LCOV - code coverage report
Current view: top level - libavcodec - mjpegenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 163 188 86.7 %
Date: 2017-12-16 21:16:39 Functions: 9 9 100.0 %

          Line data    Source code
       1             : /*
       2             :  * MJPEG encoder
       3             :  * Copyright (c) 2000, 2001 Fabrice Bellard
       4             :  * Copyright (c) 2003 Alex Beregszaszi
       5             :  * Copyright (c) 2003-2004 Michael Niedermayer
       6             :  *
       7             :  * Support for external huffman table, various fixes (AVID workaround),
       8             :  * aspecting, new decode_frame mechanism and apple mjpeg-b support
       9             :  *                                  by Alex Beregszaszi
      10             :  *
      11             :  * This file is part of FFmpeg.
      12             :  *
      13             :  * FFmpeg is free software; you can redistribute it and/or
      14             :  * modify it under the terms of the GNU Lesser General Public
      15             :  * License as published by the Free Software Foundation; either
      16             :  * version 2.1 of the License, or (at your option) any later version.
      17             :  *
      18             :  * FFmpeg is distributed in the hope that it will be useful,
      19             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      20             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      21             :  * Lesser General Public License for more details.
      22             :  *
      23             :  * You should have received a copy of the GNU Lesser General Public
      24             :  * License along with FFmpeg; if not, write to the Free Software
      25             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      26             :  */
      27             : 
      28             : /**
      29             :  * @file
      30             :  * MJPEG encoder.
      31             :  */
      32             : 
      33             : #include "libavutil/pixdesc.h"
      34             : 
      35             : #include "avcodec.h"
      36             : #include "jpegtables.h"
      37             : #include "mjpegenc_common.h"
      38             : #include "mpegvideo.h"
      39             : #include "mjpeg.h"
      40             : #include "mjpegenc.h"
      41             : 
      42          26 : static int alloc_huffman(MpegEncContext *s)
      43             : {
      44          26 :     MJpegContext *m = s->mjpeg_ctx;
      45             :     size_t num_mbs, num_blocks, num_codes;
      46             :     int blocks_per_mb;
      47             : 
      48             :     // We need to init this here as the mjpeg init is called before the common init,
      49          26 :     s->mb_width  = (s->width  + 15) / 16;
      50          26 :     s->mb_height = (s->height + 15) / 16;
      51             : 
      52          26 :     switch (s->chroma_format) {
      53          18 :     case CHROMA_420: blocks_per_mb =  6; break;
      54           4 :     case CHROMA_422: blocks_per_mb =  8; break;
      55           4 :     case CHROMA_444: blocks_per_mb = 12; break;
      56           0 :     default: av_assert0(0);
      57             :     };
      58             : 
      59             :     // Make sure we have enough space to hold this frame.
      60          26 :     num_mbs = s->mb_width * s->mb_height;
      61          26 :     num_blocks = num_mbs * blocks_per_mb;
      62          26 :     num_codes = num_blocks * 64;
      63             : 
      64          26 :     m->huff_buffer = av_malloc_array(num_codes, sizeof(MJpegHuffmanCode));
      65          26 :     if (!m->huff_buffer)
      66           0 :         return AVERROR(ENOMEM);
      67          26 :     return 0;
      68             : }
      69             : 
      70          30 : av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
      71             : {
      72             :     MJpegContext *m;
      73             : 
      74          30 :     av_assert0(s->slice_context_count == 1);
      75             : 
      76          30 :     if (s->width > 65500 || s->height > 65500) {
      77           0 :         av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
      78           0 :         return AVERROR(EINVAL);
      79             :     }
      80             : 
      81          30 :     m = av_mallocz(sizeof(MJpegContext));
      82          30 :     if (!m)
      83           0 :         return AVERROR(ENOMEM);
      84             : 
      85          30 :     s->min_qcoeff=-1023;
      86          30 :     s->max_qcoeff= 1023;
      87             : 
      88             :     // Build default Huffman tables.
      89             :     // These may be overwritten later with more optimal Huffman tables, but
      90             :     // they are needed at least right now for some processes like trellis.
