mirror of
https://git.ffmpeg.org/ffmpeg.git
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141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* PDV video format
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*
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* Copyright (c) 2023 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "decode.h"
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#include "zlib_wrapper.h"
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#include <zlib.h>
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typedef struct PDVContext {
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AVFrame *previous_frame;
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FFZStream zstream;
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} PDVContext;
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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PDVContext *s = avctx->priv_data;
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avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
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s->previous_frame = av_frame_alloc();
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if (!s->previous_frame)
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return AVERROR(ENOMEM);
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return ff_inflate_init(&s->zstream, avctx);
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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PDVContext *s = avctx->priv_data;
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av_frame_free(&s->previous_frame);
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ff_inflate_end(&s->zstream);
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *avpkt)
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{
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PDVContext *s = avctx->priv_data;
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AVFrame *prev_frame = s->previous_frame;
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z_stream *const zstream = &s->zstream.zstream;
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uint8_t *dst, *prev = prev_frame->data[0];
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int ret, zret;
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if (avctx->skip_frame >= AVDISCARD_ALL ||
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(avctx->skip_frame >= AVDISCARD_NONINTRA &&
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!(avpkt->flags & AV_PKT_FLAG_KEY)))
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return avpkt->size;
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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, frame, 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 = frame->data[0];
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for (int i = 0; i < avctx->height; i++) {
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zstream->next_out = dst;
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zstream->avail_out = (avctx->width + 7) >> 3;
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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 (prev && !(avpkt->flags & AV_PKT_FLAG_KEY)) {
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for (int j = 0; j < (avctx->width + 7) >> 3; j++)
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dst[j] ^= prev[j];
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prev += prev_frame->linesize[0];
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}
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dst += frame->linesize[0];
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}
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if ((ret = av_frame_replace(s->previous_frame, frame)) < 0)
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return ret;
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if (avpkt->flags & AV_PKT_FLAG_KEY) {
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frame->flags |= AV_FRAME_FLAG_KEY;
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frame->pict_type = AV_PICTURE_TYPE_I;
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} else {
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frame->pict_type = AV_PICTURE_TYPE_P;
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}
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*got_frame = 1;
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return avpkt->size;
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}
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static void decode_flush(AVCodecContext *avctx)
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{
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PDVContext *s = avctx->priv_data;
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av_frame_unref(s->previous_frame);
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}
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const FFCodec ff_pdv_decoder = {
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.p.name = "pdv",
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CODEC_LONG_NAME("PDV (PlayDate Video)"),
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.priv_data_size = sizeof(PDVContext),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_PDV,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
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FF_CODEC_CAP_INIT_CLEANUP,
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.init = decode_init,
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.close = decode_end,
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.flush = decode_flush,
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FF_CODEC_DECODE_CB(decode_frame),
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};
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