| /* |
| * SVQ1 decoder |
| * ported to MPlayer by Arpi <arpi@thot.banki.hu> |
| * ported to libavcodec by Nick Kurshev <nickols_k@mail.ru> |
| * |
| * Copyright (c) 2002 The Xine project |
| * Copyright (c) 2002 The FFmpeg project |
| * |
| * SVQ1 Encoder (c) 2004 Mike Melanson <melanson@pcisys.net> |
| * |
| * 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 |
| * Sorenson Vector Quantizer #1 (SVQ1) video codec. |
| * For more information of the SVQ1 algorithm, visit: |
| * http://www.pcisys.net/~melanson/codecs/ |
| */ |
| |
| #include "libavutil/crc.h" |
| #include "libavutil/thread.h" |
| |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "h263.h" |
| #include "hpeldsp.h" |
| #include "internal.h" |
| #include "mathops.h" |
| #include "svq1.h" |
| |
| static VLC svq1_block_type; |
| static VLC svq1_motion_component; |
| static VLC svq1_intra_multistage[6]; |
| static VLC svq1_inter_multistage[6]; |
| static VLC svq1_intra_mean; |
| static VLC svq1_inter_mean; |
| |
| /* motion vector (prediction) */ |
| typedef struct svq1_pmv_s { |
| int x; |
| int y; |
| } svq1_pmv; |
| |
| typedef struct SVQ1Context { |
| HpelDSPContext hdsp; |
| GetBitContext gb; |
| AVFrame *prev; |
| |
| uint8_t *pkt_swapped; |
| int pkt_swapped_allocated; |
| |
| int width; |
| int height; |
| int frame_code; |
| int nonref; // 1 if the current frame won't be referenced |
| } SVQ1Context; |
| |
| static const uint8_t string_table[256] = { |
| 0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54, |
| 0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D, |
| 0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06, |
| 0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F, |
| 0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0, |
| 0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9, |
| 0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2, |
| 0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B, |
| 0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9, |
| 0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0, |
| 0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B, |
| 0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2, |
| 0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D, |
| 0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44, |
| 0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F, |
| 0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16, |
| 0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB, |
| 0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92, |
| 0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9, |
| 0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0, |
| 0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F, |
| 0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36, |
| 0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D, |
| 0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64, |
| 0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26, |
| 0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F, |
| 0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74, |
| 0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D, |
| 0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82, |
| 0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB, |
