3 * Copyright (c) 2013 Ash Hughes
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 #include "libavutil/opt.h"
30 #include "libavutil/imgutils.h"
34 typedef struct SMVJpegDecodeContext {
35 MJpegDecodeContext jpg;
36 AVFrame *picture[2]; /* pictures array */
37 AVCodecContext* avctx;
40 } SMVJpegDecodeContext;
42 static inline void smv_img_pnt_plane(uint8_t **dst, uint8_t *src,
43 int src_linesize, int height, int nlines)
47 src += (nlines) * src_linesize * height;
51 static inline void smv_img_pnt(uint8_t *dst_data[4], uint8_t *src_data[4],
52 const int src_linesizes[4],
53 enum AVPixelFormat pix_fmt, int width, int height,
56 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
59 if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
62 for (i = 0; i < desc->nb_components; i++)
63 planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1);
65 for (i = 0; i < planes_nb; i++) {
67 if (i == 1 || i == 2) {
68 h = AV_CEIL_RSHIFT(height, desc->log2_chroma_h);
70 smv_img_pnt_plane(&dst_data[i], src_data[i],
71 src_linesizes[i], h, nlines);
73 if (desc->flags & AV_PIX_FMT_FLAG_PAL ||
74 desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL)
75 dst_data[1] = src_data[1];
78 static av_cold int smvjpeg_decode_end(AVCodecContext *avctx)
80 SMVJpegDecodeContext *s = avctx->priv_data;
81 MJpegDecodeContext *jpg = &s->jpg;
84 jpg->picture_ptr = NULL;
85 av_frame_free(&s->picture[0]);
86 av_frame_free(&s->picture[1]);
87 ret = avcodec_close(s->avctx);
92 static av_cold int smvjpeg_decode_init(AVCodecContext *avctx)
94 SMVJpegDecodeContext *s = avctx->priv_data;
96 AVDictionary *thread_opt = NULL;
99 s->frames_per_jpeg = 0;
101 s->picture[0] = av_frame_alloc();
103 return AVERROR(ENOMEM);
105 s->picture[1] = av_frame_alloc();
106 if (!s->picture[1]) {
107 av_frame_free(&s->picture[0]);
108 return AVERROR(ENOMEM);
111 s->jpg.picture_ptr = s->picture[0];
113 if (avctx->extradata_size >= 4)
114 s->frames_per_jpeg = AV_RL32(avctx->extradata);
116 if (s->frames_per_jpeg <= 0) {
117 av_log(avctx, AV_LOG_ERROR, "Invalid number of frames per jpeg.\n");
118 ret = AVERROR_INVALIDDATA;
121 codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
123 av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n");
124 smvjpeg_decode_end(avctx);
125 return AVERROR_DECODER_NOT_FOUND;
128 s->avctx = avcodec_alloc_context3(codec);
130 av_dict_set(&thread_opt, "threads", "1", 0);
131 s->avctx->refcounted_frames = 1;
132 s->avctx->flags = avctx->flags;
133 s->avctx->idct_algo = avctx->idct_algo;
134 if ((r = ff_codec_open2_recursive(s->avctx, codec, &thread_opt)) < 0) {
135 av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n");
138 av_dict_free(&thread_opt);
141 smvjpeg_decode_end(avctx);
145 static int smvjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
148 const AVPixFmtDescriptor *desc;
149 SMVJpegDecodeContext *s = avctx->priv_data;
150 AVFrame* mjpeg_data = s->picture[0];
151 int i, cur_frame = 0, ret = 0;
153 cur_frame = avpkt->pts % s->frames_per_jpeg;
155 /* Are we at the start of a block? */
157 av_frame_unref(mjpeg_data);
158 ret = avcodec_decode_video2(s->avctx, mjpeg_data, &s->mjpeg_data_size, avpkt);
160 s->mjpeg_data_size = 0;
163 } else if (!s->mjpeg_data_size)
164 return AVERROR(EINVAL);
166 desc = av_pix_fmt_desc_get(s->avctx->pix_fmt);
169 if (mjpeg_data->height % (s->frames_per_jpeg << desc->log2_chroma_h)) {
170 av_log(avctx, AV_LOG_ERROR, "Invalid height\n");
171 return AVERROR_INVALIDDATA;
174 /*use the last lot... */
175 *data_size = s->mjpeg_data_size;
177 avctx->pix_fmt = s->avctx->pix_fmt;
179 /* We shouldn't get here if frames_per_jpeg <= 0 because this was rejected
181 ret = ff_set_dimensions(avctx, mjpeg_data->width, mjpeg_data->height / s->frames_per_jpeg);
183 av_log(s, AV_LOG_ERROR, "Failed to set dimensions\n");
188 s->picture[1]->extended_data = NULL;
189 s->picture[1]->width = avctx->width;
190 s->picture[1]->height = avctx->height;
191 s->picture[1]->format = avctx->pix_fmt;
192 /* ff_init_buffer_info(avctx, &s->picture[1]); */
193 smv_img_pnt(s->picture[1]->data, mjpeg_data->data, mjpeg_data->linesize,
194 avctx->pix_fmt, avctx->width, avctx->height, cur_frame);
195 for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
196 s->picture[1]->linesize[i] = mjpeg_data->linesize[i];
198 ret = av_frame_ref(data, s->picture[1]);
204 static const AVClass smvjpegdec_class = {
205 .class_name = "SMVJPEG decoder",
206 .item_name = av_default_item_name,
207 .version = LIBAVUTIL_VERSION_INT,
210 AVCodec ff_smvjpeg_decoder = {
212 .long_name = NULL_IF_CONFIG_SMALL("SMV JPEG"),
213 .type = AVMEDIA_TYPE_VIDEO,
214 .id = AV_CODEC_ID_SMVJPEG,
215 .priv_data_size = sizeof(SMVJpegDecodeContext),
216 .init = smvjpeg_decode_init,
217 .close = smvjpeg_decode_end,
218 .decode = smvjpeg_decode_frame,
219 .priv_class = &smvjpegdec_class,