From 35c6ce76b107225a19eb33aea38857d2405882af Mon Sep 17 00:00:00 2001 From: Vittorio Giovara Date: Sun, 22 Feb 2015 18:38:31 +0000 Subject: Canopus HQX decoder Based on work by Kostya Shishkov . --- libavcodec/hqx.c | 645 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 645 insertions(+) create mode 100644 libavcodec/hqx.c (limited to 'libavcodec/hqx.c') diff --git a/libavcodec/hqx.c b/libavcodec/hqx.c new file mode 100644 index 0000000000..3feb2871d3 --- /dev/null +++ b/libavcodec/hqx.c @@ -0,0 +1,645 @@ +/* + * Canopus HQX decoder + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include + +#include "libavutil/imgutils.h" +#include "libavutil/intreadwrite.h" + +#include "avcodec.h" +#include "get_bits.h" +#include "internal.h" + +#include "hqx.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 + +typedef int (*mb_decode_func)(HQXContext *ctx, AVFrame *pic, + GetBitContext *gb, int x, int y); + +/* 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 idct_col(int16_t *blk, const uint8_t *quant) +{ + int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF; + int t10, t11, t12, t13; + int s0, s1, s2, s3, s4, s5, s6, s7; + + s0 = (int) blk[0 * 8] * quant[0 * 8]; + s1 = (int) blk[1 * 8] * quant[1 * 8]; + s2 = (int) blk[2 * 8] * quant[2 * 8]; + s3 = (int) blk[3 * 8] * quant[3 * 8]; + s4 = (int) blk[4 * 8] * quant[4 * 8]; + s5 = (int) blk[5 * 8] * quant[5 * 8]; + s6 = (int) blk[6 * 8] * quant[6 * 8]; + s7 = (int) blk[7 * 8] * quant[7 * 8]; + + t0 = (s3 * 19266 + s5 * 12873) >> 15; + t1 = (s5 * 19266 - s3 * 12873) >> 15; + t2 = ((s7 * 4520 + s1 * 22725) >> 15) - t0; + t3 = ((s1 * 4520 - s7 * 22725) >> 15) - t1; + t4 = t0 * 2 + t2; + t5 = t1 * 2 + t3; + t6 = t2 - t3; + t7 = t3 * 2 + t6; + t8 = (t6 * 11585) >> 14; + t9 = (t7 * 11585) >> 14; + tA = (s2 * 8867 - s6 * 21407) >> 14; + tB = (s6 * 8867 + s2 * 21407) >> 14; + tC = (s0 >> 1) - (s4 >> 1); + tD = (s4 >> 1) * 2 + tC; + tE = tC - (tA >> 1); + tF = tD - (tB >> 1); + t10 = tF - t5; + t11 = tE - t8; + t12 = tE + (tA >> 1) * 2 - t9; + t13 = tF + (tB >> 1) * 2 - t4; + + blk[0 * 8] = t13 + t4 * 2; + blk[1 * 8] = t12 + t9 * 2; + blk[2 * 8] = t11 + t8 * 2; + blk[3 * 8] = t10 + t5 * 2; + blk[4 * 8] = t10; + blk[5 * 8] = t11; + blk[6 * 8] = t12; + blk[7 * 8] = t13; +} + +static inline void idct_row(int16_t *blk) +{ + int t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, tA, tB, tC, tD, tE, tF; + int t10, t11, t12, t13; + + t0 = (blk[3] * 19266 + blk[5] * 12873) >> 14; + t1 = (blk[5] * 19266 - blk[3] * 12873) >> 14; + t2 = ((blk[7] * 4520 + blk[1] * 22725) >> 14) - t0; + t3 = ((blk[1] * 4520 - blk[7] * 22725) >> 14) - t1; + t4 = t0 * 2 + t2; + t5 = t1 * 2 + t3; + t6 = t2 - t3; + t7 = t3 * 2 + t6; + t8 = (t6 * 11585) >> 14; + t9 = (t7 * 11585) >> 14; + tA = (blk[2] * 8867 - blk[6] * 21407) >> 14; + tB = (blk[6] * 8867 + blk[2] * 21407) >> 14; + tC = blk[0] - blk[4]; + tD = blk[4] * 2 + tC; + tE = tC - tA; + tF = tD - tB; + t10 = tF - t5; + t11 = tE - t8; + t12 = tE + tA * 2 - t9; + t13 = tF + tB * 2 - t4; + + blk[0] = (t13 + t4 * 2 + 4) >> 3; + blk[1] = (t12 + t9 * 2 + 4) >> 3; + blk[2] = (t11 + t8 * 2 + 4) >> 3; + blk[3] = (t10 + t5 * 2 + 4) >> 3; + blk[4] = (t10 + 4) >> 3; + blk[5] = (t11 + 4) >> 3; + blk[6] = (t12 + 4) >> 3; + blk[7] = (t13 + 4) >> 3; +} + +static void hqx_idct(int16_t *block, const uint8_t *quant) +{ + int i; + + for (i = 0; i < 8; i++) + idct_col(block + i, quant + i); + for (i = 0; i < 8; i++) + idct_row(block + i * 8); +} + +static void