FFmpeg
rl2.c
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1 /*
2  * RL2 Video Decoder
3  * Copyright (C) 2008 Sascha Sommer (saschasommer@freenet.de)
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  * RL2 Video Decoder
25  * @author Sascha Sommer (saschasommer@freenet.de)
26  * @see http://wiki.multimedia.cx/index.php?title=RL2
27  */
28 
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 
33 #include "libavutil/internal.h"
34 #include "libavutil/intreadwrite.h"
35 #include "libavutil/mem.h"
36 #include "avcodec.h"
37 #include "internal.h"
38 
39 
40 #define EXTRADATA1_SIZE (6 + 256 * 3) ///< video base, clr count, palette
41 
42 typedef struct Rl2Context {
44 
45  uint16_t video_base; ///< initial drawing offset
46  uint32_t clr_count; ///< number of used colors (currently unused)
47  uint8_t *back_frame; ///< background frame
49 } Rl2Context;
50 
51 /**
52  * Run Length Decode a single 320x200 frame
53  * @param s rl2 context
54  * @param in input buffer
55  * @param size input buffer size
56  * @param out output buffer
57  * @param stride stride of the output buffer
58  * @param video_base offset of the rle data inside the frame
59  */
60 static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size,
61  uint8_t *out, int stride, int video_base)
62 {
63  int base_x = video_base % s->avctx->width;
64  int base_y = video_base / s->avctx->width;
65  int stride_adj = stride - s->avctx->width;
66  int i;
67  const uint8_t *back_frame = s->back_frame;
68  const uint8_t *in_end = in + size;
69  const uint8_t *out_end = out + stride * s->avctx->height;
70  uint8_t *line_end;
71 
72  /** copy start of the background frame */
73  for (i = 0; i <= base_y; i++) {
74  if (s->back_frame)
75  memcpy(out, back_frame, s->avctx->width);
76  out += stride;
77  back_frame += s->avctx->width;
78  }
79  back_frame += base_x - s->avctx->width;
80  line_end = out - stride_adj;
81  out += base_x - stride;
82 
83  /** decode the variable part of the frame */
84  while (in < in_end) {
85  uint8_t val = *in++;
86  int len = 1;
87  if (val >= 0x80) {
88  if (in >= in_end)
89  break;
90  len = *in++;
91  if (!len)
92  break;
93  }
94 
95  if (len >= out_end - out)
96  break;
97 
98  if (s->back_frame)
99  val |= 0x80;
100  else
101  val &= ~0x80;
102 
103  while (len--) {
104  *out++ = (val == 0x80) ? *back_frame : val;
105  back_frame++;
106  if (out == line_end) {
107  out += stride_adj;
108  line_end += stride;
109  if (len >= out_end - out)
110  break;
111  }
112  }
113  }
114 
115  /** copy the rest from the background frame */
116  if (s->back_frame) {
117  while (out < out_end) {
118  memcpy(out, back_frame, line_end - out);
119  back_frame += line_end - out;
120  out = line_end + stride_adj;
121  line_end += stride;
122  }
123  }
124 }
125 
126 
127 /**
128  * Initialize the decoder
129  * @param avctx decoder context
130  * @return 0 success, -1 on error
131  */
133 {
134  Rl2Context *s = avctx->priv_data;
135  int back_size;
136  int i;
137 
138  s->avctx = avctx;
139  avctx->pix_fmt = AV_PIX_FMT_PAL8;
140 
141  /** parse extra data */
142  if (!avctx->extradata || avctx->extradata_size < EXTRADATA1_SIZE) {
143  av_log(avctx, AV_LOG_ERROR, "invalid extradata size\n");
144  return AVERROR(EINVAL);
145  }
146 
147  /** get frame_offset */
148  s->video_base = AV_RL16(&avctx->extradata[0]);
149  s->clr_count = AV_RL32(&avctx->extradata[2]);
150 
151  if (s->video_base >= avctx->width * avctx->height) {
152  av_log(avctx, AV_LOG_ERROR, "invalid video_base\n");
153  return AVERROR_INVALIDDATA;
154  }
155 
156  /** initialize palette */
157  for (i = 0; i < AVPALETTE_COUNT; i++)
158  s->palette[i] = 0xFFU << 24 | AV_RB24(&avctx->extradata[6 + i * 3]);
159 
160  /** decode background frame if present */
161  back_size = avctx->extradata_size - EXTRADATA1_SIZE;
162 
163  if (back_size > 0) {
164  uint8_t *back_frame = av_mallocz(avctx->width*avctx->height);
165  if (!back_frame)
166  return AVERROR(ENOMEM);
167  rl2_rle_decode(s, avctx->extradata + EXTRADATA1_SIZE, back_size,
