3 * Copyright (c) 2011-2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/parseutils.h"
25 #include "libavutil/opt.h"
29 #define CDXL_HEADER_SIZE 32
31 typedef struct CDXLDemuxContext {
37 uint8_t header[CDXL_HEADER_SIZE];
38 int video_stream_index;
39 int audio_stream_index;
42 static int cdxl_read_probe(AVProbeData *p)
44 int score = AVPROBE_SCORE_MAX / 2 + 10;
46 if (p->buf_size < CDXL_HEADER_SIZE)
49 /* reserved bytes should always be set to 0 */
50 if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10]))
57 /* check palette size */
58 if (AV_RB16(&p->buf[20]) > 512)
61 /* check number of planes */
62 if (p->buf[18] || !p->buf[19])
65 /* check widh and height */
66 if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16]))
70 if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE)
73 /* previous chunk size */
74 if (AV_RN32(&p->buf[6]))
77 /* current frame number, usually starts from 1 */
78 if (AV_RB16(&p->buf[12]) != 1)
84 static int cdxl_read_header(AVFormatContext *s)
86 CDXLDemuxContext *cdxl = s->priv_data;
89 if (cdxl->framerate && (ret = av_parse_video_rate(&cdxl->fps, cdxl->framerate)) < 0) {
90 av_log(s, AV_LOG_ERROR,
91 "Could not parse framerate: %s.\n", cdxl->framerate);
96 cdxl->video_stream_index = -1;
97 cdxl->audio_stream_index = -1;
99 s->ctx_flags |= AVFMTCTX_NOHEADER;
104 static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
106 CDXLDemuxContext *cdxl = s->priv_data;
107 AVIOContext *pb = s->pb;
108 uint32_t current_size, video_size, image_size;
109 uint16_t audio_size, palette_size, width, height;
117 if (!cdxl->read_chunk &&
118 avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
120 if (cdxl->header[0] != 1) {
121 av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n");
122 return AVERROR_INVALIDDATA;
125 current_size = AV_RB32(&cdxl->header[2]);
126 width = AV_RB16(&cdxl->header[14]);
127 height = AV_RB16(&cdxl->header[16]);
128 palette_size = AV_RB16(&cdxl->header[20]);
129 audio_size = AV_RB16(&cdxl->header[22]);
130 image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
131 video_size = palette_size + image_size;
133 if (palette_size > 512)
134 return AVERROR_INVALIDDATA;
135 if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
136 return AVERROR_INVALIDDATA;
138 if (cdxl->read_chunk && audio_size) {
139 if (cdxl->audio_stream_index == -1) {
140 AVStream *st = avformat_new_stream(s, NULL);
142 return AVERROR(ENOMEM);
144 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
145 st->codec->codec_tag = 0;
146 st->codec->codec_id = AV_CODEC_ID_PCM_S8;
147 if (cdxl->header[1] & 0x10) {
148 st->codec->channels = 2;
149 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
151 st->codec->channels = 1;
152 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
154 st->codec->sample_rate = cdxl->sample_rate;
156 cdxl->audio_stream_index = st->index;
157 avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
160 ret = av_get_packet(pb, pkt, audio_size);
163 pkt->stream_index = cdxl->audio_stream_index;
165 pkt->duration = audio_size;
166 cdxl->read_chunk = 0;
168 if (cdxl->video_stream_index == -1) {
169 AVStream *st = avformat_new_stream(s, NULL);
171 return AVERROR(ENOMEM);
173 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
174 st->codec->codec_tag = 0;
175 st->codec->codec_id = AV_CODEC_ID_CDXL;
176 st->codec->width = width;
177 st->codec->height = height;
179 cdxl->video_stream_index = st->index;
181 avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num);
183 avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate);
186 if (av_new_packet(pkt, video_size + CDXL_HEADER_SIZE) < 0)
187 return AVERROR(ENOMEM);
188 memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
189 ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
194 av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret);
195 pkt->stream_index = cdxl->video_stream_index;
196 pkt->flags |= AV_PKT_FLAG_KEY;
198 pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220;
199 cdxl->read_chunk = audio_size;
202 if (!cdxl->read_chunk)
203 avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
207 #define OFFSET(x) offsetof(CDXLDemuxContext, x)
208 static const AVOption cdxl_options[] = {
209 { "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64 = 11025 }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
210 { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
214 static const AVClass cdxl_demuxer_class = {
215 .class_name = "CDXL demuxer",
216 .item_name = av_default_item_name,
217 .option = cdxl_options,
218 .version = LIBAVUTIL_VERSION_INT,
221 AVInputFormat ff_cdxl_demuxer = {
223 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
224 .priv_data_size = sizeof(CDXLDemuxContext),
225 .read_probe = cdxl_read_probe,
226 .read_header = cdxl_read_header,
227 .read_packet = cdxl_read_packet,
228 .extensions = "cdxl,xl",
229 .flags = AVFMT_GENERIC_INDEX,
230 .priv_class = &cdxl_demuxer_class,