adding ffmpeg specific version

1 files changed, 639 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/vqavideo.c b/ffmpeg1/libavcodec/vqavideo.c
new file mode 100644
index 0000000..a47e2db
--- /dev/null
+++ b/ffmpeg1/libavcodec/vqavideo.c
@@ -0,0 +1,639 @@
+/*
+ * Westwood Studios VQA Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * 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
+ * VQA Video Decoder
+ * @author Mike Melanson (melanson@pcisys.net)
+ * @see http://wiki.multimedia.cx/index.php?title=VQA
+ *
+ * The VQA video decoder outputs PAL8 or RGB555 colorspace data, depending
+ * on the type of data in the file.
+ *
+ * This decoder needs the 42-byte VQHD header from the beginning
+ * of the VQA file passed through the extradata field. The VQHD header
+ * is laid out as:
+ *
+ *   bytes 0-3   chunk fourcc: 'VQHD'
+ *   bytes 4-7   chunk size in big-endian format, should be 0x0000002A
+ *   bytes 8-49  VQHD chunk data
+ *
+ * Bytes 8-49 are what this decoder expects to see.
+ *
+ * Briefly, VQA is a vector quantized animation format that operates in a
+ * VGA palettized colorspace. It operates on pixel vectors (blocks)
+ * of either 4x2 or 4x4 in size. Compressed VQA chunks can contain vector
+ * codebooks, palette information, and code maps for rendering vectors onto
+ * frames. Any of these components can also be compressed with a run-length
+ * encoding (RLE) algorithm commonly referred to as "format80".
+ *
+ * VQA takes a novel approach to rate control. Each group of n frames
+ * (usually, n = 8) relies on a different vector codebook. Rather than
+ * transporting an entire codebook every 8th frame, the new codebook is
+ * broken up into 8 pieces and sent along with the compressed video chunks
+ * for each of the 8 frames preceding the 8 frames which require the
+ * codebook. A full codebook is also sent on the very first frame of a
+ * file. This is an interesting technique, although it makes random file
+ * seeking difficult despite the fact that the frames are all intracoded.
+ *
+ * V1,2 VQA uses 12-bit codebook indexes. If the 12-bit indexes were
+ * packed into bytes and then RLE compressed, bytewise, the results would
+ * be poor. That is why the coding method divides each index into 2 parts,
+ * the top 4 bits and the bottom 8 bits, then RL encodes the 4-bit pieces
+ * together and the 8-bit pieces together. If most of the vectors are
+ * clustered into one group of 256 vectors, most of the 4-bit index pieces
+ * should be the same.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+#define PALETTE_COUNT 256
+#define VQA_HEADER_SIZE 0x2A
+
+/* allocate the maximum vector space, regardless of the file version:
+ * (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
+#define MAX_CODEBOOK_VECTORS 0xFF00
+#define SOLID_PIXEL_VECTORS 0x100
+#define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
+#define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4)
+
+#define CBF0_TAG MKBETAG('C', 'B', 'F', '0')
+#define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z')
+#define CBP0_TAG MKBETAG('C', 'B', 'P', '0')
+#define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z')
+#define CPL0_TAG MKBETAG('C', 'P', 'L', '0')
+#define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z')
+#define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z')
+
+typedef struct VqaContext {
+
+    AVCodecContext *avctx;
+    GetByteContext gb;
+
+    uint32_t palette[PALETTE_COUNT];
+
+    int width;   /* width of a frame */
+    int height;   /* height of a frame */
+    int vector_width;  /* width of individual vector */
+    int vector_height;  /* height of individual vector */
+    int vqa_version;  /* this should be either 1, 2 or 3 */
+
+    unsigned char *codebook;         /* the current codebook */
+    int codebook_size;
+    unsigned char *next_codebook_buffer;  /* accumulator for next codebook */
+    int next_codebook_buffer_index;
+
+    unsigned char *decode_buffer;
+    int decode_buffer_size;
+
+    /* number of frames to go before replacing codebook */
+    int partial_countdown;
+    int partial_count;
+
+} VqaContext;
+
+static av_cold int vqa_decode_init(AVCodecContext *avctx)
