/libavformat/avs.c

  1/*
  2 * AVS demuxer.
  3 * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
  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 * Argonaut Games' Creature Shock demuxer
 25 * @see http://wiki.multimedia.cx/index.php?title=AVS
 26 */
 27
 28#include "avformat.h"
 29#include "voc.h"
 30
 31
 32typedef struct avs_format {
 33    VocDecContext voc;
 34    AVStream *st_video;
 35    AVStream *st_audio;
 36    int width;
 37    int height;
 38    int bits_per_sample;
 39    int fps;
 40    int nb_frames;
 41    int remaining_frame_size;
 42    int remaining_audio_size;
 43} AvsFormat;
 44
 45typedef enum avs_block_type {
 46    AVS_NONE      = 0x00,
 47    AVS_VIDEO     = 0x01,
 48    AVS_AUDIO     = 0x02,
 49    AVS_PALETTE   = 0x03,
 50    AVS_GAME_DATA = 0x04,
 51} AvsBlockType;
 52
 53static int avs_probe(const AVProbeData * p)
 54{
 55    const uint8_t *d;
 56
 57    d = p->buf;
 58    if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
 59        /* Ensure the buffer probe scores higher than the extension probe.
 60         * This avoids problems with misdetection as AviSynth scripts. */
 61        return AVPROBE_SCORE_EXTENSION + 5;
 62
 63    return 0;
 64}
 65
 66static int avs_read_header(AVFormatContext * s)
 67{
 68    AvsFormat *avs = s->priv_data;
 69
 70    s->ctx_flags |= AVFMTCTX_NOHEADER;
 71
 72    avio_skip(s->pb, 4);
 73    avs->width = avio_rl16(s->pb);
 74    avs->height = avio_rl16(s->pb);
 75    avs->bits_per_sample = avio_rl16(s->pb);
 76    avs->fps = avio_rl16(s->pb);
 77    avs->nb_frames = avio_rl32(s->pb);
 78    avs->remaining_frame_size = 0;
 79    avs->remaining_audio_size = 0;
 80
 81    avs->st_video = avs->st_audio = NULL;
 82
 83    if (avs->width != 318 || avs->height != 198)
 84        av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
 85               "when the avs format is supposed to be 318x198 only.\n",
 86               avs->width, avs->height);
 87
 88    return 0;
 89}
 90
 91static int
 92avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
 93                      AvsBlockType type, int sub_type, int size,
 94                      uint8_t * palette, int palette_size)
 95{
 96    AvsFormat *avs = s->priv_data;
 97    int ret;
 98
 99    ret = av_new_packet(pkt, size + palette_size);
100    if (ret < 0)
101        return ret;
102
103    if (palette_size) {
104        pkt->data[0] = 0x00;
105        pkt->data[1] = 0x03;
106        pkt->data[2] = palette_size & 0xFF;
107        pkt->data[3] = (palette_size >> 8) & 0xFF;
108        memcpy(pkt->data + 4, palette, palette_size - 4);
109    }
110
111    pkt->data[palette_size + 0] = sub_type;
112    pkt->data[palette_size + 1] = type;
113    pkt->data[palette_size + 2] = size & 0xFF;
114    pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
115    ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
116    if (ret < size) {
117        return AVERROR(EIO);
118    }
119
120    pkt->size = ret + palette_size;
121    pkt->stream_index = avs->st_video->index;
122    if (sub_type == 0)
123        pkt->flags |= AV_PKT_FLAG_KEY;
124
125    return 0;
126}
127
128static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
129{
130    AvsFormat *avs = s->priv_data;
131    int ret, size;
132
133    size = avio_tell(s->pb);
134    ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
135    size = avio_tell(s->pb) - size;
136    avs->remaining_audio_size -= size;
137
138    if (ret == AVERROR(EIO))
139        return 0;    /* this indicate EOS */
140    if (ret < 0)
141        return ret;
142
143    pkt->stream_index = avs->st_audio->index;
144    pkt->flags |= AV_PKT_FLAG_KEY;
145
146    return size;
147}
148
149static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
150{
151    AvsFormat *avs = s->priv_data;
152    int sub_type = 0, size = 0;
153    AvsBlockType type = AVS_NONE;
154    int palette_size = 0;
155    uint8_t palette[4 + 3 * 256];
156    int ret;
157
158    if (avs->remaining_audio_size > 0)
159        if (avs_read_audio_packet(s, pkt) > 0)
160            return 0;
161
162    while (1) {
163        if (avs->remaining_frame_size <= 0) {
164            if (!avio_rl16(s->pb))    /* found EOF */
165                return AVERROR(EIO);
166            avs->remaining_frame_size = avio_rl16(s->pb) - 4;
167        }
168
169        while (avs->remaining_frame_size > 0) {
170            sub_type = avio_r8(s->pb);
171            type = avio_r8(s->pb);
172            size = avio_rl16(s->pb);
173            if (size < 4)
174                return AVERROR_INVALIDDATA;
175            avs->remaining_frame_size -= size;
176
177            switch (type) {
178            case AVS_PALETTE:
179                if (size - 4 > sizeof(palette))
180                    return AVERROR_INVALIDDATA;
181                ret = avio_read(s->pb, palette, size - 4);
182                if (ret < size - 4)
183                    return AVERROR(EIO);
184                palette_size = size;
185                break;
186
187            case AVS_VIDEO:
188                if (!avs->st_video) {
189                    avs->st_video = avformat_new_stream(s, NULL);
190                    if (!avs->st_video)
191                        return AVERROR(ENOMEM);
192                    avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
193                    avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
194                    avs->st_video->codecpar->width = avs->width;
195                    avs->st_video->codecpar->height = avs->height;
196                    avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
197                    avs->st_video->nb_frames = avs->nb_frames;
198#if FF_API_R_FRAME_RATE
199                    avs->st_video->r_frame_rate =
200#endif
201                    avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
202                }
203                return avs_read_video_packet(s, pkt, type, sub_type, size,
204                                             palette, palette_size);
205
206            case AVS_AUDIO:
207                if (!avs->st_audio) {
208                    avs->st_audio = avformat_new_stream(s, NULL);
209                    if (!avs->st_audio)
210                        return AVERROR(ENOMEM);
211                    avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
212                }
213                avs->remaining_audio_size = size - 4;
214                size = avs_read_audio_packet(s, pkt);
215                if (size != 0)
216                    return size;
217                break;
218
219            default:
220                avio_skip(s->pb, size - 4);
221            }
222        }
223    }
224}
225
226AVInputFormat ff_avs_demuxer = {
227    .name           = "avs",
228    .long_name      = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
229    .priv_data_size = sizeof(AvsFormat),
230    .read_probe     = avs_probe,
231    .read_header    = avs_read_header,
232    .read_packet    = avs_read_packet,
233};