diff options
Diffstat (limited to 'ffmpeg1/libavcodec/mss3.c')
| -rw-r--r-- | ffmpeg1/libavcodec/mss3.c | 866 |
1 files changed, 866 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/mss3.c b/ffmpeg1/libavcodec/mss3.c new file mode 100644 index 0000000..3cc484f --- /dev/null +++ b/ffmpeg1/libavcodec/mss3.c @@ -0,0 +1,866 @@ +/* + * Microsoft Screen 3 (aka Microsoft ATC Screen) 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 + * Microsoft Screen 3 (aka Microsoft ATC Screen) decoder + */ + +#include "avcodec.h" +#include "bytestream.h" +#include "dsputil.h" +#include "internal.h" +#include "mss34dsp.h" + +#define HEADER_SIZE 27 + +#define MODEL2_SCALE 13 +#define MODEL_SCALE 15 +#define MODEL256_SEC_SCALE 9 + +typedef struct Model2 { + int upd_val, till_rescale; + unsigned zero_freq, zero_weight; + unsigned total_freq, total_weight; +} Model2; + +typedef struct Model { + int weights[16], freqs[16]; + int num_syms; + int tot_weight; + int upd_val, max_upd_val, till_rescale; +} Model; + +typedef struct Model256 { + int weights[256], freqs[256]; + int tot_weight; + int secondary[68]; + int sec_size; + int upd_val, max_upd_val, till_rescale; +} Model256; + +#define RAC_BOTTOM 0x01000000 +typedef struct RangeCoder { + const uint8_t *src, *src_end; + + uint32_t range, low; + int got_error; +} RangeCoder; + +enum BlockType { + FILL_BLOCK = 0, + IMAGE_BLOCK, + DCT_BLOCK, + HAAR_BLOCK, + SKIP_BLOCK +}; + +typedef struct BlockTypeContext { + int last_type; + Model bt_model[5]; +} BlockTypeContext; + +typedef struct FillBlockCoder { + int fill_val; + Model coef_model; +} FillBlockCoder; + +typedef struct ImageBlockCoder { + Model256 esc_model, vec_entry_model; + Model vec_size_model; + Model vq_model[125]; +} ImageBlockCoder; + +typedef struct DCTBlockCoder { + int *prev_dc; + int prev_dc_stride; + int prev_dc_height; + int quality; + uint16_t qmat[64]; + Model dc_model; + Model2 sign_model; + Model256 ac_model; +} DCTBlockCoder; + +typedef struct HaarBlockCoder { + int quality, scale; + Model256 coef_model; + Model coef_hi_model; +} HaarBlockCoder; + +typedef struct MSS3Context { + AVCodecContext *avctx; + AVFrame pic; + + int got_error; + RangeCoder coder; + BlockTypeContext btype[3]; + FillBlockCoder fill_coder[3]; + ImageBlockCoder image_coder[3]; + DCTBlockCoder dct_coder[3]; + HaarBlockCoder haar_coder[3]; + + int dctblock[64]; + int hblock[16 * 16]; +} MSS3Context; + + +static void model2_reset(Model2 *m) +{ + m->zero_weight = 1; + m->total_weight = 2; + m->zero_freq = 0x1000; + m->total_freq = 0x2000; + m->upd_val = 4; + m->till_rescale = 4; +} + +static void model2_update(Model2 *m, int bit) +{ + unsigned scale; + + if (!bit) + m->zero_weight++; + m->till_rescale--; + if (m->till_rescale) + return; + + m->total_weight += m->upd_val; + if (m->total_weight > 0x2000) { + m->total_weight = (m->total_weight + 1) >> 1; + m->zero_weight = (m->zero_weight + 1) >> 1; + if (m->total_weight == m->zero_weight) + m->total_weight = m->zero_weight + 1; + } + m->upd_val = m->upd_val * 5 >> 2; + if (m->upd_val > 64) + m->upd_val = 64; + scale = 0x80000000u / m->total_weight; + m->zero_freq = m->zero_weight * scale >> 18; + m->total_freq = m->total_weight * scale >> 18; + m->till_rescale = m->upd_val; +} + +static void model_update(Model *m, int val) +{ + int i, sum = 0; + unsigned scale; + + m->weights[val]++; + m->till_rescale--; + if (m->till_rescale) + return; + m->tot_weight += m->upd_val; + + if (m->tot_weight > 0x8000) { + m->tot_weight = 0; + for (i = 0; i < m->num_syms; i++) { + m->weights[i] = (m->weights[i] + 1) >> 1; + m->tot_weight += m->weights[i]; + } + } + scale = 0x80000000u / m->tot_weight; + for (i = 0; i < m->num_syms; i++) { + m->freqs[i] = sum * scale >> 16; + sum += m->weights[i]; + } + + m->upd_val = m->upd_val * 5 >> 2; + if (m->upd_val > m->max_upd_val) + m->upd_val = m->max_upd_val; + m->till_rescale = m->upd_val; +} + +static void model_reset(Model *m) +{ + int i; + + m->tot_weight = 0; + for (i = 0; i < m->num_syms - 1; i++) + m->weights[i] = 1; + m->weights[m->num_syms - 1] = 0; + + m->upd_val = m->num_syms; + m->till_rescale = 1; + model_update(m, m->num_syms - 1); + m->till_rescale = + m->upd_val = (m->num_syms + 6) >> 1; +} + +static av_cold void model_init(Model *m, int num_syms) +{ + m->num_syms = num_syms; + m->max_upd_val = 8 * num_syms + 48; + + model_reset(m); +} + +static void model256_update(Model256 *m, int val) +{ + int i, sum = 0; + unsigned scale; + int send, sidx = 1; + + m->weights[val]++; + m->till_rescale--; + if (m->till_rescale) + return; + m->tot_weight += m->upd_val; + + if (m->tot_weight > 0x8000) { + m->tot_weight = 0; + for (i = 0; i < 256; i++) { + m->weights[i] = (m->weights[i] + 1) >> 1; + m->tot_weight += m->weights[i]; + } + } + scale = 0x80000000u / m->tot_weight; + m->secondary[0] = 0; + for (i = 0; i < 256; i++) { + m->freqs[i] = sum * scale >> 16; + sum += m->weights[i]; + send = m->freqs[i] >> MODEL256_SEC_SCALE; + while (sidx <= send) + m->secondary[sidx++] = i - 1; + } + while (sidx < m->sec_size) + m->secondary[sidx++] = 255; + + m->upd_val = m->upd_val * 5 >> 2; + if (m->upd_val > m->max_upd_val) + m->upd_val = m->max_upd_val; + m->till_rescale = m->upd_val; +} + +static void model256_reset(Model256 *m) +{ + int i; + + for (i = 0; i < 255; i++) + m->weights[i] = 1; + m->weights[255] = 0; + + m->tot_weight = 0; + m->upd_val = 256; + m->till_rescale = 1; + model256_update(m, 255); + m->till_rescale = + m->upd_val = (256 + 6) >> 1; +} + +static av_cold void model256_init(Model256 *m) +{ + m->max_upd_val = 8 * 256 + 48; + m->sec_size = (1 << 6) + 2; + + model256_reset(m); +} + +static void rac_init(RangeCoder *c, const uint8_t *src, int size) +{ + int i; + + c->src = src; + c->src_end = src + size; + c->low = 0; + for (i = 0; i < FFMIN(size, 4); i++) + c->low = (c->low << 8) | *c->src++; + c->range = 0xFFFFFFFF; + c->got_error = 0; +} + +static void rac_normalise(RangeCoder *c) +{ + for (;;) { + c->range <<= 8; + c->low <<= 8; + if (c->src < c->src_end) { + c->low |= *c->src++; + } else if (!c->low) { + c->got_error = 1; + c->low = 1; + } + if (c->range >= RAC_BOTTOM) + return; + } +} + +static int rac_get_bit(RangeCoder *c) +{ + int bit; + + c->range >>= 1; + + bit = (c->range <= c->low); + if (bit) + c->low -= c->range; + + if (c->range < RAC_BOTTOM) + rac_normalise(c); + + return bit; +} + +static int rac_get_bits(RangeCoder *c, int nbits) +{ + int val; + + c->range >>= nbits; + val = c->low / c->range; + c->low -= c->range * val; + + if (c->range < RAC_BOTTOM) + rac_normalise(c); + + return val; +} + +static int rac_get_model2_sym(RangeCoder *c, Model2 *m) +{ + int bit, helper; + + helper = m->zero_freq * (c->range >> MODEL2_SCALE); + bit = (c->low >= helper); + if (bit) { + c->low -= helper; + c->range -= helper; + } else { + c->range = helper; + } + + if (c->range < RAC_BOTTOM) + rac_normalise(c); + + model2_update(m, bit); + + return bit; +} + +static int rac_get_model_sym(RangeCoder *c, Model *m) +{ + int prob, prob2, helper, val; + int end, end2; + + prob = 0; + prob2 = c->range; + c->range >>= MODEL_SCALE; + val = 0; + end = m->num_syms >> 1; + end2 = m->num_syms; + do { + helper = m->freqs[end] * c->range; + if (helper <= c->low) { + val = end; + prob = helper; + } else { + end2 = end; + prob2 = helper; + } + end = (end2 + val) >> 1; + } while (end != val); + c->low -= prob; + c->range = prob2 - prob; + if (c->range < RAC_BOTTOM) + rac_normalise(c); + + model_update(m, val); + + return val; +} + +static int rac_get_model256_sym(RangeCoder *c, Model256 *m) +{ + int prob, prob2, helper, val; + int start, end; + int ssym; + + prob2 = c->range; + c->range >>= MODEL_SCALE; + + helper = c->low / c->range; + ssym = helper >> MODEL256_SEC_SCALE; + val = m->secondary[ssym]; + + end = start = m->secondary[ssym + 1] + 1; + while (end > val + 1) { + ssym = (end + val) >> 1; + if (m->freqs[ssym] <= helper) { + end = start; + val = ssym; + } else { + end = (end + val) >> 1; + start = ssym; + } + } + prob = m->freqs[val] * c->range; + if (val != 255) + prob2 = m->freqs[val + 1] * c->range; + + c->low -= prob; + c->range = prob2 - prob; + if (c->range < RAC_BOTTOM) + rac_normalise(c); + + model256_update(m, val); + + return val; +} + +static int decode_block_type(RangeCoder *c, BlockTypeContext *bt) +{ + bt->last_type = rac_get_model_sym(c, &bt->bt_model[bt->last_type]); + + return bt->last_type; +} + +static int decode_coeff(RangeCoder *c, Model *m) +{ + int val, sign; + + val = rac_get_model_sym(c, m); + if (val) { + sign = rac_get_bit(c); + if (val > 1) { + val--; + val = (1 << val) + rac_get_bits(c, val); + } + if (!sign) + val = -val; + } + + return val; +} + +static void decode_fill_block(RangeCoder *c, FillBlockCoder *fc, + uint8_t *dst, int stride, int block_size) +{ + int i; + + fc->fill_val += decode_coeff(c, &fc->coef_model); + + for (i = 0; i < block_size; i++, dst += stride) + memset(dst, fc->fill_val, block_size); +} + +static void decode_image_block(RangeCoder *c, ImageBlockCoder *ic, + uint8_t *dst, int stride, int block_size) +{ + int i, j; + int vec_size; + int vec[4]; + int prev_line[16]; + int A, B, C; + + vec_size = rac_get_model_sym(c, &ic->vec_size_model) + 2; + for (i = 0; i < vec_size; i++) + vec[i] = rac_get_model256_sym(c, &ic->vec_entry_model); + for (; i < 4; i++) + vec[i] = 0; + memset(prev_line, 0, sizeof(prev_line)); + + for (j = 0; j < block_size; j++) { + A = 0; + B = 0; + for (i = 0; i < block_size; i++) { + C = B; + B = prev_line[i]; + A = rac_get_model_sym(c, &ic->vq_model[A + B * 5 + C * 25]); + + prev_line[i] = A; + if (A < 