| /* |
| * ClearVideo 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 |
| * ClearVideo decoder |
| */ |
| |
| #include "avcodec.h" |
| #include "idctdsp.h" |
| #include "internal.h" |
| #include "get_bits.h" |
| #include "bytestream.h" |
| |
| #define NUM_DC_CODES 127 |
| #define NUM_AC_CODES 103 |
| |
| static const uint8_t clv_dc_codes[NUM_DC_CODES] = { |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
| 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, |
| 0x10, 0x11, 0x12, 0x13, 0x13, 0x14, 0x07, 0x0B, |
| 0x0C, 0x08, 0x08, 0x09, 0x04, 0x06, 0x07, 0x05, |
| 0x04, 0x05, 0x04, 0x06, 0x05, 0x06, 0x07, 0x05, |
| 0x06, 0x07, 0x06, 0x07, 0x08, 0x06, 0x07, 0x08, |
| 0x09, 0x0A, 0x0B, 0x07, 0x08, 0x09, 0x07, 0x08, |
| 0x06, 0x07, 0x08, 0x06, 0x04, 0x05, 0x02, 0x01, |
| 0x03, 0x06, 0x07, 0x07, 0x09, 0x0A, 0x0B, 0x09, |
| 0x0A, 0x0B, 0x0A, 0x0B, 0x0C, 0x0D, 0x0C, 0x09, |
| 0x0D, 0x0A, 0x0B, 0x08, 0x09, 0x0A, 0x0B, 0x07, |
| 0x08, 0x09, 0x0A, 0x0B, 0x06, 0x07, 0x06, 0x08, |
| 0x07, 0x09, 0x0A, 0x0B, 0x09, 0x0A, 0x0B, 0x0C, |
| 0x14, 0x0D, 0x0D, 0x0E, 0x0F, 0x15, 0x15, 0x16, |
| 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, |
| 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, |
| }; |
| |
| static const uint8_t clv_dc_bits[NUM_DC_CODES] = { |
| 22, 22, 22, 22, 22, 22, 22, 22, |
| 22, 22, 22, 22, 22, 22, 22, 22, |
| 22, 22, 22, 21, 22, 22, 19, 20, |
| 20, 19, 18, 18, 15, 17, 17, 16, |
| 14, 15, 12, 13, 14, 14, 14, 12, |
| 12, 12, 11, 11, 11, 10, 10, 10, |
| 10, 10, 10, 9, 9, 9, 8, 8, |
| 7, 7, 7, 6, 5, 5, 3, 1, |
| 3, 5, 5, 6, 7, 7, 7, 8, |
| 8, 8, 9, 9, 9, 9, 10, 11, |
| 10, 11, 11, 12, 12, 12, 12, 13, |
| 14, 14, 14, 14, 15, 15, 16, 17, |
| 16, 17, 18, 18, 19, 19, 19, 19, |
| 21, 19, 20, 19, 19, 21, 22, 22, |
| 22, 22, 22, 22, 22, 22, 22, 22, |
| 22, 22, 22, 22, 22, 22, 22, |
| }; |
| |
| static const uint16_t clv_ac_syms[NUM_AC_CODES] = { |
| 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, |
| 0x0009, 0x000A, 0x000B, 0x000C, 0x0011, 0x0012, 0x0013, 0x0014, |
| 0x0015, 0x0016, 0x0021, 0x0022, 0x0023, 0x0024, 0x0031, 0x0032, |
| 0x0033, 0x0041, 0x0042, 0x0043, 0x0051, 0x0052, 0x0053, 0x0061, |
| 0x0062, 0x0063, 0x0071, 0x0072, 0x0081, 0x0082, 0x0091, 0x0092, |
| 0x00A1, 0x00A2, 0x00B1, 0x00C1, 0x00D1, 0x00E1, 0x00F1, 0x0101, |
| 0x0111, 0x0121, 0x0131, 0x0141, 0x0151, 0x0161, 0x0171, 0x0181, |
| 0x0191, 0x01A1, 0x1001, 0x1002, 0x1003, 0x1011, 0x1012, 0x1021, |
| 0x1031, 0x1041, 0x1051, 0x1061, 0x1071, 0x1081, 0x1091, 0x10A1, |
| 0x10B1, 0x10C1, 0x10D1, 0x10E1, 0x10F1, 0x1101, 0x1111, 0x1121, |
| 0x1131, 0x1141, 0x1151, 0x1161, 0x1171, 0x1181, 0x1191, 0x11A1, |
| 0x11B1, 0x11C1, 0x11D1, 0x11E1, 0x11F1, 0x1201, 0x1211, 0x1221, |
| 0x1231, 0x1241, 0x1251, 0x1261, 0x1271, 0x1281, 0x1BFF, |
| }; |
| |
| static const uint8_t clv_ac_codes[NUM_AC_CODES] = { |