      91          30 :     ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
      92          30 :                                  m->huff_code_dc_luminance,
      93             :                                  avpriv_mjpeg_bits_dc_luminance,
      94             :                                  avpriv_mjpeg_val_dc);
      95          30 :     ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
      96          30 :                                  m->huff_code_dc_chrominance,
      97             :                                  avpriv_mjpeg_bits_dc_chrominance,
      98             :                                  avpriv_mjpeg_val_dc);
      99          30 :     ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
     100          30 :                                  m->huff_code_ac_luminance,
     101             :                                  avpriv_mjpeg_bits_ac_luminance,
     102             :                                  avpriv_mjpeg_val_ac_luminance);
     103          30 :     ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
     104          30 :                                  m->huff_code_ac_chrominance,
     105             :                                  avpriv_mjpeg_bits_ac_chrominance,
     106             :                                  avpriv_mjpeg_val_ac_chrominance);
     107             : 
     108          30 :     ff_init_uni_ac_vlc(m->huff_size_ac_luminance,   m->uni_ac_vlc_len);
     109          30 :     ff_init_uni_ac_vlc(m->huff_size_ac_chrominance, m->uni_chroma_ac_vlc_len);
     110          30 :     s->intra_ac_vlc_length      =
     111          30 :     s->intra_ac_vlc_last_length = m->uni_ac_vlc_len;
     112          30 :     s->intra_chroma_ac_vlc_length      =
     113          30 :     s->intra_chroma_ac_vlc_last_length = m->uni_chroma_ac_vlc_len;
     114             : 
     115             :     // Buffers start out empty.
     116          30 :     m->huff_ncode = 0;
     117          30 :     s->mjpeg_ctx = m;
     118             : 
     119          30 :     if(s->huffman == HUFFMAN_TABLE_OPTIMAL)
     120          26 :         return alloc_huffman(s);
     121             : 
     122           4 :     return 0;
     123             : }
     124             : 
     125          30 : av_cold void ff_mjpeg_encode_close(MpegEncContext *s)
     126             : {
     127          30 :     av_freep(&s->mjpeg_ctx->huff_buffer);
     128          30 :     av_freep(&s->mjpeg_ctx);
     129          30 : }
     130             : 
     131             : /**
     132             :  * Add code and table_id to the JPEG buffer.
     133             :  *
     134             :  * @param s The MJpegContext which contains the JPEG buffer.
     135             :  * @param table_id Which Huffman table the code belongs to.
     136             :  * @param code The encoded exponent of the coefficients and the run-bits.
     137             :  */
     138    28811107 : static inline void ff_mjpeg_encode_code(MJpegContext *s, uint8_t table_id, int code)
     139             : {
     140    28811107 :     MJpegHuffmanCode *c = &s->huff_buffer[s->huff_ncode++];
     141    28811107 :     c->table_id = table_id;
     142    28811107 :     c->code = code;
     143    28811107 : }
     144             : 
     145             : /**
     146             :  * Add the coefficient's data to the JPEG buffer.
     147             :  *
     148             :  * @param s The MJpegContext which contains the JPEG buffer.
     149             :  * @param table_id Which Huffman table the code belongs to.
     150             :  * @param val The coefficient.
     151             :  * @param run The run-bits.
     152             :  */
     153    26111467 : static void ff_mjpeg_encode_coef(MJpegContext *s, uint8_t table_id, int val, int run)
     154             : {
     155             :     int mant, code;
     156             : 
     157    26111467 :     if (val == 0) {
     158      103825 :         av_assert0(run == 0);
     159      103825 :         ff_mjpeg_encode_code(s, table_id, 0);
     160             :     } else {
     161    26007642 :         mant = val;
     162    26007642 :         if (val < 0) {
     163    12984441 :             val = -val;
     164    12984441 :             mant--;
     165             :         }
     166             : 
     167    26007642 :         code = (run << 4) | (av_log2_16bit(val) + 1);
     168             : 
     169    26007642 :         s->huff_buffer[s->huff_ncode].mant = mant;
     170    26007642 :         ff_mjpeg_encode_code(s, table_id, code);
     171             :     }
     172    26111467 : }
     173             : 
     174             : /**
     175             :  * Add the block's data into the JPEG buffer.
