FFmpeg: libavcodec/nuv.c Source File

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libavcodec

nuv.c

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1 /*

2 * NuppelVideo decoder

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 */

22 #include <stdio.h>

23 #include <stdlib.h>

24 #include <limits.h>

26 #include "libavutil/bswap.h"

27 #include "libavutil/common.h"

28 #include "libavutil/intreadwrite.h"

29 #include "libavutil/lzo.h"

30 #include "libavutil/imgutils.h"

31 #include "avcodec.h"

32 #include "idctdsp.h"

33 #include "internal.h"

34 #include "rtjpeg.h"

36 typedef struct NuvContext {

37 AVFrame *pic;

38 int codec_frameheader;

39 int quality;

40 int width, height;

41 unsigned int decomp_size;

42 unsigned char *decomp_buf;

43 uint32_t lq[64], cq[64];

44 RTJpegContext rtj;

45 } NuvContext;

47 static const uint8_t fallback_lquant[] = {

48 16, 11, 10, 16, 24, 40, 51, 61,

49 12, 12, 14, 19, 26, 58, 60, 55,

50 14, 13, 16, 24, 40, 57, 69, 56,

51 14, 17, 22, 29, 51, 87, 80, 62,

52 18, 22, 37, 56, 68, 109, 103, 77,

53 24, 35, 55, 64, 81, 104, 113, 92,

54 49, 64, 78, 87, 103, 121, 120, 101,

55 72, 92, 95, 98, 112, 100, 103, 99

56 };

58 static const uint8_t fallback_cquant[] = {

59 17, 18, 24, 47, 99, 99, 99, 99,

60 18, 21, 26, 66, 99, 99, 99, 99,

61 24, 26, 56, 99, 99, 99, 99, 99,

62 47, 66, 99, 99, 99, 99, 99, 99,

63 99, 99, 99, 99, 99, 99, 99, 99,

64 99, 99, 99, 99, 99, 99, 99, 99,

65 99, 99, 99, 99, 99, 99, 99, 99,

66 99, 99, 99, 99, 99, 99, 99, 99

67 };

69 /**

70 * @brief copy frame data from buffer to AVFrame, handling stride.

71 * @param f destination AVFrame

72 * @param src source buffer, does not use any line-stride

73 * @param width width of the video frame

74 * @param height height of the video frame

75 */

76 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)

77 {

78 uint8_t *src_data[4];

79 int src_linesize[4];

80 av_image_fill_arrays(src_data, src_linesize, src,

81 f->format, width, height, 1);

82 av_image_copy(f->data, f->linesize, (const uint8_t **)src_data, src_linesize,

83 f->format, width, height);

84 }

86 /**

87 * @brief extract quantization tables from codec data into our context

88 */

89 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,

90 int size)

91 {

92 int i;

93 if (size < 2 * 64 * 4) {

94 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");

95 return AVERROR_INVALIDDATA;

96 }

97 for (i = 0; i < 64; i++, buf += 4)

98 c->lq[i] = AV_RL32(buf);

99 for (i = 0; i < 64; i++, buf += 4)

100 c->cq[i] = AV_RL32(buf);

101 return 0;

102 }

103

104 /**

105 * @brief set quantization tables from a quality value

106 */

107 static void get_quant_quality(NuvContext *c, int quality)

108 {

109 int i;

110 quality = FFMAX(quality, 1);

111 for (i = 0; i < 64; i++) {

112 c->lq[i] = (fallback_lquant[i] << 7) / quality;

113 c->cq[i] = (fallback_cquant[i] << 7) / quality;

114 }

115 }

116

117 static int codec_reinit(AVCodecContext *avctx, int width, int height,

118 int quality)

119 {

120 NuvContext *c = avctx->priv_data;

121 int ret;

122

123 width = FFALIGN(width, 2);

124 height = FFALIGN(height, 2);

125 if (quality >= 0)

126 get_quant_quality(c, quality);

127 if (width != c->width || height != c->height) {

128 // also reserve space for a possible additional header

129 int buf_size = height * width * 3 / 2

130 + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)

