LCOV - code coverage report
Current view: top level - libavcodec - mimic.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 130 175 74.3 %
Date: 2017-12-15 11:05:35 Functions: 6 8 75.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (C) 2005  Ole André Vadla Ravnås <oleavr@gmail.com>
       3             :  * Copyright (C) 2008  Ramiro Polla
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include <stdlib.h>
      23             : #include <string.h>
      24             : #include <stdint.h>
      25             : 
      26             : #include "avcodec.h"
      27             : #include "blockdsp.h"
      28             : #include "internal.h"
      29             : #include "get_bits.h"
      30             : #include "bytestream.h"
      31             : #include "bswapdsp.h"
      32             : #include "hpeldsp.h"
      33             : #include "idctdsp.h"
      34             : #include "thread.h"
      35             : 
      36             : #define MIMIC_HEADER_SIZE   20
      37             : 
      38             : typedef struct MimicContext {
      39             :     AVCodecContext *avctx;
      40             : 
      41             :     int             num_vblocks[3];
      42             :     int             num_hblocks[3];
      43             : 
      44             :     void           *swap_buf;
      45             :     int             swap_buf_size;
      46             : 
      47             :     int             cur_index;
      48             :     int             prev_index;
      49             : 
      50             :     ThreadFrame     frames     [16];
      51             : 
      52             :     DECLARE_ALIGNED(32, int16_t, dct_block)[64];
      53             : 
      54             :     GetBitContext   gb;
      55             :     ScanTable       scantable;
      56             :     BlockDSPContext bdsp;
      57             :     BswapDSPContext bbdsp;
      58             :     HpelDSPContext  hdsp;
      59             :     IDCTDSPContext  idsp;
      60             :     VLC             vlc;
      61             : 
      62             :     /* Kept in the context so multithreading can have a constant to read from */
      63             :     int             next_cur_index;
      64             :     int             next_prev_index;
      65             : } MimicContext;
      66             : 
      67             : static const uint32_t huffcodes[] = {
      68             :     0x0000000a, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
      69             :     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
      70             :     0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x0000000b,
      71             :     0x0000001b, 0x00000038, 0x00000078, 0x00000079, 0x0000007a, 0x000000f9,
      72             :     0x000000fa, 0x000003fb, 0x000007f8, 0x000007f9, 0x000007fa, 0x000007fb,
      73             :     0x00000ff8, 0x00000ff9, 0x00000001, 0x00000039, 0x0000007b, 0x000000fb,
      74             :     0x000001f8, 0x000001f9, 0x00000ffa, 0x00000ffb, 0x00001ff8, 0x00001ff9,
      75             :     0x00001ffa, 0x00001ffb, 0x00003ff8, 0x00003ff9, 0x00003ffa, 0x00000000,
      76             :     0x00000004, 0x0000003a, 0x000001fa, 0x00003ffb, 0x00007ff8, 0x00007ff9,
      77             :     0x00007ffa, 0x00007ffb, 0x0000fff8, 0x0000fff9, 0x0000fffa, 0x0000fffb,
      78             :     0x0001fff8, 0x0001fff9, 0x0001fffa, 0x00000000, 0x0000000c, 0x000000f8,
      79             :     0x000001fb, 0x0001fffb, 0x0003fff8, 0x0003fff9, 0x0003fffa, 0x0003fffb,
      80             :     0x0007fff8, 0x0007fff9, 0x0007fffa, 0x0007fffb, 0x000ffff8, 0x000ffff9,
      81             :     0x000ffffa, 0x00000000, 0x0000001a, 0x000003f8, 0x000ffffb, 0x001ffff8,
      82             :     0x001ffff9, 0x001ffffa, 0x001ffffb, 0x003ffff8, 0x003ffff9, 0x003ffffa,
      83             :     0x003ffffb, 0x007ffff8, 0x007ffff9, 0x007ffffa, 0x007ffffb, 0x00000000,
      84             :     0x0000003b, 0x000003f9, 0x00fffff8, 0x00fffff9, 0x00fffffa, 0x00fffffb,
      85             :     0x01fffff8, 0x01fffff9, 0x01fffffa, 0x01fffffb, 0x03fffff8, 0x03fffff9,
      86             :     0x03fffffa, 0x03fffffb, 0x07fffff8, 0x00000000, 0x000003fa, 0x07fffff9,
      87             :     0x07fffffa, 0x07fffffb, 0x0ffffff8, 0x0ffffff9, 0x0ffffffa, 0x0ffffffb,
      88             :     0x1ffffff8, 0x1ffffff9, 0x1ffffffa, 0x1ffffffb, 0x3ffffff8, 0x3ffffff9,
      89             :     0x3ffffffa,
      90             : };
      91             : 
