| /* |
| * Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com> |
| * Copyright (C) 2008 Ramiro Polla <ramiro@lisha.ufsc.br> |
| * |
| * 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 |
| */ |
| |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdint.h> |
| |
| #include "avcodec.h" |
| #include "bitstream.h" |
| #include "bytestream.h" |
| #include "dsputil.h" |
| |
| #define MIMIC_HEADER_SIZE 20 |
| |
| typedef struct { |
| AVCodecContext *avctx; |
| |
| int num_vblocks[3]; |
| int num_hblocks[3]; |
| |
| uint8_t *swap_buf; |
| int swap_buf_size; |
| |
| int cur_index; |
| int prev_index; |
| |
| AVFrame buf_ptrs [16]; |
| AVPicture flipped_ptrs[16]; |
| |
| DECLARE_ALIGNED_16(DCTELEM, dct_block[64]); |
| |
| GetBitContext gb; |
| ScanTable scantable; |
| DSPContext dsp; |
| VLC vlc; |
| } MimicContext; |
| |
| static const uint32_t huffcodes[] = { |
| 0x0000000a, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, |
| 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, |
| 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x0000000b, |
| 0x0000001b, 0x00000038, 0x00000078, 0x00000079, 0x0000007a, 0x000000f9, |
| 0x000000fa, 0x000003fb, 0x000007f8, 0x000007f9, 0x000007fa, 0x000007fb, |
| 0x00000ff8, 0x00000ff9, 0x00000001, 0x00000039, 0x0000007b, 0x000000fb, |
| 0x000001f8, 0x000001f9, 0x00000ffa, 0x00000ffb, 0x00001ff8, 0x00001ff9, |
| 0x00001ffa, 0x00001ffb, 0x00003ff8, 0x00003ff9, 0x00003ffa, 0x00000000, |
| 0x00000004, 0x0000003a, 0x000001fa, 0x00003ffb, 0x00007ff8, 0x00007ff9, |
| 0x00007ffa, 0x00007ffb, 0x0000fff8, 0x0000fff9, 0x0000fffa, 0x0000fffb, |
| 0x0001fff8, 0x0001fff9, 0x0001fffa, 0x00000000, 0x0000000c, 0x000000f8, |
| 0x000001fb, 0x0001fffb, 0x0003fff8, 0x0003fff9, 0x0003fffa, 0x0003fffb, |
| 0x0007fff8, 0x0007fff9, 0x0007fffa, 0x0007fffb, 0x000ffff8, 0x000ffff9, |
| 0x000ffffa, 0x00000000, 0x0000001a, 0x000003f8, 0x000ffffb, 0x001ffff8, |
| 0x001ffff9, 0x001ffffa, 0x001ffffb, 0x003ffff8, 0x003ffff9, 0x003ffffa, |
| 0x003ffffb, 0x007ffff8, 0x007ffff9, 0x007ffffa, 0x007ffffb, 0x00000000, |
| 0x0000003b, 0x000003f9, 0x00fffff8, 0x00fffff9, 0x00fffffa, 0x00fffffb, |
| 0x01fffff8, 0x01fffff9, 0x01fffffa, 0x01fffffb, 0x03fffff8, 0x03fffff9, |
| 0x03fffffa, 0x03fffffb, 0x07fffff8, 0x00000000, 0x000003fa, 0x07fffff9, |
| 0x07fffffa, 0x07fffffb, 0x0ffffff8, 0x0ffffff9, 0x0ffffffa, 0x0ffffffb, |
| 0x1ffffff8, 0x1ffffff9, 0x1ffffffa, 0x1ffffffb, 0x3ffffff8, 0x3ffffff9, |
| 0x3ffffffa, |
| }; |
| |
| static const uint8_t huffbits[] = { |
| 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 2, 4, 5, 6, 7, 7, 7, 8, |
| 8, 10, 11, 11, 11, 11, 12, 12, 2, 6, 7, 8, |
| 9, 9, 12, 12, 13, 13, 13, 13, 14, 14, 14, 0, |
| 3, 6, 9, 14, 15, 15, 15, 15, 16, 16, 16, 16, |
| 17, 17, 17, 0, 4, 8, 9, 17, 18, 18, 18, 18, |
| 19, 19, 19, 19, 20, 20, 20, 0, 5, 10, 20, 21, |
| 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 0, |
| 6, 10, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, |
| 26, 26, 27, 0, 10, 27, 27, 27, 28, 28, 28, 28, |
| 29, 29, 29, 29, 30, 30, 30, |
