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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
198 lines
6.0 KiB
C
198 lines
6.0 KiB
C
/*
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* Electronic Arts TQI Video Decoder
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* Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Electronic Arts TQI Video Decoder
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* @author Peter Ross <pross@xvid.org>
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* @see http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
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*/
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#include "libavutil/mem_internal.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "bswapdsp.h"
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#include "codec_internal.h"
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#include "get_bits.h"
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#include "aandcttab.h"
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#include "eaidct.h"
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#include "idctdsp.h"
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#include "internal.h"
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#include "mpeg12data.h"
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#include "mpeg12dec.h"
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typedef struct TqiContext {
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AVCodecContext *avctx;
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GetBitContext gb;
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BlockDSPContext bdsp;
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BswapDSPContext bsdsp;
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IDCTDSPContext idsp;
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ScanTable intra_scantable;
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void *bitstream_buf;
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unsigned int bitstream_buf_size;
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int mb_x, mb_y;
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uint16_t intra_matrix[64];
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int last_dc[3];
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DECLARE_ALIGNED(32, int16_t, block)[6][64];
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} TqiContext;
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static av_cold int tqi_decode_init(AVCodecContext *avctx)
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{
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TqiContext *t = avctx->priv_data;
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ff_blockdsp_init(&t->bdsp, avctx);
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ff_bswapdsp_init(&t->bsdsp);
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ff_idctdsp_init(&t->idsp, avctx);
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ff_init_scantable_permutation(t->idsp.idct_permutation, FF_IDCT_PERM_NONE);
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ff_init_scantable(t->idsp.idct_permutation, &t->intra_scantable, ff_zigzag_direct);
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avctx->framerate = (AVRational){ 15, 1 };
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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ff_mpeg12_init_vlcs();
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return 0;
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}
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static int tqi_decode_mb(TqiContext *t, int16_t (*block)[64])
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{
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int n;
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t->bdsp.clear_blocks(block[0]);
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for (n = 0; n < 6; n++) {
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int ret = ff_mpeg1_decode_block_intra(&t->gb,
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t->intra_matrix,
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t->intra_scantable.permutated,
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t->last_dc, block[n], n, 1);
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if (ret < 0) {
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av_log(t->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
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t->mb_x, t->mb_y);
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return ret;
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}
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}
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return 0;
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}
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static inline void tqi_idct_put(AVCodecContext *avctx, AVFrame *frame,
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int16_t (*block)[64])
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{
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TqiContext *t = avctx->priv_data;
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ptrdiff_t linesize = frame->linesize[0];
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uint8_t *dest_y = frame->data[0] + t->mb_y * 16 * linesize + t->mb_x * 16;
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uint8_t *dest_cb = frame->data[1] + t->mb_y * 8 * frame->linesize[1] + t->mb_x * 8;
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uint8_t *dest_cr = frame->data[2] + t->mb_y * 8 * frame->linesize[2] + t->mb_x * 8;
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ff_ea_idct_put_c(dest_y , linesize, block[0]);
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ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
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ff_ea_idct_put_c(dest_y + 8*linesize , linesize, block[2]);
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ff_ea_idct_put_c(dest_y + 8*linesize + 8, linesize, block[3]);
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if (!(avctx->flags & AV_CODEC_FLAG_GRAY)) {
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ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
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ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
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}
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}
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static void tqi_calculate_qtable(TqiContext *t, int quant)
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{
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const int64_t qscale = (215 - 2*quant)*5;
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int i;
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t->intra_matrix[0] = (ff_inv_aanscales[0] * ff_mpeg1_default_intra_matrix[0]) >> 11;
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for(i=1; i<64; i++)
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t->intra_matrix[i] = (ff_inv_aanscales[i] * ff_mpeg1_default_intra_matrix[i] * qscale + 32) >> 14;
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}
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static int tqi_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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const uint8_t *buf_end = buf+buf_size;
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TqiContext *t = avctx->priv_data;
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AVFrame *frame = data;
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int ret, w, h;
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if (buf_size < 12)
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return AVERROR_INVALIDDATA;
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t->avctx = avctx;
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w = AV_RL16(&buf[0]);
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h = AV_RL16(&buf[2]);
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tqi_calculate_qtable(t, buf[4]);
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buf += 8;
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ret = ff_set_dimensions(avctx, w, h);
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if (ret < 0)
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return ret;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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av_fast_padded_malloc(&t->bitstream_buf, &t->bitstream_buf_size,
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buf_end - buf);
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if (!t->bitstream_buf)
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return AVERROR(ENOMEM);
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t->bsdsp.bswap_buf(t->bitstream_buf, (const uint32_t *) buf,
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(buf_end - buf) / 4);
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init_get_bits(&t->gb, t->bitstream_buf, 8 * (buf_end - buf));
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t->last_dc[0] =
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t->last_dc[1] =
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t->last_dc[2] = 0;
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for (t->mb_y = 0; t->mb_y < (h + 15) / 16; t->mb_y++) {
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for (t->mb_x = 0; t->mb_x < (w + 15) / 16; t->mb_x++) {
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if (tqi_decode_mb(t, t->block) < 0)
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goto end;
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tqi_idct_put(avctx, frame, t->block);
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}
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}
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end:
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int tqi_decode_end(AVCodecContext *avctx)
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{
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TqiContext *t = avctx->priv_data;
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av_freep(&t->bitstream_buf);
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return 0;
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}
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const FFCodec ff_eatqi_decoder = {
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.p.name = "eatqi",
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.p.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_TQI,
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.priv_data_size = sizeof(TqiContext),
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.init = tqi_decode_init,
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.close = tqi_decode_end,
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.decode = tqi_decode_frame,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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