| /* |
| * Sierra VMD video decoder |
| * Copyright (c) 2004 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 |
| * Sierra VMD video decoder |
| * by Vladimir "VAG" Gneushev (vagsoft at mail.ru) |
| * for more information on the Sierra VMD format, visit: |
| * http://www.pcisys.net/~melanson/codecs/ |
| * |
| * The video decoder outputs PAL8 colorspace data. The decoder expects |
| * a 0x330-byte VMD file header to be transmitted via extradata during |
| * codec initialization. Each encoded frame that is sent to this decoder |
| * is expected to be prepended with the appropriate 16-byte frame |
| * information record from the VMD file. |
| */ |
| |
| #include <string.h> |
| |
| #include "libavutil/common.h" |
| #include "libavutil/intreadwrite.h" |
| |
| #include "avcodec.h" |
| #include "internal.h" |
| #include "bytestream.h" |
| |
| #define VMD_HEADER_SIZE 0x330 |
| #define PALETTE_COUNT 256 |
| |
| typedef struct VmdVideoContext { |
| |
| AVCodecContext *avctx; |
| AVFrame *prev_frame; |
| |
| const unsigned char *buf; |
| int size; |
| |
| unsigned char palette[PALETTE_COUNT * 4]; |
| unsigned char *unpack_buffer; |
| int unpack_buffer_size; |
| |
| int x_off, y_off; |
| } VmdVideoContext; |
| |
| #define QUEUE_SIZE 0x1000 |
| #define QUEUE_MASK 0x0FFF |
| |
| static int lz_unpack(const unsigned char *src, int src_len, |
| unsigned char *dest, int dest_len) |
| { |
| unsigned char *d; |
| unsigned char *d_end; |
| unsigned char queue[QUEUE_SIZE]; |
| unsigned int qpos; |
| unsigned int dataleft; |
| unsigned int chainofs; |
| unsigned int chainlen; |
| unsigned int speclen; |
| unsigned char tag; |
| unsigned int i, j; |
| GetByteContext gb; |
| |
| bytestream2_init(&gb, src, src_len); |
| d = dest; |
| d_end = d + dest_len; |
| dataleft = bytestream2_get_le32(&gb); |
| memset(queue, 0x20, QUEUE_SIZE); |
| if (bytestream2_get_bytes_left(&gb) < 4) |
| return AVERROR_INVALIDDATA; |
| if (bytestream2_peek_le32(&gb) == 0x56781234) { |
| bytestream2_skipu(&gb, 4); |
| qpos = 0x111; |
| speclen = 0xF + 3; |
| } else { |
| qpos = 0xFEE; |
| speclen = 100; /* no speclen */ |
| } |
| |
| while (dataleft > 0 && bytestream2_get_bytes_left(&gb) > 0) { |
| tag = bytestream2_get_byteu(&gb); |
| if ((tag == 0xFF) && (dataleft > 8)) { |
| if (d_end - d < 8 || bytestream2_get_bytes_left(&gb) < 8) |
| return AVERROR_INVALIDDATA; |
| for (i = 0; i < 8; i++) { |
| queue[qpos++] = *d++ = bytestream2_get_byteu(&gb); |
| qpos &= QUEUE_MASK; |
| } |
| dataleft -= 8; |
| } else { |
| for (i = 0; i < 8; i++) { |
| if (dataleft == 0) |
| break; |
| if (tag & 0x01) { |
| if (d_end - d < 1 || bytestream2_get_bytes_left(&gb) < 1) |
| return AVERROR_INVALIDDATA; |
| queue[qpos++] = *d++ = bytestream2_get_byteu(&gb); |
| qpos &= QUEUE_MASK; |
| dataleft--; |
| } else { |
| chainofs = bytestream2_get_byte(&gb); |
| chainofs |= ((bytestream2_peek_byte(&gb) & 0xF0) << 4); |
| chainlen = (bytestream2_get_byte(&gb) & 0x0F) + 3; |
| if (chainlen == speclen) { |
| chainlen = bytestream2_get_byte(&gb) + 0xF + 3; |
| } |
| if (d_end - d < chainlen) |
| return AVERROR_INVALIDDATA; |
| for (j = 0; j < chainlen; j++) { |
