160 lines
4.6 KiB
C
Executable file
160 lines
4.6 KiB
C
Executable file
/*
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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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#include "internal.h"
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#include "libavutil/common.h"
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typedef struct ZeroCodecContext {
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AVFrame *previous_frame;
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z_stream zstream;
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} ZeroCodecContext;
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static int zerocodec_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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ZeroCodecContext *zc = avctx->priv_data;
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AVFrame *pic = data;
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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 = prev_pic->data[0];
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uint8_t *dst;
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int i, j, zret, ret;
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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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} else {
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if (!prev) {
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av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
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return AVERROR_INVALIDDATA;
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}
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prev += (avctx->height - 1) * prev_pic->linesize[0];
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pic->key_frame = 0;
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pic->pict_type = AV_PICTURE_TYPE_P;
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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_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, pic, AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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zstream->next_in = avpkt->data;
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zstream->avail_in = avpkt->size;
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dst = pic->data[0] + (avctx->height - 1) * pic->linesize[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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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_INVALIDDATA;
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}
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if (!(avpkt->flags & AV_PKT_FLAG_KEY))
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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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av_frame_unref(zc->previous_frame);
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if ((ret = av_frame_ref(zc->previous_frame, pic)) < 0)
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return ret;
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*got_frame = 1;
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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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av_frame_free(&zc->previous_frame);
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inflateEnd(&zc->zstream);
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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 = AV_PIX_FMT_UYVY422;
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avctx->bits_per_raw_sample = 8;
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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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zc->previous_frame = av_frame_alloc();
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if (!zc->previous_frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static void zerocodec_decode_flush(AVCodecContext *avctx)
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{
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ZeroCodecContext *zc = avctx->priv_data;
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av_frame_unref(zc->previous_frame);
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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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.long_name = NULL_IF_CONFIG_SMALL("ZeroCodec Lossless Video"),
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.id = AV_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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.flush = zerocodec_decode_flush,
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.close = zerocodec_decode_close,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
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FF_CODEC_CAP_INIT_CLEANUP,
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};
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