/* * Canopus HQX decoder * * 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 */ #include <inttypes.h> #include "libavutil/imgutils.h" #include "libavutil/intreadwrite.h" #include "avcodec.h" #include "canopus.h" #include "get_bits.h" #include "internal.h" #include "thread.h" #include "hqx.h" #include "hqxdsp.h" /* HQX has four modes - 422, 444, 422alpha and 444alpha - all 12-bit */ enum HQXFormat { HQX_422 = 0, HQX_444, HQX_422A, HQX_444A, }; #define HQX_HEADER_SIZE 59 /* macroblock selects a group of 4 possible quants and * a block can use any of those four quantisers * one column is powers of 2, the other one is powers of 2 * 3, * then there is the special one, powers of 2 * 5 */ static const int hqx_quants[16][4] = { { 0x1, 0x2, 0x4, 0x8 }, { 0x1, 0x3, 0x6, 0xC }, { 0x2, 0x4, 0x8, 0x10 }, { 0x3, 0x6, 0xC, 0x18 }, { 0x4, 0x8, 0x10, 0x20 }, { 0x6, 0xC, 0x18, 0x30 }, { 0x8, 0x10, 0x20, 0x40 }, { 0xA, 0x14, 0x28, 0x50 }, { 0xC, 0x18, 0x30, 0x60 }, { 0x10, 0x20, 0x40, 0x80 }, { 0x18, 0x30, 0x60, 0xC0 }, { 0x20, 0x40, 0x80, 0x100 }, { 0x30, 0x60, 0xC0, 0x180 }, { 0x40, 0x80, 0x100, 0x200 }, { 0x60, 0xC0, 0x180, 0x300 }, { 0x80, 0x100, 0x200, 0x400 } }; static const uint8_t hqx_quant_luma[64] = { 16, 16, 16, 19, 19, 19, 42, 44, 16, 16, 19, 19, 19, 38, 43, 45, 16, 19, 19, 19, 40, 41, 45, 48, 19, 19, 19, 40, 41, 42, 46, 49, 19, 19, 40, 41, 42, 43, 48, 101, 19, 38, 41, 42, 43, 44, 98, 104, 42, 43, 45, 46, 48, 98, 109, 116, 44, 45, 48, 49, 101, 104, 116, 123, }; static const uint8_t hqx_quant_chroma[64] = { 16, 16, 19, 25, 26, 26, 42, 44, 16, 19, 25, 25, 26, 38, 43, 91, 19, 25, 26, 27, 40, 41, 91, 96, 25, 25, 27, 40, 41, 84, 93, 197, 26, 26, 40, 41, 84, 86, 191, 203, 26, 38, 41, 84, 86, 177, 197, 209, 42, 43, 91, 93, 191, 197, 219, 232, 44, 91, 96, 197, 203, 209, 232, 246, }; static inline void put_blocks(HQXContext *ctx, int plane, int x, int y, int ilace, int16_t *block0, int16_t *block1, const uint8_t *quant) { int fields = ilace ? 2 : 1; int lsize = ctx->pic->linesize[plane]; uint8_t *p = ctx->pic->data[plane] + x * 2; ctx->hqxdsp.idct_put((uint16_t *)(p + y * lsize), lsize * fields, block0, quant); ctx->hqxdsp.idct_put((uint16_t *)(p + (y + (ilace ? 1 : 8)) * lsize), lsize * fields, block1, quant); } static inline void hqx_get_ac(GetBitContext *gb, const HQXAC *ac, int *run, int *lev) { int val; val = show_bits(gb, ac->lut_bits); if (ac->lut[val].bits == -1) { GetBitContext gb2 = *gb; skip_bits(&gb2, ac->lut_bits); val = ac->lut[val].lev + show_bits(&gb2, ac->extra_bits); } *run = ac->lut[val].run; *lev = ac->lut[val].lev; skip_bits(gb, ac->lut[val].bits); } static int decode_block(GetBitContext *gb, VLC *vlc, const int *quants, int dcb, int16_t block[64], int *last_dc) { int q, dc; int ac_idx; int run, lev, pos = 1; memset(block, 0, 64 * sizeof(*block)); dc = get_vlc2(gb, vlc->table, HQX_DC_VLC_BITS, 