diff options
Diffstat (limited to 'ffmpeg/libavcodec/mss3.c')
| -rw-r--r-- | ffmpeg/libavcodec/mss3.c | 873 |
1 files changed, 0 insertions, 873 deletions
diff --git a/ffmpeg/libavcodec/mss3.c b/ffmpeg/libavcodec/mss3.c deleted file mode 100644 index c6bb838..0000000 --- a/ffmpeg/libavcodec/mss3.c +++ /dev/null @@ -1,873 +0,0 @@ -/* - * 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_end(AVCodecContext *avctx) -{ - MSS3Context * const c = avctx->priv_data; - int i; - - av_frame_free(&c->pic); - for (i = 0; i < 3; i++) - av_freep(&c->dct_coder[i].prev_dc); - - return 0; -} - -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"); - av_frame_free(&c->pic); - while (i >= 0) { - av_freep(&c->dct_coder[i].prev_dc); - i--; - } - return AVERROR(ENOMEM); - } - } - - c->pic = av_frame_alloc(); - if (!c->pic) { - mss3_decode_end(avctx); - return AVERROR(ENOMEM); - } - - avctx->pix_fmt = AV_PIX_FMT_YUV420P; - - init_coders(c); - - return 0; -} - -AVCodec ff_msa1_decoder = { - .name = "msa1", - .long_name = NULL_IF_CONFIG_SMALL("MS ATC Screen"), - .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, -}; |