1/*
2 * NuppelVideo demuxer.
3 * Copyright (c) 2006 Reimar Doeffinger
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#include "libavutil/intreadwrite.h"
23#include "avformat.h"
24#include "riff.h"
25
26typedef struct {
27    int v_id;
28    int a_id;
29    int rtjpg_video;
30} NUVContext;
31
32typedef enum {
33    NUV_VIDEO = 'V',
34    NUV_EXTRADATA = 'D',
35    NUV_AUDIO = 'A',
36    NUV_SEEKP = 'R',
37    NUV_MYTHEXT = 'X'
38} nuv_frametype;
39
40static int nuv_probe(AVProbeData *p) {
41    if (!memcmp(p->buf, "NuppelVideo", 12))
42        return AVPROBE_SCORE_MAX;
43    if (!memcmp(p->buf, "MythTVVideo", 12))
44        return AVPROBE_SCORE_MAX;
45    return 0;
46}
47
48//! little macro to sanitize packet size
49#define PKTSIZE(s) (s &  0xffffff)
50
51/**
52 * \brief read until we found all data needed for decoding
53 * \param vst video stream of which to change parameters
54 * \param ast video stream of which to change parameters
55 * \param myth set if this is a MythTVVideo format file
56 * \return 1 if all required codec data was found
57 */
58static int get_codec_data(ByteIOContext *pb, AVStream *vst,
59                          AVStream *ast, int myth) {
60    nuv_frametype frametype;
61    if (!vst && !myth)
62        return 1; // no codec data needed
63    while (!url_feof(pb)) {
64        int size, subtype;
65        frametype = get_byte(pb);
66        switch (frametype) {
67            case NUV_EXTRADATA:
68                subtype = get_byte(pb);
69                url_fskip(pb, 6);
70                size = PKTSIZE(get_le32(pb));
71                if (vst && subtype == 'R') {
72                    vst->codec->extradata_size = size;
73                    vst->codec->extradata = av_malloc(size);
74                    get_buffer(pb, vst->codec->extradata, size);
75                    size = 0;
76                    if (!myth)
77                        return 1;
78                }
79                break;
80            case NUV_MYTHEXT:
81                url_fskip(pb, 7);
82                size = PKTSIZE(get_le32(pb));
83                if (size != 128 * 4)
84                    break;
85                get_le32(pb); // version
86                if (vst) {
87                    vst->codec->codec_tag = get_le32(pb);
88                    vst->codec->codec_id =
89                        ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
90                    if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
91                        vst->codec->codec_id = CODEC_ID_NUV;
92                } else
93                    url_fskip(pb, 4);
94
95                if (ast) {
96                    ast->codec->codec_tag = get_le32(pb);
97                    ast->codec->sample_rate = get_le32(pb);
98                    ast->codec->bits_per_coded_sample = get_le32(pb);
99                    ast->codec->channels = get_le32(pb);
100                    ast->codec->codec_id =
101                        ff_wav_codec_get_id(ast->codec->codec_tag,
102                                         ast->codec->bits_per_coded_sample);
103                    ast->need_parsing = AVSTREAM_PARSE_FULL;
104                } else
105                    url_fskip(pb, 4 * 4);
106
107                size -= 6 * 4;
108                url_fskip(pb, size);
109                return 1;
110            case NUV_SEEKP:
111                size = 11;
112                break;
113            default:
114                url_fskip(pb, 7);
115                size = PKTSIZE(get_le32(pb));
116                break;
117        }
118        url_fskip(pb, size);
119    }
120    return 0;
121}
122
123static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) {
124    NUVContext *ctx = s->priv_data;
125    ByteIOContext *pb = s->pb;
126    char id_string[12];
127    double aspect, fps;
128    int is_mythtv, width, height, v_packs, a_packs;
129    int stream_nr = 0;
130    AVStream *vst = NULL, *ast = NULL;
131    get_buffer(pb, id_string, 12);
132    is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
133    url_fskip(pb, 5); // version string
134    url_fskip(pb, 3); // padding
135    width = get_le32(pb);
136    height = get_le32(pb);
137    get_le32(pb); // unused, "desiredwidth"
138    get_le32(pb); // unused, "desiredheight"
139    get_byte(pb); // 'P' == progressive, 'I' == interlaced
140    url_fskip(pb, 3); // padding
141    aspect = av_int2dbl(get_le64(pb));
142    if (aspect > 0.9999 && aspect < 1.0001)
143        aspect = 4.0 / 3.0;
144    fps = av_int2dbl(get_le64(pb));
145
146    // number of packets per stream type, -1 means unknown, e.g. streaming
147    v_packs = get_le32(pb);
148    a_packs = get_le32(pb);
149    get_le32(pb); // text
150
151    get_le32(pb); // keyframe distance (?)
