/* * 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 */#include "avformat.h"#include "voc.h"typedef struct avs_format {    voc_dec_context_t 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;} avs_format_t;typedef enum avs_block_type {    AVS_NONE      = 0x00,    AVS_VIDEO     = 0x01,    AVS_AUDIO     = 0x02,    AVS_PALETTE   = 0x03,    AVS_GAME_DATA = 0x04,} avs_block_type_t;static int avs_probe(AVProbeData * p){    const uint8_t *d;    d = p->buf;    if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)        return 50;    return 0;}static int avs_read_header(AVFormatContext * s, AVFormatParameters * ap){    avs_format_t *avs = s->priv_data;    s->ctx_flags |= AVFMTCTX_NOHEADER;    url_fskip(s->pb, 4);    avs->width = get_le16(s->pb);    avs->height = get_le16(s->pb);    avs->bits_per_sample = get_le16(s->pb);    avs->fps = get_le16(s->pb);    avs->nb_frames = get_le32(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 intavs_read_video_packet(AVFormatContext * s, AVPacket * pkt,                      avs_block_type_t type, int sub_type, int size,                      uint8_t * palette, int palette_size){    avs_format_t *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 = get_buffer(s->pb, pkt->data + palette_size + 4, size - 4) + 4;    if (ret < size) {        av_free_packet(pkt);        return AVERROR(EIO);    }    pkt->size = ret + palette_size;    pkt->stream_index = avs->st_video->index;    if (sub_type == 0)        pkt->flags |= PKT_FLAG_KEY;    return 0;}static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt){    avs_format_t *avs = s->priv_data;    int ret, size;    size = url_ftell(s->pb);    ret = voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);    size = url_ftell(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 |= PKT_FLAG_KEY;    return size;}static int avs_read_packet(AVFormatContext * s, AVPacket * pkt){    avs_format_t *avs = s->priv_data;    int sub_type = 0, size = 0;    avs_block_type_t 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 (!get_le16(s->pb))    /* found EOF */                return AVERROR(EIO);            avs->remaining_frame_size = get_le16(s->pb) - 4;        }        while (avs->remaining_frame_size > 0) {            sub_type = get_byte(s->pb);            type = get_byte(s->pb);            size = get_le16(s->pb);            avs->remaining_frame_size -= size;            switch (type) {            case AVS_PALETTE:                ret = get_buffer(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 = av_new_stream(s, AVS_VIDEO);                    if (avs->st_video == NULL)                        return AVERROR(ENOMEM);                    avs->st_video->codec->codec_type = CODEC_TYPE_VIDEO;                    avs->st_video->codec->codec_id = CODEC_ID_AVS;                    avs->st_video->codec->width = avs->width;                    avs->st_video->codec->height = avs->height;                    avs->st_video->codec->bits_per_sample=avs->bits_per_sample;                    avs->st_video->nb_frames = avs->nb_frames;                    avs->st_video->codec->time_base = (AVRational) {                    1, avs->fps};                }                return avs_read_video_packet(s, pkt, type, sub_type, size,                                             palette, palette_size);            case AVS_AUDIO:                if (!avs->st_audio) {                    avs->st_audio = av_new_stream(s, AVS_AUDIO);                    if (avs->st_audio == NULL)                        return AVERROR(ENOMEM);                    avs->st_audio->codec->codec_type = CODEC_TYPE_AUDIO;                }                avs->remaining_audio_size = size - 4;                size = avs_read_audio_packet(s, pkt);                if (size != 0)                    return size;                break;            default:                url_fskip(s->pb, size - 4);            }        }    }}static int avs_read_close(AVFormatContext * s){    return 0;}AVInputFormat avs_demuxer = {    "avs",    NULL_IF_CONFIG_SMALL("AVS format"),    sizeof(avs_format_t),    avs_probe,    avs_read_header,    avs_read_packet,    avs_read_close,};