paf: split audio and video decoder

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 386 insertions, 0 deletions

diff --git a/libavcodec/pafvideo.c b/libavcodec/pafvideo.c
new file mode 100644
index 0000000000..650d036945
--- /dev/null
+++ b/libavcodec/pafvideo.c
@@ -0,0 +1,386 @@
+/*
+ * Packed Animation File video decoder
+ * Copyright (c) 2012 Paul B Mahol
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/imgutils.h"
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "copy_block.h"
+#include "internal.h"
+
+static const uint8_t block_sequences[16][8] = {
+    { 0, 0, 0, 0, 0, 0, 0, 0 }, { 2, 0, 0, 0, 0, 0, 0, 0 },
+    { 5, 7, 0, 0, 0, 0, 0, 0 }, { 5, 0, 0, 0, 0, 0, 0, 0 },
+    { 6, 0, 0, 0, 0, 0, 0, 0 }, { 5, 7, 5, 7, 0, 0, 0, 0 },
+    { 5, 7, 5, 0, 0, 0, 0, 0 }, { 5, 7, 6, 0, 0, 0, 0, 0 },
+    { 5, 5, 0, 0, 0, 0, 0, 0 }, { 3, 0, 0, 0, 0, 0, 0, 0 },
+    { 6, 6, 0, 0, 0, 0, 0, 0 }, { 2, 4, 0, 0, 0, 0, 0, 0 },
+    { 2, 4, 5, 7, 0, 0, 0, 0 }, { 2, 4, 5, 0, 0, 0, 0, 0 },
+    { 2, 4, 6, 0, 0, 0, 0, 0 }, { 2, 4, 5, 7, 5, 7, 0, 0 },
+};
+
+typedef struct PAFVideoDecContext {
+    AVFrame  *pic;
+    GetByteContext gb;
+
+    int width;
+    int height;
+
+    int current_frame;
+    uint8_t *frame[4];
+    int frame_size;
+    int video_size;
+
+    uint8_t *opcodes;
+} PAFVideoDecContext;
+
+static av_cold int paf_video_close(AVCodecContext *avctx)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    int i;
+
+    av_frame_free(&c->pic);
+
+    for (i = 0; i < 4; i++)
+        av_freep(&c->frame[i]);
+
+    return 0;
+}
+
+static av_cold int paf_video_init(AVCodecContext *avctx)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    int i;
+
+    c->width  = avctx->width;
+    c->height = avctx->height;
+
+    if (avctx->height & 3 || avctx->width & 3) {
+        av_log(avctx, AV_LOG_ERROR,
+               "width %d and height %d must be multiplie of 4.\n",
+               avctx->width, avctx->height);
+        return AVERROR_INVALIDDATA;
+    }
+
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    c->pic = av_frame_alloc();
+    if (!c->pic)
+        return AVERROR(ENOMEM);
+
+    c->frame_size = avctx->width * FFALIGN(avctx->height, 256);
+    c->video_size = avctx->width * avctx->height;
+    for (i = 0; i < 4; i++) {
+        c->frame[i] = av_mallocz(c->frame_size);
+        if (!c->frame[i]) {
+            paf_video_close(avctx);
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    return 0;
+}
+
+static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width)
+{
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        bytestream2_get_buffer(&c->gb, dst, 4);
+        dst += width;
+    }
+}
+
+static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color)
+{
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        if (mask & (1 << 7 - i))
+            dst[i] = color;
+        if (mask & (1 << 3 - i))
+            dst[width + i] = color;
+    }
+}
+
+static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src)
+{
+    int i;
+
+    for (i = 0; i < 4; i++) {
+        if (mask & (1 << 7 - i))
+            dst[i] = src[i];
+        if (mask & (1 << 3 - i))
+            dst[width + i] = src[width + i];
+    }
+}
+
+static void set_src_position(PAFVideoDecContext *c,
+                             const uint8_t **p,
+                             const uint8_t **pend)
+{
+    int val  = bytestream2_get_be16(&c->gb);
+    int page = val >> 14;
+    int x    = (val & 0x7F);
+    int y    = ((val >> 7) & 0x7F);
+
+    *p    = c->frame[page] + x * 2 + y * 2 * c->width;
+    *pend = c->frame[page] + c->frame_size;
+}
+
+static int decode_0(PAFVideoDecContext *c, uint8_t *pkt, uint8_t code)
+{
+    uint32_t opcode_size, offset;
+    uint8_t *dst, *dend, mask = 0, color = 0;
+    const uint8_t *src, *send, *opcodes;
+    int i, j, op = 0;
+
