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FFmpeg/libavformat/avs.c

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/*
* AVS demuxer.
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Argonaut Games' Creature Shock demuxer
* @see http://wiki.multimedia.cx/index.php?title=AVS
*/
#include "avformat.h"
#include "voc.h"
typedef struct avs_format {
VocDecContext voc;
AVStream *st_video;
AVStream *st_audio;
int width;
int height;
int bits_per_sample;
int fps;
int nb_frames;
int remaining_frame_size;
int remaining_audio_size;
} AvsFormat;
typedef enum avs_block_type {
AVS_NONE = 0x00,
AVS_VIDEO = 0x01,
AVS_AUDIO = 0x02,
AVS_PALETTE = 0x03,
AVS_GAME_DATA = 0x04,
} AvsBlockType;
static int avs_probe(const AVProbeData * p)
{
const uint8_t *d;
d = p->buf;
if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
/* Ensure the buffer probe scores higher than the extension probe.
* This avoids problems with misdetection as AviSynth scripts. */
return AVPROBE_SCORE_EXTENSION + 5;
return 0;
}
static int avs_read_header(AVFormatContext * s)
{
AvsFormat *avs = s->priv_data;
s->ctx_flags |= AVFMTCTX_NOHEADER;
avio_skip(s->pb, 4);
avs->width = avio_rl16(s->pb);
avs->height = avio_rl16(s->pb);
avs->bits_per_sample = avio_rl16(s->pb);
avs->fps = avio_rl16(s->pb);
avs->nb_frames = avio_rl32(s->pb);
avs->remaining_frame_size = 0;
avs->remaining_audio_size = 0;
avs->st_video = avs->st_audio = NULL;
if (avs->width != 318 || avs->height != 198)
av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
"when the avs format is supposed to be 318x198 only.\n",
avs->width, avs->height);
return 0;
}
static int
avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
AvsBlockType type, int sub_type, int size,
uint8_t * palette, int palette_size)
{
AvsFormat *avs = s->priv_data;
int ret;
ret = av_new_packet(pkt, size + palette_size);
if (ret < 0)
return ret;
if (palette_size) {
pkt->data[0] = 0x00;
pkt->data[1] = 0x03;
pkt->data[2] = palette_size & 0xFF;
pkt->data[3] = (palette_size >> 8) & 0xFF;
memcpy(pkt->data + 4, palette, palette_size - 4);
}
pkt->data[palette_size + 0] = sub_type;
pkt->data[palette_size + 1] = type;
pkt->data[palette_size + 2] = size & 0xFF;
pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
if (ret < size) {
av_packet_unref(pkt);
return AVERROR(EIO);
}
pkt->size = ret + palette_size;
pkt->stream_index = avs->st_video->index;
if (sub_type == 0)
pkt->flags |= AV_PKT_FLAG_KEY;
return 0;
}
static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
{
AvsFormat *avs = s->priv_data;
int ret, size;
size = avio_tell(s->pb);
ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
size = avio_tell(s->pb) - size;
avs->remaining_audio_size -= size;
if (ret == AVERROR(EIO))
return 0; /* this indicate EOS */
if (ret < 0)
return ret;
pkt->stream_index = avs->st_audio->index;
pkt->flags |= AV_PKT_FLAG_KEY;
return size;
}
static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
{
AvsFormat *avs = s->priv_data;
int sub_type = 0, size = 0;
AvsBlockType type = AVS_NONE;
int palette_size = 0;
uint8_t palette[4 + 3 * 256];
int ret;
if (avs->remaining_audio_size > 0)
if (avs_read_audio_packet(s, pkt) > 0)
return 0;
while (1) {
if (avs->remaining_frame_size <= 0) {
if (!avio_rl16(s->pb)) /* found EOF */
return AVERROR(EIO);
avs->remaining_frame_size = avio_rl16(s->pb) - 4;
}
while (avs->remaining_frame_size > 0) {
sub_type = avio_r8(s->pb);
type = avio_r8(s->pb);
size = avio_rl16(s->pb);
if (size < 4)
return AVERROR_INVALIDDATA;
avs->remaining_frame_size -= size;
switch (type) {
case AVS_PALETTE:
if (size - 4 > sizeof(palette))
return AVERROR_INVALIDDATA;
ret = avio_read(s->pb, palette, size - 4);
if (ret < size - 4)
return AVERROR(EIO);
palette_size = size;
break;
case AVS_VIDEO:
if (!avs->st_video) {
avs->st_video = avformat_new_stream(s, NULL);
if (!avs->st_video)
return AVERROR(ENOMEM);
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
avs->st_video->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
avs->st_video->codecpar->codec_id = AV_CODEC_ID_AVS;
avs->st_video->codecpar->width = avs->width;
avs->st_video->codecpar->height = avs->height;
avs->st_video->codecpar->bits_per_coded_sample=avs->bits_per_sample;
avs->st_video->nb_frames = avs->nb_frames;
#if FF_API_R_FRAME_RATE
avs->st_video->r_frame_rate =
#endif
avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
}
return avs_read_video_packet(s, pkt, type, sub_type, size,
palette, palette_size);
case AVS_AUDIO:
if (!avs->st_audio) {
avs->st_audio = avformat_new_stream(s, NULL);
if (!avs->st_audio)
return AVERROR(ENOMEM);
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
avs->st_audio->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
}
avs->remaining_audio_size = size - 4;
size = avs_read_audio_packet(s, pkt);
if (size != 0)
return size;
break;
default:
avio_skip(s->pb, size - 4);
}
}
}
}
static int avs_read_close(AVFormatContext * s)
{
return 0;
}
AVInputFormat ff_avs_demuxer = {
.name = "avs",
.long_name = NULL_IF_CONFIG_SMALL("Argonaut Games Creature Shock"),
.priv_data_size = sizeof(AvsFormat),
.read_probe = avs_probe,
.read_header = avs_read_header,
.read_packet = avs_read_packet,
.read_close = avs_read_close,
};