From 741fb4b9e135cfb161a749db88713229038577bb Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:55:35 +0100 Subject: making act segmenter --- ffmpeg1/libavcodec/tscc2.c | 377 --------------------------------------------- 1 file changed, 377 deletions(-) delete mode 100644 ffmpeg1/libavcodec/tscc2.c (limited to 'ffmpeg1/libavcodec/tscc2.c') diff --git a/ffmpeg1/libavcodec/tscc2.c b/ffmpeg1/libavcodec/tscc2.c deleted file mode 100644 index f275ff9..0000000 --- a/ffmpeg1/libavcodec/tscc2.c +++ /dev/null @@ -1,377 +0,0 @@ -/* - * TechSmith Screen Codec 2 (aka Dora) decoder - * Copyright (c) 2012 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 - * TechSmith Screen Codec 2 decoder - */ - -#define BITSTREAM_READER_LE -#include "avcodec.h" -#include "get_bits.h" -#include "bytestream.h" -#include "internal.h" -#include "tscc2data.h" - -typedef struct TSCC2Context { - AVCodecContext *avctx; - AVFrame pic; - int mb_width, mb_height; - uint8_t *slice_quants; - int quant[2]; - int q[2][3]; - GetBitContext gb; - - VLC dc_vlc, nc_vlc[NUM_VLC_SETS], ac_vlc[NUM_VLC_SETS]; - int block[16]; -} TSCC2Context; - -static av_cold void free_vlcs(TSCC2Context *c) -{ - int i; - - ff_free_vlc(&c->dc_vlc); - for (i = 0; i < NUM_VLC_SETS; i++) { - ff_free_vlc(c->nc_vlc + i); - ff_free_vlc(c->ac_vlc + i); - } -} - -static av_cold int init_vlcs(TSCC2Context *c) -{ - int i, ret; - - ret = ff_init_vlc_sparse(&c->dc_vlc, 9, DC_VLC_COUNT, - tscc2_dc_vlc_bits, 1, 1, - tscc2_dc_vlc_codes, 2, 2, - tscc2_dc_vlc_syms, 2, 2, INIT_VLC_LE); - if (ret) - return ret; - - for (i = 0; i < NUM_VLC_SETS; i++) { - ret = ff_init_vlc_sparse(c->nc_vlc + i, 9, 16, - tscc2_nc_vlc_bits[i], 1, 1, - tscc2_nc_vlc_codes[i], 2, 2, - tscc2_nc_vlc_syms, 1, 1, INIT_VLC_LE); - if (ret) { - free_vlcs(c); - return ret; - } - ret = ff_init_vlc_sparse(c->ac_vlc + i, 9, tscc2_ac_vlc_sizes[i], - tscc2_ac_vlc_bits[i], 1, 1, - tscc2_ac_vlc_codes[i], 2, 2, - tscc2_ac_vlc_syms[i], 2, 2, INIT_VLC_LE); - if (ret) { - free_vlcs(c); - return ret; - } - } - - return 0; -} - -#define DEQUANT(val, q) ((q * val + 0x80) >> 8) -#define DCT1D(d0, d1, d2, d3, s0, s1, s2, s3, OP) \ - OP(d0, 5 * ((s0) + (s1) + (s2)) + 2 * (s3)); \ - OP(d1, 5 * ((s0) - (s2) - (s3)) + 2 * (s1)); \ - OP(d2, 5 * ((s0) - (s2) + (s3)) - 2 * (s1)); \ - OP(d3, 5 * ((s0) - (s1) + (s2)) - 2 * (s3)); \ - -#define COL_OP(a, b) a = b -#define ROW_OP(a, b) a = ((b) + 0x20) >> 6 - -static void tscc2_idct4_put(int *in, int q[3], uint8_t *dst, int stride) -{ - int i; - int tblk[4 * 4]; - int t0, t1, t2, t3; - - for (i = 0; i < 4; i++) { - t0 = DEQUANT(q[0 + (i & 1)], in[0 * 4 + i]); - t1 = DEQUANT(q[1 + (i & 1)], in[1 * 4 + i]); - t2 = DEQUANT(q[0 + (i & 1)], in[2 * 4 + i]); - t3 = DEQUANT(q[1 + (i & 1)], in[3 * 4 + i]); - DCT1D(tblk[0 * 4 + i], tblk[1 * 4 + i], - tblk[2 * 4 + i], tblk[3 * 4 + i], - t0, t1, t2, t3, COL_OP); - } - for (i = 0; i < 4; i++) { - DCT1D(dst[0], dst[1], dst[2], dst[3], - tblk[i * 4 + 0], tblk[i * 4 + 1], - tblk[i * 4 + 2], tblk[i * 4 + 3], ROW_OP); - dst += stride; - } -} - -static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set, - uint8_t *dst, int stride, int plane) -{ - GetBitContext *gb = &c->gb; - int prev_dc, dc, nc, ac, bpos, val; - int i, j, k, l; - - if (get_bits1(gb)) { - if (get_bits1(gb)) { - val = get_bits(gb, 8); - for (i = 0; i < 8; i++, dst += stride) - memset(dst, val, 16); - } else { - if (get_bits_left(gb) < 16 * 8 * 8) - return AVERROR_INVALIDDATA; - for (i = 0; i < 8; i++) { - for (j = 0; j < 16; j++) - dst[j] = get_bits(gb, 8); - dst += stride; - } - } - return 0; - } - - prev_dc = 0; - for (j = 0; j < 2; j++) { - for (k = 0; k < 4; k++) { - if (!(j | k)) { - dc = get_bits(gb, 8); - } else { - dc = get_vlc2(gb, c->dc_vlc.table, 9, 2); - if (dc == -1) - return AVERROR_INVALIDDATA; - if (dc == 0x100) - dc = get_bits(gb, 8); - } - dc = (dc + prev_dc) & 0xFF; - prev_dc = dc; - c->block[0] = dc; - - nc = get_vlc2(gb, c->nc_vlc[vlc_set].table, 9, 1); - if (nc == -1) - return AVERROR_INVALIDDATA; - - bpos = 1; - memset(c->block + 1, 0, 15 * sizeof(*c->block)); - for (l = 0; l < nc; l++) { - ac = get_vlc2(gb, c->ac_vlc[vlc_set].table, 9, 2); - if (ac == -1) - return AVERROR_INVALIDDATA; - if (ac == 0x1000) - ac = get_bits(gb, 12); - bpos += ac & 0xF; - if (bpos >= 16) - return AVERROR_INVALIDDATA; - val = sign_extend(ac >> 4, 8); - c->block[tscc2_zigzag[bpos++]] = val; - } - tscc2_idct4_put(c->block, q, dst + k * 4, stride); - } - dst += 4 * stride; - } - return 0; -} - -static int tscc2_decode_slice(TSCC2Context *c, int mb_y, - const uint8_t *buf, int buf_size) -{ - int i, mb_x, q, ret; - int off; - - init_get_bits(&c->gb, buf, buf_size * 8); - - for (mb_x = 0; mb_x < c->mb_width; mb_x++) { - q = c->slice_quants[mb_x + c->mb_width * mb_y]; - - if (q == 0 || q == 3) // skip block - continue; - for (i = 0; i < 3; i++) { - off = mb_x * 16 + mb_y * 8 * c->pic.linesize[i]; - ret = tscc2_decode_mb(c, c->q[q - 1], c->quant[q - 1] - 2, - c->pic.data[i] + off, c->pic.linesize[i], i); - if (ret) - return ret; - } - } - - return 0; -} - -static int tscc2_decode_frame(AVCodecContext *avctx, void *data, - int *got_frame, AVPacket *avpkt) -{ - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - TSCC2Context *c = avctx->priv_data; - GetByteContext gb; - uint32_t frame_type, size; - int i, val, len, pos = 0; - int num_mb = c->mb_width * c->mb_height; - int ret; - - bytestream2_init(&gb, buf, buf_size); - frame_type = bytestream2_get_byte(&gb); - if (frame_type > 1) { - av_log(avctx, AV_LOG_ERROR, "Incorrect frame type %d\n", frame_type); - return AVERROR_INVALIDDATA; - } - - if ((ret = ff_reget_buffer(avctx, &c->pic)) < 0) - return ret; - - if (frame_type == 0) { - *got_frame = 1; - if ((ret = av_frame_ref(data, &c->pic)) < 0) - return ret; - - return buf_size; - } - - if (bytestream2_get_bytes_left(&gb) < 4) { - av_log(avctx, AV_LOG_ERROR, "Frame is too short\n"); - return AVERROR_INVALIDDATA; - } - - c->quant[0] = bytestream2_get_byte(&gb); - c->quant[1] = bytestream2_get_byte(&gb); - if (c->quant[0] < 2 || c->quant[0] > NUM_VLC_SETS + 1 || - c->quant[1] < 2 || c->quant[1] > NUM_VLC_SETS + 1) { - av_log(avctx, AV_LOG_ERROR, "Invalid