mirror of https://github.com/FFmpeg/FFmpeg.git
An obscure Japanese lossless video codec, originally intended for use with a remote desktop application. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com> Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>pull/3/merge
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/*
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* ZeroCodec Decoder |
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* |
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* Copyright (c) 2012, Derek Buitenhuis |
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* |
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* Permission to use, copy, modify, and/or distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <zlib.h> |
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#include "avcodec.h" |
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typedef struct { |
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AVFrame previous_frame; |
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z_stream zstream; |
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int size; |
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} ZeroCodecContext; |
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static int zerocodec_decode_frame(AVCodecContext *avctx, void *data, |
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int *data_size, AVPacket *avpkt) |
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{ |
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ZeroCodecContext *zc = avctx->priv_data; |
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AVFrame *pic = avctx->coded_frame; |
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AVFrame *prev_pic = &zc->previous_frame; |
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z_stream *zstream = &zc->zstream; |
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uint8_t *prev, *dst; |
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int i, j, zret; |
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pic->reference = 3; |
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if (avctx->get_buffer(avctx, pic) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); |
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return AVERROR(ENOMEM); |
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} |
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zret = inflateReset(zstream); |
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if (zret != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d\n", zret); |
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return AVERROR(EINVAL); |
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} |
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zstream->next_in = avpkt->data; |
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zstream->avail_in = avpkt->size; |
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prev = prev_pic->data[0]; |
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dst = pic->data[0]; |
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/**
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* ZeroCodec has very simple interframe compression. If a value |
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* is the same as the previous frame, set it to 0. |
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*/ |
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if (avpkt->flags & AV_PKT_FLAG_KEY) { |
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pic->key_frame = 1; |
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pic->pict_type = AV_PICTURE_TYPE_I; |
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for (i = 0; i < avctx->height; i++) { |
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zstream->next_out = dst; |
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zstream->avail_out = avctx->width << 1; |
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zret = inflate(zstream, Z_SYNC_FLUSH); |
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if (zret != Z_OK && zret != Z_STREAM_END) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Inflate failed with return code: %d\n", zret); |
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return AVERROR(EINVAL); |
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} |
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dst += pic->linesize[0]; |
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} |
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} else { |
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pic->key_frame = 0; |
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pic->pict_type = AV_PICTURE_TYPE_P; |
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for (i = 0; i < avctx->height; i++) { |
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zstream->next_out = dst; |
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zstream->avail_out = avctx->width << 1; |
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zret = inflate(zstream, Z_SYNC_FLUSH); |
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if (zret != Z_OK && zret != Z_STREAM_END) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Inflate failed with return code: %d\n", zret); |
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return AVERROR(EINVAL); |
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} |
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for (j = 0; j < avctx->width << 1; j++) |
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dst[j] += prev[j] & -!dst[j]; |
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prev += prev_pic->linesize[0]; |
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dst += pic->linesize[0]; |
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} |
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} |
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/* Release the previous buffer if need be */ |
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if (prev_pic->data[0]) |
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avctx->release_buffer(avctx, prev_pic); |
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/* Store the previouse frame for use later */ |
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*prev_pic = *pic; |
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*data_size = sizeof(AVFrame); |
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*(AVFrame *)data = *pic; |
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return avpkt->size; |
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} |
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static av_cold int zerocodec_decode_close(AVCodecContext *avctx) |
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{ |
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ZeroCodecContext *zc = avctx->priv_data; |
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AVFrame *prev_pic = &zc->previous_frame; |
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inflateEnd(&zc->zstream); |
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/* Release last frame */ |
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if (prev_pic->data[0]) |
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avctx->release_buffer(avctx, prev_pic); |
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av_freep(&avctx->coded_frame); |
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return 0; |
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} |
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static av_cold int zerocodec_decode_init(AVCodecContext *avctx) |
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{ |
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ZeroCodecContext *zc = avctx->priv_data; |
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z_stream *zstream = &zc->zstream; |
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int zret; |
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avctx->pix_fmt = PIX_FMT_UYVY422; |
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avctx->bits_per_raw_sample = 8; |
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zc->size = avpicture_get_size(avctx->pix_fmt, |
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avctx->width, avctx->height); |
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zstream->zalloc = Z_NULL; |
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zstream->zfree = Z_NULL; |
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zstream->opaque = Z_NULL; |
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zret = inflateInit(zstream); |
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if (zret != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "Could not initialize inflate: %d\n", zret); |
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return AVERROR(ENOMEM); |
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} |
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avctx->coded_frame = avcodec_alloc_frame(); |
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if (!avctx->coded_frame) { |
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av_log(avctx, AV_LOG_ERROR, "Could not allocate frame buffer.\n"); |
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zerocodec_decode_close(avctx); |
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return AVERROR(ENOMEM); |
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} |
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return 0; |
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} |
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AVCodec ff_zerocodec_decoder = { |
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.type = AVMEDIA_TYPE_VIDEO, |
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.name = "zerocodec", |
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.id = CODEC_ID_ZEROCODEC, |
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.priv_data_size = sizeof(ZeroCodecContext), |
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.init = zerocodec_decode_init, |
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.decode = zerocodec_decode_frame, |
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.close = zerocodec_decode_close, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"), |
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}; |
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