| 1 | /* |
| 2 | * SMV JPEG decoder |
| 3 | * Copyright (c) 2013 Ash Hughes |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * SMV JPEG decoder. |
| 25 | */ |
| 26 | |
| 27 | // #define DEBUG |
| 28 | #include "avcodec.h" |
| 29 | #include "libavutil/opt.h" |
| 30 | #include "libavutil/imgutils.h" |
| 31 | #include "mjpegdec.h" |
| 32 | #include "internal.h" |
| 33 | |
| 34 | typedef struct SMVJpegDecodeContext { |
| 35 | MJpegDecodeContext jpg; |
| 36 | AVFrame *picture[2]; /* pictures array */ |
| 37 | AVCodecContext* avctx; |
| 38 | int frames_per_jpeg; |
| 39 | int mjpeg_data_size; |
| 40 | } SMVJpegDecodeContext; |
| 41 | |
| 42 | static inline void smv_img_pnt_plane(uint8_t **dst, uint8_t *src, |
| 43 | int src_linesize, int height, int nlines) |
| 44 | { |
| 45 | if (!dst || !src) |
| 46 | return; |
| 47 | src += (nlines) * src_linesize * height; |
| 48 | *dst = src; |
| 49 | } |
| 50 | |
| 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 PixelFormat pix_fmt, int width, int height, |
| 54 | int nlines) |
| 55 | { |
| 56 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt); |
| 57 | int i, planes_nb = 0; |
| 58 | |
| 59 | if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL) |
| 60 | return; |
| 61 | |
| 62 | for (i = 0; i < desc->nb_components; i++) |
| 63 | planes_nb = FFMAX(planes_nb, desc->comp[i].plane + 1); |
| 64 | |
| 65 | for (i = 0; i < planes_nb; i++) { |
| 66 | int h = height; |
| 67 | if (i == 1 || i == 2) { |
| 68 | h = FF_CEIL_RSHIFT(height, desc->log2_chroma_h); |
| 69 | } |
| 70 | smv_img_pnt_plane(&dst_data[i], src_data[i], |
| 71 | src_linesizes[i], h, nlines); |
| 72 | } |
| 73 | if (desc->flags & AV_PIX_FMT_FLAG_PAL || |
| 74 | desc->flags & AV_PIX_FMT_FLAG_PSEUDOPAL) |
| 75 | dst_data[1] = src_data[1]; |
| 76 | } |
| 77 | |
| 78 | static av_cold int smvjpeg_decode_init(AVCodecContext *avctx) |
| 79 | { |
| 80 | SMVJpegDecodeContext *s = avctx->priv_data; |
| 81 | AVCodec *codec; |
| 82 | AVDictionary *thread_opt = NULL; |
| 83 | int ret = 0; |
| 84 | |
| 85 | s->frames_per_jpeg = 0; |
| 86 | |
| 87 | s->picture[0] = av_frame_alloc(); |
| 88 | if (!s->picture[0]) |
| 89 | return AVERROR(ENOMEM); |
| 90 | |
| 91 | s->picture[1] = av_frame_alloc(); |
| 92 | if (!s->picture[1]) |
| 93 | return AVERROR(ENOMEM); |
| 94 | |
| 95 | s->jpg.picture_ptr = s->picture[0]; |
| 96 | |
| 97 | if (avctx->extradata_size >= 4) |
| 98 | s->frames_per_jpeg = AV_RL32(avctx->extradata); |
| 99 | |
| 100 | if (s->frames_per_jpeg <= 0) { |
| 101 | av_log(avctx, AV_LOG_ERROR, "Invalid number of frames per jpeg.\n"); |
| 102 | ret = -1; |
| 103 | } |
| 104 | |
| 105 | codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG); |
| 106 | if (!codec) { |
| 107 | av_log(avctx, AV_LOG_ERROR, "MJPEG codec not found\n"); |
| 108 | ret = -1; |
| 109 | } |
| 110 | |
| 111 | s->avctx = avcodec_alloc_context3(codec); |
| 112 | |
| 113 | av_dict_set(&thread_opt, "threads", "1", 0); |
| 114 | s->avctx->refcounted_frames = 1; |
| 115 | s->avctx->flags = avctx->flags; |
| 116 | s->avctx->idct_algo = avctx->idct_algo; |
| 117 | if (ff_codec_open2_recursive(s->avctx, codec, &thread_opt) < 0) { |
| 118 | av_log(avctx, AV_LOG_ERROR, "MJPEG codec failed to open\n"); |
| 119 | ret = -1; |
| 120 | } |