| 0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0, |
| 0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9 |
| }; |
| |
| #define SVQ1_PROCESS_VECTOR() \ |
| for (; level > 0; i++) { \ |
| /* process next depth */ \ |
| if (i == m) { \ |
| m = n; \ |
| if (--level == 0) \ |
| break; \ |
| } \ |
| /* divide block if next bit set */ \ |
| if (!get_bits1(bitbuf)) \ |
| break; \ |
| /* add child nodes */ \ |
| list[n++] = list[i]; \ |
| list[n++] = list[i] + (((level & 1) ? pitch : 1) << ((level >> 1) + 1));\ |
| } |
| |
| #define SVQ1_ADD_CODEBOOK() \ |
| /* add codebook entries to vector */ \ |
| for (j = 0; j < stages; j++) { \ |
| n3 = codebook[entries[j]] ^ 0x80808080; \ |
| n1 += (n3 & 0xFF00FF00) >> 8; \ |
| n2 += n3 & 0x00FF00FF; \ |
| } \ |
| \ |
| /* clip to [0..255] */ \ |
| if (n1 & 0xFF00FF00) { \ |
| n3 = (n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \ |
| n1 += 0x7F007F00; \ |
| n1 |= (~n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \ |
| n1 &= n3 & 0x00FF00FF; \ |
| } \ |
| \ |
| if (n2 & 0xFF00FF00) { \ |
| n3 = (n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \ |
| n2 += 0x7F007F00; \ |
| n2 |= (~n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \ |
| n2 &= n3 & 0x00FF00FF; \ |
| } |
| |
| #define SVQ1_CALC_CODEBOOK_ENTRIES(cbook) \ |
| codebook = (const uint32_t *)cbook[level]; \ |
| if (stages > 0) \ |
| bit_cache = get_bits(bitbuf, 4 * stages); \ |
| /* calculate codebook entries for this vector */ \ |
| for (j = 0; j < stages; j++) { \ |
| entries[j] = (((bit_cache >> (4 * (stages - j - 1))) & 0xF) + \ |
| 16 * j) << (level + 1); \ |
| } \ |
| mean -= stages * 128; \ |
| n4 = (mean << 16) + mean; |
| |
| static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels, |
| ptrdiff_t pitch) |
| { |
| uint32_t bit_cache; |
| uint8_t *list[63]; |
| uint32_t *dst; |
| const uint32_t *codebook; |
| int entries[6]; |
| int i, j, m, n; |
| int stages; |
| unsigned mean; |
| unsigned x, y, width, height, level; |
| uint32_t n1, n2, n3, n4; |
| |
| /* initialize list for breadth first processing of vectors */ |
| list[0] = pixels; |
| |
| /* recursively process vector */ |
| for (i = 0, m = 1, n = 1, level = 5; i < n; i++) { |
| SVQ1_PROCESS_VECTOR(); |
| |
| /* destination address and vector size */ |
| dst = (uint32_t *)list[i]; |
| width = 1 << ((4 + level) / 2); |
| height = 1 << ((3 + level) / 2); |
| |
| /* get number of stages (-1 skips vector, 0 for mean only) */ |
| stages = get_vlc2(bitbuf, svq1_intra_multistage[level].table, 3, 3) - 1; |
| |
| if (stages == -1) { |
| for (y = 0; y < height; y++) |
| memset(&dst[y * (pitch / 4)], 0, width); |
| continue; /* skip vector */ |
| } |
| |
| if ((stages > 0 && level >= 4)) { |
| ff_dlog(NULL, |
| "Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n", |
| stages, level); |
| return AVERROR_INVALIDDATA; /* invalid vector */ |
| } |
| av_assert0(stages >= 0); |
| |
| mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3); |
| |
| if (stages == 0) { |
| for (y = 0; y < height; y++) |
| memset(&dst[y * (pitch / 4)], mean, width); |
| } else { |
| SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_intra_codebooks); |
| |
| for (y = 0; y < height; y++) { |
| for (x = 0; x < width / 4; x++, codebook++) { |
| n1 = n4; |
| n2 = n4; |
