCC: { |
| int byte = bytestream2_get_byte(gb); |
| mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8)); |
| my = 8 - (byte & 0xf) - ((signed char) chunk_arg); |
| ff_apply_motion_8x8(ri, xp, yp, mx, my); |
| break; |
| } |
| case RoQ_ID_SLD: |
| qcell = ri->cb4x4 + bytestream2_get_byte(gb); |
| ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]); |
| ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]); |
| ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]); |
| ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]); |
| break; |
| case RoQ_ID_CCC: |
| for (k = 0; k < 4; k++) { |
| x = xp; y = yp; |
| if(k & 0x01) x += 4; |
| if(k & 0x02) y += 4; |
| |
| if (bytestream2_tell(gb) >= chunk_start + chunk_size) { |
| av_log(ri->avctx, AV_LOG_VERBOSE, "Chunk is too short\n"); |
| return; |
| } |
| if (vqflg_pos < 0) { |
| vqflg = bytestream2_get_le16(gb); |
| vqflg_pos = 7; |
| } |
| vqid = (vqflg >> (vqflg_pos * 2)) & 0x3; |
| vqflg_pos--; |
| switch(vqid) { |
| case RoQ_ID_MOT: |
| break; |
| case RoQ_ID_FCC: { |
| int byte = bytestream2_get_byte(gb); |
| mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8)); |
| my = 8 - (byte & 0xf) - ((signed char) chunk_arg); |
| ff_apply_motion_4x4(ri, x, y, mx, my); |
| break; |
| } |
| case RoQ_ID_SLD: |
| qcell = ri->cb4x4 + bytestream2_get_byte(gb); |
| ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]); |
| ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]); |
| ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]); |
| ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]); |
| break; |
| case RoQ_ID_CCC: |
| ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(gb)); |
| ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(gb)); |
| ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(gb)); |
| ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(gb)); |
| break; |
| } |
| } |
| break; |
| default: |
| av_assert2(0); |
| } |
| } |
| |
| xpos += 16; |
| if (xpos >= ri->width) { |
| xpos -= ri->width; |
| ypos += 16; |
| } |
| if(ypos >= ri->height) |
| break; |
| } |
| } |
| |
| |
| static av_cold int roq_decode_init(AVCodecContext *avctx) |
| { |
| RoqContext *s = avctx->priv_data; |
| |
| s->avctx = avctx; |
| |
| if (avctx->width % 16 || avctx->height % 16) { |
| avpriv_request_sample(avctx, "Dimensions not being a multiple of 16"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| s->width = avctx->width; |
| s->height = avctx->height; |
| |
| s->last_frame = av_frame_alloc(); |
| s->current_frame = av_frame_alloc(); |
| if (!s->current_frame || !s->last_frame) |
| return AVERROR(ENOMEM); |
| |
| avctx->pix_fmt = AV_PIX_FMT_YUVJ444P; |
| avctx->color_range = AVCOL_RANGE_JPEG; |
| |
| return 0; |
| } |
| |
| static int roq_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| RoqContext *s = avctx->priv_data; |
| int copy = !s->current_frame->data[0] && s->last_frame->data[0]; |
| GetByteContext gb; |
| int ret; |
| |
| if ((ret = ff_reget_buffer(avctx, s->current_frame, 0)) < 0) |
| return ret; |
| |
| if (copy) { |
| ret = av_frame_copy(s->current_frame, s->last_frame); |
| if (ret < 0) |
| return ret; |
| } |
| |
| bytestream2_init(&gb, buf, buf_size); |
| roqvideo_decode_frame(s, &gb); |
| |
| if ((ret = av_frame_ref(data, s->current_frame)) < 0) |
| return ret; |
| *got_frame = 1; |
| |
| /* shuffle frames */ |
| FFSWAP(AVFrame *, s->current_frame, s->last_frame); |
| |
| return buf_size; |
| } |
| |
| static av_cold int roq_decode_end(AVCodecContext *avctx) |
| { |
| RoqContext *s = avctx->priv_data; |
| |
| av_frame_free(&s->current_frame); |
| av_frame_free(&s->last_frame); |
| |
| return 0; |
| } |
| |
| AVCodec ff_roq_decoder = { |
| .name = "roqvideo", |
| .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_ROQ, |
| .priv_data_size = sizeof(RoqContext), |
| .init = roq_decode_init, |
| .close = roq_decode_end, |
| .decode = roq_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, |
| }; |