hqx_idct_put(uint16_t *dst, ptrdiff_t stride, + int16_t *block, const uint8_t *quant) +{ + int i, j; + + hqx_idct(block, quant); + + for (i = 0; i < 8; i++) { + for (j = 0; j < 8; j++) { + int v = av_clip(block[j + i * 8] + 0x800, 0, 0x1000); + dst[j] = (v << 4) | (v >> 8); + } + dst += stride >> 1; + } +} + +static inline void put_blocks(AVFrame *pic, 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 = pic->linesize[plane]; + uint8_t *p = pic->data[plane] + x * 2; + + hqx_idct_put((uint16_t *)(p + y * lsize), lsize * fields, block0, quant); + hqx_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); + if (dc < 0) + return AVERROR_INVALIDDATA; + *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, AVFrame *pic, + GetBitContext *gb, int x, int y) +{ + 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, ctx->block[i], &last_dc); + if (ret < 0) + return ret; + } + + put_blocks(pic, 0, x, y, flag, ctx->block[0], ctx->block[2], hqx_quant_luma); + put_blocks(pic, 0, x + 8, y, flag, ctx->block[1], ctx->block[3], hqx_quant_luma); + put_blocks(pic, 2, x >> 1, y, flag, ctx->block[4], ctx->block[5], hqx_quant_chroma); + put_blocks(pic, 1, x >> 1, y, flag, ctx->block[6], ctx->block[7], hqx_quant_chroma); + + return 0; +} + +static int hqx_decode_422a(HQXContext *ctx, AVFrame *pic, + GetBitContext *gb, int x, int y) +{ + const int *quants; + int flag = 0; + int last_dc; + int i, ret; + int cbp; + + cbp = get_vlc2(gb, ctx->cbp_vlc.table, ctx->cbp_vlc.bits, 1); + + for (i = 0; i < 12; i++) + memset(ctx->block[i], 0, sizeof(**ctx->block) * 64); + for (i = 0; i < 12; i++) + ctx->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, ctx->block[i], &last_dc); + if (ret < 0) + return ret; + } + } + } + + put_blocks(pic, 3, x, y, flag, ctx->block[ 0], ctx->block[ 2], hqx_quant_luma); + put_blocks(pic, 3, x + 8, y, flag, ctx->block[ 1], ctx->block[ 3], hqx_quant_luma); + put_blocks(pic, 0, x, y, flag, ctx->block[ 4], ctx->block[ 6], hqx_quant_luma); + put_blocks(pic, 0, x + 8, y, flag, ctx->block[ 5], ctx->block[ 7], hqx_quant_luma); + put_blocks(pic, 2, x >> 1, y, flag, ctx->block[ 8], ctx->block[ 9], hqx_quant_chroma); + put_blocks(pic, 1, x >> 1, y, flag, ctx->block[10], ctx->block[11], hqx_quant_chroma); + + return 0; +} + +static int hqx_decode_444(HQXContext *ctx, AVFrame *pic, + GetBitContext *gb, int x, int y) +{ + 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, ctx->block[i], &last_dc); + if (ret < 0) + return ret; + } + + put_blocks(pic, 0, x, y, flag, ctx->block[0], ctx->block[ 2], hqx_quant_luma); + put_blocks(pic, 0, x + 8, y, flag, ctx->block[1], ctx->block[ 3], hqx_quant_luma); + put_blocks(pic, 2, x, y, flag, ctx->block[4], ctx->block[ 6], hqx_quant_chroma); + put_blocks(pic, 2, x + 8, y, flag, ctx->block[5], ctx->block[ 7], hqx_quant_chroma); + put_blocks(pic, 1, x, y, flag, ctx->block[8], ctx->block[10], hqx_quant_chroma); + put_blocks(pic, 1, x + 8, y, flag, ctx->block[9], ctx->block[11], hqx_quant_chroma); + + return 0; +} + +static int hqx_decode_444a(HQXContext *ctx, AVFrame *pic, + GetBitContext *gb, int x, int y) +{ + const int *quants; + int flag = 0; + int last_dc; + int i, ret; + int cbp; + + cbp = get_vlc2(gb, ctx->cbp_vlc.table, ctx->cbp_vlc.bits, 1); + + for (i = 0; i < 16; i++) + memset(ctx->block[i], 0, sizeof(**ctx->block) * 64); + for (i = 0; i < 16; i++) + ctx->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, ctx->block[i], &last_dc); + if (ret < 0) + return