+{
+    VqaContext *s = avctx->priv_data;
+    int i, j, codebook_index, ret;
+
+    s->avctx = avctx;
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+
+    /* make sure the extradata made it */
+    if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
+        av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n", VQA_HEADER_SIZE);
+        return AVERROR(EINVAL);
+    }
+
+    /* load up the VQA parameters from the header */
+    s->vqa_version = s->avctx->extradata[0];
+    if (s->vqa_version < 1 || s->vqa_version > 3) {
+        av_log(s->avctx, AV_LOG_ERROR, "unsupported version %d\n", s->vqa_version);
+        return AVERROR_PATCHWELCOME;
+    }
+    s->width = AV_RL16(&s->avctx->extradata[6]);
+    s->height = AV_RL16(&s->avctx->extradata[8]);
+    if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0) {
+        s->width= s->height= 0;
+        return ret;
+    }
+    s->vector_width = s->avctx->extradata[10];
+    s->vector_height = s->avctx->extradata[11];
+    s->partial_count = s->partial_countdown = s->avctx->extradata[13];
+
+    /* the vector dimensions have to meet very stringent requirements */
+    if ((s->vector_width != 4) ||
+        ((s->vector_height != 2) && (s->vector_height != 4))) {
+        /* return without further initialization */
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (s->width % s->vector_width || s->height % s->vector_height) {
+        av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* allocate codebooks */
+    s->codebook_size = MAX_CODEBOOK_SIZE;
+    s->codebook = av_malloc(s->codebook_size);
+    if (!s->codebook)
+        goto fail;
+    s->next_codebook_buffer = av_malloc(s->codebook_size);
+    if (!s->next_codebook_buffer)
+        goto fail;
+
+    /* allocate decode buffer */
+    s->decode_buffer_size = (s->width / s->vector_width) *
+        (s->height / s->vector_height) * 2;
+    s->decode_buffer = av_malloc(s->decode_buffer_size);
+    if (!s->decode_buffer)
+        goto fail;
+
+    /* initialize the solid-color vectors */
+    if (s->vector_height == 4) {
+        codebook_index = 0xFF00 * 16;
+        for (i = 0; i < 256; i++)
+            for (j = 0; j < 16; j++)
+                s->codebook[codebook_index++] = i;
+    } else {
+        codebook_index = 0xF00 * 8;
+        for (i = 0; i < 256; i++)
+            for (j = 0; j < 8; j++)
+                s->codebook[codebook_index++] = i;
+    }
+    s->next_codebook_buffer_index = 0;
+
+    return 0;
+fail:
+    av_freep(&s->codebook);
+    av_freep(&s->next_codebook_buffer);
+    av_freep(&s->decode_buffer);
+    return AVERROR(ENOMEM);
+}
+
+#define CHECK_COUNT() \
+    if (dest_index + count > dest_size) { \
+        av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
+        av_log(s->avctx, AV_LOG_ERROR, "current dest_index = %d, count = %d, dest_size = %d\n", \
+            dest_index, count, dest_size); \
+        return AVERROR_INVALIDDATA; \
+    }
+
+#define CHECK_COPY(idx) \
+    if (idx < 0 || idx + count > dest_size) { \
+        av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
+        av_log(s->avctx, AV_LOG_ERROR, "current src_pos = %d, count = %d, dest_size = %d\n", \
+            src_pos, count, dest_size); \
+        return AVERROR_INVALIDDATA; \
+    }
+
+
+static int decode_format80(VqaContext *s, int src_size,
+    unsigned char *dest, int dest_size, int check_size) {
+
+    int dest_index = 0;
+    int count, opcode, start;
+    int src_pos;
+    unsigned char color;
+    int i;
+
+    start = bytestream2_tell(&s->gb);
+    while (bytestream2_tell(&s->gb) - start < src_size) {
+        opcode = bytestream2_get_byte(&s->gb);
+        av_dlog(s->avctx, "opcode %02X: ", opcode);
+
+        /* 0x80 means that frame is finished */
+        if (opcode == 0x80)
+            return 0;
+
+        if (dest_index >= dest_size) {
+            av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
+                dest_index, dest_size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        if (opcode == 0xFF) {
+
+            count   = bytestream2_get_le16(&s->gb);
+            src_pos = bytestream2_get_le16(&s->gb);
