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"
38 #define ASV2_LEVEL_VLC_BITS 10
42 static VLC dc_ccp_vlc;
43 static VLC ac_ccp_vlc;
44 static VLC asv2_level_vlc;
46 static av_cold void init_vlcs(ASV1Context *a)
53 INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
54 &ff_asv_ccp_tab[0][1], 2, 1,
55 &ff_asv_ccp_tab[0][0], 2, 1, 64);
56 INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
57 &ff_asv_dc_ccp_tab[0][1], 2, 1,
58 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
59 INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
60 &ff_asv_ac_ccp_tab[0][1], 2, 1,
61 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
62 INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
63 &ff_asv_level_tab[0][1], 2, 1,
64 &ff_asv_level_tab[0][0], 2, 1, 64);
65 INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
66 &ff_asv2_level_tab[0][1], 2, 1,
67 &ff_asv2_level_tab[0][0], 2, 1, 1024);
71 // FIXME write a reversed bitstream reader to avoid the double reverse
72 static inline int asv2_get_bits(GetBitContext *gb, int n)
74 return ff_reverse[get_bits(gb, n) << (8 - n)];
77 static inline int asv1_get_level(GetBitContext *gb)
79 int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
82 return get_sbits(gb, 8);
87 static inline int asv2_get_level(GetBitContext *gb)
89 int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
92 return (int8_t) asv2_get_bits(gb, 8);
97 static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
101 block[0] = 8 * get_bits(&a->gb, 8);
103 for (i = 0; i < 11; i++) {
104 const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
109 if (ccp < 0 || i >= 10) {
110 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
111 return AVERROR_INVALIDDATA;
115 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
117 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
119 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
121 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
128 static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
132 count = asv2_get_bits(&a->gb, 4);
134 block[0] = 8 * asv2_get_bits(&a->gb, 8);
136 ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
139 block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
141 block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
143 block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
146 for (i = 1; i < count + 1; i++) {
147 const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
151 block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
153 block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
155 block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
157 block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
164 static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
168 a->bdsp.clear_blocks(block[0]);
170 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
171 for (i = 0; i < 6; i++) {
172 if ((ret = asv1_decode_block(a, block[i])) < 0)
176 for (i = 0; i < 6; i++) {
177 if ((ret = asv2_decode_block(a, block[i])) < 0)
184 static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
186 int16_t(*block)[64] = a->block;
187 int linesize = frame->linesize[0];
189 uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
190 uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
191 uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
193 a->idsp.idct_put(dest_y, linesize, block[0]);
194 a->idsp.idct_put(dest_y + 8, linesize, block[1]);
195 a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
196 a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
198 if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
199 a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
200 a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
204 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
207 ASV1Context *const a = avctx->priv_data;
208 const uint8_t *buf = avpkt->data;
209 int buf_size = avpkt->size;
210 AVFrame *const p = data;
213 if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
214 return AVERROR_INVALIDDATA;
216 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
218 p->pict_type = AV_PICTURE_TYPE_I;
221 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
223 if (!a->bitstream_buffer)
224 return AVERROR(ENOMEM);
226 if (avctx->codec_id == AV_CODEC_ID_ASV1) {
227 a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
228 (const uint32_t *) buf, buf_size / 4);
231 for (i = 0; i < buf_size; i++)
232 a->bitstream_buffer[i] = ff_reverse[buf[i]];
235 init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);
237 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
238 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
239 if ((ret = decode_mb(a, a->block)) < 0)
242 idct_put(a, p, mb_x, mb_y);
246 if (a->mb_width2 != a->mb_width) {
248 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
249 if ((ret = decode_mb(a, a->block)) < 0)
252 idct_put(a, p, mb_x, mb_y);
256 if (a->mb_height2 != a->mb_height) {
257 mb_y = a->mb_height2;
258 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
259 if ((ret = decode_mb(a, a->block)) < 0)
262 idct_put(a, p, mb_x, mb_y);
270 return (get_bits_count(&a->gb) + 31) / 32 * 4;
273 static av_cold int decode_init(AVCodecContext *avctx)
275 ASV1Context *const a = avctx->priv_data;
276 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
279 if (avctx->extradata_size < 1) {
280 av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
283 ff_asv_common_init(avctx);
284 ff_blockdsp_init(&a->bdsp, avctx);
285 ff_idctdsp_init(&a->idsp, avctx);
287 ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
288 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
290 if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
291 av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
292 if (avctx->codec_id == AV_CODEC_ID_ASV1)
298 for (i = 0; i < 64; i++) {
299 int index = ff_asv_scantab[i];
301 a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
308 static av_cold int decode_end(AVCodecContext *avctx)
310 ASV1Context *const a = avctx->priv_data;
312 av_freep(&a->bitstream_buffer);
313 a->bitstream_buffer_size = 0;
318 #if CONFIG_ASV1_DECODER
319 AVCodec ff_asv1_decoder = {
321 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
322 .type = AVMEDIA_TYPE_VIDEO,
323 .id = AV_CODEC_ID_ASV1,
324 .priv_data_size = sizeof(ASV1Context),
327 .decode = decode_frame,
328 .capabilities = AV_CODEC_CAP_DR1,
332 #if CONFIG_ASV2_DECODER
333 AVCodec ff_asv2_decoder = {
335 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
336 .type = AVMEDIA_TYPE_VIDEO,
337 .id = AV_CODEC_ID_ASV2,
338 .priv_data_size = sizeof(ASV1Context),
341 .decode = decode_frame,
342 .capabilities = AV_CODEC_CAP_DR1,