| /* |
| * Silicon Graphics Motion Video Compressor 1 & 2 decoder |
| * Copyright (c) 2012 Peter Ross |
| * |
| * 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 |
| * Silicon Graphics Motion Video Compressor 1 & 2 decoder |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| |
| typedef struct MvcContext { |
| AVFrame *frame; |
| int vflip; |
| } MvcContext; |
| |
| static av_cold int mvc_decode_init(AVCodecContext *avctx) |
| { |
| MvcContext *s = avctx->priv_data; |
| int width = avctx->width; |
| int height = avctx->height; |
| int ret; |
| |
| if (avctx->codec_id == AV_CODEC_ID_MVC1) { |
| width += 3; |
| height += 3; |
| } |
| width &= ~3; |
| height &= ~3; |
| if ((ret = ff_set_dimensions(avctx, width, height)) < 0) |
| return ret; |
| |
| avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555 |
| : AV_PIX_FMT_RGB32; |
| s->frame = av_frame_alloc(); |
| if (!s->frame) |
| return AVERROR(ENOMEM); |
| |
| s->vflip = avctx->extradata_size >= 9 && |
| !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9); |
| return 0; |
| } |
| |
| static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, |
| uint8_t *dst_start, int width, int height, int linesize) |
| { |
| uint8_t *dst; |
| uint16_t v[8]; |
| int mask, x, y, i; |
| |
| for (y = 0; y < height; y += 4) { |
| for (x = 0; x < width; x += 4) { |
| if (bytestream2_get_bytes_left(gb) < 6) |
| return 0; |
| |
| mask = bytestream2_get_be16u(gb); |
| v[0] = bytestream2_get_be16u(gb); |
| v[1] = bytestream2_get_be16u(gb); |
| if ((v[0] & 0x8000)) { |
| if (bytestream2_get_bytes_left(gb) < 12) { |
| av_log(avctx, AV_LOG_WARNING, "buffer overflow\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| for (i = 2; i < 8; i++) |
| v[i] = bytestream2_get_be16u(gb); |
| } else { |
| v[2] = v[4] = v[6] = v[0]; |
| v[3] = v[5] = v[7] = v[1]; |
| } |
| |
| #define PIX16(target, true, false) \ |
| i = (mask & target) ? true : false; \ |
| AV_WN16A(dst, v[i] & 0x7FFF); \ |
| dst += 2; |
| |
| #define ROW16(row, a1, a0, b1, b0) \ |
| dst = dst_start + (y + row) * linesize + x * 2; \ |
| PIX16(1 << (row * 4), a1, a0) \ |
| PIX16(1 << (row * 4 + 1), a1, a0) \ |
| PIX16(1 << (row * 4 + 2), b1, b0) \ |
| PIX16(1 << (row * 4 + 3), b1, b0) |
| |
| ROW16(0, 0, 1, 2, 3); |
| ROW16(1, 0, 1, 2, 3); |
| ROW16(2, 4, 5, 6, 7); |
| ROW16(3, 4, 5, 6, 7); |
| } |
| } |
| return 0; |
| } |
| |
| static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel) |
| { |
| int i, j; |
| for (j = 0; j < 4; j++) |
| for (i = 0; i < 4; i++) |
| AV_WN32A(dst + j * linesize + i * 4, pixel); |
| } |
| |
| #define PIX32(target, true, false) \ |
| AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \ |
| dst += 4; |
| |
| #define ROW32(row, a1, a0, b1, b0) \ |
| dst = dst_start + (y + row) * linesize + x * 4; \ |
| PIX32(1 << (row * 4), a1, a0) \ |
| PIX32(1 << (row * 4 + 1), a1, a0) \ |
| PIX32(1 << (row * 4 + 2), b1, b0) \ |
| PIX32(1 << (row * 4 + 3), b1, b0) |
| |
| #define MVC2_BLOCK \ |
| ROW32(0, 1, 0, 3, 2); \ |
| ROW32(1, 1, 0, 3, 2); \ |
| ROW32(2, 5, 4, 7, 6); \ |
| ROW32(3, 5, 4, 7, 6); |
| |
| static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, |
| uint8_t *dst_start, int width, int height, |
| int linesize, int vflip) |
| { |
| uint8_t *dst; |
| uint32_t color[128], v[8]; |
| int w, h, nb_colors, i, x, y, p0, p1, mask; |
| |
| if (bytestream2_get_bytes_left(gb) < 6) |
| return AVERROR_INVALIDDATA; |
| |
| w = bytestream2_get_be16u(gb); |
| h = bytestream2_get_be16u(gb); |
| if ((w & ~3) != width || (h & ~3) != height) |
| av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n"); |
| |
| if (bytestream2_get_byteu(gb)) { |
