summaryrefslogtreecommitdiff
path: root/libavcodec/smvjpegdec.c
diff options
context:
space:
mode:
Diffstat (limited to 'libavcodec/smvjpegdec.c')
-rw-r--r--libavcodec/smvjpegdec.c220
1 files changed, 220 insertions, 0 deletions
diff --git a/libavcodec/smvjpegdec.c b/libavcodec/smvjpegdec.c
new file mode 100644
index 0000000000..9c2fb380e1
--- /dev/null
+++ b/libavcodec/smvjpegdec.c
@@ -0,0 +1,220 @@
+/*
+ * SMV JPEG decoder
+ * Copyright (c) 2013 Ash Hughes
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * SMV JPEG decoder.
+ */
+
+// #define DEBUG
+#include "avcodec.h"
+#include "libavutil/opt.h"
+#include "libavutil/imgutils.h"
+#include "mjpegdec.h"
+#include "internal.h"
+
+typedef struct SMVJpegDecodeContext {
+ MJpegDecodeContext jpg;
+ AVFrame *picture[2]; /* pictures array */
+ AVCodecContext* avctx;
+ int frames_per_jpeg;
+ int mjpeg_data_size;
+} SMVJpegDecodeContext;
+
+static inline void smv_img_pnt_plane(uint8_t **dst, uint8_t *src,
+ int src_linesize, int height, int nlines)
+{
+ if (!dst || !src)
+ return;
+ src += (nlines) * src_linesize * height;
+ *dst = src;
+}
+
+static inline void smv_img_pnt(uint8_t *dst_data[4], uint8_t *src_data[4],
+ const int src_linesizes[4],
+ enum AVPixelFormat pix_fmt, int width, int height,
+ int nlines)
+{
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
+ int i, planes_nb = 0;
+
+ if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
+ return;
+
+ for (i = 0; i < desc->nb_components; i++)
+ planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
+
+ for (i = 0; i < planes_nb; i++) {
+ int h = height;
+ if (i == 1 || i == 2) {
+ h = FF_CEIL_RSHIFT(height, desc->log2_chroma_h);
+ }
+ smv_img_pnt_plane(&dst_data[i], src_data[i],
+ src_linesizes[i], h, nlines);
+ }
+ if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
+ desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
+ dst_data[1] = src_data[1];
+}
+
+static av_cold int smvjpeg_decode_end(AVCodecContext *avctx)
+{
+ SMVJpegDecodeContext *s = avctx->priv_data;
+ MJpegDecodeContext *jpg = &s->jpg;
+ int ret;
+
+ jpg->picture_ptr = NULL;
+ av_frame_free(&s->picture[0]);
+ av_frame_free(&s->picture[1]);
+ ret = avcodec_close(s->avctx);
+ av_freep(&s->avctx);
+ return ret;
+}
+
+static av_cold int smvjpeg_decode_init(AVCodecContext *avctx)
+{
+ SMVJpegDecodeContext *s = avctx->priv_data;
+ AVCodec *codec;
+ AVDictionary *thread_opt = NULL;
+ int ret = 0, r;
+
+ s->frames_per_jpeg = 0;
+
+ s->picture[0] = av_frame_alloc();
+ if (!s->picture[0])
+ return AVERROR(ENOMEM);
+
+ s->picture[1] = av_frame_alloc();
+ if (!s->picture[1]) {
+ av_frame_free(&s->picture[0]);
+ return AVERROR(ENOMEM);
+ }
+
+ s->jpg.picture_ptr = s->picture[0];
+
+ if (avctx->extradata_size >= 4)
+ s->frames_per_jpeg = AV_RL32(avctx->extradata);
+
+ if (s->frames_per_jpeg <= 0) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid number of frames per jpeg.\n");
+ ret = AVERROR_INVALIDDATA;
+ }
+
+ codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
+ if (!codec) {
+ av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
+ smvjpeg_decode_end(avctx);
+ return AVERROR_DECODER_NOT_FOUND;
+ }
+
+ s->avctx = avcodec_alloc_context3(codec);
+
+ av_dict_set(&thread_opt, "threads", "1", 0);
+ s->avctx->refcounted_frames = 1;
+ s->avctx->flags = avctx->flags;
+ s->avctx->idct_algo = avctx->idct_algo;
+ if ((r = ff_codec_open2_recursive(s->avctx, codec, &thread_opt)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
+ ret = r;
+ }
+ av_dict_free(&thread_opt);
+
+ if (ret < 0)
+ smvjpeg_decode_end(avctx);
+ return ret;
+}
+
+static int smvjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
+ AVPacket *avpkt)
+{
+ const AVPixFmtDescriptor *desc;
+ SMVJpegDecodeContext *s = avctx->priv_data;
+ AVFrame* mjpeg_data = s->picture[0];
+ int i, cur_frame = 0, ret = 0;
+
+ cur_frame = avpkt->pts % s->frames_per_jpeg;
+
+ /* Are we at the start of a block? */
+ if (!cur_frame) {
+ av_frame_unref(mjpeg_data);
+ ret = avcodec_decode_video2(s->avctx, mjpeg_data, &s->mjpeg_data_size, avpkt);
+ if (ret < 0) {
+ s->mjpeg_data_size = 0;
+ return ret;
+ }
+ } else if (!s->mjpeg_data_size)
+ return AVERROR(EINVAL);
+
+ desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
+ av_assert0(desc);
+
+ if (mjpeg_data->height % (s->frames_per_jpeg << desc->log2_chroma_h)) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid height\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /*use the last lot... */
+ *data_size = s->mjpeg_data_size;
+
+ avctx->pix_fmt = s->avctx->pix_fmt;
+
+ /* We shouldn't get here if frames_per_jpeg <= 0 because this was rejected
+ in init */
+ ret = ff_set_dimensions(avctx, mjpeg_data->width, mjpeg_data->height / s->frames_per_jpeg);
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Failed to set dimensions\n");
+ return ret;
+ }
+
+ if (*data_size) {
+ s->picture[1]->extended_data = NULL;
+ s->picture[1]->width = avctx->width;
+ s->picture[1]->height = avctx->height;
+ s->picture[1]->format = avctx->pix_fmt;
+ /* ff_init_buffer_info(avctx, &s->picture[1]); */
+ smv_img_pnt(s->picture[1]->data, mjpeg_data->data, mjpeg_data->linesize,
+ avctx->pix_fmt, avctx->width, avctx->height, cur_frame);
+ for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
+ s->picture[1]->linesize[i] = mjpeg_data->linesize[i];
+
+ ret = av_frame_ref(data, s->picture[1]);
+ }
+
+ return ret;
+}
+
+static const AVClass smvjpegdec_class = {
+ .class_name = "SMVJPEG decoder",
+ .item_name = av_default_item_name,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVCodec ff_smvjpeg_decoder = {
+ .name = "smvjpeg",
+ .long_name = NULL_IF_CONFIG_SMALL("SMV JPEG"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_SMVJPEG,
+ .priv_data_size = sizeof(SMVJpegDecodeContext),
+ .init = smvjpeg_decode_init,
+ .close = smvjpeg_decode_end,
+ .decode = smvjpeg_decode_frame,
+ .priv_class = &smvjpegdec_class,
+};
View Lorry Controller Status