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, DCTELEM 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, DCTELEM 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, DCTELEM block[6][64])
168 a->dsp.clear_blocks(block[0]);
170 if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
171 for (i = 0; i < 6; i++) {
172 if (asv1_decode_block(a, block[i]) < 0)
176 for (i = 0; i < 6; i++) {
177 if (asv2_decode_block(a, block[i]) < 0)
184 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y)
186 DCTELEM (*block)[64] = a->block;
187 int linesize = a->picture.linesize[0];
189 uint8_t *dest_y = a->picture.data[0] + (mb_y * 16* linesize ) + mb_x * 16;
190 uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
191 uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
193 a->dsp.idct_put(dest_y , linesize, block[0]);
194 a->dsp.idct_put(dest_y + 8, linesize, block[1]);
195 a->dsp.idct_put(dest_y + 8*linesize , linesize, block[2]);
196 a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
198 if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
199 a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
200 a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
204 static int decode_frame(AVCodecContext *avctx,
205 void *data, int *got_frame,
208 ASV1Context * const a = avctx->priv_data;
209 const uint8_t *buf = avpkt->data;
210 int buf_size = avpkt->size;
211 AVFrame *picture = data;
212 AVFrame * const p = &a->picture;
216 avctx->release_buffer(avctx, p);
219 if ((ret = ff_get_buffer(avctx, p)) < 0) {
220 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
223 p->pict_type = AV_PICTURE_TYPE_I;
226 av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
228 if (!a->bitstream_buffer)
229 return AVERROR(ENOMEM);
231 if (avctx->codec_id == AV_CODEC_ID_ASV1)
232 a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
235 for (i = 0; i < buf_size; i++)
236 a->bitstream_buffer[i] = ff_reverse[buf[i]];
239 init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
241 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
242 for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
243 if ((ret = decode_mb(a, a->block)) < 0)
246 idct_put(a, mb_x, mb_y);
250 if (a->mb_width2 != a->mb_width) {
252 for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
253 if ((ret = decode_mb(a, a->block)) < 0)
256 idct_put(a, mb_x, mb_y);
260 if (a->mb_height2 != a->mb_height) {
261 mb_y = a->mb_height2;
262 for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
263 if ((ret = decode_mb(a, a->block)) < 0)
266 idct_put(a, mb_x, mb_y);
270 *picture = a->picture;
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 AVFrame *p = &a->picture;
282 const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
285 ff_asv_common_init(avctx);
287 ff_init_scantable(a->dsp.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] / a->inv_qscale;
304 p->qstride = a->mb_width;
305 p->qscale_table = av_malloc(p->qstride * a->mb_height);
306 p->quality = (32 * scale + a->inv_qscale / 2) / a->inv_qscale;
307 memset(p->qscale_table, p->quality, p->qstride * a->mb_height);
312 static av_cold int decode_end(AVCodecContext *avctx)
314 ASV1Context * const a = avctx->priv_data;
316 av_freep(&a->bitstream_buffer);
317 av_freep(&a->picture.qscale_table);
318 a->bitstream_buffer_size = 0;
320 if (a->picture.data[0])
321 avctx->release_buffer(avctx, &a->picture);
326 #if CONFIG_ASV1_DECODER
327 AVCodec ff_asv1_decoder = {
329 .type = AVMEDIA_TYPE_VIDEO,
330 .id = AV_CODEC_ID_ASV1,
331 .priv_data_size = sizeof(ASV1Context),
334 .decode = decode_frame,
335 .capabilities = CODEC_CAP_DR1,
336 .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
340 #if CONFIG_ASV2_DECODER
341 AVCodec ff_asv2_decoder = {
343 .type = AVMEDIA_TYPE_VIDEO,
344 .id = AV_CODEC_ID_ASV2,
345 .priv_data_size = sizeof(ASV1Context),
348 .decode = decode_frame,
349 .capabilities = CODEC_CAP_DR1,
350 .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),