168  back_frame, avctx->width, 0);
169  s->back_frame = back_frame;
170  }
171  return 0;
172 }
173 
174 
176  void *data, int *got_frame,
177  AVPacket *avpkt)
178 {
179  AVFrame *frame = data;
180  const uint8_t *buf = avpkt->data;
181  int ret, buf_size = avpkt->size;
182  Rl2Context *s = avctx->priv_data;
183 
184  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
185  return ret;
186 
187  /** run length decode */
188  rl2_rle_decode(s, buf, buf_size, frame->data[0], frame->linesize[0],
189  s->video_base);
190 
191  /** make the palette available on the way out */
192  memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
193 
194  *got_frame = 1;
195 
196  /** report that the buffer was completely consumed */
197  return buf_size;
198 }
199 
200 
201 /**
202  * Uninit decoder
203  * @param avctx decoder context
204  * @return 0 success, -1 on error
205  */
207 {
208  Rl2Context *s = avctx->priv_data;
209 
210  av_freep(&s->back_frame);
211 
212  return 0;
213 }
214 
215 
217  .name = "rl2",
218  .long_name = NULL_IF_CONFIG_SMALL("RL2 video"),
219  .type = AVMEDIA_TYPE_VIDEO,
220  .id = AV_CODEC_ID_RL2,
221  .priv_data_size = sizeof(Rl2Context),
223  .close = rl2_decode_end,
225  .capabilities = AV_CODEC_CAP_DR1,
226 };
const char const char void * val
Definition: avisynth_c.h:863
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:268
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
Memory handling functions.
#define EXTRADATA1_SIZE
video base, clr count, palette
Definition: rl2.c:40
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int size
Definition: avcodec.h:1478
static av_cold int rl2_decode_end(AVCodecContext *avctx)
Uninit decoder.
Definition: rl2.c:206
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
AVCodec.
Definition: avcodec.h:3477
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
uint8_t
#define av_cold
Definition: attributes.h:82
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
#define AVPALETTE_SIZE
Definition: pixfmt.h:32
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1666
AVCodec ff_rl2_decoder
Definition: rl2.c:216
uint8_t * data
Definition: avcodec.h:1477
ptrdiff_t size
Definition: opengl_enc.c:100
#define av_log(a,...)
AVCodecContext * avctx
Definition: rl2.c:43
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size, uint8_t *out, int stride, int video_base)
Run Length Decode a single 320x200 frame.
Definition: rl2.c:60
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
const char * name
Name of the codec implementation.
Definition: avcodec.h:3484
Definition: rl2.c:42
common internal API header
int width
picture width / height.
Definition: avcodec.h:1738
static int rl2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: rl2.c:175
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define s(width, name)
Definition: cbs_vp9.c:257
uint8_t * back_frame
background frame
Definition: rl2.c:47
uint16_t video_base
initial drawing offset
Definition: rl2.c:45
Libavcodec external API header.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:87
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:299
main external API structure.
Definition: avcodec.h:1565
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1964
void * buf
Definition: avisynth_c.h:766
int extradata_size
Definition: avcodec.h:1667
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
uint32_t palette[AVPALETTE_COUNT]
Definition: rl2.c:48
#define AVPALETTE_COUNT
Definition: pixfmt.h:33
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:282
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:104
common internal api header.
static av_cold int rl2_decode_init(AVCodecContext *avctx)
Initialize the decoder.
Definition: rl2.c:132
void * priv_data
Definition: avcodec.h:1592
uint32_t clr_count
number of used colors (currently unused)
Definition: rl2.c:46
int len
FILE * out
Definition: movenc.c:54
#define av_freep(p)
#define stride
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1454
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981