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ffmpeg / libavformat / r3d.c @ b7effd4e

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/*
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 * R3D REDCODE demuxer
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 * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
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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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//#define DEBUG
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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typedef struct {
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    unsigned video_offsets_count;
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    unsigned *video_offsets;
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    unsigned rdvo_offset;
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} R3DContext;
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typedef struct {
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    unsigned size;
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    uint32_t tag;
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    uint64_t offset;
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} Atom;
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static int read_atom(AVFormatContext *s, Atom *atom)
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{
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    atom->offset = url_ftell(s->pb);
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    atom->size = avio_rb32(s->pb);
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    if (atom->size < 8)
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        return -1;
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    atom->tag = avio_rl32(s->pb);
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    av_dlog(s, "atom %d %.4s offset %#llx\n",
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            atom->size, (char*)&atom->tag, atom->offset);
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    return atom->size;
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}
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static int r3d_read_red1(AVFormatContext *s)
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{
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    AVStream *st = av_new_stream(s, 0);
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    char filename[258];
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    int tmp, tmp2;
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    if (!st)
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        return AVERROR(ENOMEM);
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    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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    st->codec->codec_id = CODEC_ID_JPEG2000;
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    tmp  = avio_r8(s->pb); // major version
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    tmp2 = avio_r8(s->pb); // minor version
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    av_dlog(s, "version %d.%d\n", tmp, tmp2);
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    tmp = avio_rb16(s->pb); // unknown
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    av_dlog(s, "unknown1 %d\n", tmp);
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    tmp = avio_rb32(s->pb);
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    av_set_pts_info(st, 32, 1, tmp);
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    tmp = avio_rb32(s->pb); // filenum
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    av_dlog(s, "filenum %d\n", tmp);
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    url_fskip(s->pb, 32); // unknown
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    st->codec->width  = avio_rb32(s->pb);
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    st->codec->height = avio_rb32(s->pb);
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    tmp = avio_rb16(s->pb); // unknown
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    av_dlog(s, "unknown2 %d\n", tmp);
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    st->codec->time_base.den = avio_rb16(s->pb);
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    st->codec->time_base.num = avio_rb16(s->pb);
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    tmp = avio_r8(s->pb); // audio channels
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    av_dlog(s, "audio channels %d\n", tmp);
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    if (tmp > 0) {
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        AVStream *ast = av_new_stream(s, 1);
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        if (!ast)
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            return AVERROR(ENOMEM);
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        ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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        ast->codec->codec_id = CODEC_ID_PCM_S32BE;
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        ast->codec->channels = tmp;
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        av_set_pts_info(ast, 32, 1, st->time_base.den);
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    }
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    avio_read(s->pb, filename, 257);
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    filename[sizeof(filename)-1] = 0;
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    av_metadata_set2(&st->metadata, "filename", filename, 0);
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    av_dlog(s, "filename %s\n", filename);
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    av_dlog(s, "resolution %dx%d\n", st->codec->width, st->codec->height);
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    av_dlog(s, "timescale %d\n", st->time_base.den);
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    av_dlog(s, "frame rate %d/%d\n",
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            st->codec->time_base.num, st->codec->time_base.den);
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    return 0;
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}
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static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)
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{
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    R3DContext *r3d = s->priv_data;
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    AVStream *st = s->streams[0];
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    int i;
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    r3d->video_offsets_count = (atom->size - 8) / 4;
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    r3d->video_offsets = av_malloc(atom->size);
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    if (!r3d->video_offsets)
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        return AVERROR(ENOMEM);
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    for (i = 0; i < r3d->video_offsets_count; i++) {
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        r3d->video_offsets[i] = avio_rb32(s->pb);
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        if (!r3d->video_offsets[i]) {
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            r3d->video_offsets_count = i;
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            break;
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        }
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        av_dlog(s, "video offset %d: %#x\n", i, r3d->video_offsets[i]);
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    }
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    if (st->codec->time_base.den)
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        st->duration = (uint64_t)r3d->video_offsets_count*
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            st->time_base.den*st->codec->time_base.num/st->codec->time_base.den;
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    av_dlog(s, "duration %lld\n", st->duration);
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    return 0;
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}