      92             : static const uint8_t huffbits[] = {
      93             :      4,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
      94             :      0,  0,  0,  0,  2,  4,  5,  6,  7,  7,  7,  8,
      95             :      8, 10, 11, 11, 11, 11, 12, 12,  2,  6,  7,  8,
      96             :      9,  9, 12, 12, 13, 13, 13, 13, 14, 14, 14,  0,
      97             :      3,  6,  9, 14, 15, 15, 15, 15, 16, 16, 16, 16,
      98             :     17, 17, 17,  0,  4,  8,  9, 17, 18, 18, 18, 18,
      99             :     19, 19, 19, 19, 20, 20, 20,  0,  5, 10, 20, 21,
     100             :     21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23,  0,
     101             :      6, 10, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26,
     102             :     26, 26, 27,  0, 10, 27, 27, 27, 28, 28, 28, 28,
     103             :     29, 29, 29, 29, 30, 30, 30,
     104             : };
     105             : 
     106             : static const uint8_t col_zag[64] = {
     107             :      0,  8,  1,  2,  9, 16, 24, 17,
     108             :     10,  3,  4, 11, 18, 25, 32, 40,
     109             :     33, 26, 19, 12,  5,  6, 13, 20,
     110             :     27, 34, 41, 48, 56, 49, 42, 35,
     111             :     28, 21, 14,  7, 15, 22, 29, 36,
     112             :     43, 50, 57, 58, 51, 44, 37, 30,
     113             :     23, 31, 38, 45, 52, 59, 39, 46,
     114             :     53, 60, 61, 54, 47, 55, 62, 63,
     115             : };
     116             : 
     117           2 : static av_cold int mimic_decode_end(AVCodecContext *avctx)
     118             : {
     119           2 :     MimicContext *ctx = avctx->priv_data;
     120             :     int i;
     121             : 
     122           2 :     av_freep(&ctx->swap_buf);
     123           2 :     ctx->swap_buf_size = 0;
     124             : 
     125          34 :     for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
     126          32 :         if (ctx->frames[i].f)
     127          32 :             ff_thread_release_buffer(avctx, &ctx->frames[i]);
     128          32 :         av_frame_free(&ctx->frames[i].f);
     129             :     }
     130             : 
     131           2 :     if (!avctx->internal->is_copy)
     132           2 :         ff_free_vlc(&ctx->vlc);
     133             : 
     134           2 :     return 0;
     135             : }
     136             : 
     137           2 : static av_cold int mimic_decode_init(AVCodecContext *avctx)
     138             : {
     139           2 :     MimicContext *ctx = avctx->priv_data;
     140             :     int ret, i;
     141             : 
     142           2 :     avctx->internal->allocate_progress = 1;
     143             : 
     144           2 :     ctx->prev_index = 0;
     145           2 :     ctx->cur_index  = 15;
     146             : 
     147           2 :     if ((ret = init_vlc(&ctx->vlc, 11, FF_ARRAY_ELEMS(huffbits),
     148             :                         huffbits, 1, 1, huffcodes, 4, 4, 0)) < 0) {
     149           0 :         av_log(avctx, AV_LOG_ERROR, "error initializing vlc table\n");
     150           0 :         return ret;
     151             :     }
     152           2 :     ff_blockdsp_init(&ctx->bdsp, avctx);
     153           2 :     ff_bswapdsp_init(&ctx->bbdsp);
     154           2 :     ff_hpeldsp_init(&ctx->hdsp, avctx->flags);
     155           2 :     ff_idctdsp_init(&ctx->idsp, avctx);
     156           2 :     ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable, col_zag);
     157             : 
     158          34 :     for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
     159          32 :         ctx->frames[i].f = av_frame_alloc();
     160          32 :         if (!ctx->frames[i].f) {
     161           0 :             mimic_decode_end(avctx);
     162           0 :             return AVERROR(ENOMEM);
     163             :         }
     164             :     }
     165             : 
     166           2 :     return 0;
     167             : }
     168             : 
     169             : #if HAVE_THREADS
     170           0 : static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
     171             : {
     172           0 :     MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data;
     173             :     int i, ret;
     174             : 
     175           0 :     if (avctx == avctx_from)
     176           0 :         return 0;
     177             : 
     178           0 :     dst->cur_index  = src->next_cur_index;