     176             :  *
     177             :  * @param s The MJpegEncContext that contains the JPEG buffer.
     178             :  * @param block The block.
     179             :  * @param n The block's index or number.
     180             :  */
     181     2722788 : static void record_block(MpegEncContext *s, int16_t *block, int n)
     182             : {
     183             :     int i, j, table_id;
     184             :     int component, dc, last_index, val, run;
     185     2722788 :     MJpegContext *m = s->mjpeg_ctx;
     186             : 
     187             :     /* DC coef */
     188     2722788 :     component = (n <= 3 ? 0 : (n&1) + 1);
     189     2722788 :     table_id = (n <= 3 ? 0 : 1);
     190     2722788 :     dc = block[0]; /* overflow is impossible */
     191     2722788 :     val = dc - s->last_dc[component];
     192             : 
     193     2722788 :     ff_mjpeg_encode_coef(m, table_id, val, 0);
     194             : 
     195     2722788 :     s->last_dc[component] = dc;
     196             : 
     197             :     /* AC coefs */
     198             : 
     199     2722788 :     run = 0;
     200     2722788 :     last_index = s->block_last_index[n];
     201     2722788 :     table_id |= 2;
     202             : 
     203    52748192 :     for(i=1;i<=last_index;i++) {
     204    50025404 :         j = s->intra_scantable.permutated[i];
     205    50025404 :         val = block[j];
     206             : 
     207    50025404 :         if (val == 0) {
     208    26636725 :             run++;
     209             :         } else {
     210    46833996 :             while (run >= 16) {
     211       56638 :                 ff_mjpeg_encode_code(m, table_id, 0xf0);
     212       56638 :                 run -= 16;
     213             :             }
     214    23388679 :             ff_mjpeg_encode_coef(m, table_id, val, run);
     215    23388679 :             run = 0;
     216             :         }
     217             :     }
     218             : 
     219             :     /* output EOB only if not already 64 values */
     220     2722788 :     if (last_index < 63 || run != 0)
     221     2643002 :         ff_mjpeg_encode_code(m, table_id, 0);
     222     2722788 : }
     223             : 
     224      359100 : static void encode_block(MpegEncContext *s, int16_t *block, int n)
     225             : {
     226             :     int mant, nbits, code, i, j;
     227             :     int component, dc, run, last_index, val;
     228      359100 :     MJpegContext *m = s->mjpeg_ctx;
     229             :     uint8_t *huff_size_ac;
     230             :     uint16_t *huff_code_ac;
     231             : 
     232             :     /* DC coef */
     233      359100 :     component = (n <= 3 ? 0 : (n&1) + 1);
     234      359100 :     dc = block[0]; /* overflow is impossible */
     235      359100 :     val = dc - s->last_dc[component];
     236      359100 :     if (n < 4) {
     237      239400 :         ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
     238      239400 :         huff_size_ac = m->huff_size_ac_luminance;
     239      239400 :         huff_code_ac = m->huff_code_ac_luminance;
     240             :     } else {
     241      119700 :         ff_mjpeg_encode_dc(&s->pb, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
     242      119700 :         huff_size_ac = m->huff_size_ac_chrominance;
     243      119700 :         huff_code_ac = m->huff_code_ac_chrominance;
     244             :     }
     245      359100 :     s->last_dc[component] = dc;
     246             : 
     247             :     /* AC coefs */
     248             : 
     249      359100 :     run = 0;
     250      359100 :     last_index = s->block_last_index[n];
     251     6879268 :     for(i=1;i<=last_index;i++) {
     252     6520168 :         j = s->intra_scantable.permutated[i];
     253     6520168 :         val = block[j];
     254     6520168 :         if (val == 0) {
     255     3000879 :             run++;
     256             :         } else {
     257     7041596 :             while (run >= 16) {
     258        3018 :                 put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
     259        3018 :                 run -= 16;
     260             :             }
     261     3519289 :             mant = val;
     262     3519289 :             if (val < 0) {
     263     1776140 :                 val = -val;
     264     1776140 :                 mant--;
     265             :             }
     266             : 
     267     3519289 :             nbits= av_log2_16bit(val) + 1;
     268     3519289 :             code = (run << 4) | nbits;
     269             : 
     270     3519289 :             put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
     271             : 
     272     3519289 :             put_sbits(&s->pb, nbits, mant);
     273     3519289 :             run = 0;
     274             :         }
     275             :     }
     276             : 
