2 * Copyright (c) 2003 Michael Niedermayer
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "libavutil/attributes.h"
27 #include "libavutil/mem.h"
34 #include "mpeg12data.h"
36 #define CCP_VLC_BITS 5
37 #define DC_CCP_VLC_BITS 4
38 #define AC_CCP_VLC_BITS 6
39 #define ASV1_LEVEL_VLC_BITS 4
40 #define ASV2_LEVEL_VLC_BITS 10
44 static VLC dc_ccp_vlc;
45 static VLC ac_ccp_vlc;
46 static VLC asv2_level_vlc;
48 static av_cold void init_vlcs(ASV1Context *a)
55 INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
56 &ff_asv_ccp_tab[0][1], 2, 1,
57 &ff_asv_ccp_tab[0][0], 2, 1, 32);
58 INIT_LE_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
59 &ff_asv_dc_ccp_tab[0][1], 2, 1,
60 &ff_asv_dc_ccp_tab[0][0], 2, 1, 16);
61 INIT_LE_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
62 &ff_asv_ac_ccp_tab[0][1], 2, 1,
63 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
64 INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
65 &ff_asv_level_tab[0][1], 2, 1,
66 &ff_asv_level_tab[0][0], 2, 1, 16);
67 INIT_LE_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
68 &ff_asv2_level_tab[0][1], 4, 2,
69 &ff_asv2_level_tab[0][0], 4, 2, 1024);
73 static inline int asv1_get_level(GetBitContext *gb)
75 int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
78 return get_sbits(gb, 8);
83 // get_vlc2() is big-endian in this file
84 static inline int asv2_get_vlc2(GetBitContext *gb, VLC_TYPE (*table)[2], int bits)
90 UPDATE_CACHE_LE(re, gb);
92 index = SHOW_UBITS_LE(re, gb, bits);
93 code = table[index][0];
95 LAST_SKIP_BITS(re, gb, n);
102 static inline int asv2_get_level(GetBitContext *gb)
104 int code = asv2_get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS);
107 return (int8_t) get_bits_le(gb, 8);
112 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
116 block[0] = 8 * get_bits(&a->gb, 8);
118 for (i = 0; i < 11; i++) {
119 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
124 if (ccp < 0 || i >= 10) {
125 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
126 return AVERROR_INVALIDDATA;
130 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
132 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
134 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
136 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
143 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
147 count = get_bits_le(&a->gb, 4);
149 block[0] = 8 * get_bits_le(&a->gb, 8);
151 ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS);
154 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
156 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
158 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
161 for (i = 1; i < count + 1; i++) {
162 const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS);
166 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
168 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
170 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
172 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
179 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
183 a->bdsp.clear_blocks(block[0]);
185 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
186 for (i = 0; i < 6; i++) {
187 if ((ret = asv1_decode_block(a, block[i])) < 0)
191 for (i = 0; i < 6; i++) {
192 if ((ret = asv2_decode_block(a, block[i])) < 0)
199 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
201 int16_t(*block)[64] = a->block;
202 int linesize = frame->linesize[0];
204 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
205 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
206 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
208 a->idsp.idct_put(dest_y, linesize, block[0]);
209 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
210 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
211 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
213 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
214 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
215 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
219 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
222 ASV1Context *const a = avctx->priv_data;
223 const uint8_t *buf = avpkt->data;
224 int buf_size = avpkt->size;
225 AVFrame *const p = data;
228 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
229 return AVERROR_INVALIDDATA;
231 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
233 p->pict_type = AV_PICTURE_TYPE_I;
236 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
237 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
239 if (!a->bitstream_buffer)
240 return AVERROR(ENOMEM);
242 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
243 (const uint32_t *) buf, buf_size / 4);
244 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
246 ret = init_get_bits8_le(&a->gb, buf, buf_size);
251 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
252 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
253 if ((ret = decode_mb(a, a->block)) < 0)
256 idct_put(a, p, mb_x, mb_y);
260 if (a->mb_width2 != a->mb_width) {
262 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
263 if ((ret = decode_mb(a, a->block)) < 0)
266 idct_put(a, p, mb_x, mb_y);
270 if (a->mb_height2 != a->mb_height) {
271 mb_y = a->mb_height2;
272 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
273 if ((ret = decode_mb(a, a->block)) < 0)
276 idct_put(a, p, mb_x, mb_y);
284 return (get_bits_count(&a->gb) + 31) / 32 * 4;
287 static av_cold int decode_init(AVCodecContext *avctx)
289 ASV1Context *const a = avctx->priv_data;
290 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
293 if (avctx->extradata_size < 1) {
294 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
297 ff_asv_common_init(avctx);
298 ff_blockdsp_init(&a->bdsp, avctx);
299 ff_idctdsp_init(&a->idsp, avctx);
301 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
302 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
304 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
305 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
306 if (avctx->codec_id == AV_CODEC_ID_ASV1)
312 for (i = 0; i < 64; i++) {
313 int index = ff_asv_scantab[i];
315 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
322 static av_cold int decode_end(AVCodecContext *avctx)
324 ASV1Context *const a = avctx->priv_data;
326 av_freep(&a->bitstream_buffer);
327 a->bitstream_buffer_size = 0;
332 #if CONFIG_ASV1_DECODER
333 AVCodec ff_asv1_decoder = {
335 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
336 .type = AVMEDIA_TYPE_VIDEO,
337 .id = AV_CODEC_ID_ASV1,
338 .priv_data_size = sizeof(ASV1Context),
341 .decode = decode_frame,
342 .capabilities = AV_CODEC_CAP_DR1,
346 #if CONFIG_ASV2_DECODER
347 AVCodec ff_asv2_decoder = {
349 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
350 .type = AVMEDIA_TYPE_VIDEO,
351 .id = AV_CODEC_ID_ASV2,
352 .priv_data_size = sizeof(ASV1Context),
354 .decode = decode_frame,
355 .capabilities = AV_CODEC_CAP_DR1,