adding ffmpeg specific version

1 files changed, 254 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/mdec.c b/ffmpeg1/libavcodec/mdec.c
new file mode 100644
index 0000000..8fb29ce
--- /dev/null
+++ b/ffmpeg1/libavcodec/mdec.c
@@ -0,0 +1,254 @@
+/*
+ * Sony PlayStation MDEC (Motion DECoder)
+ * Copyright (c) 2003 Michael Niedermayer
+ *
+ * based upon code from Sebastian Jedruszkiewicz <elf@frogger.rules.pl>
+ *
+ * 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
+ * Sony PlayStation MDEC (Motion DECoder)
+ * This is very similar to intra-only MPEG-1.
+ */
+
+#include "avcodec.h"
+#include "mpegvideo.h"
+#include "mpeg12.h"
+#include "thread.h"
+
+typedef struct MDECContext {
+    AVCodecContext *avctx;
+    DSPContext dsp;
+    ThreadFrame frame;
+    GetBitContext gb;
+    ScanTable scantable;
+    int version;
+    int qscale;
+    int last_dc[3];
+    int mb_width;
+    int mb_height;
+    int mb_x, mb_y;
+    DECLARE_ALIGNED(16, int16_t, block)[6][64];
+    uint8_t *bitstream_buffer;
+    unsigned int bitstream_buffer_size;
+    int block_last_index[6];
+} MDECContext;
+
+//very similar to MPEG-1
+static inline int mdec_decode_block_intra(MDECContext *a, int16_t *block, int n)
+{
+    int level, diff, i, j, run;
+    int component;
+    RLTable *rl = &ff_rl_mpeg1;
+    uint8_t * const scantable = a->scantable.permutated;
+    const uint16_t *quant_matrix = ff_mpeg1_default_intra_matrix;
+    const int qscale = a->qscale;
+
+    /* DC coefficient */
+    if (a->version == 2) {
+        block[0] = 2 * get_sbits(&a->gb, 10) + 1024;
+    } else {
+        component = (n <= 3 ? 0 : n - 4 + 1);
+        diff = decode_dc(&a->gb, component);
+        if (diff >= 0xffff)
+            return AVERROR_INVALIDDATA;
+        a->last_dc[component] += diff;
+        block[0] = a->last_dc[component] << 3;
+    }
+
+    i = 0;
+    {
+        OPEN_READER(re, &a->gb);
+        /* now quantify & encode AC coefficients */
+        for (;;) {
+            UPDATE_CACHE(re, &a->gb);
+            GET_RL_VLC(level, run, re, &a->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
+
+            if (level == 127) {
+                break;
+            } else if (level != 0) {
+                i    += run;
+                j     = scantable[i];
+                level = (level * qscale * quant_matrix[j]) >> 3;
+                level = (level ^ SHOW_SBITS(re, &a->gb, 1)) - SHOW_SBITS(re, &a->gb, 1);
+                LAST_SKIP_BITS(re, &a->gb, 1);
+            } else {
+                /* escape */
+                run = SHOW_UBITS(re, &a->gb, 6)+1; LAST_SKIP_BITS(re, &a->gb, 6);
+                UPDATE_CACHE(re, &a->gb);
+                level = SHOW_SBITS(re, &a->gb, 10); SKIP_BITS(re, &a->gb, 10);
+                i    += run;
+                j     = scantable[i];
+                if (level < 0) {
+                    level = -level;
+                    level = (level * qscale * quant_matrix[j]) >> 3;
+                    level = (level - 1) | 1;
+                    level = -level;
+                } else {
+                    level = (level * qscale * quant_matrix[j]) >> 3;
+                    level = (level - 1) | 1;
+                }
+            }
+            if (i > 63) {
+                av_log(a->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", a->mb_x, a->mb_y);
+                return AVERROR_INVALIDDATA;
+            }
+
+            block[j] = level;
+        }
+        CLOSE_READER(re, &a->gb);
+    }
+    a->block_last_index[n] = i;
+    return 0;
+}
+
+static inline int decode_mb(MDECContext *a, int16_t block[6][64])
+{
+    int i, ret;
+    const int block_index[6] = { 5, 4, 0, 1, 2, 3 };
+
