diff options
Diffstat (limited to 'libavcodec/cinepakenc.c')
| -rw-r--r-- | libavcodec/cinepakenc.c | 1335 |
1 files changed, 1335 insertions, 0 deletions
diff --git a/libavcodec/cinepakenc.c b/libavcodec/cinepakenc.c new file mode 100644 index 0000000000..2896fa1806 --- /dev/null +++ b/libavcodec/cinepakenc.c @@ -0,0 +1,1335 @@ +/* + * Cinepak encoder (c) 2011 Tomas Härdin + * http://titan.codemill.se/~tomhar/cinepakenc.patch + * + * Fixes and improvements, vintage decoders compatibility + * (c) 2013, 2014 Rl, Aetey Global Technologies AB + +Permission is hereby granted, free of charge, to any person obtaining a +copy of this software and associated documentation files (the "Software"), +to deal in the Software without restriction, including without limitation +the rights to use, copy, modify, merge, publish, distribute, sublicense, +and/or sell copies of the Software, and to permit persons to whom the +Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included +in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR +OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +OTHER DEALINGS IN THE SOFTWARE. + + * TODO: + * - optimize: color space conversion, ... + * - implement options to set the min/max number of strips? + * MAYBE: + * - "optimally" split the frame into several non-regular areas + * using a separate codebook pair for each area and approximating + * the area by several rectangular strips (generally not full width ones) + * (use quadtree splitting? a simple fixed-granularity grid?) + * + * + * version 2014-01-23 Rl + * - added option handling for flexibility + * + * version 2014-01-21 Rl + * - believe it or not, now we get even smaller files, with better quality + * (which means I missed an optimization earlier :) + * + * version 2014-01-20 Rl + * - made the encoder compatible with vintage decoders + * and added some yet unused code for possible future + * incremental codebook updates + * - fixed a small memory leak + * + * version 2013-04-28 Rl + * - bugfixed codebook optimization logic + * + * version 2013-02-14 Rl + * "Valentine's Day" version: + * - made strip division more robust + * - minimized bruteforcing the number of strips, + * (costs some R/D but speeds up compession a lot), the heuristic + * assumption is that score as a function of the number of strips has + * one wide minimum which moves slowly, of course not fully true + * - simplified codebook generation, + * the old code was meant for other optimizations than we actually do + * - optimized the codebook generation / error estimation for MODE_MC + * + * version 2013-02-12 Rl + * - separated codebook training sets, avoided the transfer of wasted bytes, + * which yields both better quality and smaller files + * - now using the correct colorspace (TODO: move conversion to libswscale) + * + * version 2013-02-08 Rl + * - fixes/optimization in multistrip encoding and codebook size choice, + * quality/bitrate is now better than that of the binary proprietary encoder + */ + +#include "libavutil/intreadwrite.h" +#include "avcodec.h" +#include "libavutil/lfg.h" +#include "elbg.h" +#include "internal.h" + +#include "libavutil/avassert.h" +#include "libavutil/opt.h" + +#define CVID_HEADER_SIZE 10 +#define STRIP_HEADER_SIZE 12 +#define CHUNK_HEADER_SIZE 4 + +#define MB_SIZE 4 //4x4 MBs +#define MB_AREA (MB_SIZE*MB_SIZE) + +#define VECTOR_MAX 6 //six or four entries per vector depending on format +#define CODEBOOK_MAX 256 //size of a codebook + +#define MAX_STRIPS 32 //Note: having fewer choices regarding the number of strips speeds up encoding (obviously) +#define MIN_STRIPS 1 //Note: having more strips speeds up encoding the frame (this is less obvious) +// MAX_STRIPS limits the maximum quality you can reach +// when you want hight quality on high resolutions, +// MIN_STRIPS limits the minimum efficiently encodable bit rate +// on low resolutions +// the numbers are only used for brute force optimization for the first frame, +// for the following frames they are adaptively readjusted +// NOTE the decoder in ffmpeg has its own arbitrary limitation on the number +// of strips, currently 32 + +typedef enum { + MODE_V1_ONLY = 0, + MODE_V1_V4, + MODE_MC, + + MODE_COUNT, +} CinepakMode; + +typedef enum { + ENC_V1, + ENC_V4, + ENC_SKIP, + + ENC_UNCERTAIN +} mb_encoding; + +typedef struct { + int v1_vector; //index into v1 codebook + int v1_error; //error when using V1 encoding + int v4_vector[4]; //indices into v4 codebooks + int v4_error; //error when using V4 encoding + int skip_error; //error when block is skipped (aka copied from last frame) + mb_encoding best_encoding; //last result from calculate_mode_score() +} mb_info; + +typedef struct { + int v1_codebook[CODEBOOK_MAX*VECTOR_MAX]; + int v4_codebook[CODEBOOK_MAX*VECTOR_MAX]; + int v1_size; + int v4_size; + CinepakMode mode; +} strip_info; + +typedef struct { + const AVClass *class; + AVCodecContext *avctx; + unsigned char *pict_bufs[4], *strip_buf, *frame_buf; + AVFrame *last_frame; + AVFrame *best_frame; + AVFrame *scratch_frame; + AVFrame *input_frame; + enum AVPixelFormat pix_fmt; + int w, h; + int frame_buf_size; + int curframe, keyint; + AVLFG randctx; + uint64_t lambda; + int *codebook_input; + int *codebook_closest; + mb_info *mb; //MB RD state + int min_strips; //the current limit + int max_strips; //the current limit +#ifdef CINEPAKENC_DEBUG + mb_info *best_mb; //TODO: remove. only used for printing stats + int num_v1_mode, num_v4_mode, num_mc_mode; + int num_v1_encs, num_v4_encs, num_skips; +#endif +// options + int max_extra_cb_iterations; + int skip_empty_cb; + int min_min_strips; + int max_max_strips; + int strip_number_delta_range; +} CinepakEncContext; + +#define OFFSET(x) offsetof(CinepakEncContext, x) +#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM +static const AVOption options[] = { + { "max_extra_cb_iterations", "Max extra codebook recalculation passes, more is better and slower", OFFSET(max_extra_cb_iterations), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, VE }, + { "skip_empty_cb", "Avoid wasting bytes, ignore vintage MacOS decoder", OFFSET(skip_empty_cb), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE }, + { "max_strips", "Limit strips/frame, vintage compatible is 1..3, otherwise the more the better", OFFSET(max_max_strips), AV_OPT_TYPE_INT, { .i64 = 3 }, MIN_STRIPS, MAX_STRIPS, VE }, + { "min_strips", "Enforce min strips/frame, more is worse and faster, must be <= max_strips", OFFSET(min_min_strips), AV_OPT_TYPE_INT, { .i64 = MIN_STRIPS }, MIN_STRIPS, MAX_STRIPS, VE }, + { "strip_number_adaptivity", "How fast the strip number adapts, more is slightly better, much slower", OFFSET(strip_number_delta_range), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_STRIPS-MIN_STRIPS, VE }, + { NULL }, +}; + +static const AVClass cinepak_class = { + .class_name = "cinepak", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +static av_cold int cinepak_encode_init(AVCodecContext *avctx) +{ + CinepakEncContext *s = avctx->priv_data; + int x, mb_count, strip_buf_size, frame_buf_size; + + if (avctx->width & 3 || avctx->height & 3) { + av_log(avctx, AV_LOG_ERROR, "width and height must be multiples of four (got %ix%i)\n", + avctx->width, avctx->height); + return AVERROR(EINVAL); + } + + if (s->min_min_strips > s->max_max_strips) { + av_log(avctx, AV_LOG_ERROR, "minimal number of strips can not exceed maximal (got %i and %i)\n", + s->min_min_strips, s->max_max_strips); + return AVERROR(EINVAL); + } + + if (!(s->last_frame = av_frame_alloc())) + return AVERROR(ENOMEM); + if (!(s->best_frame = av_frame_alloc())) + goto enomem; + if (!(s->scratch_frame = av_frame_alloc())) + goto enomem; + if (avctx->pix_fmt == AV_PIX_FMT_RGB24) + if (!(s->input_frame = av_frame_alloc())) + goto enomem; + + if (!(s->codebook_input = av_malloc(sizeof(int) * (avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4) * (avctx->width * avctx->height) >> 2))) + goto enomem; + + if (!(s->codebook_closest = av_malloc(sizeof(int) * (avctx->width * avctx->height) >> 2))) + goto enomem; + + for(x = 0; x < (avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 4 : 3); x++) + if(!(s->pict_bufs[x] = av_malloc((avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4) * (avctx->width * avctx->height) >> 2))) + goto enomem; + + mb_count = avctx->width * avctx->height / MB_AREA; + + //the largest possible chunk is 0x31 with all MBs encoded in V4 mode + //and full codebooks being replaced in INTER mode, + // which is 34 bits per MB + //and 2*256 extra flag bits per strip + strip_buf_size = STRIP_HEADER_SIZE + 3 * CHUNK_HEADER_SIZE + 2 * VECTOR_MAX * CODEBOOK_MAX + 4 * (mb_count + (mb_count + 15) / 16) + (2 * CODEBOOK_MAX)/8; + + frame_buf_size = CVID_HEADER_SIZE + s->max_max_strips * strip_buf_size; + + if (!(s->strip_buf = av_malloc(strip_buf_size))) + goto enomem; + + if (!(s->frame_buf = av_malloc(frame_buf_size))) + goto enomem; + + if (!(s->mb = av_malloc_array(mb_count, sizeof(mb_info)))) + goto enomem; + +#ifdef CINEPAKENC_DEBUG + if (!(s->best_mb = av_malloc_array(mb_count, sizeof(mb_info)))) + goto enomem; +#endif + + av_lfg_init(&s->randctx, 1); + s->avctx = avctx; + s->w = avctx->width; + s->h = avctx->height; + s->frame_buf_size = frame_buf_size; + s->curframe = 0; + s->keyint = avctx->keyint_min; + s->pix_fmt = avctx->pix_fmt; + + //set up AVFrames + s->last_frame->data[0] = s->pict_bufs[0]; + s->last_frame->linesize[0] = s->w; + s->best_frame->data[0] = s->pict_bufs[1]; + s->best_frame->linesize[0] = s->w; + s->scratch_frame->data[0] = s->pict_bufs[2]; + s->scratch_frame->linesize[0] = s->w; + + if (s->pix_fmt == AV_PIX_FMT_RGB24) { + s->last_frame->data[1] = s->last_frame->data[0] + s->w * s->h; + s->last_frame->data[2] = s->last_frame->data[1] + ((s->w * s->h) >> 2); + s->last_frame->linesize[1] = s->last_frame->linesize[2] = s->w >> 1; + + s->best_frame->data[1] = s->best_frame->data[0] + s->w * s->h; + s->best_frame->data[2] = s->best_frame->data[1] + ((s->w * s->h) >> 2); + s->best_frame->linesize[1] = s->best_frame->linesize[2] = s->w >> 1; + + s->scratch_frame->data[1] = s->scratch_frame->data[0] + s->w * s->h; + s->scratch_frame->data[2] = s->scratch_frame->data[1] + ((s->w * s->h) >> 2); + s->scratch_frame->linesize[1] = s->scratch_frame->linesize[2] = s->w >> 1; + + s->input_frame->data[0] = s->pict_bufs[3]; + s->input_frame->linesize[0] = s->w; + s->input_frame->data[1] = s->input_frame->data[0] + s->w * s->h; + s->input_frame->data[2] = s->input_frame->data[1] + ((s->w * s->h) >> 2); + s->input_frame->linesize[1] = s->input_frame->linesize[2] = s->w >> 1; + } + + s->min_strips = s->min_min_strips; + s->max_strips = s->max_max_strips; + +#ifdef CINEPAKENC_DEBUG + s->num_v1_mode = s->num_v4_mode = s->num_mc_mode = s->num_v1_encs = s->num_v4_encs = s->num_skips = 0; +#endif + + return 0; + +enomem: + av_frame_free(&s->last_frame); + av_frame_free(&s->best_frame); + av_frame_free(&s->scratch_frame); + if (avctx->pix_fmt == AV_PIX_FMT_RGB24) + av_frame_free(&s->input_frame); + av_freep(&s->codebook_input); + av_freep(&s->codebook_closest); + av_freep(&s->strip_buf); + av_freep(&s->frame_buf); + av_freep(&s->mb); +#ifdef CINEPAKENC_DEBUG + av_freep(&s->best_mb); +#endif + + for(x = 0; x < (avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 4 : 3); x++) + av_freep(&s->pict_bufs[x]); + + return AVERROR(ENOMEM); +} + +static int64_t calculate_mode_score(CinepakEncContext *s, int h, strip_info *info, int report, int *training_set_v1_shrunk, int *training_set_v4_shrunk +#ifdef CINEPAK_REPORT_SERR +, int64_t *serr +#endif +) +{ + //score = FF_LAMBDA_SCALE * error + lambda * bits + int x; + int entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4; + int mb_count = s->w * h / MB_AREA; + mb_info *mb; + int64_t score1, score2, score3; + int64_t ret = s->lambda * ((info->v1_size ? CHUNK_HEADER_SIZE + info->v1_size * entry_size : 0) + + (info->v4_size ? CHUNK_HEADER_SIZE + info->v4_size * entry_size : 0) + + CHUNK_HEADER_SIZE) << 3; + + //av_log(s->avctx, AV_LOG_INFO, "sizes %3i %3i -> %9"PRId64" score mb_count %i", info->v1_size, info->v4_size, ret, mb_count); + +#ifdef CINEPAK_REPORT_SERR + *serr = 0; +#endif + + switch(info->mode) { + case MODE_V1_ONLY: + //one byte per MB + ret += s->lambda * 8 * mb_count; + +// while calculating we assume all blocks are ENC_V1 + for(x = 0; x < mb_count; x++) { + mb = &s->mb[x]; + ret += FF_LAMBDA_SCALE * mb->v1_error; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->v1_error; +#endif +// this function is never called for report in MODE_V1_ONLY +// if(!report) + mb->best_encoding = ENC_V1; + } + + break; + case MODE_V1_V4: + //9 or 33 bits per MB + if(report) { +// no moves between the corresponding training sets are allowed + *training_set_v1_shrunk = *training_set_v4_shrunk = 0; + for(x = 0; x < mb_count; x++) { + int mberr; + mb = &s->mb[x]; + if(mb->best_encoding == ENC_V1) + score1 = s->lambda * 9 + FF_LAMBDA_SCALE * (mberr=mb->v1_error); + else + score1 = s->lambda * 33 + FF_LAMBDA_SCALE * (mberr=mb->v4_error); + ret += score1; +#ifdef CINEPAK_REPORT_SERR + *serr += mberr; +#endif + } + } else { // find best mode per block + for(x = 0; x < mb_count; x++) { + mb = &s->mb[x]; + score1 = s->lambda * 9 + FF_LAMBDA_SCALE * mb->v1_error; + score2 = s->lambda * 33 + FF_LAMBDA_SCALE * mb->v4_error; + + if(score1 <= score2) { + ret += score1; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->v1_error; +#endif + mb->best_encoding = ENC_V1; + } else { + ret += score2; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->v4_error; +#endif + mb->best_encoding = ENC_V4; + } + } + } + + break; + case MODE_MC: + //1, 10 or 34 bits per MB + if(report) { + int v1_shrunk = 0, v4_shrunk = 0; + for(x = 0; x < mb_count; x++) { + mb = &s->mb[x]; +// it is OK to move blocks to ENC_SKIP here +// but not to any codebook encoding! + score1 = s->lambda * 1 + FF_LAMBDA_SCALE * mb->skip_error; + if(mb->best_encoding == ENC_SKIP) { + ret += score1; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->skip_error; +#endif + } else if(mb->best_encoding == ENC_V1) { + if((score2=s->lambda * 10 + FF_LAMBDA_SCALE * mb->v1_error) >= score1) { + mb->best_encoding = ENC_SKIP; + ++v1_shrunk; + ret += score1; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->skip_error; +#endif + } else { + ret += score2; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->v1_error; +#endif + } + } else { + if((score3=s->lambda * 34 + FF_LAMBDA_SCALE * mb->v4_error) >= score1) { + mb->best_encoding = ENC_SKIP; + ++v4_shrunk; + ret += score1; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->skip_error; +#endif + } else { + ret += score3; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->v4_error; +#endif + } + } + } + *training_set_v1_shrunk = v1_shrunk; + *training_set_v4_shrunk = v4_shrunk; + } else { // find best mode per block + for(x = 0; x < mb_count; x++) { + mb = &s->mb[x]; + score1 = s->lambda * 1 + FF_LAMBDA_SCALE * mb->skip_error; + score2 = s->lambda * 10 + FF_LAMBDA_SCALE * mb->v1_error; + score3 = s->lambda * 34 + FF_LAMBDA_SCALE * mb->v4_error; + + if(score1 <= score2 && score1 <= score3) { + ret += score1; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->skip_error; +#endif + mb->best_encoding = ENC_SKIP; + } else if(score2 <= score3) { + ret += score2; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->v1_error; +#endif + mb->best_encoding = ENC_V1; + } else { + ret += score3; +#ifdef CINEPAK_REPORT_SERR + *serr += mb->v4_error; +#endif + mb->best_encoding = ENC_V4; + } + } + } + + break; + } + + return ret; +} + +static int write_chunk_header(unsigned char *buf, int chunk_type, int chunk_size) +{ + buf[0] = chunk_type; + AV_WB24(&buf[1], chunk_size + CHUNK_HEADER_SIZE); + return CHUNK_HEADER_SIZE; +} + +static int encode_codebook(CinepakEncContext *s, int *codebook, int size, int chunk_type_yuv, int chunk_type_gray, unsigned char *buf) +{ + int x, y, ret, entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4; + int incremental_codebook_replacement_mode = 0; // hardcoded here, + // the compiler should notice that this is a constant -- rl + + ret = write_chunk_header(buf, + s->pix_fmt == AV_PIX_FMT_RGB24 ? + chunk_type_yuv+(incremental_codebook_replacement_mode?1:0) : + chunk_type_gray+(incremental_codebook_replacement_mode?1:0), + entry_size * size + + (incremental_codebook_replacement_mode?