| *d = queue[chainofs++ & QUEUE_MASK]; |
| queue[qpos++] = *d++; |
| qpos &= QUEUE_MASK; |
| } |
| dataleft -= chainlen; |
| } |
| tag >>= 1; |
| } |
| } |
| } |
| return d - dest; |
| } |
| static int rle_unpack(const unsigned char *src, unsigned char *dest, |
| int src_count, int src_size, int dest_len) |
| { |
| unsigned char *pd; |
| int i, l, used = 0; |
| unsigned char *dest_end = dest + dest_len; |
| GetByteContext gb; |
| uint16_t run_val; |
| |
| bytestream2_init(&gb, src, src_size); |
| pd = dest; |
| if (src_count & 1) { |
| if (bytestream2_get_bytes_left(&gb) < 1) |
| return 0; |
| *pd++ = bytestream2_get_byteu(&gb); |
| used++; |
| } |
| |
| do { |
| if (bytestream2_get_bytes_left(&gb) < 1) |
| break; |
| l = bytestream2_get_byteu(&gb); |
| if (l & 0x80) { |
| l = (l & 0x7F) * 2; |
| if (dest_end - pd < l || bytestream2_get_bytes_left(&gb) < l) |
| return bytestream2_tell(&gb); |
| bytestream2_get_bufferu(&gb, pd, l); |
| pd += l; |
| } else { |
| if (dest_end - pd < 2*l || bytestream2_get_bytes_left(&gb) < 2) |
| return bytestream2_tell(&gb); |
| run_val = bytestream2_get_ne16(&gb); |
| for (i = 0; i < l; i++) { |
| AV_WN16(pd, run_val); |
| pd += 2; |
| } |
| l *= 2; |
| } |
| used += l; |
| } while (used < src_count); |
| |
| return bytestream2_tell(&gb); |
| } |
| |
| static int vmd_decode(VmdVideoContext *s, AVFrame *frame) |
| { |
| int i; |
| unsigned int *palette32; |
| unsigned char r, g, b; |
| |
| GetByteContext gb; |
| |
| unsigned char meth; |
| unsigned char *dp; /* pointer to current frame */ |
| unsigned char *pp; /* pointer to previous frame */ |
| unsigned char len; |
| int ofs; |
| |
| int frame_x, frame_y; |
| int frame_width, frame_height; |
| |
| frame_x = AV_RL16(&s->buf[6]); |
| frame_y = AV_RL16(&s->buf[8]); |
| frame_width = AV_RL16(&s->buf[10]) - frame_x + 1; |
| frame_height = AV_RL16(&s->buf[12]) - frame_y + 1; |
| |
| if ((frame_width == s->avctx->width && frame_height == s->avctx->height) && |
| (frame_x || frame_y)) { |
| |
| s->x_off = frame_x; |
| s->y_off = frame_y; |
| } |
| frame_x -= s->x_off; |
| frame_y -= s->y_off; |
| |
| if (frame_x < 0 || frame_width < 0 || |
| frame_x >= s->avctx->width || |
| frame_width > s->avctx->width || |
| frame_x + frame_width > s->avctx->width) { |
| av_log(s->avctx, AV_LOG_ERROR, |
| "Invalid horizontal range %d-%d\n", |
| frame_x, frame_width); |
| return AVERROR_INVALIDDATA; |
| } |
| if (frame_y < 0 || frame_height < 0 || |
| frame_y >= s->avctx->height || |
| frame_height > s->avctx->height || |
| frame_y + frame_height > s->avctx->height) { |
| av_log(s->avctx, AV_LOG_ERROR, |
| "Invalid vertical range %d-%d\n", |
| frame_y, frame_height); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* if only a certain region will be updated, copy the entire previous |
| * frame before the decode */ |
| if (s->prev_frame->data[0] && |
| (frame_x || frame_y || (frame_width != s->avctx->width) || |
| (frame_height != s->avctx->height))) { |
| |
| memcpy(frame->data[0], s->prev_frame->data[0], |
| s->avctx->height * frame->linesize[0]); |
| } |
| |
| /* check if there is a new palette */ |
