yading@11: /*
yading@11:  * AVS demuxer.
yading@11:  * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "voc.h"
yading@11: 
yading@11: 
yading@11: typedef struct avs_format {
yading@11:     VocDecContext voc;
yading@11:     AVStream *st_video;
yading@11:     AVStream *st_audio;
yading@11:     int width;
yading@11:     int height;
yading@11:     int bits_per_sample;
yading@11:     int fps;
yading@11:     int nb_frames;
yading@11:     int remaining_frame_size;
yading@11:     int remaining_audio_size;
yading@11: } AvsFormat;
yading@11: 
yading@11: typedef enum avs_block_type {
yading@11:     AVS_NONE      = 0x00,
yading@11:     AVS_VIDEO     = 0x01,
yading@11:     AVS_AUDIO     = 0x02,
yading@11:     AVS_PALETTE   = 0x03,
yading@11:     AVS_GAME_DATA = 0x04,
yading@11: } AvsBlockType;
yading@11: 
yading@11: static int avs_probe(AVProbeData * p)
yading@11: {
yading@11:     const uint8_t *d;
yading@11: 
yading@11:     d = p->buf;
yading@11:     if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0)
yading@11:         return 55;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int avs_read_header(AVFormatContext * s)
yading@11: {
yading@11:     AvsFormat *avs = s->priv_data;
yading@11: 
yading@11:     s->ctx_flags |= AVFMTCTX_NOHEADER;
yading@11: 
yading@11:     avio_skip(s->pb, 4);
yading@11:     avs->width = avio_rl16(s->pb);
yading@11:     avs->height = avio_rl16(s->pb);
yading@11:     avs->bits_per_sample = avio_rl16(s->pb);
yading@11:     avs->fps = avio_rl16(s->pb);
yading@11:     avs->nb_frames = avio_rl32(s->pb);
yading@11:     avs->remaining_frame_size = 0;
yading@11:     avs->remaining_audio_size = 0;
yading@11: 
yading@11:     avs->st_video = avs->st_audio = NULL;
yading@11: 
yading@11:     if (avs->width != 318 || avs->height != 198)
yading@11:         av_log(s, AV_LOG_ERROR, "This avs pretend to be %dx%d "
yading@11:                "when the avs format is supposed to be 318x198 only.\n",
yading@11:                avs->width, avs->height);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int
yading@11: avs_read_video_packet(AVFormatContext * s, AVPacket * pkt,
yading@11:                       AvsBlockType type, int sub_type, int size,
yading@11:                       uint8_t * palette, int palette_size)
yading@11: {
yading@11:     AvsFormat *avs = s->priv_data;
yading@11:     int ret;
yading@11: 
yading@11:     ret = av_new_packet(pkt, size + palette_size);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     if (palette_size) {
yading@11:         pkt->data[0] = 0x00;
yading@11:         pkt->data[1] = 0x03;
yading@11:         pkt->data[2] = palette_size & 0xFF;
yading@11:         pkt->data[3] = (palette_size >> 8) & 0xFF;
yading@11:         memcpy(pkt->data + 4, palette, palette_size - 4);
yading@11:     }
yading@11: 
yading@11:     pkt->data[palette_size + 0] = sub_type;
yading@11:     pkt->data[palette_size + 1] = type;
yading@11:     pkt->data[palette_size + 2] = size & 0xFF;
yading@11:     pkt->data[palette_size + 3] = (size >> 8) & 0xFF;
yading@11:     ret = avio_read(s->pb, pkt->data + palette_size + 4, size - 4) + 4;
yading@11:     if (ret < size) {
yading@11:         av_free_packet(pkt);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     pkt->size = ret + palette_size;
yading@11:     pkt->stream_index = avs->st_video->index;
yading@11:     if (sub_type == 0)
yading@11:         pkt->flags |= AV_PKT_FLAG_KEY;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int avs_read_audio_packet(AVFormatContext * s, AVPacket * pkt)
yading@11: {
yading@11:     AvsFormat *avs = s->priv_data;
yading@11:     int ret, size;
yading@11: 
yading@11:     size = avio_tell(s->pb);
yading@11:     ret = ff_voc_get_packet(s, pkt, avs->st_audio, avs->remaining_audio_size);
yading@11:     size = avio_tell(s->pb) - size;
yading@11:     avs->remaining_audio_size -= size;
yading@11: 
yading@11:     if (ret == AVERROR(EIO))
yading@11:         return 0;    /* this indicate EOS */
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11: 
yading@11:     pkt->stream_index = avs->st_audio->index;
yading@11:     pkt->flags |= AV_PKT_FLAG_KEY;
yading@11: 
yading@11:     return size;