| SVQ1_ADD_CODEBOOK() |
| /* store result */ |
| dst[x] = n1 << 8 | n2; |
| } |
| dst += pitch / 4; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels, |
| ptrdiff_t pitch) |
| { |
| uint32_t bit_cache; |
| uint8_t *list[63]; |
| uint32_t *dst; |
| const uint32_t *codebook; |
| int entries[6]; |
| int i, j, m, n; |
| int stages; |
| unsigned mean; |
| int x, y, width, height, level; |
| uint32_t n1, n2, n3, n4; |
| |
| /* initialize list for breadth first processing of vectors */ |
| list[0] = pixels; |
| |
| /* recursively process vector */ |
| for (i = 0, m = 1, n = 1, level = 5; i < n; i++) { |
| SVQ1_PROCESS_VECTOR(); |
| |
| /* destination address and vector size */ |
| dst = (uint32_t *)list[i]; |
| width = 1 << ((4 + level) / 2); |
| height = 1 << ((3 + level) / 2); |
| |
| /* get number of stages (-1 skips vector, 0 for mean only) */ |
| stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1; |
| |
| if (stages == -1) |
| continue; /* skip vector */ |
| |
| if ((stages > 0 && level >= 4)) { |
| ff_dlog(NULL, |
| "Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n", |
| stages, level); |
| return AVERROR_INVALIDDATA; /* invalid vector */ |
| } |
| av_assert0(stages >= 0); |
| |
| mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256; |
| |
| SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_inter_codebooks); |
| |
| for (y = 0; y < height; y++) { |
| for (x = 0; x < width / 4; x++, codebook++) { |
| n3 = dst[x]; |
| /* add mean value to vector */ |
| n1 = n4 + ((n3 & 0xFF00FF00) >> 8); |
| n2 = n4 + (n3 & 0x00FF00FF); |
| SVQ1_ADD_CODEBOOK() |
| /* store result */ |
| dst[x] = n1 << 8 | n2; |
| } |
| dst += pitch / 4; |
| } |
| } |
| return 0; |
| } |
| |
| static int svq1_decode_motion_vector(GetBitContext *bitbuf, svq1_pmv *mv, |
| svq1_pmv **pmv) |
| { |
| int diff; |
| int i; |
| |
| for (i = 0; i < 2; i++) { |
| /* get motion code */ |
| diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2); |
| if (diff < 0) |
| return AVERROR_INVALIDDATA; |
| else if (diff) { |
| if (get_bits1(bitbuf)) |
| diff = -diff; |
| } |
| |
| /* add median of motion vector predictors and clip result */ |
| if (i == 1) |
| mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6); |
| else |
| mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6); |
| } |
| |
| return 0; |
| } |
| |
| static void svq1_skip_block(uint8_t *current, uint8_t *previous, |
| ptrdiff_t pitch, int x, int y) |
| { |
| uint8_t *src; |
| uint8_t *dst; |
| int i; |
| |
| src = &previous[x + y * pitch]; |
| dst = current; |
| |
| for (i = 0; i < 16; i++) { |
| memcpy(dst, src, 16); |
| src += pitch; |
| dst += pitch; |
| } |
| } |
| |
| static int svq1_motion_inter_block(HpelDSPContext *hdsp, GetBitContext *bitbuf, |
| uint8_t *current, uint8_t *previous, |
| ptrdiff_t pitch, svq1_pmv *motion, int x, int y, |
| int width, int height) |
| { |
| uint8_t *src; |
| uint8_t *dst; |
| svq1_pmv mv; |
| svq1_pmv *pmv[3]; |
| int result; |
| |
| /* predict and decode motion vector */ |
| pmv[0] = &motion[0]; |
| if (y == 0) { |
| pmv[1] = |
| pmv[2] = pmv[0]; |
| } else { |
| pmv[1] = &motion[x / 8 + 2]; |
| pmv[2] = &motion[x / 8 + 4]; |
| } |
| |
| result = svq1_decode_motion_vector(bitbuf, &mv, pmv); |
| if (result) |
| return result; |
| |
| motion[0].x = |