     277             :     /* output EOB only if not already 64 values */
     278      359100 :     if (last_index < 63 || run != 0)
     279      344417 :         put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
     280      359100 : }
     281             : 
     282      433998 : void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64])
     283             : {
     284             :     int i;
     285      433998 :     if (s->huffman == HUFFMAN_TABLE_OPTIMAL) {
     286      374148 :         if (s->chroma_format == CHROMA_444) {
     287       59850 :             record_block(s, block[0], 0);
     288       59850 :             record_block(s, block[2], 2);
     289       59850 :             record_block(s, block[4], 4);
     290       59850 :             record_block(s, block[8], 8);
     291       59850 :             record_block(s, block[5], 5);
     292       59850 :             record_block(s, block[9], 9);
     293             : 
     294       59850 :             if (16*s->mb_x+8 < s->width) {
     295       59700 :                 record_block(s, block[1], 1);
     296       59700 :                 record_block(s, block[3], 3);
     297       59700 :                 record_block(s, block[6], 6);
     298       59700 :                 record_block(s, block[10], 10);
     299       59700 :                 record_block(s, block[7], 7);
     300       59700 :                 record_block(s, block[11], 11);
     301             :             }
     302             :         } else {
     303     1885788 :             for(i=0;i<5;i++) {
     304     1571490 :                 record_block(s, block[i], i);
     305             :             }
     306      314298 :             if (s->chroma_format == CHROMA_420) {
     307      254448 :                 record_block(s, block[5], 5);
     308             :             } else {
     309       59850 :                 record_block(s, block[6], 6);
     310       59850 :                 record_block(s, block[5], 5);
     311       59850 :                 record_block(s, block[7], 7);
     312             :             }
     313             :         }
     314             :     } else {
     315       59850 :         if (s->chroma_format == CHROMA_444) {
     316           0 :             encode_block(s, block[0], 0);
     317           0 :             encode_block(s, block[2], 2);
     318           0 :             encode_block(s, block[4], 4);
     319           0 :             encode_block(s, block[8], 8);
     320           0 :             encode_block(s, block[5], 5);
     321           0 :             encode_block(s, block[9], 9);
     322             : 
     323           0 :             if (16*s->mb_x+8 < s->width) {
     324           0 :                 encode_block(s, block[1], 1);
     325           0 :                 encode_block(s, block[3], 3);
     326           0 :                 encode_block(s, block[6], 6);
     327           0 :                 encode_block(s, block[10], 10);
     328           0 :                 encode_block(s, block[7], 7);
     329           0 :                 encode_block(s, block[11], 11);
     330             :             }
     331             :         } else {
     332      359100 :             for(i=0;i<5;i++) {
     333      299250 :                 encode_block(s, block[i], i);
     334             :             }
     335       59850 :             if (s->chroma_format == CHROMA_420) {
     336       59850 :                 encode_block(s, block[5], 5);
     337             :             } else {
     338           0 :                 encode_block(s, block[6], 6);
     339           0 :                 encode_block(s, block[5], 5);
     340           0 :                 encode_block(s, block[7], 7);
     341             :             }
     342             :         }
     343             : 
     344       59850 :         s->i_tex_bits += get_bits_diff(s);
     345             :     }
     346      433998 : }
     347             : 
     348             : #if CONFIG_AMV_ENCODER
     349             : // maximum over s->mjpeg_vsample[i]
     350             : #define V_MAX 2
     351         200 : static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
     352             :                               const AVFrame *pic_arg, int *got_packet)
     353             : {
     354         200 :     MpegEncContext *s = avctx->priv_data;
     355             :     AVFrame *pic;
     356             :     int i, ret;
     357             :     int chroma_h_shift, chroma_v_shift;
     358             : 
     359         200 :     av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
     360             : 
     361         200 :     if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
     362           0 :         av_log(avctx, AV_LOG_ERROR,
     363             :                "Heights which are not a multiple of 16 might fail with some decoders, "
     364             :                "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height);
