From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:57:22 +0100 Subject: making act segmenter --- ffmpeg/libavcodec/wnv1.c | 160 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 160 insertions(+) create mode 100644 ffmpeg/libavcodec/wnv1.c (limited to 'ffmpeg/libavcodec/wnv1.c') diff --git a/ffmpeg/libavcodec/wnv1.c b/ffmpeg/libavcodec/wnv1.c new file mode 100644 index 0000000..162dd1f --- /dev/null +++ b/ffmpeg/libavcodec/wnv1.c @@ -0,0 +1,160 @@ +/* + * Winnov WNV1 codec + * Copyright (c) 2005 Konstantin Shishkov + * + * 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 + * Winnov WNV1 codec. + */ + +#include "avcodec.h" +#include "get_bits.h" +#include "internal.h" +#include "mathops.h" + + +typedef struct WNV1Context { + AVCodecContext *avctx; + + int shift; + GetBitContext gb; +} WNV1Context; + +static const uint16_t code_tab[16][2] = { + { 0x1FD, 9 }, { 0xFD, 8 }, { 0x7D, 7 }, { 0x3D, 6 }, { 0x1D, 5 }, { 0x0D, 4 }, { 0x005, 3 }, + { 0x000, 1 }, + { 0x004, 3 }, { 0x0C, 4 }, { 0x1C, 5 }, { 0x3C, 6 }, { 0x7C, 7 }, { 0xFC, 8 }, { 0x1FC, 9 }, { 0xFF, 8 } +}; + +#define CODE_VLC_BITS 9 +static VLC code_vlc; + +/* returns modified base_value */ +static inline int wnv1_get_code(WNV1Context *w, int base_value) +{ + int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1); + + if (v == 15) + return ff_reverse[get_bits(&w->gb, 8 - w->shift)]; + else + return base_value + ((v - 7) << w->shift); +} + +static int decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + WNV1Context * const l = avctx->priv_data; + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + AVFrame * const p = data; + unsigned char *Y,*U,*V; + int i, j, ret; + int prev_y = 0, prev_u = 0, prev_v = 0; + uint8_t *rbuf; + + if(buf_size<=8) { + av_log(avctx, AV_LOG_ERROR, "buf_size %d is too small\n", buf_size); + return AVERROR_INVALIDDATA; + } + + rbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!rbuf) { + av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n"); + return AVERROR(ENOMEM); + } + + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) { + av_free(rbuf); + return ret; + } + p->key_frame = 1; + + for (i = 8; i < buf_size; i++) + rbuf[i] = ff_reverse[buf[i]]; + init_get_bits(&l->gb, rbuf + 8, (buf_size - 8) * 8); + + if (buf[2] >> 4 == 6) + l->shift = 2; + else { + l->shift = 8 - (buf[2] >> 4); + if (l->shift > 4) { + avpriv_request_sample(avctx, + "Unknown WNV1 frame header value %i", + buf[2] >> 4); + l->shift = 4; + } + if (l->shift < 1) { + avpriv_request_sample(avctx, + "Unknown WNV1 frame header value %i", + buf[2] >> 4); + l->shift = 1; + } + } + + Y = p->data[0]; + U = p->data[1]; + V = p->data[2]; + for (j = 0; j < avctx->height; j++) { + for (i = 0; i < avctx->width / 2; i++) { + Y[i * 2] = wnv1_get_code(l, prev_y); + prev_u = U[i] = wnv1_get_code(l, prev_u); + prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]); + prev_v = V[i] = wnv1_get_code(l, prev_v); + } + Y += p->linesize[0]; + U += p->linesize[1]; + V += p->linesize[2]; + } + + + *got_frame = 1; + av_free(rbuf); + + return buf_size; +} + +static av_cold int decode_init(AVCodecContext *avctx) +{ + WNV1Context * const l = avctx->priv_data; + static VLC_TYPE code_table[1 << CODE_VLC_BITS][2]; + + l->avctx = avctx; + avctx->pix_fmt = AV_PIX_FMT_YUV422P; + + code_vlc.table = code_table; + code_vlc.table_allocated = 1 << CODE_VLC_BITS; + init_vlc(&code_vlc, CODE_VLC_BITS, 16, + &code_tab[0][1], 4, 2, + &code_tab[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC); + + return 0; +} + +AVCodec ff_wnv1_decoder = { + .name = "wnv1", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_WNV1, + .priv_data_size = sizeof(WNV1Context), + .init = decode_init, + .decode = decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"), +}; -- cgit v1.2.3