4) + dst[i] = vec[A]; + else + dst[i] = rac_get_model256_sym(c, &ic->esc_model); + } + dst += stride; + } +} + +static int decode_dct(RangeCoder *c, DCTBlockCoder *bc, int *block, + int bx, int by) +{ + int skip, val, sign, pos = 1, zz_pos, dc; + int blk_pos = bx + by * bc->prev_dc_stride; + + memset(block, 0, sizeof(*block) * 64); + + dc = decode_coeff(c, &bc->dc_model); + if (by) { + if (bx) { + int l, tl, t; + + l = bc->prev_dc[blk_pos - 1]; + tl = bc->prev_dc[blk_pos - 1 - bc->prev_dc_stride]; + t = bc->prev_dc[blk_pos - bc->prev_dc_stride]; + + if (FFABS(t - tl) <= FFABS(l - tl)) + dc += l; + else + dc += t; + } else { + dc += bc->prev_dc[blk_pos - bc->prev_dc_stride]; + } + } else if (bx) { + dc += bc->prev_dc[bx - 1]; + } + bc->prev_dc[blk_pos] = dc; + block[0] = dc * bc->qmat[0]; + + while (pos < 64) { + val = rac_get_model256_sym(c, &bc->ac_model); + if (!val) + return 0; + if (val == 0xF0) { + pos += 16; + continue; + } + skip = val >> 4; + val = val & 0xF; + if (!val) + return -1; + pos += skip; + if (pos >= 64) + return -1; + + sign = rac_get_model2_sym(c, &bc->sign_model); + if (val > 1) { + val--; + val = (1 << val) + rac_get_bits(c, val); + } + if (!sign) + val = -val; + + zz_pos = ff_zigzag_direct[pos]; + block[zz_pos] = val * bc->qmat[zz_pos]; + pos++; + } + + return pos == 64 ? 0 : -1; +} + +static void decode_dct_block(RangeCoder *c, DCTBlockCoder *bc, + uint8_t *dst, int stride, int block_size, + int *block, int mb_x, int mb_y) +{ + int i, j; + int bx, by; + int nblocks = block_size >> 3; + + bx = mb_x * nblocks; + by = mb_y * nblocks; + + for (j = 0; j < nblocks; j++) { + for (i = 0; i < nblocks; i++) { + if (decode_dct(c, bc, block, bx + i, by + j)) { + c->got_error = 1; + return; + } + ff_mss34_dct_put(dst + i * 8, stride, block); + } + dst += 8 * stride; + } +} + +static void decode_haar_block(RangeCoder *c, HaarBlockCoder *hc, + uint8_t *dst, int stride, int block_size, + int *block) +{ + const int hsize = block_size >> 1; + int A, B, C, D, t1, t2, t3, t4; + int i, j; + + for (j = 0; j < block_size; j++) { + for (i = 0; i < block_size; i++) { + if (i < hsize && j < hsize) + block[i] = rac_get_model256_sym(c, &hc->coef_model); + else + block[i] = decode_coeff(c, &hc->coef_hi_model); + block[i] *= hc->scale; + } + block += block_size; + } + block -= block_size * block_size; + + for (j = 0; j < hsize; j++) { + for (i = 0; i < hsize; i++) { + A = block[i]; + B = block[i + hsize]; + C = block[i + hsize * block_size]; + D = block[i + hsize * block_size + hsize]; + + t1 = A - B; + t2 = C - D; + t3 = A + B; + t4 = C + D; + dst[i * 2] = av_clip_uint8(t1 - t2); + dst[i * 2 + stride] = av_clip_uint8(t1 + t2); + dst[i * 2 + 1] = av_clip_uint8(t3 - t4); + dst[i * 2 + 1 + stride] = av_clip_uint8(t3 + t4); + } + block += block_size; + dst += stride * 2; + } +} + +static void reset_coders(MSS3Context *ctx, int quality) +{ + int i, j; + + for (i = 0; i < 3; i++) { + ctx->btype[i].last_type = SKIP_BLOCK; + for (j = 0; j < 5; j++) + model_reset(&ctx->btype[i].bt_model[j]); + ctx->fill_coder[i].fill_val = 0; + model_reset(&ctx->fill_coder[i].coef_model); + model256_reset(&ctx->image_coder[i].esc_model); + model256_reset(&ctx->image_coder[i].vec_entry_model); + model_reset(&ctx->image_coder[i].vec_size_model); + for (j = 0; j < 125; j++) + model_reset(&ctx->image_coder[i].vq_model[j]); + if (ctx->dct_coder[i].quality != quality) { + ctx->dct_coder[i].quality = quality; + ff_mss34_gen_quant_mat(ctx->dct_coder[i].qmat, quality, !i); + } + memset(ctx->dct_coder[i].prev_dc, 0, + sizeof(*ctx->dct_coder[i].prev_dc) * + ctx->dct_coder[i].prev_dc_stride * + ctx->dct_coder[i].prev_dc_height); + model_reset(&ctx->dct_coder[i].dc_model); + model2_reset(&ctx->dct_coder[i].sign_model); + model256_reset(&ctx->dct_coder[i].ac_model); + if (ctx->haar_coder[i].quality != quality) { + ctx->haar_coder[i].quality = quality; + ctx->haar_coder[i].scale = 17 - 7 * quality / 50; + } + model_reset(&ctx->haar_coder[i].coef_hi_model); + model256_reset(&ctx->haar_coder[i].coef_model); + } +} + +static av_cold void init_coders(MSS3Context *ctx) +{ + int i, j; + + for (i = 0; i < 3; i++) { + for (j = 0; j < 5; j++) + model_init(&ctx->btype[i].bt_model[j], 5); + model_init(&ctx->fill_coder[i].coef_model, 12); + model256_init(&ctx->image_coder[i].esc_model); + model256_init(&ctx->image_coder[i].vec_entry_model); + model_init(&ctx->image_coder[i].vec_size_model, 3); + for (j = 0; j < 125; j++) + model_init(&ctx->image_coder[i].vq_model[j], 5); + model_init(&ctx->dct_coder[i].dc_model, 12); + model256_init(&ctx->dct_coder[i].ac_model); + model_init(&ctx->haar_coder[i].coef_hi_model, 12); + model256_init(&ctx->haar_coder[i].coef_model); + } +} + +static int mss3_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + MSS3Context *c = avctx->priv_data; + RangeCoder *acoder = &c->coder; + GetByteContext gb; + uint8_t *dst[3]; + int dec_width, dec_height, dec_x, dec_y, quality, keyframe; + int x, y, i, mb_width, mb_height, blk_size, btype; + int ret; + + if (buf_size < HEADER_SIZE) { + av_log(avctx, AV_LOG_ERROR, + "Frame should have at least %d bytes, got %d instead\n", + HEADER_SIZE, buf_size); + return AVERROR_INVALIDDATA; + } + + bytestream2_init(&gb, buf, buf_size); + keyframe = bytestream2_get_be32(&gb); + if (keyframe & ~0x301) { + av_log(avctx, AV_LOG_ERROR, "Invalid frame type %X\n", keyframe); + return AVERROR_INVALIDDATA; + } + keyframe = !(keyframe & 1); + bytestream2_skip(&gb, 6); + dec_x = bytestream2_get_be16(&gb); + dec_y = bytestream2_get_be16(&gb); + dec_width = bytestream2_get_be16(&gb); + dec_height = bytestream2_get_be16(&gb); + + if (dec_x + dec_width > avctx->width || + dec_y + dec_height > avctx->height || + (dec_width | dec_height) & 0xF) { + av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d +%d,%d\n", + dec_width, dec_height, dec_x, dec_y); + return AVERROR_INVALIDDATA; + } + bytestream2_skip(&gb, 4); + quality = bytestream2_get_byte(&gb); + if (quality < 1 || quality > 100) { + av_log(avctx, AV_LOG_ERROR, "Invalid quality setting %d\n", quality); + return AVERROR_INVALIDDATA; + } + bytestream2_skip(&gb, 4); + + if (keyframe && !bytestream2_get_bytes_left(&gb)) { + av_log(avctx, AV_LOG_ERROR, "Keyframe without data found\n"); + return AVERROR_INVALIDDATA; + } + if (!keyframe && c->got_error) + return buf_size; + c->got_error = 0; + + if ((ret = ff_reget_buffer(avctx, &c->pic)) < 0) + return