| }; |
| |
| static const uint8_t col_zag[64] = { |
| 0, 8, 1, 2, 9, 16, 24, 17, |
| 10, 3, 4, 11, 18, 25, 32, 40, |
| 33, 26, 19, 12, 5, 6, 13, 20, |
| 27, 34, 41, 48, 56, 49, 42, 35, |
| 28, 21, 14, 7, 15, 22, 29, 36, |
| 43, 50, 57, 58, 51, 44, 37, 30, |
| 23, 31, 38, 45, 52, 59, 39, 46, |
| 53, 60, 61, 54, 47, 55, 62, 63, |
| }; |
| |
| static av_cold int mimic_decode_init(AVCodecContext *avctx) |
| { |
| MimicContext *ctx = avctx->priv_data; |
| |
| ctx->prev_index = 0; |
| ctx->cur_index = 15; |
| |
| if(init_vlc(&ctx->vlc, 11, FF_ARRAY_ELEMS(huffbits), |
| huffbits, 1, 1, huffcodes, 4, 4, 0)) { |
| av_log(avctx, AV_LOG_ERROR, "error initializing vlc table\n"); |
| return -1; |
| } |
| dsputil_init(&ctx->dsp, avctx); |
| ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, col_zag); |
| |
| return 0; |
| } |
| |
| static const int8_t vlcdec_lookup[9][64] = { |
| { 0, }, |
| { -1, 1, }, |
| { -3, 3, -2, 2, }, |
| { -7, 7, -6, 6, -5, 5, -4, 4, }, |
| { -15, 15, -14, 14, -13, 13, -12, 12, |
| -11, 11, -10, 10, -9, 9, -8, 8, }, |
| { -31, 31, -30, 30, -29, 29, -28, 28, |
| -27, 27, -26, 26, -25, 25, -24, 24, |
| -23, 23, -22, 22, -21, 21, -20, 20, |
| -19, 19, -18, 18, -17, 17, -16, 16, }, |
| { -63, 63, -62, 62, -61, 61, -60, 60, |
| -59, 59, -58, 58, -57, 57, -56, 56, |
| -55, 55, -54, 54, -53, 53, -52, 52, |
| -51, 51, -50, 50, -49, 49, -48, 48, |
| -47, 47, -46, 46, -45, 45, -44, 44, |
| -43, 43, -42, 42, -41, 41, -40, 40, |
| -39, 39, -38, 38, -37, 37, -36, 36, |
| -35, 35, -34, 34, -33, 33, -32, 32, }, |
| { -127, 127, -126, 126, -125, 125, -124, 124, |
| -123, 123, -122, 122, -121, 121, -120, 120, |
| -119, 119, -118, 118, -117, 117, -116, 116, |
| -115, 115, -114, 114, -113, 113, -112, 112, |
| -111, 111, -110, 110, -109, 109, -108, 108, |
| -107, 107, -106, 106, -105, 105, -104, 104, |
| -103, 103, -102, 102, -101, 101, -100, 100, |
| -99, 99, -98, 98, -97, 97, -96, 96, }, |
| { -95, 95, -94, 94, -93, 93, -92, 92, |
| -91, 91, -90, 90, -89, 89, -88, 88, |
| -87, 87, -86, 86, -85, 85, -84, 84, |
| -83, 83, -82, 82, -81, 81, -80, 80, |
| -79, 79, -78, 78, -77, 77, -76, 76, |
| -75, 75, -74, 74, -73, 73, -72, 72, |
| -71, 71, -70, 70, -69, 69, -68, 68, |
| -67, 67, -66, 66, -65, 65, -64, 64, }, |
| }; |
| |
| static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale) |
| { |
| DCTELEM *block = ctx->dct_block; |
| unsigned int pos; |
| |
| ctx->dsp.clear_block(block); |
| |
| block[0] = get_bits(&ctx->gb, 8) << 3; |
| |
| for(pos = 1; pos < num_coeffs; pos++) { |
| uint32_t vlc, num_bits; |
| int value; |
| int coeff; |
| |
| vlc = get_vlc2(&ctx->gb, ctx->vlc.table, ctx->vlc.bits, 3); |
| if(!vlc) /* end-of-block code */ |
| return 1; |
| if(vlc == -1) |
| return 0; |
| |
| /* pos_add and num_bits are coded in the vlc code */ |
| pos += vlc&15; // pos_add |
| num_bits = vlc>>4; // num_bits |
| |
| if(pos >= 64) |
| return 0; |
| |
| value = get_bits(&ctx->gb, num_bits); |
| |
| /* FFmpeg's IDCT behaves somewhat different from the original code, so |