     365           0 :         av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos "
     366             :                "with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n");
     367           0 :         return AVERROR_EXPERIMENTAL;
     368             :     }
     369             : 
     370         200 :     pic = av_frame_clone(pic_arg);
     371         200 :     if (!pic)
     372           0 :         return AVERROR(ENOMEM);
     373             :     //picture should be flipped upside-down
     374         800 :     for(i=0; i < 3; i++) {
     375         600 :         int vsample = i ? 2 >> chroma_v_shift : 2;
     376         600 :         pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1);
     377         600 :         pic->linesize[i] *= -1;
     378             :     }
     379         200 :     ret = ff_mpv_encode_picture(avctx, pkt, pic, got_packet);
     380         200 :     av_frame_free(&pic);
     381         200 :     return ret;
     382             : }
     383             : #endif
     384             : 
     385             : #define OFFSET(x) offsetof(MpegEncContext, x)
     386             : #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
     387             : static const AVOption options[] = {
     388             : FF_MPV_COMMON_OPTS
     389             : { "pred", "Prediction method", OFFSET(pred), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 3, VE, "pred" },
     390             :     { "left",   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "pred" },
     391             :     { "plane",  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "pred" },
     392             :     { "median", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 3 }, INT_MIN, INT_MAX, VE, "pred" },
     393             : { "huffman", "Huffman table strategy", OFFSET(huffman), AV_OPT_TYPE_INT, { .i64 = HUFFMAN_TABLE_OPTIMAL }, 0, NB_HUFFMAN_TABLE_OPTION - 1, VE, "huffman" },
     394             :     { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_DEFAULT }, INT_MIN, INT_MAX, VE, "huffman" },
     395             :     { "optimal", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = HUFFMAN_TABLE_OPTIMAL }, INT_MIN, INT_MAX, VE, "huffman" },
     396             : { NULL},
     397             : };
     398             : 
     399             : #if CONFIG_MJPEG_ENCODER
     400             : static const AVClass mjpeg_class = {
     401             :     .class_name = "mjpeg encoder",
     402             :     .item_name  = av_default_item_name,
     403             :     .option     = options,
     404             :     .version    = LIBAVUTIL_VERSION_INT,
     405             : };
     406             : 
     407             : AVCodec ff_mjpeg_encoder = {
     408             :     .name           = "mjpeg",
     409             :     .long_name      = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
     410             :     .type           = AVMEDIA_TYPE_VIDEO,
     411             :     .id             = AV_CODEC_ID_MJPEG,
     412             :     .priv_data_size = sizeof(MpegEncContext),
     413             :     .init           = ff_mpv_encode_init,
     414             :     .encode2        = ff_mpv_encode_picture,
     415             :     .close          = ff_mpv_encode_end,
     416             :     .capabilities   = AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_INTRA_ONLY,
     417             :     .pix_fmts       = (const enum AVPixelFormat[]) {
     418             :         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_NONE
     419             :     },
     420             :     .priv_class     = &mjpeg_class,
     421             : };
     422             : #endif
     423             : 
     424             : #if CONFIG_AMV_ENCODER
     425             : static const AVClass amv_class = {
     426             :     .class_name = "amv encoder",
     427             :     .item_name  = av_default_item_name,
     428             :     .option     = options,
     429             :     .version    = LIBAVUTIL_VERSION_INT,
     430             : };
     431             : 
     432             : AVCodec ff_amv_encoder = {
     433             :     .name           = "amv",
     434             :     .long_name      = NULL_IF_CONFIG_SMALL("AMV Video"),
     435             :     .type           = AVMEDIA_TYPE_VIDEO,
     436             :     .id             = AV_CODEC_ID_AMV,
     437             :     .priv_data_size = sizeof(MpegEncContext),
     438             :     .init           = ff_mpv_encode_init,
     439             :     .encode2        = amv_encode_picture,
     440             :     .close          = ff_mpv_encode_end,
     441             :     .pix_fmts       = (const enum AVPixelFormat[]) {
     442             :         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_NONE
     443             :     },
     444             :     .priv_class     = &amv_class,
     445             : };
     446             : #endif

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