| /* |
| * 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]; |
| switch (s->vqa_version) { |
| case 1: |
| case 2: |
| break; |
| case 3: |
| avpriv_report_missing_feature(avctx, "VQA Version %d", s->vqa_version); |
| return AVERROR_PATCHWELCOME; |
| default: |
| avpriv_request_sample(avctx, "VQA Version %i", 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_mallocz(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; |
| |
| if (src_size < 0 || src_size > bytestream2_get_bytes_left(&s->gb)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Chunk size %d is out of range\n", |
| src_size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| start = bytestream2_tell(&s->gb); |
| while (bytestream2_tell(&s->gb) - start < src_size) { |
| opcode = bytestream2_get_byte(&s->gb); |
| ff_tlog(s->avctx, "opcode %02X: ", opcode); |
| |
| /* 0x80 means that frame is finished */ |
| if (opcode == 0x80) |
| break; |
| |
| 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); |
| ff_tlog(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); |
| ff_tlog(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); |
| ff_tlog(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; |
| ff_tlog(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); |
| ff_tlog(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); |
| memset(dest + dest_index, 0, dest_size - dest_index); |
| } |
| |
| 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", |
| .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"), |
| .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 = AV_CODEC_CAP_DR1, |
| }; |
