| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * PDV video format | ||
| 3 | * | ||
| 4 | * Copyright (c) 2023 Paul B Mahol | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include "avcodec.h" | ||
| 24 | #include "codec_internal.h" | ||
| 25 | #include "decode.h" | ||
| 26 | #include "zlib_wrapper.h" | ||
| 27 | |||
| 28 | #include <zlib.h> | ||
| 29 | |||
| 30 | typedef struct PDVContext { | ||
| 31 | AVFrame *previous_frame; | ||
| 32 | FFZStream zstream; | ||
| 33 | } PDVContext; | ||
| 34 | |||
| 35 | ✗ | static av_cold int decode_init(AVCodecContext *avctx) | |
| 36 | { | ||
| 37 | ✗ | PDVContext *s = avctx->priv_data; | |
| 38 | |||
| 39 | ✗ | avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; | |
| 40 | |||
| 41 | ✗ | s->previous_frame = av_frame_alloc(); | |
| 42 | ✗ | if (!s->previous_frame) | |
| 43 | ✗ | return AVERROR(ENOMEM); | |
| 44 | |||
| 45 | ✗ | return ff_inflate_init(&s->zstream, avctx); | |
| 46 | } | ||
| 47 | |||
| 48 | ✗ | static av_cold int decode_end(AVCodecContext *avctx) | |
| 49 | { | ||
| 50 | ✗ | PDVContext *s = avctx->priv_data; | |
| 51 | |||
| 52 | ✗ | av_frame_free(&s->previous_frame); | |
| 53 | ✗ | ff_inflate_end(&s->zstream); | |
| 54 | |||
| 55 | ✗ | return 0; | |
| 56 | } | ||
| 57 | |||
| 58 | ✗ | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 59 | int *got_frame, AVPacket *avpkt) | ||
| 60 | { | ||
| 61 | ✗ | PDVContext *s = avctx->priv_data; | |
| 62 | ✗ | AVFrame *prev_frame = s->previous_frame; | |
| 63 | ✗ | z_stream *const zstream = &s->zstream.zstream; | |
| 64 | ✗ | uint8_t *dst, *prev = prev_frame->data[0]; | |
| 65 | int ret, zret; | ||
| 66 | |||
| 67 | ✗ | if (avctx->skip_frame >= AVDISCARD_ALL || | |
| 68 | ✗ | (avctx->skip_frame >= AVDISCARD_NONINTRA && | |
| 69 | ✗ | !(avpkt->flags & AV_PKT_FLAG_KEY))) | |
| 70 | ✗ | return avpkt->size; | |
| 71 | |||
| 72 | ✗ | zret = inflateReset(zstream); | |
| 73 | ✗ | if (zret != Z_OK) { | |
| 74 | ✗ | av_log(avctx, AV_LOG_ERROR, "Could not reset inflate: %d.\n", zret); | |
| 75 | ✗ | return AVERROR_INVALIDDATA; | |
| 76 | } | ||
| 77 | |||
| 78 | ✗ | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) | |
| 79 | ✗ | return ret; | |
| 80 | |||
| 81 | ✗ | zstream->next_in = avpkt->data; | |
| 82 | ✗ | zstream->avail_in = avpkt->size; | |
| 83 | |||
| 84 | ✗ | dst = frame->data[0]; | |
| 85 | ✗ | for (int i = 0; i < avctx->height; i++) { | |
| 86 | ✗ | zstream->next_out = dst; | |
| 87 | ✗ | zstream->avail_out = (avctx->width + 7) >> 3; | |
| 88 | |||
| 89 | ✗ | zret = inflate(zstream, Z_SYNC_FLUSH); | |
| 90 | ✗ | if (zret != Z_OK && zret != Z_STREAM_END) { | |
| 91 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
| 92 | "Inflate failed with return code: %d.\n", zret); | ||
| 93 | ✗ | return AVERROR_INVALIDDATA; | |
| 94 | } | ||
| 95 | |||
| 96 | ✗ | if (prev && !(avpkt->flags & AV_PKT_FLAG_KEY)) { | |
| 97 | ✗ | for (int j = 0; j < (avctx->width + 7) >> 3; j++) | |
| 98 | ✗ | dst[j] ^= prev[j]; | |
| 99 | ✗ | prev += prev_frame->linesize[0]; | |
| 100 | } | ||
| 101 | |||
| 102 | ✗ | dst += frame->linesize[0]; | |
| 103 | } | ||
| 104 | |||
| 105 | ✗ | if ((ret = av_frame_replace(s->previous_frame, frame)) < 0) | |
| 106 | ✗ | return ret; | |
| 107 | |||
| 108 | ✗ | if (avpkt->flags & AV_PKT_FLAG_KEY) { | |
| 109 | ✗ | frame->flags |= AV_FRAME_FLAG_KEY; | |
| 110 | ✗ | frame->pict_type = AV_PICTURE_TYPE_I; | |
| 111 | } else { | ||
| 112 | ✗ | frame->pict_type = AV_PICTURE_TYPE_P; | |
| 113 | } | ||
| 114 | |||
| 115 | ✗ | *got_frame = 1; | |
| 116 | |||
| 117 | ✗ | return avpkt->size; | |
| 118 | } | ||
| 119 | |||
| 120 | ✗ | static void decode_flush(AVCodecContext *avctx) | |
| 121 | { | ||
| 122 | ✗ | PDVContext *s = avctx->priv_data; | |
| 123 | |||
| 124 | ✗ | av_frame_unref(s->previous_frame); | |
| 125 | ✗ | } | |
| 126 | |||
| 127 | const FFCodec ff_pdv_decoder = { | ||
| 128 | .p.name = "pdv", | ||
| 129 | CODEC_LONG_NAME("PDV (PlayDate Video)"), | ||
| 130 | .priv_data_size = sizeof(PDVContext), | ||
| 131 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 132 | .p.id = AV_CODEC_ID_PDV, | ||
| 133 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 134 | .caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | | ||
| 135 | FF_CODEC_CAP_INIT_CLEANUP, | ||
| 136 | .init = decode_init, | ||
| 137 | .close = decode_end, | ||
| 138 | .flush = decode_flush, | ||
| 139 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 140 | }; | ||
| 141 |