| * a factor of 4 was added to the input */ |
| |
| coeff = vlcdec_lookup[num_bits][value]; |
| if(pos<3) |
| coeff <<= 4; |
| else /* TODO Use >> 10 instead of / 1001 */ |
| coeff = (coeff * qscale) / 1001; |
| |
| block[ctx->scantable.permutated[pos]] = coeff; |
| } |
| |
| return 1; |
| } |
| |
| static int decode(MimicContext *ctx, int quality, int num_coeffs, |
| int is_iframe) |
| { |
| int y, x, plane; |
| |
| for(plane = 0; plane < 3; plane++) { |
| const int is_chroma = !!plane; |
| const int qscale = av_clip(10000-quality,is_chroma?1000:2000,10000)<<2; |
| const int stride = ctx->flipped_ptrs[ctx->cur_index].linesize[plane]; |
| const uint8_t *src = ctx->flipped_ptrs[ctx->prev_index].data[plane]; |
| uint8_t *dst = ctx->flipped_ptrs[ctx->cur_index ].data[plane]; |
| |
| for(y = 0; y < ctx->num_vblocks[plane]; y++) { |
| for(x = 0; x < ctx->num_hblocks[plane]; x++) { |
| |
| /* Check for a change condition in the current block. |
| * - iframes always change. |
| * - Luma plane changes on get_bits1 == 0 |
| * - Chroma planes change on get_bits1 == 1 */ |
| if(is_iframe || get_bits1(&ctx->gb) == is_chroma) { |
| |
| /* Luma planes may use a backreference from the 15 last |
| * frames preceding the previous. (get_bits1 == 1) |
| * Chroma planes don't use backreferences. */ |
| if(is_chroma || is_iframe || !get_bits1(&ctx->gb)) { |
| |
| if(!vlc_decode_block(ctx, num_coeffs, qscale)) |
| return 0; |
| ctx->dsp.idct_put(dst, stride, ctx->dct_block); |
| } else { |
| unsigned int backref = get_bits(&ctx->gb, 4); |
| int index = (ctx->cur_index+backref)&15; |
| uint8_t *p = ctx->flipped_ptrs[index].data[0]; |
| |
| if(p) { |
| p += src - |
| ctx->flipped_ptrs[ctx->prev_index].data[plane]; |
| ctx->dsp.put_pixels_tab[1][0](dst, p, stride, 8); |
| } else { |
| av_log(ctx->avctx, AV_LOG_ERROR, |
| "No such backreference! Buggy sample.\n"); |
| } |
| } |
| } else { |
| ctx->dsp.put_pixels_tab[1][0](dst, src, stride, 8); |
| } |
| src += 8; |
| dst += 8; |
| } |
| src += (stride - ctx->num_hblocks[plane])<<3; |
| dst += (stride - ctx->num_hblocks[plane])<<3; |
| } |
| } |
| |
| return 1; |
| } |
| |
| /** |
| * Flip the buffer upside-down and put it in the YVU order to match the |
| * way Mimic encodes frames. |
| */ |
| static void prepare_avpic(MimicContext *ctx, AVPicture *dst, AVPicture *src) |
| { |
| int i; |
| dst->data[0] = src->data[0]+( ctx->avctx->height -1)*src->linesize[0]; |
| dst->data[1] = src->data[2]+((ctx->avctx->height>>1)-1)*src->linesize[2]; |
| dst->data[2] = src->data[1]+((ctx->avctx->height>>1)-1)*src->linesize[1]; |
| for(i = 0; i < 3; i++) |
| dst->linesize[i] = -src->linesize[i]; |
| } |
| |
| static int mimic_decode_frame(AVCodecContext *avctx, void *data, |
| int *data_size, const uint8_t *buf, int buf_size) |
| { |
| MimicContext *ctx = avctx->priv_data; |
| int is_pframe; |
| int width, height; |
| int quality, num_coeffs; |
| int swap_buf_size = buf_size - MIMIC_HEADER_SIZE; |
| |
| if(buf_size < MIMIC_HEADER_SIZE) { |
| av_log(avctx, AV_LOG_ERROR, "insufficient data\n"); |
