mirror of https://github.com/FFmpeg/FFmpeg.git
It shares very little code with pngdec, so keeping them together only makes the code harder to read.pull/371/head
Anton Khirnov
4 years ago
parent
6853bdbdd2
commit
3a5b857d4c
4 changed files with 291 additions and 169 deletions
@ -0,0 +1,279 @@ |
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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 <stdint.h> |
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#include <zlib.h> |
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#include "libavutil/frame.h" |
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#include "libavutil/error.h" |
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#include "libavutil/log.h" |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "codec.h" |
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#include "internal.h" |
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#include "packet.h" |
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#include "png.h" |
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#include "pngdsp.h" |
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typedef struct LSCRContext { |
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PNGDSPContext dsp; |
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AVCodecContext *avctx; |
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AVFrame *last_picture; |
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uint8_t *buffer; |
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int buffer_size; |
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uint8_t *crow_buf; |
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int crow_size; |
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uint8_t *last_row; |
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unsigned int last_row_size; |
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GetByteContext gb; |
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uint8_t *image_buf; |
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int image_linesize; |
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int row_size; |
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int cur_h; |
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int y; |
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z_stream zstream; |
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} LSCRContext; |
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static void handle_row(LSCRContext *s) |
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{ |
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uint8_t *ptr, *last_row; |
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ptr = s->image_buf + s->image_linesize * s->y; |
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if (s->y == 0) |
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last_row = s->last_row; |
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else |
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last_row = ptr - s->image_linesize; |
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ff_png_filter_row(&s->dsp, ptr, s->crow_buf[0], s->crow_buf + 1, |
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last_row, s->row_size, 3); |
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s->y++; |
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} |
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static int decode_idat(LSCRContext *s, int length) |
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{ |
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int ret; |
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s->zstream.avail_in = FFMIN(length, bytestream2_get_bytes_left(&s->gb)); |
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s->zstream.next_in = s->gb.buffer; |
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bytestream2_skip(&s->gb, length); |
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/* decode one line if possible */ |
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while (s->zstream.avail_in > 0) { |
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ret = inflate(&s->zstream, Z_PARTIAL_FLUSH); |
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if (ret != Z_OK && ret != Z_STREAM_END) { |
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av_log(s->avctx, AV_LOG_ERROR, "inflate returned error %d\n", ret); |
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return AVERROR_EXTERNAL; |
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} |
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if (s->zstream.avail_out == 0) { |
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if (s->y < s->cur_h) { |
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handle_row(s); |
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} |
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s->zstream.avail_out = s->crow_size; |
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s->zstream.next_out = s->crow_buf; |
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} |
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if (ret == Z_STREAM_END && s->zstream.avail_in > 0) { |
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av_log(s->avctx, AV_LOG_WARNING, |
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"%d undecompressed bytes left in buffer\n", s->zstream.avail_in); |
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return 0; |
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} |
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} |
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return 0; |
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} |
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static int decode_frame_lscr(AVCodecContext *avctx, |
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void *data, int *got_frame, |
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AVPacket *avpkt) |
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{ |
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LSCRContext *const s = avctx->priv_data; |
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GetByteContext *gb = &s->gb; |
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AVFrame *frame = data; |
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int ret, nb_blocks, offset = 0; |
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if (avpkt->size < 2) |
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return AVERROR_INVALIDDATA; |
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if (avpkt->size == 2) |
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return 0; |
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bytestream2_init(gb, avpkt->data, avpkt->size); |
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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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nb_blocks = bytestream2_get_le16(gb); |
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if (bytestream2_get_bytes_left(gb) < 2 + nb_blocks * (12 + 8)) |
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return AVERROR_INVALIDDATA; |
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if (s->last_picture->data[0]) { |
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ret = av_frame_copy(frame, s->last_picture); |
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if (ret < 0) |
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return ret; |
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} |
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for (int b = 0; b < nb_blocks; b++) { |
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int x, y, x2, y2, w, h, left; |
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uint32_t csize, size; |
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s->zstream.zalloc = ff_png_zalloc; |
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s->zstream.zfree = ff_png_zfree; |
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s->zstream.opaque = NULL; |
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if ((ret = inflateInit(&s->zstream)) != Z_OK) { |
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av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret); |
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ret = AVERROR_EXTERNAL; |
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goto end; |
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} |
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bytestream2_seek(gb, 2 + b * 12, SEEK_SET); |
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x = bytestream2_get_le16(gb); |
