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"
28 #include "libavutil/thread.h"
35 #include "mpeg12data.h"
37 #define CCP_VLC_BITS 5
38 #define DC_CCP_VLC_BITS 4
39 #define AC_CCP_VLC_BITS 6
40 #define ASV1_LEVEL_VLC_BITS 4
41 #define ASV2_LEVEL_VLC_BITS 10
45 static VLC dc_ccp_vlc;
46 static VLC ac_ccp_vlc;
47 static VLC asv2_level_vlc;
49 static av_cold void init_vlcs(void)
51 INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
52 &ff_asv_ccp_tab[0][1], 2, 1,
53 &ff_asv_ccp_tab[0][0], 2, 1, 32);
54 INIT_LE_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
55 &ff_asv_dc_ccp_tab[0][1], 2, 1,
56 &ff_asv_dc_ccp_tab[0][0], 2, 1, 16);
57 INIT_LE_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
58 &ff_asv_ac_ccp_tab[0][1], 2, 1,
59 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
60 INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
61 &ff_asv_level_tab[0][1], 2, 1,
62 &ff_asv_level_tab[0][0], 2, 1, 16);
63 INIT_LE_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
64 &ff_asv2_level_tab[0][1], 4, 2,
65 &ff_asv2_level_tab[0][0], 4, 2, 1024);
68 static inline int asv1_get_level(GetBitContext *gb)
70 int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
73 return get_sbits(gb, 8);
78 // get_vlc2() is big-endian in this file
79 static inline int asv2_get_vlc2(GetBitContext *gb, VLC_TYPE (*table)[2], int bits)
85 UPDATE_CACHE_LE(re, gb);
87 index = SHOW_UBITS_LE(re, gb, bits);
88 code = table[index][0];
90 LAST_SKIP_BITS(re, gb, n);
97 static inline int asv2_get_level(GetBitContext *gb)
99 int code = asv2_get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS);
102 return (int8_t) get_bits_le(gb, 8);
107 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
111 block[0] = 8 * get_bits(&a->gb, 8);
113 for (i = 0; i < 11; i++) {
114 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
119 if (ccp < 0 || i >= 10) {
120 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
121 return AVERROR_INVALIDDATA;
125 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
127 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
129 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
131 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
138 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
142 count = get_bits_le(&a->gb, 4);
144 block[0] = 8 * get_bits_le(&a->gb, 8);
146 ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS);
149 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
151 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
153 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
156 for (i = 1; i < count + 1; i++) {
157 const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS);
161 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
163 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
165 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
167 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
174 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
178 a->bdsp.clear_blocks(block[0]);
180 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
181 for (i = 0; i < 6; i++) {
182 if ((ret = asv1_decode_block(a, block[i])) < 0)
186 for (i = 0; i < 6; i++) {
187 if ((ret = asv2_decode_block(a, block[i])) < 0)
194 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
196 int16_t(*block)[64] = a->block;
197 int linesize = frame->linesize[0];
199 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
200 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
201 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
203 a->idsp.idct_put(dest_y, linesize, block[0]);
204 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
205 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
206 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
208 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
209 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
210 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
214 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
217 ASV1Context *const a = avctx->priv_data;
218 const uint8_t *buf = avpkt->data;
219 int buf_size = avpkt->size;
220 AVFrame *const p = data;
223 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
224 return AVERROR_INVALIDDATA;
226 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
228 p->pict_type = AV_PICTURE_TYPE_I;
231 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
232 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
234 if (!a->bitstream_buffer)
235 return AVERROR(ENOMEM);
237 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
238 (const uint32_t *) buf, buf_size / 4);
239 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
241 ret = init_get_bits8_le(&a->gb, buf, buf_size);
246 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
247 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
248 if ((ret = decode_mb(a, a->block)) < 0)
251 idct_put(a, p, mb_x, mb_y);
255 if (a->mb_width2 != a->mb_width) {
257 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
258 if ((ret = decode_mb(a, a->block)) < 0)
261 idct_put(a, p, mb_x, mb_y);
265 if (a->mb_height2 != a->mb_height) {
266 mb_y = a->mb_height2;
267 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
268 if ((ret = decode_mb(a, a->block)) < 0)
271 idct_put(a, p, mb_x, mb_y);
279 return (get_bits_count(&a->gb) + 31) / 32 * 4;
282 static av_cold int decode_init(AVCodecContext *avctx)
284 static AVOnce init_static_once = AV_ONCE_INIT;
285 ASV1Context *const a = avctx->priv_data;
286 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
289 if (avctx->extradata_size < 1) {
290 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
293 ff_asv_common_init(avctx);
294 ff_blockdsp_init(&a->bdsp, avctx);
295 ff_idctdsp_init(&a->idsp, avctx);
296 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
297 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
299 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
300 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
301 if (avctx->codec_id == AV_CODEC_ID_ASV1)
307 for (i = 0; i < 64; i++) {
308 int index = ff_asv_scantab[i];
310 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
314 ff_thread_once(&init_static_once, init_vlcs);
319 static av_cold int decode_end(AVCodecContext *avctx)
321 ASV1Context *const a = avctx->priv_data;
323 av_freep(&a->bitstream_buffer);
324 a->bitstream_buffer_size = 0;
329 #if CONFIG_ASV1_DECODER
330 const AVCodec ff_asv1_decoder = {
332 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
333 .type = AVMEDIA_TYPE_VIDEO,
334 .id = AV_CODEC_ID_ASV1,
335 .priv_data_size = sizeof(ASV1Context),
338 .decode = decode_frame,
339 .capabilities = AV_CODEC_CAP_DR1,
340 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
344 #if CONFIG_ASV2_DECODER
345 const AVCodec ff_asv2_decoder = {
347 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
348 .type = AVMEDIA_TYPE_VIDEO,
349 .id = AV_CODEC_ID_ASV2,
350 .priv_data_size = sizeof(ASV1Context),
352 .decode = decode_frame,
353 .capabilities = AV_CODEC_CAP_DR1,
354 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,