| motion[x / 8 + 2].x = |
| motion[x / 8 + 3].x = mv.x; |
| motion[0].y = |
| motion[x / 8 + 2].y = |
| motion[x / 8 + 3].y = mv.y; |
| |
| mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16)); |
| mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16)); |
| |
| src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch]; |
| dst = current; |
| |
| hdsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16); |
| |
| return 0; |
| } |
| |
| static int svq1_motion_inter_4v_block(HpelDSPContext *hdsp, GetBitContext *bitbuf, |
| uint8_t *current, uint8_t *previous, |
| ptrdiff_t pitch, svq1_pmv *motion, int x, int y, |
| int width, int height) |
| { |
| uint8_t *src; |
| uint8_t *dst; |
| svq1_pmv mv; |
| svq1_pmv *pmv[4]; |
| int i, result; |
| |
| /* predict and decode motion vector (0) */ |
| pmv[0] = &motion[0]; |
| if (y == 0) { |
| pmv[1] = |
| pmv[2] = pmv[0]; |
| } else { |
| pmv[1] = &motion[(x / 8) + 2]; |
| pmv[2] = &motion[(x / 8) + 4]; |
| } |
| |
| result = svq1_decode_motion_vector(bitbuf, &mv, pmv); |
| if (result) |
| return result; |
| |
| /* predict and decode motion vector (1) */ |
| pmv[0] = &mv; |
| if (y == 0) { |
| pmv[1] = |
| pmv[2] = pmv[0]; |
| } else { |
| pmv[1] = &motion[(x / 8) + 3]; |
| } |
| result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv); |
| if (result) |
| return result; |
| |
| /* predict and decode motion vector (2) */ |
| pmv[1] = &motion[0]; |
| pmv[2] = &motion[(x / 8) + 1]; |
| |
| result = svq1_decode_motion_vector(bitbuf, &motion[(x / 8) + 2], pmv); |
| if (result) |
| return result; |
| |
| /* predict and decode motion vector (3) */ |
| pmv[2] = &motion[(x / 8) + 2]; |
| pmv[3] = &motion[(x / 8) + 3]; |
| |
| result = svq1_decode_motion_vector(bitbuf, pmv[3], pmv); |
| if (result) |
| return result; |
| |
| /* form predictions */ |
| for (i = 0; i < 4; i++) { |
| int mvx = pmv[i]->x + (i & 1) * 16; |
| int mvy = pmv[i]->y + (i >> 1) * 16; |
| |
| // FIXME: clipping or padding? |
| mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8)); |
| mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8)); |
| |
| src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch]; |
| dst = current; |
| |
| hdsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8); |
| |
| /* select next block */ |
| if (i & 1) |
| current += 8 * (pitch - 1); |
| else |
| current += 8; |
| } |
| |
| return 0; |
| } |
| |
| static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp, |
| GetBitContext *bitbuf, |
| uint8_t *current, uint8_t *previous, |
| ptrdiff_t pitch, svq1_pmv *motion, int x, int y, |
| int width, int height) |
| { |
| uint32_t block_type; |
| int result = 0; |
| |
| /* get block type */ |
| block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2); |
| |
| /* reset motion vectors */ |
| if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) { |
| motion[0].x = |
| motion[0].y = |
| motion[x / 8 + 2].x = |
| motion[x / 8 + 2].y = |
| motion[x / 8 + 3].x = |
| motion[x / 8 + 3].y = 0; |
| } |
| |
| switch (block_type) { |
| case SVQ1_BLOCK_SKIP: |
| svq1_skip_block(current, previous, pitch, x, y); |
| break; |
| |
| case SVQ1_BLOCK_INTER: |
| result = svq1_motion_inter_block(hdsp, bitbuf, current, previous, |
| pitch, motion, x, y, width, height); |
| |
| if (result != 0) { |
