From 70daeacd6ef8b354dd7d2d77ad393831a5bbf033 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Fri, 21 Mar 2014 16:28:47 +0000 Subject: PAF demuxer and decoder Signed-off-by: Vittorio Giovara Signed-off-by: Luca Barbato --- libavformat/paf.c | 267 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 267 insertions(+) create mode 100644 libavformat/paf.c (limited to 'libavformat/paf.c') diff --git a/libavformat/paf.c b/libavformat/paf.c new file mode 100644 index 0000000..18bf353 --- /dev/null +++ b/libavformat/paf.c @@ -0,0 +1,267 @@ +/* + * Packed Animation File demuxer + * Copyright (c) 2012 Paul B Mahol + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/channel_layout.h" + +#include "avformat.h" +#include "internal.h" + +#define MAGIC "Packed Animation File V1.0\n(c) 1992-96 Amazing Studio\x0a\x1a" +#define PAF_SOUND_SAMPLES 2205 +#define PAF_SOUND_FRAME_SIZE ((256 + PAF_SOUND_SAMPLES) * 2) + +typedef struct { + uint32_t buffer_size; + uint32_t frame_blks; + uint32_t nb_frames; + uint32_t start_offset; + uint32_t preload_count; + uint32_t max_video_blks; + uint32_t max_audio_blks; + + uint32_t current_frame; + uint32_t current_frame_count; + uint32_t current_frame_block; + + uint32_t *blocks_count_table; + uint32_t *frames_offset_table; + uint32_t *blocks_offset_table; + + uint8_t *video_frame; + int video_size; + + uint8_t *audio_frame; + uint8_t *temp_audio_frame; + int audio_size; + + int got_audio; +} PAFDemuxContext; + +static int read_probe(AVProbeData *p) +{ + if ((p->buf_size >= strlen(MAGIC)) && + !memcmp(p->buf, MAGIC, strlen(MAGIC))) + return AVPROBE_SCORE_MAX; + return 0; +} + +static int read_close(AVFormatContext *s) +{ + PAFDemuxContext *p = s->priv_data; + + av_freep(&p->blocks_count_table); + av_freep(&p->frames_offset_table); + av_freep(&p->blocks_offset_table); + av_freep(&p->video_frame); + av_freep(&p->audio_frame); + av_freep(&p->temp_audio_frame); + + return 0; +} + +static void read_table(AVFormatContext *s, uint32_t *table, uint32_t count) +{ + int i; + + for (i = 0; i < count; i++) + table[i] = avio_rl32(s->pb); + + avio_skip(s->pb, 4 * (FFALIGN(count, 512) - count)); +} + +static int read_header(AVFormatContext *s) +{ + PAFDemuxContext *p = s->priv_data; + AVIOContext *pb = s->pb; + AVStream *ast, *vst; + int ret = 0; + + avio_skip(pb, 132); + + vst = avformat_new_stream(s, 0); + if (!vst) + return AVERROR(ENOMEM); + + vst->start_time = 0; + vst->nb_frames = + vst->duration = + p->nb_frames = avio_rl32(pb); + avio_skip(pb, 4); + + vst->codec->width = avio_rl32(pb); + vst->codec->height = avio_rl32(pb); + avio_skip(pb, 4); + + vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; + vst->codec->codec_tag = 0; + vst->codec->codec_id = AV_CODEC_ID_PAF_VIDEO; + avpriv_set_pts_info(vst, 64, 1, 10); + + ast = avformat_new_stream(s, 0); + if (!ast) + return AVERROR(ENOMEM); + + ast->start_time = 0; + ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; + ast->codec->codec_tag = 0; + ast->codec->codec_id = AV_CODEC_ID_PAF_AUDIO; + ast->codec->channels = 2; + ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; + ast->codec->sample_rate = 22050; + avpriv_set_pts_info(ast, 64, 1, 22050); + + p->buffer_size = avio_rl32(pb); + p->preload_count = avio_rl32(pb); + p->frame_blks = avio_rl32(pb); + p->start_offset = avio_rl32(pb); + p->max_video_blks = avio_rl32(pb); + p->max_audio_blks = avio_rl32(pb); + if (p->buffer_size < 175 || + p->max_audio_blks < 2 || + p->max_video_blks < 1 || + p->frame_blks < 1 || + p->nb_frames < 1 || + p->preload_count < 1 || + p->buffer_size > 2048 || + p->max_video_blks > 2048 || + p->max_audio_blks > 2048 || + p->nb_frames > INT_MAX / sizeof(uint32_t) || + p->frame_blks > INT_MAX / sizeof(uint32_t)) + return AVERROR_INVALIDDATA; + + p->blocks_count_table = av_mallocz(p->nb_frames * + sizeof(*p->blocks_count_table)); + p->frames_offset_table = av_mallocz(p->nb_frames * + sizeof(*p->frames_offset_table)); + p->blocks_offset_table = av_mallocz(p->frame_blks * + sizeof(*p->blocks_offset_table)); + + p->video_size = p->max_video_blks * p->buffer_size; + p->video_frame = av_mallocz(p->video_size); + + p->audio_size = p->max_audio_blks * p->buffer_size; + p->audio_frame = av_mallocz(p->audio_size); + p->temp_audio_frame = av_mallocz(p->audio_size); + + if (!p->blocks_count_table || + !p->frames_offset_table || + !p->blocks_offset_table || + !p->video_frame || + !p->audio_frame || + !p->temp_audio_frame) { + ret = AVERROR(ENOMEM); + goto fail; + } + + avio_seek(pb, p->buffer_size, SEEK_SET); + + read_table(s, p->blocks_count_table, p->nb_frames); + read_table(s, p->frames_offset_table, p->nb_frames); + read_table(s, p->blocks_offset_table, p->frame_blks); + + p->got_audio = 0; + p->current_frame = 0; + p->current_frame_block = 0; + + avio_seek(pb, p->start_offset, SEEK_SET); + + return 0; + +fail: + read_close(s); + + return ret; +} + +static int read_packet(AVFormatContext *s, AVPacket *pkt) +{ + PAFDemuxContext *p = s->priv_data; + AVIOContext *pb = s->pb; + uint32_t count, offset; + int size, i; + + if (p->current_frame >= p->nb_frames || pb->eof_reached) + return AVERROR_EOF; + + if (p->got_audio) { + if (av_new_packet(pkt, p->audio_size) < 0) + return AVERROR(ENOMEM); + + memcpy(pkt->data, p->temp_audio_frame, p->audio_size); + pkt->duration = PAF_SOUND_SAMPLES * (p->audio_size / PAF_SOUND_FRAME_SIZE); + pkt->flags |= AV_PKT_FLAG_KEY; + pkt->stream_index = 1; + p->got_audio = 0; + return pkt->size; + } + + count = (p->current_frame == 0) ? p->preload_count + : p->blocks_count_table[p->current_frame - 1]; + for (i = 0; i < count; i++) { + if (p->current_frame_block >= p->frame_blks) + return AVERROR_INVALIDDATA; + + offset = p->blocks_offset_table[p->current_frame_block] & ~(1U << 31); + if (p->blocks_offset_table[p->current_frame_block] & (1U << 31)) { + if (offset > p->audio_size - p->buffer_size) + return AVERROR_INVALIDDATA; + + avio_read(pb, p->audio_frame + offset, p->buffer_size); + if (offset == (p->max_audio_blks - 2) * p->buffer_size) { + memcpy(p->temp_audio_frame, p->audio_frame, p->audio_size); + p->got_audio = 1; + } + } else { + if (offset > p->video_size - p->buffer_size) + return AVERROR_INVALIDDATA; + + avio_read(pb, p->video_frame + offset, p->buffer_size); + } + p->current_frame_block++; + } + + if (p->frames_offset_table[p->current_frame] >= p->video_size) + return AVERROR_INVALIDDATA; + + size = p->video_size - p->frames_offset_table[p->current_frame]; + + if (av_new_packet(pkt, size) < 0) + return AVERROR(ENOMEM); + + pkt->stream_index = 0; + pkt->duration = 1; + memcpy(pkt->data, p->video_frame + p->frames_offset_table[p->current_frame], size); + if (pkt->data[0] & 0x20) + pkt->flags |= AV_PKT_FLAG_KEY; + p->current_frame++; + + return pkt->size; +} + +AVInputFormat ff_paf_demuxer = { + .name = "paf", + .long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File"), + .priv_data_size = sizeof(PAFDemuxContext), + .read_probe = read_probe, + .read_header = read_header, + .read_packet = read_packet, + .read_close = read_close, +}; 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