     179           0 :     dst->prev_index = src->next_prev_index;
     180             : 
     181           0 :     for (i = 0; i < FF_ARRAY_ELEMS(dst->frames); i++) {
     182           0 :         ff_thread_release_buffer(avctx, &dst->frames[i]);
     183           0 :         if (i != src->next_cur_index && src->frames[i].f->data[0]) {
     184           0 :             ret = ff_thread_ref_frame(&dst->frames[i], &src->frames[i]);
     185           0 :             if (ret < 0)
     186           0 :                 return ret;
     187             :         }
     188             :     }
     189             : 
     190           0 :     return 0;
     191             : }
     192             : #endif
     193             : 
     194             : static const int8_t vlcdec_lookup[9][64] = {
     195             :     {    0, },
     196             :     {   -1,   1, },
     197             :     {   -3,   3,   -2,   2, },
     198             :     {   -7,   7,   -6,   6,   -5,   5,   -4,   4, },
     199             :     {  -15,  15,  -14,  14,  -13,  13,  -12,  12,
     200             :        -11,  11,  -10,  10,   -9,   9,   -8,   8, },
     201             :     {  -31,  31,  -30,  30,  -29,  29,  -28,  28,
     202             :        -27,  27,  -26,  26,  -25,  25,  -24,  24,
     203             :        -23,  23,  -22,  22,  -21,  21,  -20,  20,
     204             :        -19,  19,  -18,  18,  -17,  17,  -16,  16, },
     205             :     {  -63,  63,  -62,  62,  -61,  61,  -60,  60,
     206             :        -59,  59,  -58,  58,  -57,  57,  -56,  56,
     207             :        -55,  55,  -54,  54,  -53,  53,  -52,  52,
     208             :        -51,  51,  -50,  50,  -49,  49,  -48,  48,
     209             :        -47,  47,  -46,  46,  -45,  45,  -44,  44,
     210             :        -43,  43,  -42,  42,  -41,  41,  -40,  40,
     211             :        -39,  39,  -38,  38,  -37,  37,  -36,  36,
     212             :        -35,  35,  -34,  34,  -33,  33,  -32,  32, },
     213             :     { -127, 127, -126, 126, -125, 125, -124, 124,
     214             :       -123, 123, -122, 122, -121, 121, -120, 120,
     215             :       -119, 119, -118, 118, -117, 117, -116, 116,
     216             :       -115, 115, -114, 114, -113, 113, -112, 112,
     217             :       -111, 111, -110, 110, -109, 109, -108, 108,
     218             :       -107, 107, -106, 106, -105, 105, -104, 104,
     219             :       -103, 103, -102, 102, -101, 101, -100, 100,
     220             :        -99,  99,  -98,  98,  -97,  97,  -96,  96, },
     221             :     {  -95,  95,  -94,  94,  -93,  93,  -92,  92,
     222             :        -91,  91,  -90,  90,  -89,  89,  -88,  88,
     223             :        -87,  87,  -86,  86,  -85,  85,  -84,  84,
     224             :        -83,  83,  -82,  82,  -81,  81,  -80,  80,
     225             :        -79,  79,  -78,  78,  -77,  77,  -76,  76,
     226             :        -75,  75,  -74,  74,  -73,  73,  -72,  72,
     227             :        -71,  71,  -70,  70,  -69,  69,  -68,  68,
     228             :        -67,  67,  -66,  66,  -65,  65,  -64,  64, },
     229             : };
     230             : 
     231       44548 : static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
     232             : {
     233       44548 :     int16_t *block = ctx->dct_block;
     234             :     unsigned int pos;
     235             : 
     236       44548 :     ctx->bdsp.clear_block(block);
     237             : 
     238       44548 :     block[0] = get_bits(&ctx->gb, 8) << 3;
     239             : 
     240      304893 :     for (pos = 1; pos < num_coeffs; pos++) {
     241             :         uint32_t vlc, num_bits;
     242             :         int value;
     243             :         int coeff;
     244             : 
     245      302169 :         vlc = get_vlc2(&ctx->gb, ctx->vlc.table, ctx->vlc.bits, 3);
     246      302169 :         if (!vlc) /* end-of-block code */
     247       41824 :             return 0;
     248      260345 :         if (vlc == -1)
     249           0 :             return AVERROR_INVALIDDATA;
     250             : 
     251             :         /* pos_add and num_bits are coded in the vlc code */
     252      260345 :         pos     += vlc & 15; // pos_add
     253      260345 :         num_bits = vlc >> 4; // num_bits
     254             : 
     255      260345 :         if (pos >= 64)
     256           0 :             return AVERROR_INVALIDDATA;
     257             : 