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y = bytestream2_get_le16(gb); |
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x2 = bytestream2_get_le16(gb); |
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y2 = bytestream2_get_le16(gb); |
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w = x2-x; |
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s->cur_h = h = y2-y; |
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if (w <= 0 || x < 0 || x >= avctx->width || w + x > avctx->width || |
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h <= 0 || y < 0 || y >= avctx->height || h + y > avctx->height) { |
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ret = AVERROR_INVALIDDATA; |
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goto end; |
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} |
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size = bytestream2_get_le32(gb); |
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frame->key_frame = (nb_blocks == 1) && |
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(w == avctx->width) && |
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(h == avctx->height) && |
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(x == 0) && (y == 0); |
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bytestream2_seek(gb, 2 + nb_blocks * 12 + offset, SEEK_SET); |
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csize = bytestream2_get_be32(gb); |
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if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) { |
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ret = AVERROR_INVALIDDATA; |
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goto end; |
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} |
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offset += size; |
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left = size; |
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s->y = 0; |
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s->row_size = w * 3; |
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av_fast_padded_malloc(&s->buffer, &s->buffer_size, s->row_size + 16); |
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if (!s->buffer) { |
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ret = AVERROR(ENOMEM); |
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goto end; |
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} |
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av_fast_padded_malloc(&s->last_row, &s->last_row_size, s->row_size); |
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if (!s->last_row) { |
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ret = AVERROR(ENOMEM); |
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goto end; |
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} |
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s->crow_size = w * 3 + 1; |
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s->crow_buf = s->buffer + 15; |
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s->zstream.avail_out = s->crow_size; |
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s->zstream.next_out = s->crow_buf; |
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s->image_buf = frame->data[0] + (avctx->height - y - 1) * frame->linesize[0] + x * 3; |
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s->image_linesize =-frame->linesize[0]; |
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while (left > 16) { |
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ret = decode_idat(s, csize); |
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if (ret < 0) |
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goto end; |
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left -= csize + 16; |
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if (left > 16) { |
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bytestream2_skip(gb, 4); |
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csize = bytestream2_get_be32(gb); |
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if (bytestream2_get_le32(gb) != MKTAG('I', 'D', 'A', 'T')) { |
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ret = AVERROR_INVALIDDATA; |
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goto end; |
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} |
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} |
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} |
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inflateEnd(&s->zstream); |
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} |
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frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
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av_frame_unref(s->last_picture); |
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if ((ret = av_frame_ref(s->last_picture, frame)) < 0) |
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return ret; |
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*got_frame = 1; |
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end: |
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inflateEnd(&s->zstream); |
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if (ret < 0) |
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return ret; |
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return avpkt->size; |
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} |
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static int lscr_decode_close(AVCodecContext *avctx) |
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{ |
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LSCRContext *s = avctx->priv_data; |
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av_frame_free(&s->last_picture); |
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av_freep(&s->buffer); |
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av_freep(&s->last_row); |
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return 0; |
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} |
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static int lscr_decode_init(AVCodecContext *avctx) |
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{ |
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LSCRContext *s = avctx->priv_data; |
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avctx->color_range = AVCOL_RANGE_JPEG; |
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avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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s->avctx = avctx; |
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s->last_picture = av_frame_alloc(); |
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if (!s->last_picture) |
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return AVERROR(ENOMEM); |
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ff_pngdsp_init(&s->dsp); |
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return 0; |
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} |
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static void lscr_decode_flush(AVCodecContext *avctx) |
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{ |
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LSCRContext *s = avctx->priv_data; |
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av_frame_unref(s->last_picture); |
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} |
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AVCodec ff_lscr_decoder = { |
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.name = "lscr", |
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.long_name = NULL_IF_CONFIG_SMALL("LEAD Screen Capture"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_LSCR, |
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.priv_data_size = sizeof(LSCRContext), |
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.init = lscr_decode_init, |
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.close = lscr_decode_close, |
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.decode = decode_frame_lscr, |
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.flush = lscr_decode_flush, |
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.capabilities = AV_CODEC_CAP_DR1, |
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.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_THREADSAFE | |
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FF_CODEC_CAP_ALLOCATE_PROGRESS, |
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}; |
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