| 0x02, 0x0F, 0x15, 0x17, 0x1F, 0x25, 0x24, 0x21, |
| 0x20, 0x07, 0x06, 0x20, 0x06, 0x14, 0x1E, 0x0F, |
| 0x21, 0x50, 0x0E, 0x1D, 0x0E, 0x51, 0x0D, 0x23, |
| 0x0D, 0x0C, 0x22, 0x52, 0x0B, 0x0C, 0x53, 0x13, |
| 0x0B, 0x54, 0x12, 0x0A, 0x11, 0x09, 0x10, 0x08, |
| 0x16, 0x55, 0x15, 0x14, 0x1C, 0x1B, 0x21, 0x20, |
| 0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x22, 0x23, |
| 0x56, 0x57, 0x07, 0x19, 0x05, 0x0F, 0x04, 0x0E, |
| 0x0D, 0x0C, 0x13, 0x12, 0x11, 0x10, 0x1A, 0x19, |
| 0x18, 0x17, 0x16, 0x15, 0x14, 0x13, 0x18, 0x17, |
| 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x07, 0x06, |
| 0x05, 0x04, 0x24, 0x25, 0x26, 0x27, 0x58, 0x59, |
| 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x03, |
| }; |
| |
| static const uint8_t clv_ac_bits[NUM_AC_CODES] = { |
| 2, 4, 6, 7, 8, 9, 9, 10, |
| 10, 11, 11, 11, 3, 6, 8, 10, |
| 11, 12, 4, 8, 10, 12, 5, 9, |
| 10, 5, 9, 12, 5, 10, 12, 6, |
| 10, 12, 6, 10, 6, 10, 6, 10, |
| 7, 12, 7, 7, 8, 8, 9, 9, |
| 9, 9, 9, 9, 9, 9, 11, 11, |
| 12, 12, 4, 9, 11, 6, 11, 6, |
| 6, 6, 7, 7, 7, 7, 8, 8, |
| 8, 8, 8, 8, 8, 8, 9, 9, |
| 9, 9, 9, 9, 9, 9, 10, 10, |
| 10, 10, 11, 11, 11, 11, 12, 12, |
| 12, 12, 12, 12, 12, 12, 7, |
| }; |
| |
| typedef struct CLVContext { |
| AVCodecContext *avctx; |
| IDCTDSPContext idsp; |
| AVFrame *pic; |
| GetBitContext gb; |
| int mb_width, mb_height; |
| VLC dc_vlc, ac_vlc; |
| int luma_dc_quant, chroma_dc_quant, ac_quant; |
| DECLARE_ALIGNED(16, int16_t, block)[64]; |
| int top_dc[3], left_dc[4]; |
| } CLVContext; |
| |
| static inline int decode_block(CLVContext *ctx, int16_t *blk, int has_ac, |
| int ac_quant) |
| { |
| GetBitContext *gb = &ctx->gb; |
| int idx = 1, last = 0, val, skip; |
| |
| memset(blk, 0, sizeof(*blk) * 64); |
| blk[0] = get_vlc2(gb, ctx->dc_vlc.table, 9, 3); |
| if (blk[0] < 0) |
| return AVERROR_INVALIDDATA; |
| blk[0] -= 63; |
| |
| if (!has_ac) |
| return 0; |
| |
| while (idx < 64 && !last) { |
| val = get_vlc2(gb, ctx->ac_vlc.table, 9, 2); |
| if (val < 0) |
| return AVERROR_INVALIDDATA; |
| if (val != 0x1BFF) { |
| last = val >> 12; |
| skip = (val >> 4) & 0xFF; |
| val &= 0xF; |
| if (get_bits1(gb)) |
| val = -val; |
| } else { |
| last = get_bits1(gb); |
| skip = get_bits(gb, 6); |
| val = get_sbits(gb, 8); |
| } |
| if (val) { |
| int aval = FFABS(val), sign = val < 0; |
| val = ac_quant * (2 * aval + 1); |
| if (!(ac_quant & 1)) |
| val--; |
| if (sign) |
| val = -val; |
| } |
| idx += skip; |
| if (idx >= 64) |
| return AVERROR_INVALIDDATA; |
| blk[ff_zigzag_direct[idx++]] = val; |
| } |
| |
| return (idx <= 64 && last) ? 0 : -1; |
| } |
| |
| #define DCT_TEMPLATE(blk, step, bias, shift, dshift, OP) \ |
| const int t0 = OP( 2841 * blk[1 * step] + 565 * blk[7 * step]); \ |
| const int t1 = OP( 565 * blk[1 * step] - 2841 * blk[7 * step]); \ |
| const int t2 = OP( 1609 * blk[5 * step] + 2408 * blk[3 * step]); \ |