(size+31)/32*4:0) ); + +// we do codebook encoding according to the "intra" mode +// but we keep the "dead" code for reference in case we will want +// to use incremental codebook updates (which actually would give us +// "kind of" motion compensation, especially in 1 strip/frame case) -- rl +// (of course, the code will be not useful as-is) + if(incremental_codebook_replacement_mode) { + int flags = 0; + int flagsind; + for(x = 0; x < size; x++) { + if(flags == 0) { + flagsind = ret; + ret += 4; + flags = 0x80000000; + } else + flags = ((flags>>1) | 0x80000000); + for(y = 0; y < entry_size; y++) + buf[ret++] = codebook[y + x*entry_size] ^ (y >= 4 ? 0x80 : 0); + if((flags&0xffffffff) == 0xffffffff) { + AV_WB32(&buf[flagsind], flags); + flags = 0; + } + } + if(flags) + AV_WB32(&buf[flagsind], flags); + } else + for(x = 0; x < size; x++) + for(y = 0; y < entry_size; y++) + buf[ret++] = codebook[y + x*entry_size] ^ (y >= 4 ? 0x80 : 0); + + return ret; +} + +//sets out to the sub picture starting at (x,y) in in +static void get_sub_picture(CinepakEncContext *s, int x, int y, AVPicture *in, AVPicture *out) +{ + out->data[0] = in->data[0] + x + y * in->linesize[0]; + out->linesize[0] = in->linesize[0]; + + if(s->pix_fmt == AV_PIX_FMT_RGB24) { + out->data[1] = in->data[1] + (x >> 1) + (y >> 1) * in->linesize[1]; + out->linesize[1] = in->linesize[1]; + + out->data[2] = in->data[2] + (x >> 1) + (y >> 1) * in->linesize[2]; + out->linesize[2] = in->linesize[2]; + } +} + +//decodes the V1 vector in mb into the 4x4 MB pointed to by sub_pict +static void decode_v1_vector(CinepakEncContext *s, AVPicture *sub_pict, int v1_vector, strip_info *info) +{ + int entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4; + + sub_pict->data[0][0] = + sub_pict->data[0][1] = + sub_pict->data[0][ sub_pict->linesize[0]] = + sub_pict->data[0][1+ sub_pict->linesize[0]] = info->v1_codebook[v1_vector*entry_size]; + + sub_pict->data[0][2] = + sub_pict->data[0][3] = + sub_pict->data[0][2+ sub_pict->linesize[0]] = + sub_pict->data[0][3+ sub_pict->linesize[0]] = info->v1_codebook[v1_vector*entry_size+1]; + + sub_pict->data[0][2*sub_pict->linesize[0]] = + sub_pict->data[0][1+2*sub_pict->linesize[0]] = + sub_pict->data[0][ 3*sub_pict->linesize[0]] = + sub_pict->data[0][1+3*sub_pict->linesize[0]] = info->v1_codebook[v1_vector*entry_size+2]; + + sub_pict->data[0][2+2*sub_pict->linesize[0]] = + sub_pict->data[0][3+2*sub_pict->linesize[0]] = + sub_pict->data[0][2+3*sub_pict->linesize[0]] = + sub_pict->data[0][3+3*sub_pict->linesize[0]] = info->v1_codebook[v1_vector*entry_size+3]; + + if(s->pix_fmt == AV_PIX_FMT_RGB24) { + sub_pict->data[1][0] = + sub_pict->data[1][1] = + sub_pict->data[1][ sub_pict->linesize[1]] = + sub_pict->data[1][1+ sub_pict->linesize[1]] = info->v1_codebook[v1_vector*entry_size+4]; + + sub_pict->data[2][0] = + sub_pict->data[2][1] = + sub_pict->data[2][ sub_pict->linesize[2]] = + sub_pict->data[2][1+ sub_pict->linesize[2]] = info->v1_codebook[v1_vector*entry_size+5]; + } +} + +//decodes the V4 vectors in mb into the 4x4 MB pointed to by sub_pict +static void decode_v4_vector(CinepakEncContext *s, AVPicture *sub_pict, int *v4_vector, strip_info *info) +{ + int i, x, y, entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4; + + for(i = y = 0; y < 4; y += 2) { + for(x = 0; x < 4; x += 2, i++) { + sub_pict->data[0][x + y*sub_pict->linesize[0]] = info->v4_codebook[v4_vector[i]*entry_size]; + sub_pict->data[0][x+1 + y*sub_pict->linesize[0]] = info->v4_codebook[v4_vector[i]*entry_size+1]; + sub_pict->data[0][x + (y+1)*sub_pict->linesize[0]] = info->v4_codebook[v4_vector[i]*entry_size+2]; + sub_pict->data[0][x+1 + (y+1)*sub_pict->linesize[0]] = info->v4_codebook[v4_vector[i]*entry_size+3]; + + if(s->pix_fmt == AV_PIX_FMT_RGB24) { + sub_pict->data[1][(x>>1) + (y>>1)*sub_pict->linesize[1]] = info->v4_codebook[v4_vector[i]*entry_size+4]; + sub_pict->data[2][(x>>1) + (y>>1)*sub_pict->linesize[2]] = info->v4_codebook[v4_vector[i]*entry_size+5]; + } + } + } +} + +static void copy_mb(CinepakEncContext *s, AVPicture *a, AVPicture *b) +{ + int y, p; + + for(y = 0; y < MB_SIZE; y++) { + memcpy(a->data[0]+y*a->linesize[0], b->data[0]+y*b->linesize[0], + MB_SIZE); + } + + if(s->pix_fmt == AV_PIX_FMT_RGB24) { + for(p = 1; p <= 2; p++) { + for(y = 0; y < MB_SIZE/2; y++) { + memcpy(a->data[p] + y*a->linesize[p], + b->data[p] + y*b->linesize[p], + MB_SIZE/2); + } + } + } +} + +static int encode_mode(CinepakEncContext *s, int h, AVPicture *scratch_pict, AVPicture *last_pict, strip_info *info, unsigned char *buf) +{ + int x, y, z, flags, bits, temp_size, header_ofs, ret = 0, mb_count = s->w * h / MB_AREA; + int needs_extra_bit, should_write_temp; + unsigned char temp[64]; //32/2 = 16 V4 blocks at 4 B each -> 64 B + mb_info *mb; + AVPicture sub_scratch = {{0}}, sub_last = {{0}}; + + //encode codebooks +////// MacOS vintage decoder compatibility dictates the presence of +////// the codebook chunk even when the codebook is empty - pretty dumb... +////// and also the certain order of the codebook chunks -- rl + if(info->v4_size || !s->skip_empty_cb) + ret += encode_codebook(s, info->v4_codebook, info->v4_size, 0x20, 0x24, buf + ret); + + if(info->v1_size || !s->skip_empty_cb) + ret += encode_codebook(s, info->v1_codebook, info->v1_size, 0x22, 0x26, buf + ret); + + //update scratch picture + for(z = y = 0; y < h; y += MB_SIZE) { + for(x = 0; x < s->w; x += MB_SIZE, z++) { + mb = &s->mb[z]; + + get_sub_picture(s, x, y, scratch_pict, &sub_scratch); + + if(info->mode == MODE_MC && mb->best_encoding == ENC_SKIP) { + get_sub_picture(s, x, y, last_pict, &sub_last); + copy_mb(s, &sub_scratch, &sub_last); + } else if(info->mode == MODE_V1_ONLY || mb->best_encoding == ENC_V1) + decode_v1_vector(s, &sub_scratch, mb->v1_vector, info); + else + decode_v4_vector(s, &sub_scratch, mb->v4_vector, info); + } + } + + switch(info->mode) { + case MODE_V1_ONLY: + //av_log(s->avctx, AV_LOG_INFO, "mb_count = %i\n", mb_count); + ret += write_chunk_header(buf + ret, 0x32, mb_count); + + for(x = 0; x < mb_count; x++) + buf[ret++] = s->mb[x].v1_vector; + + break; + case MODE_V1_V4: + //remember header position + header_ofs = ret; + ret += CHUNK_HEADER_SIZE; + + for(x = 0; x < mb_count; x += 32) { + flags = 0; + for(y = x; y < FFMIN(x+32, mb_count); y++) + if(s->mb[y].best_encoding == ENC_V4) + flags |= 1 << (31 - y + x); + + AV_WB32(&buf[ret], flags); + ret += 4; + + for(y = x; y < FFMIN(x+32, mb_count); y++) { + mb = &s->mb[y]; + + if(mb->best_encoding == ENC_V1) + buf[ret++] = mb->v1_vector; + else + for(z = 0; z < 4; z++) + buf[ret++] = mb->v4_vector[z]; + } + } + + write_chunk_header(buf + header_ofs, 0x30, ret - header_ofs - CHUNK_HEADER_SIZE); + + break; + case MODE_MC: + //remember header position + header_ofs = ret; + ret += CHUNK_HEADER_SIZE; + flags = bits = temp_size = 0; + + for(x = 0; x < mb_count; x++) { + mb = &s->mb[x]; + flags |= (mb->best_encoding != ENC_SKIP) << (31 - bits++); + needs_extra_bit = 0; + should_write_temp = 0; + + if(mb->best_encoding != ENC_SKIP) { + if(bits < 32) + flags |= (mb->best_encoding == ENC_V4) << (31 - bits++); + else + needs_extra_bit = 1; + } + + if(bits == 32) { + AV_WB32(&buf[ret], flags); + ret += 4; + flags = bits = 0; + + if(mb->best_encoding == ENC_SKIP || needs_extra_bit) { + memcpy(&buf[ret], temp, temp_size); + ret += temp_size; + temp_size = 0; + } else + should_write_temp = 1; + } + + if(needs_extra_bit) { + flags = (mb->best_encoding == ENC_V4) << 31; + bits = 1; + } + + if(mb->best_encoding == ENC_V1) + temp[temp_size++] = mb->v1_vector; + else if(mb->best_encoding == ENC_V4) + for(z = 0; z < 4; z++) + temp[temp_size++] = mb->v4_vector[z]; + + if(should_write_temp) { + memcpy(&buf[ret], temp, temp_size); + ret += temp_size; + temp_size = 0; + } + } + + if(bits > 0) { + AV_WB32(&buf[ret], flags); + ret += 4; + memcpy(&buf[ret], temp, temp_size); + ret += temp_size; + } + + write_chunk_header(buf + header_ofs, 0x31, ret - header_ofs - CHUNK_HEADER_SIZE); + + break; + } + + return ret; +} + +//computes distortion of 4x4 MB in b compared to a +static int compute_mb_distortion(CinepakEncContext *s, AVPicture *a, AVPicture *b) +{ + int x, y, p, d, ret = 0; + + for(y = 0; y < MB_SIZE; y++) { + for(x = 0; x < MB_SIZE; x++) { + d = a->data[0][x + y*a->linesize[0]] - b->data[0][x + y*b->linesize[0]]; + ret += d*d; + } + } + + if(s->pix_fmt == AV_PIX_FMT_RGB24) { + for(p = 1; p <= 2; p++) { + for(y = 0; y < MB_SIZE/2; y++) { + for(x = 0; x < MB_SIZE/2; x++) { + d = a->data[p][x + y*a->linesize[p]] - b->data[p][x + y*b->linesize[p]]; + ret += d*d; + } + } + } + } + + return ret; +} + +// return the possibly adjusted size of the codebook +#define CERTAIN(x) ((x)!=ENC_UNCERTAIN) +static int quantize(CinepakEncContext *s, int h, AVPicture *pict, + int v1mode, strip_info *info, + mb_encoding encoding) +{ + int x, y, i, j, k, x2, y2, x3, y3, plane, shift, mbn; + int entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4; + int *codebook = v1mode ? info->v1_codebook : info->v4_codebook; + int size = v1mode ? info->v1_size : info->v4_size; + int64_t total_error = 0; + uint8_t vq_pict_buf[(MB_AREA*3)/2]; + AVPicture sub_pict, vq_pict; + + for(mbn = i = y = 0; y < h; y += MB_SIZE) { + for(x = 0; x < s->w; x += MB_SIZE, ++mbn) { + int *base; + + if(CERTAIN(encoding)) { +// use for the training only the blocks known to be to be encoded [sic:-] + if(s->mb[mbn].best_encoding != encoding) continue; + } + + base = s->codebook_input + i*entry_size; + if(v1mode) { + //subsample + for(j = y2 = 0; y2 < entry_size; y2 += 2) { + for(x2 = 0; x2 < 4; x2 += 2, j++) { + plane = y2 < 4 ? 0 : 1 + (x2 >> 1); + shift = y2 < 4 ? 0 : 1; + x3 = shift ? 0 : x2; + y3 = shift ? 0 : y2; + base[j] = (pict->data[plane][((x+x3) >> shift) + ((y+y3) >> shift) * pict->linesize[plane]] + + pict->data[plane][((x+x3) >> shift) + 1 + ((y+y3) >> shift) * pict->linesize[plane]] + + pict->data[plane][((x+x3) >> shift) + (((y+y3) >> shift) + 1) * pict->linesize[plane]] + + pict->data[plane][((x+x3) >> shift) + 1 + (((y+y3) >> shift) + 1) * pict->linesize[plane]]) >> 2; + } + } + } else { + //copy + for(j = y2 = 0; y2 < MB_SIZE; y2 += 2) { + for(x2 = 0; x2 < MB_SIZE; x2 += 2) { + for(k = 0; k < entry_size; k++, j++) { + plane = k >= 4 ? k - 3 : 0; + + if(k >= 4) { + x3 = (x+x2) >> 1; + y3 = (y+y2) >> 1; + } else { + x3 = x + x2 + (k & 1); + y3 = y + y2 + (k >> 1); + } + + base[j] = pict->data[plane][x3 + y3*pict->linesize[plane]]; + } + } + } + } + i += v1mode ? 1 : 4; + } + } +// if(i < mbn*(v1mode ? 1 : 4)) { +// av_log(s->avctx, AV_LOG_INFO, "reducing training set for %s from %i to %i (encoding %i)\n", v1mode?"v1":"v4", mbn*(v1mode ? 