| return -1; |
| } |
| |
| buf += 2; /* some constant (always 256) */ |
| quality = bytestream_get_le16(&buf); |
| width = bytestream_get_le16(&buf); |
| height = bytestream_get_le16(&buf); |
| buf += 4; /* some constant */ |
| is_pframe = bytestream_get_le32(&buf); |
| num_coeffs = bytestream_get_byte(&buf); |
| buf += 3; /* some constant */ |
| |
| if(!ctx->avctx) { |
| int i; |
| |
| if(!(width == 160 && height == 120) && |
| !(width == 320 && height == 240)) { |
| av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n"); |
| return -1; |
| } |
| |
| ctx->avctx = avctx; |
| avctx->width = width; |
| avctx->height = height; |
| avctx->pix_fmt = PIX_FMT_YUV420P; |
| for(i = 0; i < 3; i++) { |
| ctx->num_vblocks[i] = -((-height) >> (3 + !!i)); |
| ctx->num_hblocks[i] = width >> (3 + !!i) ; |
| } |
| } else if(width != ctx->avctx->width || height != ctx->avctx->height) { |
| av_log(avctx, AV_LOG_ERROR, "resolution changing is not supported\n"); |
| return -1; |
| } |
| |
| if(is_pframe && !ctx->buf_ptrs[ctx->prev_index].data[0]) { |
| av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n"); |
| return -1; |
| } |
| |
| ctx->buf_ptrs[ctx->cur_index].reference = 1; |
| if(avctx->get_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index])) { |
| av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
| return -1; |
| } |
| |
| prepare_avpic(ctx, &ctx->flipped_ptrs[ctx->cur_index], |
| (AVPicture*) &ctx->buf_ptrs[ctx->cur_index]); |
| |
| ctx->swap_buf = av_fast_realloc(ctx->swap_buf, &ctx->swap_buf_size, |
| swap_buf_size + FF_INPUT_BUFFER_PADDING_SIZE); |
| if(!ctx->swap_buf) |
| return AVERROR_NOMEM; |
| |
| ctx->dsp.bswap_buf((uint32_t*)ctx->swap_buf, |
| (const uint32_t*) buf, |
| swap_buf_size>>2); |
| init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3); |
| |
| if(!decode(ctx, quality, num_coeffs, !is_pframe)) { |
| avctx->release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]); |
| return -1; |
| } |
| |
| ctx->buf_ptrs[ctx->cur_index].pict_type = is_pframe ? FF_P_TYPE:FF_I_TYPE; |
| *(AVFrame*)data = ctx->buf_ptrs[ctx->cur_index]; |
| *data_size = sizeof(AVFrame); |
| |
| ctx->prev_index = ctx->cur_index; |
| ctx->cur_index--; |
| ctx->cur_index &= 15; |
| |
| /* Only release frames that aren't used for backreferences anymore */ |
| if(ctx->buf_ptrs[ctx->cur_index].data[0]) |
| avctx->release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]); |
| |
| return buf_size; |
| } |
| |
| static av_cold int mimic_decode_end(AVCodecContext *avctx) |
| { |
| MimicContext *ctx = avctx->priv_data; |
| int i; |
| |
| av_free(ctx->swap_buf); |
| for(i = 0; i < 16; i++) |
| if(ctx->buf_ptrs[i].data[0]) |
| avctx->release_buffer(avctx, &ctx->buf_ptrs[i]); |
| free_vlc(&ctx->vlc); |
| |
| return 0; |
| } |
| |
| AVCodec mimic_decoder = { |
| "mimic", |
| CODEC_TYPE_VIDEO, |
| CODEC_ID_MIMIC, |
| sizeof(MimicContext), |
| mimic_decode_init, |
| NULL, |
| mimic_decode_end, |
| mimic_decode_frame, |
| CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("Mimic"), |
| }; |