yading@11: }
yading@11: 
yading@11: static int avs_read_packet(AVFormatContext * s, AVPacket * pkt)
yading@11: {
yading@11:     AvsFormat *avs = s->priv_data;
yading@11:     int sub_type = 0, size = 0;
yading@11:     AvsBlockType type = AVS_NONE;
yading@11:     int palette_size = 0;
yading@11:     uint8_t palette[4 + 3 * 256];
yading@11:     int ret;
yading@11: 
yading@11:     if (avs->remaining_audio_size > 0)
yading@11:         if (avs_read_audio_packet(s, pkt) > 0)
yading@11:             return 0;
yading@11: 
yading@11:     while (1) {
yading@11:         if (avs->remaining_frame_size <= 0) {
yading@11:             if (!avio_rl16(s->pb))    /* found EOF */
yading@11:                 return AVERROR(EIO);
yading@11:             avs->remaining_frame_size = avio_rl16(s->pb) - 4;
yading@11:         }
yading@11: 
yading@11:         while (avs->remaining_frame_size > 0) {
yading@11:             sub_type = avio_r8(s->pb);
yading@11:             type = avio_r8(s->pb);
yading@11:             size = avio_rl16(s->pb);
yading@11:             if (size < 4)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             avs->remaining_frame_size -= size;
yading@11: 
yading@11:             switch (type) {
yading@11:             case AVS_PALETTE:
yading@11:                 if (size - 4 > sizeof(palette))
yading@11:                     return AVERROR_INVALIDDATA;
yading@11:                 ret = avio_read(s->pb, palette, size - 4);
yading@11:                 if (ret < size - 4)
yading@11:                     return AVERROR(EIO);
yading@11:                 palette_size = size;
yading@11:                 break;
yading@11: 
yading@11:             case AVS_VIDEO:
yading@11:                 if (!avs->st_video) {
yading@11:                     avs->st_video = avformat_new_stream(s, NULL);
yading@11:                     if (avs->st_video == NULL)
yading@11:                         return AVERROR(ENOMEM);
yading@11:                     avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:                     avs->st_video->codec->codec_id = AV_CODEC_ID_AVS;
yading@11:                     avs->st_video->codec->width = avs->width;
yading@11:                     avs->st_video->codec->height = avs->height;
yading@11:                     avs->st_video->codec->bits_per_coded_sample=avs->bits_per_sample;
yading@11:                     avs->st_video->nb_frames = avs->nb_frames;
yading@11: #if FF_API_R_FRAME_RATE
yading@11:                     avs->st_video->r_frame_rate =
yading@11: #endif
yading@11:                     avs->st_video->avg_frame_rate = (AVRational){avs->fps, 1};
yading@11:                 }
yading@11:                 return avs_read_video_packet(s, pkt, type, sub_type, size,
yading@11:                                              palette, palette_size);
yading@11: 
yading@11:             case AVS_AUDIO:
yading@11:                 if (!avs->st_audio) {
yading@11:                     avs->st_audio = avformat_new_stream(s, NULL);
yading@11:                     if (avs->st_audio == NULL)
yading@11:                         return AVERROR(ENOMEM);
yading@11:                     avs->st_audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:                 }
yading@11:                 avs->remaining_audio_size = size - 4;
yading@11:                 size = avs_read_audio_packet(s, pkt);
yading@11:                 if (size != 0)
yading@11:                     return size;
yading@11:                 break;
yading@11: 
yading@11:             default:
yading@11:                 avio_skip(s->pb, size - 4);
yading@11:             }
yading@11:         }
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int avs_read_close(AVFormatContext * s)
yading@11: {
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_avs_demuxer = {
yading@11:     .name           = "avs",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("AVS"),
yading@11:     .priv_data_size = sizeof(AvsFormat),
yading@11:     .read_probe     = avs_probe,
yading@11:     .read_header    = avs_read_header,
yading@11:     .read_packet    = avs_read_packet,
yading@11:     .read_close     = avs_read_close,
yading@11: };