2); *last_dc += dc; block[0] = sign_extend(*last_dc << (12 - dcb), 12); q = quants[get_bits(gb, 2)]; if (q >= 128) ac_idx = HQX_AC_Q128; else if (q >= 64) ac_idx = HQX_AC_Q64; else if (q >= 32) ac_idx = HQX_AC_Q32; else if (q >= 16) ac_idx = HQX_AC_Q16; else if (q >= 8) ac_idx = HQX_AC_Q8; else ac_idx = HQX_AC_Q0; do { hqx_get_ac(gb, &ff_hqx_ac[ac_idx], &run, &lev); pos += run; if (pos >= 64) break; block[ff_zigzag_direct[pos++]] = lev * q; } while (pos < 64); return 0; } static int hqx_decode_422(HQXContext *ctx, int slice_no, int x, int y) { HQXSlice *slice = &ctx->slice[slice_no]; GetBitContext *gb = &slice->gb; const int *quants; int flag; int last_dc; int i, ret; if (ctx->interlaced) flag = get_bits1(gb); else flag = 0; quants = hqx_quants[get_bits(gb, 4)]; for (i = 0; i < 8; i++) { int vlc_index = ctx->dcb - 9; if (i == 0 || i == 4 || i == 6) last_dc = 0; ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants, ctx->dcb, slice->block[i], &last_dc); if (ret < 0) return ret; } put_blocks(ctx, 0, x, y, flag, slice->block[0], slice->block[2], hqx_quant_luma); put_blocks(ctx, 0, x + 8, y, flag, slice->block[1], slice->block[3], hqx_quant_luma); put_blocks(ctx, 2, x >> 1, y, flag, slice->block[4], slice->block[5], hqx_quant_chroma); put_blocks(ctx, 1, x >> 1, y, flag, slice->block[6], slice->block[7], hqx_quant_chroma); return 0; } static int hqx_decode_422a(HQXContext *ctx, int slice_no, int x, int y) { HQXSlice *slice = &ctx->slice[slice_no]; GetBitContext *gb = &slice->gb; const int *quants; int flag = 0; int last_dc; int i, ret; int cbp; cbp = get_vlc2(gb, ctx->cbp_vlc.table, HQX_CBP_VLC_BITS, 1); for (i = 0; i < 12; i++) memset(slice->block[i], 0, sizeof(**slice->block) * 64); for (i = 0; i < 12; i++) slice->block[i][0] = -0x800; if (cbp) { if (ctx->interlaced) flag = get_bits1(gb); quants = hqx_quants[get_bits(gb, 4)]; cbp |= cbp << 4; // alpha CBP if (cbp & 0x3) // chroma CBP - top cbp |= 0x500; if (cbp & 0xC) // chroma CBP - bottom cbp |= 0xA00; for (i = 0; i < 12; i++) { if (i == 0 || i == 4 || i == 8 || i == 10) last_dc = 0; if (cbp & (1 << i)) { int vlc_index = ctx->dcb - 9; ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants, ctx->dcb, slice->block[i], &last_dc); if (ret < 0) return ret; } } } put_blocks(ctx, 3, x, y, flag, slice->block[ 0], slice->block[ 2], hqx_quant_luma); put_blocks(ctx, 3, x + 8, y, flag, slice->block[ 1], slice->block[ 3], hqx_quant_luma); put_blocks(ctx, 0, x, y, flag, slice->block[ 4], slice->block[ 6], hqx_quant_luma); put_blocks(ctx, 0, x + 8, y, flag, slice->block[ 5], slice->block[ 7], hqx_quant_luma); put_blocks(ctx, 2, x >> 1, y, flag, slice->block[ 8], slice->block[ 9], hqx_quant_chroma); put_blocks(ctx, 1, x >> 1, y, flag, slice->block[10], slice->block[11], hqx_quant_chroma); return 0; } static int hqx_decode_444(HQXContext *ctx, int