| avpriv_request_sample(avctx, "bitmap feature"); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| nb_colors = bytestream2_get_byteu(gb); |
| if (bytestream2_get_bytes_left(gb) < nb_colors * 3) |
| return AVERROR_INVALIDDATA; |
| for (i = 0; i < FFMIN(nb_colors, 128); i++) |
| color[i] = 0xFF000000 | bytestream2_get_be24u(gb); |
| if (nb_colors > 128) |
| bytestream2_skip(gb, (nb_colors - 128) * 3); |
| |
| if (vflip) { |
| dst_start += (height - 1) * linesize; |
| linesize = -linesize; |
| } |
| x = y = 0; |
| while (bytestream2_get_bytes_left(gb) >= 1) { |
| p0 = bytestream2_get_byteu(gb); |
| if ((p0 & 0x80)) { |
| if ((p0 & 0x40)) { |
| p0 &= 0x3F; |
| p0 = (p0 << 2) | (p0 >> 4); |
| set_4x4_block(dst_start + y * linesize + x * 4, linesize, |
| 0xFF000000 | (p0 << 16) | (p0 << 8) | p0); |
| } else { |
| int g, r; |
| p0 &= 0x3F; |
| p0 = (p0 << 2) | (p0 >> 4); |
| if (bytestream2_get_bytes_left(gb) < 2) |
| return AVERROR_INVALIDDATA; |
| g = bytestream2_get_byteu(gb); |
| r = bytestream2_get_byteu(gb); |
| set_4x4_block(dst_start + y * linesize + x * 4, linesize, |
| 0xFF000000 | (r << 16) | (g << 8) | p0); |
| } |
| } else { |
| if (bytestream2_get_bytes_left(gb) < 1) |
| return AVERROR_INVALIDDATA; |
| p1 = bytestream2_get_byteu(gb); |
| if ((p1 & 0x80)) { |
| if ((p0 & 0x7F) == (p1 & 0x7F)) { |
| set_4x4_block(dst_start + y * linesize + x * 4, linesize, |
| color[p0 & 0x7F]); |
| } else { |
| if (bytestream2_get_bytes_left(gb) < 2) |
| return AVERROR_INVALIDDATA; |
| v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F]; |
| v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F]; |
| mask = bytestream2_get_le16u(gb); |
| MVC2_BLOCK |
| } |
| } else { |
| if (bytestream2_get_bytes_left(gb) < 8) |
| return AVERROR_INVALIDDATA; |
| v[0] = color[p0 & 0x7F]; |
| v[1] = color[p1 & 0x7F]; |
| for (i = 2; i < 8; i++) |
| v[i] = color[bytestream2_get_byteu(gb) & 0x7F]; |
| mask = bytestream2_get_le16u(gb); |
| MVC2_BLOCK |
| } |
| } |
| |
| x += 4; |
| if (x >= width) { |
| y += 4; |
| if (y >= height) |
| break; |
| x = 0; |
| } |
| } |
| return 0; |
| } |
| |
| static int mvc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| MvcContext *s = avctx->priv_data; |
| GetByteContext gb; |
| int ret; |
| |
| if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
| return ret; |
| |
| bytestream2_init(&gb, avpkt->data, avpkt->size); |
| if (avctx->codec_id == AV_CODEC_ID_MVC1) |
| ret = decode_mvc1(avctx, &gb, s->frame->data[0], |
| avctx->width, avctx->height, s->frame->linesize[0]); |
| else |
| ret = decode_mvc2(avctx, &gb, s->frame->data[0], |
| avctx->width, avctx->height, s->frame->linesize[0], |
| s->vflip); |
| if (ret < 0) |
| return ret; |
| |
| *got_frame = 1; |
| if ((ret = av_frame_ref(data, s->frame)) < 0) |
| return ret; |
| |
| return avpkt->size; |
| } |
| |
| static av_cold int mvc_decode_end(AVCodecContext *avctx) |
| { |
| MvcContext *s = avctx->priv_data; |
| |
| av_frame_free(&s->frame); |
| |
| return 0; |
| } |
| |
| #if CONFIG_MVC1_DECODER |
| AVCodec ff_mvc1_decoder = { |
| .name = "mvc1", |
| .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_MVC1, |
| .priv_data_size = sizeof(MvcContext), |
| .init = mvc_decode_init, |
| .close = mvc_decode_end, |
| .decode = mvc_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
| |
| #if CONFIG_MVC2_DECODER |
| AVCodec ff_mvc2_decoder = { |
| .name = "mvc2", |
| .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_MVC2, |
| .priv_data_size = sizeof(MvcContext), |
| .init = mvc_decode_init, |
| .close = mvc_decode_end, |
| .decode = mvc_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
