| /* |
| * Copyright (c) 2003 Michael Niedermayer |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * ASUS V1/V2 decoder. |
| */ |
| |
| #include "libavutil/attributes.h" |
| #include "libavutil/mem.h" |
| |
| #include "asv.h" |
| #include "avcodec.h" |
| #include "blockdsp.h" |
| #include "idctdsp.h" |
| #include "internal.h" |
| #include "mathops.h" |
| #include "mpeg12data.h" |
| |
| #define VLC_BITS 6 |
| #define ASV2_LEVEL_VLC_BITS 10 |
| |
| static VLC ccp_vlc; |
| static VLC level_vlc; |
| static VLC dc_ccp_vlc; |
| static VLC ac_ccp_vlc; |
| static VLC asv2_level_vlc; |
| |
| static av_cold void init_vlcs(ASV1Context *a) |
| { |
| static int done = 0; |
| |
| if (!done) { |
| done = 1; |
| |
| INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17, |
| &ff_asv_ccp_tab[0][1], 2, 1, |
| &ff_asv_ccp_tab[0][0], 2, 1, 64); |
| INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8, |
| &ff_asv_dc_ccp_tab[0][1], 2, 1, |
| &ff_asv_dc_ccp_tab[0][0], 2, 1, 64); |
| INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16, |
| &ff_asv_ac_ccp_tab[0][1], 2, 1, |
| &ff_asv_ac_ccp_tab[0][0], 2, 1, 64); |
| INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7, |
| &ff_asv_level_tab[0][1], 2, 1, |
| &ff_asv_level_tab[0][0], 2, 1, 64); |
| INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63, |
| &ff_asv2_level_tab[0][1], 2, 1, |
| &ff_asv2_level_tab[0][0], 2, 1, 1024); |
| } |
| } |
| |
| // FIXME write a reversed bitstream reader to avoid the double reverse |
| static inline int asv2_get_bits(GetBitContext *gb, int n) |
| { |
| return ff_reverse[get_bits(gb, n) << (8 - n)]; |
| } |
| |
| static inline int asv1_get_level(GetBitContext *gb) |
| { |
| int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1); |
| |
| if (code == 3) |
| return get_sbits(gb, 8); |
| else |
| return code - 3; |
| } |
| |
| static inline int asv2_get_level(GetBitContext *gb) |
| { |
| int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1); |
| |
| if (code == 31) |
| return (int8_t) asv2_get_bits(gb, 8); |
| else |
| return code - 31; |
| } |
| |
| static inline int asv1_decode_block(ASV1Context *a, int16_t block[64]) |
| { |
| int i; |
| |
| block[0] = 8 * get_bits(&a->gb, 8); |
| |
| for (i = 0; i < 11; i++) { |
| const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1); |
| |
| if (ccp) { |
| if (ccp == 16) |
| break; |
| if (ccp < 0 || i >= 10) { |
| av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (ccp & 8) |
| block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4; |
| if (ccp & 4) |
| block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4; |
| if (ccp & 2) |
| block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4; |
| if (ccp & 1) |
| block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static inline int asv2_decode_block(ASV1Context *a, int16_t block[64]) |
| { |
| int i, count, ccp; |
| |
| count = asv2_get_bits(&a->gb, 4); |
| |
| block[0] = 8 * asv2_get_bits(&a->gb, 8); |
| |
| ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1); |
| if (ccp) { |
| if (ccp & 4) |
| block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4; |
| if (ccp & 2) |
| block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4; |
| if (ccp & 1) |
| block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4; |
| } |
| |
| for (i = 1; i < count + 1; i++) { |
| const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1); |
| |
| if (ccp) { |
| if (ccp & 8) |
| block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4; |
| if (ccp & 4) |
| block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4; |
| if (ccp & 2) |
| block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4; |
| if (ccp & 1) |
| block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static inline int decode_mb(ASV1Context *a, int16_t block[6][64]) |
| { |
| int i; |
| |
| a->bdsp.clear_blocks(block[0]); |
| |
| if (a->avctx->codec_id == AV_CODEC_ID_ASV1) { |
| for (i = 0; i < 6; i++) { |
| if (asv1_decode_block(a, block[i]) < 0) |
| return -1; |
| } |
| } else { |
| for (i = 0; i < 6; i++) { |
| if (asv2_decode_block(a, block[i]) < 0) |
