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"
33 #include "mpeg12data.h"
36 #define ASV2_LEVEL_VLC_BITS 10
40 static VLC dc_ccp_vlc;
41 static VLC ac_ccp_vlc;
42 static VLC asv2_level_vlc;
44 static av_cold void init_vlcs(ASV1Context *a)
51 INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
52 &ff_asv_ccp_tab[0][1], 2, 1,
53 &ff_asv_ccp_tab[0][0], 2, 1, 64);
54 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
55 &ff_asv_dc_ccp_tab[0][1], 2, 1,
56 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
57 INIT_VLC_STATIC(&ac_ccp_vlc, 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, VLC_BITS, 7,
61 &ff_asv_level_tab[0][1], 2, 1,
62 &ff_asv_level_tab[0][0], 2, 1, 64);
63 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
64 &ff_asv2_level_tab[0][1], 2, 1,
65 &ff_asv2_level_tab[0][0], 2, 1, 1024);
69 //FIXME write a reversed bitstream reader to avoid the double reverse
70 static inline int asv2_get_bits(GetBitContext *gb, int n)
72 return ff_reverse[get_bits(gb, n) << (8-n)];
75 static inline int asv1_get_level(GetBitContext *gb)
77 int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
80 return get_sbits(gb, 8);
85 static inline int asv2_get_level(GetBitContext *gb)
87 int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
90 return (int8_t)asv2_get_bits(gb, 8);
95 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
99 block[0] = 8 * get_bits(&a->gb, 8);
101 for (i = 0; i < 11; i++) {
102 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
107 if (ccp < 0 || i >= 10) {
108 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
109 return AVERROR_INVALIDDATA;
113 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
115 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
117 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
119 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
126 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
130 count = asv2_get_bits(&a->gb, 4);
132 block[0] = 8 * asv2_get_bits(&a->gb, 8);
134 ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
137 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
139 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
141 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
144 for (i = 1; i < count + 1; i++) {
145 const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
149 block[a->scantable.permutated[4*i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 0]) >> 4;
151 block[a->scantable.permutated[4*i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 1]) >> 4;
153 block[a->scantable.permutated[4*i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 2]) >> 4;
155 block[a->scantable.permutated[4*i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 3]) >> 4;
162 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
166 a->dsp.clear_blocks(block[0]);
168 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
169 for (i = 0; i < 6; i++) {
170 if (asv1_decode_block(a, block[i]) < 0)
174 for (i = 0; i < 6; i++) {
175 if (asv2_decode_block(a, block[i]) < 0)
182 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
184 int16_t (*block)[64] = a->block;
185 int linesize = frame->linesize[0];
187 uint8_t *dest_y = frame->data[0] + (mb_y * 16* linesize ) + mb_x * 16;
188 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
189 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
191 a->dsp.idct_put(dest_y , linesize, block[0]);
192 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
193 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
194 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
196 if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
197 a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]);
198 a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]);
202 static int decode_frame(AVCodecContext *avctx,
203 void *data, int *got_frame,
206 ASV1Context * const a = avctx->priv_data;
207 const uint8_t *buf = avpkt->data;
208 int buf_size = avpkt->size;
209 AVFrame * const p = data;
212 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
214 p->pict_type = AV_PICTURE_TYPE_I;
217 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
219 if (!a->bitstream_buffer)
220 return AVERROR(ENOMEM);
222 if (avctx->codec_id == AV_CODEC_ID_ASV1)
223 a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
226 for (i = 0; i < buf_size; i++)
227 a->bitstream_buffer[i] = ff_reverse[buf[i]];
230 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
232 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
233 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
234 if ((ret = decode_mb(a, a->block)) < 0)
237 idct_put(a, p, mb_x, mb_y);
241 if (a->mb_width2 != a->mb_width) {
243 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
244 if ((ret = decode_mb(a, a->block)) < 0)
247 idct_put(a, p, mb_x, mb_y);
251 if (a->mb_height2 != a->mb_height) {
252 mb_y = a->mb_height2;
253 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
254 if ((ret = decode_mb(a, a->block)) < 0)
257 idct_put(a, p, mb_x, mb_y);
265 return (get_bits_count(&a->gb) + 31) / 32 * 4;
268 static av_cold int decode_init(AVCodecContext *avctx)
270 ASV1Context * const a = avctx->priv_data;
271 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
274 if (avctx->extradata_size < 1) {
275 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
278 ff_asv_common_init(avctx);
280 ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
281 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
283 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
284 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
285 if (avctx->codec_id == AV_CODEC_ID_ASV1)
291 for (i = 0; i < 64; i++) {
292 int index = ff_asv_scantab[i];
294 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
300 static av_cold int decode_end(AVCodecContext *avctx)
302 ASV1Context * const a = avctx->priv_data;
304 av_freep(&a->bitstream_buffer);
305 a->bitstream_buffer_size = 0;
310 #if CONFIG_ASV1_DECODER
311 AVCodec ff_asv1_decoder = {
313 .type = AVMEDIA_TYPE_VIDEO,
314 .id = AV_CODEC_ID_ASV1,
315 .priv_data_size = sizeof(ASV1Context),
318 .decode = decode_frame,
319 .capabilities = CODEC_CAP_DR1,
320 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
324 #if CONFIG_ASV2_DECODER
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"),