mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 16:55:05 +02:00
206 lines
6.2 KiB
C
206 lines
6.2 KiB
C
/*
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* SMV JPEG decoder
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* Copyright (c) 2013 Ash Hughes
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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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/**
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* @file
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* SMV JPEG decoder.
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*/
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// #define DEBUG
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#include "avcodec.h"
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "mjpegdec.h"
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#include "internal.h"
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typedef struct SMVJpegDecodeContext {
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MJpegDecodeContext jpg;
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AVFrame *picture[2]; /* pictures array */
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AVCodecContext* avctx;
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int frames_per_jpeg;
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int mjpeg_data_size;
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} SMVJpegDecodeContext;
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static inline void smv_img_pnt_plane(uint8_t **dst, uint8_t *src,
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int src_linesize, int height, int nlines)
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{
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if (!dst || !src)
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return;
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src += (nlines) * src_linesize * height;
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*dst = src;
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}
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static inline void smv_img_pnt(uint8_t *dst_data[4], uint8_t *src_data[4],
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const int src_linesizes[4],
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enum PixelFormat pix_fmt, int width, int height,
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int nlines)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
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int i, planes_nb = 0;
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if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
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return;
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for (i = 0; i < desc->nb_components; i++)
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planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
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for (i = 0; i < planes_nb; i++) {
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int h = height;
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if (i == 1 || i == 2) {
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h = FF_CEIL_RSHIFT(height, desc->log2_chroma_h);
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}
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smv_img_pnt_plane(&dst_data[i], src_data[i],
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src_linesizes[i], h, nlines);
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}
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if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
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desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
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dst_data[1] = src_data[1];
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}
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static av_cold int smvjpeg_decode_init(AVCodecContext *avctx)
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{
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SMVJpegDecodeContext *s = avctx->priv_data;
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AVCodec *codec;
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AVDictionary *thread_opt = NULL;
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int ret = 0;
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s->frames_per_jpeg = 0;
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s->picture[0] = av_frame_alloc();
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if (!s->picture[0])
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return AVERROR(ENOMEM);
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s->picture[1] = av_frame_alloc();
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if (!s->picture[1])
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return AVERROR(ENOMEM);
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s->jpg.picture_ptr = s->picture[0];
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if (avctx->extradata_size >= 4)
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s->frames_per_jpeg = AV_RL32(avctx->extradata);
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if (s->frames_per_jpeg <= 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid number of frames per jpeg.\n");
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ret = -1;
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}
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codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
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if (!codec) {
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av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
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ret = -1;
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}
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s->avctx = avcodec_alloc_context3(codec);
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av_dict_set(&thread_opt, "threads", "1", 0);
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s->avctx->refcounted_frames = 1;
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s->avctx->flags = avctx->flags;
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s->avctx->idct_algo = avctx->idct_algo;
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if (ff_codec_open2_recursive(s->avctx, codec, &thread_opt) < 0) {
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av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
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ret = -1;
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}
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av_dict_free(&thread_opt);
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return ret;
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}
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static int smvjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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AVPacket *avpkt)
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{
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const AVPixFmtDescriptor *desc;
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SMVJpegDecodeContext *s = avctx->priv_data;
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AVFrame* mjpeg_data = s->picture[0];
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int i, cur_frame = 0, ret = 0;
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cur_frame = avpkt->pts % s->frames_per_jpeg;
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/* Are we at the start of a block? */
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if (!cur_frame) {
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av_frame_unref(mjpeg_data);
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ret = avcodec_decode_video2(s->avctx, mjpeg_data, &s->mjpeg_data_size, avpkt);
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} else if (!s->mjpeg_data_size)
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return AVERROR(EINVAL);
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desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
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if (desc && mjpeg_data->height % (s->frames_per_jpeg << desc->log2_chroma_h)) {
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av_log(avctx, AV_LOG_ERROR, "Invalid height\n");
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return AVERROR_INVALIDDATA;
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}
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/*use the last lot... */
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*data_size = s->mjpeg_data_size;
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avctx->pix_fmt = s->avctx->pix_fmt;
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/* We shouldn't get here if frames_per_jpeg <= 0 because this was rejected
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in init */
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avcodec_set_dimensions(avctx, mjpeg_data->width,
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mjpeg_data->height / s->frames_per_jpeg);
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if (*data_size) {
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s->picture[1]->extended_data = NULL;
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s->picture[1]->width = avctx->width;
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s->picture[1]->height = avctx->height;
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s->picture[1]->format = avctx->pix_fmt;
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/* ff_init_buffer_info(avctx, &s->picture[1]); */
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smv_img_pnt(s->picture[1]->data, mjpeg_data->data, mjpeg_data->linesize,
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avctx->pix_fmt, avctx->width, avctx->height, cur_frame);
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for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
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s->picture[1]->linesize[i] = mjpeg_data->linesize[i];
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ret = av_frame_ref(data, s->picture[1]);
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}
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return ret;
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}
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static av_cold int smvjpeg_decode_end(AVCodecContext *avctx)
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{
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SMVJpegDecodeContext *s = avctx->priv_data;
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MJpegDecodeContext *jpg = &s->jpg;
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jpg->picture_ptr = NULL;
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av_frame_free(&s->picture[0]);
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av_frame_free(&s->picture[1]);
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ff_codec_close_recursive(s->avctx);
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av_freep(&s->avctx);
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return 0;
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}
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static const AVClass smvjpegdec_class = {
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.class_name = "SMVJPEG decoder",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_smvjpeg_decoder = {
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.name = "smvjpeg",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SMVJPEG,
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.priv_data_size = sizeof(SMVJpegDecodeContext),
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.init = smvjpeg_decode_init,
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.close = smvjpeg_decode_end,
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.decode = smvjpeg_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("SMV JPEG"),
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.priv_class = &smvjpegdec_class,
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};
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