mirror of
https://github.com/FFmpeg/FFmpeg.git
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273 lines
8.7 KiB
C
273 lines
8.7 KiB
C
/*
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* CDXL demuxer
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* Copyright (c) 2011-2012 Paul B Mahol
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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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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "internal.h"
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#define CDXL_HEADER_SIZE 32
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typedef struct CDXLDemuxContext {
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AVClass *class;
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int read_chunk;
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AVRational frate;
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int srate;
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AVRational frame_rate;
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int sample_rate;
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uint8_t header[CDXL_HEADER_SIZE];
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int video_stream_index;
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int audio_stream_index;
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int64_t filesize;
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int64_t pos;
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} CDXLDemuxContext;
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static int cdxl_read_probe(const AVProbeData *p)
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{
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int score = AVPROBE_SCORE_EXTENSION + 10;
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const uint8_t *buf = p->buf;
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if (p->buf_size < CDXL_HEADER_SIZE)
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return 0;
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/* check type */
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if (buf[0] > 1)
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return 0;
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/* reserved bytes should always be set to 0 */
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if (AV_RL24(&buf[29]))
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return 0;
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/* check palette size */
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if (!AV_RN16(&buf[20]))
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return 0;
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if (buf[0] == 1 && AV_RB16(&buf[20]) > 512)
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return 0;
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if (buf[0] == 0 && AV_RB16(&buf[20]) > 768)
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return 0;
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if (!AV_RN16(&buf[22]) && AV_RN16(&buf[24]))
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return 0;
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if (buf[0] == 0 && (!buf[26] || !AV_RB16(&buf[24])))
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return 0;
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/* check number of planes */
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if (buf[19] != 6 && buf[19] != 8 && buf[19] != 24)
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return 0;
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if (buf[18])
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return 0;
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/* check widh and height */
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if (AV_RB16(&buf[14]) > 640 || AV_RB16(&buf[16]) > 480 ||
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AV_RB16(&buf[14]) == 0 || AV_RB16(&buf[16]) == 0)
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return 0;
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/* chunk size */
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if (AV_RB32(&buf[2]) <= AV_RB16(&buf[20]) + AV_RB16(&buf[22]) * (1 + !!(buf[1] & 0x10)) + CDXL_HEADER_SIZE)
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return 0;
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/* previous chunk size */
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if (AV_RN32(&buf[6]))
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score /= 2;
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/* current frame number, usually starts from 1 */
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if (AV_RB32(&buf[10]) != 1)
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score /= 2;
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return score;
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}
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static int cdxl_read_header(AVFormatContext *s)
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{
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CDXLDemuxContext *cdxl = s->priv_data;
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cdxl->read_chunk = 0;
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cdxl->video_stream_index = -1;
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cdxl->audio_stream_index = -1;
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cdxl->filesize = avio_size(s->pb);
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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return 0;
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}
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static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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CDXLDemuxContext *cdxl = s->priv_data;
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AVIOContext *pb = s->pb;
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uint32_t current_size, video_size, image_size;
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uint16_t audio_size, palette_size, width, height;
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int channels, type, format, ret;
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if (avio_feof(pb))
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return AVERROR_EOF;
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if (!cdxl->read_chunk) {
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cdxl->pos = avio_tell(pb);
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if (avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE)
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return AVERROR_EOF;
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}
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if (cdxl->header[0] > 1) {
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av_log(s, AV_LOG_ERROR, "unsupported cdxl file\n");
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return AVERROR_INVALIDDATA;
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}
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type = cdxl->header[0];
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channels = 1 + !!(cdxl->header[1] & 0x10);
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format = cdxl->header[1] & 0xE0;
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current_size = AV_RB32(&cdxl->header[2]);
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width = AV_RB16(&cdxl->header[14]);
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height = AV_RB16(&cdxl->header[16]);
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palette_size = AV_RB16(&cdxl->header[20]);
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audio_size = AV_RB16(&cdxl->header[22]) * channels;
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cdxl->srate = AV_RB16(&cdxl->header[24]);
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if (!cdxl->srate && audio_size)
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cdxl->srate = cdxl->sample_rate;
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cdxl->frate.num = cdxl->header[26];
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cdxl->frate.den = 1;
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if (cdxl->header[19] == 0 ||