     258      260345 :         value = get_bits(&ctx->gb, num_bits);
     259             : 
     260             :         /* FFmpeg's IDCT behaves somewhat different from the original code, so
     261             :          * a factor of 4 was added to the input */
     262             : 
     263      260345 :         coeff = ((int8_t*)vlcdec_lookup[num_bits])[value];
     264      260345 :         if (pos < 3)
     265       50048 :             coeff *= 16;
     266             :         else /* TODO Use >> 10 instead of / 1001 */
     267      210297 :             coeff = (coeff * qscale) / 1001;
     268             : 
     269      260345 :         block[ctx->scantable.permutated[pos]] = coeff;
     270             :     }
     271             : 
     272        2724 :     return 0;
     273             : }
     274             : 
     275          77 : static int decode(MimicContext *ctx, int quality, int num_coeffs,
     276             :                   int is_iframe)
     277             : {
     278          77 :     int ret, y, x, plane, cur_row = 0;
     279             : 
     280         308 :     for (plane = 0; plane < 3; plane++) {
     281         231 :         const int is_chroma = !!plane;
     282         231 :         const int qscale    = av_clip(10000 - quality, is_chroma ? 1000 : 2000,
     283             :                                       10000) << 2;
     284         231 :         const int stride    = ctx->frames[ctx->cur_index ].f->linesize[plane];
     285         231 :         const uint8_t *src  = ctx->frames[ctx->prev_index].f->data[plane];
     286         231 :         uint8_t       *dst  = ctx->frames[ctx->cur_index ].f->data[plane];
     287             : 
     288        4851 :         for (y = 0; y < ctx->num_vblocks[plane]; y++) {
     289      143220 :             for (x = 0; x < ctx->num_hblocks[plane]; x++) {
     290             :                 /* Check for a change condition in the current block.
     291             :                  * - iframes always change.
     292             :                  * - Luma plane changes on get_bits1 == 0
     293             :                  * - Chroma planes change on get_bits1 == 1 */
     294      138600 :                 if (is_iframe || get_bits1(&ctx->gb) == is_chroma) {
     295             :                     /* Luma planes may use a backreference from the 15 last
     296             :                      * frames preceding the previous. (get_bits1 == 1)
     297             :                      * Chroma planes don't use backreferences. */
     298      100982 :                     if (is_chroma || is_iframe || !get_bits1(&ctx->gb)) {
     299       44548 :                         if ((ret = vlc_decode_block(ctx, num_coeffs,
     300             :                                                     qscale)) < 0) {
     301           0 :                             av_log(ctx->avctx, AV_LOG_ERROR, "Error decoding "
     302             :                                    "block.\n");
     303           0 :                             return ret;
     304             :                         }
     305       44548 :                         ctx->idsp.idct_put(dst, stride, ctx->dct_block);
     306             :                     } else {
     307        5943 :                         unsigned int backref = get_bits(&ctx->gb, 4);
     308        5943 :                         int index            = (ctx->cur_index + backref) & 15;
     309        5943 :                         uint8_t *p           = ctx->frames[index].f->data[0];
     310             : 
     311        5943 :                         if (index != ctx->cur_index && p) {
     312        5943 :                             ff_thread_await_progress(&ctx->frames[index],
     313             :                                                      cur_row, 0);
     314       11886 :                             p += src -
     315        5943 :                                  ctx->frames[ctx->prev_index].f->data[plane];
     316        5943 :                             ctx->hdsp.put_pixels_tab[1][0](dst, p, stride, 8);
     317             :                         } else {
     318           0 :                             av_log(ctx->avctx, AV_LOG_ERROR,
     319             :                                      "No such backreference! Buggy sample.\n");
     320             :                         }
     321             :                     }
     322             :                 } else {
     323       88109 :                     ff_thread_await_progress(&ctx->frames[ctx->prev_index],