| 121 | av_dict_free(&thread_opt); |
| 122 | |
| 123 | return ret; |
| 124 | } |
| 125 | |
| 126 | static int smvjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size, |
| 127 | AVPacket *avpkt) |
| 128 | { |
| 129 | const AVPixFmtDescriptor *desc; |
| 130 | SMVJpegDecodeContext *s = avctx->priv_data; |
| 131 | AVFrame* mjpeg_data = s->picture[0]; |
| 132 | int i, cur_frame = 0, ret = 0; |
| 133 | |
| 134 | cur_frame = avpkt->pts % s->frames_per_jpeg; |
| 135 | |
| 136 | /* Are we at the start of a block? */ |
| 137 | if (!cur_frame) { |
| 138 | av_frame_unref(mjpeg_data); |
| 139 | ret = avcodec_decode_video2(s->avctx, mjpeg_data, &s->mjpeg_data_size, avpkt); |
| 140 | } else if (!s->mjpeg_data_size) |
| 141 | return AVERROR(EINVAL); |
| 142 | |
| 143 | desc = av_pix_fmt_desc_get(s->avctx->pix_fmt); |
| 144 | if (desc && mjpeg_data->height % (s->frames_per_jpeg << desc->log2_chroma_h)) { |
| 145 | av_log(avctx, AV_LOG_ERROR, "Invalid height\n"); |
| 146 | return AVERROR_INVALIDDATA; |
| 147 | } |
| 148 | |
| 149 | /*use the last lot... */ |
| 150 | *data_size = s->mjpeg_data_size; |
| 151 | |
| 152 | avctx->pix_fmt = s->avctx->pix_fmt; |
| 153 | |
| 154 | /* We shouldn't get here if frames_per_jpeg <= 0 because this was rejected |
| 155 | in init */ |
| 156 | ret = ff_set_dimensions(avctx, mjpeg_data->width, mjpeg_data->height / s->frames_per_jpeg); |
| 157 | if (ret < 0) { |
| 158 | av_log(s, AV_LOG_ERROR, "Failed to set dimensions\n"); |
| 159 | return ret; |
| 160 | } |
| 161 | |
| 162 | if (*data_size) { |
| 163 | s->picture[1]->extended_data = NULL; |
| 164 | s->picture[1]->width = avctx->width; |
| 165 | s->picture[1]->height = avctx->height; |
| 166 | s->picture[1]->format = avctx->pix_fmt; |
| 167 | /* ff_init_buffer_info(avctx, &s->picture[1]); */ |
| 168 | smv_img_pnt(s->picture[1]->data, mjpeg_data->data, mjpeg_data->linesize, |
| 169 | avctx->pix_fmt, avctx->width, avctx->height, cur_frame); |
| 170 | for (i = 0; i < AV_NUM_DATA_POINTERS; i++) |
| 171 | s->picture[1]->linesize[i] = mjpeg_data->linesize[i]; |
| 172 | |
| 173 | ret = av_frame_ref(data, s->picture[1]); |
| 174 | } |
| 175 | |
| 176 | return ret; |
| 177 | } |
| 178 | |
| 179 | static av_cold int smvjpeg_decode_end(AVCodecContext *avctx) |
| 180 | { |
| 181 | SMVJpegDecodeContext *s = avctx->priv_data; |
| 182 | MJpegDecodeContext *jpg = &s->jpg; |
| 183 | int ret; |
| 184 | |
| 185 | jpg->picture_ptr = NULL; |
| 186 | av_frame_free(&s->picture[0]); |
| 187 | av_frame_free(&s->picture[1]); |
| 188 | ret = avcodec_close(s->avctx); |
| 189 | av_freep(&s->avctx); |
| 190 | return ret; |
| 191 | } |
| 192 | |
| 193 | static const AVClass smvjpegdec_class = { |
| 194 | .class_name = "SMVJPEG decoder", |
| 195 | .item_name = av_default_item_name, |
| 196 | .version = LIBAVUTIL_VERSION_INT, |
| 197 | }; |
| 198 | |
| 199 | AVCodec ff_smvjpeg_decoder = { |
| 200 | .name = "smvjpeg", |
| 201 | .long_name = NULL_IF_CONFIG_SMALL("SMV JPEG"), |
| 202 | .type = AVMEDIA_TYPE_VIDEO, |
| 203 | .id = AV_CODEC_ID_SMVJPEG, |
| 204 | .priv_data_size = sizeof(SMVJpegDecodeContext), |
| 205 | .init = smvjpeg_decode_init, |
| 206 | .close = smvjpeg_decode_end, |
| 207 | .decode = smvjpeg_decode_frame, |
| 208 | .priv_class = &smvjpegdec_class, |
| 209 | }; |