| ff_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result); |
| break; |
| } |
| result = svq1_decode_block_non_intra(bitbuf, current, pitch); |
| break; |
| |
| case SVQ1_BLOCK_INTER_4V: |
| result = svq1_motion_inter_4v_block(hdsp, bitbuf, current, previous, |
| pitch, motion, x, y, width, height); |
| |
| if (result != 0) { |
| ff_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result); |
| break; |
| } |
| result = svq1_decode_block_non_intra(bitbuf, current, pitch); |
| break; |
| |
| case SVQ1_BLOCK_INTRA: |
| result = svq1_decode_block_intra(bitbuf, current, pitch); |
| break; |
| } |
| |
| return result; |
| } |
| |
| static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257]) |
| { |
| uint8_t seed; |
| int i; |
| |
| out[0] = get_bits(bitbuf, 8); |
| seed = string_table[out[0]]; |
| |
| for (i = 1; i <= out[0]; i++) { |
| out[i] = get_bits(bitbuf, 8) ^ seed; |
| seed = string_table[out[i] ^ seed]; |
| } |
| out[i] = 0; |
| } |
| |
| static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame) |
| { |
| SVQ1Context *s = avctx->priv_data; |
| GetBitContext *bitbuf = &s->gb; |
| int frame_size_code; |
| int width = s->width; |
| int height = s->height; |
| |
| skip_bits(bitbuf, 8); /* temporal_reference */ |
| |
| /* frame type */ |
| s->nonref = 0; |
| switch (get_bits(bitbuf, 2)) { |
| case 0: |
| frame->pict_type = AV_PICTURE_TYPE_I; |
| break; |
| case 2: |
| s->nonref = 1; |
| case 1: |
| frame->pict_type = AV_PICTURE_TYPE_P; |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (frame->pict_type == AV_PICTURE_TYPE_I) { |
| /* unknown fields */ |
| if (s->frame_code == 0x50 || s->frame_code == 0x60) { |
| int csum = get_bits(bitbuf, 16); |
| |
| csum = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_CCITT), av_bswap16(csum), bitbuf->buffer, bitbuf->size_in_bits >> 3)); |
| |
| ff_dlog(avctx, "%s checksum (%02x) for packet data\n", |
| (csum == 0) ? "correct" : "incorrect", csum); |
| } |
| |
| if ((s->frame_code ^ 0x10) >= 0x50) { |
| uint8_t msg[257]; |
| |
| svq1_parse_string(bitbuf, msg); |
| |
| av_log(avctx, AV_LOG_INFO, |
| "embedded message:\n%s\n", ((char *)msg) + 1); |
| } |
| |
| skip_bits(bitbuf, 2); |
| skip_bits(bitbuf, 2); |
| skip_bits1(bitbuf); |
| |
| /* load frame size */ |
| frame_size_code = get_bits(bitbuf, 3); |
| |
| if (frame_size_code == 7) { |
| /* load width, height (12 bits each) */ |
| width = get_bits(bitbuf, 12); |
| height = get_bits(bitbuf, 12); |
| |
| if (!width || !height) |
| return AVERROR_INVALIDDATA; |
| } else { |
| /* get width, height from table */ |
| width = ff_svq1_frame_size_table[frame_size_code][0]; |
| height = ff_svq1_frame_size_table[frame_size_code][1]; |
| } |
| } |
| |
| /* unknown fields */ |
| if (get_bits1(bitbuf)) { |
| skip_bits1(bitbuf); /* use packet checksum if (1) */ |
| skip_bits1(bitbuf); /* component checksums after image data if (1) */ |
| |
| if (get_bits(bitbuf, 2) != 0) |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (get_bits1(bitbuf)) { |
| skip_bits1(bitbuf); |
| skip_bits(bitbuf, 4); |
| skip_bits1(bitbuf); |
| skip_bits(bitbuf, 2); |
| |
| if (skip_1stop_8data_bits(bitbuf) < 0) |
| return AVERROR_INVALIDDATA; |
| } |
| if (get_bits_left(bitbuf) <= 0) |
| return AVERROR_INVALIDDATA; |
| |
| s->width = width; |