+            av_dlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos);
+            CHECK_COUNT();
+            CHECK_COPY(src_pos);
+            for (i = 0; i < count; i++)
+                dest[dest_index + i] = dest[src_pos + i];
+            dest_index += count;
+
+        } else if (opcode == 0xFE) {
+
+            count = bytestream2_get_le16(&s->gb);
+            color = bytestream2_get_byte(&s->gb);
+            av_dlog(s->avctx, "(2) set %X bytes to %02X\n", count, color);
+            CHECK_COUNT();
+            memset(&dest[dest_index], color, count);
+            dest_index += count;
+
+        } else if ((opcode & 0xC0) == 0xC0) {
+
+            count = (opcode & 0x3F) + 3;
+            src_pos = bytestream2_get_le16(&s->gb);
+            av_dlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos);
+            CHECK_COUNT();
+            CHECK_COPY(src_pos);
+            for (i = 0; i < count; i++)
+                dest[dest_index + i] = dest[src_pos + i];
+            dest_index += count;
+
+        } else if (opcode > 0x80) {
+
+            count = opcode & 0x3F;
+            av_dlog(s->avctx, "(4) copy %X bytes from source to dest\n", count);
+            CHECK_COUNT();
+            bytestream2_get_buffer(&s->gb, &dest[dest_index], count);
+            dest_index += count;
+
+        } else {
+
+            count = ((opcode & 0x70) >> 4) + 3;
+            src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8);
+            av_dlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos);
+            CHECK_COUNT();
+            CHECK_COPY(dest_index - src_pos);
+            for (i = 0; i < count; i++)
+                dest[dest_index + i] = dest[dest_index - src_pos + i];
+            dest_index += count;
+        }
+    }
+
+    /* validate that the entire destination buffer was filled; this is
+     * important for decoding frame maps since each vector needs to have a
+     * codebook entry; it is not important for compressed codebooks because
+     * not every entry needs to be filled */
+    if (check_size)
+        if (dest_index < dest_size)
+            av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
+                dest_index, dest_size);
+
+    return 0; // let's display what we decoded anyway
+}
+
+static int vqa_decode_chunk(VqaContext *s, AVFrame *frame)
+{
+    unsigned int chunk_type;
+    unsigned int chunk_size;
+    int byte_skip;
+    unsigned int index = 0;
+    int i;
+    unsigned char r, g, b;
+    int index_shift;
+    int res;
+
+    int cbf0_chunk = -1;
+    int cbfz_chunk = -1;
+    int cbp0_chunk = -1;
+    int cbpz_chunk = -1;
+    int cpl0_chunk = -1;
+    int cplz_chunk = -1;
+    int vptz_chunk = -1;
+
+    int x, y;
+    int lines = 0;
+    int pixel_ptr;
+    int vector_index = 0;
+    int lobyte = 0;
+    int hibyte = 0;
+    int lobytes = 0;
+    int hibytes = s->decode_buffer_size / 2;
+
+    /* first, traverse through the frame and find the subchunks */
+    while (bytestream2_get_bytes_left(&s->gb) >= 8) {
+
+        chunk_type = bytestream2_get_be32u(&s->gb);
+        index      = bytestream2_tell(&s->gb);
+        chunk_size = bytestream2_get_be32u(&s->gb);
+
+        switch (chunk_type) {
+
+        case CBF0_TAG:
+            cbf0_chunk = index;
+            break;
+
+        case CBFZ_TAG:
+            cbfz_chunk = index;
+            break;
+
+        case CBP0_TAG:
+            cbp0_chunk = index;
+            break;
+
+        case CBPZ_TAG:
+            cbpz_chunk = index;
+            break;
+
+        case CPL0_TAG:
+            cpl0_chunk = index;
+            break;
+
+        case CPLZ_TAG:
+            cplz_chunk = index;
+            break;
+
+        case VPTZ_TAG:
+            vptz_chunk = index;
+            break;
+
+        default:
+            av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %c%c%c%c (%08X)\n",
+            (chunk_type >> 24) & 0xFF,
+            (chunk_type >> 16) & 0xFF,
+            (chunk_type >>  8) & 0xFF,
+            (chunk_type >>  0) & 0xFF,
+            chunk_type);
+            break;
+        }
+
+        byte_skip = chunk_size & 0x01;
+        bytestream2_skip(&s->gb, chunk_size + byte_skip);
+    }