| bytestream2_init(&gb, s->buf + 16, s->size - 16); |
| if (s->buf[15] & 0x02) { |
| bytestream2_skip(&gb, 2); |
| palette32 = (unsigned int *)s->palette; |
| if (bytestream2_get_bytes_left(&gb) >= PALETTE_COUNT * 3) { |
| for (i = 0; i < PALETTE_COUNT; i++) { |
| r = bytestream2_get_byteu(&gb) * 4; |
| g = bytestream2_get_byteu(&gb) * 4; |
| b = bytestream2_get_byteu(&gb) * 4; |
| palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b); |
| palette32[i] |= palette32[i] >> 6 & 0x30303; |
| } |
| } else { |
| av_log(s->avctx, AV_LOG_ERROR, "Incomplete palette\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| if (!s->size) |
| return 0; |
| |
| /* originally UnpackFrame in VAG's code */ |
| if (bytestream2_get_bytes_left(&gb) < 1) |
| return AVERROR_INVALIDDATA; |
| meth = bytestream2_get_byteu(&gb); |
| if (meth & 0x80) { |
| int size; |
| if (!s->unpack_buffer_size) { |
| av_log(s->avctx, AV_LOG_ERROR, |
| "Trying to unpack LZ-compressed frame with no LZ buffer\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| size = lz_unpack(gb.buffer, bytestream2_get_bytes_left(&gb), |
| s->unpack_buffer, s->unpack_buffer_size); |
| if (size < 0) |
| return size; |
| meth &= 0x7F; |
| bytestream2_init(&gb, s->unpack_buffer, size); |
| } |
| |
| dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x]; |
| pp = &s->prev_frame->data[0][frame_y * s->prev_frame->linesize[0] + frame_x]; |
| switch (meth) { |
| case 1: |
| for (i = 0; i < frame_height; i++) { |
| ofs = 0; |
| do { |
| len = bytestream2_get_byte(&gb); |
| if (len & 0x80) { |
| len = (len & 0x7F) + 1; |
| if (ofs + len > frame_width || |
| bytestream2_get_bytes_left(&gb) < len) |
| return AVERROR_INVALIDDATA; |
| bytestream2_get_bufferu(&gb, &dp[ofs], len); |
| ofs += len; |
| } else { |
| /* interframe pixel copy */ |
| if (ofs + len + 1 > frame_width || !s->prev_frame->data[0]) |
| return AVERROR_INVALIDDATA; |
| memcpy(&dp[ofs], &pp[ofs], len + 1); |
| ofs += len + 1; |
| } |
| } while (ofs < frame_width); |
| if (ofs > frame_width) { |
| av_log(s->avctx, AV_LOG_ERROR, |
| "offset > width (%d > %d)\n", |
| ofs, frame_width); |
| return AVERROR_INVALIDDATA; |
| } |
| dp += frame->linesize[0]; |
| pp += s->prev_frame->linesize[0]; |
| } |
| break; |
| |
| case 2: |
| for (i = 0; i < frame_height; i++) { |
| bytestream2_get_buffer(&gb, dp, frame_width); |
| dp += frame->linesize[0]; |
| pp += s->prev_frame->linesize[0]; |
| } |
| break; |
| |
| case 3: |
| for (i = 0; i < frame_height; i++) { |
| ofs = 0; |
| do { |
| len = bytestream2_get_byte(&gb); |
| if (len & 0x80) { |
| len = (len & 0x7F) + 1; |
| if (bytestream2_peek_byte(&gb) == 0xFF) { |
| int slen = len; |
| bytestream2_get_byte(&gb); |
| len = rle_unpack(gb.buffer, &dp[ofs], |
| len, bytestream2_get_bytes_left(&gb), |
| frame_width - ofs); |
| ofs += slen; |
| bytestream2_skip(&gb, len); |
| } else { |
| if (ofs + len > frame_width || |
| bytestream2_get_bytes_left(&gb) < len) |
| return AVERROR_INVALIDDATA; |
| bytestream2_get_buffer(&gb, &dp[ofs], len); |
| ofs += len; |
| } |
| } else { |
| /* interframe pixel copy */ |
| if (ofs + len + 1 > frame_width || !s->prev_frame->data[0]) |