slice_no, int x, int y) { HQXSlice *slice = &ctx->slice[slice_no]; GetBitContext *gb = &slice->gb; const int *quants; int flag; int last_dc; int i, ret; if (ctx->interlaced) flag = get_bits1(gb); else flag = 0; quants = hqx_quants[get_bits(gb, 4)]; for (i = 0; i < 12; i++) { int vlc_index = ctx->dcb - 9; if (i == 0 || i == 4 || i == 8) last_dc = 0; ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants, ctx->dcb, slice->block[i], &last_dc); if (ret < 0) return ret; } put_blocks(ctx, 0, x, y, flag, slice->block[0], slice->block[ 2], hqx_quant_luma); put_blocks(ctx, 0, x + 8, y, flag, slice->block[1], slice->block[ 3], hqx_quant_luma); put_blocks(ctx, 2, x, y, flag, slice->block[4], slice->block[ 6], hqx_quant_chroma); put_blocks(ctx, 2, x + 8, y, flag, slice->block[5], slice->block[ 7], hqx_quant_chroma); put_blocks(ctx, 1, x, y, flag, slice->block[8], slice->block[10], hqx_quant_chroma); put_blocks(ctx, 1, x + 8, y, flag, slice->block[9], slice->block[11], hqx_quant_chroma); return 0; } static int hqx_decode_444a(HQXContext *ctx, int slice_no, int x, int y) { HQXSlice *slice = &ctx->slice[slice_no]; GetBitContext *gb = &slice->gb; const int *quants; int flag = 0; int last_dc; int i, ret; int cbp; cbp = get_vlc2(gb, ctx->cbp_vlc.table, HQX_CBP_VLC_BITS, 1); for (i = 0; i < 16; i++) memset(slice->block[i], 0, sizeof(**slice->block) * 64); for (i = 0; i < 16; i++) slice->block[i][0] = -0x800; if (cbp) { if (ctx->interlaced) flag = get_bits1(gb); quants = hqx_quants[get_bits(gb, 4)]; cbp |= cbp << 4; // alpha CBP cbp |= cbp << 8; // chroma CBP for (i = 0; i < 16; i++) { if (i == 0 || i == 4 || i == 8 || i == 12) last_dc = 0; if (cbp & (1 << i)) { int vlc_index = ctx->dcb - 9; ret = decode_block(gb, &ctx->dc_vlc[vlc_index], quants, ctx->dcb, slice->block[i], &last_dc); if (ret < 0) return ret; } } } put_blocks(ctx, 3, x, y, flag, slice->block[ 0], slice->block[ 2], hqx_quant_luma); put_blocks(ctx, 3, x + 8, y, flag, slice->block[ 1], slice->block[ 3], hqx_quant_luma); put_blocks(ctx, 0, x, y, flag, slice->block[ 4], slice->block[ 6], hqx_quant_luma); put_blocks(ctx, 0, x + 8, y, flag, slice->block[ 5], slice->block[ 7], hqx_quant_luma); put_blocks(ctx, 2, x, y, flag, slice->block[ 8], slice->block[10], hqx_quant_chroma); put_blocks(ctx, 2, x + 8, y, flag, slice->block[ 9], slice->block[11], hqx_quant_chroma); put_blocks(ctx, 1, x, y, flag, slice->block[12], slice->block[14], hqx_quant_chroma); put_blocks(ctx, 1, x + 8, y, flag, slice->block[13], slice->block[15], hqx_quant_chroma); return 0; } static const int shuffle_16[16] = { 0, 5, 11, 14, 2, 7, 9, 13, 1, 4, 10, 15, 3, 6, 8, 12 }; static int decode_slice(HQXContext *ctx, int slice_no) { int mb_w = (ctx->width + 15) >> 4; int mb_h = (ctx->height + 15) >> 4; int grp_w = (mb_w + 4) / 5; int grp_h = (mb_h + 4) / 5; int grp_h_edge = grp_w * (mb_w / grp_w); int