diff options
Diffstat (limited to 'ffmpeg/libavformat/avs.c')
| -rw-r--r-- | ffmpeg/libavformat/avs.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/avs.c b/ffmpeg/libavformat/avs.c new file mode 100644 index 0000000..ec9198b --- /dev/null +++ b/ffmpeg/libavformat/avs.c @@ -0,0 +1,232 @@ +/* + * 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 { + 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(AVProbeData * p) +{ + const uint8_t *d; + + d = p->buf; + if (d[0] == 'w' && d[1] == 'W' && d[2] == 0x10 && d[3] == 0) + return 55; + + 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_free_packet(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 == NULL) + return AVERROR(ENOMEM); + avs->st_video->codec->codec_type = AVMEDIA_TYPE_VIDEO; + avs->st_video->codec->codec_id = AV_CODEC_ID_AVS; + avs->st_video->codec->width = avs->width; + avs->st_video->codec->height = avs->height; + avs->st_video->codec->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 == NULL) + return AVERROR(ENOMEM); + avs->st_audio->codec->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("AVS"), + .priv_data_size = sizeof(AvsFormat), + .read_probe = avs_probe, + .read_header = avs_read_header, + .read_packet = avs_read_packet, + .read_close = avs_read_close, +}; 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