     324             :                                              cur_row, 0);
     325       88109 :                     ctx->hdsp.put_pixels_tab[1][0](dst, src, stride, 8);
     326             :                 }
     327      138600 :                 src += 8;
     328      138600 :                 dst += 8;
     329             :             }
     330        4620 :             src += (stride - ctx->num_hblocks[plane]) << 3;
     331        4620 :             dst += (stride - ctx->num_hblocks[plane]) << 3;
     332             : 
     333        4620 :             ff_thread_report_progress(&ctx->frames[ctx->cur_index],
     334             :                                       cur_row++, 0);
     335             :         }
     336             :     }
     337             : 
     338          77 :     return 0;
     339             : }
     340             : 
     341             : /**
     342             :  * Flip the buffer upside-down and put it in the YVU order to revert the
     343             :  * way Mimic encodes frames.
     344             :  */
     345          77 : static void flip_swap_frame(AVFrame *f)
     346             : {
     347             :     int i;
     348          77 :     uint8_t *data_1 = f->data[1];
     349          77 :     f->data[0] = f->data[0] + ( f->height       - 1) * f->linesize[0];
     350          77 :     f->data[1] = f->data[2] + ((f->height >> 1) - 1) * f->linesize[2];
     351          77 :     f->data[2] = data_1     + ((f->height >> 1) - 1) * f->linesize[1];
     352         308 :     for (i = 0; i < 3; i++)
     353         231 :         f->linesize[i] *= -1;
     354          77 : }
     355             : 
     356          77 : static int mimic_decode_frame(AVCodecContext *avctx, void *data,
     357             :                               int *got_frame, AVPacket *avpkt)
     358             : {
     359          77 :     const uint8_t *buf = avpkt->data;
     360          77 :     int buf_size       = avpkt->size;
     361          77 :     int swap_buf_size  = buf_size - MIMIC_HEADER_SIZE;
     362          77 :     MimicContext *ctx  = avctx->priv_data;
     363             :     GetByteContext gb;
     364             :     int is_pframe;
     365             :     int width, height;
     366             :     int quality, num_coeffs;
     367             :     int res;
     368             : 
     369          77 :     if (buf_size <= MIMIC_HEADER_SIZE) {
     370           0 :         av_log(avctx, AV_LOG_ERROR, "insufficient data\n");
     371           0 :         return AVERROR_INVALIDDATA;
     372             :     }
     373             : 
     374          77 :     bytestream2_init(&gb, buf, MIMIC_HEADER_SIZE);
     375          77 :     bytestream2_skip(&gb, 2); /* some constant (always 256) */
     376          77 :     quality    = bytestream2_get_le16u(&gb);
     377          77 :     width      = bytestream2_get_le16u(&gb);
     378          77 :     height     = bytestream2_get_le16u(&gb);
     379          77 :     bytestream2_skip(&gb, 4); /* some constant */
     380          77 :     is_pframe  = bytestream2_get_le32u(&gb);
     381          77 :     num_coeffs = bytestream2_get_byteu(&gb);
     382          77 :     bytestream2_skip(&gb, 3); /* some constant */
     383             : 
     384          77 :     if (!ctx->avctx) {
     385             :         int i;
     386             : 
     387           2 :         if (!(width == 160 && height == 120) &&
     388           2 :             !(width == 320 && height == 240)) {
     389           0 :             av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n");
     390           0 :             return AVERROR_INVALIDDATA;
     391             :         }
     392             : 
     393           2 :         res = ff_set_dimensions(avctx, width, height);
     394           2 :         if (res < 0)
     395           0 :             return res;
     396             : 
     397           2 :         ctx->avctx     = avctx;
     398           2 :         avctx->pix_fmt = AV_PIX_FMT_YUV420P;
     399           8 :         for (i = 0; i < 3; i++) {
     400           6 :             ctx->num_vblocks[i] = AV_CEIL_RSHIFT(height,   3 + !!i);
     401           6 :             ctx->num_hblocks[i] =                width >> (3 + !!i);
     402             :         }
     403          75 :     } else if (width != ctx->avctx->width || height != ctx->avctx->height) {
     404           0 :         avpriv_request_sample(avctx, "Resolution changing");