grp_v_edge = grp_h * (mb_h / grp_h); int grp_v_rest = mb_w - grp_h_edge; int grp_h_rest = mb_h - grp_v_edge; int num_mbs = mb_w * mb_h; int num_tiles = (num_mbs + 479) / 480; int std_tile_blocks = num_mbs / (16 * num_tiles); int g_tile = slice_no * num_tiles; int blk_addr, loc_addr, mb_x, mb_y, pos, loc_row, i; int tile_blocks, tile_limit, tile_no; for (tile_no = 0; tile_no < num_tiles; tile_no++, g_tile++) { tile_blocks = std_tile_blocks; tile_limit = -1; if (g_tile < num_mbs - std_tile_blocks * 16 * num_tiles) { tile_limit = num_mbs / (16 * num_tiles); tile_blocks++; } for (i = 0; i < tile_blocks; i++) { if (i == tile_limit) blk_addr = g_tile + 16 * num_tiles * i; else blk_addr = tile_no + 16 * num_tiles * i + num_tiles * shuffle_16[(i + slice_no) & 0xF]; loc_row = grp_h * (blk_addr / (grp_h * mb_w)); loc_addr = blk_addr % (grp_h * mb_w); if (loc_row >= grp_v_edge) { mb_x = grp_w * (loc_addr / (grp_h_rest * grp_w)); pos = loc_addr % (grp_h_rest * grp_w); } else { mb_x = grp_w * (loc_addr / (grp_h * grp_w)); pos = loc_addr % (grp_h * grp_w); } if (mb_x >= grp_h_edge) { mb_x += pos % grp_v_rest; mb_y = loc_row + (pos / grp_v_rest); } else { mb_x += pos % grp_w; mb_y = loc_row + (pos / grp_w); } ctx->decode_func(ctx, slice_no, mb_x * 16, mb_y * 16); } } return 0; } static int decode_slice_thread(AVCodecContext *avctx, void *arg, int slice_no, int threadnr) { HQXContext *ctx = avctx->priv_data; uint32_t *slice_off = ctx->slice_off; int ret; if (slice_off[slice_no] < HQX_HEADER_SIZE || slice_off[slice_no] >= slice_off[slice_no + 1] || slice_off[slice_no + 1] > ctx->data_size) { av_log(avctx, AV_LOG_ERROR, "Invalid slice size %d.\n", ctx->data_size); return AVERROR_INVALIDDATA; } ret = init_get_bits8(&ctx->slice[slice_no].gb, ctx->src + slice_off[slice_no], slice_off[slice_no + 1] - slice_off[slice_no]); if (ret < 0) return ret; return decode_slice(ctx, slice_no); } static int hqx_decode_frame(AVCodecContext *avctx, void *data, int *got_picture_ptr, AVPacket *avpkt) { HQXContext *ctx = avctx->priv_data; ThreadFrame frame = { .f = data }; uint8_t *src = avpkt->data; uint32_t info_tag; int data_start; int i, ret; if (avpkt->size < 4 + 4) { av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size); return AVERROR_INVALIDDATA; } info_tag = AV_RL32(src); if (info_tag == MKTAG('I', 'N', 'F', 'O')) { uint32_t info_offset = AV_RL32(src + 4); if (info_offset > INT_MAX || info_offset + 8 > avpkt->size) { av_log(avctx, AV_LOG_ERROR, "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n", info_offset); return AVERROR_INVALIDDATA; } ff_canopus_parse_info_tag(avctx, src + 8, info_offset); info_offset += 8; src += info_offset; } data_start = src - avpkt->data; ctx->data_size = avpkt->size - data_start; ctx->src = src; ctx->pic = data; if (ctx->data_size < HQX_HEADER_SIZE) { av_log(avctx, AV_LOG_ERROR, "Frame too small.