| const int t3 = OP( 2408 * blk[5 * step] - 1609 * blk[3 * step]); \ |
| const int t4 = OP( 1108 * blk[2 * step] - 2676 * blk[6 * step]); \ |
| const int t5 = OP( 2676 * blk[2 * step] + 1108 * blk[6 * step]); \ |
| const int t6 = ((blk[0 * step] + blk[4 * step]) * (1 << dshift)) + bias; \ |
| const int t7 = ((blk[0 * step] - blk[4 * step]) * (1 << dshift)) + bias; \ |
| const int t8 = t0 + t2; \ |
| const int t9 = t0 - t2; \ |
| const int tA = (int)(181U * (t9 + (t1 - t3)) + 0x80) >> 8; \ |
| const int tB = (int)(181U * (t9 - (t1 - t3)) + 0x80) >> 8; \ |
| const int tC = t1 + t3; \ |
| \ |
| blk[0 * step] = (t6 + t5 + t8) >> shift; \ |
| blk[1 * step] = (t7 + t4 + tA) >> shift; \ |
| blk[2 * step] = (t7 - t4 + tB) >> shift; \ |
| blk[3 * step] = (t6 - t5 + tC) >> shift; \ |
| blk[4 * step] = (t6 - t5 - tC) >> shift; \ |
| blk[5 * step] = (t7 - t4 - tB) >> shift; \ |
| blk[6 * step] = (t7 + t4 - tA) >> shift; \ |
| blk[7 * step] = (t6 + t5 - t8) >> shift; \ |
| |
| #define ROP(x) x |
| #define COP(x) (((x) + 4) >> 3) |
| |
| static void clv_dct(int16_t *block) |
| { |
| int i; |
| int16_t *ptr; |
| |
| ptr = block; |
| for (i = 0; i < 8; i++) { |
| DCT_TEMPLATE(ptr, 1, 0x80, 8, 11, ROP); |
| ptr += 8; |
| } |
| |
| ptr = block; |
| for (i = 0; i < 8; i++) { |
| DCT_TEMPLATE(ptr, 8, 0x2000, 14, 8, COP); |
| ptr++; |
| } |
| } |
| |
| static int decode_mb(CLVContext *c, int x, int y) |
| { |
| int i; |
| int has_ac[6]; |
| int off; |
| |
| for (i = 0; i < 6; i++) |
| has_ac[i] = get_bits1(&c->gb); |
| |
| off = x * 16 + y * 16 * c->pic->linesize[0]; |
| for (i = 0; i < 4; i++) { |
| if (decode_block(c, c->block, has_ac[i], c->ac_quant) < 0) |
| return AVERROR_INVALIDDATA; |
| if (!x && !(i & 1)) { |
| c->block[0] += c->top_dc[0]; |
| c->top_dc[0] = c->block[0]; |
| } else { |
| c->block[0] += c->left_dc[(i & 2) >> 1]; |
| } |
| c->left_dc[(i & 2) >> 1] = c->block[0]; |
| c->block[0] *= c->luma_dc_quant; |
| clv_dct(c->block); |
| if (i == 2) |
| off += c->pic->linesize[0] * 8; |
| c->idsp.put_pixels_clamped(c->block, c->pic->data[0] + off + (i & 1) * 8, |
| c->pic->linesize[0]); |
| } |
| |
| off = x * 8 + y * 8 * c->pic->linesize[1]; |
| for (i = 1; i < 3; i++) { |
| if (decode_block(c, c->block, has_ac[i + 3], c->ac_quant) < 0) |
| return AVERROR_INVALIDDATA; |
| if (!x) { |
| c->block[0] += c->top_dc[i]; |
| c->top_dc[i] = c->block[0]; |
| } else { |
| c->block[0] += c->left_dc[i + 1]; |
| } |
| c->left_dc[i + 1] = c->block[0]; |
| c->block[0] *= c->chroma_dc_quant; |
| clv_dct(c->block); |
| c->idsp.put_pixels_clamped(c->block, c->pic->data[i] + off, |
| c->pic->linesize[i]); |
| } |
| |
| return 0; |
| } |
| |
| static int clv_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_frame, AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| CLVContext *c = avctx->priv_data; |
