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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
161 lines
4.6 KiB
C
161 lines
4.6 KiB
C
/*
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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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const 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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