\n"); return AVERROR_INVALIDDATA; } if (src[0] != 'H' || src[1] != 'Q') { av_log(avctx, AV_LOG_ERROR, "Not an HQX frame.\n"); return AVERROR_INVALIDDATA; } ctx->interlaced = !(src[2] & 0x80); ctx->format = src[2] & 7; ctx->dcb = (src[3] & 3) + 8; ctx->width = AV_RB16(src + 4); ctx->height = AV_RB16(src + 6); for (i = 0; i < 17; i++) ctx->slice_off[i] = AV_RB24(src + 8 + i * 3); if (ctx->dcb == 8) { av_log(avctx, AV_LOG_ERROR, "Invalid DC precision %d.\n", ctx->dcb); return AVERROR_INVALIDDATA; } ret = av_image_check_size(ctx->width, ctx->height, 0, avctx); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "Invalid stored dimensions %dx%d.\n", ctx->width, ctx->height); return AVERROR_INVALIDDATA; } avctx->coded_width = FFALIGN(ctx->width, 16); avctx->coded_height = FFALIGN(ctx->height, 16); avctx->width = ctx->width; avctx->height = ctx->height; avctx->bits_per_raw_sample = 10; //The minimum size is 2bit per macroblock // hqx_decode_422 & hqx_decode_444 have a unconditionally stored 4bits hqx_quants index // hqx_decode_422a & hqx_decode_444a use cbp_vlc which has a minimum length of 2 bits for its VLCs // The code rejects slices overlapping in their input data if (avctx->coded_width / 16 * (avctx->coded_height / 16) * (100 - avctx->discard_damaged_percentage) / 100 > 4LL * avpkt->size) return AVERROR_INVALIDDATA; switch (ctx->format) { case HQX_422: avctx->pix_fmt = AV_PIX_FMT_YUV422P16; ctx->decode_func = hqx_decode_422; break; case HQX_444: avctx->pix_fmt = AV_PIX_FMT_YUV444P16; ctx->decode_func = hqx_decode_444; break; case HQX_422A: avctx->pix_fmt = AV_PIX_FMT_YUVA422P16; ctx->decode_func = hqx_decode_422a; break; case HQX_444A: avctx->pix_fmt = AV_PIX_FMT_YUVA444P16; ctx->decode_func = hqx_decode_444a; break; default: av_log(avctx, AV_LOG_ERROR, "Invalid format: %d.\n", ctx->format); return AVERROR_INVALIDDATA; } ret = ff_thread_get_buffer(avctx, &frame, 0); if (ret < 0) return ret; avctx->execute2(avctx, decode_slice_thread, NULL, NULL, 16); ctx->pic->key_frame = 1; ctx->pic->pict_type = AV_PICTURE_TYPE_I; *got_picture_ptr = 1; return avpkt->size; } static av_cold int hqx_decode_close(AVCodecContext *avctx) { int i; HQXContext *ctx = avctx->priv_data; ff_free_vlc(&ctx->cbp_vlc); for (i = 0; i < 3; i++) { ff_free_vlc(&ctx->dc_vlc[i]); } return 0; } static av_cold int hqx_decode_init(AVCodecContext *avctx) { HQXContext *ctx = avctx->priv_data; ff_hqxdsp_init(&ctx->hqxdsp); return ff_hqx_init_vlcs(ctx); } const AVCodec ff_hqx_decoder = { .name = "hqx", .long_name = NULL_IF_CONFIG_SMALL("Canopus HQX"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_HQX, .priv_data_size = sizeof(HQXContext), .init = hqx_decode_init, .decode = hqx_decode_frame, .close = hqx_decode_close, .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS, .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, };