131 + RTJPEG_HEADER_SIZE;

132 if (buf_size > INT_MAX/8)

133 return -1;

134 if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)

135 return ret;

136 avctx->width = c->width = width;

137 avctx->height = c->height = height;

138 av_fast_malloc(&c->decomp_buf, &c->decomp_size,

139 buf_size);

140 if (!c->decomp_buf) {

141 av_log(avctx, AV_LOG_ERROR,

142 "Can't allocate decompression buffer.\n");

143 return AVERROR(ENOMEM);

144 }

145 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);

146 av_frame_unref(c->pic);

147 return 1;

148 } else if (quality != c->quality)

149 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);

150

151 return 0;

152 }

153

154 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

155 AVPacket *avpkt)

156 {

157 const uint8_t *buf = avpkt->data;

158 int buf_size = avpkt->size;

159 NuvContext *c = avctx->priv_data;

160 AVFrame *picture = data;

161 int orig_size = buf_size;

162 int keyframe, ret;

163 int size_change = 0;

164 int minsize = 0;

165 int result, init_frame = !avctx->frame_number;

166 enum {

167 NUV_UNCOMPRESSED = '0',

168 NUV_RTJPEG = '1',

169 NUV_RTJPEG_IN_LZO = '2',

170 NUV_LZO = '3',

171 NUV_BLACK = 'N',

172 NUV_COPY_LAST = 'L'

173 } comptype;

174

175 if (buf_size < 12) {

176 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");

177 return AVERROR_INVALIDDATA;

178 }

179

180 // codec data (rtjpeg quant tables)

181 if (buf[0] == 'D' && buf[1] == 'R') {

182 int ret;

183 // Skip the rest of the frame header.

184 buf = &buf[12];

185 buf_size -= 12;

186 ret = get_quant(avctx, c, buf, buf_size);

187 if (ret < 0)

188 return ret;

189 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);

190 return orig_size;

191 }

192

193 if (buf_size < 12 || buf[0] != 'V') {

194 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");

195 return AVERROR_INVALIDDATA;

196 }

197 comptype = buf[1];

198 switch (comptype) {

199 case NUV_RTJPEG_IN_LZO:

200 case NUV_RTJPEG:

201 keyframe = !buf[2];

202 if (c->width < 16 || c->height < 16) {

203 return AVERROR_INVALIDDATA;

204 }

205 break;

206 case NUV_COPY_LAST:

207 keyframe = 0;

208 break;

209 default:

210 keyframe = 1;

211 break;

212 }

213 switch (comptype) {

214 case NUV_UNCOMPRESSED:

215 minsize = c->width * c->height * 3 / 2;

216 break;

217 case NUV_RTJPEG:

218 minsize = c->width/16 * (c->height/16) * 6;

219 break;

220 }

221 if (buf_size < minsize / 4)

222 return AVERROR_INVALIDDATA;

223 retry:

224 // Skip the rest of the frame header.

225 buf = &buf[12];

226 buf_size -= 12;

227 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {

228 int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);

229 int inlen = buf_size;

230 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {

231 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");

232 return AVERROR_INVALIDDATA;

233 }

234 buf = c->decomp_buf;

235 buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;

236 memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);

237 }

238 if (c->codec_frameheader) {

239 int w, h, q;

240 if (buf_size < RTJPEG_HEADER_SIZE) {

241 av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");

242 return AVERROR_INVALIDDATA;

243 }

244 // There seem to exist two variants of this header: one starts with 'V'

245 // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,

246 // 1 byte header size (== 12), 1 byte version (== 0)

247 if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {

248 av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");

249 return AVERROR_INVALIDDATA;

250 }

251 w = AV_RL16(&buf[6]);

252 h = AV_RL16(&buf[8]);

253 q = buf[10];

254 if ((result = codec_reinit(avctx, w, h, q)) < 0)

255 return result;

256 if (result) {

257 buf = avpkt->data;

258 buf_size = avpkt->size;

259 size_change = 1;

260 goto retry;

261 }

262 buf = &buf[RTJPEG_HEADER_SIZE];