1 : 4), i, encoding); +// } + + if(i == 0) // empty training set, nothing to do + return 0; + if(i < size) { + //av_log(s->avctx, (CERTAIN(encoding) ? AV_LOG_ERROR : AV_LOG_INFO), "WOULD WASTE: %s cbsize %i bigger than training set size %i (encoding %i)\n", v1mode?"v1":"v4", size, i, encoding); + size = i; + } + + avpriv_init_elbg(s->codebook_input, entry_size, i, codebook, size, 1, s->codebook_closest, &s->randctx); + avpriv_do_elbg(s->codebook_input, entry_size, i, codebook, size, 1, s->codebook_closest, &s->randctx); + + //setup vq_pict, which contains a single MB + vq_pict.data[0] = vq_pict_buf; + vq_pict.linesize[0] = MB_SIZE; + vq_pict.data[1] = &vq_pict_buf[MB_AREA]; + vq_pict.data[2] = vq_pict.data[1] + (MB_AREA >> 2); + vq_pict.linesize[1] = vq_pict.linesize[2] = MB_SIZE >> 1; + + //copy indices + for(i = j = y = 0; y < h; y += MB_SIZE) { + for(x = 0; x < s->w; x += MB_SIZE, j++) { + mb_info *mb = &s->mb[j]; +// skip uninteresting blocks if we know their preferred encoding + if(CERTAIN(encoding) && mb->best_encoding != encoding) + continue; + + //point sub_pict to current MB + get_sub_picture(s, x, y, pict, &sub_pict); + + if(v1mode) { + mb->v1_vector = s->codebook_closest[i]; + + //fill in vq_pict with V1 data + decode_v1_vector(s, &vq_pict, mb->v1_vector, info); + + mb->v1_error = compute_mb_distortion(s, &sub_pict, &vq_pict); + total_error += mb->v1_error; + } else { + for(k = 0; k < 4; k++) + mb->v4_vector[k] = s->codebook_closest[i+k]; + + //fill in vq_pict with V4 data + decode_v4_vector(s, &vq_pict, mb->v4_vector, info); + + mb->v4_error = compute_mb_distortion(s, &sub_pict, &vq_pict); + total_error += mb->v4_error; + } + i += v1mode ? 1 : 4; + } + } +// check that we did it right in the beginning of the function + av_assert0(i >= size); // training set is no smaller than the codebook + + //av_log(s->avctx, AV_LOG_INFO, "isv1 %i size= %i i= %i error %"PRId64"\n", v1mode, size, i, total_error); + + return size; +} + +static void calculate_skip_errors(CinepakEncContext *s, int h, AVPicture *last_pict, AVPicture *pict, strip_info *info) +{ + int x, y, i; + AVPicture sub_last, sub_pict; + + for(i = y = 0; y < h; y += MB_SIZE) { + for(x = 0; x < s->w; x += MB_SIZE, i++) { + get_sub_picture(s, x, y, last_pict, &sub_last); + get_sub_picture(s, x, y, pict, &sub_pict); + + s->mb[i].skip_error = compute_mb_distortion(s, &sub_last, &sub_pict); + } + } +} + +static void write_strip_header(CinepakEncContext *s, int y, int h, int keyframe, unsigned char *buf, int strip_size) +{ +// actually we are exclusively using intra strip coding (how much can we win +// otherwise? how to choose which part of a codebook to update?), +// keyframes are different only because we disallow ENC_SKIP on them -- rl +// (besides, the logic here used to be inverted: ) +// buf[0] = keyframe ? 0x11: 0x10; + buf[0] = keyframe ? 0x10: 0x11; + AV_WB24(&buf[1], strip_size + STRIP_HEADER_SIZE); +// AV_WB16(&buf[4], y); /* using absolute y values works -- rl */ + AV_WB16(&buf[4], 0); /* using relative values works as well -- rl */ + AV_WB16(&buf[6], 0); +// AV_WB16(&buf[8], y+h); /* using absolute y values works -- rl */ + AV_WB16(&buf[8], h); /* using relative values works as well -- rl */ + AV_WB16(&buf[10], s->w); + //av_log(s->avctx, AV_LOG_INFO, "write_strip_header() %x keyframe=%d\n", buf[0], keyframe); +} + +static int rd_strip(CinepakEncContext *s, int y, int h, int keyframe, AVPicture *last_pict, AVPicture *pict, AVPicture *scratch_pict, unsigned char *buf, int64_t *best_score +#ifdef CINEPAK_REPORT_SERR +, int64_t *best_serr +#endif +) +{ + int64_t score = 0; +#ifdef CINEPAK_REPORT_SERR + int64_t serr; +#endif + int best_size = 0; + strip_info info; +// for codebook optimization: + int v1enough, v1_size, v4enough, v4_size; + int new_v1_size, new_v4_size; + int v1shrunk, v4shrunk; + + if(!keyframe) + calculate_skip_errors(s, h, last_pict, pict, &info); + + //try some powers of 4 for the size of the codebooks + //constraint the v4 codebook to be no bigger than v1 one, + //(and no less than v1_size/4) + //thus making v1 preferable and possibly losing small details? should be ok +#define SMALLEST_CODEBOOK 1 + for(v1enough = 0, v1_size = SMALLEST_CODEBOOK; v1_size <= CODEBOOK_MAX && !v1enough; v1_size <<= 2) { + for(v4enough = 0, v4_size = 0; v4_size <= v1_size && !v4enough; v4_size = v4_size ? v4_size << 2 : v1_size >= SMALLEST_CODEBOOK << 2 ? v1_size >> 2 : SMALLEST_CODEBOOK) { + //try all modes + for(CinepakMode mode = 0; mode < MODE_COUNT; mode++) { + //don't allow MODE_MC in intra frames + if(keyframe && mode == MODE_MC) + continue; + + if(mode == MODE_V1_ONLY) { + info.v1_size = v1_size; +// the size may shrink even before optimizations if the input is short: + info.v1_size = quantize(s, h, pict, 1, &info, ENC_UNCERTAIN); + if(info.v1_size < v1_size) +// too few eligible blocks, no sense in trying bigger sizes + v1enough = 1; + + info.v4_size = 0; + } else { // mode != MODE_V1_ONLY + // if v4 codebook is empty then only allow V1-only mode + if(!v4_size) + continue; + + if(mode == MODE_V1_V4) { + info.v4_size = v4_size; + info.v4_size = quantize(s, h, pict, 0, &info, ENC_UNCERTAIN); + if(info.v4_size < v4_size) +// too few eligible blocks, no sense in trying bigger sizes + v4enough = 1; + } + } + + info.mode = mode; +// choose the best encoding per block, based on current experience + score = calculate_mode_score(s, h, &info, 0, + &v1shrunk, &v4shrunk +#ifdef CINEPAK_REPORT_SERR +, &serr +#endif +); + + if(mode != MODE_V1_ONLY){ + int extra_iterations_limit = s->max_extra_cb_iterations; +// recompute