+    i = bytestream2_get_byte(&c->gb);
+    if (i) {
+        if (code & 0x10) {
+            int pos = bytestream2_tell(&c->gb) & 3;
+            if (pos)
+                bytestream2_skip(&c->gb, 4 - pos);
+        }
+        do {
+            int page, val, x, y;
+            val    = bytestream2_get_be16(&c->gb);
+            page   = val >> 14;
+            x      = (val & 0x7F) * 2;
+            y      = ((val >> 7) & 0x7F) * 2;
+            dst    = c->frame[page] + x + y * c->width;
+            dend   = c->frame[page] + c->frame_size;
+            offset = (x & 0x7F) * 2;
+            j      = bytestream2_get_le16(&c->gb) + offset;
+            do {
+                offset++;
+                if (dst + 3 * c->width + 4 > dend)
+                    return AVERROR_INVALIDDATA;
+                read4x4block(c, dst, c->width);
+                if ((offset & 0x3F) == 0)
+                    dst += c->width * 3;
+                dst += 4;
+            } while (offset < j);
+        } while (--i);
+    }
+
+    dst  = c->frame[c->current_frame];
+    dend = c->frame[c->current_frame] + c->frame_size;
+    do {
+        set_src_position(c, &src, &send);
+        if ((src + 3 * c->width + 4 > send) ||
+            (dst + 3 * c->width + 4 > dend))
+            return AVERROR_INVALIDDATA;
+        copy_block4(dst, src, c->width, c->width, 4);
+        i++;
+        if ((i & 0x3F) == 0)
+            dst += c->width * 3;
+        dst += 4;
+    } while (i < c->video_size / 16);
+
+    opcode_size = bytestream2_get_le16(&c->gb);
+    bytestream2_skip(&c->gb, 2);
+
+    if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
+        return AVERROR_INVALIDDATA;
+
+    opcodes = pkt + bytestream2_tell(&c->gb);
+    bytestream2_skipu(&c->gb, opcode_size);
+
+    dst = c->frame[c->current_frame];
+
+    for (i = 0; i < c->height; i += 4, dst += c->width * 3)
+        for (j = 0; j < c->width; j += 4, dst += 4) {
+            int opcode, k = 0;
+            if (op > opcode_size)
+                return AVERROR_INVALIDDATA;
+            if (j & 4) {
+                opcode = opcodes[op] & 15;
+                op++;
+            } else {
+                opcode = opcodes[op] >> 4;
+            }
+
+            while (block_sequences[opcode][k]) {
+                offset = c->width * 2;
+                code   = block_sequences[opcode][k++];
+
+                switch (code) {
+                case 2:
+                    offset = 0;
+                case 3:
+                    color = bytestream2_get_byte(&c->gb);
+                case 4:
+                    mask = bytestream2_get_byte(&c->gb);
+                    copy_color_mask(dst + offset, c->width, mask, color);
+                    break;
+                case 5:
+                    offset = 0;
+                case 6:
+                    set_src_position(c, &src, &send);
+                case 7:
+                    if (src + offset + c->width + 4 > send)
+                        return AVERROR_INVALIDDATA;
+                    mask = bytestream2_get_byte(&c->gb);
+                    copy_src_mask(dst + offset, c->width, mask, src + offset);
+                    break;
+                }
+            }
+        }
+
+    return 0;
+}
+
+static int paf_video_decode(AVCodecContext *avctx, void *data,
+                            int *got_frame, AVPacket *pkt)
+{
+    PAFVideoDecContext *c = avctx->priv_data;
+    uint8_t code, *dst, *end;
+    int i, frame, ret;
+
+    if ((ret = ff_reget_buffer(avctx, c->pic)) < 0)
+        return ret;
+
+    bytestream2_init(&c->gb, pkt->data, pkt->size);
+
+    code = bytestream2_get_byte(&c->gb);
+    if (code & 0x20) {  // frame is keyframe
+        for (i = 0; i < 4; i++)
+            memset(c->frame[i], 0, c->frame_size);
+
+        memset(c->pic->data[1], 0, AVPALETTE_SIZE);
+        c->current_frame  = 0;