| GetByteContext gb; |
| uint32_t frame_type; |
| int i, j; |
| int ret; |
| int mb_ret = 0; |
| |
| bytestream2_init(&gb, buf, buf_size); |
| if (avctx->codec_tag == MKTAG('C','L','V','1')) { |
| int skip = bytestream2_get_byte(&gb); |
| bytestream2_skip(&gb, (skip + 1) * 8); |
| } |
| |
| frame_type = bytestream2_get_byte(&gb); |
| |
| if (frame_type & 0x2) { |
| if (buf_size < c->mb_width * c->mb_height) { |
| av_log(avctx, AV_LOG_ERROR, "Packet too small\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) |
| return ret; |
| |
| c->pic->key_frame = frame_type & 0x20 ? 1 : 0; |
| c->pic->pict_type = frame_type & 0x20 ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| |
| bytestream2_get_be32(&gb); // frame size; |
| c->ac_quant = bytestream2_get_byte(&gb); |
| c->luma_dc_quant = 32; |
| c->chroma_dc_quant = 32; |
| |
| if ((ret = init_get_bits8(&c->gb, buf + bytestream2_tell(&gb), |
| (buf_size - bytestream2_tell(&gb)))) < 0) |
| return ret; |
| |
| for (i = 0; i < 3; i++) |
| c->top_dc[i] = 32; |
| for (i = 0; i < 4; i++) |
| c->left_dc[i] = 32; |
| |
| for (j = 0; j < c->mb_height; j++) { |
| for (i = 0; i < c->mb_width; i++) { |
| ret = decode_mb(c, i, j); |
| if (ret < 0) |
| mb_ret = ret; |
| } |
| } |
| |
| if ((ret = av_frame_ref(data, c->pic)) < 0) |
| return ret; |
| |
| *got_frame = 1; |
| } else { |
| } |
| |
| return mb_ret < 0 ? mb_ret : buf_size; |
| } |
| |
| static av_cold int clv_decode_init(AVCodecContext *avctx) |
| { |
| CLVContext * const c = avctx->priv_data; |
| int ret; |
| |
| c->avctx = avctx; |
| |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| |
| c->pic = av_frame_alloc(); |
| if (!c->pic) |
| return AVERROR(ENOMEM); |
| |
| c->mb_width = FFALIGN(avctx->width, 16) >> 4; |
| c->mb_height = FFALIGN(avctx->height, 16) >> 4; |
| |
| ff_idctdsp_init(&c->idsp, avctx); |
| ret = init_vlc(&c->dc_vlc, 9, NUM_DC_CODES, |
| clv_dc_bits, 1, 1, |
| clv_dc_codes, 1, 1, 0); |
| if (ret) { |
| av_log(avctx, AV_LOG_ERROR, "Error initialising DC VLC\n"); |
| return ret; |
| } |
| ret = ff_init_vlc_sparse(&c->ac_vlc, 9, NUM_AC_CODES, |
| clv_ac_bits, 1, 1, |
| clv_ac_codes, 1, 1, |
| clv_ac_syms, 2, 2, 0); |
| if (ret) { |
| av_log(avctx, AV_LOG_ERROR, "Error initialising AC VLC\n"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int clv_decode_end(AVCodecContext *avctx) |
| { |
| CLVContext * const c = avctx->priv_data; |
| |
| av_frame_free(&c->pic); |
| |
| ff_free_vlc(&c->dc_vlc); |
| ff_free_vlc(&c->ac_vlc); |
| |
| return 0; |
| } |
| |
| AVCodec ff_clearvideo_decoder = { |
| .name = "clearvideo", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_CLEARVIDEO, |
| .priv_data_size = sizeof(CLVContext), |
| .init = clv_decode_init, |
| .close = clv_decode_end, |
| .decode = clv_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("Iterated Systems ClearVideo"), |
| }; |