+
+    /* next, deal with the palette */
+    if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
+
+        /* a chunk should not have both chunk types */
+        av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* decompress the palette chunk */
+    if (cplz_chunk != -1) {
+
+/* yet to be handled */
+
+    }
+
+    /* convert the RGB palette into the machine's endian format */
+    if (cpl0_chunk != -1) {
+
+        bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
+        chunk_size = bytestream2_get_be32(&s->gb);
+        /* sanity check the palette size */
+        if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
+            av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n",
+                chunk_size / 3);
+            return AVERROR_INVALIDDATA;
+        }
+        for (i = 0; i < chunk_size / 3; i++) {
+            /* scale by 4 to transform 6-bit palette -> 8-bit */
+            r = bytestream2_get_byteu(&s->gb) * 4;
+            g = bytestream2_get_byteu(&s->gb) * 4;
+            b = bytestream2_get_byteu(&s->gb) * 4;
+            s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
+            s->palette[i] |= s->palette[i] >> 6 & 0x30303;
+        }
+    }
+
+    /* next, look for a full codebook */
+    if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
+
+        /* a chunk should not have both chunk types */
+        av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* decompress the full codebook chunk */
+    if (cbfz_chunk != -1) {
+
+        bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
+        chunk_size = bytestream2_get_be32(&s->gb);
+        if ((res = decode_format80(s, chunk_size, s->codebook,
+                                   s->codebook_size, 0)) < 0)
+            return res;
+    }
+
+    /* copy a full codebook */
+    if (cbf0_chunk != -1) {
+
+        bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
+        chunk_size = bytestream2_get_be32(&s->gb);
+        /* sanity check the full codebook size */
+        if (chunk_size > MAX_CODEBOOK_SIZE) {
+            av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n",
+                chunk_size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
+    }
+
+    /* decode the frame */
+    if (vptz_chunk == -1) {
+
+        /* something is wrong if there is no VPTZ chunk */
+        av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
+    chunk_size = bytestream2_get_be32(&s->gb);
+    if ((res = decode_format80(s, chunk_size,
+                               s->decode_buffer, s->decode_buffer_size, 1)) < 0)
+        return res;
+
+    /* render the final PAL8 frame */
+    if (s->vector_height == 4)
+        index_shift = 4;
+    else
+        index_shift = 3;
+    for (y = 0; y < s->height; y += s->vector_height) {
+        for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
+            pixel_ptr = y * frame->linesize[0] + x;
+
+            /* get the vector index, the method for which varies according to
+             * VQA file version */
+            switch (s->vqa_version) {
+
+            case 1:
+                lobyte = s->decode_buffer[lobytes * 2];
+                hibyte = s->decode_buffer[(lobytes * 2) + 1];
+                vector_index = ((hibyte << 8) | lobyte) >> 3;
+                vector_index <<= index_shift;
+                lines = s->vector_height;
+                /* uniform color fill - a quick hack */
+                if (hibyte == 0xFF) {
+                    while (lines--) {
+                        frame->data[0][pixel_ptr + 0] = 255 - lobyte;
+                        frame->data[0][pixel_ptr + 1] = 255 - lobyte;
+                        frame->data[0][pixel_ptr + 2] = 255 - lobyte;
+                        frame->data[0][pixel_ptr + 3] = 255 - lobyte;
+                        pixel_ptr += frame->linesize[0];
+                    }
+                    lines=0;
+                }
+                break;
+
+            case 2:
+                lobyte = s->decode_buffer[lobytes];
+                hibyte = s->decode_buffer[hibytes];
+                vector_index = (hibyte << 8) | lobyte;
+                vector_index <<= index_shift;