263 buf_size -= RTJPEG_HEADER_SIZE;

264 }

265

266 if (size_change || keyframe) {

267 av_frame_unref(c->pic);

268 init_frame = 1;

269 }

270

271 if ((result = ff_reget_buffer(avctx, c->pic)) < 0)

272 return result;

273 if (init_frame) {

274 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);

275 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);

276 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);

277 }

278

279 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;

280 c->pic->key_frame = keyframe;

281 // decompress/copy/whatever data

282 switch (comptype) {

283 case NUV_LZO:

284 case NUV_UNCOMPRESSED: {

285 int height = c->height;

286 if (buf_size < c->width * height * 3 / 2) {

287 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");

288 height = buf_size / c->width / 3 * 2;

289 }

290 if(height > 0)

291 copy_frame(c->pic, buf, c->width, height);

292 break;

293 }

294 case NUV_RTJPEG_IN_LZO:

295 case NUV_RTJPEG:

296 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);

297 if (ret < 0)

298 return ret;

299 break;

300 case NUV_BLACK:

301 memset(c->pic->data[0], 0, c->width * c->height);

302 memset(c->pic->data[1], 128, c->width * c->height / 4);

303 memset(c->pic->data[2], 128, c->width * c->height / 4);

304 break;

305 case NUV_COPY_LAST:

306 /* nothing more to do here */

307 break;

308 default:

309 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");

310 return AVERROR_INVALIDDATA;

311 }

312

313 if ((result = av_frame_ref(picture, c->pic)) < 0)

314 return result;

315

316 *got_frame = 1;

317 return orig_size;

318 }

319

320 static av_cold int decode_init(AVCodecContext *avctx)

321 {

322 NuvContext *c = avctx->priv_data;

323 int ret;

324

325 c->pic = av_frame_alloc();

326 if (!c->pic)

327 return AVERROR(ENOMEM);

328

329 avctx->pix_fmt = AV_PIX_FMT_YUV420P;

330 c->decomp_buf = NULL;

331 c->quality = -1;

332 c->width = 0;

333 c->height = 0;

334

335 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');

336

337 if (avctx->extradata_size)

338 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);

339

340 ff_rtjpeg_init(&c->rtj, avctx);

341

342 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)

343 return ret;

344

345 return 0;

346 }

347

348 static av_cold int decode_end(AVCodecContext *avctx)

349 {

350 NuvContext *c = avctx->priv_data;

351

352 av_freep(&c->decomp_buf);

353 av_frame_free(&c->pic);

354

355 return 0;

356 }

357

358 AVCodec ff_nuv_decoder = {

359 .name = "nuv",

360 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),

361 .type = AVMEDIA_TYPE_VIDEO,

362 .id = AV_CODEC_ID_NUV,

363 .priv_data_size = sizeof(NuvContext),

364 .init = decode_init,

365 .close = decode_end,

366 .decode = decode_frame,

367 .capabilities = AV_CODEC_CAP_DR1,

368 };

NULL

#define NULL

Definition: coverity.c:32

decode_end

static av_cold int decode_end(AVCodecContext *avctx)

Definition: nuv.c:348

AVERROR_INVALIDDATA

#define AVERROR_INVALIDDATA

Invalid data found when processing input.

Definition: error.h:59

NuvContext::width

int width

Definition: nuv.c:40

AVFrame

This structure describes decoded (raw) audio or video data.

Definition: frame.h:218

NuvContext::height

int height

Definition: nuv.c:40

Definition: vp9dsp_template.c:2038

data

ptrdiff_t const GLvoid * data

Definition: opengl_enc.c:101

imgutils.h

misc image utilities

init

static av_cold int init(AVCodecContext *avctx)

Definition: avrndec.c:35

AVPacket::size

int size

Definition: avcodec.h:1431

av_image_fill_arrays

int av_image_fill_arrays(uint8_t *dst_data[4], int dst_linesize[4], const uint8_t *src, enum AVPixelFormat pix_fmt, int width, int height, int align)

Setup the data pointers and linesizes based on the specified image parameters and the provided array...

