h264/aarch64: optimize neon loop filter
[libav.git] / libavformat / avs.c
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1/*
2 * AVS demuxer.
3 * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
4 *
2912e87a 5 * This file is part of Libav.
b78e7197 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
26376701 11 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
e5a389a1 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
21
22#include "avformat.h"
23#include "voc.h"
24
25
26typedef struct avs_format {
e998ba4f 27 VocDecContext voc;
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28 AVStream *st_video;
29 AVStream *st_audio;
30 int width;
31 int height;
32 int bits_per_sample;
33 int fps;
34 int nb_frames;
35 int remaining_frame_size;
36 int remaining_audio_size;
e998ba4f 37} AvsFormat;
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38
39typedef enum avs_block_type {
696c3068 40 AVS_NONE = 0x00,
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41 AVS_VIDEO = 0x01,
42 AVS_AUDIO = 0x02,
43 AVS_PALETTE = 0x03,
44 AVS_GAME_DATA = 0x04,
e998ba4f 45} AvsBlockType;
26376701 46
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47static int avs_probe(AVProbeData * p)
48{
49 const uint8_t *d;
50
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51 d = p->buf;
52 if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
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53 /* Ensure the buffer probe scores higher than the extension probe.
54 * This avoids problems with misdetection as AviSynth scripts. */
55 return AVPROBE_SCORE_EXTENSION + 1;
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56
57 return 0;
58}
59
6e9651d1 60static int avs_read_header(AVFormatContext * s)
26376701 61{
e998ba4f 62 AvsFormat *avs = s->priv_data;
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63
64 s->ctx_flags |= AVFMTCTX_NOHEADER;
65
45a8a02a 66 avio_skip(s->pb, 4);
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67 avs->width = avio_rl16(s->pb);
68 avs->height = avio_rl16(s->pb);
69 avs->bits_per_sample = avio_rl16(s->pb);
70 avs->fps = avio_rl16(s->pb);
71 avs->nb_frames = avio_rl32(s->pb);
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72 avs->remaining_frame_size = 0;
73 avs->remaining_audio_size = 0;
74
75 avs->st_video = avs->st_audio = NULL;
76
77 if (avs->width != 318 || avs->height != 198)
78 av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
79 "when the avs format is supposed to be 318x198 only.\n",
80 avs->width, avs->height);
81
82 return 0;
83}
84
85static int
86avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
e998ba4f 87 AvsBlockType type, int sub_type, int size,
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88 uint8_t * palette, int palette_size)
89{
e998ba4f 90 AvsFormat *avs = s->priv_data;
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91 int ret;
92
93 ret = av_new_packet(pkt, size + palette_size);
94 if (ret < 0)
95 return ret;
96
97 if (palette_size) {
98 pkt->data[0] = 0x00;
99 pkt->data[1] = 0x03;
100 pkt->data[2] = palette_size & 0xFF;
101 pkt->data[3] = (palette_size >> 8) & 0xFF;
102 memcpy(pkt->data + 4, palette, palette_size - 4);
103 }
104
105 pkt->data[palette_size + 0] = sub_type;
106 pkt->data[palette_size + 1] = type;
107 pkt->data[palette_size + 2] = size & 0xFF;
108 pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
b7effd4e 109 ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
26376701 110 if (ret < size) {
ce70f28a 111 av_packet_unref(pkt);
6f3e0b21 112 return AVERROR(EIO);
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113 }
114
115 pkt->size = ret + palette_size;
116 pkt->stream_index = avs->st_video->index;
117 if (sub_type == 0)
cc947f04 118 pkt->flags |= AV_PKT_FLAG_KEY;
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119
120 return 0;
121}
122
123static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
124{
e998ba4f 125 AvsFormat *avs = s->priv_data;
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126 int ret, size;
127
a2704c97 128 size = avio_tell(s->pb);
167f3b8d 129 ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
a2704c97 130 size = avio_tell(s->pb) - size;
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131 avs->remaining_audio_size -= size;
132
6f3e0b21 133 if (ret == AVERROR(EIO))
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134 return 0; /* this indicate EOS */
135 if (ret < 0)
136 return ret;
137
138 pkt->stream_index = avs->st_audio->index;
cc947f04 139 pkt->flags |= AV_PKT_FLAG_KEY;
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140
141 return size;
142}
143
144static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
145{
e998ba4f 146 AvsFormat *avs = s->priv_data;
26376701 147 int sub_type = 0, size = 0;
e998ba4f 148 AvsBlockType type = AVS_NONE;
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149 int palette_size = 0;
150 uint8_t palette[4 + 3 * 256];
151 int ret;
152
153 if (avs->remaining_audio_size > 0)
154 if (avs_read_audio_packet(s, pkt) > 0)
155 return 0;
156
157 while (1) {
158 if (avs->remaining_frame_size <= 0) {
b7effd4e 159 if (!avio_rl16(s->pb)) /* found EOF */
6f3e0b21 160 return AVERROR(EIO);
b7effd4e 161 avs->remaining_frame_size = avio_rl16(s->pb) - 4;
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162 }
163
164 while (avs->remaining_frame_size > 0) {
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165 sub_type = avio_r8(s->pb);
166 type = avio_r8(s->pb);
167 size = avio_rl16(s->pb);
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168 if (size < 4)
169 return AVERROR_INVALIDDATA;
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170 avs->remaining_frame_size -= size;
171
172 switch (type) {
173 case AVS_PALETTE:
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174 if (size - 4 > sizeof(palette))
175 return AVERROR_INVALIDDATA;
b7effd4e 176 ret = avio_read(s->pb, palette, size - 4);
26376701 177 if (ret < size - 4)
6f3e0b21 178 return AVERROR(EIO);
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179 palette_size = size;
180 break;
181
182 case AVS_VIDEO:
183 if (!avs->st_video) {
84ad31ff 184 avs->st_video = avformat_new_stream(s, NULL);
f929ab05 185 if (!avs->st_video)
769e10f0 186 return AVERROR(ENOMEM);
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187 avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
188 avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
189 avs->st_video->codecpar->width = avs->width;
190 avs->st_video->codecpar->height = avs->height;
191 avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
26376701 192 avs->st_video->nb_frames = avs->nb_frames;
aba232cf 193 avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
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194 }
195 return avs_read_video_packet(s, pkt, type, sub_type, size,
196 palette, palette_size);
197
198 case AVS_AUDIO:
199 if (!avs->st_audio) {
84ad31ff 200 avs->st_audio = avformat_new_stream(s, NULL);
f929ab05 201 if (!avs->st_audio)
769e10f0 202 return AVERROR(ENOMEM);
9200514a 203 avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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204 }
205 avs->remaining_audio_size = size - 4;
206 size = avs_read_audio_packet(s, pkt);
207 if (size != 0)
208 return size;
209 break;
210
211 default:
45a8a02a 212 avio_skip(s->pb, size - 4);
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213 }
214 }
215 }
216}
217
218static int avs_read_close(AVFormatContext * s)
219{
220 return 0;
221}
222
c6610a21 223AVInputFormat ff_avs_demuxer = {
dfc2c4d9 224 .name = "avs",
6774247a 225 .long_name = NULL_IF_CONFIG_SMALL("AVS"),
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226 .priv_data_size = sizeof(AvsFormat),
227 .read_probe = avs_probe,
228 .read_header = avs_read_header,
229 .read_packet = avs_read_packet,
230 .read_close = avs_read_close,
26376701 231};