| return -1; |
| } |
| } |
| return 0; |
| } |
| |
| static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y) |
| { |
| int16_t(*block)[64] = a->block; |
| int linesize = frame->linesize[0]; |
| |
| uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16; |
| uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8; |
| uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8; |
| |
| a->idsp.idct_put(dest_y, linesize, block[0]); |
| a->idsp.idct_put(dest_y + 8, linesize, block[1]); |
| a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]); |
| a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]); |
| |
| if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
| a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]); |
| a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]); |
| } |
| } |
| |
| static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| ASV1Context *const a = avctx->priv_data; |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| AVFrame *const p = data; |
| int mb_x, mb_y, ret; |
| |
| if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| return ret; |
| p->pict_type = AV_PICTURE_TYPE_I; |
| p->key_frame = 1; |
| |
| av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, |
| buf_size); |
| if (!a->bitstream_buffer) |
| return AVERROR(ENOMEM); |
| |
| if (avctx->codec_id == AV_CODEC_ID_ASV1) { |
| a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer, |
| (const uint32_t *) buf, buf_size / 4); |
| } else { |
| int i; |
| for (i = 0; i < buf_size; i++) |
| a->bitstream_buffer[i] = ff_reverse[buf[i]]; |
| } |
| |
| init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8); |
| |
| for (mb_y = 0; mb_y < a->mb_height2; mb_y++) { |
| for (mb_x = 0; mb_x < a->mb_width2; mb_x++) { |
| if ((ret = decode_mb(a, a->block)) < 0) |
| return ret; |
| |
| idct_put(a, p, mb_x, mb_y); |
| } |
| } |
| |
| if (a->mb_width2 != a->mb_width) { |
| mb_x = a->mb_width2; |
| for (mb_y = 0; mb_y < a->mb_height2; mb_y++) { |
| if ((ret = decode_mb(a, a->block)) < 0) |
| return ret; |
| |
| idct_put(a, p, mb_x, mb_y); |
| } |
| } |
| |
| if (a->mb_height2 != a->mb_height) { |
| mb_y = a->mb_height2; |
| for (mb_x = 0; mb_x < a->mb_width; mb_x++) { |
| if ((ret = decode_mb(a, a->block)) < 0) |
| return ret; |
| |
| idct_put(a, p, mb_x, mb_y); |
| } |
| } |
| |
| *got_frame = 1; |
| |
| emms_c(); |
| |
| return (get_bits_count(&a->gb) + 31) / 32 * 4; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| ASV1Context *const a = avctx->priv_data; |
| const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2; |
| int i; |
| |
| if (avctx->extradata_size < 1) { |
| av_log(avctx, AV_LOG_WARNING, "No extradata provided\n"); |
| } |
| |
| ff_asv_common_init(avctx); |
| ff_blockdsp_init(&a->bdsp, avctx); |
| ff_idctdsp_init(&a->idsp, avctx); |
| init_vlcs(a); |
| ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab); |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| |
| if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) { |
| av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n"); |
| if (avctx->codec_id == AV_CODEC_ID_ASV1) |
| a->inv_qscale = 6; |
| else |
| a->inv_qscale = 10; |
| } |
| |
| for (i = 0; i < 64; i++) { |
| int index = ff_asv_scantab[i]; |
| |
| a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / |
| a->inv_qscale; |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| ASV1Context *const a = avctx->priv_data; |
| |
| av_freep(&a->bitstream_buffer); |
| a->bitstream_buffer_size = 0; |
| |
| return 0; |
| } |
| |
| #if CONFIG_ASV1_DECODER |
| AVCodec ff_asv1_decoder = { |
| .name = "asv1", |
| .long_name = NULL_IF_CONFIG_SMALL("ASUS V1"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_ASV1, |
| .priv_data_size = sizeof(ASV1Context), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
| |
| #if CONFIG_ASV2_DECODER |
| AVCodec ff_asv2_decoder = { |
| .name = "asv2", |
| .long_name = NULL_IF_CONFIG_SMALL("ASUS V2"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_ASV2, |
| .priv_data_size = sizeof(ASV1Context), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
