Replace all occurrences of AVERROR_IO with AVERROR(EIO).
[libav.git] / libavformat / c93.c
CommitLineData
9a0ddd09
AH
1/*
2 * Interplay C93 demuxer
3 * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
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
e5a389a1 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
9a0ddd09
AH
20 */
21
22#include "avformat.h"
23#include "voc.h"
24
25typedef struct {
26 uint16_t index;
27 uint8_t length;
28 uint8_t frames;
29} C93BlockRecord;
30
31typedef struct {
32 voc_dec_context_t voc;
33
34 C93BlockRecord block_records[512];
35 int current_block;
36
37 uint32_t frame_offsets[32];
38 int current_frame;
39 int next_pkt_is_audio;
40
41 AVStream *audio;
42} C93DemuxContext;
43
f118d254 44static int probe(AVProbeData *p)
9a0ddd09 45{
9a0ddd09
AH
46 if (p->buf[0] == 0x01 && p->buf[1] == 0x00 &&
47 p->buf[4] == 0x01 + p->buf[2] &&
48 p->buf[8] == p->buf[4] + p->buf[6] &&
49 p->buf[12] == p->buf[8] + p->buf[10])
50 return AVPROBE_SCORE_MAX;
51
52 return 0;
53}
54
f118d254 55static int read_header(AVFormatContext *s,
9a0ddd09
AH
56 AVFormatParameters *ap)
57{
58 AVStream *video;
59 ByteIOContext *pb = &s->pb;
60 C93DemuxContext *c93 = s->priv_data;
61 int i;
62 int framecount = 0;
63
64 for (i = 0; i < 512; i++) {
65 c93->block_records[i].index = get_le16(pb);
66 c93->block_records[i].length = get_byte(pb);
67 c93->block_records[i].frames = get_byte(pb);
68 if (c93->block_records[i].frames > 32) {
69 av_log(s, AV_LOG_ERROR, "too many frames in block\n");
70 return AVERROR_INVALIDDATA;
71 }
72 framecount += c93->block_records[i].frames;
73 }
74
75 /* Audio streams are added if audio packets are found */
76 s->ctx_flags |= AVFMTCTX_NOHEADER;
77
78 video = av_new_stream(s, 0);
79 if (!video)
769e10f0 80 return AVERROR(ENOMEM);
9a0ddd09
AH
81
82 video->codec->codec_type = CODEC_TYPE_VIDEO;
83 video->codec->codec_id = CODEC_ID_C93;
84 video->codec->width = 320;
85 video->codec->height = 192;
86 /* 4:3 320x200 with 8 empty lines */
87 video->codec->sample_aspect_ratio = (AVRational) { 5, 6 };
88 video->time_base = (AVRational) { 2, 25 };
89 video->nb_frames = framecount;
90 video->duration = framecount;
91 video->start_time = 0;
92
93 c93->current_block = 0;
94 c93->current_frame = 0;
95 c93->next_pkt_is_audio = 0;
96 return 0;
97}
98
99#define C93_HAS_PALETTE 0x01
100#define C93_FIRST_FRAME 0x02
101
f118d254 102static int read_packet(AVFormatContext *s, AVPacket *pkt)
9a0ddd09
AH
103{
104 ByteIOContext *pb = &s->pb;
105 C93DemuxContext *c93 = s->priv_data;
106 C93BlockRecord *br = &c93->block_records[c93->current_block];
107 int datasize;
108 int ret, i;
109
110 if (c93->next_pkt_is_audio) {
111 c93->current_frame++;
112 c93->next_pkt_is_audio = 0;
113 datasize = get_le16(pb);
114 if (datasize > 42) {
115 if (!c93->audio) {
116 c93->audio = av_new_stream(s, 1);
117 if (!c93->audio)
769e10f0 118 return AVERROR(ENOMEM);
9a0ddd09
AH
119 c93->audio->codec->codec_type = CODEC_TYPE_AUDIO;
120 }
121 url_fskip(pb, 26); /* VOC header */
122 ret = voc_get_packet(s, pkt, c93->audio, datasize - 26);
123 if (ret > 0) {
124 pkt->stream_index = 1;
125 pkt->flags |= PKT_FLAG_KEY;
126 return ret;
127 }
128 }
129 }
130 if (c93->current_frame >= br->frames) {
131 if (c93->current_block >= 511 || !br[1].length)
6f3e0b21 132 return AVERROR(EIO);
9a0ddd09
AH
133 br++;
134 c93->current_block++;
135 c93->current_frame = 0;
136 }
137
138 if (c93->current_frame == 0) {
139 url_fseek(pb, br->index * 2048, SEEK_SET);
140 for (i = 0; i < 32; i++) {
141 c93->frame_offsets[i] = get_le32(pb);
142 }
143 }
144
145 url_fseek(pb,br->index * 2048 +
146 c93->frame_offsets[c93->current_frame], SEEK_SET);
147 datasize = get_le16(pb); /* video frame size */
148
149 ret = av_new_packet(pkt, datasize + 768 + 1);
150 if (ret < 0)
151 return ret;
152 pkt->data[0] = 0;
153 pkt->size = datasize + 1;
154
155 ret = get_buffer(pb, pkt->data + 1, datasize);
156 if (ret < datasize) {
6f3e0b21 157 ret = AVERROR(EIO);
9a0ddd09
AH
158 goto fail;
159 }
160
161 datasize = get_le16(pb); /* palette size */
162 if (datasize) {
163 if (datasize != 768) {
164 av_log(s, AV_LOG_ERROR, "invalid palette size %u\n", datasize);
165 ret = AVERROR_INVALIDDATA;
166 goto fail;
167 }
168 pkt->data[0] |= C93_HAS_PALETTE;
169 ret = get_buffer(pb, pkt->data + pkt->size, datasize);
170 if (ret < datasize) {
6f3e0b21 171 ret = AVERROR(EIO);
9a0ddd09
AH
172 goto fail;
173 }
174 pkt->size += 768;
175 }
176 pkt->stream_index = 0;
177 c93->next_pkt_is_audio = 1;
178
179 /* only the first frame is guaranteed to not reference previous frames */
180 if (c93->current_block == 0 && c93->current_frame == 0) {
181 pkt->flags |= PKT_FLAG_KEY;
182 pkt->data[0] |= C93_FIRST_FRAME;
183 }
184 return 0;
185
186 fail:
187 av_free_packet(pkt);
188 return ret;
189}
190
191AVInputFormat c93_demuxer = {
192 "c93",
193 "Interplay C93",
194 sizeof(C93DemuxContext),
f118d254
MN
195 probe,
196 read_header,
197 read_packet,
9a0ddd09 198};