| s->height = height; |
| return 0; |
| } |
| |
| static int svq1_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_frame, AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| SVQ1Context *s = avctx->priv_data; |
| AVFrame *cur = data; |
| uint8_t *current; |
| int result, i, x, y, width, height; |
| svq1_pmv *pmv; |
| int ret; |
| |
| /* initialize bit buffer */ |
| ret = init_get_bits8(&s->gb, buf, buf_size); |
| if (ret < 0) |
| return ret; |
| |
| /* decode frame header */ |
| s->frame_code = get_bits(&s->gb, 22); |
| |
| if ((s->frame_code & ~0x70) || !(s->frame_code & 0x60)) |
| return AVERROR_INVALIDDATA; |
| |
| /* swap some header bytes (why?) */ |
| if (s->frame_code != 0x20) { |
| uint32_t *src; |
| |
| if (buf_size < 9 * 4) { |
| av_log(avctx, AV_LOG_ERROR, "Input packet too small\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| av_fast_padded_malloc(&s->pkt_swapped, |
| &s->pkt_swapped_allocated, |
| buf_size); |
| if (!s->pkt_swapped) |
| return AVERROR(ENOMEM); |
| |
| memcpy(s->pkt_swapped, buf, buf_size); |
| buf = s->pkt_swapped; |
| init_get_bits(&s->gb, buf, buf_size * 8); |
| skip_bits(&s->gb, 22); |
| |
| src = (uint32_t *)(s->pkt_swapped + 4); |
| |
| for (i = 0; i < 4; i++) |
| src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i]; |
| } |
| |
| result = svq1_decode_frame_header(avctx, cur); |
| if (result != 0) { |
| ff_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result); |
| return result; |
| } |
| |
| result = ff_set_dimensions(avctx, s->width, s->height); |
| if (result < 0) |
| return result; |
| |
| if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) || |
| (avctx->skip_frame >= AVDISCARD_NONKEY && |
| cur->pict_type != AV_PICTURE_TYPE_I) || |
| avctx->skip_frame >= AVDISCARD_ALL) |
| return buf_size; |
| |
| result = ff_get_buffer(avctx, cur, s->nonref ? 0 : AV_GET_BUFFER_FLAG_REF); |
| if (result < 0) |
| return result; |
| |
| pmv = av_malloc_array(FFALIGN(s->width, 16) / 8 + 3, sizeof(*pmv)); |
| if (!pmv) |
| return AVERROR(ENOMEM); |
| |
| /* decode y, u and v components */ |
| for (i = 0; i < 3; i++) { |
| int linesize = cur->linesize[i]; |
| if (i == 0) { |
| width = FFALIGN(s->width, 16); |
| height = FFALIGN(s->height, 16); |
| } else { |
| if (avctx->flags & AV_CODEC_FLAG_GRAY) |
| break; |
| width = FFALIGN(s->width / 4, 16); |
| height = FFALIGN(s->height / 4, 16); |
| } |
| |
| current = cur->data[i]; |
| |
| if (cur->pict_type == AV_PICTURE_TYPE_I) { |
| /* keyframe */ |
| for (y = 0; y < height; y += 16) { |
| for (x = 0; x < width; x += 16) { |
| result = svq1_decode_block_intra(&s->gb, ¤t[x], |
| linesize); |
| if (result) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Error in svq1_decode_block %i (keyframe)\n", |
| result); |
| goto err; |
| } |
| } |
| current += 16 * linesize; |
| } |
| } else { |
| /* delta frame */ |
| uint8_t *previous = s->prev->data[i]; |
| if (!previous || |
| s->prev->width != s->width || s->prev->height != s->height) { |
| av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n"); |
| result = AVERROR_INVALIDDATA; |
| goto err; |
| } |
| |
| memset(pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv)); |
| |
| for (y = 0; y < height; y += 16) { |
| for (x = 0; x < width; x += 16) { |
| result = svq1_decode_delta_block(avctx, &s->hdsp, |