ret; + } + } + } + + put_blocks(pic, 3, x, y, flag, ctx->block[ 0], ctx->block[ 2], hqx_quant_luma); + put_blocks(pic, 3, x + 8, y, flag, ctx->block[ 1], ctx->block[ 3], hqx_quant_luma); + put_blocks(pic, 0, x, y, flag, ctx->block[ 4], ctx->block[ 6], hqx_quant_luma); + put_blocks(pic, 0, x + 8, y, flag, ctx->block[ 5], ctx->block[ 7], hqx_quant_luma); + put_blocks(pic, 2, x, y, flag, ctx->block[ 8], ctx->block[10], hqx_quant_chroma); + put_blocks(pic, 2, x + 8, y, flag, ctx->block[ 9], ctx->block[11], hqx_quant_chroma); + put_blocks(pic, 1, x, y, flag, ctx->block[12], ctx->block[14], hqx_quant_chroma); + put_blocks(pic, 1, x + 8, y, flag, ctx->block[13], ctx->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, AVFrame *pic, GetBitContext *gb, + int slice_no, mb_decode_func decode_func) +{ + 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); + } + decode_func(ctx, pic, gb, mb_x * 16, mb_y * 16); + } + } + + return 0; +} + +static int hqx_decode_frame(AVCodecContext *avctx, void *data, + int *got_picture_ptr, AVPacket *avpkt) +{ + HQXContext *ctx = avctx->priv_data; + AVFrame *pic = data; + uint8_t *src = avpkt->data; + uint32_t info_tag, info_offset; + int data_start; + unsigned data_size; + GetBitContext gb; + int i, ret; + int slice; + uint32_t slice_off[17]; + mb_decode_func decode_func = 0; + + if (avpkt->size < 8) + return AVERROR_INVALIDDATA; + + /* Skip the INFO header if present */ + info_offset = 0; + info_tag = AV_RL32(src); + if (info_tag == MKTAG('I', 'N', 'F', 'O')) { + info_offset = AV_RL32(src + 4); + if (info_offset > UINT32_MAX - 8 || 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; + } + + info_offset += 8; + src += info_offset; + + av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n"); + } + + data_start = src - avpkt->data; + data_size = avpkt->size - data_start; + + if (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++) + 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 dimenstions %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; + + switch (ctx->format) { + case HQX_422: + avctx->pix_fmt = AV_PIX_FMT_YUV422P16; + decode_func = hqx_decode_422; + break; + case HQX_444: + avctx->pix_fmt = AV_PIX_FMT_YUV444P16; + decode_func = hqx_decode_444; + break; + case HQX_422A: + avctx->pix_fmt = AV_PIX_FMT_YUVA422P16; + decode_func = hqx_decode_422a; + break; + case HQX_444A: + avctx->pix_fmt = AV_PIX_FMT_YUVA444P16; + decode_func = hqx_decode_444a; + break; + } + if (!decode_func) { + av_log(avctx, AV_LOG_ERROR, "Invalid format: %d.\n", ctx->format); + return AVERROR_INVALIDDATA; + } + + ret = ff_get_buffer(avctx, pic, 0); + if (ret < 0) { + av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); + return ret; + } + + for (slice = 0; slice < 16; slice++) { + if (slice_off[slice] < HQX_HEADER_SIZE || + slice_off[slice] >= slice_off[slice + 1] || + slice_off[slice + 1] > data_size) { + av_log(avctx, AV_LOG_ERROR, "Invalid slice size.\n"); + break; + } + ret = init_get_bits(&gb, src + slice_off[slice], + (slice_off[slice + 1] - slice_off[slice]) * 8); + if (ret < 0) + return ret; + ret = decode_slice(ctx, pic, &gb, slice, decode_func); + if (ret < 0) { + av_log(avctx, AV_LOG_ERROR, "Error decoding slice %d.\n", slice); + } + } + + pic->key_frame = 1; + 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; + int ret = ff_hqx_init_vlcs(ctx); + if (ret < 0) + hqx_decode_close(avctx); + return ret; +} + +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 = CODEC_CAP_DR1, +}; -- cgit v1.2.3