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"
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(ASV1Context *a)
56 INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
57 &ff_asv_ccp_tab[0][1], 2, 1,
58 &ff_asv_ccp_tab[0][0], 2, 1, 32);
59 INIT_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
60 &ff_asv_dc_ccp_tab[0][1], 2, 1,
61 &ff_asv_dc_ccp_tab[0][0], 2, 1, 16);
62 INIT_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, 64);
65 INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
66 &ff_asv_level_tab[0][1], 2, 1,
67 &ff_asv_level_tab[0][0], 2, 1, 16);
68 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
69 &ff_asv2_level_tab[0][1], 2, 1,
70 &ff_asv2_level_tab[0][0], 2, 1, 1024);
74 // FIXME write a reversed bitstream reader to avoid the double reverse
75 static inline int asv2_get_bits(GetBitContext *gb, int n)
77 return ff_reverse[get_bits(gb, n) << (8 - n)];
80 static inline int asv1_get_level(GetBitContext *gb)
82 int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
85 return get_sbits(gb, 8);
90 static inline int asv2_get_level(GetBitContext *gb)
92 int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
95 return (int8_t) asv2_get_bits(gb, 8);
100 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
104 block[0] = 8 * get_bits(&a->gb, 8);
106 for (i = 0; i < 11; i++) {
107 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
112 if (ccp < 0 || i >= 10) {
113 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
114 return AVERROR_INVALIDDATA;
118 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
120 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
122 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
124 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
131 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
135 count = asv2_get_bits(&a->gb, 4);
137 block[0] = 8 * asv2_get_bits(&a->gb, 8);
139 ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS, 1);
142 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
144 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
146 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
149 for (i = 1; i < count + 1; i++) {
150 const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS, 1);
154 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
156 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
158 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
160 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
167 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
171 a->bdsp.clear_blocks(block[0]);
173 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
174 for (i = 0; i < 6; i++) {
175 if ((ret = asv1_decode_block(a, block[i])) < 0)
179 for (i = 0; i < 6; i++) {
180 if ((ret = asv2_decode_block(a, block[i])) < 0)
187 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
189 int16_t(*block)[64] = a->block;
190 int linesize = frame->linesize[0];
192 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
193 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
194 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
196 a->idsp.idct_put(dest_y, linesize, block[0]);
197 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
198 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
199 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
201 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
202 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
203 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
207 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
210 ASV1Context *const a = avctx->priv_data;
211 const uint8_t *buf = avpkt->data;
212 int buf_size = avpkt->size;
213 AVFrame *const p = data;
216 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
217 return AVERROR_INVALIDDATA;
219 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
221 p->pict_type = AV_PICTURE_TYPE_I;
224 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
226 if (!a->bitstream_buffer)
227 return AVERROR(ENOMEM);
229 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
230 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
231 (const uint32_t *) buf, buf_size / 4);
234 for (i = 0; i < buf_size; i++)
235 a->bitstream_buffer[i] = ff_reverse[buf[i]];
238 ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);
242 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
243 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
244 if ((ret = decode_mb(a, a->block)) < 0)
247 idct_put(a, p, mb_x, mb_y);
251 if (a->mb_width2 != a->mb_width) {
253 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
254 if ((ret = decode_mb(a, a->block)) < 0)
257 idct_put(a, p, mb_x, mb_y);
261 if (a->mb_height2 != a->mb_height) {
262 mb_y = a->mb_height2;
263 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
264 if ((ret = decode_mb(a, a->block)) < 0)
267 idct_put(a, p, mb_x, mb_y);
275 return (get_bits_count(&a->gb) + 31) / 32 * 4;
278 static av_cold int decode_init(AVCodecContext *avctx)
280 ASV1Context *const a = avctx->priv_data;
281 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
284 if (avctx->extradata_size < 1) {
285 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
288 ff_asv_common_init(avctx);
289 ff_blockdsp_init(&a->bdsp, avctx);
290 ff_idctdsp_init(&a->idsp, avctx);
292 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
293 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
295 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
296 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
297 if (avctx->codec_id == AV_CODEC_ID_ASV1)
303 for (i = 0; i < 64; i++) {
304 int index = ff_asv_scantab[i];
306 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
313 static av_cold int decode_end(AVCodecContext *avctx)
315 ASV1Context *const a = avctx->priv_data;
317 av_freep(&a->bitstream_buffer);
318 a->bitstream_buffer_size = 0;
323 #if CONFIG_ASV1_DECODER
324 AVCodec ff_asv1_decoder = {
326 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
327 .type = AVMEDIA_TYPE_VIDEO,
328 .id = AV_CODEC_ID_ASV1,
329 .priv_data_size = sizeof(ASV1Context),
332 .decode = decode_frame,
333 .capabilities = AV_CODEC_CAP_DR1,
337 #if CONFIG_ASV2_DECODER
338 AVCodec ff_asv2_decoder = {
340 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
341 .type = AVMEDIA_TYPE_VIDEO,
342 .id = AV_CODEC_ID_ASV2,
343 .priv_data_size = sizeof(ASV1Context),
346 .decode = decode_frame,
347 .capabilities = AV_CODEC_CAP_DR1,