| &s->gb, ¤t[x], |
| previous, linesize, |
| pmv, x, y, width, height); |
| if (result != 0) { |
| ff_dlog(avctx, |
| "Error in svq1_decode_delta_block %i\n", |
| result); |
| goto err; |
| } |
| } |
| |
| pmv[0].x = |
| pmv[0].y = 0; |
| |
| current += 16 * linesize; |
| } |
| } |
| } |
| |
| if (!s->nonref) { |
| av_frame_unref(s->prev); |
| result = av_frame_ref(s->prev, cur); |
| if (result < 0) |
| goto err; |
| } |
| |
| *got_frame = 1; |
| result = buf_size; |
| |
| err: |
| av_free(pmv); |
| return result; |
| } |
| |
| static av_cold void svq1_static_init(void) |
| { |
| INIT_VLC_STATIC(&svq1_block_type, 2, 4, |
| &ff_svq1_block_type_vlc[0][1], 2, 1, |
| &ff_svq1_block_type_vlc[0][0], 2, 1, 6); |
| |
| INIT_VLC_STATIC(&svq1_motion_component, 7, 33, |
| &ff_mvtab[0][1], 2, 1, |
| &ff_mvtab[0][0], 2, 1, 176); |
| |
| for (int i = 0, offset = 0; i < 6; i++) { |
| static const uint8_t sizes[2][6] = { { 14, 10, 14, 18, 16, 18 }, |
| { 10, 10, 14, 14, 14, 16 } }; |
| static VLC_TYPE table[168][2]; |
| svq1_intra_multistage[i].table = &table[offset]; |
| svq1_intra_multistage[i].table_allocated = sizes[0][i]; |
| offset += sizes[0][i]; |
| init_vlc(&svq1_intra_multistage[i], 3, 8, |
| &ff_svq1_intra_multistage_vlc[i][0][1], 2, 1, |
| &ff_svq1_intra_multistage_vlc[i][0][0], 2, 1, |
| INIT_VLC_USE_NEW_STATIC); |
| svq1_inter_multistage[i].table = &table[offset]; |
| svq1_inter_multistage[i].table_allocated = sizes[1][i]; |
| offset += sizes[1][i]; |
| init_vlc(&svq1_inter_multistage[i], 3, 8, |
| &ff_svq1_inter_multistage_vlc[i][0][1], 2, 1, |
| &ff_svq1_inter_multistage_vlc[i][0][0], 2, 1, |
| INIT_VLC_USE_NEW_STATIC); |
| } |
| |
| INIT_VLC_STATIC(&svq1_intra_mean, 8, 256, |
| &ff_svq1_intra_mean_vlc[0][1], 4, 2, |
| &ff_svq1_intra_mean_vlc[0][0], 4, 2, 632); |
| |
| INIT_VLC_STATIC(&svq1_inter_mean, 9, 512, |
| &ff_svq1_inter_mean_vlc[0][1], 4, 2, |
| &ff_svq1_inter_mean_vlc[0][0], 4, 2, 1434); |
| } |
| |
| static av_cold int svq1_decode_init(AVCodecContext *avctx) |
| { |
| static AVOnce init_static_once = AV_ONCE_INIT; |
| SVQ1Context *s = avctx->priv_data; |
| |
| s->prev = av_frame_alloc(); |
| if (!s->prev) |
| return AVERROR(ENOMEM); |
| |
| s->width = avctx->width + 3 & ~3; |
| s->height = avctx->height + 3 & ~3; |
| avctx->pix_fmt = AV_PIX_FMT_YUV410P; |
| |
| ff_hpeldsp_init(&s->hdsp, avctx->flags); |
| |
| ff_thread_once(&init_static_once, svq1_static_init); |
| |
| return 0; |
| } |
| |
| static av_cold int svq1_decode_end(AVCodecContext *avctx) |
| { |
| SVQ1Context *s = avctx->priv_data; |
| |
| av_frame_free(&s->prev); |
| av_freep(&s->pkt_swapped); |
| s->pkt_swapped_allocated = 0; |
| |
| return 0; |
| } |
| |
| static void svq1_flush(AVCodecContext *avctx) |
| { |
| SVQ1Context *s = avctx->priv_data; |
| |
| av_frame_unref(s->prev); |
| } |
| |
| AVCodec ff_svq1_decoder = { |
| .name = "svq1", |
| .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_SVQ1, |
| .priv_data_size = sizeof(SVQ1Context), |
| .init = svq1_decode_init, |
| .close = svq1_decode_end, |
| .decode = svq1_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .flush = svq1_flush, |
| .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV410P, |
| AV_PIX_FMT_NONE }, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
| }; |