+    a->dsp.clear_blocks(block[0]);
+
+    for (i = 0; i < 6; i++) {
+        if ((ret = mdec_decode_block_intra(a, block[block_index[i]],
+                                           block_index[i])) < 0)
+            return ret;
+        if (get_bits_left(&a->gb) < 0)
+            return AVERROR_INVALIDDATA;
+    }
+    return 0;
+}
+
+static inline void idct_put(MDECContext *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->dsp.idct_put(dest_y,                    linesize, block[0]);
+    a->dsp.idct_put(dest_y                + 8, linesize, block[1]);
+    a->dsp.idct_put(dest_y + 8 * linesize,     linesize, block[2]);
+    a->dsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
+
+    if (!(a->avctx->flags & CODEC_FLAG_GRAY)) {
+        a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]);
+        a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]);
+    }
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *got_frame,
+                        AVPacket *avpkt)
+{
+    MDECContext * const a = avctx->priv_data;
+    const uint8_t *buf    = avpkt->data;
+    int buf_size          = avpkt->size;
+    ThreadFrame frame     = { .f = data };
+    int i, ret;
+
+    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
+        return ret;
+    frame.f->pict_type = AV_PICTURE_TYPE_I;
+    frame.f->key_frame = 1;
+
+    av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!a->bitstream_buffer)
+        return AVERROR(ENOMEM);
+    for (i = 0; i < buf_size; i += 2) {
+        a->bitstream_buffer[i]     = buf[i + 1];
+        a->bitstream_buffer[i + 1] = buf[i];
+    }
+    init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);
+
+    /* skip over 4 preamble bytes in stream (typically 0xXX 0xXX 0x00 0x38) */
+    skip_bits(&a->gb, 32);
+
+    a->qscale  = get_bits(&a->gb, 16);
+    a->version = get_bits(&a->gb, 16);
+
+    a->last_dc[0] = a->last_dc[1] = a->last_dc[2] = 128;
+
+    for (a->mb_x = 0; a->mb_x < a->mb_width; a->mb_x++) {
+        for (a->mb_y = 0; a->mb_y < a->mb_height; a->mb_y++) {
+            if ((ret = decode_mb(a, a->block)) < 0)
+                return ret;
+
+            idct_put(a, frame.f, a->mb_x, a->mb_y);
+        }
+    }
+
+    *got_frame = 1;
+
+    return (get_bits_count(&a->gb) + 31) / 32 * 4;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    MDECContext * const a = avctx->priv_data;
+
+    a->mb_width  = (avctx->coded_width  + 15) / 16;
+    a->mb_height = (avctx->coded_height + 15) / 16;
+
+    a->avctx           = avctx;
+
+    ff_dsputil_init(&a->dsp, avctx);
+    ff_mpeg12_init_vlcs();
+    ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_zigzag_direct);
+
+    if (avctx->idct_algo == FF_IDCT_AUTO)
+        avctx->idct_algo = FF_IDCT_SIMPLE;
+    avctx->pix_fmt  = AV_PIX_FMT_YUVJ420P;
+
+    return 0;
+}
+
+static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
+{
+    MDECContext * const a = avctx->priv_data;
+
+    a->avctx           = avctx;
+
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    MDECContext * const a = avctx->priv_data;
+
+    av_freep(&a->bitstream_buffer);
+    a->bitstream_buffer_size = 0;
+
+    return 0;
+}
+
+AVCodec ff_mdec_decoder = {
+    .name             = "mdec",
+    .type             = AVMEDIA_TYPE_VIDEO,
+    .id               = AV_CODEC_ID_MDEC,
+    .priv_data_size   = sizeof(MDECContext),
+    .init             = decode_init,
+    .close            = decode_end,
+    .decode           = decode_frame,
+    .capabilities     = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
+    .long_name        = NULL_IF_CONFIG_SMALL("Sony PlayStation MDEC (Motion DECoder)"),
+    .init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy)
+};