     405           0 :         return AVERROR_PATCHWELCOME;
     406             :     }
     407             : 
     408          77 :     if (is_pframe && !ctx->frames[ctx->prev_index].f->data[0]) {
     409           0 :         av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n");
     410           0 :         return AVERROR_INVALIDDATA;
     411             :     }
     412             : 
     413          77 :     ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]);
     414          77 :     ctx->frames[ctx->cur_index].f->pict_type = is_pframe ? AV_PICTURE_TYPE_P :
     415             :                                                            AV_PICTURE_TYPE_I;
     416          77 :     if ((res = ff_thread_get_buffer(avctx, &ctx->frames[ctx->cur_index],
     417             :                                     AV_GET_BUFFER_FLAG_REF)) < 0)
     418           0 :         return res;
     419             : 
     420          77 :     ctx->next_prev_index = ctx->cur_index;
     421          77 :     ctx->next_cur_index  = (ctx->cur_index - 1) & 15;
     422             : 
     423          77 :     ff_thread_finish_setup(avctx);
     424             : 
     425          77 :     av_fast_padded_malloc(&ctx->swap_buf, &ctx->swap_buf_size, swap_buf_size);
     426          77 :     if (!ctx->swap_buf)
     427           0 :         return AVERROR(ENOMEM);
     428             : 
     429         154 :     ctx->bbdsp.bswap_buf(ctx->swap_buf,
     430          77 :                          (const uint32_t *) (buf + MIMIC_HEADER_SIZE),
     431             :                          swap_buf_size >> 2);
     432          77 :     init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);
     433             : 
     434          77 :     res = decode(ctx, quality, num_coeffs, !is_pframe);
     435          77 :     ff_thread_report_progress(&ctx->frames[ctx->cur_index], INT_MAX, 0);
     436          77 :     if (res < 0) {
     437           0 :         if (!(avctx->active_thread_type & FF_THREAD_FRAME))
     438           0 :             ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]);
     439           0 :         return res;
     440             :     }
     441             : 
     442          77 :     if ((res = av_frame_ref(data, ctx->frames[ctx->cur_index].f)) < 0)
     443           0 :         return res;
     444          77 :     *got_frame      = 1;
     445             : 
     446          77 :     flip_swap_frame(data);
     447             : 
     448          77 :     ctx->prev_index = ctx->next_prev_index;
     449          77 :     ctx->cur_index  = ctx->next_cur_index;
     450             : 
     451          77 :     return buf_size;
     452             : }
     453             : 
     454             : #if HAVE_THREADS
     455           0 : static av_cold int mimic_init_thread_copy(AVCodecContext *avctx)
     456             : {
     457           0 :     MimicContext *ctx = avctx->priv_data;
     458             :     int i;
     459             : 
     460           0 :     for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) {
     461           0 :         ctx->frames[i].f = av_frame_alloc();
     462           0 :         if (!ctx->frames[i].f) {
     463           0 :             mimic_decode_end(avctx);
     464           0 :             return AVERROR(ENOMEM);
     465             :         }
     466             :     }
     467             : 
     468           0 :     return 0;
     469             : }
     470             : #endif
     471             : 
     472             : AVCodec ff_mimic_decoder = {
     473             :     .name                  = "mimic",
     474             :     .long_name             = NULL_IF_CONFIG_SMALL("Mimic"),
     475             :     .type                  = AVMEDIA_TYPE_VIDEO,
     476             :     .id                    = AV_CODEC_ID_MIMIC,
     477             :     .priv_data_size        = sizeof(MimicContext),
     478             :     .init                  = mimic_decode_init,
     479             :     .close                 = mimic_decode_end,
     480             :     .decode                = mimic_decode_frame,
     481             :     .capabilities          = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     482             :     .update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context),
     483             :     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(mimic_init_thread_copy),
     484             : };

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