quantisers %d / %d\n", - c->quant[0], c->quant[1]); - return AVERROR_INVALIDDATA; - } - - for (i = 0; i < 3; i++) { - c->q[0][i] = tscc2_quants[c->quant[0] - 2][i]; - c->q[1][i] = tscc2_quants[c->quant[1] - 2][i]; - } - - bytestream2_skip(&gb, 1); - - size = bytestream2_get_le32(&gb); - if (size > bytestream2_get_bytes_left(&gb)) { - av_log(avctx, AV_LOG_ERROR, "Slice properties chunk is too large\n"); - return AVERROR_INVALIDDATA; - } - - for (i = 0; i < size; i++) { - val = bytestream2_get_byte(&gb); - len = val & 0x3F; - val >>= 6; - if (pos + len > num_mb) { - av_log(avctx, AV_LOG_ERROR, "Too many slice properties\n"); - return AVERROR_INVALIDDATA; - } - memset(c->slice_quants + pos, val, len); - pos += len; - } - if (pos < num_mb) { - av_log(avctx, AV_LOG_ERROR, "Too few slice properties (%d / %d)\n", - pos, num_mb); - return AVERROR_INVALIDDATA; - } - - for (i = 0; i < c->mb_height; i++) { - size = bytestream2_peek_byte(&gb); - if (size & 1) { - size = bytestream2_get_byte(&gb) - 1; - } else { - size = bytestream2_get_le32(&gb) >> 1; - } - if (!size) { - int skip_row = 1, j, off = i * c->mb_width; - for (j = 0; j < c->mb_width; j++) { - if (c->slice_quants[off + j] == 1 || - c->slice_quants[off + j] == 2) { - skip_row = 0; - break; - } - } - if (!skip_row) { - av_log(avctx, AV_LOG_ERROR, "Non-skip row with zero size\n"); - return AVERROR_INVALIDDATA; - } - } - if (bytestream2_get_bytes_left(&gb) < size) { - av_log(avctx, AV_LOG_ERROR, "Invalid slice size (%d/%d)\n", - size, bytestream2_get_bytes_left(&gb)); - return AVERROR_INVALIDDATA; - } - ret = tscc2_decode_slice(c, i, buf + bytestream2_tell(&gb), size); - if (ret) { - av_log(avctx, AV_LOG_ERROR, "Error decoding slice %d\n", i); - return ret; - } - bytestream2_skip(&gb, size); - } - - *got_frame = 1; - if ((ret = av_frame_ref(data, &c->pic)) < 0) - return ret; - - /* always report that the buffer was completely consumed */ - return buf_size; -} - -static av_cold int tscc2_decode_init(AVCodecContext *avctx) -{ - TSCC2Context * const c = avctx->priv_data; - int ret; - - c->avctx = avctx; - - avctx->pix_fmt = AV_PIX_FMT_YUV444P; - - if ((ret = init_vlcs(c)) < 0) { - av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n"); - return ret; - } - - c->mb_width = FFALIGN(avctx->width, 16) >> 4; - c->mb_height = FFALIGN(avctx->height, 8) >> 3; - c->slice_quants = av_malloc(c->mb_width * c->mb_height); - if (!c->slice_quants) { - av_log(avctx, AV_LOG_ERROR, "Cannot allocate slice information\n"); - free_vlcs(c); - return AVERROR(ENOMEM); - } - - return 0; -} - -static av_cold int tscc2_decode_end(AVCodecContext *avctx) -{ - TSCC2Context * const c = avctx->priv_data; - - av_frame_unref(&c->pic); - av_freep(&c->slice_quants); - free_vlcs(c); - - return 0; -} - -AVCodec ff_tscc2_decoder = { - .name = "tscc2", - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_TSCC2, - .priv_data_size = sizeof(TSCC2Context), - .init = tscc2_decode_init, - .close = tscc2_decode_end, - .decode = tscc2_decode_frame, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Codec 2"), -}; -- cgit v1.2.3