+                lines = s->vector_height;
+                break;
+
+            case 3:
+/* not implemented yet */
+                lines = 0;
+                break;
+            }
+
+            while (lines--) {
+                frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
+                frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
+                frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
+                frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
+                pixel_ptr += frame->linesize[0];
+            }
+        }
+    }
+
+    /* handle partial codebook */
+    if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
+        /* a chunk should not have both chunk types */
+        av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    if (cbp0_chunk != -1) {
+
+        bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
+        chunk_size = bytestream2_get_be32(&s->gb);
+
+        if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
+            av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n",
+                   chunk_size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        /* accumulate partial codebook */
+        bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
+                               chunk_size);
+        s->next_codebook_buffer_index += chunk_size;
+
+        s->partial_countdown--;
+        if (s->partial_countdown <= 0) {
+
+            /* time to replace codebook */
+            memcpy(s->codebook, s->next_codebook_buffer,
+                s->next_codebook_buffer_index);
+
+            /* reset accounting */
+            s->next_codebook_buffer_index = 0;
+            s->partial_countdown = s->partial_count;
+        }
+    }
+
+    if (cbpz_chunk != -1) {
+
+        bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
+        chunk_size = bytestream2_get_be32(&s->gb);
+
+        if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
+            av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n",
+                   chunk_size);
+            return AVERROR_INVALIDDATA;
+        }
+
+        /* accumulate partial codebook */
+        bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
+                               chunk_size);
+        s->next_codebook_buffer_index += chunk_size;
+
+        s->partial_countdown--;
+        if (s->partial_countdown <= 0) {
+            bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index);
+            /* decompress codebook */
+            if ((res = decode_format80(s, s->next_codebook_buffer_index,
+                                       s->codebook, s->codebook_size, 0)) < 0)
+                return res;
+
+            /* reset accounting */
+            s->next_codebook_buffer_index = 0;
+            s->partial_countdown = s->partial_count;
+        }
+    }
+
+    return 0;
+}
+
+static int vqa_decode_frame(AVCodecContext *avctx,
+                            void *data, int *got_frame,
+                            AVPacket *avpkt)
+{
+    VqaContext *s = avctx->priv_data;
+    AVFrame *frame = data;
+    int res;
+
+    if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
+        return res;
+
+    bytestream2_init(&s->gb, avpkt->data, avpkt->size);
+    if ((res = vqa_decode_chunk(s, frame)) < 0)
+        return res;
+
+    /* make the palette available on the way out */
+    memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
+    frame->palette_has_changed = 1;
+
+    *got_frame      = 1;
+
+    /* report that the buffer was completely consumed */
+    return avpkt->size;
+}
+
+static av_cold int vqa_decode_end(AVCodecContext *avctx)
+{
+    VqaContext *s = avctx->priv_data;
+
+    av_freep(&s->codebook);
+    av_freep(&s->next_codebook_buffer);
+    av_freep(&s->decode_buffer);
+
+    return 0;
+}
+
+AVCodec ff_vqa_decoder = {
+    .name           = "vqavideo",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_WS_VQA,
+    .priv_data_size = sizeof(VqaContext),
+    .init           = vqa_decode_init,
+    .close          = vqa_decode_end,
+    .decode         = vqa_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
+};