ret; + c->pic.key_frame = keyframe; + c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; + if (!bytestream2_get_bytes_left(&gb)) { + if ((ret = av_frame_ref(data, &c->pic)) < 0) + return ret; + *got_frame = 1; + + return buf_size; + } + + reset_coders(c, quality); + + rac_init(acoder, buf + HEADER_SIZE, buf_size - HEADER_SIZE); + + mb_width = dec_width >> 4; + mb_height = dec_height >> 4; + dst[0] = c->pic.data[0] + dec_x + dec_y * c->pic.linesize[0]; + dst[1] = c->pic.data[1] + dec_x / 2 + (dec_y / 2) * c->pic.linesize[1]; + dst[2] = c->pic.data[2] + dec_x / 2 + (dec_y / 2) * c->pic.linesize[2]; + for (y = 0; y < mb_height; y++) { + for (x = 0; x < mb_width; x++) { + for (i = 0; i < 3; i++) { + blk_size = 8 << !i; + + btype = decode_block_type(acoder, c->btype + i); + switch (btype) { + case FILL_BLOCK: + decode_fill_block(acoder, c->fill_coder + i, + dst[i] + x * blk_size, + c->pic.linesize[i], blk_size); + break; + case IMAGE_BLOCK: + decode_image_block(acoder, c->image_coder + i, + dst[i] + x * blk_size, + c->pic.linesize[i], blk_size); + break; + case DCT_BLOCK: + decode_dct_block(acoder, c->dct_coder + i, + dst[i] + x * blk_size, + c->pic.linesize[i], blk_size, + c->dctblock, x, y); + break; + case HAAR_BLOCK: + decode_haar_block(acoder, c->haar_coder + i, + dst[i] + x * blk_size, + c->pic.linesize[i], blk_size, + c->hblock); + break; + } + if (c->got_error || acoder->got_error) { + av_log(avctx, AV_LOG_ERROR, "Error decoding block %d,%d\n", + x, y); + c->got_error = 1; + return AVERROR_INVALIDDATA; + } + } + } + dst[0] += c->pic.linesize[0] * 16; + dst[1] += c->pic.linesize[1] * 8; + dst[2] += c->pic.linesize[2] * 8; + } + + if ((ret = av_frame_ref(data, &c->pic)) < 0) + return ret; + + *got_frame = 1; + + return buf_size; +} + +static av_cold int mss3_decode_init(AVCodecContext *avctx) +{ + MSS3Context * const c = avctx->priv_data; + int i; + + c->avctx = avctx; + + if ((avctx->width & 0xF) || (avctx->height & 0xF)) { + av_log(avctx, AV_LOG_ERROR, + "Image dimensions should be a multiple of 16.\n"); + return AVERROR_INVALIDDATA; + } + + c->got_error = 0; + for (i = 0; i < 3; i++) { + int b_width = avctx->width >> (2 + !!i); + int b_height = avctx->height >> (2 + !!i); + c->dct_coder[i].prev_dc_stride = b_width; + c->dct_coder[i].prev_dc_height = b_height; + c->dct_coder[i].prev_dc = av_malloc(sizeof(*c->dct_coder[i].prev_dc) * + b_width * b_height); + if (!c->dct_coder[i].prev_dc) { + av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n"); + while (i >= 0) { + av_freep(&c->dct_coder[i].prev_dc); + i--; + } + return AVERROR(ENOMEM); + } + } + + avctx->pix_fmt = AV_PIX_FMT_YUV420P; + + init_coders(c); + + return 0; +} + +static av_cold int mss3_decode_end(AVCodecContext *avctx) +{ + MSS3Context * const c = avctx->priv_data; + int i; + + av_frame_unref(&c->pic); + for (i = 0; i < 3; i++) + av_freep(&c->dct_coder[i].prev_dc); + + return 0; +} + +AVCodec ff_msa1_decoder = { + .name = "msa1", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_MSA1, + .priv_data_size = sizeof(MSS3Context), + .init = mss3_decode_init, + .close = mss3_decode_end, + .decode = mss3_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("MS ATC Screen"), +}; |