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FFALIGN(width, 16) * (uint64_t)height * cdxl->header[19] > INT_MAX)
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return AVERROR_INVALIDDATA;
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if (format == 0x20)
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image_size = width * height * cdxl->header[19] / 8;
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else
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image_size = FFALIGN(width, 16) * height * cdxl->header[19] / 8;
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video_size = palette_size + image_size;
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if ((type == 1 && palette_size > 512) ||
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(type == 0 && palette_size > 768))
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return AVERROR_INVALIDDATA;
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if (current_size < (uint64_t)audio_size + video_size + CDXL_HEADER_SIZE)
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return AVERROR_INVALIDDATA;
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if (!cdxl->frate.num && audio_size && cdxl->srate > 0) {
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cdxl->frate = (AVRational){ cdxl->srate, audio_size };
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} else if (!cdxl->frate.num) {
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cdxl->frate = cdxl->frame_rate;
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}
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if (cdxl->read_chunk && audio_size) {
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if (cdxl->audio_stream_index == -1) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_tag = 0;
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
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st->codecpar->channels = channels;
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st->codecpar->channel_layout = channels == 2 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
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st->codecpar->sample_rate= cdxl->srate;
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st->start_time = 0;
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cdxl->audio_stream_index = st->index;
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avpriv_set_pts_info(st, 64, 1, cdxl->srate);
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if (current_size && cdxl->filesize > 0 && audio_size > 0)
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st->duration = (cdxl->filesize / current_size) * audio_size / channels;
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}
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ret = av_get_packet(pb, pkt, audio_size);
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if (ret < 0)
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return ret;
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pkt->stream_index = cdxl->audio_stream_index;
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pkt->pos = cdxl->pos;
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pkt->duration = audio_size / channels;
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cdxl->read_chunk = 0;
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} else {
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if (cdxl->video_stream_index == -1) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_tag = 0;
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st->codecpar->codec_id = AV_CODEC_ID_CDXL;
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st->codecpar->width = width;
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st->codecpar->height = height;
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if (current_size && cdxl->filesize > 0)
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st->nb_frames = cdxl->filesize / current_size;
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st->start_time = 0;
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cdxl->video_stream_index = st->index;
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avpriv_set_pts_info(st, 64, cdxl->frate.den, cdxl->frate.num);
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}
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if ((ret = av_new_packet(pkt, video_size + CDXL_HEADER_SIZE)) < 0)
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return ret;
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memcpy(pkt->data, cdxl->header, CDXL_HEADER_SIZE);
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ret = avio_read(pb, pkt->data + CDXL_HEADER_SIZE, video_size);
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if (ret < 0) {
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return ret;
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}
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av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret);
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pkt->stream_index = cdxl->video_stream_index;
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pkt->flags |= AV_PKT_FLAG_KEY;
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pkt->pos = cdxl->pos;
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pkt->duration = 1;
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cdxl->read_chunk = audio_size;
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}
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if (!cdxl->read_chunk)
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avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE);
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return ret;
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}
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static int read_seek(AVFormatContext *s, int stream_index,
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int64_t timestamp, int flags)
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{
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CDXLDemuxContext *cdxl = s->priv_data;
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cdxl->read_chunk = 0;
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return -1;
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}
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#define OFFSET(x) offsetof(CDXLDemuxContext, x)
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static const AVOption cdxl_options[] = {
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{ "sample_rate", "", OFFSET(sample_rate), AV_OPT_TYPE_INT, { .i64=11025 }, 8000, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
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{ "frame_rate", "", OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, { .str="15" }, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
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{ NULL },
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};
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static const AVClass cdxl_demuxer_class = {
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.class_name = "CDXL demuxer",
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.item_name = av_default_item_name,
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.option = cdxl_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_cdxl_demuxer = {
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.name = "cdxl",
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.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
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.priv_data_size = sizeof(CDXLDemuxContext),
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.priv_class = &cdxl_demuxer_class,
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.read_probe = cdxl_read_probe,
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.read_header = cdxl_read_header,
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.read_packet = cdxl_read_packet,
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.read_seek = read_seek,
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.extensions = "cdxl,xl",
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.flags = AVFMT_GENERIC_INDEX,
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};
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