Definition: imgutils.c:411

get_quant

static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf, int size)

extract quantization tables from codec data into our context

Definition: nuv.c:89

NuvContext::codec_frameheader

int codec_frameheader

Definition: nuv.c:38

AVCodecContext::pix_fmt

enum AVPixelFormat pix_fmt

Pixel format, see AV_PIX_FMT_xxx.

Definition: avcodec.h:1727

get_quant_quality

static void get_quant_quality(NuvContext *c, int quality)

set quantization tables from a quality value

Definition: nuv.c:107

fallback_lquant

static const uint8_t fallback_lquant[]

Definition: nuv.c:47

src

#define src

Definition: vp8dsp.c:254

AVCodec

AVCodec.

Definition: avcodec.h:3408

AV_RL16

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16

Definition: bytestream.h:87

decode

static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)

Definition: decode_audio.c:42

ff_reget_buffer

int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)

Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...

Definition: decode.c:1938

NuvContext::quality

int quality

Definition: nuv.c:39

AV_CODEC_ID_NUV

Definition: avcodec.h:302

NuvContext

Definition: nuv.c:36

uint8_t

Definition: audio_convert.c:194

av_cold

#define av_cold

Definition: attributes.h:82

av_frame_alloc

AVFrame * av_frame_alloc(void)

Allocate an AVFrame and set its fields to default values.

Definition: frame.c:189

ff_rtjpeg_decode_frame_yuv420

int ff_rtjpeg_decode_frame_yuv420(RTJpegContext *c, AVFrame *f, const uint8_t *buf, int buf_size)

decode one rtjpeg YUV420 frame

Definition: rtjpeg.c:106

ff_rtjpeg_init

void ff_rtjpeg_init(RTJpegContext *c, AVCodecContext *avctx)

Definition: rtjpeg.c:170

av_frame_ref

int av_frame_ref(AVFrame *dst, const AVFrame *src)

Set up a new reference to the data described by the source frame.

Definition: frame.c:441

AV_LZO_OUTPUT_PADDING

#define AV_LZO_OUTPUT_PADDING

Definition: lzo.h:47

AVCodecContext::extradata

uint8_t * extradata

some codecs need / can use extradata like Huffman tables.

Definition: avcodec.h:1618

height

#define height

AVPacket::data

uint8_t * data

Definition: avcodec.h:1430

size

ptrdiff_t size

Definition: opengl_enc.c:101

FFALIGN

#define FFALIGN(x, a)

Definition: macros.h:48

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

AVERROR

#define AVERROR(e)

Definition: error.h:43

av_frame_free

void av_frame_free(AVFrame **frame)

Free the frame and any dynamically allocated objects in it, e.g.

Definition: frame.c:202

NULL_IF_CONFIG_SMALL

#define NULL_IF_CONFIG_SMALL(x)

Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...

Definition: internal.h:186

rtjpeg.h

width

uint16_t width

Definition: gdv.c:47

AVCodec::name

const char * name

Name of the codec implementation.

Definition: avcodec.h:3415

FFMAX

#define FFMAX(a, b)

Definition: common.h:94

idctdsp.h

av_image_copy

void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], const uint8_t *src_data[4], const int src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)

Copy image in src_data to dst_data.

Definition: imgutils.c:387

decode_init

static av_cold int decode_init(AVCodecContext *avctx)

Definition: nuv.c:320

ff_nuv_decoder

AVCodec ff_nuv_decoder

Definition: nuv.c:358

av_fast_malloc

void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)

Allocate a buffer, reusing the given one if large enough.

Definition: mem.c:488

NuvContext::decomp_buf

unsigned char * decomp_buf

Definition: nuv.c:42

av_image_check_size

int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)

Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...

Definition: imgutils.c:282

AV_PICTURE_TYPE_I

Intra.

Definition: avutil.h:274

AVFrame::pict_type

enum AVPictureType pict_type

Picture type of the frame.

Definition: frame.h:301

intreadwrite.h

AVCodecContext::width

int width

picture width / height.

