2 * Copyright (c) 2003 Michael Niedermayer
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; 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"
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, VLC_BITS, 17,
56 &ff_asv_ccp_tab[0][1], 2, 1,
57 &ff_asv_ccp_tab[0][0], 2, 1, 64);
58 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
59 &ff_asv_dc_ccp_tab[0][1], 2, 1,
60 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
61 INIT_VLC_STATIC(&ac_ccp_vlc, 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, VLC_BITS, 7,
65 &ff_asv_level_tab[0][1], 2, 1,
66 &ff_asv_level_tab[0][0], 2, 1, 64);
67 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
68 &ff_asv2_level_tab[0][1], 2, 1,
69 &ff_asv2_level_tab[0][0], 2, 1, 1024);
73 //FIXME write a reversed bitstream reader to avoid the double reverse
74 static inline int asv2_get_bits(GetBitContext *gb, int n)
76 return ff_reverse[get_bits(gb, n) << (8-n)];
79 static inline int asv1_get_level(GetBitContext *gb)
81 int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
84 return get_sbits(gb, 8);
89 static inline int asv2_get_level(GetBitContext *gb)
91 int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
94 return (int8_t)asv2_get_bits(gb, 8);
99 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
103 block[0] = 8 * get_bits(&a->gb, 8);
105 for (i = 0; i < 11; i++) {
106 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
111 if (ccp < 0 || i >= 10) {
112 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
113 return AVERROR_INVALIDDATA;
117 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
119 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
121 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
123 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
130 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
134 count = asv2_get_bits(&a->gb, 4);
136 block[0] = 8 * asv2_get_bits(&a->gb, 8);
138 ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
141 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
143 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
145 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
148 for (i = 1; i < count + 1; i++) {
149 const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
153 block[a->scantable.permutated[4*i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 0]) >> 4;
155 block[a->scantable.permutated[4*i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 1]) >> 4;
157 block[a->scantable.permutated[4*i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 2]) >> 4;
159 block[a->scantable.permutated[4*i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 3]) >> 4;
166 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
170 a->dsp.clear_blocks(block[0]);
172 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
173 for (i = 0; i < 6; i++) {
174 if (asv1_decode_block(a, block[i]) < 0)
178 for (i = 0; i < 6; i++) {
179 if (asv2_decode_block(a, block[i]) < 0)
186 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
188 int16_t (*block)[64] = a->block;
189 int linesize = frame->linesize[0];
191 uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
192 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
193 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
195 a->dsp.idct_put(dest_y , linesize, block[0]);
196 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
197 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
198 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
200 if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
201 a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]);
202 a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]);
206 static int decode_frame(AVCodecContext *avctx,
207 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 ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
217 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
220 p->pict_type = AV_PICTURE_TYPE_I;
223 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
225 if (!a->bitstream_buffer)
226 return AVERROR(ENOMEM);
228 if (avctx->codec_id == AV_CODEC_ID_ASV1)
229 a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
232 for (i = 0; i < buf_size; i++)
233 a->bitstream_buffer[i] = ff_reverse[buf[i]];
236 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
238 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
239 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
240 if ((ret = decode_mb(a, a->block)) < 0)
243 idct_put(a, p, mb_x, mb_y);
247 if (a->mb_width2 != a->mb_width) {
249 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
250 if ((ret = decode_mb(a, a->block)) < 0)
253 idct_put(a, p, mb_x, mb_y);
257 if (a->mb_height2 != a->mb_height) {
258 mb_y = a->mb_height2;
259 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
260 if ((ret = decode_mb(a, a->block)) < 0)
263 idct_put(a, p, mb_x, mb_y);
271 return (get_bits_count(&a->gb) + 31) / 32 * 4;
274 static av_cold int decode_init(AVCodecContext *avctx)
276 ASV1Context * const a = avctx->priv_data;
277 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
280 ff_asv_common_init(avctx);
282 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
283 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
285 a->inv_qscale = avctx->extradata[0];
286 if (a->inv_qscale == 0) {
287 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
288 if (avctx->codec_id == AV_CODEC_ID_ASV1)
294 for (i = 0; i < 64; i++) {
295 int index = ff_asv_scantab[i];
297 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
303 static av_cold int decode_end(AVCodecContext *avctx)
305 ASV1Context * const a = avctx->priv_data;
307 av_freep(&a->bitstream_buffer);
308 a->bitstream_buffer_size = 0;
313 AVCodec ff_asv1_decoder = {
315 .type = AVMEDIA_TYPE_VIDEO,
316 .id = AV_CODEC_ID_ASV1,
317 .priv_data_size = sizeof(ASV1Context),
320 .decode = decode_frame,
321 .capabilities = CODEC_CAP_DR1,
322 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
325 AVCodec ff_asv2_decoder = {
327 .type = AVMEDIA_TYPE_VIDEO,
328 .id = AV_CODEC_ID_ASV2,
329 .priv_data_size = sizeof(ASV1Context),
332 .decode = decode_frame,
333 .capabilities = CODEC_CAP_DR1,
334 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),