+        c->pic->key_frame = 1;
+        c->pic->pict_type = AV_PICTURE_TYPE_I;
+    } else {
+        c->pic->key_frame = 0;
+        c->pic->pict_type = AV_PICTURE_TYPE_P;
+    }
+
+    if (code & 0x40) {  // palette update
+        uint32_t *out = (uint32_t *)c->pic->data[1];
+        int index, count;
+
+        index = bytestream2_get_byte(&c->gb);
+        count = bytestream2_get_byte(&c->gb) + 1;
+
+        if (index + count > 256)
+            return AVERROR_INVALIDDATA;
+        if (bytestream2_get_bytes_left(&c->gb) < 3 * count)
+            return AVERROR_INVALIDDATA;
+
+        out += index;
+        for (i = 0; i < count; i++) {
+            unsigned r, g, b;
+
+            r = bytestream2_get_byteu(&c->gb);
+            r = r << 2 | r >> 4;
+            g = bytestream2_get_byteu(&c->gb);
+            g = g << 2 | g >> 4;
+            b = bytestream2_get_byteu(&c->gb);
+            b = b << 2 | b >> 4;
+            *out++ = (0xFFU << 24) | (r << 16) | (g << 8) | b;
+        }
+        c->pic->palette_has_changed = 1;
+    }
+
+    switch (code & 0x0F) {
+    case 0:
+        /* Block-based motion compensation using 4x4 blocks with either
+         * horizontal or vertical vectors; might incorporate VQ as well. */
+        if ((ret = decode_0(c, pkt->data, code)) < 0)
+            return ret;
+        break;
+    case 1:
+        /* Uncompressed data. This mode specifies that (width * height) bytes
+         * should be copied directly from the encoded buffer into the output. */
+        dst = c->frame[c->current_frame];
+        // possibly chunk length data
+        bytestream2_skip(&c->gb, 2);
+        if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
+            return AVERROR_INVALIDDATA;
+        bytestream2_get_bufferu(&c->gb, dst, c->video_size);
+        break;
+    case 2:
+        /* Copy reference frame: Consume the next byte in the stream as the
+         * reference frame (which should be 0, 1, 2, or 3, and should not be
+         * the same as the current frame number). */
+        frame = bytestream2_get_byte(&c->gb);
+        if (frame > 3)
+            return AVERROR_INVALIDDATA;
+        if (frame != c->current_frame)
+            memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
+        break;
+    case 4:
+        /* Run length encoding.*/
+        dst = c->frame[c->current_frame];
+        end = dst + c->video_size;
+
+        bytestream2_skip(&c->gb, 2);
+
+        while (dst < end) {
+            int8_t code;
+            int count;
+
+            if (bytestream2_get_bytes_left(&c->gb) < 2)
+                return AVERROR_INVALIDDATA;
+
+            code  = bytestream2_get_byteu(&c->gb);
+            count = FFABS(code) + 1;
+
+            if (dst + count > end)
+                return AVERROR_INVALIDDATA;
+            if (code < 0)
+                memset(dst, bytestream2_get_byteu(&c->gb), count);
+            else
+                bytestream2_get_buffer(&c->gb, dst, count);
+            dst += count;
+        }
+        break;
+    default:
+        avpriv_request_sample(avctx, "unknown/invalid code");
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_image_copy_plane(c->pic->data[0], c->pic->linesize[0],
+                        c->frame[c->current_frame], c->width,
+                        c->width, c->height);
+
+    c->current_frame = (c->current_frame + 1) & 3;
+    if ((ret = av_frame_ref(data, c->pic)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    return pkt->size;
+}
+
+AVCodec ff_paf_video_decoder = {
+    .name           = "paf_video",
+    .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_PAF_VIDEO,
+    .priv_data_size = sizeof(PAFVideoDecContext),
+    .init           = paf_video_init,
+    .close          = paf_video_close,
+    .decode         = paf_video_decode,
+    .capabilities   = CODEC_CAP_DR1,
+};