Definition: avcodec.h:1690

uint8_t w

Definition: llviddspenc.c:38

ff_rtjpeg_decode_init

void ff_rtjpeg_decode_init(RTJpegContext *c, int width, int height, const uint32_t *lquant, const uint32_t *cquant)

initialize an RTJpegContext, may be called multiple times

Definition: rtjpeg.c:158

av_lzo1x_decode

int av_lzo1x_decode(void *out, int *outlen, const void *in, int *inlen)

Decodes LZO 1x compressed data.

Definition: lzo.c:134

AVCodecContext::height

int height

Definition: avcodec.h:1690

AVFrame::format

int format

format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...

Definition: frame.h:291

avcodec.h

Libavcodec external API header.

AVFrame::linesize

int linesize[AV_NUM_DATA_POINTERS]

For video, size in bytes of each picture line.

Definition: frame.h:249

AVCodecContext

main external API structure.

Definition: avcodec.h:1518

copy_frame

static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)

copy frame data from buffer to AVFrame, handling stride.

Definition: nuv.c:76

AVCodecContext::codec_tag

unsigned int codec_tag

fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').

Definition: avcodec.h:1543

buf

void * buf

Definition: avisynth_c.h:690

AVCodecContext::extradata_size

int extradata_size

Definition: avcodec.h:1619

bswap.h

byte swapping routines

RTJpegContext

Definition: rtjpeg.h:33

NuvContext::decomp_size

unsigned int decomp_size

Definition: nuv.c:41

av_frame_unref

void av_frame_unref(AVFrame *frame)

Unreference all the buffers referenced by frame and reset the frame fields.

Definition: frame.c:551

AVFrame::data

uint8_t * data[AV_NUM_DATA_POINTERS]

pointer to the picture/channel planes.

Definition: frame.h:232

limits.h

fallback_cquant

static const uint8_t fallback_cquant[]

Definition: nuv.c:58

AV_PIX_FMT_YUV420P

planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)

Definition: pixfmt.h:62

internal.h

common internal api header.

common.h

common internal and external API header

static double c[64]

Definition: vsrc_mptestsrc.c:87

NuvContext::pic

AVFrame * pic

Definition: nuv.c:37

AV_INPUT_BUFFER_PADDING_SIZE

#define AV_INPUT_BUFFER_PADDING_SIZE

Required number of additionally allocated bytes at the end of the input bitstream for decoding...

Definition: avcodec.h:773

AVCodecContext::priv_data

void * priv_data

Definition: avcodec.h:1545

codec_reinit

static int codec_reinit(AVCodecContext *avctx, int width, int height, int quality)

Definition: nuv.c:117

NuvContext::lq

uint32_t lq[64]

Definition: nuv.c:43

RTJPEG_HEADER_SIZE

#define RTJPEG_HEADER_SIZE

Definition: rtjpeg.h:31

AVFrame::key_frame

int key_frame

1 -> keyframe, 0-> not

Definition: frame.h:296

AVCodecContext::frame_number

int frame_number

Frame counter, set by libavcodec.

Definition: avcodec.h:2204

av_freep

#define av_freep(p)

Definition: tableprint_vlc.h:35

init_frame

static void init_frame(FlacEncodeContext *s, int nb_samples)

Definition: flacenc.c:470

decode_frame

static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)

Definition: nuv.c:154

AVMEDIA_TYPE_VIDEO

Definition: avutil.h:201

NuvContext::rtj

RTJpegContext rtj

Definition: nuv.c:44

MKTAG

#define MKTAG(a, b, c, d)

Definition: common.h:366

AV_RL32

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32

Definition: bytestream.h:87

AVPacket

This structure stores compressed data.

Definition: avcodec.h:1407

AV_CODEC_CAP_DR1

#define AV_CODEC_CAP_DR1

Codec uses get_buffer() for allocating buffers and supports custom allocators.

Definition: avcodec.h:959

NuvContext::cq

uint32_t cq[64]

Definition: nuv.c:43

AV_PICTURE_TYPE_P

Predicted.

Definition: avutil.h:275

lzo.h

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