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_CUSTOM_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,
61 INIT_VLC_OUTPUT_LE, 16);
62 INIT_CUSTOM_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
63 &ff_asv_ac_ccp_tab[0][1], 2, 1,
64 &ff_asv_ac_ccp_tab[0][0], 2, 1,
65 INIT_VLC_OUTPUT_LE, 64);
66 INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
67 &ff_asv_level_tab[0][1], 2, 1,
68 &ff_asv_level_tab[0][0], 2, 1, 16);
69 INIT_CUSTOM_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
70 &ff_asv2_level_tab[0][1], 2, 1,
71 &ff_asv2_level_tab[0][0], 2, 1,
72 INIT_VLC_OUTPUT_LE, 1024);
76 static inline int asv1_get_level(GetBitContext *gb)
78 int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
81 return get_sbits(gb, 8);
86 // get_vlc2() is big-endian in this file
87 static inline int asv2_get_vlc2(GetBitContext *gb, VLC_TYPE (*table)[2], int bits)
93 UPDATE_CACHE_LE(re, gb);
95 index = SHOW_UBITS_LE(re, gb, bits);
96 code = table[index][0];
98 LAST_SKIP_BITS(re, gb, n);
100 CLOSE_READER(re, gb);
105 static inline int asv2_get_level(GetBitContext *gb)
107 int code = asv2_get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS);
110 return (int8_t) get_bits_le(gb, 8);
115 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
119 block[0] = 8 * get_bits(&a->gb, 8);
121 for (i = 0; i < 11; i++) {
122 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
127 if (ccp < 0 || i >= 10) {
128 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
129 return AVERROR_INVALIDDATA;
133 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
135 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
137 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
139 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
146 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
150 count = get_bits_le(&a->gb, 4);
152 block[0] = 8 * get_bits_le(&a->gb, 8);
154 ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS);
157 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
159 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
161 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
164 for (i = 1; i < count + 1; i++) {
165 const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS);
169 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
171 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
173 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
175 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
182 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
186 a->bdsp.clear_blocks(block[0]);
188 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
189 for (i = 0; i < 6; i++) {
190 if ((ret = asv1_decode_block(a, block[i])) < 0)
194 for (i = 0; i < 6; i++) {
195 if ((ret = asv2_decode_block(a, block[i])) < 0)
202 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
204 int16_t(*block)[64] = a->block;
205 int linesize = frame->linesize[0];
207 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
208 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
209 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
211 a->idsp.idct_put(dest_y, linesize, block[0]);
212 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
213 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
214 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
216 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
217 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
218 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
222 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
225 ASV1Context *const a = avctx->priv_data;
226 const uint8_t *buf = avpkt->data;
227 int buf_size = avpkt->size;
228 AVFrame *const p = data;
231 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
232 return AVERROR_INVALIDDATA;
234 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
236 p->pict_type = AV_PICTURE_TYPE_I;
239 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
240 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
242 if (!a->bitstream_buffer)
243 return AVERROR(ENOMEM);
245 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
246 (const uint32_t *) buf, buf_size / 4);
247 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
249 ret = init_get_bits8_le(&a->gb, buf, buf_size);
254 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
255 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
256 if ((ret = decode_mb(a, a->block)) < 0)
259 idct_put(a, p, mb_x, mb_y);
263 if (a->mb_width2 != a->mb_width) {
265 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
266 if ((ret = decode_mb(a, a->block)) < 0)
269 idct_put(a, p, mb_x, mb_y);
273 if (a->mb_height2 != a->mb_height) {
274 mb_y = a->mb_height2;
275 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
276 if ((ret = decode_mb(a, a->block)) < 0)
279 idct_put(a, p, mb_x, mb_y);
287 return (get_bits_count(&a->gb) + 31) / 32 * 4;
290 static av_cold int decode_init(AVCodecContext *avctx)
292 ASV1Context *const a = avctx->priv_data;
293 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
296 if (avctx->extradata_size < 1) {
297 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
300 ff_asv_common_init(avctx);
301 ff_blockdsp_init(&a->bdsp, avctx);
302 ff_idctdsp_init(&a->idsp, avctx);
304 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
305 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
307 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
308 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
309 if (avctx->codec_id == AV_CODEC_ID_ASV1)
315 for (i = 0; i < 64; i++) {
316 int index = ff_asv_scantab[i];
318 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
325 static av_cold int decode_end(AVCodecContext *avctx)
327 ASV1Context *const a = avctx->priv_data;
329 av_freep(&a->bitstream_buffer);
330 a->bitstream_buffer_size = 0;
335 #if CONFIG_ASV1_DECODER
336 AVCodec ff_asv1_decoder = {
338 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
339 .type = AVMEDIA_TYPE_VIDEO,
340 .id = AV_CODEC_ID_ASV1,
341 .priv_data_size = sizeof(ASV1Context),
344 .decode = decode_frame,
345 .capabilities = AV_CODEC_CAP_DR1,
349 #if CONFIG_ASV2_DECODER
350 AVCodec ff_asv2_decoder = {
352 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
353 .type = AVMEDIA_TYPE_VIDEO,
354 .id = AV_CODEC_ID_ASV2,
355 .priv_data_size = sizeof(ASV1Context),
357 .decode = decode_frame,
358 .capabilities = AV_CODEC_CAP_DR1,