the codebooks, omitting the extra blocks +// we assume we _may_ come here with more blocks to encode than before + info.v1_size = v1_size; + new_v1_size = quantize(s, h, pict, 1, &info, ENC_V1); + if(new_v1_size < info.v1_size){ + //av_log(s->avctx, AV_LOG_INFO, "mode %i, %3i, %3i: cut v1 codebook to %i entries\n", mode, v1_size, v4_size, new_v1_size); + info.v1_size = new_v1_size; + } +// we assume we _may_ come here with more blocks to encode than before + info.v4_size = v4_size; + new_v4_size = quantize(s, h, pict, 0, &info, ENC_V4); + if(new_v4_size < info.v4_size) { + //av_log(s->avctx, AV_LOG_INFO, "mode %i, %3i, %3i: cut v4 codebook to %i entries at first iteration\n", mode, v1_size, v4_size, new_v4_size); + info.v4_size = new_v4_size; + } +// calculate the resulting score +// (do not move blocks to codebook encodings now, as some blocks may have +// got bigger errors despite a smaller training set - but we do not +// ever grow the training sets back) + for(;;) { + score = calculate_mode_score(s, h, &info, 1, + &v1shrunk, &v4shrunk +#ifdef CINEPAK_REPORT_SERR +, &serr +#endif +); +// do we have a reason to reiterate? if so, have we reached the limit? + if((!v1shrunk && !v4shrunk) || !extra_iterations_limit--) break; +// recompute the codebooks, omitting the extra blocks + if(v1shrunk) { + info.v1_size = v1_size; + new_v1_size = quantize(s, h, pict, 1, &info, ENC_V1); + if(new_v1_size < info.v1_size){ + //av_log(s->avctx, AV_LOG_INFO, "mode %i, %3i, %3i: cut v1 codebook to %i entries\n", mode, v1_size, v4_size, new_v1_size); + info.v1_size = new_v1_size; + } + } + if(v4shrunk) { + info.v4_size = v4_size; + new_v4_size = quantize(s, h, pict, 0, &info, ENC_V4); + if(new_v4_size < info.v4_size) { + //av_log(s->avctx, AV_LOG_INFO, "mode %i, %3i, %3i: cut v4 codebook to %i entries\n", mode, v1_size, v4_size, new_v4_size); + info.v4_size = new_v4_size; + } + } + } + } + + //av_log(s->avctx, AV_LOG_INFO, "%3i %3i score = %"PRId64"\n", v1_size, v4_size, score); + + if(best_size == 0 || score < *best_score) { + + *best_score = score; +#ifdef CINEPAK_REPORT_SERR + *best_serr = serr; +#endif + best_size = encode_mode(s, h, scratch_pict, last_pict, &info, s->strip_buf + STRIP_HEADER_SIZE); + + //av_log(s->avctx, AV_LOG_INFO, "mode %i, %3i, %3i: %18"PRId64" %i B", mode, info.v1_size, info.v4_size, score, best_size); + //av_log(s->avctx, AV_LOG_INFO, "\n"); +#ifdef CINEPAK_REPORT_SERR + av_log(s->avctx, AV_LOG_INFO, "mode %i, %3i, %3i: %18"PRId64" %i B\n", mode, v1_size, v4_size, serr, best_size); +#endif + +#ifdef CINEPAKENC_DEBUG + //save MB encoding choices + memcpy(s->best_mb, s->mb, mb_count*sizeof(mb_info)); +#endif + + //memcpy(strip_temp + STRIP_HEADER_SIZE, strip_temp, best_size); + write_strip_header(s, y, h, keyframe, s->strip_buf, best_size); + + } + } + } + } + +#ifdef CINEPAKENC_DEBUG + //gather stats. this will only work properly of MAX_STRIPS == 1 + if(best_info.mode == MODE_V1_ONLY) { + s->num_v1_mode++; + s->num_v1_encs += s->w*h/MB_AREA; + } else { + if(best_info.mode == MODE_V1_V4) + s->num_v4_mode++; + else + s->num_mc_mode++; + + int x; + for(x = 0; x < s->w*h/MB_AREA; x++) + if(s->best_mb[x].best_encoding == ENC_V1) + s->num_v1_encs++; + else if(s->best_mb[x].best_encoding == ENC_V4) + s->num_v4_encs++; + else + s->num_skips++; + } +#endif + + best_size += STRIP_HEADER_SIZE; + memcpy(buf, s->strip_buf, best_size); + + return best_size; +} + +static int write_cvid_header(CinepakEncContext *s, unsigned char *buf, int num_strips, int data_size, int isakeyframe) +{ + buf[0] = isakeyframe ? 0 : 1; + AV_WB24(&buf[1], data_size + CVID_HEADER_SIZE); + AV_WB16(&buf[4], s->w); + AV_WB16(&buf[6], s->h); + AV_WB16(&buf[8], num_strips); + + return CVID_HEADER_SIZE; +} + +static int rd_frame(CinepakEncContext *s, const AVFrame *frame, int isakeyframe, unsigned char *buf, int buf_size) +{ + int num_strips, strip, i, y, nexty, size, temp_size; + AVPicture last_pict, pict, scratch_pict; + int64_t best_score = 0, score, score_temp; +#ifdef CINEPAK_REPORT_SERR + int64_t best_serr = 0, serr, serr_temp; +#endif + + int best_nstrips = -1, best_size = -1; // mark as uninitialzed + + if(s->pix_fmt == AV_PIX_FMT_RGB24) { + int x; +// build a copy of the given frame in the correct colorspace + for(y = 0; y < s->h; y += 2) { + for(x = 0; x < s->w; x += 2) { + uint8_t *ir[2]; int32_t r, g, b, rr, gg, bb; + ir[0] = ((AVPicture*)frame)->data[0] + x*3 + y*((AVPicture*)frame)->linesize[0]; + ir[1] = ir[0] + ((AVPicture*)frame)->linesize[0]; + get_sub_picture(s, x, y, (AVPicture*)s->input_frame, &scratch_pict); + r = g = b = 0; + for(i=0; i<4; ++i) { + int i1, i2; + i1 = (i&1); i2 = (i>=2); + rr = ir[i2][i1*3+0]; + gg = ir[i2][i1*3+1]; + bb = ir[i2][i1*3+2]; + r += rr; g += gg; b += bb; +// using fixed point arithmetic for portable repeatability, scaling by 2^23 +// "Y" +// rr = 0.2857*rr + 0.5714*gg + 0.1429*bb; + rr = (2396625*rr + 4793251*gg + 1198732*bb) >> 23; + if( rr < 0) rr = 0; + else if (rr > 255) rr = 255; + scratch_pict.data[0][i1 + i2*scratch_pict.linesize[0]] = rr; + } +// let us scale down as late as possible +// r /= 4; g /= 4; b /= 4; +// "U" +// rr = -0.1429*r - 0.2857*g + 0.4286*b; + rr = (-299683*r - 599156*g + 898839*b) >> 23; + if( rr < -128) rr = -128; + else if (rr > 127) rr = 127; + scratch_pict.data[1][0] = rr + 128; // quantize needs unsigned +// "V" +// rr = 0.3571*r - 0.2857*g - 0.0714*b; + rr = (748893*r - 599156*g - 