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static void r3d_read_reos(AVFormatContext *s)
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{
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    R3DContext *r3d = s->priv_data;
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    int tmp;
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    r3d->rdvo_offset = avio_rb32(s->pb);
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    avio_rb32(s->pb); // rdvs offset
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    avio_rb32(s->pb); // rdao offset
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    avio_rb32(s->pb); // rdas offset
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    tmp = avio_rb32(s->pb);
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    av_dlog(s, "num video chunks %d\n", tmp);
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    tmp = avio_rb32(s->pb);
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    av_dlog(s, "num audio chunks %d\n", tmp);
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    url_fskip(s->pb, 6*4);
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}
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static int r3d_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    R3DContext *r3d = s->priv_data;
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    Atom atom;
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    int ret;
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    if (read_atom(s, &atom) < 0) {
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        av_log(s, AV_LOG_ERROR, "error reading atom\n");
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        return -1;
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    }
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    if (atom.tag == MKTAG('R','E','D','1')) {
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        if ((ret = r3d_read_red1(s)) < 0) {
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            av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");
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            return ret;
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        }
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    } else {
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        av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");
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        return -1;
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    }
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    s->data_offset = url_ftell(s->pb);
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    av_dlog(s, "data offset %#llx\n", s->data_offset);
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    if (url_is_streamed(s->pb))
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        return 0;
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    // find REOB/REOF/REOS to load index
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    url_fseek(s->pb, url_fsize(s->pb)-48-8, SEEK_SET);
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    if (read_atom(s, &atom) < 0)
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        av_log(s, AV_LOG_ERROR, "error reading end atom\n");
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    if (atom.tag != MKTAG('R','E','O','B') &&
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        atom.tag != MKTAG('R','E','O','F') &&
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        atom.tag != MKTAG('R','E','O','S'))
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        goto out;
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    r3d_read_reos(s);
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    if (r3d->rdvo_offset) {
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        url_fseek(s->pb, r3d->rdvo_offset, SEEK_SET);
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        if (read_atom(s, &atom) < 0)
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            av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");
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        if (atom.tag == MKTAG('R','D','V','O')) {
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            if (r3d_read_rdvo(s, &atom) < 0)
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                av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");
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        }
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    }
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 out:
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    url_fseek(s->pb, s->data_offset, SEEK_SET);
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    return 0;
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}
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static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)
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{
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    AVStream *st = s->streams[0];
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    int tmp, tmp2;
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    uint64_t pos = url_ftell(s->pb);
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    unsigned dts;
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    int ret;
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    dts = avio_rb32(s->pb);
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    tmp = avio_rb32(s->pb);
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    av_dlog(s, "frame num %d\n", tmp);
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    tmp  = avio_r8(s->pb); // major version
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    tmp2 = avio_r8(s->pb); // minor version
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    av_dlog(s, "version %d.%d\n", tmp, tmp2);
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    tmp = avio_rb16(s->pb); // unknown
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    av_dlog(s, "unknown %d\n", tmp);
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    if (tmp > 4) {
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        tmp = avio_rb16(s->pb); // unknown
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        av_dlog(s, "unknown %d\n", tmp);
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        tmp = avio_rb16(s->pb); // unknown
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        av_dlog(s, "unknown %d\n", tmp);
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        tmp = avio_rb32(s->pb);
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        av_dlog(s, "width %d\n", tmp);
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        tmp = avio_rb32(s->pb);
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        av_dlog(s, "height %d\n", tmp);
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        tmp = avio_rb32(s->pb);
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        av_dlog(s, "metadata len %d\n", tmp);
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    }
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    tmp = atom->size - 8 - (url_ftell(s->pb) - pos);
245
    if (tmp < 0)
246
        return -1;
247
    ret = av_get_packet(s->pb, pkt, tmp);
248
    if (ret < 0) {
249
        av_log(s, AV_LOG_ERROR, "error reading video packet\n");
250
        return -1;
251
    }
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253
    pkt->stream_index = 0;
254
    pkt->dts = dts;
255
    if (st->codec->time_base.den)
256
        pkt->duration = (uint64_t)st->time_base.den*
257
            st->codec->time_base.num/st->codec->time_base.den;
258
    av_dlog(s, "pkt dts %lld duration %d\n", pkt->dts, pkt->duration);
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260
    return 0;
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}
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static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)
264
{
265
    AVStream *st = s->streams[1];
266
    int tmp, tmp2, samples, size;
267
    uint64_t pos = url_ftell(s->pb);
268
    unsigned dts;
269
    int ret;
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271
    dts = avio_rb32(s->pb);
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    st->codec->sample_rate = avio_rb32(s->pb);
274

