233 lines
7 KiB
C
Executable file
233 lines
7 KiB
C
Executable file
/*
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* AVS demuxer.
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* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Argonaut Games' Creature Shock demuxer
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* @see http://wiki.multimedia.cx/index.php?title=AVS
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*/
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#include "avformat.h"
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#include "voc.h"
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typedef struct avs_format {
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VocDecContext voc;
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AVStream *st_video;
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AVStream *st_audio;
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int width;
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int height;
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int bits_per_sample;
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int fps;
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int nb_frames;
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int remaining_frame_size;
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int remaining_audio_size;
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} AvsFormat;
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typedef enum avs_block_type {
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AVS_NONE = 0x00,
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AVS_VIDEO = 0x01,
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AVS_AUDIO = 0x02,
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AVS_PALETTE = 0x03,
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AVS_GAME_DATA = 0x04,
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} AvsBlockType;
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static int avs_probe(const AVProbeData * p)
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{
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const uint8_t *d;
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d = p->buf;
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if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
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/* Ensure the buffer probe scores higher than the extension probe.
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* This avoids problems with misdetection as AviSynth scripts. */
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return AVPROBE_SCORE_EXTENSION + 5;
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return 0;
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}
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static int avs_read_header(AVFormatContext * s)
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{
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AvsFormat *avs = s->priv_data;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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avio_skip(s->pb, 4);
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avs->width = avio_rl16(s->pb);
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avs->height = avio_rl16(s->pb);
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avs->bits_per_sample = avio_rl16(s->pb);
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avs->fps = avio_rl16(s->pb);
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avs->nb_frames = avio_rl32(s->pb);
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avs->remaining_frame_size = 0;
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avs->remaining_audio_size = 0;
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avs->st_video = avs->st_audio = NULL;
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if (avs->width != 318 || avs->height != 198)
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av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
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"when the avs format is supposed to be 318x198 only.\n",
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avs->width, avs->height);
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return 0;
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}
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static int
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avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
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AvsBlockType type, int sub_type, int size,
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uint8_t * palette, int palette_size)
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{
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AvsFormat *avs = s->priv_data;
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int ret;
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ret = av_new_packet(pkt, size + palette_size);
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if (ret < 0)
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return ret;
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if (palette_size) {
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pkt->data[0] = 0x00;
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pkt->data[1] = 0x03;
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pkt->data[2] = palette_size & 0xFF;
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pkt->data[3] = (palette_size >> 8) & 0xFF;
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memcpy(pkt->data + 4, palette, palette_size - 4);
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}
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pkt->data[palette_size + 0] = sub_type;
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pkt->data[palette_size + 1] = type;
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pkt->data[palette_size + 2] = size & 0xFF;
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pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
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ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
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if (ret < size) {
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return AVERROR(EIO);
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}
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pkt->size = ret + palette_size;
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pkt->stream_index = avs->st_video->index;
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if (sub_type == 0)
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pkt->flags |= AV_PKT_FLAG_KEY;
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return 0;
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}
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static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
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{
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AvsFormat *avs = s->priv_data;
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int ret, size;
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size = avio_tell(s->pb);
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ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
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size = avio_tell(s->pb) - size;
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avs->remaining_audio_size -= size;
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if (ret == AVERROR(EIO))
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return 0; /* this indicate EOS */
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if (ret < 0)
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return ret;
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pkt->stream_index = avs->st_audio->index;
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pkt->flags |= AV_PKT_FLAG_KEY;
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return size;
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}
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static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
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{
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AvsFormat *avs = s->priv_data;
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int sub_type = 0, size = 0;
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AvsBlockType type = AVS_NONE;
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int palette_size = 0;
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uint8_t palette[4 + 3 * 256];
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int ret;
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if (avs->remaining_audio_size > 0)
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if (avs_read_audio_packet(s, pkt) > 0)
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return 0;
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while (1) {
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if (avs->remaining_frame_size <= 0) {
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if (!avio_rl16(s->pb)) /* found EOF */
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return AVERROR(EIO);
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avs->remaining_frame_size = avio_rl16(s->pb) - 4;
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}
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while (avs->remaining_frame_size > 0) {
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sub_type = avio_r8(s->pb);
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type = avio_r8(s->pb);
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size = avio_rl16(s->pb);
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if (size < 4)
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return AVERROR_INVALIDDATA;
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avs->remaining_frame_size -= size;
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switch (type) {
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case AVS_PALETTE:
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if (size - 4 > sizeof(palette))
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return AVERROR_INVALIDDATA;
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ret = avio_read(s->pb, palette, size - 4);
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if (ret < size - 4)
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return AVERROR(EIO);
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palette_size = size;
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break;
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case AVS_VIDEO:
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if (!avs->st_video) {
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avs->st_video = avformat_new_stream(s, NULL);
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if (!avs->st_video)
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return AVERROR(ENOMEM);
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avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
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avs->st_video->codecpar->width = avs->width;
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avs->st_video->codecpar->height = avs->height;
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avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
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avs->st_video->nb_frames = avs->nb_frames;
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#if FF_API_R_FRAME_RATE
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avs->st_video->r_frame_rate =
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#endif
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avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
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}
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return avs_read_video_packet(s, pkt, type, sub_type, size,
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palette, palette_size);
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case AVS_AUDIO:
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if (!avs->st_audio) {
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avs->st_audio = avformat_new_stream(s, NULL);
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if (!avs->st_audio)
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return AVERROR(ENOMEM);
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avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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}
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avs->remaining_audio_size = size - 4;
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size = avs_read_audio_packet(s, pkt);
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if (size != 0)
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return size;
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break;
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default:
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avio_skip(s->pb, size - 4);
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}
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}
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}
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}
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AVInputFormat ff_avs_demuxer = {
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.name = "avs",
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.long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
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.priv_data_size = sizeof(AvsFormat),
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.read_probe = avs_probe,
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.read_header = avs_read_header,
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.read_packet = avs_read_packet,
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};
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