152
153    if (v_packs) {
154        ctx->v_id = stream_nr++;
155        vst = av_new_stream(s, ctx->v_id);
156        if (!vst)
157            return AVERROR(ENOMEM);
158        vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
159        vst->codec->codec_id = CODEC_ID_NUV;
160        vst->codec->width = width;
161        vst->codec->height = height;
162        vst->codec->bits_per_coded_sample = 10;
163        vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000);
164        vst->r_frame_rate = av_d2q(fps, 60000);
165        av_set_pts_info(vst, 32, 1, 1000);
166    } else
167        ctx->v_id = -1;
168
169    if (a_packs) {
170        ctx->a_id = stream_nr++;
171        ast = av_new_stream(s, ctx->a_id);
172        if (!ast)
173            return AVERROR(ENOMEM);
174        ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
175        ast->codec->codec_id = CODEC_ID_PCM_S16LE;
176        ast->codec->channels = 2;
177        ast->codec->sample_rate = 44100;
178        ast->codec->bit_rate = 2 * 2 * 44100 * 8;
179        ast->codec->block_align = 2 * 2;
180        ast->codec->bits_per_coded_sample = 16;
181        av_set_pts_info(ast, 32, 1, 1000);
182    } else
183        ctx->a_id = -1;
184
185    get_codec_data(pb, vst, ast, is_mythtv);
186    ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV;
187    return 0;
188}
189
190#define HDRSIZE 12
191
192static int nuv_packet(AVFormatContext *s, AVPacket *pkt) {
193    NUVContext *ctx = s->priv_data;
194    ByteIOContext *pb = s->pb;
195    uint8_t hdr[HDRSIZE];
196    nuv_frametype frametype;
197    int ret, size;
198    while (!url_feof(pb)) {
199        int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
200        uint64_t pos = url_ftell(pb);
201        ret = get_buffer(pb, hdr, HDRSIZE);
202        if (ret < HDRSIZE)
203            return ret < 0 ? ret : AVERROR(EIO);
204        frametype = hdr[0];
205        size = PKTSIZE(AV_RL32(&hdr[8]));
206        switch (frametype) {
207            case NUV_EXTRADATA:
208                if (!ctx->rtjpg_video) {
209                    url_fskip(pb, size);
210                    break;
211                }
212            case NUV_VIDEO:
213                if (ctx->v_id < 0) {
214                    av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
215                    url_fskip(pb, size);
216                    break;
217                }
218                ret = av_new_packet(pkt, copyhdrsize + size);
219                if (ret < 0)
220                    return ret;
221                // HACK: we have no idea if it is a keyframe,
222                // but if we mark none seeking will not work at all.
223                pkt->flags |= AV_PKT_FLAG_KEY;
224                pkt->pos = pos;
225                pkt->pts = AV_RL32(&hdr[4]);
226                pkt->stream_index = ctx->v_id;
227                memcpy(pkt->data, hdr, copyhdrsize);
228                ret = get_buffer(pb, pkt->data + copyhdrsize, size);
229                if (ret < 0) {
230                    av_free_packet(pkt);
231                    return ret;
232                }
233                if (ret < size)
234                    av_shrink_packet(pkt, copyhdrsize + ret);
235                return 0;
236            case NUV_AUDIO:
237                if (ctx->a_id < 0) {
238                    av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
239                    url_fskip(pb, size);
240                    break;
241                }
242                ret = av_get_packet(pb, pkt, size);
243                pkt->flags |= AV_PKT_FLAG_KEY;
244                pkt->pos = pos;
245                pkt->pts = AV_RL32(&hdr[4]);
246                pkt->stream_index = ctx->a_id;
247                if (ret < 0) return ret;
248                return 0;
249            case NUV_SEEKP:
250                // contains no data, size value is invalid
251                break;
252            default:
253                url_fskip(pb, size);
254                break;
255        }
256    }
257    return AVERROR(EIO);
258}
259
260AVInputFormat nuv_demuxer = {
261    "nuv",
262    NULL_IF_CONFIG_SMALL("NuppelVideo format"),
263    sizeof(NUVContext),
264    nuv_probe,
265    nuv_header,
266    nuv_packet,
267    NULL,
268    NULL,
269    .flags = AVFMT_GENERIC_INDEX,
270};
271