    
275
    samples = avio_rb32(s->pb);
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277
    tmp = avio_rb32(s->pb);
278
    av_dlog(s, "packet num %d\n", tmp);
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    tmp = avio_rb16(s->pb); // unkown
281
    av_dlog(s, "unknown %d\n", tmp);
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283
    tmp  = avio_r8(s->pb); // major version
284
    tmp2 = avio_r8(s->pb); // minor version
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    av_dlog(s, "version %d.%d\n", tmp, tmp2);
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287
    tmp = avio_rb32(s->pb); // unknown
288
    av_dlog(s, "unknown %d\n", tmp);
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290
    size = atom->size - 8 - (url_ftell(s->pb) - pos);
291
    if (size < 0)
292
        return -1;
293
    ret = av_get_packet(s->pb, pkt, size);
294
    if (ret < 0) {
295
        av_log(s, AV_LOG_ERROR, "error reading audio packet\n");
296
        return ret;
297
    }
298

    
299
    pkt->stream_index = 1;
300
    pkt->dts = dts;
301
    pkt->duration = av_rescale(samples, st->time_base.den, st->codec->sample_rate);
302
    av_dlog(s, "pkt dts %lld duration %d samples %d sample rate %d\n",
303
            pkt->dts, pkt->duration, samples, st->codec->sample_rate);
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305
    return 0;
306
}
307

    
308
static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)
309
{
310
    Atom atom;
311
    int err = 0;
312

    
313
    while (!err) {
314
        if (read_atom(s, &atom) < 0) {
315
            err = -1;
316
            break;
317
        }
318
        switch (atom.tag) {
319
        case MKTAG('R','E','D','V'):
320
            if (s->streams[0]->discard == AVDISCARD_ALL)
321
                goto skip;
322
            if (!(err = r3d_read_redv(s, pkt, &atom)))
323
                return 0;
324
            break;
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        case MKTAG('R','E','D','A'):
326
            if (s->nb_streams < 2)
327
                return -1;
328
            if (s->streams[1]->discard == AVDISCARD_ALL)
329
                goto skip;
330
            if (!(err = r3d_read_reda(s, pkt, &atom)))
331
                return 0;
332
            break;
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        default:
334
        skip:
335
            url_fskip(s->pb, atom.size-8);
336
        }
337
    }
338
    return err;
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}
340

    
341
static int r3d_probe(AVProbeData *p)
342
{
343
    if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))
344
        return AVPROBE_SCORE_MAX;
345
    return 0;
346
}
347

    
348
static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
349
{
350
    AVStream *st = s->streams[0]; // video stream
351
    R3DContext *r3d = s->priv_data;
352
    int frame_num;
353

    
354
    if (!st->codec->time_base.num || !st->time_base.den)
355
        return -1;
356

    
357
    frame_num = sample_time*st->codec->time_base.den/
358
        ((int64_t)st->codec->time_base.num*st->time_base.den);
359
    av_dlog(s, "seek frame num %d timestamp %lld\n", frame_num, sample_time);
360

    
361
    if (frame_num < r3d->video_offsets_count) {
362
        url_fseek(s->pb, r3d->video_offsets_count, SEEK_SET);
363
    } else {
364
        av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);
365
        return -1;
366
    }
367

    
368
    return 0;
369
}
370

    
371
static int r3d_close(AVFormatContext *s)
372
{
373
    R3DContext *r3d = s->priv_data;
374

    
375
    av_freep(&r3d->video_offsets);
376

    
377
    return 0;
378
}
379

    
380
AVInputFormat ff_r3d_demuxer = {
381
    "r3d",
382
    NULL_IF_CONFIG_SMALL("REDCODE R3D format"),
383
    sizeof(R3DContext),
384
    r3d_probe,
385
    r3d_read_header,
386
    r3d_read_packet,
387
    r3d_close,
388
    r3d_seek,
389
};