149737*b) >> 23; + if( rr < -128) rr = -128; + else if (rr > 127) rr = 127; + scratch_pict.data[2][0] = rr + 128; // quantize needs unsigned + } + } + } + + //would be nice but quite certainly incompatible with vintage players: + // support encoding zero strips (meaning skip the whole frame) + for(num_strips = s->min_strips; num_strips <= s->max_strips && num_strips <= s->h / MB_SIZE; num_strips++) { + score = 0; + size = 0; +#ifdef CINEPAK_REPORT_SERR + serr = 0; +#endif + + for(y = 0, strip = 1; y < s->h; strip++, y = nexty) { + int strip_height; + + nexty = strip * s->h / num_strips; // <= s->h + //make nexty the next multiple of 4 if not already there + if(nexty & 3) + nexty += 4 - (nexty & 3); + + strip_height = nexty - y; + if(strip_height <= 0) { // can this ever happen? + av_log(s->avctx, AV_LOG_INFO, "skipping zero height strip %i of %i\n", strip, num_strips); + continue; + } + + if(s->pix_fmt == AV_PIX_FMT_RGB24) + get_sub_picture(s, 0, y, (AVPicture*)s->input_frame, &pict); + else + get_sub_picture(s, 0, y, (AVPicture*)frame, &pict); + get_sub_picture(s, 0, y, (AVPicture*)s->last_frame, &last_pict); + get_sub_picture(s, 0, y, (AVPicture*)s->scratch_frame, &scratch_pict); + + if((temp_size = rd_strip(s, y, strip_height, isakeyframe, &last_pict, &pict, &scratch_pict, s->frame_buf + size + CVID_HEADER_SIZE, &score_temp +#ifdef CINEPAK_REPORT_SERR +, &serr_temp +#endif +)) < 0) + return temp_size; + + score += score_temp; +#ifdef CINEPAK_REPORT_SERR + serr += serr_temp; +#endif + size += temp_size; + //av_log(s->avctx, AV_LOG_INFO, "strip %d, isakeyframe=%d", strip, isakeyframe); + //av_log(s->avctx, AV_LOG_INFO, "\n"); + } + + if(best_score == 0 || score < best_score) { + best_score = score; +#ifdef CINEPAK_REPORT_SERR + best_serr = serr; +#endif + best_size = size + write_cvid_header(s, s->frame_buf, num_strips, size, isakeyframe); + //av_log(s->avctx, AV_LOG_INFO, "best number of strips so far: %2i, %12"PRId64", %i B\n", num_strips, score, best_size); +#ifdef CINEPAK_REPORT_SERR + av_log(s->avctx, AV_LOG_INFO, "best number of strips so far: %2i, %12"PRId64", %i B\n", num_strips, serr, best_size); +#endif + + FFSWAP(AVFrame *, s->best_frame, s->scratch_frame); + memcpy(buf, s->frame_buf, best_size); + best_nstrips = num_strips; + } +// avoid trying too many strip numbers without a real reason +// (this makes the processing of the very first frame faster) + if(num_strips - best_nstrips > 4) + break; + } + + av_assert0(best_nstrips >= 0 && best_size >= 0); + +// let the number of strips slowly adapt to the changes in the contents, +// compared to full bruteforcing every time this will occasionally lead +// to some r/d performance loss but makes encoding up to several times faster + if(!s->strip_number_delta_range) { + if(best_nstrips == s->max_strips) { // let us try to step up + s->max_strips = best_nstrips + 1; + if(s->max_strips >= s->max_max_strips) + s->max_strips = s->max_max_strips; + } else { // try to step down + s->max_strips = best_nstrips; + } + s->min_strips = s->max_strips - 1; + if(s->min_strips < s->min_min_strips) + s->min_strips = s->min_min_strips; + } else { + s->max_strips = best_nstrips + s->strip_number_delta_range; + if(s->max_strips >= s->max_max_strips) + s->max_strips = s->max_max_strips; + s->min_strips = best_nstrips - s->strip_number_delta_range; + if(s->min_strips < s->min_min_strips) + s->min_strips = s->min_min_strips; + } + + return best_size; +} + +static int cinepak_encode_frame(AVCodecContext *avctx, AVPacket *pkt, + const AVFrame *frame, int *got_packet) +{ + CinepakEncContext *s = avctx->priv_data; + int ret; + + s->lambda = frame->quality ? frame->quality - 1 : 2 * FF_LAMBDA_SCALE; + + if ((ret = ff_alloc_packet2(avctx, pkt, s->frame_buf_size, 0)) < 0) + return ret; + ret = rd_frame(s, frame, (s->curframe == 0), pkt->data, s->frame_buf_size); + pkt->size = ret; + if (s->curframe == 0) + pkt->flags |= AV_PKT_FLAG_KEY; + *got_packet = 1; + + FFSWAP(AVFrame *, s->last_frame, s->best_frame); + + if (++s->curframe >= s->keyint) + s->curframe = 0; + + return 0; +} + +static av_cold int cinepak_encode_end(AVCodecContext *avctx) +{ + CinepakEncContext *s = avctx->priv_data; + int x; + + av_frame_free(&s->last_frame); + av_frame_free(&s->best_frame); + av_frame_free(&s->scratch_frame); + if (avctx->pix_fmt == AV_PIX_FMT_RGB24) + av_frame_free(&s->input_frame); + av_freep(&s->codebook_input); + av_freep(&s->codebook_closest); + av_freep(&s->strip_buf); + av_freep(&s->frame_buf); + av_freep(&s->mb); +#ifdef CINEPAKENC_DEBUG + av_freep(&s->best_mb); +#endif + + for(x = 0; x < (avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 4 : 3); x++) + av_freep(&s->pict_bufs[x]); + +#ifdef CINEPAKENC_DEBUG + av_log(avctx, AV_LOG_INFO, "strip coding stats: %i V1 mode, %i V4 mode, %i MC mode (%i V1 encs, %i V4 encs, %i skips)\n", + s->num_v1_mode, s->num_v4_mode, s->num_mc_mode, s->num_v1_encs, s->num_v4_encs, s->num_skips); +#endif + + return 0; +} + +AVCodec ff_cinepak_encoder = { + .name = "cinepak", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_CINEPAK, + .priv_data_size = sizeof(CinepakEncContext), + .init = cinepak_encode_init, + .encode2 = cinepak_encode_frame, + .close = cinepak_encode_end, + .pix_fmts = (const enum AVPixelFormat[]){AV_PIX_FMT_RGB24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE}, + .long_name = NULL_IF_CONFIG_SMALL("Cinepak / CVID"), + .priv_class = &cinepak_class, +}; |