| return AVERROR_INVALIDDATA; |
| memcpy(&dp[ofs], &pp[ofs], len + 1); |
| ofs += len + 1; |
| } |
| } while (ofs < frame_width); |
| if (ofs > frame_width) { |
| av_log(s->avctx, AV_LOG_ERROR, |
| "offset > width (%d > %d)\n", |
| ofs, frame_width); |
| return AVERROR_INVALIDDATA; |
| } |
| dp += frame->linesize[0]; |
| pp += s->prev_frame->linesize[0]; |
| } |
| break; |
| } |
| return 0; |
| } |
| |
| static av_cold int vmdvideo_decode_end(AVCodecContext *avctx) |
| { |
| VmdVideoContext *s = avctx->priv_data; |
| |
| av_frame_free(&s->prev_frame); |
| av_freep(&s->unpack_buffer); |
| s->unpack_buffer_size = 0; |
| |
| return 0; |
| } |
| |
| static av_cold int vmdvideo_decode_init(AVCodecContext *avctx) |
| { |
| VmdVideoContext *s = avctx->priv_data; |
| int i; |
| unsigned int *palette32; |
| int palette_index = 0; |
| unsigned char r, g, b; |
| unsigned char *vmd_header; |
| unsigned char *raw_palette; |
| |
| s->avctx = avctx; |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| |
| /* make sure the VMD header made it */ |
| if (s->avctx->extradata_size != VMD_HEADER_SIZE) { |
| av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n", |
| VMD_HEADER_SIZE); |
| return AVERROR_INVALIDDATA; |
| } |
| vmd_header = (unsigned char *)avctx->extradata; |
| |
| s->unpack_buffer_size = AV_RL32(&vmd_header[800]); |
| if (s->unpack_buffer_size) { |
| s->unpack_buffer = av_malloc(s->unpack_buffer_size); |
| if (!s->unpack_buffer) |
| return AVERROR(ENOMEM); |
| } |
| |
| /* load up the initial palette */ |
| raw_palette = &vmd_header[28]; |
| palette32 = (unsigned int *)s->palette; |
| for (i = 0; i < PALETTE_COUNT; i++) { |
| r = raw_palette[palette_index++] * 4; |
| g = raw_palette[palette_index++] * 4; |
| b = raw_palette[palette_index++] * 4; |
| palette32[i] = 0xFFU << 24 | (r << 16) | (g << 8) | (b); |
| palette32[i] |= palette32[i] >> 6 & 0x30303; |
| } |
| |
| s->prev_frame = av_frame_alloc(); |
| if (!s->prev_frame) { |
| vmdvideo_decode_end(avctx); |
| return AVERROR(ENOMEM); |
| } |
| |
| return 0; |
| } |
| |
| static int vmdvideo_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| VmdVideoContext *s = avctx->priv_data; |
| AVFrame *frame = data; |
| int ret; |
| |
| s->buf = buf; |
| s->size = buf_size; |
| |
| if (buf_size < 16) |
| return AVERROR_INVALIDDATA; |
| |
| if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
| return ret; |
| |
| if ((ret = vmd_decode(s, frame)) < 0) |
| return ret; |
| |
| /* make the palette available on the way out */ |
| memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4); |
| |
| /* shuffle frames */ |
| av_frame_unref(s->prev_frame); |
| if ((ret = av_frame_ref(s->prev_frame, frame)) < 0) |
| return ret; |
| |
| *got_frame = 1; |
| |
| /* report that the buffer was completely consumed */ |
| return buf_size; |
| } |
| |
| AVCodec ff_vmdvideo_decoder = { |
| .name = "vmdvideo", |
| .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_VMDVIDEO, |
| .priv_data_size = sizeof(VmdVideoContext), |
| .init = vmdvideo_decode_init, |
| .close = vmdvideo_decode_end, |
| .decode = vmdvideo_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
