Electronic Arts TQI decoder

Originally committed as revision 17002 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 166 insertions, 0 deletions

diff --git a/libavcodec/eatqi.c b/libavcodec/eatqi.c
new file mode 100644
index 0000000000..67b9478753
--- /dev/null
+++ b/libavcodec/eatqi.c
@@ -0,0 +1,166 @@
+/*
+ * Electronic Arts TQI Video Decoder
+ * Copyright (c) 2007-2009 Peter Ross <pross@xvid.org>
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * @file eatqi.c
+ * Electronic Arts TQI Video Decoder
+ * by Peter Ross <pross@xvid.org>
+ *
+ * Technical details here:
+ * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TQI
+ */
+
+#include "avcodec.h"
+#include "bitstream.h"
+#include "dsputil.h"
+#include "aandcttab.h"
+#include "mpeg12.h"
+#include "mpegvideo.h"
+
+typedef struct TqiContext {
+    MpegEncContext s;
+    AVFrame frame;
+    uint8_t *bitstream_buf;
+    unsigned int bitstream_buf_size;
+} TqiContext;
+
+static av_cold int tqi_decode_init(AVCodecContext *avctx)
+{
+    TqiContext *t = avctx->priv_data;
+    MpegEncContext *s = &t->s;
+    s->avctx = avctx;
+    if(avctx->idct_algo==FF_IDCT_AUTO)
+        avctx->idct_algo=FF_IDCT_EA;
+    dsputil_init(&s->dsp, avctx);
+    ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
+    s->qscale = 1;
+    avctx->time_base = (AVRational){1, 15};
+    avctx->pix_fmt = PIX_FMT_YUV420P;
+    ff_mpeg12_init_vlcs();
+    return 0;
+}
+
+static void tqi_decode_mb(MpegEncContext *s, DCTELEM (*block)[64])
+{
+    int n;
+    s->dsp.clear_blocks(block);
+    for (n=0; n<6; n++)
+        ff_mpeg1_decode_block_intra(s, block[n], n);
+}
+
+static inline void tqi_idct_put(TqiContext *t, DCTELEM (*block)[64])
+{
+    MpegEncContext *s = &t->s;
+    int linesize= t->frame.linesize[0];
+    uint8_t *dest_y  = t->frame.data[0] + (s->mb_y * 16* linesize            ) + s->mb_x * 16;
+    uint8_t *dest_cb = t->frame.data[1] + (s->mb_y * 8 * t->frame.linesize[1]) + s->mb_x * 8;
+    uint8_t *dest_cr = t->frame.data[2] + (s->mb_y * 8 * t->frame.linesize[2]) + s->mb_x * 8;
+
+    s->dsp.idct_put(dest_y                 , linesize, block[0]);
+    s->dsp.idct_put(dest_y              + 8, linesize, block[1]);
+    s->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
+    s->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
+    if(!(s->avctx->flags&CODEC_FLAG_GRAY)) {
+        s->dsp.idct_put(dest_cb, t->frame.linesize[1], block[4]);
+        s->dsp.idct_put(dest_cr, t->frame.linesize[2], block[5]);
+    }
+}
+
+static void tqi_calculate_qtable(MpegEncContext *s, int quant)
+{
+    const int qscale = (215 - 2*quant)*5;
+    int i;
+    if (s->avctx->idct_algo==FF_IDCT_EA) {
+        s->intra_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0])>>11;
+        for(i=1; i<64; i++)
+            s->intra_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>14;
+    }else{
+        s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
+        for(i=1; i<64; i++)
+            s->intra_matrix[i] = (ff_mpeg1_default_intra_matrix[i]*qscale + 32)>>3;
+    }
+}
+
+static int tqi_decode_frame(AVCodecContext *avctx,
+                            void *data, int *data_size,
+                            const uint8_t *buf, int buf_size)
+{
+    const uint8_t *buf_end = buf+buf_size;
+    TqiContext *t = avctx->priv_data;
+    MpegEncContext *s = &t->s;
+    DECLARE_ALIGNED_16(DCTELEM, block[6][64]);
+
+    s->width  = AV_RL16(&buf[0]);
+    s->height = AV_RL16(&buf[2]);
+    tqi_calculate_qtable(s, buf[4]);
+    buf += 8;
+
+    if (t->frame.data[0])
+        avctx->release_buffer(avctx, &t->frame);
+
+    if (s->avctx->width!=s->width || s->avctx->height!=s->height)
+        avcodec_set_dimensions(s->avctx, s->width, s->height);
+
+    if(avctx->get_buffer(avctx, &t->frame) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+
+    t->bitstream_buf = av_fast_realloc(t->bitstream_buf, &t->bitstream_buf_size, (buf_end-buf) + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!t->bitstream_buf)
+        return -1;
+    s->dsp.bswap_buf((uint32_t*)t->bitstream_buf, (const uint32_t*)buf, (buf_end-buf)/4);
+    init_get_bits(&s->gb, t->bitstream_buf, 8*(buf_end-buf));
+
+    s->last_dc[0] = s->last_dc[1] = s->last_dc[2] = 0;
+    for (s->mb_y=0; s->mb_y<(avctx->height+15)/16; s->mb_y++)
+    for (s->mb_x=0; s->mb_x<(avctx->width+15)/16; s->mb_x++)
+    {
+        tqi_decode_mb(s, block);
+        tqi_idct_put(t, block);
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = t->frame;
+    return buf_size;
+}
+
+static av_cold int tqi_decode_end(AVCodecContext *avctx)
+{
+    TqiContext *t = avctx->priv_data;
+    if(t->frame.data[0])
+        avctx->release_buffer(avctx, &t->frame);
+    av_free(t->bitstream_buf);
+    return 0;
+}
+
+AVCodec eatqi_decoder = {
+    "eatqi",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_TQI,
+    sizeof(TqiContext),
+    tqi_decode_init,
+    NULL,
+    tqi_decode_end,
+    tqi_decode_frame,
+    CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TQI Video"),
+};